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Gao D, Zhang A, Lyu B, Ma J. Visual and rapid fluorescence sensing for hexavalent chromium by hydroxypropyl chitosan passivated bismuth-based perovskite quantum dots. Mikrochim Acta 2024; 191:219. [PMID: 38530477 DOI: 10.1007/s00604-024-06251-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 02/05/2024] [Indexed: 03/28/2024]
Abstract
Hydroxypropyl chitosan-Cs3Bi2Cl9 perovskite quantum dots (HPCS-PQDs) were synthesized by a simple ligand-assisted reprecipitation method via green hydroxypropyl chitosan as the ligand and used as the specific signal of a fluorescence probe to achieve the highly sensitive detection of hexavalent chromium (Cr(VI)) and compared with chitosan-Cs3Bi2Cl9 QDs (CS-PQDs). HPCS-PQDs with multiple active hydroxyl passivations were found to enhance the photoluminescence quantum yield (PLQY) by 90%. After being placed in aqueous solution and irradiated with ultraviolet light for 96 h the fluorescence intensity of HPCS-PQDs remained above 60%. The blue emission of HPCS-PQDs has a good selectivity and short response time (30 s) for Cr(VI). A good linear relationship is established between the fluorescence quenching rate of the HPCS-PQDs and concentration of Cr(VI) from 0.8 to 400 µM, with a limit of detection (LOD) of 0.27 µM. The fluorescence quenching mechanism is the static quenching and internal filtration effect caused by HPCS-PQDs forming a non-fluorescent ground-state complex with Cr(VI). The sensor can not only be used to detect Cr(VI) in water samples with high accuracy but can also be prepared as a test paper for the detection for Cr(VI).
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Affiliation(s)
- Dangge Gao
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China.
- National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China.
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an, 710021, Shaanxi, China.
| | - Ailin Zhang
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China
- National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an, 710021, Shaanxi, China
| | - Bin Lyu
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China.
- National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China.
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an, 710021, Shaanxi, China.
| | - Jianzhong Ma
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China.
- National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, China.
- Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an, 710021, Shaanxi, China.
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Lan J, Wei Z, Lu YR, Chen D, Zhao S, Chan TS, Tan Y. Efficient electrosynthesis of formamide from carbon monoxide and nitrite on a Ru-dispersed Cu nanocluster catalyst. Nat Commun 2023; 14:2870. [PMID: 37208321 DOI: 10.1038/s41467-023-38603-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 05/10/2023] [Indexed: 05/21/2023] Open
Abstract
Conversion into high-value-added organic nitrogen compounds through electrochemical C-N coupling reactions under ambient conditions is regarded as a sustainable development strategy to achieve carbon neutrality and high-value utilization of harmful substances. Herein, we report an electrochemical process for selective synthesis of high-valued formamide from carbon monoxide and nitrite with a Ru1Cu single-atom alloy under ambient conditions, which achieves a high formamide selectivity with Faradaic efficiency of 45.65 ± 0.76% at -0.5 V vs. RHE. In situ X-ray absorption spectroscopy, coupled with in situ Raman spectroscopy and density functional theory calculations results reveal that the adjacent Ru-Cu dual active sites can spontaneously couple *CO and *NH2 intermediates to realize a critical C-N coupling reaction, enabling high-performance electrosynthesis of formamide. This work offers insight into the high-value formamide electrocatalysis through coupling CO and NO2- under ambient conditions, paving the way for the synthesis of more-sustainable and high-value chemical products.
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Affiliation(s)
- Jiao Lan
- College of Materials Science and Engineering, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan, 410082, China
| | - Zengxi Wei
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China
| | - Ying-Rui Lu
- National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan
| | - DeChao Chen
- College of Materials Science and Engineering, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan, 410082, China
| | - Shuangliang Zhao
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology and School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan.
| | - Yongwen Tan
- College of Materials Science and Engineering, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan, 410082, China.
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3
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Zhang C, Chen Y, Chen S, Guan X, Zhong Y, Yang Q. Occurrence, risk assessment, and in vitro and in vivo toxicity of antibiotics in surface water in China. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 255:114817. [PMID: 36963185 DOI: 10.1016/j.ecoenv.2023.114817] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 03/09/2023] [Accepted: 03/18/2023] [Indexed: 06/18/2023]
Abstract
Antibiotics have been widely detected in the water environment and thus pose a potential threat to human health. Although antibiotics have health-promoting properties, whether and how they affect health at environmental concentrations remains uncharacterised. We detected antibiotics in surface water and groundwater in China. Sulfonamides (851 ng/L) and tetracyclines (1322 ng/L) showed the highest concentrations in surface water, while the highest concentration of sulfonamides detected in groundwater was 250 ng/L. We analysed the distribution of four classes of antibiotics (sulfonamides, tetracyclines, macrolides, and quinolones) and evaluated the associated health risks in the surface water of seven cities. We found that antibiotic pollution caused health risks to the 0-3-months age group, but not to other age groups. We further demonstrated that simulated long-term exposure to environmental concentrations of antibiotics had concentration-dependent toxic effects on L-02 hepatocytes, affected cell proliferation, and induced oxidative damage and DNA damage. Chronic exposure to mixed sulfonamides affected growth, caused liver damage, and reduced the abundance of intestinal flora in mice. Under exposure to antibiotics, the abundance of Helicobacter pylori in the gut flora significantly increased and posed a health risk to humans. These results indicated that exposure to antibiotics at environmental concentrations can cause oxidative damage and inflammation both in vitro and in vivo. These findings add to the body of basic data on the distribution of antibiotics in the water environment, and provide a scientific basis for the evaluation of antibiotic toxicity.
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Affiliation(s)
- Cheng Zhang
- School of Public Health, Guangzhou Medical University, Guangzhou 511436, China
| | - Yuyang Chen
- School of Anesthesiology, Southern Medical University, Guangzhou 510515, China
| | - Sili Chen
- School of Public Health, Guangzhou Medical University, Guangzhou 511436, China
| | - Xinchao Guan
- School of Public Health, Guangzhou Medical University, Guangzhou 511436, China
| | - Yi Zhong
- Guangzhou Center for Disease Control and Prevention, Guangzhou 510440, China; Institute of Public Health, Guangzhou Medical University, Guangzhou 511436, China
| | - Qiaoyuan Yang
- School of Public Health, Guangzhou Medical University, Guangzhou 511436, China; Institute of Public Health, Guangzhou Medical University, Guangzhou 511436, China.
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4
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Nkansah MA, Korankye M, Darko G, Dodd M, Opoku F. Potential health risk and bio-accessibility of metal and minerals in saltpetre (a food additive). Heliyon 2023; 9:e13174. [PMID: 36873498 PMCID: PMC9976209 DOI: 10.1016/j.heliyon.2023.e13174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 01/19/2023] [Accepted: 01/20/2023] [Indexed: 01/26/2023] Open
Abstract
Food additives are used to enhance freshness, safety, appearance, flavour, and texture of food. Depending on the absorbed dose, exposure method, and length of exposure, heavy metals in diet may have a negative impact on human health. The X-Ray Fluorescence (XRF) Analyzer from Niton Thermo Scientific (Mobile Test S, NDTr-XL3t-86956, com 24) was used in this work to measure the heavy metal content in saltpetre, a food additive that mostly contains potassium nitrate. The average essential metal concentrations in the samples were determined to be 27044.27 ± 10905.18 mg kg-1, 24521.10 ± 6564.28 mg kg-1, 2418.33 ± 461.50 mg kg-1, and 4.615 ± 3.59 mg kg-1 for Ca, K, Fe and Zn respectively. Toxic metals (As, Pb) were present in the saltpetre samples at 4.13 ± 2.47 mg kg-1 and 2.11 ± 1.87 mg kg-1 average concentrations. No traces of mercury or cadmium were detected. Studies on exposure, health risks, and bio-accessibility identified arsenic as a significant risk factor for potential illnesses. The need to monitor heavy metal content of saltpetre and any potential health effects on consumers is brought to light by this study.
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Affiliation(s)
| | - Mavis Korankye
- Department of Chemistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Godfred Darko
- Department of Chemistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Matt Dodd
- School of Environment and Sustainability, Royal Roads University, Victoria, Canada
| | - Francis Opoku
- Department of Chemistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
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Ke Z, He D, Yan X, Hu W, Williams N, Kang H, Pan X, Huang J, Gu J, Xiao X. Selective NO x- Electroreduction to Ammonia on Isolated Ru Sites. ACS NANO 2023; 17:3483-3491. [PMID: 36745389 DOI: 10.1021/acsnano.2c09691] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Nitrate and nitrite (NOx-) are widespread contaminants in industrial wastewater and groundwater. Sustainable ammonia (NH3) production via NOx- electroreduction provides a prospective alternative to the energy-intensive industrialized Haber-Bosch process. However, selectively regulating the reaction pathway, which involves complicated electron/proton transfer, toward NH3 generation relies on the robust catalyst. A specific consideration in designing selective NOx--to-NH3 catalysts should meet the criteria to suppress competing hydrogen evolution and avoid the presence of neighboring active sites that are in favor of adverse N-N coupling. Nevertheless, efforts in this regard are still inadequate. Herein, we demonstrate that isolated ruthenium sites can selectively reduce NOx- into NH3, with maximal Faradaic efficiencies of 97.8% (NO2- reduction) and 72.8% (NO3- reduction) at -0.6 and -0.4 V, respectively. Density functional theory calculations simulated the reaction mechanisms and identified the *NO → *NOH as the potential rate-limiting step for NOx--to-NH3 conversion on single-atom Ru sites.
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Affiliation(s)
- Zunjian Ke
- Department of Physics, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan, Hubei 430072, China
| | - Dong He
- Department of Physics, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan, Hubei 430072, China
| | - Xingxu Yan
- Department of Materials Science and Engineering, University of California, Irvine, Irvine, California 92697, United States
| | - Wenhui Hu
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Nicholas Williams
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1030, United States
| | - Hongxing Kang
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1030, United States
| | - Xiaoqing Pan
- Department of Materials Science and Engineering, University of California, Irvine, Irvine, California 92697, United States
- Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697, United States
- Irvine Materials Research Institute, University of California, Irvine, Irvine, California 92697, United States
| | - Jier Huang
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Jing Gu
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, California 92182-1030, United States
| | - Xiangheng Xiao
- Department of Physics, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan, Hubei 430072, China
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6
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Li X, Li Z, Zhang L, Zhao D, Li J, Sun S, Xie L, Liu Q, Alshehri AA, Luo Y, Liao Y, Kong Q, Sun X. Ni nanoparticle-decorated biomass carbon for efficient electrocatalytic nitrite reduction to ammonia. NANOSCALE 2022; 14:13073-13077. [PMID: 36069959 DOI: 10.1039/d2nr03540e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Electrocatalytic nitrite (NO2-) reduction to ammonia (NH3) can not only synthesize value-added NH3, but also remove NO2- pollutants from the environment. However, the low efficiency of NO2--to-NH3 conversion hinders its applications. Here, Ni nanoparticle-decorated juncus-derived biomass carbon prepared at 800 °C (Ni@JBC-800) serves as an efficient catalyst for NH3 synthesis by selective electroreduction of NO2-. This catalyst shows a remarkable NH3 yield of 4117.3 μg h-1 mgcat.-1 and a large faradaic efficiency of 83.4% in an alkaline electrolyte. The catalytic mechanism is further investigated by theoretical calculations.
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Affiliation(s)
- Xiuhong Li
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, School of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, Sichuan, China.
| | - Zerong Li
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, School of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, Sichuan, China.
| | - Longcheng Zhang
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Donglin Zhao
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Jun Li
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Shengjun Sun
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Lisi Xie
- Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, China.
| | - Qian Liu
- Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, China.
| | - Abdulmohsen Ali Alshehri
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Yonglan Luo
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, School of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, Sichuan, China.
| | - Yunwen Liao
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, School of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, Sichuan, China.
| | - Qingquan Kong
- Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, China.
| | - Xuping Sun
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
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7
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Wang W, Tse ECM. Enhanced Nitrite Electrovalorization to Ammonia by NiFe Layered Double Hydroxide. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wanying Wang
- University of Hong Kong Department of Chemistry HONG KONG
| | - Edmund Chun Ming Tse
- University of Hong Kong Department of Chemistry Room 403Chong Yuet Ming Chemistry BuildingPokfulam Hong Kong SAR HONG KONG
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8
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Liu Q, Liu Q, Xie L, Yue L, Li T, Luo Y, Li N, Tang B, Yu L, Sun X. A 3D FeOOH nanotube array: an efficient catalyst for ammonia electrosynthesis by nitrite reduction. Chem Commun (Camb) 2022; 58:5160-5163. [PMID: 35385567 DOI: 10.1039/d2cc00611a] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Nitrite (NO2-) is a detrimental pollutant widely existing in groundwater sources, threatening public health. Electrocatalytic NO2- reduction settles the demand for removal of NO2- and is also promising for generating ammonia (NH3) at room temperature. A nanotube array directly grown on a current collector not only has a large surface area, but also exhibits improved structural stability and accelerated electron transport. Herein, a self-standing FeOOH nanotube array on carbon cloth (FeOOH NTA/CC) is proposed as a highly active electrocatalyst for NO2--to-NH3 conversion. As a 3D catalyst, the FeOOH NTA/CC is able to attain a surprising faradaic efficiency of 94.7% and a large NH3 yield of 11937 μg h-1 cm-2 in 0.1 M PBS (pH = 7.0) with 0.1 M NO2-. Furthermore, this catalyst also displays excellent durability in cyclic and long-term electrolysis tests.
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Affiliation(s)
- Qin Liu
- School of Materials and Chemical Engineering, Xi'an Technological University, Xian 710021, Shaanxi, China. .,Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Qian Liu
- Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, China.
| | - Lisi Xie
- Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, China.
| | - Luchao Yue
- School of Materials and Chemical Engineering, Xi'an Technological University, Xian 710021, Shaanxi, China.
| | - Tingshuai Li
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Yongsong Luo
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Na Li
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, Shandong, China
| | - Bo Tang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, Shandong, China
| | - Lingmin Yu
- School of Materials and Chemical Engineering, Xi'an Technological University, Xian 710021, Shaanxi, China.
| | - Xuping Sun
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China. .,College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, Shandong, China
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9
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Zhao D, Liang J, Li J, Zhang L, Dong K, Yue L, Luo Y, Ren Y, Liu Q, Hamdy MS, Li Q, Kong Q, Sun X. A TiO 2-x nanobelt array with oxygen vacancies: an efficient electrocatalyst toward nitrite conversion to ammonia. Chem Commun (Camb) 2022; 58:3669-3672. [PMID: 35224596 DOI: 10.1039/d2cc00856d] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Electrocatalytic nitrite reduction not only holds significant potential in the control of nitrite contamination in the natural environment, but also is an attractive approach for sustainable ammonia synthesis. In this communication, we report that a TiO2-x nanobelt array with oxygen vacancies on a titanium plate is able to convert nitrite into ammonia with a high faradaic efficiency of 92.7% and a large yield of 7898 μg h-1 cm-2 in alkaline solution. This monolithic catalyst also shows high durability with the maintenance of its catalytic activity for 12 h. Theoretical calculations further reveal the critical role of oxygen vacancies in nitrite electroreduction.
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Affiliation(s)
- Donglin Zhao
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, Sichuan, China.
| | - Jie Liang
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Jun Li
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Longcheng Zhang
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Kai Dong
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, Sichuan, China.
| | - Luchao Yue
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Yongsong Luo
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Yuchun Ren
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
| | - Qian Liu
- Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, China.
| | - Mohamed S Hamdy
- Catalysis Research Group (CRG), Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia
| | - Quan Li
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, Sichuan, China.
| | - Qingquan Kong
- Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, China.
| | - Xuping Sun
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China. .,College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, Shandong, China
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10
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Saalidong BM, Aram SA, Otu S, Lartey PO. Examining the dynamics of the relationship between water pH and other water quality parameters in ground and surface water systems. PLoS One 2022; 17:e0262117. [PMID: 35077475 PMCID: PMC8789185 DOI: 10.1371/journal.pone.0262117] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 12/17/2021] [Indexed: 02/08/2023] Open
Abstract
This study evaluated the relationship between water pH and the physicochemical properties of water while controlling for the influence of heavy metals and bacteriological factors using a nested logistic regression model. The study further sought to assess how these relationships are compared across confined water systems (ground water) and open water systems (surface water). Samples were collected from 100 groundwater and 132 surface water locations in the Tarkwa mining area. For the zero-order relationship in groundwater, EC, TDS, TSS, Ca, SO42-, total alkalinity, Zn, Mn, Cu, faecal and total coliform were more likely to predict optimal water pH. For surface water however, only TSS, turbidity, total alkalinity and Ca were significant predictors of optimal pH levels. At the multivariate level for groundwater, TDS, turbidity, total alkalinity and TSS were more likely to predict optimal water pH while EC, Mg, Mn and Zn were associated with non-optimal water pH. For the surface water system, turbidity, Ca, TSS, NO3, Mn and total coliform were associated with optimal water pH while SO42-, EC, Zn, Cu, and faecal coliform were associated with non-optimal water pH. The non-robustness of predictors in the surface water models were conspicuous. The results indicate that the relationship between water pH and other water quality parameters are different in different water systems and can be influenced by the presence of other parameters. Associations between parameters are steadier in groundwater systems due to its confined nature. Extraneous inputs and physical variations subject surface water to constant variations which reflected in the non-robustness of the predictors. However, the carbonate system was influential in how water quality parameters associate with one another in both ground and surface water systems. This study affirms that chemical constituents in natural water bodies react in the environment in far more complicated ways than if they were isolated and that the interaction between various parameters could predict the quality of water in a particular system.
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Affiliation(s)
- Benjamin M. Saalidong
- Department of Geosciences, Taiyuan University of Technology, Taiyuan, People’s Republic of China
| | - Simon Appah Aram
- College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan, People’s Republic of China
| | - Samuel Otu
- Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, NM, United States of America
| | - Patrick Osei Lartey
- Ministry of Education Key Laboratory of Interface and Engineering in Advanced Materials, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan, People’s Republic of China
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11
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Ranjbar F, Karrabi M, Danesh S, Gheibi M. Improvement of wastewater sludge dewatering using ferric chloride, aluminum sulfate, and calcium oxide (experimental investigation and descriptive statistical analysis). WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2021; 93:1138-1149. [PMID: 33522044 DOI: 10.1002/wer.1526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 01/19/2021] [Accepted: 01/21/2021] [Indexed: 06/12/2023]
Abstract
In this research, application of chemical conditioners for the conditioning of sludge and their effects on the improvement of sludge thickening of the wastewater treatment plant in the city of Bojnourd (Iran) is investigated. The concentration of chemical conditioners, pH and coagulation and flocculation time is from among the parameters studied in this research work. The results obtained indicate that sludge volume reduction for the chemical conditioners used, including Ferric Chloride (FeCl3 ), Aluminum Sulfate (Al2 (SO4 )3 ), and Calcium Oxide (CaO) are 41, 17, and 33 percent, respectively. The optimal concentration for FeCl3 , Al2 (SO4 )3, and CaO are 550, 1100, and 292 mg/L, respectively, and the optimal values of pH are 9, 7.5, and 10, respectively. The time to filtration (TTF) and reduction in sludge moisture content (SMC) for Ferric Chloride, Aluminum Sulfate, and Calcium Oxide are 45 s and 6.2%, 135 s and 3.3%, 190 s and 2.4% respectively. PRACTITIONER POINTS: Investigating the sludge conditioning by Ferric Chloride, Aluminum Sulfate, and Calcium Oxide. Determining the optimal concentration, pH, and coagulation/flocculation time. Calculating the time to filtration (TTF) and reduction in sludge moisture content (SMC). Predicting the settled sludge volume using descriptive statistical analysis.
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Affiliation(s)
- Flora Ranjbar
- Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohsen Karrabi
- Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Shahnaz Danesh
- Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohammad Gheibi
- Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
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12
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Li H, Yan C, Guo H, Shin K, Humphrey SM, Werth CJ, Henkelman G. CuxIr1–x Nanoalloy Catalysts Achieve Near 100% Selectivity for Aqueous Nitrite Reduction to NH3. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01604] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Hao Li
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
- The Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712, United States
| | - Chenxu Yan
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, 301 East Dean Keeton Street, Stop C1786, Austin, Texas 78712, United States
| | - Hongyu Guo
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
| | - Kihyun Shin
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
| | - Simon M. Humphrey
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
| | - Charles J. Werth
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, 301 East Dean Keeton Street, Stop C1786, Austin, Texas 78712, United States
| | - Graeme Henkelman
- Department of Chemistry, The University of Texas at Austin, 100 East 24th Street, Stop A1590, Austin, Texas 78712, United States
- The Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712, United States
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13
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Li H, Guo S, Shin K, Wong MS, Henkelman G. Design of a Pd–Au Nitrite Reduction Catalyst by Identifying and Optimizing Active Ensembles. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02182] [Citation(s) in RCA: 104] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hao Li
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712, United States
| | - Sujin Guo
- Department of Civil and Environmental Engineering, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Department of Chemical and Biomolecular Engineering, Department of Chemistry, and Department of Materials Science and Nano Engineering, Rice University, 6100 South Main Street, Houston, Texas 77005, United States
| | - Kihyun Shin
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712, United States
| | - Michael S. Wong
- Department of Civil and Environmental Engineering, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Department of Chemical and Biomolecular Engineering, Department of Chemistry, and Department of Materials Science and Nano Engineering, Rice University, 6100 South Main Street, Houston, Texas 77005, United States
| | - Graeme Henkelman
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712, United States
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14
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Burg A, Guttman J. Mitigation of downstream propagation of contaminated water in a carbonate aquifer - The northeastern Negev desert, Israel. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 654:550-562. [PMID: 30447594 DOI: 10.1016/j.scitotenv.2018.11.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 11/07/2018] [Accepted: 11/07/2018] [Indexed: 06/09/2023]
Abstract
Groundwater pollution in Israel mainly occurs in the populated urban areas. Yet, in the 90's a major salinization was identified in a deep well in the northeastern part of the Negev desert, and a trend of increasing salinity was recognized in an adjacent spring. Since then the salinity of the spring is on the rise reaching a rate of 21 mgCl/L per month. New geochemical data allows the identification of the source, composition and volume of the contaminant, as well as its dispersion in the aquifer. The source of the contamination is attributed to highly saline (~40,000 mgCl/L), acidic and trace elements-rich industrial wastewater that leaked from evaporation ponds and also drained through karstic sinkhole to the subsurface over a period of decades. The contamination is reflected by a sharp increase in the concentrations of most major elements and by a moderate increase in a few trace elements. The total waste water volume that leaked is assessed to be 75 MCM. The study reveals that most of the contaminated water is still far upstream of the natural outlet. Due to the specific geological configuration the highly contaminated groundwater is channeled into a narrow corridor of an elongated syncline. Unlike other similar contamination cases around the world, pumping along this syncline can reduce the flow of the contaminated water further downstream towards a region where it disperses. The study provides the decision makers with tools that can reduce the environmental hazard and enable development of water production in this arid region. The current research emphasizes the importance of a combined geological, hydrological and geochemical study of a contaminated aquifer to fully understand the flow regime and contamination process. Such studies are a crucial step before an optimal mitigation action can be undertaken to rehabilitate a contaminated aquifer.
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Affiliation(s)
- Avihu Burg
- Geological Survey of Israel, 30 Malkei Israel St., Jerusalem 9550161, Israel.
| | - Joseph Guttman
- Mekorot Water Company, 9 Lincoln St., Tel Aviv 6713402, Israel.
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15
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Alzate-Sánchez DM, Ling Y, Li C, Frank BP, Bleher R, Fairbrother DH, Helbling DE, Dichtel WR. β-Cyclodextrin Polymers on Microcrystalline Cellulose as a Granular Media for Organic Micropollutant Removal from Water. ACS APPLIED MATERIALS & INTERFACES 2019; 11:8089-8096. [PMID: 30715844 DOI: 10.1021/acsami.8b22100] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Organic contaminants at low concentrations, known as micropollutants, are a growing threat to water resources. Implementing novel adsorbents capable of removing micropollutants during packed-bed adsorption is desirable for rapid water purification and other efficient separations. We previously developed porous polymers based on cyclodextrins that demonstrated rapid uptake and high affinity for dozens of micropollutants (MPs) in batch experiments. However, these polymers are typically produced as powders with irregular particle size distributions in the range of tens of micrometers. In this powdered form, cyclodextrin polymers cannot be implemented in packed-bed adsorption processes because the variable particle sizes yield insufficient porosity packing and consequently generate high back-pressure. Here we demonstrate a facile approach to remove micropollutants from water in a continuous manner by polymerizing cyclodextrin polymer networks onto cellulose microcrystals to provide a core/shell structure. Batch adsorption experiments demonstrate rapid pollutant uptake and high accessibility of the cyclodextrins on the adsorbent. Similarly, column experiments demonstrate rapid uptake of a model pollutant with minimal back-pressure, demonstrating potential for use in packed-bed adsorption processes. Furthermore, the pollutant-saturated columns were regenerated using methanol and reused three times with almost no change in performance. Column experiments conducted with a mixture of 15 micropollutants at environmentally relevant concentrations demonstrated that removal was determined by the affinity of each micropollutant for cyclodextrin polymers. The cyclodextrin polymer grafted onto cellulose microcrystals is more resistant to both anaerobic and aerobic biodegradation as compared to cyclodextrins and unmodified cellulose crystals, presumably due to the aromatic cross-linkers, demonstrating persistence. Collectively, the findings from this study demonstrate a general strategy to incorporate novel cyclodextrin adsorbents onto cellulose substrates to enable rapid and efficient removal of micropollutants during packed-bed adsorption as well as their promising long-term stability and regeneration capabilities.
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Affiliation(s)
| | - Yuhan Ling
- School of Civil and Environmental Engineering , Cornell University , Ithaca , New York 14853 , United States
| | - Chenjun Li
- School of Civil and Environmental Engineering , Cornell University , Ithaca , New York 14853 , United States
| | - Benjamin P Frank
- Department of Chemistry , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | | | - D Howard Fairbrother
- Department of Chemistry , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Damian E Helbling
- School of Civil and Environmental Engineering , Cornell University , Ithaca , New York 14853 , United States
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16
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UV Sensitization of Nitrate and Sulfite: A Powerful Tool for Groundwater Remediation. ENVIRONMENTS 2018. [DOI: 10.3390/environments5110117] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Groundwater contamination by nitrate and organic chemicals (for example, 1,4-dioxane) is a growing worldwide concern. This work presents a new approach for simultaneously treating nitrate and 1,4-dioxane, which is based on the ultra-violet (UV) sensitization of nitrate and sulfite, and the production of reactive species. Specifically, water contaminated with nitrate and 1,4-dioxane is irradiated by a UV source (<250 nm) at relatively high doses, to sensitize in situ nitrate and generate OH•. This leads to the oxidation of 1,4-dioxane (and other organics) and the (undesired) production of nitrite as an intermediate. Subsequently, sulfite is added at an optimized time-point, and its UV sensitization produces hydrated electrons that react and reduces nitrite. Our results confirm the effectivity of the proposed treatment: UV irradiation of nitrate (at >5 mg N/L) efficiently degraded 1,4-dioxane, while producing nitrite at levels higher than its maximum contaminant level (MCL) of 1 mg N/L in drinking water. Adding sulfite to the process after 10 min of irradiation reduces the concentration of nitrite without affecting the degradation rate of 1,4-dioxane. The treated water contained elevated levels of sulfate; albeit at much lower concentration than its MCL. Treating water contaminated with nitrate and organic chemicals (often detected concomitantly) typically requires several expensive treatment processes. The proposed approach presents a cost-effective alternative, employing a single system for the treatment of nitrate and organic contaminants.
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17
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Bhandari RK, Deem SL, Holliday DK, Jandegian CM, Kassotis CD, Nagel SC, Tillitt DE, Vom Saal FS, Rosenfeld CS. Effects of the environmental estrogenic contaminants bisphenol A and 17α-ethinyl estradiol on sexual development and adult behaviors in aquatic wildlife species. Gen Comp Endocrinol 2015; 214:195-219. [PMID: 25277515 DOI: 10.1016/j.ygcen.2014.09.014] [Citation(s) in RCA: 167] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Revised: 08/08/2014] [Accepted: 09/20/2014] [Indexed: 12/12/2022]
Abstract
Endocrine disrupting chemicals (EDCs), including the mass-produced component of plastics, bisphenol A (BPA) are widely prevalent in aquatic and terrestrial habitats. Many aquatic species, such as fish, amphibians, aquatic reptiles and mammals, are exposed daily to high concentrations of BPA and ethinyl estradiol (EE2), estrogen in birth control pills. In this review, we will predominantly focus on BPA and EE2, well-described estrogenic EDCs. First, the evidence that BPA and EE2 are detectable in almost all bodies of water will be discussed. We will consider how BPA affects sexual and neural development in these species, as these effects have been the best characterized across taxa. For instance, such chemicals have been in many cases reported to cause sex-reversal of males to females. Even if these chemicals do not overtly alter the gonadal sex, there are indications that several EDCs might demasculinize male-specific behaviors that are essential for attracting a mate. In so doing, these chemicals may reduce the likelihood that these males reproduce. If exposed males do reproduce, the concern is that they will then be passing on compromised genetic fitness to their offspring and transmitting potential transgenerational effects through their sperm epigenome. We will thus consider how diverse epigenetic changes might be a unifying mechanism of how BPA and EE2 disrupt several processes across species. Such changes might also serve as universal species diagnostic biomarkers of BPA and other EDCs exposure. Lastly, the evidence that estrogenic EDCs-induced effects in aquatic species might translate to humans will be considered.
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Affiliation(s)
- Ramji K Bhandari
- Biological Sciences, University of Missouri, Columbia, MO 65211, USA; Columbia Environmental Research Center, U.S. Geological Survey, Columbia, MO 65201, USA
| | - Sharon L Deem
- Institute for Conservation Medicine, Saint Louis Zoo, Saint Louis, MO 63110, USA; Veterinary Clinical Medicine, University of Missouri, Columbia, MO 65211, USA
| | - Dawn K Holliday
- Department of Biology and Environmental Science, Westminster College, Fulton, MO 65251, USA; Department of Pathology and Anatomical Sciences, University of Missouri, Columbia, MO 65211, USA
| | - Caitlin M Jandegian
- Columbia Environmental Research Center, U.S. Geological Survey, Columbia, MO 65201, USA; Institute for Conservation Medicine, Saint Louis Zoo, Saint Louis, MO 63110, USA; Masters in Public Health Program, University of Missouri, Columbia, MO 65211, USA
| | | | - Susan C Nagel
- Biological Sciences, University of Missouri, Columbia, MO 65211, USA; Obstetrics, Gynecology, & Women's Health, University of Missouri, Columbia, MO 65211, USA
| | - Donald E Tillitt
- Columbia Environmental Research Center, U.S. Geological Survey, Columbia, MO 65201, USA
| | | | - Cheryl S Rosenfeld
- Biomedical Sciences, University of Missouri, Columbia, MO 65211, USA; Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, USA; Genetics Area Program Faculty Member, University of Missouri, Columbia, MO 65211, USA.
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18
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Govindhan M, Adhikari BR, Chen A. Nanomaterials-based electrochemical detection of chemical contaminants. RSC Adv 2014. [DOI: 10.1039/c4ra10399h] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Recent advances in the development of nanomaterials-based electrochemical sensors for environmental monitoring and food safety applications are assessed.
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Affiliation(s)
| | | | - Aicheng Chen
- Department of Chemistry
- Lakehead University
- Thunder Bay, Canada
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19
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An analytical solution to contaminant advection and dispersion through a GCL/AL liner system. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s11434-010-4039-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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20
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Zhang Y, Qiao ZA, Li Y, Liu Y, Huo Q. Cooperative adsorbent based on mesoporous SiO2 for organic pollutants in water. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12259b] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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21
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Mullins DE, Young RW, Palmer CP, Hamilton RL, Sherertz PC. Disposal of concentrated solutions of diazinon using organic absorption and chemical and microbial degradation. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/ps.2780250305] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Singh SB, Malamas MS, Hohman TC, Nilakantan R, Carper DA, Kitchen D. Molecular modeling of the aldose reductase-inhibitor complex based on the X-ray crystal structure and studies with single-site-directed mutants. J Med Chem 2000; 43:1062-70. [PMID: 10737739 DOI: 10.1021/jm990168z] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aldose reductase (AR) has been implicated in the etiology of the secondary complications of diabetes. This enzyme catalyzes the reduction of glucose to sorbitol using nicotinamide adenine dinucleotide phosphate as an essential cofactor. AR has been localized at the sites of tissue damage, and inhibitors of this enzyme prevent the development of neuropathy, nephropathy, retinopathy, and cataract formation in animal models of diabetes. The crystal structure of AR complexed with zopolrestat, a potent inhibitor of AR, has been described.(1) We have generated a model of the AR-inhibitor complex based on the reported Calpha coordinates of the protein and results of a structure-activity relationship study using four structurally distinct classes of inhibitors, recombinant human AR, and four single-site-directed mutants of this enzyme. The effects of the site-directed mutations on residues within the active site of the enzyme were evaluated by average interaction energy calculations and by calculations of carbon atom surface area changes. These values correlated well with the IC(50) values for zopolrestat with the wild-type and mutant enzymes, validating the model. On the basis of the zopolrestat-binding model, we have proposed binding models for 10 other AR inhibitors. Our models have enabled us to gain a qualitative understanding of the binding domains of the enzyme and how different inhibitors impact the size and shape of the binding site.
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Affiliation(s)
- S B Singh
- Wyeth Ayerst Research, CN 8000, Princeton, New Jersey 08543-8000, National Eye Institute, NIH, Bethesda, Maryland 20892, USA.
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23
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Kiefer AM, Kast SM, Wasielewski MR, Laukenmann K, Kothe G. Exploring the Structure of a Photosynthetic Model by Quantum-Chemical Calculations and Time-Resolved Q-Band Electron Paramagnetic Resonance. J Am Chem Soc 1999. [DOI: 10.1021/ja981930+] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Tezcan FA, Winkler JR, Gray HB. Effects of Ligation and Folding on Reduction Potentials of Heme Proteins. J Am Chem Soc 1998. [DOI: 10.1021/ja982536e] [Citation(s) in RCA: 248] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- F. Akif Tezcan
- Contribution from the Beckman Institute, California Institute of Technology, Pasadena, California 91125
| | - Jay R. Winkler
- Contribution from the Beckman Institute, California Institute of Technology, Pasadena, California 91125
| | - Harry B. Gray
- Contribution from the Beckman Institute, California Institute of Technology, Pasadena, California 91125
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25
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Wu Q, Gao J, Joseph-McCarthy D, Sigal GB, Bruce JE, Whitesides GM, Smith RD. Carbonic Anhydrase-Inhibitor Binding: From Solution to the Gas Phase. J Am Chem Soc 1997. [DOI: 10.1021/ja9630250] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Oh YS, Shareefdeen Z, Baltzis BC, Bartha R. Interactions between benzene, toluene, and p-xylene (BTX) during their biodegradation. Biotechnol Bioeng 1994; 44:533-8. [DOI: 10.1002/bit.260440417] [Citation(s) in RCA: 129] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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27
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Dobbins DC, Aelion CM, Pfaender F. Subsurface, terrestrial microbial ecology and biodegradation of organic chemicals: A review. ACTA ACUST UNITED AC 1992. [DOI: 10.1080/10643389209388430] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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28
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29
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Abstract
A bioremediation treatment that consisted of liming, fertilization, and tilling was evaluated on the laboratory scale for its effectiveness in cleaning up a sand, a loam, and a clay loam contaminated at 50 to 135 mg g of soil
−1
by gasoline, jet fuel, heating oil, diesel oil, or bunker C. Experimental variables included incubation temperatures of 17, 27, and 37°C; no treatment; bioremediation treatment; and poisoned evaporation controls. Hydrocarbon residues were determined by quantitative gas chromatography or, in the case of bunker C, by residual weight determination. Four-point depletion curves were obtained for the described experimental variables. In all cases, the disappearance of hydrocarbons was maximal at 27°C and in response to bioremediation treatment. Poisoned evaporation controls underestimated the true biodegradation contribution, but nevertheless, they showed that biodegradation makes only a modest contribution to gasoline disappearance from soil. Bunker C was found to be structurally recalcitrant, with close to 80% persisting after 1 year of incubation. The three medium distillates, jet fuel, heating oil, and diesel oil, increased in persistence in the listed order but responded well to bioremediation treatment under all test conditions. With bioremediation treatment, it should be possible to reduce hydrocarbons to insignificant levels in contaminated soils within one growing season.
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Affiliation(s)
- H G Song
- Department of Biochemistry and Microbiology, Cook College, Rutgers University, New Brunswick, New Jersey 08903-0231
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30
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Breen A, Stahl DA, Flesher B, Sayler G. Characterization ofPseudomonas geomorphus: A novel groundwater bacterium. MICROBIAL ECOLOGY 1989; 18:221-233. [PMID: 24196203 DOI: 10.1007/bf02075810] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Strain ABS10, a Gram-negative, pleomorphic bacterium isolated from a pristine aquifer in Ada, Oklahoma, was studied as a candidate for the introduction and expression of plasmid DNA in a native ground water isolate. This organism was originally typed as anArthrobacter sp. due to its morphological phase change and Gram-variable reaction upon Gram staining. The fatty acid methyl ester profile of ABS10 revealed a high similarity withPseudomonas putida. DNA-DNA hybridization showed 81% homology between ABS10 andP. putida. 16S rRNA sequence analysis showed ABS 10 to be a member of the Gamma division of the purple photosynthetic bacteria. The organism has been designatedPseudomonas geomorphus due to its isolation from a subterranean sample and the morphological phase change from rods in young cultures to cocci in older cultures. The broad host range plasmid RP4 was introduced into ABS10 and stably maintained, indicating that RP4 may serve as a vehicle for the introduction of catabolic genes into this organism.
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Affiliation(s)
- A Breen
- Department of Microbiology, University of Tennessee, 37919, Knoxville, Tennessee, USA
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31
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FLIERMANS C. Microbial Life in the Terrestrial Subsurface of Southeastern Coastal Plain Sediments. ACTA ACUST UNITED AC 1989. [DOI: 10.1089/hwm.1989.6.155] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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32
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Cochran JW, Yates MV, Henson J. A modified purge-and-trap/gas chromatography method for analysis of volatile halocarbons in microbiological degradation studies. METHODS IN MICROBIOLOGY 1988. [DOI: 10.1016/0167-7012(88)90033-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Shannon MJ, Bartha R. Immobilization of Leachable Toxic Soil Pollutants by Using Oxidative Enzymes. Appl Environ Microbiol 1988; 54:1719-23. [PMID: 16347683 PMCID: PMC202735 DOI: 10.1128/aem.54.7.1719-1723.1988] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Screening of leachable toxic chemicals in a horseradish peroxidase-H
2
O
2
immobilization system established that immobilization was promising for most phenolic pollutants but not for benzoic acid, 2,6-dinitrocresol, or dibutyl phthalate. The treatment did not mobilize inherently nonmobile pollutants such as anilines and benzo[
a
]pyrene. In a separate study, an extracellular laccase in the culture filtrate of
Geotrichum candidum
was selected from five fungal enzymes evaluated as a cost-effective substitute for horseradish peroxidase. This enzyme was used in demonstrating the immobilization and subsequent fate of
14
C-labeled 4-methylphenol and 2,4-dichlorophenol in soil columns. When applied to Lakewood sand, 98.1% of 4-methylphenol was leached through with distilled water. Two days after immobilization treatment with the
G. candidum
culture filtrate, only 9.1% of the added 4-methylphenol was leached with the same volume of water. Of the more refractory test pollutant 2,4-dichlorophenol, 91.6% had leached at time zero and 48.5% had leached 1 day after the immobilization treatment. However, 2 weeks after immobilization, only 12.0% of the 2,4-dichlorophenol was leached compared with 61.7% from the control column that received no immobilization treatment. No remobilization of the bound pollutants was detected during 3- and 4-week incubation periods. Enzymatic immobilization of phenolic contaminants in soil appears to be a promising technique for the reduction of groundwater pollution by such substances.
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Affiliation(s)
- M J Shannon
- Department of Biochemistry and Microbiology, Cook College, Rutgers University, New Brunswick, New Jersey 08903
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34
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Dobbins DC, Pfaender FK. Methodology for assessing respiration and cellular incorporation of radiolabeled substrates by soil microbial communities. MICROBIAL ECOLOGY 1988; 15:257-273. [PMID: 24201405 DOI: 10.1007/bf02012641] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A method is described for determining biodegradation kinetics of both naturally occurring and xenobiotic compounds in surface and sub-surface soil samples. The method measures both respiration and uptake into cellular biomass of(14)C-labeled substrates. The estimation of biomass incorporation entailed removal of cells from soil particles by washing the soil with a polyvinyl-pyrrolidone/pyrophosphate solution and H2O2. After separation of the cells and the soil particles by centrifugation, the cells were trapped on membrane filters for liquid scintillation counting. Mass balances were easily obtained. The technique was used to measure metabolic activity in soil profiles, including unsaturated and saturated zones. First order rate constants (K1) were in the range of 10(-3)-10(-2) hour(-1) for amino acid metabolism and 10(-5)-10(-4) hour(-1) for m-cresol metabolism. Saturation kinetics were observed for amino acids and m-cresol. m-Cresol K1 values for uptake often exceeded those for respiration by greater than a factor of ten. Vmax values were low (amino acids, 10(1)-10(2) ng g(-1) hour(-1); m-cresol, 10(-1) ng g(-1) hour(-1)), whereas Km values were quite high (amino acids, 10(3)-10(4) ng g(-1); m-cresol 10(3)-10(5) ng g(-1)). Saturation was not observed in many horizons even at 10(5) ng g(-1) dry soil. Frequently, respiration obeyed saturation kinetics whereas uptake was first order. It is concluded that measuring only kinetics of respiration may lead to severe underestimations of biodegradation rates.
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Affiliation(s)
- D C Dobbins
- Department of Environmental Sciences and Engineering, School of Public Health, University of North Carolina, 27514, Chapel Hill, North Carolina, USA
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35
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Michael Henson J, Yates M, Cochran J, Shackleford D. Microbial removal of halogenated methanes, ethanes, and ethylenes in an aerobic soil exposed to methane. FEMS Microbiol Lett 1988. [DOI: 10.1111/j.1574-6968.1988.tb02664.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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36
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Landrigan PJ, Kominsky JR, Stein GF, Ruhe RL, Watanabe AS. Common-source community and industrial exposure to trichloroethylene. ARCHIVES OF ENVIRONMENTAL HEALTH 1987; 42:327-32. [PMID: 3439809 DOI: 10.1080/00039896.1987.9934354] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
In July 1979, 1,900 gallons of trichloroethylene (TCE) were released into ground and surface water from a pipe manufacturing plant in Montgomery County, Pennsylvania. To evaluate community and occupational exposure to TCE, we conducted environmental and medical surveys. In well water samples obtained in August 1979 within 1 km of the factory, TCE concentrations ranged to 183,000 parts per billion (ppb); EPA's proposed guideline for TCE in drinking water is 5 ppb. Levels of TCE declined with distance from the plant and decreased in the months following the spill. However, lower level TCE contamination was widespread and persistent, suggesting multiple releases. Within the plant, mean time-weighted occupational exposure to TCE of degreaser operators was 205 mg/m3; the recommended time-weighted exposure limit is 135 mg/m3. Mean short-term exposure was 1,084 mg/m3; the recommended short-term limit is 535 mg/m3. Seven of 9 exposed workers reported drowsiness, dizziness, or mental confusion. In exposed workers, mean urinary excretion of TCE metabolites rose from 298 micrograms/L pre-shift to 480 micrograms/L post-shift. On re-evaluation of the factory following improvements in ventilation and work practices, mean time-weighted occupational exposure to TCE had decreased to 84 mg/m3 and short-term exposure to 400 mg/m3; symptom frequency and concentrations of urinary TCE metabolites also were reduced. This episode demonstrates that community and occupational exposure to chemical toxins may share a common origin.
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Affiliation(s)
- P J Landrigan
- Division of Environmental and Occupational Medicine, Mt. Sinai School of Medicine, New York, New York
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Halvorson DA, Kelleher CJ, Senne DA. Epizootiology of avian influenza: effect of season on incidence in sentinel ducks and domestic turkeys in Minnesota. Appl Environ Microbiol 1985; 49:914-9. [PMID: 4004223 PMCID: PMC238469 DOI: 10.1128/aem.49.4.914-919.1985] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Sentinel ducks and domestic turkey flocks were monitored for influenza infection during a 4-year period. The onset of infection among ducks was similar each year, occurring in late July or early August. Influenza in turkeys was also shown to be seasonal, but the usual onset was 6 to 8 weeks after the detection of influenza in sentinel ducks. Possible explanations for the delayed infection in turkeys are (i) increased waterfowl activity associated with fledging and congregating in late summer and early fall; (ii) vectors transmitting virus from the waterfowl habitat to poultry farms; (iii) cooler environmental temperature, allowing prolonged virus viability; (iv) cooler surface water temperature, allowing prolonged virus viability; (v) groundwater contamination from contaminated surface water; and (vi) virus adaptation in domestic turkeys before infection is detected. We conclude that ducks are not only a natural reservoir of influenza but also have a seasonal infection that appears to be related to seasonal influenza outbreaks in domestic turkeys in Minnesota. However, only some influenza A virus isolates circulating among waterfowl at any given time appear capable of causing detectable infection in turkeys. It is speculated that the seasonal infection in migratory waterfowl may also be related to seasonal influenza infections in other species including humans.
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