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Mei A, Xu Z, Wang X, Liu Y, Chen J, Fan J, Shi Q. Photocatalytic materials modified with carbon quantum dots for the degradation of organic pollutants under visible light: A review. ENVIRONMENTAL RESEARCH 2022; 214:114160. [PMID: 36027960 DOI: 10.1016/j.envres.2022.114160] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 08/15/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
In recent years, carbon quantum dots (CQDs) have received widespread attention owing to their non-toxicity, sustainability, excellent photostability, and intrinsic photoluminescence properties. In particular, CQDs have attracted considerable interest for visible-light-driven photocatalysis because of their excellent electron transfer characteristics and high light capture efficiency. Many studies have reported CQDs/photocatalyst composite systems constructed to make full use of the solar spectrum, improving the ability of photocatalytic materials to degrade organic pollutants. Here, we review the recent research on CQDs-based photocatalysts, and their ability to remove environmental pollutants, with a special emphasis on degradation mechanisms. Several improvements in the catalytic response of CQDs to visible light are also included. In addition, we discuss the aspects that should be considered to construct composite materials based on CQD characteristics and the potential applications of CQD-based photocatalysts for efficient utilization of visible light.
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Affiliation(s)
- Aoxue Mei
- College of Ecology and Environment, Xinjiang University, Shengli Road, Tianshan District, Urumqi, 830046, China
| | - Zijun Xu
- College of Ecology and Environment, Xinjiang University, Shengli Road, Tianshan District, Urumqi, 830046, China; College of Resources and Environment Sciences, China Agricultural University, Beijing, 100193, PR China.
| | - Xiyuan Wang
- College of Ecology and Environment, Xinjiang University, Shengli Road, Tianshan District, Urumqi, 830046, China.
| | - Yuying Liu
- College of Ecology and Environment, Xinjiang University, Shengli Road, Tianshan District, Urumqi, 830046, China
| | - Jiao Chen
- College of Ecology and Environment, Xinjiang University, Shengli Road, Tianshan District, Urumqi, 830046, China
| | - Jingbiao Fan
- College of Resources and Environment Sciences, China Agricultural University, Beijing, 100193, PR China
| | - Qingdong Shi
- College of Ecology and Environment, Xinjiang University, Shengli Road, Tianshan District, Urumqi, 830046, China
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DNA dyes: toxicity, remediation strategies and alternatives. Folia Microbiol (Praha) 2022; 67:555-571. [PMID: 35292916 DOI: 10.1007/s12223-022-00963-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Accepted: 03/08/2022] [Indexed: 11/04/2022]
Abstract
Release of untreated effluent from processing or manufacturing industries and other commercial premises into water bodies is a major threat to environment and human health. In this regard, the effluent generated from laboratories and other research facilities is of great concern. Among other harmful chemicals, the effluent is rich in toxic organic dyes, which get exposed to the environment and pose serious health risk. The dyes used in nucleic acid analysis specially the DNA dyes are known for their teratogenicity and mutagenic potential, which mainly depends upon the organism and circumstances under which it is exposed. Among animals and humans, exposure to theses dyes may lead to irritation in mouth, eyes and respiratory tract and many other possible effects which are yet to be explored. To overcome these problems, dyes present in the effluents from laboratories must be degraded to non-toxic forms. Various strategies have been proposed and investigated for degradation and remediation of contaminated laboratory effluent. As a modern and cost-effective technique, biodegradation using microbes and plants is potentially eco-friendly and sustainable technique for detoxifying these dyes. In this article, we have discussed and reviewed the structure, properties and toxicity profile of prominent nucleic acid dyes, along with the strategies of remediation of laboratory effluents contaminated with these dyes. In addition, we have also discussed the feasibility and limitations of these remediation strategies and identified research gaps that can help researchers to explore more effective solutions to manage this area of great concern. We have also reviewed various less toxic alternatives of these common as safer options of these dyes.
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Xiang Y, Jiang L, Zhou Y, Luo Z, Zhi D, Yang J, Lam SS. Microplastics and environmental pollutants: Key interaction and toxicology in aquatic and soil environments. JOURNAL OF HAZARDOUS MATERIALS 2022; 422:126843. [PMID: 34419846 DOI: 10.1016/j.jhazmat.2021.126843] [Citation(s) in RCA: 145] [Impact Index Per Article: 72.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 07/28/2021] [Accepted: 08/04/2021] [Indexed: 05/27/2023]
Abstract
Nowadays, a growing number of microplastics are released into the environment due to the extensive use and inappropriate management of plastic products. With the increasing body of evidence about the pollution and hazards of microplastics, microplastics have drawn major attention from governments and the scientific community. As a kind of emerging and persistent environmental pollutants, microplastics have recently been detected on a variety of substrates in the world. Therefore, this paper reviews the recent progress in identifying the sources of microplastics in soil, water, and atmosphere and describing the transport and fate of microplastics in the terrestrial, aquatic and atmospheric ecosystems for revealing the circulation of microplastics in the ecosystem. In addition, considering the persistence of microplastics, this study elucidates the interactions of microplastics with other pollutants in the environment (i.e., organic pollutants, heavy metals) with emphasis on toxicity and accumulation, providing a novel insight into the ecological risks of microplastics in the environment. The negative impacts of microplastics on organisms and environmental health are also reviewed to reveal the environmental hazards of microplastics. The knowledge gaps and key research priorities of microplastics are identified to better understand and mitigate the environmental risks of microplastics.
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Affiliation(s)
- Yujia Xiang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Li Jiang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Yaoyu Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.
| | - Zirui Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Dan Zhi
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Jian Yang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Su Shiung Lam
- Pyrolysis Technology Research Group, Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia
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Park JH, Yun JJ, Kang SW, Kim SH, Cho JS, Wang JJ, Seo DC. Removal of potentially toxic metal by biochar derived from rendered solid residue with high content of protein and bone tissue. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 208:111690. [PMID: 33396022 DOI: 10.1016/j.ecoenv.2020.111690] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 11/15/2020] [Accepted: 11/17/2020] [Indexed: 06/12/2023]
Abstract
The purpose of this study was to produce rendering animal carcass residue char (RACR-C) by pyrolyzing the solid residues of low-recyclable rendered pig carcasses and to evaluate their cadmium (Cd) adsorption characteristics and mechanisms. As the pyrolysis temperature increased, the inorganic content of RACR-C increased, while the carbon content decreased. In particular, the surface structure and chemistry of RACR-Cs prepared at different pyrolysis temperatures were well described by SEM-EDS, XRD, XRF, TGA, and FTIR. The Cd adsorption characteristics of RACR-C were in good agreement with the Langmuir isotherm and pseudo-second-order models, and the Cd adsorption capacities of RACR-Cs prepared at various pyrolysis temperatures were in the order of RACR-C500 (73.5 mg/g)> RACR-C600 (53.8 mg/g)> RACR-C400 (41.5 mg/g) " RACR-C250 (15.9 mg/g). The intraparticle diffusion model suggested that the adsorption of Cd by RACR-C is greatly influenced by internal diffusion as well as external boundary. Since the Cd adsorption capacity of RACR-C is greatly influenced by the initial dosage, pH, and co-existing metals, it is necessary to manage these influencing factors when treating wastewater containing heavy metals. Our results suggest that Cd adsorption by RACR-C is a complex adsorption phenomenon by various mechanisms such as adsorption by functional group (C˭C and C-O), precipitation of Cd-P and ion exchange reaction by exchangeable cation occurring rather than by a single specific mechanism.
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Affiliation(s)
- Jong-Hwan Park
- Department of Agricultural Chemistry and Food Science & Technology (Institute of Agriculture and Life Science), Gyeongsang National University, Jinju 52828, South Korea
| | - Jin-Ju Yun
- Department of Bio-Environmental Sciences, Sunchon National University, Suncheon 57922, South Korea
| | - Se-Won Kang
- Department of Bio-Environmental Sciences, Sunchon National University, Suncheon 57922, South Korea
| | - Seong-Heon Kim
- Soil and Fertilizer division, National Institute of agricultural Sciences, Wanju 55365, South Korea
| | - Ju-Sik Cho
- Department of Bio-Environmental Sciences, Sunchon National University, Suncheon 57922, South Korea
| | - Jim J Wang
- School of Plant, Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
| | - Dong-Cheol Seo
- Department of Agricultural Chemistry and Food Science & Technology (Institute of Agriculture and Life Science), Gyeongsang National University, Jinju 52828, South Korea.
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Cheng Z, Chen Q, Pontius FW, Gao X, Tan Y, Ma Y, Shen Z. Two new predictors combined with quantum chemical parameters for the selection of oxidants and degradation of organic contaminants: A QSAR modeling study. CHEMOSPHERE 2020; 240:124928. [PMID: 31563101 DOI: 10.1016/j.chemosphere.2019.124928] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Revised: 09/03/2019] [Accepted: 09/20/2019] [Indexed: 06/10/2023]
Abstract
Oxidation is an attractive treatment method to effectively remove organic contaminants in water. In this study, degradation of 30 organic compounds in different oxidation systems was evaluated, including oxygen (O2), hydrogen peroxide (H2O2), ozone (O3) and hydroxyl radical (HO). First, a quantitative structure-activity relationship (QSAR) model for oxidation-reduction potentials (ORPs) of organics was developed and exhibited a good performance to predict ORP values of organics with evaluation indices of squared correlation coefficient (R2) = 0.866, internal validation (q2) = 0.811 and external validation (Qext2) = 0.669. Four quantum parameters, including f(+)n, f(-)n, EHOMO and EB3LYP dominate the ORP values. Subsequently, a relationship between reaction rates (k) and the difference of ORP for oxidants and organics (ΔEoxi-org) was established, however, which was limited (R2= 0.697). Therefore, two new predictors (slopes and intercepts) are proposed based on the linear relationships between k values and ORPs of oxidants. These new predictors can be applied to estimate the reaction rates and minimum oxidation potential for organic compounds. Afterwards, to express the two predictors, QSAR models were established. The two optimal QSAR models fitted very well with experimental values and were demonstrated to be stable and accurate based on R2 (0.982 and 0.965), q2 (0.950 and 0.950) and Qext2 (0.985 and 0.989). BOx, q(H)+ and q(C)x were main factors influencing the slopes and intercepts. This study developed methods to predict ORPs of organics and established two new predictors to estimate the reaction rates undergoing different oxidation processes, offering new insights into the oxidant selection.
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Affiliation(s)
- Zhiwen Cheng
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, PR China
| | - Qincheng Chen
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, PR China
| | - Frederick W Pontius
- Department of Civil Engineering and Construction Management, Gordon and Jill Bourns College of Engineering, California Baptist University, Riverside, CA, 92507, USA
| | - Xiaoping Gao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, PR China
| | - Yujia Tan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, PR China
| | - Yuning Ma
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, PR China
| | - Zhemin Shen
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.
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Zhu D, Zhou Q. Action and mechanism of semiconductor photocatalysis on degradation of organic pollutants in water treatment: A review. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.enmm.2019.100255] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Huang Y, Li J, Yang Y, Yuan H, Wei Q, Liu X, Zhao Y, Ni C. Characterization of enzyme-immobilized catalytic support and its exploitation for the degradation of methoxychlor in simulated polluted soils. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:28328-28340. [PMID: 31372950 DOI: 10.1007/s11356-019-05937-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 07/11/2019] [Indexed: 06/10/2023]
Abstract
Chiral mesoporous silica (SiO2) with helical structure was synthesized by using anionic surfactants as template. Pre-prepared graphene oxide (GO) was then loaded onto SiO2 to synthesize composite carrier chial-meso-SiO2@GO for the immobilization of laccase. The enzyme activity, thermostability, acid stability, and repeatability of the immobilized enzyme were significantly improved after immobilization. The chial-meso-SiO2@GO-immobilized laccase was then used for the degradation of MXC in aqueous phase. The degradation conditions, including temperature, time, pH, MXC concentration, and the dose of immobilized enzyme for cellulosic hydrolysis, were optimized. The optimum conditions for degradation of methoxychlor were selected as pH 4.5, MXC concentration 30 mg/L, immobilized enzyme dose 0.1 g, the maximum MXC removal of over 85% and the maximum degradation rate of 50.75% were achieved after degradation time of six h at temperature of 45 °C. In addition, the immobilized cellulase was added into the immobilized laccase system to form chial-meso-SiO2@GO-immobilized compound enzyme with the maximum MXC degradation rate of 59.58%, higher than that of 50.75% by immobilized laccase. An assessment was made for the effect of chial-meso-SiO2@GO-immobilized compound enzyme on the degradation of MXC in soil phase. For three contaminated soils with MXC concentration of 25 mg/kg, 50 mg/kg, and 100 mg/kg, the MXC removals were 93.0%, 85.8%, and 65.1%, respectively. According to the GC-MS analyses, it was inferred that chial-meso-SiO2@GO-immobilized compound enzyme had a different degradation route with that of chial-meso-SiO2@GO-immobilized laccase. The hydrolysis by immobilized cellulase might attack at a weak location of the MXC molecule with its free radical OH and ultimately removed three chlorine atoms from MXC molecule, leading to generating small molecular amount of degradation product.
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Affiliation(s)
- Yan Huang
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China
| | - Jie Li
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China
| | - Yuxiang Yang
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China.
- Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA.
| | - Hongming Yuan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, 130012, China
| | - Qinmei Wei
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China
| | - Xiangnong Liu
- Analysis Test Center, Yangzhou University, Yangzhou, 225009, China
| | - Yi Zhao
- School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237, China
| | - Chaoying Ni
- Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA.
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Park JH, Wang JJ, Xiao R, Zhou B, Delaune RD, Seo DC. Effect of pyrolysis temperature on phosphate adsorption characteristics and mechanisms of crawfish char. J Colloid Interface Sci 2018; 525:143-151. [DOI: 10.1016/j.jcis.2018.04.078] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 03/26/2018] [Accepted: 04/19/2018] [Indexed: 11/16/2022]
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Lin D, Huang Y, Yang Y, Long X, Qin W, Chen H, Zhang Q, Wu Z, Li S, Wu D, Hu L, Zhang X. Preparation and Characterization of Highly Ordered Mercapto-Modified Bridged Silsesquioxane for Removing Ammonia-Nitrogen from Water. Polymers (Basel) 2018; 10:E819. [PMID: 30960744 PMCID: PMC6403600 DOI: 10.3390/polym10080819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 07/19/2018] [Accepted: 07/19/2018] [Indexed: 11/16/2022] Open
Abstract
In acidic conditions, mesoporous molecular sieves SBA-15 and SBA-15-SH were synthesized. Structural characterization was carried out by powder X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), 13C CP MAS-NMR, 29Si CP MAS-NMR and nitrogen adsorption⁻desorption (BET). The results showed that in SBA-15-SH, the direct synthesis method made the absorption peak intensity weaker than that of SBA-15, while the post-grafted peak intensity did not change. Their spectra were different due to the C-H stretching bands of Si-O-Si and propyl groups. But their structure was still evenly distributed and was still hexangular mesoporous structure. Their pore size increased, and the H-SBA-15-SH had larger pore size. The adsorption of ammonia-nitrogen by molecular sieve was affected by the relative pressure and the concentration of ammonia-nitrogen, in which the adsorption capacity of G-SBA-15-SH was the largest and the adsorption capacity of SBA-15 was the smallest.
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Affiliation(s)
- Derong Lin
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Yichen Huang
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Yuanmeng Yang
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Xiaomei Long
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Wen Qin
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Hong Chen
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Qing Zhang
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Zhijun Wu
- School of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya'an 625014, China.
| | - Suqing Li
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Dingtao Wu
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Lijiang Hu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Xingwen Zhang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
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Lin D, Ji R, Wang D, Xiao M, Zhao J, Zou J, Li Y, Qin T, Xing B, Chen Y, Liu P, Wu Z, Wang L, Zhang Q, Chen H, Qin W, Wu D, Liu Y, Liu Y, Li S. The research progress in mechanism and influence of biosorption between lactic acid bacteria and Pb(II): A review. Crit Rev Food Sci Nutr 2017; 59:395-410. [DOI: 10.1080/10408398.2017.1374241] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Derong Lin
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, USA
| | - Ran Ji
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Dan Wang
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Mengshi Xiao
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Jingjing Zhao
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Jinpeng Zou
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Yutong Li
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Tao Qin
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, USA
| | - Yuan Chen
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Peng Liu
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Zhijun Wu
- College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya'an, China
| | - Lilin Wang
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Qing Zhang
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Hong Chen
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Wen Qin
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Dingtao Wu
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Yuntao Liu
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Yaowen Liu
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Suqing Li
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan, China
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Alneyadi AH, Shah I, AbuQamar SF, Ashraf SS. Differential Degradation and Detoxification of an Aromatic Pollutant by Two Different Peroxidases. Biomolecules 2017; 7:E31. [PMID: 28335468 PMCID: PMC5372743 DOI: 10.3390/biom7010031] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 03/04/2017] [Accepted: 03/13/2017] [Indexed: 12/29/2022] Open
Abstract
Enzymatic degradation of organic pollutants is a new and promising remediation approach. Peroxidases are one of the most commonly used classes of enzymes to degrade organic pollutants. However, it is generally assumed that all peroxidases behave similarly and produce similar degradation products. In this study, we conducted detailed studies of the degradation of a model aromatic pollutant, Sulforhodamine B dye (SRB dye), using two peroxidases-soybean peroxidase (SBP) and chloroperoxidase (CPO). Our results show that these two related enzymes had different optimum conditions (pH, temperature, H₂O₂ concentration, etc.) for efficiently degrading SRB dye. High-performance liquid chromatography and liquid chromatography -mass spectrometry analyses confirmed that both SBP and CPO transformed the SRB dye into low molecular weight intermediates. While most of the intermediates produced by the two enzymes were the same, the CPO treatment produced at least one different intermediate. Furthermore, toxicological evaluation using lettuce (Lactuca sativa) seeds demonstrated that the SBP-based treatment was able to eliminate the phytotoxicity of SRB dye, but the CPO-based treatment did not. Our results show, for the first time, that while both of these related enzymes can be used to efficiently degrade organic pollutants, they have different optimum reaction conditions and may not be equally efficient in detoxification of organic pollutants.
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Affiliation(s)
- Aysha Hamad Alneyadi
- Department of Biology, United Arab Emirates University, P.O. BOX 15551, Al-Ain, UAE.
| | - Iltaf Shah
- Department of Chemistry, United Arab Emirates University, P.O. BOX 15551, Al-Ain, UAE.
| | - Synan F AbuQamar
- Department of Biology, United Arab Emirates University, P.O. BOX 15551, Al-Ain, UAE.
| | - Syed Salman Ashraf
- Department of Chemistry, United Arab Emirates University, P.O. BOX 15551, Al-Ain, UAE.
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Kizil S, Bulbul Sonmez H. Preparation of biphenyl-bridged, crosslinked polyalkoxysilanes: Determination of oil/organic solvent absorption features. J Appl Polym Sci 2016. [DOI: 10.1002/app.44193] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Soner Kizil
- Department of Chemistry; Gebze Technical University; 41400 Gebze Kocaeli Turkey
| | - Hayal Bulbul Sonmez
- Department of Chemistry; Gebze Technical University; 41400 Gebze Kocaeli Turkey
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Enhanced Anti-Ultraviolet and Thermal Stability of a Pesticide via Modification of a Volatile Organic Compound (VOC)-Free Vinyl-Silsesquioxane in Desert Areas. Polymers (Basel) 2016; 8:polym8080282. [PMID: 30974559 PMCID: PMC6432495 DOI: 10.3390/polym8080282] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 07/25/2016] [Accepted: 07/28/2016] [Indexed: 11/17/2022] Open
Abstract
Due to the effect of severe environmental conditions, such as intense heat, blowing sand, and ultraviolet light, conventional pesticide applications have repeatedly failed to adequately control mosquito and sandfly populations in desert areas. In this study, a vinyl silsesquioxane (VS) was added to a pesticide (citral) to enhance residual, thermal and anti-ultraviolet properties via three double-bond reactions in the presence of an initiator: (1) the connection of VS and citral, (2) a radical self-polymerization of VS and (3) a radical self-polymerization of citral. VS-citral, the expected and main product of the copolymerization of VS and citral, was characterized using standard spectrum techniques. The molecular consequences of the free radical polymerization were analyzed by MALDITOF spectrometry. Anti-ultraviolet and thermal stability properties of the VS-citral system were tested using scanning spectrophotometry (SSP) and thermogravimetric analysis (TGA). The repellency of VS-citral decreased over time, from 97.63% at 0 h to 72.98% at 1 h and 60.0% at 2 h, as did the repellency of citral, from 89.56% at 0 h to 62.73% at 1 h and 50.95% at 2 h.
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Investigation of organic solvent/oil sorption capabilities of phenylene-bridged cross-linked poly(alkoxysilane)s. JOURNAL OF POLYMER RESEARCH 2016. [DOI: 10.1007/s10965-016-0938-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Lin DR, Hu LJ, Xing BS, You H, Loy DA. Mechanisms of Competitive Adsorption Organic Pollutants on Hexylene-Bridged Polysilsesquioxane. MATERIALS 2015; 8:5806-5817. [PMID: 28793535 PMCID: PMC5512655 DOI: 10.3390/ma8095275] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 08/20/2015] [Accepted: 08/21/2015] [Indexed: 11/29/2022]
Abstract
Hexylene-bridged periodic mesoporous polysilsesquioxanes (HBPMS) are a promising new class of adsorbent for the removal of organic contaminants from aqueous solutions. These hybrid organic-inorganic materials have a larger BET surface area of 897 m2·g−1 accessible through a cubic, isotropic network of 3.82-nm diameter pores. The hexylene bridging group provides enhanced adsorption of organic molecules while the bridged polysilsesquioxane structure permits sufficient silanols that are hydrophilic to be retained. In this study, adsorption of phenanthrene (PHEN), 2,4-Dichlorophenol (DCP), and nitrobenzene (NBZ) with HBPMS materials was studied to ascertain the relative contributions to adsorption performance from (1) direct competition for sites and (2) pore blockage. A conceptual model was proposed to further explain the phenomena. This study suggests a promising application of cubic mesoporous BPS in wastewater treatment.
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Affiliation(s)
- De-Rong Lin
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Li-Jiang Hu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Bao-Shan Xing
- Department of Plant, Soil & Insect Sciences, University of Massachusetts Amherst, MA 01003, USA.
| | - Hong You
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Douglas A Loy
- Departments of Materials Science & Engineering and Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA.
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