The Experts below are selected from a list of 71298 Experts worldwide ranked by ideXlab platform
Zheng-yang Huo - One of the best experts on this subject based on the ideXlab platform.
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elevating the stability of nanowire electrodes by thin polydopamine coating for low voltage electroporation Disinfection of pathogens in water
Chemical Engineering Journal, 2019Co-Authors: Zheng-yang Huo, Hai Liu, Xing XieAbstract:Abstract Highly efficient, low-energy-consuming, reliable, and easily-applicable Disinfection methods are in great demand for protecting human health from waterborne diseases. Nanowire-assisted low-voltage electroporation enables effective and energy-efficient Disinfection. Nevertheless, the insufficient stability of the nanowires has become the main obstacle in practical applications: the commonly used copper-oxide-nanowire-modified copper foam (CuONW-Cu) electrode can only sustain the complete Disinfection for about 10 min. Here, we improve the stability of the nanowires by applying a protective polydopamine (PDA) coating. The solution based self-polymerization approach produces a robust and uniform PDA layer with a controllable thickness of 0–100 nm. The PDA coating barely affects the effectiveness of the nanowires. With a 100 nm-thick PDA coating, CuONW-Cu electrodes still enable high Disinfection performance. The electroporation Disinfection cell (EDC) equipped with the PDA-coated CuONW-Cu electrodes achieves complete Disinfection (>6.0 log) with a low applied voltage (1 V) and a high flux (1.8 m3 h−1 m−2; 20 s of contact time). Under such operation conditions, the EDC continuously treats water for 16 h while maintaining complete Disinfection. The lifetime of the PDA-coated CuONW-Cu electrode is about 100-fold longer than that of the uncoated CuONW-Cu electrode. Besides, EDCs with PDA-CuONW-Cu electrodes also achieved high-efficiency Disinfection for real and complex environmental systems (secondary effluents from the wastewater treatment plant).
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Nanowire-Modified Three-Dimensional Electrode Enabling Low-Voltage Electroporation for Water Disinfection
Environmental Science and Technology, 2016Co-Authors: Zheng-yang Huo, Tong Yu, Yun Lu, Chao Feng, Xing Xie, Hong-ying HuAbstract:More than 10% of the people in the world still suffer from inadequate access to clean water. Traditional water Disinfection methods (e.g., chlorination and ultraviolet radiation) include concerns about the formation of carcinogenic Disinfection byproducts (DBPs), pathogen reactivation, and/or excessive energy consumption. Recently, a nanowire-assisted electroporation–Disinfection method was introduced as an alternative. Here, we develop a new copper oxide nanowire (CuONW)-modified three-dimensional copper foam electrode using a facile thermal oxidation approach. An electroporation–Disinfection cell (EDC) equipped with two such electrodes has achieved superior Disinfection performance (>7 log removal and no detectable bacteria in the effluent). The Disinfection mechanism of electroporation guarantees an exceedingly low operation voltage (1 V) and level of energy consumption (25 J L–1) with a short contact time (7 s). The low operation voltage avoids chlorine generation and thus reduces the potential of DBP formation. Because of irreversible electroporation damage on cell membranes, no regrowth and/or reactivation of bacteria occurs during storage after EDC treatment. Water Disinfection using EDCs has great potential for practical applications.
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Nanowire-Modified Three-Dimensional Electrode Enabling Low-Voltage Electroporation for Water Disinfection
2016Co-Authors: Zheng-yang Huo, Xing Xie, Chao FengAbstract:More than 10% of the people in the world still suffer from inadequate access to clean water. Traditional water Disinfection methods (e.g., chlorination and ultraviolet radiation) include concerns about the formation of carcinogenic Disinfection byproducts (DBPs), pathogen reactivation, and/or excessive energy consumption. Recently, a nanowire-assisted electroporation–Disinfection method was introduced as an alternative. Here, we develop a new copper oxide nanowire (CuONW)-modified three-dimensional copper foam electrode using a facile thermal oxidation approach. An electroporation–Disinfection cell (EDC) equipped with two such electrodes has achieved superior Disinfection performance (>7 log removal and no detectable bacteria in the effluent). The Disinfection mechanism of electroporation guarantees an exceedingly low operation voltage (1 V) and level of energy consumption (25 J L–1) with a short contact time (7 s). The low operation voltage avoids chlorine generation and thus reduces the potential of DBP formation. Because of irreversible electroporation damage on cell membranes, no regrowth and/or reactivation of bacteria occurs during storage after EDC treatment. Water Disinfection using EDCs has great potential for practical applications
Xing Xie - One of the best experts on this subject based on the ideXlab platform.
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elevating the stability of nanowire electrodes by thin polydopamine coating for low voltage electroporation Disinfection of pathogens in water
Chemical Engineering Journal, 2019Co-Authors: Zheng-yang Huo, Hai Liu, Xing XieAbstract:Abstract Highly efficient, low-energy-consuming, reliable, and easily-applicable Disinfection methods are in great demand for protecting human health from waterborne diseases. Nanowire-assisted low-voltage electroporation enables effective and energy-efficient Disinfection. Nevertheless, the insufficient stability of the nanowires has become the main obstacle in practical applications: the commonly used copper-oxide-nanowire-modified copper foam (CuONW-Cu) electrode can only sustain the complete Disinfection for about 10 min. Here, we improve the stability of the nanowires by applying a protective polydopamine (PDA) coating. The solution based self-polymerization approach produces a robust and uniform PDA layer with a controllable thickness of 0–100 nm. The PDA coating barely affects the effectiveness of the nanowires. With a 100 nm-thick PDA coating, CuONW-Cu electrodes still enable high Disinfection performance. The electroporation Disinfection cell (EDC) equipped with the PDA-coated CuONW-Cu electrodes achieves complete Disinfection (>6.0 log) with a low applied voltage (1 V) and a high flux (1.8 m3 h−1 m−2; 20 s of contact time). Under such operation conditions, the EDC continuously treats water for 16 h while maintaining complete Disinfection. The lifetime of the PDA-coated CuONW-Cu electrode is about 100-fold longer than that of the uncoated CuONW-Cu electrode. Besides, EDCs with PDA-CuONW-Cu electrodes also achieved high-efficiency Disinfection for real and complex environmental systems (secondary effluents from the wastewater treatment plant).
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Nanowire-Modified Three-Dimensional Electrode Enabling Low-Voltage Electroporation for Water Disinfection
Environmental Science and Technology, 2016Co-Authors: Zheng-yang Huo, Tong Yu, Yun Lu, Chao Feng, Xing Xie, Hong-ying HuAbstract:More than 10% of the people in the world still suffer from inadequate access to clean water. Traditional water Disinfection methods (e.g., chlorination and ultraviolet radiation) include concerns about the formation of carcinogenic Disinfection byproducts (DBPs), pathogen reactivation, and/or excessive energy consumption. Recently, a nanowire-assisted electroporation–Disinfection method was introduced as an alternative. Here, we develop a new copper oxide nanowire (CuONW)-modified three-dimensional copper foam electrode using a facile thermal oxidation approach. An electroporation–Disinfection cell (EDC) equipped with two such electrodes has achieved superior Disinfection performance (>7 log removal and no detectable bacteria in the effluent). The Disinfection mechanism of electroporation guarantees an exceedingly low operation voltage (1 V) and level of energy consumption (25 J L–1) with a short contact time (7 s). The low operation voltage avoids chlorine generation and thus reduces the potential of DBP formation. Because of irreversible electroporation damage on cell membranes, no regrowth and/or reactivation of bacteria occurs during storage after EDC treatment. Water Disinfection using EDCs has great potential for practical applications.
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Nanowire-Modified Three-Dimensional Electrode Enabling Low-Voltage Electroporation for Water Disinfection
2016Co-Authors: Zheng-yang Huo, Xing Xie, Chao FengAbstract:More than 10% of the people in the world still suffer from inadequate access to clean water. Traditional water Disinfection methods (e.g., chlorination and ultraviolet radiation) include concerns about the formation of carcinogenic Disinfection byproducts (DBPs), pathogen reactivation, and/or excessive energy consumption. Recently, a nanowire-assisted electroporation–Disinfection method was introduced as an alternative. Here, we develop a new copper oxide nanowire (CuONW)-modified three-dimensional copper foam electrode using a facile thermal oxidation approach. An electroporation–Disinfection cell (EDC) equipped with two such electrodes has achieved superior Disinfection performance (>7 log removal and no detectable bacteria in the effluent). The Disinfection mechanism of electroporation guarantees an exceedingly low operation voltage (1 V) and level of energy consumption (25 J L–1) with a short contact time (7 s). The low operation voltage avoids chlorine generation and thus reduces the potential of DBP formation. Because of irreversible electroporation damage on cell membranes, no regrowth and/or reactivation of bacteria occurs during storage after EDC treatment. Water Disinfection using EDCs has great potential for practical applications
Qiao Wang - One of the best experts on this subject based on the ideXlab platform.
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Disinfection of municipal secondary effluents with microwave induced electrodeless ultraviolet irradiation for water reuse
Journal of Chemical Technology & Biotechnology, 2017Co-Authors: Yue Zhang, Guangshan Zhang, Peng Wang, Qiao WangAbstract:BACKGROUND Disinfection is an essential way to ensure the safety of recycled water. Ultraviolet (UV) is an effective and environmentally friendly technique suitable for the Disinfection of recycled water. However, UV Disinfection also leads to photoreactivation. This work proposes a combined use of UV irradiation and microwave technique to compensate for the limitations of UV Disinfection. RESULTS The process of microwave-induced electrodeless ultraviolet (MW-EUV) irradiation was utilized to disinfect municipal secondary effluents. A homemade columnar electrodeless UV lamp was used as the source of UV irradiation. Good Disinfection results the under optimal microwave power at 600 W were obtained. There was no photoreactivation after sufficient irradiation. Cell damage of Escherichia coli by MW-EUV irradiation was investigated by measuring the leakage of K+ and protein from cells and was observed by an atomic force microscope (AFM). CONCLUSION The MW-EUV irradiation is demonstrated to be a faster and more effective Disinfection method in this study. The irradiated samples could meet the hygienic standards for the reuse of urban recycling water (Standard Number GB/T 18920–2002) in China. The Disinfection mainly depends on UV irradiation. The microwave was the main causes of bacterial breakup and deformation. This irreversible damage offsets the biological self-healing phenomenon in UV Disinfection.
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Disinfection of municipal secondary effluents with microwave induced electrodeless ultraviolet irradiation for water reuse
Journal of Chemical Technology & Biotechnology, 2017Co-Authors: Yue Zhang, Guangshan Zhang, Peng Wang, Qiao WangAbstract:BACKGROUND Disinfection is an essential way to ensure the safety of recycled water. Ultraviolet (UV) is an effective and environmentally friendly technique suitable for the Disinfection of recycled water. However, UV Disinfection also leads to photoreactivation. This work proposes a combined use of UV irradiation and microwave technique to compensate for the limitations of UV Disinfection. RESULTS The process of microwave-induced electrodeless ultraviolet (MW-EUV) irradiation was utilized to disinfect municipal secondary effluents. A homemade columnar electrodeless UV lamp was used as the source of UV irradiation. Good Disinfection results the under optimal microwave power at 600 W were obtained. There was no photoreactivation after sufficient irradiation. Cell damage of Escherichia coli by MW-EUV irradiation was investigated by measuring the leakage of K+ and protein from cells and was observed by an atomic force microscope (AFM). CONCLUSION The MW-EUV irradiation is demonstrated to be a faster and more effective Disinfection method in this study. The irradiated samples could meet the hygienic standards for the reuse of urban recycling water (Standard Number GB/T 18920–2002) in China. The Disinfection mainly depends on UV irradiation. The microwave was the main causes of bacterial breakup and deformation. This irreversible damage offsets the biological self-healing phenomenon in UV Disinfection.
Dipika Patel - One of the best experts on this subject based on the ideXlab platform.
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evaluation of an automated high level Disinfection technology for ultrasound transducers
Journal of Infection and Public Health, 2014Co-Authors: Kare Vickery, Vivian Zaiya Gorgis, Jo Urdach, Dipika PatelAbstract:Summary Background Ultrasound transducer reprocessing is required to prevent the transmission of infections between patients. In some regions, reprocessing practices are not sufficient to achieve high-level Disinfection (HLD), which can result in contaminated probes. Furthermore, current manual HLD methods use toxic chemicals and are prone to operator error/variability. The development of automated, non-toxic HLD Disinfection devices may reduce the risk of transmission and reduce safety risks for operators and patients. This study investigated the Disinfection efficacy of a hydrogen peroxide-based, automated HLD device, the Trophon® EPR, against a range of international standards. Methods Disinfection efficacy was assessed in carrier and simulated use tests against 21 different species of bacteria, fungi and viruses. Carrier tests were performed by placing carriers throughout the Disinfection chamber and measuring the log reduction in viable organisms following Disinfection. These tests were performed according to Association of Analytical Communities International Official Methods and European and ASTM International Standards for bactericidal, fungicidal, mycobactericidal, sporicidal and virucidal Disinfection. Simulated use tests involving the Disinfection of six widely used ultrasound probe models were conducted according to ASTM-E1837-96 using Mycobacterium terrae as a test organism. Results The device satisfied criteria for HLD and sporicidal Disinfection efficacy under all standards tested. Conclusions Automated, hydrogen peroxide-based Disinfection devices offer an alternative to manual ultrasound probe Disinfection technologies. Such devices reduce the risks of operator error and can improve patient and operator safety by preventing exposure to toxic chemicals. The adoption of next-generation Disinfection devices may help to decrease infection risk and improve patient safety.
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Evaluation of an automated high-level Disinfection technology for ultrasound transducers
'Elsevier BV', 2014Co-Authors: Karen Vickery, Vivian Zaiya Gorgis, Jon Burdach, Dipika PatelAbstract:Summary: Background: Ultrasound transducer reprocessing is required to prevent the transmission of infections between patients. In some regions, reprocessing practices are not sufficient to achieve high-level Disinfection (HLD), which can result in contaminated probes. Furthermore, current manual HLD methods use toxic chemicals and are prone to operator error/variability. The development of automated, non-toxic HLD Disinfection devices may reduce the risk of transmission and reduce safety risks for operators and patients. This study investigated the Disinfection efficacy of a hydrogen peroxide-based, automated HLD device, the Trophon® EPR, against a range of international standards. Methods: Disinfection efficacy was assessed in carrier and simulated use tests against 21 different species of bacteria, fungi and viruses. Carrier tests were performed by placing carriers throughout the Disinfection chamber and measuring the log reduction in viable organisms following Disinfection. These tests were performed according to Association of Analytical Communities International Official Methods and European and ASTM International Standards for bactericidal, fungicidal, mycobactericidal, sporicidal and virucidal Disinfection. Simulated use tests involving the Disinfection of six widely used ultrasound probe models were conducted according to ASTM-E1837-96 using Mycobacterium terrae as a test organism. Results: The device satisfied criteria for HLD and sporicidal Disinfection efficacy under all standards tested. Conclusions: Automated, hydrogen peroxide-based Disinfection devices offer an alternative to manual ultrasound probe Disinfection technologies. Such devices reduce the risks of operator error and can improve patient and operator safety by preventing exposure to toxic chemicals. The adoption of next-generation Disinfection devices may help to decrease infection risk and improve patient safety. Keywords: Ultrasound, Reprocessing, High-level Disinfection, Trophon, HL
Nan Zhu - One of the best experts on this subject based on the ideXlab platform.
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efficient photocatalytic Disinfection of escherichia coli by n doped tio2 coated on coal fly ash cenospheres
Journal of Photochemistry and Photobiology A-chemistry, 2018Co-Authors: Yichang Yan, Xiaoqin Zhou, Juanru Lan, Nan Zhu, Tianlong Zheng, Wenbin Cao, Wenxiu LiuAbstract:Abstract In this study, N-doped TiO2 (TiON) coated coal fly ash cenospheres (CFACs) was synthesized for photocatalytic Disinfection against Escherichia coli (E. coli). Based on the physi-chemical evaluation of the TiON coated CFACs (TiON-CFACs), the Disinfection efficiencies of E. coli under three different light sources, namely, ultraviolet A (UVA), visible light (VL), and the light emitting diodes with a wavelength of 420 nm (LED-420), were investigated. Then, a three-factor, four-level orthogonal experiment was designed to evaluate the influences of dosage, pH, and light intensity on its Disinfection efficiency. The TiON-CFACs were effective under UVA, LED-420, and VL irradiation, with Disinfection efficiencies of 5.78 log (45 min UVA), 5.84 log (180 min LED-420) and 5.97 log (300 min VL), respectively. The optimal Disinfection efficiency was achieved at an initial pH of 6 under LED-420 irradiation at 40 mW/cm2 with a dosage of 4 g/L TiON-CFACs. The mechanism of Disinfection was further investigated using a range of free radical scavengers. Findings indicated that H2O2 appeared to play an indispensable role in E. coli Disinfection. Moreover, the TiON-CFACs showed a stable Disinfection efficiency of 5 log, even when the substance was recycled for four times, indicating the reliability and stability of the material. The results showed that the TiON-CFACs are promising in water treatment for photocatalytic Disinfection of E. coli.
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Kinetics of inactivation and photoreactivation of Escherichia coli using ultrasound-enhanced UV-C light-emitting diodes Disinfection.
Ultrasonics sonochemistry, 2016Co-Authors: Xiaoqin Zhou, Yichang Yan, Juanru Lan, Nan ZhuAbstract:Ultraviolet (UV) Disinfection is highly recommended owing to its high Disinfection efficiency and Disinfection by-products free, and UV Light-Emitting Diodes (UV LEDs) is increasingly becoming an alternative of mercury UV lamps for water Disinfection owing to its long lifetime, low input power, and absence of problems on disposal. However, renovation of existing UV lamps faces the challenges for UV Disinfection associated with Disinfection efficiency and photoreactivation, and modified UV Disinfection process is required for practical application. In this study, mathematical rule of Disinfection and photoreactivation in a US enhanced UV Disinfection system was investigated. UV LED with peak emission at 254nm (UV-C LED) was selected as representative for UV lamps, and a low frequency US was used as pretreatment followed by UV Disinfection. The Disinfection efficiency of Escherichia coli in deionized water (DI), DI water with kaoline suspension (DIK), and secondary effluent (SE) of municipal wastewater treatment plant were analyzed. Moreover, photoreactivation of E. coli in DIK water within 6h after Disinfection was conducted. The experimental results showed that the Disinfection efficiencies had good fit with Chick-Watson first-order linear model, and US pretreatment increased the inactivation rate constant for E. coli, which increased from 0.1605 to 0.1887 in the DIK water. Therefore, US pretreatment with UV Disinfection have potential to shorten the retention time and reduce the reactor volume. Moreover, the number of photoreactivated E. coli in effluent was reduced under UV-C LED Disinfection with US pretreatment compared with that under UV-C LED Disinfection alone. The order of maximum percentage of photo-reactivated E. coli was as follows: UV-C LED Disinfection alone at 30mJ/cm2>UV-C LED Disinfection at 25mJ/cm2 with US pretreatment>UV-C LED Disinfection at 30mJ/cm2 with US pretreatment. The survival ratio versus photoreactivation time showed a good fit to second-order logistic model. US pretreatment in UV-C LED Disinfection could improve Disinfection efficiency, reducing photoreactivation in the effluent as well, which offers a promising practical application technology.
