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Adding boron nitride or SiO2/MnO/graphene composite to a flexible thermoelectric generator to change its operation mode to temperature sensor 在柔性热电发生器中加入氮化硼或SiO2/MnO/石墨烯复合材料,使其工作模式变为温度传感器
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2026-01-14 DOI: 10.1016/j.mtsust.2026.101304
L. Ojeda , J. Oliva , G. Gonzalez-Contreras , T.A. Esquivel-Castro , K.P. Padmasree , A.I. Mtz-Enriquez , V. Rodriguez-Gonzalez
This work reports AgSe/SbTe-based thermoelectric (THME) devices and their use as temperature sensors. The AgSe//SbTe-THME device produced an open-circuit-voltage (VO) of 32 mV, a power density (PD) of 100 nW cm−2 and an absolute seebeck-coeficient |S| of 320 μV K−1 in ΔT range of 40–100 °C. Later, the AgSe electrode was replaced with AgSe + Boron nitride (BN) electrode, creating a (AgSe + BN)//SbTe-THME device. The SbTe electrode was also replaced by SbTe + SiO2/MnO/Graphene electrode, and this device was named as AgSe//(SbTe + MnO)-THME. We obtained VO values (at ΔT of 40–100 °C) of 480 mV and 520 mV for the (AgSe + BN)//SbTe-THME and AgSe//(SbTe + MnO)-THME devices, respectively. Those values are 14–15 times higher with respect to the AgSe//SbTe-THME device. The highest power/Seebeck coefficient of 0.9 μW cm−2/5.21 mV K−1 was obtained for the AgSe//(SbTe + MnO)-THME device. The devices above with BN and MnO were also evaluated as temperature sensors (TS) and the lowest response time (Res) of 12.88 s and the highest sensitivity (TCR) of 2.92 % °C−1 were obtained from the (AgSe + BN)//SbTe-TS sensor. Raman and UV–Vis techniques demonstrated that decreasing the content of defects on the electrodes increased the voltages generated by the THME devices and decreased the response times of the sensors. XPS demonstrated that the chemical stability is maintained only in the electrodes of the (AgSe + BN)//SbTe-TS devices despite the increase of temperature, therefore, they increased their sensitivity for the detection of temperature at higher temperatures. The dual devices with thermoelectric and temperature-sensor functions were fabricated on recycled plastics, which reduced considerably their cost.
本文报道了基于AgSe/ sbte的热电(THME)器件及其作为温度传感器的用途。AgSe//SbTe-THME器件的开路电压(VO)为32 mV,功率密度(PD)为100 nW cm−2,在ΔT 40-100°C范围内,绝对seebeck系数|S|为320 μV K−1。随后,将AgSe电极替换为AgSe +氮化硼(BN)电极,形成(AgSe + BN)//SbTe-THME器件。将SbTe电极替换为SbTe + SiO2/MnO/石墨烯电极,并命名为AgSe//(SbTe + MnO)-THME。我们获得了(AgSe + BN)//SbTe-THME和(AgSe //(SbTe + MnO)-THME器件的VO值(ΔT为40-100 °C)分别为480 mV和520 mV。这些值相对于AgSe//SbTe-THME设备高14-15倍。AgSe//(SbTe + MnO)-THME器件的功率/塞贝克系数最高为0.9 μW cm−2/5.21 mV K−1。上述含有BN和MnO的器件也被评价为温度传感器(TS), (AgSe + BN)//SbTe-TS传感器的响应时间(Res)最低为12.88 s,灵敏度(TCR)最高为2.92 %°C−1。拉曼和UV-Vis技术表明,减少电极上缺陷的含量会增加THME器件产生的电压,并缩短传感器的响应时间。XPS表明,尽管温度升高,但仅在(AgSe + BN)//SbTe-TS器件的电极中保持化学稳定性,因此,它们在更高温度下提高了检测温度的灵敏度。具有热电和温度传感器功能的双器件是在再生塑料上制造的,这大大降低了它们的成本。
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引用次数: 0
Effects of corrosion rate, mechanical properties, toxicity, and bone healing towards different surface modification of biodegradable metallic: A systematic review 不同表面改性对生物可降解金属的腐蚀速率、力学性能、毒性和骨愈合的影响:系统综述
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2026-01-14 DOI: 10.1016/j.mtsust.2026.101307
Siti Adawiyah Zulkefli , Nurin Tihani Nazemi , Zatul Faqihah Mohd Salaha , Gan Hong Seng , Mohammed Rafiq Abdul Kadir , Muhammad Hanif Ramlee
Magnesium and its alloys are promising biodegradable implant materials for developing orthopaedic implants. However, the drawback of pure Mg and Mg alloys is their high degradation rate in a biological environment. Thus, several strategies are implemented to enhance corrosion resistance and biocompatibility and achieve a controlled degradation rate for these implants by using surface modification. This systematic review addressed the importance of corrosion rate, mechanical properties, toxicity, and bone healing of the biodegradable metallic implant coated with other materials. From the review, the study indicates that chemical and physical coatings are among the most extensively studied strategies for enhancing the performance of orthopaedic implants. For example, a composite coating made of polycaprolactone (PCL), and amorphous calcium carbonate (ACC) particles has shown improved corrosion resistance when tested in simulated body fluid (SBF). Furthermore, bioactivity osteointegration could be enhanced by calcium phosphate (CaP) coating, such as brushite, β-tricalcium phosphate, and hydroxyapatite. Several studies have shown that a compact HA coating has excellent corrosion resistance and good biocompatibility, which are suitable for biodegradable metal orthopaedic implants. These findings highlight the various successful surface modification methods that could enhance the biodegradable metal implants.
镁及其合金是一种很有前途的生物可降解植入材料。然而,纯镁和镁合金的缺点是它们在生物环境中的降解率高。因此,采用几种策略来增强这些植入物的耐腐蚀性和生物相容性,并通过表面改性来实现可控制的降解率。本文系统综述了生物可降解金属种植体的腐蚀速率、机械性能、毒性和骨愈合的重要性。综上所述,研究表明化学和物理涂层是提高骨科植入物性能的最广泛研究的策略之一。例如,在模拟体液(SBF)中测试时,由聚己内酯(PCL)和无定形碳酸钙(ACC)颗粒制成的复合涂层显示出更好的耐腐蚀性。此外,磷酸钙(CaP)涂层(如刷石、β-磷酸三钙和羟基磷灰石)可以增强骨整合的生物活性。多项研究表明,致密的羟基磷灰石涂层具有优异的耐腐蚀性和良好的生物相容性,适用于生物可降解金属骨科植入物。这些发现强调了各种成功的表面改性方法可以增强生物可降解金属植入物。
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引用次数: 0
Advances in nanotechnology in phase change materials and their applications 纳米技术在相变材料中的应用进展
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2026-01-13 DOI: 10.1016/j.mtsust.2026.101305
Md. Abdullah , Mohammad Obayedullah , Md. Abul Khair , Md Habibullah , Md. Nahidul Islam , Delowar Hossain , Md. Shariful Islam Shuvo
The integration of nanotechnology into phase change materials (PCMs) has substantially advanced thermal energy storage and thermoregulation technologies across diverse sectors, including building construction, electronics cooling, smart textiles, and renewable energy systems. This review provides a comprehensive and critical synthesis of recent progress in nano-enhanced phase change materials (NePCMs), focusing on how nanomaterial incorporation modifies thermophysical behavior, durability, and application performance. Various nanomaterials—such as graphene, carbon nanotubes, and metal oxides are examined for their roles in enhancing thermal conductivity, regulating phase transition kinetics, and improving overall energy efficiency. Compared with conventional PCMs, NePCMs demonstrate markedly improved performance, with reported thermal conductivity enhancements of 20–160 % at nanoparticle loadings of 0.1–5 wt.%, while maintaining latent heat reductions within an acceptable range of <10–15 %. Hybrid nanomaterials and advanced encapsulation strategies, including in-situ polymerization and silica shell encapsulation, enable 10–30 % reductions in melting and solidification times and 30–70 % suppression of supercooling, alongside enhanced leakage resistance. Long-term reliability is evidenced by > 90–95 % latent heat retention after 200–500 thermal cycles. For thermoregulation applications, system-level energy efficiency improvements of 10–25 % are reported within operating temperature windows of 20–200 °C. Despite these advances, critical challenges persist, including nanoparticle agglomeration, increased viscosity, scalability constraints, material cost escalation of 10–40 %, and unresolved environmental and health concerns. This review also evaluates emerging applications in smart textiles, electronics, temperature-controlled packaging, and solar thermal systems, highlighting the cross-sector potential of NePCMs. Furthermore, it addresses sustainability considerations, emphasizing lifecycle assessment, green synthesis, and risk mitigation strategies. Novel insights into artificial intelligence-assisted property prediction and material optimization are discussed. Overall, this work provides a quantitatively benchmarked, application-driven roadmap for the sustainable development and industrial deployment of next-generation NePCMs.
将纳米技术集成到相变材料(pcm)中,在包括建筑施工、电子冷却、智能纺织品和可再生能源系统在内的各个领域,大大提高了热能储存和温度调节技术。本文综述了纳米增强相变材料(NePCMs)的最新进展,重点介绍了纳米材料的掺入如何改变热物理行为、耐久性和应用性能。各种纳米材料——如石墨烯、碳纳米管和金属氧化物——在增强导热性、调节相变动力学和提高整体能源效率方面的作用进行了研究。与传统的PCMs相比,NePCMs表现出明显改善的性能,据报道,在0.1-5 wt的纳米颗粒负载下,NePCMs的导热系数提高了20-160 %。%,同时将潜热减少量保持在可接受的范围内<; 10-15 %。混合纳米材料和先进的封装策略,包括原位聚合和硅壳封装,使熔化和凝固时间减少10 - 30% %,过冷抑制30 - 70% %,同时增强了防泄漏性。在200-500次热循环后,通过 >; 90-95 %的潜热保留率证明了其长期可靠性。对于温度调节应用,据报道,在20-200 °C的工作温度窗口内,系统级能效提高了10-25 %。尽管取得了这些进步,但关键的挑战仍然存在,包括纳米颗粒团聚、粘度增加、可扩展性限制、材料成本上升10 - 40% %,以及未解决的环境和健康问题。本文还评估了在智能纺织品、电子产品、温控包装和太阳能热系统中的新兴应用,强调了nepcm的跨行业潜力。此外,它还涉及可持续性考虑,强调生命周期评估、绿色综合和风险缓解战略。讨论了人工智能辅助性能预测和材料优化的新见解。总的来说,这项工作为下一代nepcm的可持续发展和工业部署提供了定量基准,应用驱动的路线图。
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引用次数: 0
Sustainable and eco-friendly brake pads: Ensuring reliable copper-free performance with minimal steel fiber 可持续环保的刹车片:以最少的钢纤维确保可靠的无铜性能
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2026-01-13 DOI: 10.1016/j.mtsust.2026.101306
Fatemeh Mollaei , Ali Partovinia
Copper, despite its favorable frictional and thermal properties, poses significant environmental concerns, which necessitate the development of sustainable alternatives. In this study, the tribological performance of low-metallic copper-free brake pads reinforced with steel fibers was investigated using a Chase friction testing machine in accordance with the SAE J661 standard. Low-metallic brake pad friction composites reinforced with 10–30 wt% steel fibers were fabricated using hot molding as a manufacturing step. The composites were formed under heat and pressure and subsequently post-cured to obtain the final friction materials. The samples were evaluated for normal and hot friction coefficients and wear rate. To evaluate the mechanical integrity of the brake pad composites, shear strength testing was also performed. By eliminating copper and focusing on frictional stability at different temperatures in steel fiber-reinforced formulations, this method enables accurate and reproducible simulation of real-world braking conditions within a controlled laboratory environment. This approach offers a standardized framework for optimizing environmentally friendly friction materials for automotive applications. The results demonstrated that the formulation containing 15 wt% steel fiber exhibited the most balanced performance, showing a high hot friction coefficient (0.468) and normal friction coefficient of 0.439, indicating consistent friction behavior with low sensitivity to operating conditions, which is regarded as an acceptable coefficient of friction under normal braking conditions. Moreover, this formulation presented the lowest wear rate (4.236 %) and excellent thermal stability. These findings indicate that replacing copper with steel fiber reinforcement can maintain reliable frictional performance and durability, offering an environmentally friendly alternative to conventional copper-based brake pads.
尽管铜具有良好的摩擦和热性能,但它也带来了严重的环境问题,这就需要开发可持续的替代品。采用SAE J661标准的Chase摩擦试验机,对钢纤维增强低金属无铜刹车片的摩擦学性能进行了研究。采用热成型工艺制备了10-30 wt%钢纤维增强的低金属刹车片摩擦复合材料。复合材料在加热和压力下形成,随后进行后固化以获得最终的摩擦材料。测试了试样的法向摩擦系数和热摩擦系数以及磨损率。为了评估刹车片复合材料的力学完整性,还进行了抗剪强度试验。通过消除铜元素,并专注于钢纤维增强配方在不同温度下的摩擦稳定性,该方法可以在受控的实验室环境中精确再现真实制动条件的模拟。这种方法为优化汽车应用的环保摩擦材料提供了一个标准化的框架。结果表明,含15 wt%钢纤维的配方表现出最平衡的性能,热摩擦系数高(0.468),法向摩擦系数0.439,表明摩擦性能一致,对工况敏感性低,在正常制动工况下可以接受摩擦系数。此外,该配方具有最低的磨损率(4.236 %)和优异的热稳定性。这些研究结果表明,用钢纤维增强代替铜可以保持可靠的摩擦性能和耐久性,为传统的铜基刹车片提供了一种环保的替代品。
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引用次数: 0
Integrated AHP–TOPSIS model for renewable energy planning in low-carbon port Cities: Implications for marine pollution mitigation 低碳港口城市可再生能源规划的综合AHP-TOPSIS模型:对海洋污染缓解的影响
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2026-01-12 DOI: 10.1016/j.mtsust.2026.101302
Chen Jiao , Osama Alfarraj , Amr Tolba , Jianyong Yu , Jong Hyuk Park
An integrated Analytic Hierarchy Process–Technique for Order Preference by Similarity to Ideal Solution (AHP–TOPSIS) framework is developed to support renewable energy planning in low-carbon port cities, with explicit attention to marine-pollution mitigation. The approach is applied to Ningbo–Zhoushan Port, China, using a criteria system organised into four main groups and twelve sub-criteria. Judgements from 50 experts indicate that environmental and marine-pollution impacts (weight = 0.36) dominate over technical performance (0.24), social/policy acceptance (0.22), and economic feasibility (0.18), with emission reduction and marine-pollution pressure together accounting for almost 0.29 of the total weight. Combining these weights with normalised performance scores, TOPSIS identifies offshore wind farms (closeness coefficient = 0.83) and hybrid systems with storage and hydrogen-readiness (0.80) as the most suitable options for Ningbo–Zhoushan, followed by coastal onshore wind and port-area solar photovoltaic. At the same time, waste-to-energy/biomass CHP ranks lowest. Scenario analysis confirms the robustness of these findings under varying environmental, cost, and reliability priorities, highlighting portfolios centred on offshore wind and hybrid systems as key to reducing port-related emissions and pressures on coastal waters.
为了支持低碳港口城市的可再生能源规划,并明确关注海洋污染缓解,开发了一个集成的层次分析法-理想解决方案相似性排序偏好技术(AHP-TOPSIS)框架。该方法应用于中国宁波-舟山港,使用的标准系统分为四个主要组和十二个子标准。来自50位专家的判断表明,环境和海洋污染影响(权重 = 0.36)超过了技术性能(0.24)、社会/政策接受度(0.22)和经济可行性(0.18),减排和海洋污染压力合计占总权重的近0.29。将这些权重与标准化性能得分相结合,TOPSIS确定海上风电场(接近系数 = 0.83)和具有存储和氢准备(0.80)的混合系统是宁波-舟山最适合的选择,其次是沿海陆上风能和港区太阳能光伏。与此同时,废物发电/生物质热电联产排名最低。情景分析证实了这些发现在不同环境、成本和可靠性优先级下的稳健性,强调了以海上风电和混合动力系统为中心的投资组合是减少港口相关排放和沿海水域压力的关键。
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引用次数: 0
Advances in biological barrier membranes for guided bone regeneration: Fabrication, characteristics, multifunctional optimization, and clinical prospects 引导骨再生生物屏障膜的研究进展:制备、特性、多功能优化及临床前景
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2026-01-11 DOI: 10.1016/j.mtsust.2026.101303
Hongwei Pan , Yue Qu , Xueqin Hui , Haiquan Yue
Alveolar bone defects with insufficient bone mass, caused by trauma, tumors, congenital disorders, and periodontal inflammation, severely hinder natural tooth preservation and dental implantation, a key challenge in modern oral medicine. Guided bone regeneration(GBR) using barrier membranes is an essential strategy and standard clinical procedure to improve the efficiency of alveolar bone tissue repair. Both non-absorbable and absorbable membranes have good biocompatibility and can serve as barriers. However, they generally suffer from issues such as single structural design, weak mechanical properties, rapid degradation, poor antibacterial ability, and inadequate biological functions. In recent years, to overcome the various problems associated with existing commercial barrier membranes, researchers have optimized the components and controlled the structure of barrier membranes to develop multifunctional barrier membranes suitable for bone tissue regeneration. This review first outlines the common strategies for preparing GBR barrier membranes, their characteristics, and their classification. It also provides a detailed summary of the progress of research on new biomimetic barrier membranes as multifunctional platforms for repairing alveolar bone defects in biomedical engineering. Finally, it summarizes the challenges that multifunctional barrier membranes need to overcome and future development trends, laying a solid foundation for the research and clinical translation of GBR barrier membranes.
创伤、肿瘤、先天性疾病、牙周炎症等引起的牙槽骨缺损严重阻碍了牙齿的自然保存和种植,是现代口腔医学面临的一个关键挑战。利用屏障膜引导骨再生(GBR)是提高牙槽骨组织修复效率的必要策略和标准临床操作。不可吸收膜和可吸收膜都具有良好的生物相容性,可以作为屏障。但它们普遍存在结构设计单一、力学性能弱、降解快、抗菌能力差、生物功能不足等问题。近年来,为了克服现有商用屏障膜存在的各种问题,研究人员对屏障膜的成分进行了优化,并对其结构进行了控制,开发出适合骨组织再生的多功能屏障膜。本文首先概述了制备GBR屏障膜的常用策略,它们的特性和分类。综述了新型仿生屏障膜作为修复牙槽骨缺损的多功能平台在生物医学工程中的研究进展。最后总结了多功能屏障膜需要克服的挑战和未来的发展趋势,为GBR屏障膜的研究和临床转化奠定了坚实的基础。
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引用次数: 0
Methane oxidation on ion-doped ceria catalysts 离子掺杂二氧化铈催化剂上的甲烷氧化
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2026-01-10 DOI: 10.1016/j.mtsust.2026.101300
Zuo Li , Mohamed N. Marei , Yushi Leng , Brian S. Haynes , Alejandro Montoya
This study investigates the oxidation of methane (CH4) on platinum (Pt) and palladium (Pd) ion-doped cerium dioxide (CeO2) catalysts through a multidisciplinary methodology that integrates continuous-flow experimental observations, density functional theory (DFT) modelling, and micro-kinetic analysis. Incorporating Pt or Pd in ionic form into the CeO2 reduces the CH4 oxidation by approximately 100∼150 K compared to undoped CeO2. Under fuel-lean conditions, the reaction kinetics are predominantly influenced by CH4 concentration, exhibiting first-order kinetics, while the dependence on O2 is zero-order. DFT calculations reveal that CH4 dehydrogenation proceeds via hydrogen extraction from surface lattice oxygen, with the doping species facilitating increased reactivity between carbon atoms and lattice oxygen, thus generating carbon monoxide (CO) and carbon dioxide (CO2). The energy profiles obtained from DFT indicate that the rate-limiting steps involve the initial dehydrogenation of CH4 and water formation through surface lattice oxygen extraction.
本研究通过多学科方法研究了甲烷(CH4)在铂(Pt)和钯(Pd)离子掺杂的二氧化铈(CeO2)催化剂上的氧化反应,该方法集成了连续流实验观察、密度泛函数理论(DFT)建模和微动力学分析。与未掺杂的CeO2相比,将离子形式的Pt或Pd掺入CeO2中可使CH4氧化降低约100 ~ 150 K。在低燃料条件下,反应动力学主要受CH4浓度的影响,表现为一级动力学,而对O2的依赖为零级动力学。DFT计算表明,CH4脱氢是通过从表面晶格氧中提取氢进行的,掺杂物质促进了碳原子与晶格氧之间的反应性增强,从而产生一氧化碳(CO)和二氧化碳(CO2)。由DFT得到的能量谱表明,反应的限速步骤包括CH4的初始脱氢和通过表面晶格抽氧生成水。
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引用次数: 0
An overview of composites as construction materials for the Development of sustainable structures 复合材料作为可持续结构发展的建筑材料的概述
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2026-01-08 DOI: 10.1016/j.mtsust.2025.101298
Chiemela Victor Amaechi , Salmia Binti Beddu , Idris Ahmed Ja'e , Abiodun Kolawole Oyetunji , Raqib Abu Salia , Obafemi M. Oyewole , Olalekan O. Ojedokun , Bo Huang
There are numerous environmental impacts associated with the construction industry because it consumes significant energy and other resources. The design and construction of civil structures such as residential buildings require several construction materials. This paper presents an overview of sustainable composite materials for construction projects such as buildings, factories, public structures and offshore structures. The construction materials that are used to produce structural elements, or build houses, as well as other structures include composites and conventional materials. New construction technologies using composite materials, have been developed in the construction sector to promote sustainability. The advantages of using composites as construction materials over traditional materials are highlighted in this paper. There are increasing implementation of composite materials on construction sites as they incorporate fewer materials, light-weight materials, newer designs and time-saving materials. Also, composite materials offer a promising option when it comes to architecture and sustainable construction, as they guarantee high performance. Thus, this paper provides an overview of composites as construction materials for the development of sustainable structures in the construction industry with some recommendations given. This review is to enhance policies for industry application of composites geared towards sustainability.
由于建筑行业消耗大量的能源和其他资源,因此对环境有许多影响。民用建筑的设计和建造,如住宅建筑,需要几种建筑材料。本文介绍了可持续复合材料的建设项目,如建筑物,工厂,公共结构和海上结构的概述。用于生产结构元件或建造房屋以及其他结构的建筑材料包括复合材料和传统材料。使用复合材料的新建筑技术已在建筑领域得到发展,以促进可持续性。本文着重介绍了复合材料作为建筑材料相对于传统材料的优点。复合材料越来越多地应用于建筑工地,因为它们采用了更少的材料、轻质材料、更新的设计和节省时间的材料。此外,复合材料在建筑和可持续建筑方面提供了一个很有前途的选择,因为它们保证了高性能。因此,本文概述了复合材料作为建筑材料在建筑行业可持续结构的发展,并提出了一些建议。本文旨在加强可持续发展的复合材料工业应用政策。
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引用次数: 0
Low-temperature synthesis of a multifunctional NiO/Ni(OH)2 decorated sulfonated bentonite for sustainable and enhanced visible-light-driven degradation and mineralization of bisphenol-A in water 低温合成多功能NiO/Ni(OH)2修饰磺化膨润土,促进双酚a在水中的可见光降解和矿化
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2026-01-07 DOI: 10.1016/j.mtsust.2026.101301
Zeinab M. Ahmed , Ahmed A. Allam , Mohamed I. El-Sayed , Zakaria Abdullah , Yasser Salama , Hassan A. Rudayni , Wail Al Zoubi , Mostafa R. Abukhadra
The persistence of endocrine-disrupting compounds (EDCs) such as bisphenol A (BPA) in aquatic environments necessitates the development of efficient, sustainable, and cost-effective treatment strategies. In this study, a multifunctional photocatalyst composed of nickel oxide (NiO), nickel hydroxide [Ni(OH)2], and metallic nickel (Ni0) supported on sulfonated carbon-rich bentonite (SB) was synthesized via a low-temperature, calcination-free route. The fabrication process—comprising acid activation, ion exchange, and mild chemical reduction—preserves hydroxide-layered structures while integrating redox-active and light-responsive phases within a hierarchically porous clay matrix. The resulting NiO/Ni(OH)2@SB composite demonstrated outstanding photocatalytic performance under visible light. Complete degradation and mineralization of BPA (5 mg/L) were achieved within 20 and 60 min, respectively using 0.5 g/L catalyst. Kinetic modeling confirmed pseudo-first-order behavior (k1 = 0.2177 min−1), while quantum yield analysis indicated high photon-to-reactivity efficiency (Φ = 3.32 × 10−7). Mechanistic studies revealed that photogenerated •OH and •O2 radicals—amplified by Ni2+/Ni3+ redox cycling and Ni0/NiO Schottky junctions—drive the oxidative degradation pathway. The sulfonated bentonite support enhances pollutant adsorption, interfacial contact, and dispersion of the active phases. The catalyst exhibited remarkable structural integrity and reusability, maintaining >90 % of its initial activity after six consecutive cycles, with negligible Ni leaching (<0.001 mg/L). This work offers a scalable and environmentally benign strategy for solar-assisted remediation of phenolic micropollutants. The design principles established herein provide a blueprint for developing next-generation clay-supported photocatalysts targeting a wide range of emerging contaminants in real-world wastewater matrices.
水生环境中持续存在的内分泌干扰化合物(EDCs),如双酚A (BPA),需要开发高效、可持续和具有成本效益的治疗策略。本研究采用低温、免煅烧的方法,在磺化富碳膨润土(SB)上合成了由氧化镍(NiO)、氢氧化镍[Ni(OH)2]和金属镍(Ni0)组成的多功能光催化剂。该工艺包括酸活化、离子交换和温和的化学还原,保留了氢氧化物层状结构,同时将氧化还原活性和光响应相整合在分层多孔粘土基质中。所得NiO/Ni(OH)2@SB复合材料在可见光下表现出优异的光催化性能。在0.5 g/L催化剂的作用下,BPA(5 mg/L)的降解和矿化分别在20和60 min内完成。动力学模型证实了伪一阶行为(k1 = 0.2177 min−1),而量子产率分析表明了高的光子反应效率(Φ = 3.32 × 10−7)。机理研究表明,由Ni2+/Ni3+氧化还原循环和Ni0/NiO肖特基结放大的光生成•OH和•O2−自由基驱动氧化降解途径。磺化膨润土载体增强了污染物的吸附、界面接触和活性相的分散。该催化剂表现出显著的结构完整性和可重复使用性,在连续6次循环后仍保持初始活性的>;90 %,镍浸出(<0.001 mg/L)可以忽略不计。这项工作为太阳能辅助修复酚类微污染物提供了一种可扩展和环保的策略。本文建立的设计原则为开发下一代粘土负载光催化剂提供了蓝图,该催化剂针对现实世界废水基质中广泛出现的污染物。
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引用次数: 0
Assessing the sustainability potential of circular geopolymer concrete: A life cycle assessment and multi-criteria decision making approach 评估圆形地聚合物混凝土的可持续性潜力:生命周期评估和多标准决策方法
IF 7.9 3区 材料科学 Q1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Pub Date : 2025-12-26 DOI: 10.1016/j.mtsust.2025.101297
Omid Bamshad, Amir Mohammad Ramezanianpour
In the life cycle assessment (LCA) of concrete, it is essential to consider the service life, mechanical properties, and end-of-life scenarios to obtain accurate results, especially in the case of comparing geopolymer concretes with ordinary concrete. In this study, a conceptual framework was designed to produce circular concretes based on the main principals of circular economy. Then, a comparative economic and environmental life cycle assessment (LCA) was performed to evaluate the sustainability potential of circular geopolymer concrete (CGPC), geopolymer concrete (GPC), and circular ordinary concrete (COC), as alternatives to Portland cement concrete (PCC), using analytical hierarchy process (AHP). The results showed that using GPC and CGPC significantly alleviated the environmental impacts of cement production, such that they reduced the global warming potential (GWP) by about 69 %. The environmental burdens of CGPC were slightly higher than GPC in all midpoint (<5 %) and endpoint (<2 %) levels. The minimum life cycle cost was related to PCC, and then GPC, CGPC, and COC had higher life cycle costs than PCC with relative total cost of 1.08, 1.14, and 1.18, respectively. According to the multi-criteria decision making and final scores from AHP model, GPC and CGPC performed the best in the sustainability assessment, respectively, with a marginal difference, whereas COC performed the worst.
在混凝土的生命周期评估(LCA)中,为了获得准确的结果,特别是在将地聚合物混凝土与普通混凝土进行比较的情况下,必须考虑使用寿命、力学性能和寿命终止情况。在本研究中,基于循环经济的主要原则,设计了一个概念框架来生产循环混凝土。然后,采用层次分析法(AHP)对圆形地聚合物混凝土(CGPC)、圆形地聚合物混凝土(GPC)和圆形普通混凝土(COC)作为波特兰水泥混凝土(PCC)替代品的可持续性潜力进行了比较经济和环境生命周期评价(LCA)。结果表明,使用GPC和CGPC显著缓解了水泥生产对环境的影响,使全球变暖潜能值(GWP)降低了约69% %。在所有中点(<5 %)和终点(<2 %)水平上,CGPC的环境负担略高于GPC。最小生命周期成本与PCC相关,GPC、CGPC和COC的生命周期成本高于PCC,其相对总成本分别为1.08、1.14和1.18。根据多准则决策和AHP模型的最终得分,GPC和CGPC分别在可持续性评估中表现最佳,差异不大,而COC表现最差。
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Materials Today Sustainability
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