1
|
He Z, Wang Z, Gao B, Liu S, Zhao X, Shi H, Wang M. Stereostructure-activity mechanism of cyproconazole by cytochrome P450 in rat liver microsomes: A combined experimental and computational study. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125764. [PMID: 33827004 DOI: 10.1016/j.jhazmat.2021.125764] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 03/22/2021] [Accepted: 03/23/2021] [Indexed: 06/12/2023]
Abstract
Cyproconazole (CPZ), representing the chiral triazole fungicides, is widely used in the pharmaceutical and agricultural fields. To clarify its potential adverse effects on the generalized CYP-mediated processes within mammalian, a comparative experimental and computational approach was employed to investigate the CYP-mediated metabolism processes of CPZ stereoisomers in rat liver microsomes (RLMs). The depletion rate of CPZ stereoisomers in vitro incubation system with RLMs followed the order RR-> SS-> SR-> RS-CPZ. The results of kinetic assays were in line with the depletion rate results. Further inhibition assay confirmed the stereoselective metabolism of CPZ stereoisomers by different CYP isoforms. Molecular dynamics (MD) simulation revealed the stereoselective metabolism mechanism. Several hydrogen bonds and π-stacking restrict the position of CPZ isomers in the active cavity of CYPs so that the 4'-nitrogen on the triazole ring can bind closely to the heme of CYP, which results in the metabolism of CPZ isomers. By combining the computational and experimental approaches, the structure-activity relationship of CPZ and CYP was elucidated, and this method can be further applied to predict the degree of uncertainty in the process of xenobiotic biotransformation of triazole fungicides and serve as a basis for risk assessment.
Collapse
Affiliation(s)
- Zongzhe He
- Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, China
| | - Zhen Wang
- Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, China
| | - Beibei Gao
- Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, China; Toxicological Center, University of Antwerp, Wilrijk, Belgium
| | - Shiling Liu
- Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, China
| | - Xuejun Zhao
- Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, China
| | - Haiyan Shi
- Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, China
| | - Minghua Wang
- Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, China.
| |
Collapse
|
2
|
Shi Y, Ye Z, Hu P, Wei D, Gao Q, Zhao Z, Xiao J, Liao M, Cao H. Removal of prothioconazole using screened microorganisms and identification of biodegradation products via UPLC-QqTOF-MS. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 206:111203. [PMID: 32866888 DOI: 10.1016/j.ecoenv.2020.111203] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 08/11/2020] [Accepted: 08/19/2020] [Indexed: 06/11/2023]
Abstract
Degradation of the prothioconazole by three strains of microorganisms isolated from activated sludge obtained from a pesticide factory was assessed, and an ultrahigh-performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC-QqTOF-MS) method for the determination of prothioconazole and its metabolites was established. The optimal conditions for the degradation of prothioconazole were determined by single factor optimization experiments. A degradation rate of 93.32% is achieved when the prothioconazole is co-cultured with the strain W313 at a cultivation time of 60 h, a cultivation temperature of 30 °C, a pH of 6.33, a prothioconazole concentration of 50 mg L-1, a microorganism volume of 10%, and a dextrose volume of 4%. The three effective microorganism strains were identified by morphological and molecular biology to be Candida tropicalis, Enterobacter cloacae, and Pseudomonas aeruginosa. UPLC-QqTOF-MS analysis allowed the identification of 62 different prothioconazole degradation products produced by the strain cultures, with prothioconazole-desthio, prothioconazole-dechloropropyl, and oxidizing prothioconazole being the main products. In addition, degradation products from different strains and conditions were compared. The results of scatter plot (S-Plot) analysis indicated that C9H7NO, C10H17N7, and C12H13ClN2O were only detected in the products incubated with Enterobacter cloacae. Thus, this study demonstrates that Enterobacter cloacae and Pseudomonas aeruginosa possesses high potential for bioremediation of prothioconazole-contaminated environments.
Collapse
Affiliation(s)
- Yanhong Shi
- School of Resource and Environment, Anhui Agricultural University, Hefei, 230036, PR China; Provincial Key Laboratory for Agri-Food Safety, Hefei, 230036, Hefei, 230036, PR China
| | - Zhuang Ye
- School of Resource and Environment, Anhui Agricultural University, Hefei, 230036, PR China
| | - Peng Hu
- School of Resource and Environment, Anhui Agricultural University, Hefei, 230036, PR China
| | - Dong Wei
- School of Resource and Environment, Anhui Agricultural University, Hefei, 230036, PR China
| | - Quan Gao
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China; Anhui Province Key Laboratory of Integrated Pest Management on Crops, Anhui Agricultural University, Hefei, 230036, PR China
| | - Zhenyu Zhao
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China
| | - Jinjing Xiao
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China; Anhui Province Key Laboratory of Integrated Pest Management on Crops, Anhui Agricultural University, Hefei, 230036, PR China
| | - Min Liao
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China; Anhui Province Key Laboratory of Integrated Pest Management on Crops, Anhui Agricultural University, Hefei, 230036, PR China
| | - Haiqun Cao
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China; Anhui Province Key Laboratory of Integrated Pest Management on Crops, Anhui Agricultural University, Hefei, 230036, PR China.
| |
Collapse
|
3
|
Necibi M, Saadaoui H, Atayat A, Mzoughi N. Determination of Triazole Pesticides in the Surface Water of the Medjerda River, Tunisia. ANAL LETT 2020. [DOI: 10.1080/00032719.2020.1780250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Mouna Necibi
- High Institute of Environmental Sciences and Technologies of Borj Cedria, Environmental Sciences and Technologies Laboratory, University of Carthage, Hammam Lif, Tunisia
- Laboratoire Milieu Marin, Institut National des Sciences et Technologies de la Mer, Port de Pêche, La Goulette, Tunisia
- Faculty of Science, Department of Chemistry, University of Tunis El Manar, Tunis, Tunisia
| | - Hiba Saadaoui
- Faculty of Science of Bizerte, University of Carthage, Bizerte, Tunisia
| | - Amani Atayat
- Faculty of Science of Bizerte, University of Carthage, Bizerte, Tunisia
| | - Nadia Mzoughi
- High Institute of Environmental Sciences and Technologies of Borj Cedria, Environmental Sciences and Technologies Laboratory, University of Carthage, Hammam Lif, Tunisia
- Laboratoire Milieu Marin, Institut National des Sciences et Technologies de la Mer, Port de Pêche, La Goulette, Tunisia
| |
Collapse
|
4
|
He Z, Wu F, Xia W, Li L, Hu K, Kaziem AE, Wang M. Separation and detection of cyproconazole enantiomers and its stereospecific recognition with chiral stationary phase by high-performance liquid chromatography. Analyst 2019; 144:5193-5200. [DOI: 10.1039/c9an00950g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An optimal chiral analytical method of cyproconazole enantiomers was established based on BBD, and the stereospecific recognition mechanism was elucidated by docking.
Collapse
Affiliation(s)
- Zongzhe He
- Department of Pesticide Science
- College of Plant Protection
- Nanjing Agricultural University
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application
- Nanjing 210095
| | - Fengxu Wu
- College of Chemistry
- Central China Normal University
- Wuhan
- China
| | - Weitong Xia
- Department of Pesticide Science
- College of Plant Protection
- Nanjing Agricultural University
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application
- Nanjing 210095
| | - Lianshan Li
- Department of Pesticide Science
- College of Plant Protection
- Nanjing Agricultural University
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application
- Nanjing 210095
| | - Kunming Hu
- Department of Pesticide Science
- College of Plant Protection
- Nanjing Agricultural University
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application
- Nanjing 210095
| | - Amir E. Kaziem
- Department of Pesticide Science
- College of Plant Protection
- Nanjing Agricultural University
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application
- Nanjing 210095
| | - Minghua Wang
- Department of Pesticide Science
- College of Plant Protection
- Nanjing Agricultural University
- State & Local Joint Engineering Research Center of Green Pesticide Invention and Application
- Nanjing 210095
| |
Collapse
|
5
|
Mercado DF, Bracco LLB, Arques A, Gonzalez MC, Caregnato P. Reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals. CHEMOSPHERE 2018; 190:327-336. [PMID: 28992485 DOI: 10.1016/j.chemosphere.2017.09.134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 08/19/2017] [Accepted: 09/27/2017] [Indexed: 06/07/2023]
Abstract
Flusilazole is an organosilane fungicide used for treatments in agriculture and horticulture for control of diseases. The reaction kinetics and mechanism of flusilazole with sulfate and hydroxyl radicals were studied. The rate constant of the radicals with the fungicide were determined by laser flash photolysis of peroxodisulfate and hydrogen peroxide. The results were 2.0 × 109 s-1M-1 for the reaction of the fungicide with HO and 4.6 × 108 s-1 M-1 for the same reaction with SO4- radicals. The absorption spectra of organic intermediates detected by laser flash photolysis of S2O82- with flusilazole, were identified as α-aminoalkyl and siloxyl radicals and agree very well with those estimated employing the time-dependent density functional theory with explicit account for bulk solvent effects. In the continuous photolysis experiments, performed by photo-Fenton reaction of the fungicide, the main degradation products were: (bis(4-fluorophenyl)-hydroxy-methylsilane) and the non-toxic silicic acid, diethyl bis(trimethylsilyl) ester, in ten and twenty minutes of reaction, respectively.
Collapse
Affiliation(s)
- D Fabio Mercado
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT-La Plata-CONICET, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900, La Plata, Argentina
| | - Larisa L B Bracco
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT-La Plata-CONICET, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900, La Plata, Argentina
| | - Antonio Arques
- Grupo de Procesos de Oxidación Avanzada, Departamento de Ingeniería Textil y Papelera, Universitat Politècnica de València, Campus de Alcoy, Plaza Ferrandiz y Carbonell s/n, 03801, Alcoy, Spain
| | - Mónica C Gonzalez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT-La Plata-CONICET, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900, La Plata, Argentina
| | - Paula Caregnato
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT-La Plata-CONICET, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900, La Plata, Argentina.
| |
Collapse
|
6
|
Molinari R, Lavorato C, Argurio P. Recent progress of photocatalytic membrane reactors in water treatment and in synthesis of organic compounds. A review. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.06.047] [Citation(s) in RCA: 126] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
7
|
Huang AG, Tu X, Liu L, Wang GX, Ling F. The oxidative stress response of myclobutanil and cyproconazole on Tetrahymena thermophila. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2016; 41:211-218. [PMID: 26724607 DOI: 10.1016/j.etap.2015.12.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 12/10/2015] [Accepted: 12/14/2015] [Indexed: 06/05/2023]
Abstract
Using Tetrahymena thermophila as experimental models, the oxidative stress of triazole fungicides myclobutanil (MYC) and cyproconazole (CYP) was investigated. Results showed that 24-h EC50 values for MYC and CYP were 16.67 (13.37-19.65) and 20.44 (18.85-21.96) mg/L, respectively; 48-h EC50 values for MYC and CYP were 14.31 (13.13-15.42) and 18.76 (17.09-20.31) mg/L, respectively. Reactive oxygen species was significantly induced and cytotoxicity was caused by MYC and CYP by increasing propidium iodide (PI) fluorescence. Damage of regular wrinkles and appearing of small holes on the cell surface were observed by SEM. Furthermore, MYC and CYP also caused notable changes in enzyme activities and mRNA levels. Overall, the present study points out that MYC and CYP lead to oxidative stress on T. thermophila. The information presented in this study will provide insights into the mechanism of triazoles-induced oxidative stress on T. thermophila.
Collapse
Affiliation(s)
- Ai-Guo Huang
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling 712100, Shaanxi, China
| | - Xiao Tu
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling 712100, Shaanxi, China
| | - Lei Liu
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling 712100, Shaanxi, China
| | - Gao-Xue Wang
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling 712100, Shaanxi, China.
| | - Fei Ling
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling 712100, Shaanxi, China.
| |
Collapse
|
8
|
Photocatalytic degradation kinetics and mechanisms of fungicide tebuconazole in aqueous TiO2 suspensions. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.09.023] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
9
|
Reddy PVL, Kim KH. A review of photochemical approaches for the treatment of a wide range of pesticides. JOURNAL OF HAZARDOUS MATERIALS 2015; 285:325-335. [PMID: 25528231 DOI: 10.1016/j.jhazmat.2014.11.036] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 11/04/2014] [Accepted: 11/26/2014] [Indexed: 06/04/2023]
Abstract
Pesticides are renowned as some of the most pernicious chemicals known to humankind. Nine out of twelve most hazardous and persistent organic chemicals on planet have been identified as pesticides and their derivatives. Because of their strong recalcitrant nature, it often becomes a difficult task to treat them by conventional approaches. It is well perceived that many factors can interfere with the degradation of pesticides under ambient conditions, e.g., media, light intensity, humic content, and other biological components. However, for the effective treatment of pesticides, photochemical methods are viewed as having clear and perceivable advantages. In this article, we provide a review of the fundamental characteristics of photochemical approaches for pesticide treatment and the factors governing their capacity and potential in such a process.
Collapse
Affiliation(s)
- P Venkata Laxma Reddy
- Environmental Science and Engineering, University of Texas Elpaso, Elpaso, TX 79902, USA; Indian Institute of Chemical Technology, Tarnaka, Hyderabad, Andhra Pradesh 50003, India
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seongdong-gu, Seoul 133-791, South Korea.
| |
Collapse
|
10
|
Sharma T, Toor AP, Rajor A. Photocatalytic degradation of imidacloprid in soil: application of response surface methodology for the optimization of parameters. RSC Adv 2015. [DOI: 10.1039/c5ra02224j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The photocatalytic mineralization of imidacloprid (IMI) in soil to inorganic ions and the formation of various intermediates using TiO2 as the photocatalyst have been investigated under UV light.
Collapse
Affiliation(s)
- Teena Sharma
- School of Energy & Environment
- Thapar University
- Patiala 147004
- India
| | - Amrit Pal Toor
- Dr S. S. Bhatnagar University Institute of Chemical Engg. & Tech
- Panjab University
- Chandigarh
- India
| | - Anita Rajor
- School of Energy & Environment
- Thapar University
- Patiala 147004
- India
| |
Collapse
|
11
|
Grover IS, Singh S, Pal B. Photodegradation of imidacloprid insecticide by Ag-deposited titanate nanotubes: a study of intermediates and their reaction pathways. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:12497-12503. [PMID: 25458204 DOI: 10.1021/jf5041614] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The present work demonstrates the influence of Ag-loading (0.2-1.0 wt %) onto sodium titanate nanotubes (TNT) for complete photomineralization of the neurotoxic imidacloprid (IMI) insecticide under UV light illumination. It has been observed that degradation of IMI follows pseudo-first-order kinetics, where 0.5 wt % Ag-loaded TNT exhibited highest apparent rate constant (2.2 × 10(-2) min(-1)) and corresponding least half-life (t1/2) of 31 min for IMI relative to bare P25-TiO2 (3.4 × 10(-3) min(-1), t1/2 = 230 min). The mineralization of IMI intermediates to CO2 during its photooxidation has been described by time course GC-MS and GC analysis and has been correlated with the kinetic analysis. The investigation for the role and quantitative estimation of the fate of heteroatoms (N, O, and Cl) present in IMI revealed an increase in the amount of nitrate, nitrite, and chloride ions with time during its photooxidation. On the basis of these results a mechanistic pathway for photomineralization of IMI is proposed.
Collapse
|
12
|
Bottrel SEC, Amorim CC, Leão MMD, Costa EP, Lacerda IA. Degradation of ethylenethiourea pesticide metabolite from water by photocatalytic processes. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2014; 49:263-270. [PMID: 24502213 DOI: 10.1080/03601234.2014.868280] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this study, photocatalytic (photo-Fenton and H2O2/UV) and dark Fenton processes were used to remove ethylenethiourea (ETU) from water. The experiments were conducted in a photo-reactor with an 80 W mercury vapor lamp. The mineralization of ETU was determined by total organic carbon analysis, and ETU degradation was qualitatively monitored by the reduction of UV absorbance at 232 nm. A higher mineralization efficiency was obtained by using the photo-peroxidation process (UV/H2O2). Approximately 77% of ETU was mineralized within 120 min of the reaction using [H2O2]0 = 400 mg L(-1). The photo-Fenton process mineralized 70% of the ETU with [H2O2]0 = 800 mg L(-1) and [Fe(2+)] = 400 mg L(-1), and there is evidence that hydrogen peroxide was the limiting reagent in the reaction because it was rapidly consumed. Moreover, increasing the concentration of H2O2 from 800 mg L(-1) to 1200 mg L(-1) did not enhance the degradation of ETU. Kinetics studies revealed that the pseudo-second-order model best fit the experimental conditions. The k values for the UV/H2O2 and photo-Fenton processes were determined to be 6.2 × 10(-4) mg L(-1) min(-1) and 7.7 × 10(-4) mg L(-1) min(-1), respectively. The mineralization of ETU in the absence of hydrogen peroxide has led to the conclusion that ETU transformation products are susceptible to photolysis by UV light. These are promising results for further research. The processes that were investigated can be used to remove pesticide metabolites from drinking water sources and wastewater in developing countries.
Collapse
Affiliation(s)
- Sue Ellen C Bottrel
- a Department of Sanitary and Environmental Engineering , Universidade Federal de Juiz de Fora , Juiz de Fora , Minas Gerais , Brazil
| | | | | | | | | |
Collapse
|
13
|
Tao Z, He W, Wang S, Zhou G. Electrochemical Study of Cyproconazole as a Novel Corrosion Inhibitor for Copper in Acidic Solution. Ind Eng Chem Res 2013. [DOI: 10.1021/ie402693d] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Zhihua Tao
- State Key Lab of Electronic Thin
Films and Integrated Devices, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
| | - Wei He
- State Key Lab of Electronic Thin
Films and Integrated Devices, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
| | - Shouxu Wang
- State Key Lab of Electronic Thin
Films and Integrated Devices, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
| | - Guoyun Zhou
- State Key Lab of Electronic Thin
Films and Integrated Devices, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
| |
Collapse
|
14
|
Effect of hydrodynamics during sol–gel synthesis of TiO2 nanoparticles: From morphology to photocatalytic properties. Chem Eng Res Des 2013. [DOI: 10.1016/j.cherd.2013.04.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
15
|
Ahmed SR, Koh K, Park EY, Lee J. Toxic chemical monitoring of agricultural bioproducts using nanomaterials-based sensors. KOREAN J CHEM ENG 2013. [DOI: 10.1007/s11814-013-0156-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
16
|
QIAN KUN, GUO YANZHEN, HE LIN. CONTROLLED RELEASE OF IMIDACLOPRID FROM POLY (STYRENE–DIACETONE CRYLAMIDE)-BASED NANOFORMULATION. INTERNATIONAL JOURNAL OF NANOSCIENCE 2013. [DOI: 10.1142/s0219581x12400364] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Imidacloprid is a neonicotinoids insecticide, which is important for the cash crops such as tomato, rape and so on. The conventional formulation does not only increase the loss of pesticide but also leads to environmental pollution. Controlled-release formulations of pesticide are highly desirable not only for attaining the most effective utilization of the pesticide, but also for reducing environmental pollution. Pesticide imidacloprid was incorporated in poly (styrene–diacetone crylamide)-based formulation to obtain controlled release properties, and the imidacloprid nanocontrolled release formulation was characterized by infrared (IR) and field emission scanning electron microscope (FESEM). Factors related to loading efficiency, swelling and release behaviors of the formulation were investigated. It showed that the loading efficiency could reach about 40% (w/w). The values for the diffusion exponent "n" were in the range of 0.31–0.58, which indicated that the release of imidacloprid was diffusion-controlled. The time taken for 50% of the active ingredient to be released into water, T50, was also calculated for the comparison of formulations in different conditions. The results showed that the formulation with higher temperature and more diacetone crylamide had lower value of T50, which means a quicker release of the active ingredient. This study highlighted some pieces of evidence that improved pesticide incorporation and slower release were linked to potential interactions between the pesticide and the polymer.
Collapse
Affiliation(s)
- KUN QIAN
- College of Plant Protection, Southwest University, Chongqing 400715, P. R. China
| | - YANZHEN GUO
- College of Plant Protection, Southwest University, Chongqing 400715, P. R. China
| | - LIN HE
- College of Plant Protection, Southwest University, Chongqing 400715, P. R. China
| |
Collapse
|
17
|
Amorim CC, Bottrel SEC, Costa EP, Teixeira APC, Leão MMD. Removal of ethylenthiourea and 1,2,4-triazole pesticide metabolites from water by adsorption in commercial activated carbons. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2013; 48:183-190. [PMID: 23356339 DOI: 10.1080/03601234.2013.730287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This study evaluated the adsorption capacity of ethylenthiourea (ETU) and 1H-1,2,4-triazole (1,2,4-T) for two commercial activated carbons: charcoal-powdered activated carbon (CPAC) and bovine bone-powdered activated carbon (BPAC). The tests were conducted at a bench scale, with ETU and 1,2,4-T diluted in water, for isotherm and adsorption kinetic studies. The removal of the compounds was accompanied by a total organic carbon (TOC) analysis and ultraviolet (UV) reduction analysis. The coals were characterized by their surface area using nitrogen adsorption/desorption, by a scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDS) and by a zero charge point analysis (pHpcz). The results showed that adsorption kinetics followed a pseudo-second-order model for both coals, and the adsorption isotherms for CPAC and BPAC were adjusted to the Langmuir and Freundlich isotherms, respectively. The CPAC removed approximately 77% of the ETU and 76% of the 1,2,4-T. The BPAC was ineffective at removing the contaminants.
Collapse
Affiliation(s)
- Camila C Amorim
- Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
| | | | | | | | | |
Collapse
|
18
|
Degradation of PCP-Na with La–B co-doped TiO2 series synthesized by the sol–gel hydrothermal method under visible and solar light irradiation. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2011.04.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
19
|
Kinnari P, Mäkilä E, Heikkilä T, Salonen J, Hirvonen J, Santos HA. Comparison of mesoporous silicon and non-ordered mesoporous silica materials as drug carriers for itraconazole. Int J Pharm 2011; 414:148-56. [PMID: 21601623 DOI: 10.1016/j.ijpharm.2011.05.021] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Revised: 05/04/2011] [Accepted: 05/05/2011] [Indexed: 11/16/2022]
Abstract
Mesoporous materials have an ability to enhance dissolution properties of poorly soluble drugs. In this study, different mesoporous silicon (thermally oxidized and thermally carbonized) and non-ordered mesoporous silica (Syloid AL-1 and 244) microparticles were compared as drug carriers for a hydrophobic drug, itraconazole (ITZ). Different surface chemistries pore volumes, surface areas, and particle sizes were selected to evaluate the structural effect of the particles on the drug loading degree and on the dissolution behavior of the drug at pH 1.2. The results showed that the loaded ITZ was apparently in amorphous form, and that the loading process did not change the chemical structure/morphology of the particles' surface. Incorporation of ITZ in both microparticles enhanced the solubility and dissolution rate of the drug, compared to the pure crystalline drug. Importantly, the physicochemical properties of the particles and the loading procedure were shown to have an effect on the drug loading efficiency and drug release kinetics. After storage under stressed conditions (3 months at 40 °C and 70% RH), the loaded silica gel particles showed practically similar dissolution profiles as before the storage. This was not the case with the loaded mesoporous silicon particles due to the almost complete chemical degradation of ITZ after storage.
Collapse
Affiliation(s)
- Päivi Kinnari
- Division of Pharmaceutical Technology, Faculty of Pharmacy, University of Helsinki, FI-00014, Finland
| | | | | | | | | | | |
Collapse
|
20
|
Xu X, Ji F, Fan Z, He L. Degradation of glyphosate in soil photocatalyzed by Fe3O4/SiO2/TiO2 under solar light. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2011; 8:1258-70. [PMID: 21695039 PMCID: PMC3118888 DOI: 10.3390/ijerph8041258] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2011] [Revised: 04/01/2011] [Accepted: 04/01/2011] [Indexed: 12/04/2022]
Abstract
In this study, Fe(3)O(4)/SiO(2)/TiO(2) photocatalyst was prepared via a sol-gel method, and Fe(3)O(4) particles were used as the core of the colloid. Diffraction peaks of Fe(3)O(4) crystals are not found by XRD characterization, indicating that Fe(3)O(4) particles are well encapsulated by SiO(2). FTIR characterization shows that diffraction peaks of Ti-O-Si chemical bonds become obvious when the Fe(3)O(4) loading is more than 0.5%. SEM characterization indicates that agglomeration occurs in the Fe(3)O(4)/SiO(2)/TiO(2) photocatalyst, whereas photocatalysts modified by Fe(3)O(4)/SiO(2) present excellent visible light absorption performance and photocatalytic activity, especially when the Fe(3)O(4) loading is 0.5%. Photocatalytic degradation of glyphosate in soil by these photocatalysts under solar irradiation was investigated. Results show that 0.5% Fe(3)O(4)/SiO(2)/TiO(2) has the best photocatalytic activity. The best moisture content of soil is 30%~50%. Degradation efficiency of glyphosate reaches 89% in 2 h when the dosage of photocatalyst is 0.4 g/100 g (soil), and it increased slowly when more photocatalyst was used. Soil thickness is a very important factor for the photocatalytic rate. The thinner the soil is, the better the glyphosate degradation is. Degradation of glyphosate is not obviously affected by sunlight intensity when the intensity is below 6 mW/cm(2) or above 10 mW/cm(2), but it is accelerated significantly when the sunlight intensity increases from 6 mW/cm(2) to 10 mW/cm(2).
Collapse
Affiliation(s)
- Xuan Xu
- Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; E-Mails: (F.J.); (L.H.)
| | - Fangying Ji
- Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; E-Mails: (F.J.); (L.H.)
| | - Zihong Fan
- Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; E-Mail:
| | - Li He
- Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; E-Mails: (F.J.); (L.H.)
| |
Collapse
|
21
|
Chebli D, Fourcade F, Brosillon S, Nacef S, Amrane A. Integration of photocatalysis and biological treatment for azo dye removal--application to AR183. ENVIRONMENTAL TECHNOLOGY 2011; 32:507-514. [PMID: 21877531 DOI: 10.1080/09593330.2010.504236] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The feasibility of coupling photocatalysis with biological treatment to treat effluents containing azo dyes was examined in this work. With this aim, the degradation of Acid Red 183 was investigated. The very low biodegradability of AR183 was confirmed beforehand by measuring the biological oxygen demand (BOD5). Photocatalysis experiments were carried out in a closed-loop step photoreactor. The reactor walls were covered by TiO2 catalyst coated on non-woven paper, and the effluent flowed over the photocatalyst as a thin falling film. The removal of the dye was 82.7% after 4 h, and a quasi-complete decolorization (98.5%) was obtained for 10 h of irradiation (initial concentration 100 mg L(-1)). The decrease in concentration followed pseudo-first-order kinetics, with a constant k of 0.47 h(-1). Mineralization and oxidation yields were 80% and 75%, respectively, after 10 h of pretreatment. Therefore, even if target compound oxidation occurs (COD removal), indicating a modification to the chemical structure, the concomitant high mineralization was not in favour of subsequent microbial growth. The BOD5 measurement confirmed the non-biodegradability of the irradiated solution, which remained toxic since the EC50 decreased from 35 to 3 mg L(-1). The proposed integrated process appeared, therefore, to be not relevant for the treatment of AR183. However, this result should be confirmed for other azo dyes.
Collapse
Affiliation(s)
- Derradji Chebli
- Département de Génie des Procédés, Faculté des Sciences de l'Ingénieur, Université Ferhat Abbas, 19000 Sétif, Algeria
| | | | | | | | | |
Collapse
|
22
|
Photocatalytic Degradation of Water Pollutants Using Nano-TiO2. ENERGY EFFICIENCY AND RENEWABLE ENERGY THROUGH NANOTECHNOLOGY 2011. [DOI: 10.1007/978-0-85729-638-2_19] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
23
|
Photo-induced transformation of hexaconazole and dimethomorph over TiO2 suspension. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2008.08.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
24
|
Barka N, Qourzal S, Assabbane A, Nounah A, Ait-Ichou Y. Factors influencing the photocatalytic degradation of Rhodamine B by TiO2-coated non-woven paper. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2007.10.022] [Citation(s) in RCA: 144] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
25
|
Ghauch A. Rapid removal of flutriafol in water by zero-valent iron powder. CHEMOSPHERE 2008; 71:816-826. [PMID: 18178235 DOI: 10.1016/j.chemosphere.2007.11.057] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2007] [Revised: 11/20/2007] [Accepted: 11/20/2007] [Indexed: 05/25/2023]
Abstract
A study of the effect of zero-valent iron (ZVI) powder is carried out for the first time on the degradation of flutriafol ((RS)-2,4'-difluoro-alpha-(1H-1,2,4-triazol-1-ylmethyl)-benzhydryl alcohol, C(16)H(13)F(2)N(3)O), a bifluorinated soil and water persistent triazole pesticide using a laboratory scale device consisting of a 20 ml pyrex serum vials fixed to a Vortex agitator. Different amounts of ZVI powder (10-50 g l(-1)) at pH 6.6 and room temperature were investigated. Experiments showed an observed degradation rate k(obs) directly proportional to the surface of contact of flutriafol with ZVI. Flutriafol degradation reactions demonstrated first order kinetic with a half-live of about 10.8+/-0.5 min and 3.6+/-0.2 min when experiments were conducted at [ZVI]=10 g l(-1) into oxygenated and anoxic solutions, respectively. Three analytical techniques were employed to monitor flutriafol degradation and to understand solution and by-products behaviors: (1) A UV-Vis spectrophotometer; (2) a high performance liquid chromatography (HPLC) coupled with a photo diode array (PDA) and fluorescence detectors; (3) a similar HPLC coupled with a PDA and a mass spectrometer detectors equipped with an atmospheric pressure photoionization source. Results showed a complete disappearance of flutriafol after 20 min of contact with ZVI, the loss of fluorescence properties of the final by-products, the defluorination of the triazole pesticide via hydroxylation reaction and finally the hydrogenation of the triazole ring.
Collapse
Affiliation(s)
- Antoine Ghauch
- American University of Beirut, Faculty of Arts and Sciences, Department of Chemistry, P.O. Box 11-8281, Riad El Solh, Beirut, Lebanon.
| |
Collapse
|
26
|
Araña J, Garriga I Cabo C, Fernández Rodríguez C, Herrera Melián JA, Ortega Méndez JA, Doña Rodríguez JM, Pérez Peña J. Combining TiO2-photocatalysis and wetland reactors for the efficient treatment of pesticides. CHEMOSPHERE 2008; 71:788-794. [PMID: 18023844 DOI: 10.1016/j.chemosphere.2007.10.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Revised: 10/02/2007] [Accepted: 10/03/2007] [Indexed: 05/25/2023]
Abstract
In the present work the photocatalytic and biological degradation of two commercial mixtures of pesticides (Folimat and Ronstar) and two fungicides (pyrimethanil and triadimenol) has been studied. The evolution of some components of these commercial products (dicofol, tetradifon and oxadiazon) and that of the two fungicides has been monitored by means of HPLC, GC-MS, TOC and toxicity (Lemna minor toxicity test) measurements. The photocatalytic method was able to degrade dicofol, tetradifon, pyrimethanil, triadimenol and the components of Ronstar with the exception of oxadiazon. In addition to this, the photocatalytic method eliminated pyrimethanil toxicity and reduced that of triadimenol by a 90%, Ronstar by a 78% and Folimat by an 87%. Nevertheless, the wetland reactors alone could reduce the toxicity of only the former. Finally, the proper dosage of the water containing the pesticides to a photocatalytic reactor followed by a wetland reactor resulted to be the most successful strategy for the detoxification of the studied compounds and their mixtures.
Collapse
Affiliation(s)
- J Araña
- Grupo de Fotocatálisis y Electroquímica Aplicada al Medio-Ambiente (FEAM) de la Universidad de Las Palmas de Gran Canaria, Unidad Asociada al Instituto de Ciencia de Materiales de Sevilla, C.S.I.C, Spain.
| | | | | | | | | | | | | |
Collapse
|
27
|
Lhomme L, Brosillon S, Wolbert D. Photocatalytic degradation of pesticides in pure water and a commercial agricultural solution on TiO2 coated media. CHEMOSPHERE 2008; 70:381-6. [PMID: 17709129 DOI: 10.1016/j.chemosphere.2007.07.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2007] [Revised: 07/02/2007] [Accepted: 07/02/2007] [Indexed: 05/12/2023]
Abstract
Heterogeneous photocatalysis of pesticides is an effective process for removing pesticides from pure water. With a view to treating real agricultural effluents, this paper deals with the degradation of the chlortoluron and cyproconazole pesticides in pure water and the treatment of commercial solutions by photocatalysis on TiO2 coated media. The process was effective in degrading and mineralizing the pesticides. The changes of the fate of heteroatoms showed that during irradiation of the chlortoluron and cyproconazole, NH4+ and NO3(-) ions were produced. A release of chloride ions was observed from the beginning of the irradiation and stoichiometry was achieved. The photodegradation of chlortoluton and cyproconazole in commercial solutions was studied. For the degradation of chlortoluton in a commercial solution, the mineralization was completely achieved whereas in the case of the commercial cyproconazole solution, the degradation kinetic was lower. These results highlight the fact that the chemical nature of the additives in the commercial pesticide solutions does significantly affect the degradation yield of the target compound by photocatalysis.
Collapse
Affiliation(s)
- L Lhomme
- Laboratoire Sciences Chimiques de Rennes UMR CNRS 6226/ENSCR/UR1, Equipe CIP, Ecole Nationale Supérieure de Chimie de Rennes, avenue du Général Leclerc, 35700 Rennes, France
| | | | | |
Collapse
|