The microporous layer (MPL) is one of the components in the membrane electrode assembly (MEA), the heart of a proton exchange membrane fuel cell (PEMFC), and plays a vital role in managing mass transport and water management in PEMFCs, where these two aspects can negatively impact fuel cell performance if not tackled properly. Thus, the development of MPLs, in terms of material used, preparation methods, and its physical characteristics, has been widely investigated in recent years, to ensure its functionality for improved fuel cell performance. This paper aims to highlight recent MPL studies, focusing on the aforementioned development factors. This paper also addresses the challenges for optimum MPL performance and future trends in MPL development. Thus, the past findings and future outlooks discussed in this paper can act as a useful guideline for future works related to MPL development, to produce good quality MPLs for enhanced fuel cell performance.
{"title":"Microporous layer in proton exchange membrane fuel cells: Advancement in materials and properties","authors":"Muhamad Ariff Amir Hamzah , Siti Kartom Kamarudin , Mahnoush Beygisangchin , Norazuwana Shaari , Roshasnorlyza Hazan , Zulfirdaus Zakaria","doi":"10.1016/j.jece.2024.114220","DOIUrl":"10.1016/j.jece.2024.114220","url":null,"abstract":"<div><div>The microporous layer (MPL) is one of the components in the membrane electrode assembly (MEA), the heart of a proton exchange membrane fuel cell (PEMFC), and plays a vital role in managing mass transport and water management in PEMFCs, where these two aspects can negatively impact fuel cell performance if not tackled properly. Thus, the development of MPLs, in terms of material used, preparation methods, and its physical characteristics, has been widely investigated in recent years, to ensure its functionality for improved fuel cell performance. This paper aims to highlight recent MPL studies, focusing on the aforementioned development factors. This paper also addresses the challenges for optimum MPL performance and future trends in MPL development. Thus, the past findings and future outlooks discussed in this paper can act as a useful guideline for future works related to MPL development, to produce good quality MPLs for enhanced fuel cell performance.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114220"},"PeriodicalIF":7.4,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-25DOI: 10.1016/j.jece.2024.114254
Jianwen Lai , Peiyue Wang , Yunfeng Ma , Zhongkang Han , Heidelore Fiedler , Xiaoqing Lin , Xiaodong Li
In municipal solid waste incineration (MSWI) plants, activated carbon (AC) adsorption is the key technique for eliminating Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) from flue gases. This research thoroughly investigates the potential competitive adsorption between SO2 and PCDD/Fs and examines how adsorption at the center and the edge of the AC layer impacts the adsorption process. The findings show a decline in the removal efficiency of PCDD/Fs from 86.8 % to 84.2 % and further to 74.4 % when using SO2 pre-treated (AC-A3) and H2SO4-impregnated (AC-B2) activated carbon, respectively. Multiple characterization methods reveal that sulfur elements occupy active sites within the inner pores of the activated carbon, reducing the availability of its pore structure, particularly affecting microporous more than mesoporous structures. DFT calculations suggest that the π-π EDA effect facilitates the adsorption of 2,3,7,8-Tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD), whereas dispersion force drive SO2 adsorption. Comparisons among various oxygenated functional groups show that the organic acid anhydride (CO-CO) has better adsorption selectivity toward TCDD and less adsorption to SO2. This study provides a novel perspective on the adsorption mechanisms of PCDD/Fs on AC and the competitive dynamics of sulfur in the flue gas.
在城市固体废物焚烧（MSWI）厂中，活性炭（AC）吸附是消除烟气中多氯二苯并对二恶英和多氯二苯并呋喃（PCDD/Fs）的关键技术。这项研究深入探讨了二氧化硫和多氯二苯并对二恶英和多氯二苯并呋喃（PCDD/Fs）之间潜在的竞争性吸附，并研究了 AC 层中心和边缘的吸附如何影响吸附过程。研究结果表明，使用经二氧化硫预处理（AC-A3）和 H2SO4 浸渍（AC-B2）的活性炭时，多氯二苯并对二恶英和多氯二苯并呋喃的去除率分别从 86.8% 下降到 84.2%，再进一步下降到 74.4%。多种表征方法表明，硫元素占据了活性炭内孔的活性位点，降低了其孔隙结构的可用性，尤其是对微孔结构的影响大于中孔结构。DFT 计算表明，π-π EDA 效应促进了 2,3,7,8-四氯二苯并对二恶英（2,3,7,8-TCDD）的吸附，而分散力则推动了二氧化硫的吸附。对各种含氧官能团的比较表明，有机酸酐（CO-CO）对 TCDD 具有更好的吸附选择性，而对 SO2 的吸附能力较弱。这项研究为多氯二苯并对二恶英和多氯二苯并呋喃在 AC 上的吸附机制以及烟气中硫的竞争动态提供了一个新的视角。
{"title":"Unveiling the competitive mechanism between SO2 and PCDD/Fs on activated carbon adsorption","authors":"Jianwen Lai , Peiyue Wang , Yunfeng Ma , Zhongkang Han , Heidelore Fiedler , Xiaoqing Lin , Xiaodong Li","doi":"10.1016/j.jece.2024.114254","DOIUrl":"10.1016/j.jece.2024.114254","url":null,"abstract":"<div><div>In municipal solid waste incineration (MSWI) plants, activated carbon (AC) adsorption is the key technique for eliminating Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) from flue gases. This research thoroughly investigates the potential competitive adsorption between SO<sub>2</sub> and PCDD/Fs and examines how adsorption at the center and the edge of the AC layer impacts the adsorption process. The findings show a decline in the removal efficiency of PCDD/Fs from 86.8 % to 84.2 % and further to 74.4 % when using SO<sub>2</sub> pre-treated (AC-A3) and H<sub>2</sub>SO<sub>4</sub>-impregnated (AC-B2) activated carbon, respectively. Multiple characterization methods reveal that sulfur elements occupy active sites within the inner pores of the activated carbon, reducing the availability of its pore structure, particularly affecting microporous more than mesoporous structures. DFT calculations suggest that the π-π EDA effect facilitates the adsorption of 2,3,7,8-Tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD), whereas dispersion force drive SO<sub>2</sub> adsorption. Comparisons among various oxygenated functional groups show that the organic acid anhydride (C<img>O-C<img>O) has better adsorption selectivity toward TCDD and less adsorption to SO<sub>2</sub>. This study provides a novel perspective on the adsorption mechanisms of PCDD/Fs on AC and the competitive dynamics of sulfur in the flue gas.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114254"},"PeriodicalIF":7.4,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-25DOI: 10.1016/j.jece.2024.114250
Andrea Szabolcsik-Izbéki , Ildikó Bodnár , István Fábián
It has been demonstrated that treated bathroom greywater (TBGW) is a useful substitute for fresh water for non-potable applications in households. Reuse of TBGW for irrigation, toilet flushing, car washing etc. offers a good opportunity to save drinking water and meet the sustainable development goals (SDGs). In this study, synthetic bathroom greywater (SBGW) was compiled in a controlled manner and used as a substitute for bathroom GW. Detailed statistical analysis also was performed to confirm the similarity between real and synthetic BGWs. SBGW is suitable for testing efficiency of applied treatment methods. It was confirmed that coagulation–flocculation with iron(III) chloride and sand filtration was the most effective method of the tested 7 systems. The best and affordable treatment combination generates good-quality treated SBGW (TSBGW) (pH = 7.54 ± 0.29, TURB = 0.54 ± 0.49 NTU, BOD5 = 21 ± 10 mgL−1, COD = 32 ± 11 mgL−1, and TOC = 12.7 ± 6.7 mgL−1) for different non-potable purposes by complying with the regulated limit values for reuse. The elemental analysis of raw, TSBGW and tap water (TW) samples by MP-AES method provided further support for safe recycling. This study leads to the conclusion that the generation of TBGW by fit-for-purpose treatment can effectively meet the circular economy goals at household level. The recycling of GW is of limited importance in the European Union (EU) and legal regulations are not available in many countries. This study provides novel support for regulating the reuse of water in Eastern European countries.
{"title":"The removal of pollutants from synthetic bathroom greywater by coagulation-flocculation and filtration as a fit-for-purpose method","authors":"Andrea Szabolcsik-Izbéki , Ildikó Bodnár , István Fábián","doi":"10.1016/j.jece.2024.114250","DOIUrl":"10.1016/j.jece.2024.114250","url":null,"abstract":"<div><div>It has been demonstrated that treated bathroom greywater (TBGW) is a useful substitute for fresh water for non-potable applications in households. Reuse of TBGW for irrigation, toilet flushing, car washing etc. offers a good opportunity to save drinking water and meet the sustainable development goals (SDGs). In this study, synthetic bathroom greywater (SBGW) was compiled in a controlled manner and used as a substitute for bathroom GW. Detailed statistical analysis also was performed to confirm the similarity between real and synthetic BGWs. SBGW is suitable for testing efficiency of applied treatment methods. It was confirmed that coagulation–flocculation with iron(III) chloride and sand filtration was the most effective method of the tested 7 systems. The best and affordable treatment combination generates good-quality treated SBGW (TSBGW) (pH = 7.54 ± 0.29, TURB = 0.54 ± 0.49 NTU, BOD<sub>5</sub> = 21 ± 10 mgL<sup>−1</sup>, COD = 32 ± 11 mgL<sup>−1</sup>, and TOC = 12.7 ± 6.7 mgL<sup>−1</sup>) for different non-potable purposes by complying with the regulated limit values for reuse. The elemental analysis of raw, TSBGW and tap water (TW) samples by MP-AES method provided further support for safe recycling. This study leads to the conclusion that the generation of TBGW by fit-for-purpose treatment can effectively meet the circular economy goals at household level. The recycling of GW is of limited importance in the European Union (EU) and legal regulations are not available in many countries. This study provides novel support for regulating the reuse of water in Eastern European countries.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114250"},"PeriodicalIF":7.4,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-25DOI: 10.1016/j.jece.2024.114256
Zelun Jiang , Qianli Huang , Kangping Cui , Guangwei Deng , Yuansheng Huang , Kaifeng Yu , Chen-Xuan Li , Yihan Chen
This study focused on the Fengshuba deep-water reservoir in South China, and systematically explored the distribution characteristics of archaeal communities in the sediment and soil in water level fluctuation zones and their response mechanisms to typical pollutants. The results show that Euryarchaeota and Bathyarchaeota are the dominant phyla in sediment archaeal communities, while Thaumarchaeota dominates in soil. The absolute abundance of archaea in the sediments was lower than that in the soils, but the diversity and richness of archaeal communities were higher than those in the soils. Seasonal changes affected the composition of sediment archaeal communities, and the archaeal compositions in the two habitats also showed significant differences. The neutral community model indicates that the assembly of archaeal communities in sediments is mainly governed by stochastic processes, while deterministic processes dominate in soils. The responses of archaeal communities to pollutants in the two habitats were significantly different. Among them, the carbon-nitrogen ratio and tetracycline concentration are the key factors driving seasonal changes in the archaeal communities in the sediment. Structural equation modeling further showed that the archaeal community in the sediment was positively correlated with organochlorine pesticides and antibiotics, while the archaeal community in the soil showed an opposite trend. This study provides new insights into the complexity of interactions between archaeal communities and typical contaminants in reservoir systems.
{"title":"Differential insights into the distribution characteristics of archaeal communities and their response to typical pollutants in the sediments and soils of deep-water reservoir","authors":"Zelun Jiang , Qianli Huang , Kangping Cui , Guangwei Deng , Yuansheng Huang , Kaifeng Yu , Chen-Xuan Li , Yihan Chen","doi":"10.1016/j.jece.2024.114256","DOIUrl":"10.1016/j.jece.2024.114256","url":null,"abstract":"<div><div>This study focused on the Fengshuba deep-water reservoir in South China, and systematically explored the distribution characteristics of archaeal communities in the sediment and soil in water level fluctuation zones and their response mechanisms to typical pollutants. The results show that <em>Euryarchaeota</em> and <em>Bathyarchaeota</em> are the dominant phyla in sediment archaeal communities, while <em>Thaumarchaeota</em> dominates in soil. The absolute abundance of archaea in the sediments was lower than that in the soils, but the diversity and richness of archaeal communities were higher than those in the soils. Seasonal changes affected the composition of sediment archaeal communities, and the archaeal compositions in the two habitats also showed significant differences. The neutral community model indicates that the assembly of archaeal communities in sediments is mainly governed by stochastic processes, while deterministic processes dominate in soils. The responses of archaeal communities to pollutants in the two habitats were significantly different. Among them, the carbon-nitrogen ratio and tetracycline concentration are the key factors driving seasonal changes in the archaeal communities in the sediment. Structural equation modeling further showed that the archaeal community in the sediment was positively correlated with organochlorine pesticides and antibiotics, while the archaeal community in the soil showed an opposite trend. This study provides new insights into the complexity of interactions between archaeal communities and typical contaminants in reservoir systems.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114256"},"PeriodicalIF":7.4,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-24DOI: 10.1016/j.jece.2024.114241
Hongda Zhang , Yunzhe Zhao , Chenxu Wang , Baolin Liu , Yong Yu
The mediation of vacancy in catalysts is crucial for the enhancement of oxidant activation. Here the boron nitride loaded with Co mixed oxides (Co2O3-CoO) and boron vacancy (Bv) catalyst (Co/BN-X) was prepared to degrade sulfamethoxazole (SMX) by activating peroxymonosulfate (PMS). Under dark condition, Co/BN-3+PMS system can completely remove SMX in surface water within 15 min, and its removal efficiency constant (0.5154 min−1) was 4.0 and 6.7 times greater than those of Co/BN-2+PMS (0.1284 min−1) and Co/BN-1+PMS (0.0771 min−1), respectively. The system showed excellent performance in different influencing factors and cyclic experiments, and exhibited good practical application potential in secondary effluent. Electron paramagnetic resonance, radical quenching and electrochemical tests certified that singlet oxygen (1O2) was the major active species, followed by •O2–, and SO4•–, further elaborating the activation pathway of PMS in Co/BN-3+PMS system. The density functional theory (DFT) calculations confirmed that CoO and PMS-O2 sites were the main reaction sites, and the existence of Bv reduced the adsorption energy of Co/BN-3 for PMS. This work reveals the synergistic effect between Co oxide sites and Bv on the catalyst surface and offers a potential modification method to accelerate Fenton-like reaction.
{"title":"Activation of peroxymonosulfate by boron nitride loaded with Co mixed oxides and boron vacancy for ultrafast removal of drugs in surface water","authors":"Hongda Zhang , Yunzhe Zhao , Chenxu Wang , Baolin Liu , Yong Yu","doi":"10.1016/j.jece.2024.114241","DOIUrl":"10.1016/j.jece.2024.114241","url":null,"abstract":"<div><div>The mediation of vacancy in catalysts is crucial for the enhancement of oxidant activation. Here the boron nitride loaded with Co mixed oxides (Co<sub>2</sub>O<sub>3</sub>-CoO) and boron vacancy (B<sub>v</sub>) catalyst (Co/BN-X) was prepared to degrade sulfamethoxazole (SMX) by activating peroxymonosulfate (PMS). Under dark condition, Co/BN-3+PMS system can completely remove SMX in surface water within 15 min, and its removal efficiency constant (0.5154 min<sup>−1</sup>) was 4.0 and 6.7 times greater than those of Co/BN-2+PMS (0.1284 min<sup>−1</sup>) and Co/BN-1+PMS (0.0771 min<sup>−1</sup>), respectively. The system showed excellent performance in different influencing factors and cyclic experiments, and exhibited good practical application potential in secondary effluent. Electron paramagnetic resonance, radical quenching and electrochemical tests certified that singlet oxygen (<sup>1</sup>O<sub>2</sub>) was the major active species, followed by •O<sub>2</sub><sup>–</sup>, and SO<sub>4</sub><sup>•–</sup>, further elaborating the activation pathway of PMS in Co/BN-3+PMS system. The density functional theory (DFT) calculations confirmed that CoO and PMS-O<sub>2</sub> sites were the main reaction sites, and the existence of B<sub>v</sub> reduced the adsorption energy of Co/BN-3 for PMS. This work reveals the synergistic effect between Co oxide sites and B<sub>v</sub> on the catalyst surface and offers a potential modification method to accelerate Fenton-like reaction.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114241"},"PeriodicalIF":7.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-24DOI: 10.1016/j.jece.2024.114235
Panchan Dansawad , Lixia Cao , Shengyong Zhao , Haigang Gao , Muhammad Sheraz , Cong Xue , Yanxiang Li , Wangliang Li
The CS-rPET electrospun nanofibrous membrane is fabricated from recycled polyethylene terephthalate (rPET) through electrospinning and enhanced with candle soot (CS) to separate oil-water mixtures and emulsions when pre-wetted by oil or water. Using rPET polymers and CS waste reduces the environmental impact of plastic bottle waste and improves its value. The CS-rPET electrospun nanofibrous membrane showed excellent separation performance in oil-water mixtures, achieving over 81.18 % and 71.38 % of separation efficiency through 40 separation cycles after pre-wetting by oil and after washing with ethanol and pre-wetting by water, respectively. The membrane maintained high separation performance after being pre-wetted by oil for water-in-oil emulsions with efficiencies above 99 % and flux exceeding 12,200 L m−2 h−1. Similarly, the efficiencies remained above 98 % for oil-in-water emulsions after being pre-wetted by water, with a flux over 8000 L m−2 h−1. Additionally, the CS-rPET electrospun nanofibrous membrane exhibited high separation efficiencies above 97 % and flux over 14,000 L m−2 h−1 after pre-wetting by oil and 7700 L m−2 h−1 after pre-wetting by water in harsh environmental conditions. Its adaptability of switchable wettability on-demand after pre-wetting by oil or water highlights its potential for a wide range of challenging oil-water separation applications. However, multiple separation cycles, separation efficiency and flux were reduced, indicating the necessity to improve the membrane's efficiency and reduce the chance of water accumulation in multicycle separation.
{"title":"Candle soot-modified rPET electrospun nanofibrous membrane for separating on-demand oil-water mixture and emulsions","authors":"Panchan Dansawad , Lixia Cao , Shengyong Zhao , Haigang Gao , Muhammad Sheraz , Cong Xue , Yanxiang Li , Wangliang Li","doi":"10.1016/j.jece.2024.114235","DOIUrl":"10.1016/j.jece.2024.114235","url":null,"abstract":"<div><div>The CS-rPET electrospun nanofibrous membrane is fabricated from recycled polyethylene terephthalate (rPET) through electrospinning and enhanced with candle soot (CS) to separate oil-water mixtures and emulsions when pre-wetted by oil or water. Using rPET polymers and CS waste reduces the environmental impact of plastic bottle waste and improves its value. The CS-rPET electrospun nanofibrous membrane showed excellent separation performance in oil-water mixtures, achieving over 81.18 % and 71.38 % of separation efficiency through 40 separation cycles after pre-wetting by oil and after washing with ethanol and pre-wetting by water, respectively. The membrane maintained high separation performance after being pre-wetted by oil for water-in-oil emulsions with efficiencies above 99 % and flux exceeding 12,200 L m<sup>−2</sup> h<sup>−1</sup>. Similarly, the efficiencies remained above 98 % for oil-in-water emulsions after being pre-wetted by water, with a flux over 8000 L m<sup>−2</sup> h<sup>−1</sup>. Additionally, the CS-rPET electrospun nanofibrous membrane exhibited high separation efficiencies above 97 % and flux over 14,000 L m<sup>−2</sup> h<sup>−1</sup> after pre-wetting by oil and 7700 L m<sup>−2</sup> h<sup>−1</sup> after pre-wetting by water in harsh environmental conditions. Its adaptability of switchable wettability on-demand after pre-wetting by oil or water highlights its potential for a wide range of challenging oil-water separation applications. However, multiple separation cycles, separation efficiency and flux were reduced, indicating the necessity to improve the membrane's efficiency and reduce the chance of water accumulation in multicycle separation.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114235"},"PeriodicalIF":7.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-24DOI: 10.1016/j.jece.2024.114244
Zhenhua Yang , Xintong Yang , Quanxi Zhang , Xianyun Zheng , Yuexia Zhang , Chuan Dong
The precise regulation of morin levels in both diet and medicine is essential to evaluate the nutritional quality of food. Furthermore, plant yield is attracting considerable attention in the agricultural and herbal industries. Accordingly, the sensing platforms based on orange S and N co-doped carbon dots (SNCDs) were developed to detect morin through photoluminescence signals in aqueous solutions, solid matrices, and zebrafish. These sensing platforms exhibited excellent selectivity toward morin and possessed good anti-interference abilities, achieving limits of detection with 0.31 and 0.19 μM in the aqueous solution and solid state, respectively. Furthermore, the application of the as-prepared SNCDs at low concentration enhanced plant growth (using soybean seedlings as a model). The biological effects may be attributed to the promotion of light reaction and excess light reaction-induced injury. These findings offer novel insights into potential applications of SNCDs in sustainable agriculture and environmental monitoring.
要评估食物的营养质量，就必须精确调节饮食和药物中的吗啉含量。此外，植物产量在农业和草药产业中也备受关注。因此，我们开发了基于橙色 S 和 N 共掺杂碳点（SNCDs）的传感平台，在水溶液、固体基质和斑马鱼中通过光致发光信号检测吗啉。这些传感平台对吗啉具有极佳的选择性和良好的抗干扰能力，在水溶液和固体状态下的检测限分别为 0.31 和 0.19 μM。此外，低浓度施用制备的 SNCD 还能促进植物生长（以大豆幼苗为模型）。这些生物效应可能是由于促进了光反应和过量光反应引起的损伤。这些发现为 SNCDs 在可持续农业和环境监测领域的潜在应用提供了新的见解。
{"title":"Orange carbon dot nanomaterial as optical/visual sensing platforms for morin and a biomass booster for plant seedlings","authors":"Zhenhua Yang , Xintong Yang , Quanxi Zhang , Xianyun Zheng , Yuexia Zhang , Chuan Dong","doi":"10.1016/j.jece.2024.114244","DOIUrl":"10.1016/j.jece.2024.114244","url":null,"abstract":"<div><div>The precise regulation of morin levels in both diet and medicine is essential to evaluate the nutritional quality of food. Furthermore, plant yield is attracting considerable attention in the agricultural and herbal industries. Accordingly, the sensing platforms based on orange S and N co-doped carbon dots (SNCDs) were developed to detect morin through photoluminescence signals in aqueous solutions, solid matrices, and zebrafish. These sensing platforms exhibited excellent selectivity toward morin and possessed good anti-interference abilities, achieving limits of detection with 0.31 and 0.19 μM in the aqueous solution and solid state, respectively. Furthermore, the application of the as-prepared SNCDs at low concentration enhanced plant growth (using soybean seedlings as a model). The biological effects may be attributed to the promotion of light reaction and excess light reaction-induced injury. These findings offer novel insights into potential applications of SNCDs in sustainable agriculture and environmental monitoring.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114244"},"PeriodicalIF":7.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-24DOI: 10.1016/j.jece.2024.114239
Hao Li , Xiangyi Gong , Hua Tong , Fu Feng , Dajung Ren
Three MOF-derived nanoparticles were synthesized by manganese doping and calcination of ZIF-67 precursor. The surface physicochemical properties of these materials were compared using SEM, TEM, XRD, FTIR and BET analyses. Among them, cobalt-manganese oxide nanoflowers (CoMn2O4-NFs) exhibited excellent catalytic performance in the degradation of ciprofloxacin (CIP) by activated peroxymonosulfate (PMS), achieving 100 % removal within 30 minutes with a rate constant (kobs) of 0.2960 min−1. The catalytic mechanism was elucidated by quenching experiments, EPR, electrochemical analysis and X-ray photoelectron spectroscopy (XPS). The results show that the non-radical oxidation process was initiated mainly by direct electron transfer and 1O2 (∼80 %), with a small contribution from the radical SO4·- (∼20 %). The nano-confined structure on the surface of CoMn2O4-NFs makes it easy to combine with PMS to form CoMn2O4-NFs/PMS* complexes, which directly capture electrons from CIP to complete the degradation process. The double redox cycle of cobalt-manganese ions and oxygen vacancies on CoMn2O4-NFs could accelerate the electron transfer process. CoMn2O4-NFs maintained high removal efficiency (>99 %) over a wide pH range (3−11), with minimal interference from most environmental anions, demonstrating strong stability and interference resistance. This study provides insights into using metal-based materials for oxidative degradation of organic pollutants via non-radical pathways.
{"title":"Electron transfer mechanism mediated MOF-derived nanoflowers catalyst for promoting peroxymonosulfate activation and ciprofloxacin degradation","authors":"Hao Li , Xiangyi Gong , Hua Tong , Fu Feng , Dajung Ren","doi":"10.1016/j.jece.2024.114239","DOIUrl":"10.1016/j.jece.2024.114239","url":null,"abstract":"<div><div>Three MOF-derived nanoparticles were synthesized by manganese doping and calcination of ZIF-67 precursor. The surface physicochemical properties of these materials were compared using SEM, TEM, XRD, FTIR and BET analyses. Among them, cobalt-manganese oxide nanoflowers (CoMn<sub>2</sub>O<sub>4</sub>-NFs) exhibited excellent catalytic performance in the degradation of ciprofloxacin (CIP) by activated peroxymonosulfate (PMS), achieving 100 % removal within 30 minutes with a rate constant (k<sub>obs</sub>) of 0.2960 min<sup>−1</sup>. The catalytic mechanism was elucidated by quenching experiments, EPR, electrochemical analysis and X-ray photoelectron spectroscopy (XPS). The results show that the non-radical oxidation process was initiated mainly by direct electron transfer and <sup>1</sup>O<sub>2</sub> (∼80 %), with a small contribution from the radical SO<sub>4</sub><sup>·-</sup> (∼20 %). The nano-confined structure on the surface of CoMn<sub>2</sub>O<sub>4</sub>-NFs makes it easy to combine with PMS to form CoMn<sub>2</sub>O<sub>4</sub>-NFs/PMS* complexes, which directly capture electrons from CIP to complete the degradation process. The double redox cycle of cobalt-manganese ions and oxygen vacancies on CoMn<sub>2</sub>O<sub>4</sub>-NFs could accelerate the electron transfer process. CoMn<sub>2</sub>O<sub>4</sub>-NFs maintained high removal efficiency (>99 %) over a wide pH range (3−11), with minimal interference from most environmental anions, demonstrating strong stability and interference resistance. This study provides insights into using metal-based materials for oxidative degradation of organic pollutants via non-radical pathways.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114239"},"PeriodicalIF":7.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-24DOI: 10.1016/j.jece.2024.114247
Amolwan Sornvichai , Muhammad Adnan , Nouman Ahmad , Ratchanon Piemjaiswang , Pornpote Piumsomboon , Benjapon Chalermsinsuwan
The study investigates the use of potassium-based solid sorbents for CO2 capture in a circulating fluidized bed reactor (CFBR), a promising technology in various industries. The numerical simulations were employed to explore the process of CO2 capture in a three-dimensional (3D) CFBR using K2CO3 adsorbents with a reactive multiphase Eulerian-Eulerian approach. After successfully validating the model for CO2 removal concentration with the experimental data, the key parameters like cooling water temperature, flow rate, distance between cooling stages, diameter, and configuration of cooling tubes were analyzed to optimize K2CO3 performance for CO2 adsorption. Results show adjustments to these parameters can enhance CO2 removal rates. Lowering cooling water temperature improves K2CO3 performance but increases energy consumption. Increasing the cooling water flow rate slightly boosts CO2 removal efficiency. Changes in cooling stage gaps have minimal impact on CO2 removal, but larger cooling tube diameters enhance CO2 removal rates by increasing heat transfer surface area. Different riser configurations affect CO2 removal, with staggered cooling tube arrangements showing superior particle distribution and CO2 removal efficiency. Overall, decreasing temperature improves K2CO3 performance by favorably shifting reaction equilibrium.
{"title":"CFD modeling of CO2 capture in a non-isothermal circulating fluidized bed riser using K2CO3 solid sorbent","authors":"Amolwan Sornvichai , Muhammad Adnan , Nouman Ahmad , Ratchanon Piemjaiswang , Pornpote Piumsomboon , Benjapon Chalermsinsuwan","doi":"10.1016/j.jece.2024.114247","DOIUrl":"10.1016/j.jece.2024.114247","url":null,"abstract":"<div><div>The study investigates the use of potassium-based solid sorbents for CO<sub>2</sub> capture in a circulating fluidized bed reactor (CFBR), a promising technology in various industries. The numerical simulations were employed to explore the process of CO<sub>2</sub> capture in a three-dimensional (3D) CFBR using K<sub>2</sub>CO<sub>3</sub> adsorbents with a reactive multiphase Eulerian-Eulerian approach. After successfully validating the model for CO<sub>2</sub> removal concentration with the experimental data, the key parameters like cooling water temperature, flow rate, distance between cooling stages, diameter, and configuration of cooling tubes were analyzed to optimize K<sub>2</sub>CO<sub>3</sub> performance for CO<sub>2</sub> adsorption. Results show adjustments to these parameters can enhance CO<sub>2</sub> removal rates. Lowering cooling water temperature improves K<sub>2</sub>CO<sub>3</sub> performance but increases energy consumption. Increasing the cooling water flow rate slightly boosts CO<sub>2</sub> removal efficiency. Changes in cooling stage gaps have minimal impact on CO<sub>2</sub> removal, but larger cooling tube diameters enhance CO<sub>2</sub> removal rates by increasing heat transfer surface area. Different riser configurations affect CO<sub>2</sub> removal, with staggered cooling tube arrangements showing superior particle distribution and CO<sub>2</sub> removal efficiency. Overall, decreasing temperature improves K<sub>2</sub>CO<sub>3</sub> performance by favorably shifting reaction equilibrium.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114247"},"PeriodicalIF":7.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L-lactate is an essential biomarker in clinical diagnostics and food quality assessment. This study introduces a novel ratiometric fluorescence sensor, RhB@Zn-MOF, which was specifically designed for the sensitive and selective detection of L-lactate. Through the strategic incorporation of Rhodamine B (RhB) into Zn-MOF, RhB@Zn-MOF was synthesized, exhibiting dual-emission properties and could effectively distinguish L-lactate in complex biological and food matrices such as milk and sweat based on the competitive absorption mechanism. Notably, the sensor achieves a low detection limit of 0.091 μM and demonstrates excellent stability and reproducibility in varied conditions. Furthermore, the integration of the sensor with smartphone technology enables rapid, real-time analysis, showcasing potential applications in sports medicine, clinical environments, and the food industry.
{"title":"Highly sensitive and selective L-lactate monitoring in complex matrices with a ratiometric fluorescent sensor RhB@Zn-MOF","authors":"Bo Jing, Xinke Xu, Jingze Wang, Changyan Sun, Wenjun Li, Zhidong Chang","doi":"10.1016/j.jece.2024.114233","DOIUrl":"10.1016/j.jece.2024.114233","url":null,"abstract":"<div><div>L-lactate is an essential biomarker in clinical diagnostics and food quality assessment. This study introduces a novel ratiometric fluorescence sensor, RhB@Zn-MOF, which was specifically designed for the sensitive and selective detection of L-lactate. Through the strategic incorporation of Rhodamine B (RhB) into Zn-MOF, RhB@Zn-MOF was synthesized, exhibiting dual-emission properties and could effectively distinguish L-lactate in complex biological and food matrices such as milk and sweat based on the competitive absorption mechanism. Notably, the sensor achieves a low detection limit of 0.091 μM and demonstrates excellent stability and reproducibility in varied conditions. Furthermore, the integration of the sensor with smartphone technology enables rapid, real-time analysis, showcasing potential applications in sports medicine, clinical environments, and the food industry.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"12 6","pages":"Article 114233"},"PeriodicalIF":7.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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