Journal of Water Process Engineering
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2024
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IF 6.3
Tianmin Gong,Chunmei Gao,Shifeng Ji,Yunqing Xing
2-Methyl-4-chlorophenoxyacetic acid (MCPA) is a herbicide that poses a threat to the environment. In this study, MIL-88A was utilized as a photocatalyst to degrade MCPA. Results demonstrated that the Light/MIL-88A/H 2 O 2 system exhibited remarkable photo-Fenton catalytic activity . Under optimal conditions of pH = 3.8, H 2 O 2 concentration of 1.2 mL/L, MIL-88A dosage of 0.2 g/L and an initial MCPA solution concentration of 50 mg/L, the degradation efficiency reached its peak, achieving a 99.9 % degradation rate of MCPA within 60 min. The morphology, structure, and photocatalytic performance of MIL-88A were investigated using characterization techniques such as SEM, XRD , XPS , and UV–vis DRS . Free radical quenching experiments and ESR characterization demonstrated that the main active material in the degradation of MCPA was •OH. The possible degradation pathways of MCPA were hypothesized by combining the results of Gaussian software and LC-MS analysis. Furthermore, the toxicity of MCPA was evaluated using T.E.S.T. software and mung bean germination experiments. The results revealed that the degradation of MCPA by Light/MIL-88A/H 2 O 2 system could achieve solution detoxification .
研究领域:
环境科学
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化学工程
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Shifeng Ji,Xuntao Li,Yunqing Xing,Tianmin Gong,Chunmei Gao
This study focused on 2-methyl-4-chlorophenoxyacetic acid (MCPA) in agricultural wastewater as the target pollutant, synthesizing MIL-88A with three distinct morphologies (rod-like, spindle-like, and diamond-like) and systematically investigating their photocatalytic degradation performance. Characterization results demonstrated that rod-shaped MIL-88A (MIL-88A-r) exhibited the highest photocatalytic activity, achieving complete degradation of 50 mg/L MCPA within 60 min under a visible light/H 2 O 2 system, attributed to its high specific surface area (11.44 m²/g) and low photogenerated charge carrier recombination rate. Adsorption experiments revealed that the adsorption of MCPA onto the catalyst surface followed pseudo-second-order kinetics and conformed to the Langmuir isotherm model. Through response surface methodology optimization of practical wastewater treatment conditions (pH 5.7, H 2 O 2 16.3 mL/L, catalyst 1.6 g/L, irradiation time 2.5 h), COD and TOC removal rates reached 69.0% and 57.8%, respectively. Furthermore, the biodegradability of the treated wastewater was significantly enhanced. This study provides new insights into the application of MOFs materials in pesticide wastewater treatment.
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高影响因子
CROP PROTECTION
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2020
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IF 2.381
Guanglong Ding,Jingyue Tang,Wenbing Zhang,Yanran Li,Junfan Niu,Weichen Wang,Hong Huo,Jianqiang Li,Yongsong Cao
Auxinic herbicides are widely used to control broadleaf weeds in cereal crop fields due to their excellent herbicidal activities. However, volatile drifting caused by their high vapor pressures is a great threat to neighbouring susceptible crops and environment and severely limits auxinic herbicide applications. In this study, a series of auxinic herbicide dimers were synthesized using 2,4-D, dicamba and MCPA as monomers to reduce their vapor pressures. The results showed that all of the dimers significantly reduced volatilities due to larger molecular weight. The dimers linked with two ester bonds had 2-fold higher herbicidal efficacies than their corresponding monomers in filed experiments. The dimers linked with amide bonds appeared to function as contact action and systemic action herbicides. The dimers, 3a-2(ethane-1,2-diylbis (2-(2,4-dichlorophenoxy)acetate)), 3a-4(2-((2-(2,4-dichlorophenoxy)acetyl)thio)ethyl 2-(2,4-dichlorophenoxy)acetate), 3b-2(ethane-1,2-diylbis(2-(4-chloro-2-methylphenoxy)acetate)) and 3c-2(ethane-1,2-diylbis(3,6-dichloro-2-methoxybenzoate)) significantly increased the efficacies and reduced volatilities, thus could be developed as potential novel postemergence herbicides.
研究领域:
植物学
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农业科学
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高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 12
·4560-4566
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IF 10.182
Yunhao Gao,Zhiyuan Zhou,Xi Chen,Yuyang Tian,Yan Li,Huachen Wang,Xuan Li,Xueyang Yu,Yongsong Cao
Volatilization and leaching are two critical pathways for pesticide transportation from their applied areas to non-target regions. Nanocarrier-based formulations can improve the use efficiency and reduce the off-target effects of pesticides, however, the complicated preparation process seriously restricts the large-scale application of nanopesticides in the agricultural field. In this work, taking 2-(2,4-dichlorophenoxy) acetic acid (2,4-D), 2-methyl-4-chlorophenoxyacetic acid (MCPA), and 3,5-dibromo-4-hydroxybenzonitrile (bromoxynil) as model herbicides, herbicide-intercalated Zn–Al hydrotalcites (herbicide@HTlcs) were facilely fabricated by a modified co-precipitation method without heating, aging, organic solvents, and inert gas. The obtained herbicide@HTlcs showed high entrapment efficiencies (71.7%–86.7%), a sheet structure with an average size of 339.4 nm, and positive surface charges (+40.5). The volatilities of herbicide@HTlcs were reduced more than 3-fold compared with those of pure herbicides. The release rates of 2,4-D@HTlcs were in line with the selectivity sequence of HTlcs for the anions and controlled by non-Fickian diffusion. The leaching experiments performed in two agricultural topsoils collected from Beijing and Yunnan province and a grassland soil from Neimenggu province all demonstrated that the developed 2,4-D@HTlc nanosheets could evidently retard 2,4-D leaching through the soil. Additionally, 2,4-D@HTlcs exhibited no delay in the control efficacy against Amaranthus retroflexus compared with free 2,4-D sodium salt. This study provides a novel insight into the facile fabrication of controlled release formulations of pesticides that can reduce the volatilization and leaching risks simultaneously.
研究领域:
农业科学
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环境科学
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材料科学
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高影响因子
CURRENT MICROBIOLOGY
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2016
·Vol. 74
·期 2
·193-202
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IF 1.519
Xia Zhen-Yuan,Zhang Long,Zhao Yan,Yan Xin,Li Shun-Peng,Gu Tao,Jiang Jian-Dong
In this study, a bacterial strain of Achromobacter sp. LZ35, which was capable of utilizing 2,4-dichlorophenoxyacetic acid (2,4-D) and 2-methyl-4-chlorophenoxy acetic acid (MCPA) as the sole sources of carbon and energy for growth, was isolated from the soil in a disused pesticide factory in Suzhou, China. The optimal 2,4-D degradation by strain LZ35 occurred at 30 °C and pH 8.0 when the initial 2,4-D concentration was 200 mg L −1 . Strain LZ35 harbored the conserved 2,4-D/alpha-ketoglutarate dioxygenase (96%) and 2,4-dichlorophenol hydroxylase (99%), and catabolized 2,4-D via the intermediate 2,4-dichlorophenol. The inoculation of 7.8 × 10 6 CFU g −1 soil of strain LZ35 cells to 2,4-D-contaminated soil could efficiently remove over 75 and 90% of 100 and 50 mg L −1 2,4-D in 12 days and significantly released the phytotoxicity of maize caused by the 2,4-D residue. This is the first report of an Achromobacter sp. strain that was capable of mineralizing both 2,4-D and MCPA. This study provides us a promising candidate for its application in the bioremediation of 2,4-D- or MCPA-contaminated sites.
研究领域:
环境微生物学
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生物修复
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环境科学
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Yizhen Cheng,Xiaoyu Zhu,Pengwei Yan,Binyuan Wang,Jing Kang,Jimin Shen,Qiang Tan,Xinwei Zhu,Tianhao She,Jinxiang Zuo,Shengxin Zhao,Zhonglin Chen
Novel zero-valent iron (ZVI) and zero-valent zinc (ZVZ) bimetal-supported biochar (ZF@BC) was developed for heterogeneous catalytic ozonation (HCO), which demonstrated the unique dual synergistic adsorption and catalysis-induced effective O 3 triggering and interfacial decontamination. ZF@BC exhibited impressive catalytic and structure stabilities for 2-methyl-4-chlorophenoxyacetic acid (MCPA) degradation during long-lasting HCO, which can resist interference from a complex water quality background. Abundant electron-rich oxygen-containing functional groups and defects on BC contributed to the adsorption of MCPA and O 3 , respectively, while the introduced ZVZ was anticipated to expedite O 3 decomposition by facilitating single-electron transfer reduction of O 2 and establishing a robust connection with ZVI. Continuous efficacy of bimetal in three stages enhanced the efficiency of O 3 utilization and hydroxyl radicals ( • OH) yield, thereby safely mitigating the associated toxicity of MCPA after treatment. The development of O 3 /ZF@BC introduced a sustainable, long-term decontamination strategy and provided valuable insights for the advancement of HCO.
研究领域:
环境科学
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水处理
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催化
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材料科学
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DOI
高影响因子
CHEMOSPHERE
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2023
·
IF 8.8
Xuan Zhang,Keke Geng,Ningning Wu,Gang Hu,Ben Fan,Jian He,Wenjing Qiao
4-Chloro-2-methylphenoxyacetic acid (MCPA) is a widely used herbicide across the world. MCPA is persistent and easily transports into anoxic environment, such as groundwater, sediments and deep soils. However, little research on anaerobic microbial degradation of MCPA was carried out. The functional microorganisms as well as the catabolic pathway are still unknown. In this research, an anaerobic MCPA-degrading bacterial consortium was enriched from the river sediment near a pesticide-manufacturing plant. After about 6 months’ acclimation , the MCPA transformation rate of the consortium reached 4.32 μmol g −1 day −1 , 25 times faster than that of the original sludge . 96% of added MCPA (2.5 mM) was degraded within 9 d of incubation. Three metabolites including 4-chloro-2-methylphenol (MCP), 2-methylphenol (2-MP) and phenol were identified during the anaerobic degradation of MCPA. An anaerobic catabolic pathway was firstly proposed: firstly, MCPA was transformed to MCP via the cleavage of the aryl ether, then MCP was reductively dechlorinated to 2-MP which was further demethylated to phenol. The 16S rRNA gene amplicon sequencing revealed a substantial shift in the bacterial community composition after the acclimation. SBR1031, Acidaminococcaceae , Aminicenantales , Syntrophorhabdus , Acidaminobacter , Bacteroidetes_vadinHA17 , Methanosaeta , Bathyarchaeia , KD4-96, Anaeromyxobacter , and Dehalobacter were significantly increased in the enriched consortium after acclimation, and positively correlated with the anaerobic degradation of MCPA as suggested by heat map correlation analysis. This study provides a basis for further elucidation of the anaerobic catabolism of MCPA, and contributes to developing efficient and low-cost anaerobic treatment technologies for MCPA pollution.
研究领域:
环境微生物学
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生物降解与生物转化
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水污染控制
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）