The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Po Keung Wong - One of the best experts on this subject based on the ideXlab platform.
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hydrogen production from natural organic matter via cascading oxic anoxic photocatalytic processes an energy recovering Water Purification Technology
Water Research, 2020Co-Authors: Guocheng Huang, Zhengtao Xiao, Weiqian Zhen, Yaxin Fan, Cuiping Zeng, Shengwei Liu, Po Keung WongAbstract:Abstract Photocatalysis provides a “green” strategy to produce the clean energy of H2. However, the realization of efficient H2 production is usually accomplished by the consumption of electron donors, which are costly energy carriers themselves. Here, we attempted to utilize the naturally abundant humic acid (HA), a representative natural organic matter (NOM), as the source of electron donor in a cascading oxic-anoxic photocatalytic system. Results showed that degradation of HA and remarkable H2 yield (1660.9 μmol g−1 h−1 at optimal condition) were obtained successively, whereas the anoxic photocatalytic treatment of pristine HA did not improve H2 yield but substantially eliminated the H2 production and HA degradation efficiency. These phenomena suggested the preoxidation process played a vital role in counteracting the detrimental effect of HA on photocatalytic H2 production. Electrochemical measurement indicated that the preoxidized HA harbored more redox-active moieties than the untreated HA and thus leading to a higher photo-induced charge carrier separation efficiency. A variety of advanced spectroscopic analyses revealed that the photocatalytic oxic pre-treatment resulted in breakdown of chemically inert, electron mediating and chromophoric aromatic macrostructure of HA to form smaller sized oxygenated organic intermediates. These intermediates were more nucleophilic than the pristine HA and acted as sacrificial reagent in the subsequent anoxic process for boosting H2 production. This study showcases an energy recovering Water remediation process and paves the way for the design of novel photocatalytic technologies for environmental application.
Guocheng Huang - One of the best experts on this subject based on the ideXlab platform.
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hydrogen production from natural organic matter via cascading oxic anoxic photocatalytic processes an energy recovering Water Purification Technology
Water Research, 2020Co-Authors: Guocheng Huang, Zhengtao Xiao, Weiqian Zhen, Yaxin Fan, Cuiping Zeng, Shengwei Liu, Po Keung WongAbstract:Abstract Photocatalysis provides a “green” strategy to produce the clean energy of H2. However, the realization of efficient H2 production is usually accomplished by the consumption of electron donors, which are costly energy carriers themselves. Here, we attempted to utilize the naturally abundant humic acid (HA), a representative natural organic matter (NOM), as the source of electron donor in a cascading oxic-anoxic photocatalytic system. Results showed that degradation of HA and remarkable H2 yield (1660.9 μmol g−1 h−1 at optimal condition) were obtained successively, whereas the anoxic photocatalytic treatment of pristine HA did not improve H2 yield but substantially eliminated the H2 production and HA degradation efficiency. These phenomena suggested the preoxidation process played a vital role in counteracting the detrimental effect of HA on photocatalytic H2 production. Electrochemical measurement indicated that the preoxidized HA harbored more redox-active moieties than the untreated HA and thus leading to a higher photo-induced charge carrier separation efficiency. A variety of advanced spectroscopic analyses revealed that the photocatalytic oxic pre-treatment resulted in breakdown of chemically inert, electron mediating and chromophoric aromatic macrostructure of HA to form smaller sized oxygenated organic intermediates. These intermediates were more nucleophilic than the pristine HA and acted as sacrificial reagent in the subsequent anoxic process for boosting H2 production. This study showcases an energy recovering Water remediation process and paves the way for the design of novel photocatalytic technologies for environmental application.
Steven Dubowsky - One of the best experts on this subject based on the ideXlab platform.
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field evaluation of a community scale solar powered Water Purification Technology a case study of a remote mexican community application
Desalination, 2015Co-Authors: Huda Elasaad, Amy M Bilton, Leah Kelley, Omar Duayhe, Steven DubowskyAbstract:Abstract Lack of clean Water in small remote communities in the developing world is a major health problem. Water Purification and desalination systems powered by solar energy, such as photovoltaic powered reverse osmosis systems (PVRO), are potential solutions to the clean Water problems in these small communities. PVRO systems have been proposed for various locations. However, small PVRO systems with production on the order of 1 m3/day for remote communities present some unique technical, cost and operational problems. This paper reports on a project in which a PVRO system is designed, fabricated and deployed in remote village in the Yucatan Peninsula of Mexico. The community residents are indigenous people who are subsistence farmers and beekeepers. Technical and economic models used to configure the system for the community are presented. A plan is developed in cooperation with the community aimed at making the system self-sustaining in the long term. Methods and materials are developed to permit the community members to operate and maintain the system themselves. The results provide insights for the design and deployment of small community-scale PVRO systems in remote communities.
Ashok Chaudhury - One of the best experts on this subject based on the ideXlab platform.
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biosynthesis of biocompatible and recyclable silver iron and gold iron core shell nanoparticles for Water Purification Technology
Biocatalysis and agricultural biotechnology, 2018Co-Authors: Pawan Kaur, Rajesh Thakur, Himanshu Malwal, Anju Manuja, Ashok ChaudhuryAbstract:Abstract The purpose of this study was to synthesize recyclable iron-silver core-shell nanoparticles (FeO/AgNPs) and iron-gold core-shell nanoparticles (FeO/AuNPs) and iron nanoparticles (FeONPs) using peel extract of pomegranate fruit (PEP). UV–visible spectroscopy confirmed the formation of FeO/AgNPs and FeO/AuNPs as absorbance peak was found at 465 nm and 530 nm, respectively. Electron microscopy analysis of FeO/AgNPs indicated that iron core of 13 nm was surrounded by 14 nm shell of silver nanoparticles while size of FeO/AuNPs was less than 100 nm. Antibacterial and antifungal activity of core-shell nanoparticles (CSNPs) were determined by zone of inhibition method and mycelium inhibition method in vitro, respectively. As a result, biologically synthesized nanoparticles showed high antimicrobial activity against all tested microorganisms. Degradation of aniline blue (AB) dye by the above nanoparticles was also monitored. CSNPs showed maximum dye degradation at 70 °C and pH 10. Biocompatibility study of CSNPs was also carried out on Vero cell lines and the results showed that these core-shell nanoparticles were biocompatible up to 500 µgml−1 concentration. These antimicrobial, biocompatible and recyclable nanoparticles will be suitable for application in Water Purification techniques.
Jinxian Tang - One of the best experts on this subject based on the ideXlab platform.
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feasibility of Water Purification Technology in rural areas of developing countries
Journal of Environmental Management, 2008Co-Authors: Dana M Johnson, David R Hokanson, Qiong Zhang, Kevin D Czupinski, Jinxian TangAbstract:Water scarcity is threatening social and economic growth in rural areas of developing countries. There are potential markets for Water Purification technologies in these regions. The main focus of this article is to evaluate the social, economic and political feasibilities of providing Water Purification technologies to rural areas of developing countries. The findings of this research can serve as the basis for private investors interested in entering this market. Four representative regions were selected for the study. Economic, demographic, and environmental variables of each region were collected and analyzed along with domestic markets and political information. Rural areas of the developing world are populated with poor people unable to fulfill the basic needs for clean Water and sanitation. These people represent an important group of potential users. Due to economic, social, and political risks in these areas, it is difficult to build a strong case for any business or organization focusing on immediate returns on capital investment. A plausible business strategy would be to approach the Water Purification market as a corporate responsibility and social investing in the short term. This would allow an organization to be well positioned once the economic ability of individuals, governments, and donor agencies are better aligned.
