Pub Date : 2024-09-17DOI: 10.1038/s41545-024-00387-6
Siyoung Byun, Muhammad Usman Farid, Nallapaneni Manoj Kumar, Shauhrat S. Chopra, Sangyong Nam, Alicia Kyoungjin An, Sanghyun Jeong
Joule and photothermal heating offer promising avenues for enhancing oil recovery, desorption, and reusability by reducing the viscosity of highly viscous oils, thereby facilitating their mobility on sorbent surface. This study developed a heatable reduced graphene oxide nanoribbon (r-GONR)-coated polyvinylidene fluoride (PVDF) oil sorbent to address these viscosity challenges. The application of heating increased oil desorption by approximately 50%, significantly outperforming the conventional PVDF mat. The r-GONR sorbent, leveraging the photothermal effect, demonstrated exceptional reusability, maintaining 40% oil desorption efficiency up to the 10th cycle. Furthermore, its high oil desorption and reusability translated into considerable economic benefits, with a revenue potential of 6.4–29.0 $/m2, alongside significant environmental impact reduction. This study introduces a novel, sustainable approach to oil desorption and reuse, underscoring the practical applications of heatable materials in enhancing oil recovery.
{"title":"Joule and photothermal heating techniques for oil desorption with techno-economic feasibility and environmental impact analysis","authors":"Siyoung Byun, Muhammad Usman Farid, Nallapaneni Manoj Kumar, Shauhrat S. Chopra, Sangyong Nam, Alicia Kyoungjin An, Sanghyun Jeong","doi":"10.1038/s41545-024-00387-6","DOIUrl":"10.1038/s41545-024-00387-6","url":null,"abstract":"Joule and photothermal heating offer promising avenues for enhancing oil recovery, desorption, and reusability by reducing the viscosity of highly viscous oils, thereby facilitating their mobility on sorbent surface. This study developed a heatable reduced graphene oxide nanoribbon (r-GONR)-coated polyvinylidene fluoride (PVDF) oil sorbent to address these viscosity challenges. The application of heating increased oil desorption by approximately 50%, significantly outperforming the conventional PVDF mat. The r-GONR sorbent, leveraging the photothermal effect, demonstrated exceptional reusability, maintaining 40% oil desorption efficiency up to the 10th cycle. Furthermore, its high oil desorption and reusability translated into considerable economic benefits, with a revenue potential of 6.4–29.0 $/m2, alongside significant environmental impact reduction. This study introduces a novel, sustainable approach to oil desorption and reuse, underscoring the practical applications of heatable materials in enhancing oil recovery.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00387-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142235134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-09-17DOI: 10.1038/s41545-024-00383-w
Weijiang Tang, Zhengjie Wang, Sheng Guo, Rong Chen, Fengxi Chen
Few-layer graphitic carbon nanoribbons (GCN) with rich defective sites were prepared by pyrolysis at 800 oC in N2 of in situ-chelated Fe-polyaniline complexes synthesized via one-pot homogeneous Fenton-like oxidative polymerization of an acidic aniline solution. A minimal amount of iron (0.47 wt%) made a pivotal role in the nanoribbon growth and graphitization of GCN, and deposited highly dispersed iron species on GCN without post-synthesis acid leaching, which greatly simplified the synthesis procedure of GCN with improved yield. GCN exhibited high activity and stability for catalytic degradation of organic pollutants with peroxymonosulfate (PMS) mainly via non-radical pathways. The influences of various operating parameters on the catalytic performance of GCN were investigated. Scavenging tests, spin-trapping electron paramagnetic resonance spectra, electrochemical analyses, and theoretical calculations unveiled that 1O2 was the main reactive oxygen species generated from synergistic activation of PMS on GCN while GCN-mediated electron transfer made a minor contribution to organic degradation.
{"title":"Efficient generation of 1O2 by activating peroxymonosulfate on graphitic carbon nanoribbons for water remediation","authors":"Weijiang Tang, Zhengjie Wang, Sheng Guo, Rong Chen, Fengxi Chen","doi":"10.1038/s41545-024-00383-w","DOIUrl":"10.1038/s41545-024-00383-w","url":null,"abstract":"Few-layer graphitic carbon nanoribbons (GCN) with rich defective sites were prepared by pyrolysis at 800 oC in N2 of in situ-chelated Fe-polyaniline complexes synthesized via one-pot homogeneous Fenton-like oxidative polymerization of an acidic aniline solution. A minimal amount of iron (0.47 wt%) made a pivotal role in the nanoribbon growth and graphitization of GCN, and deposited highly dispersed iron species on GCN without post-synthesis acid leaching, which greatly simplified the synthesis procedure of GCN with improved yield. GCN exhibited high activity and stability for catalytic degradation of organic pollutants with peroxymonosulfate (PMS) mainly via non-radical pathways. The influences of various operating parameters on the catalytic performance of GCN were investigated. Scavenging tests, spin-trapping electron paramagnetic resonance spectra, electrochemical analyses, and theoretical calculations unveiled that 1O2 was the main reactive oxygen species generated from synergistic activation of PMS on GCN while GCN-mediated electron transfer made a minor contribution to organic degradation.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00383-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142235135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-09-16DOI: 10.1038/s41545-024-00384-9
Jayraj V. Vaghasiya, Keval K. Sonigara, Carmen C. Mayorga-Martinez, Martin Pumera
The escalating scarcity of freshwater resources presents significant challenges to global sustainability, demanding innovative solutions by integrating cutting-edge materials and technologies. Here we introduce an autonomous artificial forest (3D AF) for continuous freshwater acquisition. This system features a three-dimensional (3D) architecture incorporating a carbon nanofiber (CNF) network and MXene@polypyrrole (Ti3C2@PPy), enhancing surface area, light absorption, heat distribution, and surface wettability to improve solar vapor generation and fog collection efficiency. The autonomous operation is facilitated by an integrated photothermal actuator that adjusts to the day and night conditions. During daylight, the 3D AF tilts downward to maximize solar exposure for water evaporation, while at night, it self-adjusts to optimize fog particle collection. Notably, our device demonstrates the ability to harvest over 5.5 L m−2 of freshwater daily outdoors. This study showcases the potential of integrating advanced materials and technologies to address pressing global freshwater challenges, paving the way for future innovations in water harvesting.
淡水资源的日益稀缺给全球可持续发展带来了重大挑战，需要通过整合尖端材料和技术来找到创新的解决方案。在此，我们介绍一种用于连续淡水采集的自主人工林（3D AF）。该系统采用三维（3D）结构，结合了碳纳米纤维（CNF）网络和 MXene@polypyrrole (Ti3C2@PPy)，增强了表面积、光吸收、热分布和表面润湿性，从而提高了太阳蒸汽生成和雾气收集效率。集成的光热致动器可根据昼夜条件进行调整，从而促进自主运行。白天，3D AF 向下倾斜，以最大限度地利用太阳光进行水蒸发，而到了晚上，它会进行自我调整，以优化雾粒收集。值得注意的是，我们的设备展示了每天在户外收集超过 5.5 升 m-2 淡水的能力。这项研究展示了整合先进材料和技术以应对全球紧迫的淡水挑战的潜力，为未来集水领域的创新铺平了道路。
{"title":"3D printed Ti3C2@Polymer based artificial forest for autonomous water harvesting system","authors":"Jayraj V. Vaghasiya, Keval K. Sonigara, Carmen C. Mayorga-Martinez, Martin Pumera","doi":"10.1038/s41545-024-00384-9","DOIUrl":"10.1038/s41545-024-00384-9","url":null,"abstract":"The escalating scarcity of freshwater resources presents significant challenges to global sustainability, demanding innovative solutions by integrating cutting-edge materials and technologies. Here we introduce an autonomous artificial forest (3D AF) for continuous freshwater acquisition. This system features a three-dimensional (3D) architecture incorporating a carbon nanofiber (CNF) network and MXene@polypyrrole (Ti3C2@PPy), enhancing surface area, light absorption, heat distribution, and surface wettability to improve solar vapor generation and fog collection efficiency. The autonomous operation is facilitated by an integrated photothermal actuator that adjusts to the day and night conditions. During daylight, the 3D AF tilts downward to maximize solar exposure for water evaporation, while at night, it self-adjusts to optimize fog particle collection. Notably, our device demonstrates the ability to harvest over 5.5 L m−2 of freshwater daily outdoors. This study showcases the potential of integrating advanced materials and technologies to address pressing global freshwater challenges, paving the way for future innovations in water harvesting.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00384-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142234036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-09-16DOI: 10.1038/s41545-024-00389-4
Ge Yu, Hua Kang, Chen Dai, Xinyu Zhu, Shuang Zhong, Fan Wang, Shengshu Ai, Dejun Bian, Donglei Zou
To investigate the effect of Tetrasphaera’s enrichment on phosphorus removal mechanism, three micro-pressure swirl reactor (MPSR) groups were used to experiment on sewage treatment under different SRT (17.2, 50.8, and 68.2 d). Results showed that Tetrasphaera enrichment in the MPSR system was promoted by extending the SRT. After extending the SRT from 17.2 to 68.2 d, the relative abundance of Tetrasphaera increased from 3.1% to 12.1%, and the TP removal efficiency maintained above 92%. The internal circulation results indicated that after extending the SRT, glycogen and polyhydroxybutyrate were co-synthesized during the anaerobic stage, which enhanced the driving force of nutrient removal. Analysis of the microbial composition and functional gene prediction indicated that efficient phosphorus removal can be attributed to the enrichment of Tetrasphaera at long SRT. Overall, the synergistic mechanisms of Tetrasphaera in the organic matter degradation and phosphorus removal processes were integrated into the MPSR.
{"title":"Synergistic phosphorus removal mechanism of Tetrasphaera enrichment in a micro-pressure swirl reactor","authors":"Ge Yu, Hua Kang, Chen Dai, Xinyu Zhu, Shuang Zhong, Fan Wang, Shengshu Ai, Dejun Bian, Donglei Zou","doi":"10.1038/s41545-024-00389-4","DOIUrl":"10.1038/s41545-024-00389-4","url":null,"abstract":"To investigate the effect of Tetrasphaera’s enrichment on phosphorus removal mechanism, three micro-pressure swirl reactor (MPSR) groups were used to experiment on sewage treatment under different SRT (17.2, 50.8, and 68.2 d). Results showed that Tetrasphaera enrichment in the MPSR system was promoted by extending the SRT. After extending the SRT from 17.2 to 68.2 d, the relative abundance of Tetrasphaera increased from 3.1% to 12.1%, and the TP removal efficiency maintained above 92%. The internal circulation results indicated that after extending the SRT, glycogen and polyhydroxybutyrate were co-synthesized during the anaerobic stage, which enhanced the driving force of nutrient removal. Analysis of the microbial composition and functional gene prediction indicated that efficient phosphorus removal can be attributed to the enrichment of Tetrasphaera at long SRT. Overall, the synergistic mechanisms of Tetrasphaera in the organic matter degradation and phosphorus removal processes were integrated into the MPSR.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00389-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142234047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cobalt-based catalysts were synthesized using the molten metal salt method and applied for the degradation of reactive dyeing wastewater. The results demonstrated a degradation of 97.1% for the C.I. Reactive Red 195 solution under the following conditions: 1.0 g/L of Co@MXene, 3 g/L of peroxymonosulfate (PMS), treated at 25 oC for 36 min with initial pH of 7. After adding 20 g/L of NaCl, the dye degradation rate increased to 5.57 times compared to the original rate 0.0894 min−1, but the difference in final degradation was not significant. The enhanced degradation was attributed to the combined action of hydroxyl radicals (•OH), sulfate radicals (SO4•−), and singlet oxygen (1O2). Notably, the Co@MXene catalyst maintained a high dye degradation percentage of 93.5% even after being recycled ten times. The treated dye residue can be recycled for dyeing cotton fabrics with reactive dyes. This study achieves rapid treatment of dye wastewater with wide applicability and provides valuable insights into dye wastewater treatment and environmental remediation.
{"title":"Enhanced degradation and recycling of reactive dye wastewater using cobalt loaded MXene catalysts","authors":"Dawu Shu, Xinqi Zhang, Bo Han, Wanxin Li, Bingxin Wang, Chengshu Xu","doi":"10.1038/s41545-024-00391-w","DOIUrl":"10.1038/s41545-024-00391-w","url":null,"abstract":"Cobalt-based catalysts were synthesized using the molten metal salt method and applied for the degradation of reactive dyeing wastewater. The results demonstrated a degradation of 97.1% for the C.I. Reactive Red 195 solution under the following conditions: 1.0 g/L of Co@MXene, 3 g/L of peroxymonosulfate (PMS), treated at 25 oC for 36 min with initial pH of 7. After adding 20 g/L of NaCl, the dye degradation rate increased to 5.57 times compared to the original rate 0.0894 min−1, but the difference in final degradation was not significant. The enhanced degradation was attributed to the combined action of hydroxyl radicals (•OH), sulfate radicals (SO4•−), and singlet oxygen (1O2). Notably, the Co@MXene catalyst maintained a high dye degradation percentage of 93.5% even after being recycled ten times. The treated dye residue can be recycled for dyeing cotton fabrics with reactive dyes. This study achieves rapid treatment of dye wastewater with wide applicability and provides valuable insights into dye wastewater treatment and environmental remediation.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00391-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142234037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-09-13DOI: 10.1038/s41545-024-00381-y
Dong-Gun Lee, Hanki Kim, SeungCheol Yang, Ji-Hyung Han, Young Sun Mok, Nam Jo Jeong, Jiyeon Choi
The power output of reverse electrodialysis (RED), an important renewable energy technology, can be improved using high-salinity feed solutions. Herein, a RED stack of ultrathin ion exchange membranes was operated continuously for 10 days using reverse osmosis brine (~0.9 M NaClequivalent) and underground water (~0.01 M NaClequivalent). The net power and net energy efficiency were initially 1.8 W m−2cell pair and 40.8%, respectively, and then decreased gradually, as did the generated current and stack resistance. This deterioration was caused not by conventional membrane fouling but by trapped water inside the polymer matrix of the anion exchange membrane, especially near the cathode. The high salinity gradient and ultrathin membranes caused a flux imbalance between co-ion transport and osmotic water permeation. Further, bulk mass transfer was enhanced inside the RED stack to maintain electroneutrality. Therefore, combinations of membranes with high water permeability and permselectivity may be required to achieve stable RED operation.
反向电渗析（RED）是一种重要的可再生能源技术，使用高盐度进料溶液可提高其功率输出。在此，使用反渗透盐水（约 0.9 M NaClequivalent）和地下水（约 0.01 M NaClequivalent）对超薄离子交换膜的 RED 膜堆进行了为期 10 天的连续运行。最初，净功率和净能效分别为 1.8 W m-2cell pair 和 40.8%，然后逐渐下降，产生的电流和堆栈电阻也是如此。造成这种恶化的原因不是传统的膜污垢，而是阴离子交换膜聚合物基质内的滞留水，尤其是阴极附近的滞留水。高盐度梯度和超薄膜造成了共离子传输和渗透水渗透之间的流量失衡。此外，RED 叠层内部的大量传质也得到了加强，以保持电中性。因此，要实现 RED 的稳定运行，可能需要将高透水性和高渗透选择性的膜结合起来。
{"title":"Water trapping inside anion exchange membranes during practical reverse electrodialysis applications","authors":"Dong-Gun Lee, Hanki Kim, SeungCheol Yang, Ji-Hyung Han, Young Sun Mok, Nam Jo Jeong, Jiyeon Choi","doi":"10.1038/s41545-024-00381-y","DOIUrl":"10.1038/s41545-024-00381-y","url":null,"abstract":"The power output of reverse electrodialysis (RED), an important renewable energy technology, can be improved using high-salinity feed solutions. Herein, a RED stack of ultrathin ion exchange membranes was operated continuously for 10 days using reverse osmosis brine (~0.9 M NaClequivalent) and underground water (~0.01 M NaClequivalent). The net power and net energy efficiency were initially 1.8 W m−2cell pair and 40.8%, respectively, and then decreased gradually, as did the generated current and stack resistance. This deterioration was caused not by conventional membrane fouling but by trapped water inside the polymer matrix of the anion exchange membrane, especially near the cathode. The high salinity gradient and ultrathin membranes caused a flux imbalance between co-ion transport and osmotic water permeation. Further, bulk mass transfer was enhanced inside the RED stack to maintain electroneutrality. Therefore, combinations of membranes with high water permeability and permselectivity may be required to achieve stable RED operation.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00381-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142231635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-09-10DOI: 10.1038/s41545-024-00382-x
Weizi Chen, Zipeng Xing, Na Zhang, Tao Cheng, Bo Ren, Xinyue Liu, Zibin Wang, Zhenzi Li, Wei Zhou
Hierarchical Bi2Fe4O9/BiOI S-scheme nanoflower heterostructures are prepared by hydrothermal method, which exhibit exceptional photo-piezoelectric catalytic performance. The tight binding between the sheets ensures the efficient electron transport, and provides a large interface area and adequate reaction sites for photo-piezoelectric catalytic reactions. At the same time, because the water flow in the water body produces hydraulic shear force on the material, the material produces piezoelectric effect. Bi2Fe4O9/BiOI exhibit a remarkable degradation efficiency of 99.4% for tetracycline and a hydrogen production rate of 4089.36 µmol h−1 g−1. The observed behavior can be explained by the combined influence of the formation of S-scheme structure and the process of photo-piezoelectric catalysis, confirmed by in-situ XPS, transient/steady-state fluorescence and piezoelectric response force test. The excellent stability of the material suggests its possible use in the sectors of energy and environment. This work introduces novel concepts for the future advancement of photo-piezoelectric synergistic catalysis.
利用水热法制备了分层 Bi2Fe4O9/BiOI S 型纳米花异质结构，该异质结构具有优异的光压电催化性能。片层之间的紧密结合保证了电子的高效传输，并为光压电催化反应提供了较大的界面面积和充足的反应位点。同时，由于水体中的水流对材料产生水力剪切力，材料产生压电效应。Bi2Fe4O9/BiOI 对四环素的降解效率高达 99.4%，产氢率为 4089.36 µmol h-1 g-1。原位 XPS、瞬态/稳态荧光和压电响应力测试证实，所观察到的行为可解释为 S 型结构的形成和光压电催化过程的共同影响。该材料的出色稳定性表明，它有可能用于能源和环境领域。这项工作为未来推进光压电协同催化引入了新的概念。
{"title":"Hierarchical Bi2Fe4O9/BiOI S-scheme heterojunctions with exceptional hydraulic shear induced photo-piezoelectric catalytic activity","authors":"Weizi Chen, Zipeng Xing, Na Zhang, Tao Cheng, Bo Ren, Xinyue Liu, Zibin Wang, Zhenzi Li, Wei Zhou","doi":"10.1038/s41545-024-00382-x","DOIUrl":"10.1038/s41545-024-00382-x","url":null,"abstract":"Hierarchical Bi2Fe4O9/BiOI S-scheme nanoflower heterostructures are prepared by hydrothermal method, which exhibit exceptional photo-piezoelectric catalytic performance. The tight binding between the sheets ensures the efficient electron transport, and provides a large interface area and adequate reaction sites for photo-piezoelectric catalytic reactions. At the same time, because the water flow in the water body produces hydraulic shear force on the material, the material produces piezoelectric effect. Bi2Fe4O9/BiOI exhibit a remarkable degradation efficiency of 99.4% for tetracycline and a hydrogen production rate of 4089.36 µmol h−1 g−1. The observed behavior can be explained by the combined influence of the formation of S-scheme structure and the process of photo-piezoelectric catalysis, confirmed by in-situ XPS, transient/steady-state fluorescence and piezoelectric response force test. The excellent stability of the material suggests its possible use in the sectors of energy and environment. This work introduces novel concepts for the future advancement of photo-piezoelectric synergistic catalysis.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00382-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142166426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2024-09-09DOI: 10.1038/s41545-024-00380-z
Graeme Prentice-Mott, Lorna Maru, Alexandra Kossik, Evelyn Makena Mugambi, Cynthia Ombok, Raymond Odinoh, Florence Mwikali, Ruthie Rosenberg, Isaac Ngere, Jennifer Murphy, David Berendes
Quality improvements and reduction of disease risk for low-resource shared sanitation facilities require cleanliness assessment approaches that are both rigorous and practical. Using Adenosine Triphosphate (ATP) bioluminescence testing, we assessed contamination on high-touch (HT) surfaces (inner door handles) at 32 shared toilet sites in Kisumu, Kenya. In public toilets, contamination was lowest after cleaning and disinfection (C&D) with 0.5% chlorine solution (adjusted difference in mean log10 Relative Light Units per 100 cm2 (aDiff): −1.61; CI: −2.43, −0.59), followed by C&D with 0.1% chlorine solution (aDiff: −1.16; CI: −1.77, −0.55). ATP levels were not associated with overall observable toilet cleanliness and had poor agreement with visually assessed HT surface cleanliness. Our findings demonstrate the utility of this field-feasible method for detecting the impact of recent C&D in low-resource shared toilets, a novel setting for ATP cleanliness testing, while also highlighting the importance of using effective C&D procedures and addressing HT surfaces within cleaning protocols.
{"title":"ATP-based assessments of recent cleaning and disinfection for high-touch surfaces in low-resource shared toilets","authors":"Graeme Prentice-Mott, Lorna Maru, Alexandra Kossik, Evelyn Makena Mugambi, Cynthia Ombok, Raymond Odinoh, Florence Mwikali, Ruthie Rosenberg, Isaac Ngere, Jennifer Murphy, David Berendes","doi":"10.1038/s41545-024-00380-z","DOIUrl":"10.1038/s41545-024-00380-z","url":null,"abstract":"Quality improvements and reduction of disease risk for low-resource shared sanitation facilities require cleanliness assessment approaches that are both rigorous and practical. Using Adenosine Triphosphate (ATP) bioluminescence testing, we assessed contamination on high-touch (HT) surfaces (inner door handles) at 32 shared toilet sites in Kisumu, Kenya. In public toilets, contamination was lowest after cleaning and disinfection (C&D) with 0.5% chlorine solution (adjusted difference in mean log10 Relative Light Units per 100 cm2 (aDiff): −1.61; CI: −2.43, −0.59), followed by C&D with 0.1% chlorine solution (aDiff: −1.16; CI: −1.77, −0.55). ATP levels were not associated with overall observable toilet cleanliness and had poor agreement with visually assessed HT surface cleanliness. Our findings demonstrate the utility of this field-feasible method for detecting the impact of recent C&D in low-resource shared toilets, a novel setting for ATP cleanliness testing, while also highlighting the importance of using effective C&D procedures and addressing HT surfaces within cleaning protocols.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00380-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, we developed a simple, low-temperature method to synthesize carbonized polymer nanosheets (CPNSs) using sodium alginate, a biopolymer derived from algae, and diammonium hydrogen phosphate. These nanosheets are produced through a solid-state pyrolysis at 180 °C, involving dehydration, cross-linking through phosphate ester bonds, and subsequent carbonization, forming 2D structured CPNSs. These synthesized CPNSs exhibit excellent bacterial adsorption capabilities, particularly against V. parahaemolyticus and S. aureus. When applied to ordinary filter paper, the CPNS-modified paper efficiently filters bacteria from aquaculture water, removing over 98% of V. parahaemolyticus within two hours and maintaining effectiveness after 24 h. In contrast, control filter paper showed significantly reduced efficiency over the same period. Our filtration tests demonstrated enhanced survival rates for shrimp in aquaculture systems, highlighting the potential of CPNSs-modified filter paper as a suitable treatment to reduce the microbiological contamination levels in recirculating aquaculture systems in the event of a disease outbreak.
{"title":"Phosphate ester-linked carbonized polymer nanosheets to limit microbiological contamination in aquaculture water","authors":"Anisha Anand, Binesh Unnikrishnan, Chen-Yow Wang, Jui-Yang Lai, Han-Jia Lin, Chih-Ching Huang","doi":"10.1038/s41545-024-00378-7","DOIUrl":"10.1038/s41545-024-00378-7","url":null,"abstract":"In this study, we developed a simple, low-temperature method to synthesize carbonized polymer nanosheets (CPNSs) using sodium alginate, a biopolymer derived from algae, and diammonium hydrogen phosphate. These nanosheets are produced through a solid-state pyrolysis at 180 °C, involving dehydration, cross-linking through phosphate ester bonds, and subsequent carbonization, forming 2D structured CPNSs. These synthesized CPNSs exhibit excellent bacterial adsorption capabilities, particularly against V. parahaemolyticus and S. aureus. When applied to ordinary filter paper, the CPNS-modified paper efficiently filters bacteria from aquaculture water, removing over 98% of V. parahaemolyticus within two hours and maintaining effectiveness after 24 h. In contrast, control filter paper showed significantly reduced efficiency over the same period. Our filtration tests demonstrated enhanced survival rates for shrimp in aquaculture systems, highlighting the potential of CPNSs-modified filter paper as a suitable treatment to reduce the microbiological contamination levels in recirculating aquaculture systems in the event of a disease outbreak.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00378-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142138070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Here in this study, a novel ternary CuS/HKUST‒1/Ni(acac)2 nano photocatalyst (CSHK‒Ni) was developed through a facile modification of HKUST‒1 MOF with Ni(acac)2 metal complex and by immobilizing CuS into the metal-organic framework (MOF). The incorporation of CuS, a narrow bandgap semiconductor, is anticipated to allow easy excitation by visible-light and improve the photocatalytic potential of the formulated catalyst which is validated by the decrease in the bandgap energy from 3.10 eV of pristine MOF to 2.19 eV. Moreover, the anchoring of the metal complex improves the light harvesting behavior by increased conjugation. Photoluminescence studies provided evidence of the effective separation of the photoinduced charge-carriers, reducing the rate of recombination and enhancing the photocatalytic potential of the CSHK‒Ni nanocomposite. The engineered catalyst displayed remarkable efficiency in the degradation of nitroimidazole containing antibiotics, Tinidazole (TNZ) and Metronidazole (MTZ), via H2O2 assisted AOP achieving a maximum photocatalytic efficiency of 95.87 ± 1.64% and 97.95 ± 1.33% in just 30 min under irradiation of visible light at optimum reaction conditions. The possible degradation pathway was elucidated based on the identification of ROS and degradation intermediates via HR‒LCMS and quenching experiments. Meanwhile, the chemical oxygen demand (COD) and total organic carbon (TOC) removal were also examined, encompassing the discussing of various aspects including reaction conditions, influence of various oxidizing agents, competing species and dissolved organic substrates present in the wastewater, marking the novelty of the study. This research elucidated the role of the CSHK‒Ni nanocomposite as an interesting photocatalyst in the elimination of emerging nitroimidazole containing pharmaceutical pollutant under visible-light exposure, presenting an exciting novel avenue for a cleaner and greener environment in the days to come.
{"title":"Anchoring Ni(II) bisacetylacetonate complex into CuS immobilized MOF for enhanced removal of tinidazole and metronidazole","authors":"Saptarshi Roy, Soumya Ranjan Mishra, Vishal Gadore, Ankur Kanti Guha, Md. Ahmaruzzaman","doi":"10.1038/s41545-024-00375-w","DOIUrl":"10.1038/s41545-024-00375-w","url":null,"abstract":"Here in this study, a novel ternary CuS/HKUST‒1/Ni(acac)2 nano photocatalyst (CSHK‒Ni) was developed through a facile modification of HKUST‒1 MOF with Ni(acac)2 metal complex and by immobilizing CuS into the metal-organic framework (MOF). The incorporation of CuS, a narrow bandgap semiconductor, is anticipated to allow easy excitation by visible-light and improve the photocatalytic potential of the formulated catalyst which is validated by the decrease in the bandgap energy from 3.10 eV of pristine MOF to 2.19 eV. Moreover, the anchoring of the metal complex improves the light harvesting behavior by increased conjugation. Photoluminescence studies provided evidence of the effective separation of the photoinduced charge-carriers, reducing the rate of recombination and enhancing the photocatalytic potential of the CSHK‒Ni nanocomposite. The engineered catalyst displayed remarkable efficiency in the degradation of nitroimidazole containing antibiotics, Tinidazole (TNZ) and Metronidazole (MTZ), via H2O2 assisted AOP achieving a maximum photocatalytic efficiency of 95.87 ± 1.64% and 97.95 ± 1.33% in just 30 min under irradiation of visible light at optimum reaction conditions. The possible degradation pathway was elucidated based on the identification of ROS and degradation intermediates via HR‒LCMS and quenching experiments. Meanwhile, the chemical oxygen demand (COD) and total organic carbon (TOC) removal were also examined, encompassing the discussing of various aspects including reaction conditions, influence of various oxidizing agents, competing species and dissolved organic substrates present in the wastewater, marking the novelty of the study. This research elucidated the role of the CSHK‒Ni nanocomposite as an interesting photocatalyst in the elimination of emerging nitroimidazole containing pharmaceutical pollutant under visible-light exposure, presenting an exciting novel avenue for a cleaner and greener environment in the days to come.","PeriodicalId":19375,"journal":{"name":"npj Clean Water","volume":null,"pages":null},"PeriodicalIF":10.4,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41545-024-00375-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142138075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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