Pub Date : 2025-12-01DOI: 10.1016/j.mtsust.2025.101262
Hamid Reza Azizi, Seyedeh Hosna Talebian, Sara Masoumi
On the path to achieving the net-zero carbon targets while meeting growing global energy demand, the development of efficient CO2 capture strategies is crucial for a smoother transition to a low-carbon economy. Among existing capture technologies, Rapid Temperature Swing Adsorption (RTSA) has emerged as a promising alternative to conventional solvent-based processes, reducing regeneration energy penalties. In particular, polymeric hollow fiber modules have attracted significant attention as advanced RTSA platforms, owning to their high surface area-to-volume ratio, efficient thermal management, and lower pressure drops compared to traditional packed-bed systems. This review comprehensively examines recent advancements in hollow fiber-based RTSA for CO2capture, focusing on technological developments, polymeric structures, novel adsorbents, and innovative module designs. Special attention is given to the effects of impurity gases, adsorbent stability, and the optimization of hollow fiber configurations to enhance overall performance. The review also emphasizes HF-RTSA's potential to deliver cost-effective and energy-efficient CO2 capture solutions at industrial scale.
{"title":"A critical review of new advancements in HF-RTSA CO2 capture","authors":"Hamid Reza Azizi, Seyedeh Hosna Talebian, Sara Masoumi","doi":"10.1016/j.mtsust.2025.101262","DOIUrl":"10.1016/j.mtsust.2025.101262","url":null,"abstract":"<div><div>On the path to achieving the net-zero carbon targets while meeting growing global energy demand, the development of efficient CO<sub>2</sub> capture strategies is crucial for a smoother transition to a low-carbon economy. Among existing capture technologies, Rapid Temperature Swing Adsorption (RTSA) has emerged as a promising alternative to conventional solvent-based processes, reducing regeneration energy penalties. In particular, polymeric hollow fiber modules have attracted significant attention as advanced RTSA platforms, owning to their high surface area-to-volume ratio, efficient thermal management, and lower pressure drops compared to traditional packed-bed systems. This review comprehensively examines recent advancements in hollow fiber-based RTSA for CO<sub>2</sub>capture, focusing on technological developments, polymeric structures, novel adsorbents, and innovative module designs. Special attention is given to the effects of impurity gases, adsorbent stability, and the optimization of hollow fiber configurations to enhance overall performance. The review also emphasizes HF-RTSA's potential to deliver cost-effective and energy-efficient CO<sub>2</sub> capture solutions at industrial scale.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"32 ","pages":"Article 101262"},"PeriodicalIF":7.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.mtsust.2025.101258
Jumaa A. Aseeri , Mabrook S. Amer , Kuo-Wei Huang , Abdullah M. Al-Mayouf
Materials with ordered mesopores are attracting considerable interest due to their extraordinary efficacy in energy storage and conversion systems, particularly in electrocatalysis, which can be attributed to their extensive surface areas and adjustable porosity. Here, we present a rational design and synthesis of a novel ordered mesoporous SnO2 (OMS-SnO2) electrocatalyst utilizing the soft-template sol-gel method using Pluronic F127 as a structure-directing agent and trimethylbenzene (TMB) as a chelating agent. The OMS-SnO2 produced has a remarkably high surface area of 230.84 m2/g, with uniform mesopores averaging 4.17 nm and a significant density of oxygen vacancies. Using a gas-fed flow cell setup, OMS-SnO2 shows exceptional selectivity for formate synthesis and electrocatalytic activity. With an applied potential of −1.2 V vs. RHE, the catalyst exhibits outstanding intrinsic activity, achieving a high partial current density of −119.40 mA cm−3 for formate. Moreover, at – 0.8 V vs. RHE, it achieves an impressive Faradaic efficiency (FE) of 91.66 % for formate, indicating highly selective two-electron reduction of CO2. The system achieves a rate of formate of 1392.71 mg L−1h1, among the highest reported under similar reaction conditions, while maintaining a high cathodic energy efficiency (CEE) of 64.57 % and TOF (∼1600 h−1). These results underscore the crucial role of mesoporosity and defect engineering in boosting CO2 electroreduction performance.
具有有序介孔的材料由于其在能量存储和转换系统，特别是电催化方面的非凡功效而引起了人们的极大兴趣，这可归因于其广泛的表面积和可调节的孔隙率。本文以Pluronic F127为结构导向剂，三甲基苯（TMB）为螯合剂，采用软模板溶胶-凝胶法，合理设计和合成了一种新型有序介孔SnO2 （OMS-SnO2）电催化剂。制备的OMS-SnO2具有230.84 m2/g的高表面积，均匀的介孔平均为4.17 nm，氧空位密度显著。使用气供流动电池装置，OMS-SnO2表现出优异的甲酸合成选择性和电催化活性。该催化剂的应用电位为- 1.2 V vs. RHE，表现出出色的本禀活性，甲酸酯的分电流密度为- 119.40 mA cm−3。此外，在- 0.8 V vs. RHE下，它对甲酸酯的法拉第效率（FE）达到了令人印象深刻的91.66 %，表明CO2具有高选择性的双电子还原。该体系的甲酸速率为1392.71 mg L−1h1，是类似反应条件下报道的最高速率之一，同时保持了64.57 %的高阴极能量效率（CEE）和约1600 h−1的TOF。这些结果强调了介孔和缺陷工程在提高CO2电还原性能中的关键作用。
{"title":"Soft-template synthesis of oxygen vacancy-rich mesoporous SnO2 for efficient CO2 electroreduction to formate","authors":"Jumaa A. Aseeri , Mabrook S. Amer , Kuo-Wei Huang , Abdullah M. Al-Mayouf","doi":"10.1016/j.mtsust.2025.101258","DOIUrl":"10.1016/j.mtsust.2025.101258","url":null,"abstract":"<div><div>Materials with ordered mesopores are attracting considerable interest due to their extraordinary efficacy in energy storage and conversion systems, particularly in electrocatalysis, which can be attributed to their extensive surface areas and adjustable porosity. Here, we present a rational design and synthesis of a novel ordered mesoporous SnO<sub>2</sub> (OMS-SnO<sub>2</sub>) electrocatalyst utilizing the soft-template sol-gel method using Pluronic F127 as a structure-directing agent and trimethylbenzene (TMB) as a chelating agent. The OMS-SnO<sub>2</sub> produced has a remarkably high surface area of 230.84 m<sup>2</sup>/g, with uniform mesopores averaging 4.17 nm and a significant density of oxygen vacancies. Using a gas-fed flow cell setup, OMS-SnO<sub>2</sub> shows exceptional selectivity for formate synthesis and electrocatalytic activity. With an applied potential of −1.2 V vs. RHE, the catalyst exhibits outstanding intrinsic activity, achieving a high partial current density of −119.40 mA cm<sup>−3</sup> for formate. Moreover, at – 0.8 V vs. RHE, it achieves an impressive Faradaic efficiency (FE) of 91.66 % for formate, indicating highly selective two-electron reduction of CO<sub>2</sub>. The system achieves a rate of formate of 1392.71 mg L<sup>−1</sup>h<sup>1</sup>, among the highest reported under similar reaction conditions, while maintaining a high cathodic energy efficiency (CEE) of 64.57 % and TOF (∼1600 h<sup>−1</sup>). These results underscore the crucial role of mesoporosity and defect engineering in boosting CO<sub>2</sub> electroreduction performance.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"32 ","pages":"Article 101258"},"PeriodicalIF":7.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145619934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.mtsust.2025.101266
Ahmad Reshad Delawary , Fahanwi Asabuwa Ngwabebhoh , Viera Pechancova , Tomas Saha , Petr Saha
The textile and footwear industries generate over 1.2 million tons of chromium-tanned leather waste annually, posing severe environmental and health risks due to the presence of toxic Cr(III) and Cr(VI) compounds. This review critically evaluates current treatment technologies and valorization strategies for repurposing this waste into high-performance energy materials. Although leather waste contains up to 50–60 % organic content and 3–5 % chromium, its potential as a carbon-rich precursor remains underexplored. This review is the first to comprehensively address its application in energy systems, with a focus on electrochemical performance, specific surface area (ranging from 300 to 1200 m2/g in modified carbonized materials), and environmental impact mitigation. Promising approaches include hybridization with carbonized biomass, metal oxides, and conductive polymers, resulting in materials suitable for supercapacitors, batteries, fuel, and solar cells. Life-cycle assessment (LCA) studies show up to 30 % reduction in environmental footprint compared to conventional synthetic materials. Despite these advances, challenges remain in scaling laboratory successes to industrial production. The review concludes that while significant strides have been made, further research is needed to optimize material properties, improve process economics, and fully integrate LCA into development pipelines to support sustainable, large-scale implementation of leather waste-derived energy materials.
{"title":"Treatment and utilization of chromium-tanned leather waste for energy materials as an alternative approach to current energy technologies: a review","authors":"Ahmad Reshad Delawary , Fahanwi Asabuwa Ngwabebhoh , Viera Pechancova , Tomas Saha , Petr Saha","doi":"10.1016/j.mtsust.2025.101266","DOIUrl":"10.1016/j.mtsust.2025.101266","url":null,"abstract":"<div><div>The textile and footwear industries generate over 1.2 million tons of chromium-tanned leather waste annually, posing severe environmental and health risks due to the presence of toxic Cr(III) and Cr(VI) compounds. This review critically evaluates current treatment technologies and valorization strategies for repurposing this waste into high-performance energy materials. Although leather waste contains up to 50–60 % organic content and 3–5 % chromium, its potential as a carbon-rich precursor remains underexplored. This review is the first to comprehensively address its application in energy systems, with a focus on electrochemical performance, specific surface area (ranging from 300 to 1200 m<sup>2</sup>/g in modified carbonized materials), and environmental impact mitigation. Promising approaches include hybridization with carbonized biomass, metal oxides, and conductive polymers, resulting in materials suitable for supercapacitors, batteries, fuel, and solar cells. Life-cycle assessment (LCA) studies show up to 30 % reduction in environmental footprint compared to conventional synthetic materials. Despite these advances, challenges remain in scaling laboratory successes to industrial production. The review concludes that while significant strides have been made, further research is needed to optimize material properties, improve process economics, and fully integrate LCA into development pipelines to support sustainable, large-scale implementation of leather waste-derived energy materials.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"32 ","pages":"Article 101266"},"PeriodicalIF":7.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.mtsust.2025.101255
Hao Cheng , Hongyan Du , Chuanping Liu , Kefu Zhang , Fenghua Ba
Phosphorus is essential for crop growth and energy transfer in plants. However, its excessive use leads to water pollution, making the effective removal and recovery of phosphate critically important. To optimize phosphate adsorption efficiency and enable resource utilization, this study synthesized a zirconium (Zr)-modified calcium silicate hydrate (CSH) adsorbent using fly ash as the raw material through a hydrothermal method. The interlayer-rich hydrated Ca2+ in CSH facilitates rapid adsorption via ion exchange, while Zr doping enhances the selectivity and reusability of phosphate adsorption. The maximum adsorption capacity reached 49.83 mg P/g under optimal adsorption conditions at a Zr:Ca molar ratio of 1.25, with an adsorption rate exceeding 99 %. Furthermore, the adsorption mechanism was elucidated through kinetic, isotherm, and thermodynamic analyses, mainly containing ligand exchange between layers and electrostatic interactions. This study not only advances green chemistry in pollution control and resource conservation but also provides innovative insights for the development of environmental industries within the context of carbon neutrality. It offers a novel approach for designing phosphate adsorbents and promotes sustainable practices in environmental management.
{"title":"Highly efficient removal of phosphate by mesoporous Zr-modified calcium silicate hydrate from fly ash","authors":"Hao Cheng , Hongyan Du , Chuanping Liu , Kefu Zhang , Fenghua Ba","doi":"10.1016/j.mtsust.2025.101255","DOIUrl":"10.1016/j.mtsust.2025.101255","url":null,"abstract":"<div><div>Phosphorus is essential for crop growth and energy transfer in plants. However, its excessive use leads to water pollution, making the effective removal and recovery of phosphate critically important. To optimize phosphate adsorption efficiency and enable resource utilization, this study synthesized a zirconium (Zr)-modified calcium silicate hydrate (CSH) adsorbent using fly ash as the raw material through a hydrothermal method. The interlayer-rich hydrated Ca<sup>2+</sup> in CSH facilitates rapid adsorption via ion exchange, while Zr doping enhances the selectivity and reusability of phosphate adsorption. The maximum adsorption capacity reached 49.83 mg P/g under optimal adsorption conditions at a Zr:Ca molar ratio of 1.25, with an adsorption rate exceeding 99 %. Furthermore, the adsorption mechanism was elucidated through kinetic, isotherm, and thermodynamic analyses, mainly containing ligand exchange between layers and electrostatic interactions. This study not only advances green chemistry in pollution control and resource conservation but also provides innovative insights for the development of environmental industries within the context of carbon neutrality. It offers a novel approach for designing phosphate adsorbents and promotes sustainable practices in environmental management.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"32 ","pages":"Article 101255"},"PeriodicalIF":7.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.mtsust.2025.101261
Nourman Barakat , Lukas Fischer
Catalytic membranes with leaching-resistant noble metals offer promise for continuous oxidative water purification, but their adoption is hampered by inefficient catalyst utilization and poorly understood reaction mechanisms. Here, we present the in situ synthesis of entangled particle-polymer complexes within the casting solution to fabricate polyethersulfone membranes with pore-confined ultrasmall noble metal nanoparticles. This all-in-one approach maximizes catalyst utilization by achieving pore surface confinement of nanoparticles in near-quantitative yields. By combining thermodynamic, kinetic, and radical probe analyses, we reveal the catalytic mechanisms of pore-confined Ag, Au, Ru, and Pd in degrading ofloxacin via peroxymonosulfate (PMS) activation in a realistic water matrix. We further introduce a novel mechanistic model for catalytic pollutant remediation in complex environments, providing a fundamental advance for rational catalyst design. Going beyond conventional models, our model integrates several key catalyst parameters into a single quantitative rate equation: thermodynamic reactivity of active species, catalytic rate constant, PMS affinity, and interference by water matrix components. Furthermore, a unique dual radical/non-radical PMS activation pathway was identified for pore-confined Pd, promoting a catalytic turnover frequency an order of magnitude higher than those of catalytic membranes reported in the literature. The Pd-decorated membrane also drastically outperformed comparable systems for continuous water treatment under environmentally-relevant conditions: it achieved complete flow-through degradation (1.2 s residence time) of 10 μg L−1 ofloxacin in an ionic matrix at neutral pH to below the predicted no-effect concentration (<26 ng L−1), maintaining this single-pass removal over 80 h (28 000 L m−2 volume) flow operation without any metal leaching.
含有抗浸出贵金属的催化膜为连续氧化水净化提供了希望，但由于催化剂利用效率低下和对反应机理的了解不足，其应用受到阻碍。在这里，我们提出了在铸造溶液中原位合成纠缠粒子-聚合物配合物，以制造具有孔限制的超小贵金属纳米颗粒的聚醚砜膜。这种一体化的方法通过实现纳米颗粒的孔表面限制，以接近定量的产量最大化催化剂的利用率。通过结合热力学、动力学和自由基探针分析，我们揭示了孔隙限制的Ag、Au、Ru和Pd在现实水基质中通过过氧单硫酸盐（PMS）活化降解氧氟沙星的催化机理。我们进一步介绍了复杂环境下催化污染物修复的一种新的机制模型，为合理设计催化剂提供了基础。超越传统模型，我们的模型将几个关键的催化剂参数集成到一个单一的定量速率方程中：活性物质的热力学反应性、催化速率常数、PMS亲和性和水基质组分的干扰。此外，我们还发现了一种独特的双自由基/非自由基PMS激活途径，使孔限制Pd的催化转换频率比文献报道的催化膜高一个数量级。Pd-decorated膜也大大优于同类environmentally-relevant条件下连续水处理系统:它实现完整的材料退化(1.2 停留时间)10 μg L−1氧氟沙星在离子矩阵在中性pH值低于预测浓度没有影响(& lt; 26 ng L−1),维持这种单程删除超过80 h(28 000 L m−2卷)流操作没有任何金属浸出。
{"title":"Catalytic membranes with integrated pore-confinement of ultrasmall noble metal nanoparticles: Realizing pollutant degradation in complex water matrices","authors":"Nourman Barakat , Lukas Fischer","doi":"10.1016/j.mtsust.2025.101261","DOIUrl":"10.1016/j.mtsust.2025.101261","url":null,"abstract":"<div><div>Catalytic membranes with leaching-resistant noble metals offer promise for continuous oxidative water purification, but their adoption is hampered by inefficient catalyst utilization and poorly understood reaction mechanisms. Here, we present the <em>in situ</em> synthesis of entangled particle-polymer complexes within the casting solution to fabricate polyethersulfone membranes with pore-confined ultrasmall noble metal nanoparticles. This <em>all-in-one</em> approach maximizes catalyst utilization by achieving pore surface confinement of nanoparticles in near-quantitative yields. By combining thermodynamic, kinetic, and radical probe analyses, we reveal the catalytic mechanisms of pore-confined Ag, Au, Ru, and Pd in degrading ofloxacin via peroxymonosulfate (PMS) activation in a realistic water matrix. We further introduce a novel mechanistic model for catalytic pollutant remediation in complex environments, providing a fundamental advance for rational catalyst design. Going beyond conventional models, our model integrates several key catalyst parameters into a single quantitative rate equation: thermodynamic reactivity of active species, catalytic rate constant, PMS affinity, and interference by water matrix components. Furthermore, a unique dual radical/non-radical PMS activation pathway was identified for pore-confined Pd, promoting a catalytic turnover frequency an order of magnitude higher than those of catalytic membranes reported in the literature. The Pd-decorated membrane also drastically outperformed comparable systems for continuous water treatment under environmentally-relevant conditions: it achieved complete flow-through degradation (1.2 s residence time) of 10 μg L<sup>−1</sup> ofloxacin in an ionic matrix at neutral pH to below the predicted no-effect concentration (<26 ng L<sup>−1</sup>), maintaining this single-pass removal over 80 h (28 000 L m<sup>−2</sup> volume) flow operation without any metal leaching.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"32 ","pages":"Article 101261"},"PeriodicalIF":7.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145619935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The growing demand for sustainable construction practices has promoted interest in the adoption of low-carbon materials for pavement infrastructure. Engineered geopolymer binders have emerged as a promising and environmentally friendly alternative to traditional cementitious binders in soil stabilization, offering reduced carbon emissions, while maintaining comparable mechanical properties. This study investigates the feasibility of using two-part geopolymer stabilized recycled concrete aggregate (RCA) and recycled glass (RG) mixtures in sustainable pavement construction. In this regard, RCA and RG were blended in different proportions and stabilized with alkali-activated fly ash (FA), slag (S), and a binary precursor of (FA+S) at a fixed 50:50 ratio for pavements. The effects of RCA/RG proportion, precursor type and dosage, and curing regime on geopolymer stabilized RCA/RG mixtures were investigated by performing unconfined compressive strength (UCS). The optimum geopolymer stabilized RCA/RG mixtures were further characterized for their resilient modulus and flexural performance through conducting repeated loaded triaxial (RLT) and four-point bending tests. The microstructure of geopolymer stabilized RCA/RG samples were studied scanning electron microscopy (SEM) to understand the reinforcing mechanisms for strength gain. The test results suggested that increasing the RG content led to a decrease in the strength of the geopolymer stabilized RCA/RG mixtures. In contrast, increasing the precursor dosages generally resulted higher UCS values of the stabilized RCA/RG mixtures. Overall, FA geopolymer stabilized RCA/RG mixtures had lower UCS compared to S and (FA+S) geopolymer stabilized RCA/RG mixtures. Most of S and (FA+S) geopolymer stabilized RCA/RG mixtures complied the minimum UCS requirement of 3 MPa stipulated by the local road authority, expect for few stabilized RCA/RG mixtures with addition of 5% precursor dosage. Both curing time and temperature play a critical role influencing the strength development of the geopolymer stabilized RCA/RG mixtures. The RLT and four-point bending test results demonstrated that the addition of RG decreased the resilient modulus and fatigue performance of the geopolymer stabilized RCA/RG mixtures. The findings of this study highlight the potential of geopolymer stabilized RCA/RG mixtures as greener construction materials for pavement structures.
{"title":"Flexural fatigue behavior of low-carbon pavement materials using geopolymer stabilized recycled concrete and recycled glass blends","authors":"Dulanja Dayaratne, Youli Lin, Farshid Maghool, Arul Arulrajah, Muditha Senanayake","doi":"10.1016/j.mtsust.2025.101269","DOIUrl":"10.1016/j.mtsust.2025.101269","url":null,"abstract":"<div><div>The growing demand for sustainable construction practices has promoted interest in the adoption of low-carbon materials for pavement infrastructure. Engineered geopolymer binders have emerged as a promising and environmentally friendly alternative to traditional cementitious binders in soil stabilization, offering reduced carbon emissions, while maintaining comparable mechanical properties. This study investigates the feasibility of using two-part geopolymer stabilized recycled concrete aggregate (RCA) and recycled glass (RG) mixtures in sustainable pavement construction. In this regard, RCA and RG were blended in different proportions and stabilized with alkali-activated fly ash (FA), slag (S), and a binary precursor of (FA+S) at a fixed 50:50 ratio for pavements. The effects of RCA/RG proportion, precursor type and dosage, and curing regime on geopolymer stabilized RCA/RG mixtures were investigated by performing unconfined compressive strength (UCS). The optimum geopolymer stabilized RCA/RG mixtures were further characterized for their resilient modulus and flexural performance through conducting repeated loaded triaxial (RLT) and four-point bending tests. The microstructure of geopolymer stabilized RCA/RG samples were studied scanning electron microscopy (SEM) to understand the reinforcing mechanisms for strength gain. The test results suggested that increasing the RG content led to a decrease in the strength of the geopolymer stabilized RCA/RG mixtures. In contrast, increasing the precursor dosages generally resulted higher UCS values of the stabilized RCA/RG mixtures. Overall, FA geopolymer stabilized RCA/RG mixtures had lower UCS compared to S and (FA+S) geopolymer stabilized RCA/RG mixtures. Most of S and (FA+S) geopolymer stabilized RCA/RG mixtures complied the minimum UCS requirement of 3 MPa stipulated by the local road authority, expect for few stabilized RCA/RG mixtures with addition of 5% precursor dosage. Both curing time and temperature play a critical role influencing the strength development of the geopolymer stabilized RCA/RG mixtures. The RLT and four-point bending test results demonstrated that the addition of RG decreased the resilient modulus and fatigue performance of the geopolymer stabilized RCA/RG mixtures. The findings of this study highlight the potential of geopolymer stabilized RCA/RG mixtures as greener construction materials for pavement structures.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"32 ","pages":"Article 101269"},"PeriodicalIF":7.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.mtsust.2025.101264
Maha Awjan Alreshidi , Krishna Kumar Yadav , Amel Gacem , S. Padmanabhan , S. Ganesan , S. Mahalingam , T. Vinod Kumar , P. Saravanan , Kamal Y. Thajudeen , Ahmed M. Fallatah , Mohammed Muqtader Ahmed , G. Shoba , C. Kavitha , P. Tamizhdurai , Mohammad Khalid
In today's dynamic energy landscape, the shift toward sustainable sources is more urgent than ever. Among emerging solutions, green hydrogen stands out especially for hard-to-decarbonize sectors like transportation and aviation. Sustainable hydrogen originates by electrolysis through renewable energy, providing a zero-carbon substitute for conventional hydrogen, which is primarily generated by carbon-intensive steam methane reforming. Hydrogen's unique properties such as a high energy-to-weight ratio and compatibility with existing infrastructure make it more than just a clean fuel. It represents a paradigm shift in how energy is produced, stored, and used. According to the authoritative International Energy Agency (IEA), by 2040, worldwide consumption of energy could increase by as much as 30 %. Considering this prerequisite with fossil fuels would only worsen climate change, making green hydrogen not just viable but essential. Despite its promise, challenges persist. Safety concerns around hydrogen's flammability have been addressed through modern handling protocols However, its low volumetric energy density presents storage and transportation issues—particularly in aerospace. Encouragingly, technological advancements in high-pressure tanks, cryogenic systems, and solid-state hydrogen carriers are enhancing feasibility and safety.
This review examines the potential and challenges of green hydrogen, with a focus on its application in aviation. It highlights advances in fuel cells, liquefaction, and hydrogen storage that enhance efficiency and safety. Hydrogen-powered aircraft prototypes show projected emission cuts of 50–75 % compared to conventional jet fuels. The review identifies key challenges—scaling infrastructure, reducing costs, and regulatory alignment—and proposes solutions including investment incentives and global safety standards. It also outlines future research directions in materials, hybrid propulsion, and life-cycle assessment, reinforcing green hydrogen's role in sustainable aviation.
{"title":"Zero-emission transportation and aviation through green hydrogen innovation","authors":"Maha Awjan Alreshidi , Krishna Kumar Yadav , Amel Gacem , S. Padmanabhan , S. Ganesan , S. Mahalingam , T. Vinod Kumar , P. Saravanan , Kamal Y. Thajudeen , Ahmed M. Fallatah , Mohammed Muqtader Ahmed , G. Shoba , C. Kavitha , P. Tamizhdurai , Mohammad Khalid","doi":"10.1016/j.mtsust.2025.101264","DOIUrl":"10.1016/j.mtsust.2025.101264","url":null,"abstract":"<div><div>In today's dynamic energy landscape, the shift toward sustainable sources is more urgent than ever. Among emerging solutions, green hydrogen stands out especially for hard-to-decarbonize sectors like transportation and aviation<strong>.</strong> Sustainable hydrogen originates by electrolysis through renewable energy, providing a zero-carbon substitute for conventional hydrogen, which is primarily generated by carbon-intensive steam methane reforming<strong>.</strong> Hydrogen's unique properties such as a high energy-to-weight ratio and compatibility with existing infrastructure make it more than just a clean fuel. It represents a paradigm shift in how energy is produced, stored, and used. According to the authoritative International Energy Agency (IEA), by 2040, worldwide consumption of energy could increase by as much as 30 %. Considering this prerequisite with fossil fuels would only worsen climate change, making green hydrogen not just viable but essential. Despite its promise, challenges persist. Safety concerns around hydrogen's flammability have been addressed through modern handling protocols However, its low volumetric energy density presents storage and transportation issues—particularly in aerospace. Encouragingly, technological advancements in high-pressure tanks, cryogenic systems, and solid-state hydrogen carriers are enhancing feasibility and safety.</div><div>This review examines the potential and challenges of green hydrogen, with a focus on its application in aviation. It highlights advances in fuel cells, liquefaction, and hydrogen storage that enhance efficiency and safety. Hydrogen-powered aircraft prototypes show projected emission cuts of 50–75 % compared to conventional jet fuels. The review identifies key challenges—scaling infrastructure, reducing costs, and regulatory alignment—and proposes solutions including investment incentives and global safety standards. It also outlines future research directions in materials, hybrid propulsion, and life-cycle assessment, reinforcing green hydrogen's role in sustainable aviation.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"32 ","pages":"Article 101264"},"PeriodicalIF":7.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.mtsust.2025.101263
Alessandro Gottuso , Marcin Kobielusz , Wojciech Macyk , Michele Fedel , Francesco Parrino
The photocatalytic oxidative cleavage of olefins represents a sustainable route to carbonyl compounds under mild conditions and with high atom economy. While in photocatalytic domains nitrate radicals have emerged as effective mediators for this transformation, current methodologies rely on stoichiometric silver ions as sacrificial electron scavengers, a limitation that compromises cost-efficiency and environmental sustainability. In this work, we demonstrate the selective oxidative cleavage of styrene using an electro-assisted photocatalytic (EA@PC) system, wherein an externally applied bias replaces the function of silver, enabling in situ nitrate radical generation without the need for sacrificial reagents. This strategy achieves comparable efficiency to silver-based systems while mitigating their drawbacks, representing a more scalable and environmentally compatible platform for nitrate radical-mediated oxidative transformations and advancing the practical applicability of heterogeneous photocatalysis in synthetic chemistry.
{"title":"Advancing nitrate radical chemistry through electro-assisted photocatalytic cleavage of olefins","authors":"Alessandro Gottuso , Marcin Kobielusz , Wojciech Macyk , Michele Fedel , Francesco Parrino","doi":"10.1016/j.mtsust.2025.101263","DOIUrl":"10.1016/j.mtsust.2025.101263","url":null,"abstract":"<div><div>The photocatalytic oxidative cleavage of olefins represents a sustainable route to carbonyl compounds under mild conditions and with high atom economy. While in photocatalytic domains nitrate radicals have emerged as effective mediators for this transformation, current methodologies rely on stoichiometric silver ions as sacrificial electron scavengers, a limitation that compromises cost-efficiency and environmental sustainability. In this work, we demonstrate the selective oxidative cleavage of styrene using an electro-assisted photocatalytic (EA@PC) system, wherein an externally applied bias replaces the function of silver, enabling in situ nitrate radical generation without the need for sacrificial reagents. This strategy achieves comparable efficiency to silver-based systems while mitigating their drawbacks, representing a more scalable and environmentally compatible platform for nitrate radical-mediated oxidative transformations and advancing the practical applicability of heterogeneous photocatalysis in synthetic chemistry.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"32 ","pages":"Article 101263"},"PeriodicalIF":7.9,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-30DOI: 10.1016/j.mtsust.2025.101265
Hana M. Abumelha , Reem Ghubayra , Zahra H. Alhalafi , Kholood M. Alkhamis , Amnah S. Al Zbedy , Nasser A. Alamrani , Ali Sayqal , Nashwa M. El-Metwaly
The ultrasonic-chemical synthesis of pure tin dioxide quantum dots (SnO2QDs) and zinc-doped tin dioxide quantum dots (SnO2QDs/Zns) were reported for photocatalytic abatement of Reactive Yellow 145 (RY145) dye and real textile wastewater treatment. Structural characterization confirmed the retention of the rutile SnO2 phase with quantum-confined crystallite sizes ranging from 7.47 to 9.63 nm, and uniform Zn incorporation without forming segregated ZnO phases at low doping levels, as evidenced by XRD and EDX mapping. Optical analyses revealed tunable bandgap energies from 3.06 eV in undoped SnO2QDs to 3.51 eV in higher Zn-doped samples. The photocatalytic activity, assessed via degradation kinetics of RY145 under Xenon lamp irradiation, demonstrated a marked improvement for SnO2QDs/Zn1 (4 % Zn) with a rate constant (k) of 9.92 × 10−3 s−1, exceeding the performance of undoped SnO2QDs1 (k = 6.93 × 10−3 s−1) and surpassing SnO2QDs/Zn2 (6 % Zn) by over 320 %. Notably, the catalysts maintained over 87 % activity after seven recycling cycles in real industrial wastewater, emphasizing operational stability. An economic evaluation revealed a 25.4 % cost reduction for SnO2QDs/Zn1 relative to SnO2QDs/Zn2. This investigation underscores the critical role of nanoscale structural engineering and dopant optimization in advancing semiconductor photocatalysts for environmental applications and water treatment technologies.
{"title":"Remarkable photocatalytic efficiency, economic analysis and recycling processes of Sn-Zn quantum dots oxides for Reactive Yellow 145 dye removal and real industrial wastewater treatment","authors":"Hana M. Abumelha , Reem Ghubayra , Zahra H. Alhalafi , Kholood M. Alkhamis , Amnah S. Al Zbedy , Nasser A. Alamrani , Ali Sayqal , Nashwa M. El-Metwaly","doi":"10.1016/j.mtsust.2025.101265","DOIUrl":"10.1016/j.mtsust.2025.101265","url":null,"abstract":"<div><div>The ultrasonic-chemical synthesis of pure tin dioxide quantum dots (SnO<sub>2</sub>QDs) and zinc-doped tin dioxide quantum dots (SnO<sub>2</sub>QDs/Zn<sub>s</sub>) were reported for photocatalytic abatement of Reactive Yellow 145 (RY145) dye and real textile wastewater treatment. Structural characterization confirmed the retention of the rutile SnO<sub>2</sub> phase with quantum-confined crystallite sizes ranging from 7.47 to 9.63 nm, and uniform Zn incorporation without forming segregated ZnO phases at low doping levels, as evidenced by XRD and EDX mapping. Optical analyses revealed tunable bandgap energies from 3.06 eV in undoped SnO<sub>2</sub>QDs to 3.51 eV in higher Zn-doped samples. The photocatalytic activity, assessed via degradation kinetics of RY145 under Xenon lamp irradiation, demonstrated a marked improvement for SnO<sub>2</sub>QDs/Zn1 (4 % Zn) with a rate constant (k) of 9.92 × 10<sup>−3</sup> s<sup>−1</sup>, exceeding the performance of undoped SnO<sub>2</sub>QDs1 (k = 6.93 × 10<sup>−3</sup> s<sup>−1</sup>) and surpassing SnO<sub>2</sub>QDs/Zn2 (6 % Zn) by over 320 %. Notably, the catalysts maintained over 87 % activity after seven recycling cycles in real industrial wastewater, emphasizing operational stability. An economic evaluation revealed a 25.4 % cost reduction for SnO<sub>2</sub>QDs/Zn1 relative to SnO<sub>2</sub>QDs/Zn2. This investigation underscores the critical role of nanoscale structural engineering and dopant optimization in advancing semiconductor photocatalysts for environmental applications and water treatment technologies.</div></div>","PeriodicalId":18322,"journal":{"name":"Materials Today Sustainability","volume":"33 ","pages":"Article 101265"},"PeriodicalIF":7.9,"publicationDate":"2025-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145683101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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