JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
·
2019
·
IF 1.463
Mingbo Ma,Suozhuai Dong,Wanhui Jin,Chongqi Zhang,Wenlong Zhou
Pesticides carried by cotton fiber are potential risk for production workers and consumers. Dissipation behaviour of a commonly used cotton pesticide profenofos in cotton fiber during growing period and scouring treatment was investigated. The results showed that profenofos in the fiber from the pre-opened and post-opened bolls both decreased to undetectable amounts 21 days after pesticide application. However, a minority of profenofos was converted to a strongly irritant compound, 4-bromo-2-chlorophenol and retained a non-negligible amount in cotton fiber even after 28 days. Profenofos and its degradation product could be completely removed during the conventional cotton scouring process. The degradation half-time of profenofos in scouring bath was only 3.0 min, and the degradation product was also 4-bromo-2-chlorophenol. Cotton products made of profenofos-carrying fiber are safe; however, the scouring waste should be detoxicated before discharge due to the accumulation of 4-bromo-2-chlorophenol in the scouring bath. These results could be useful for evaluating the risk of cotton fiber from the profenofos applied fields.
研究领域:
农业科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Ma Anzhou,Ma Jianpeng,Chen Xianke,Zhuang Guoqiang
Highly chlorinated benzenes usually have a low efficient degradation in environment. Here we proposed a synergistic removal strategy of pentachlorobenzene (PeCB) using Pseudomonas sp. JS100 coupled with immobilized nanoscale zero-valent iron (NZVI). The structural and textural features of the synergistic system were characterized by X-ray powder diffraction, field emission scanning electron microscopy, and a specific surface area and pore size analysis. Nanoscale zero-valent iron particles were dispersed and attached to the biofilter, which increased the specific surface area to 34.5 m2 g−1. The batch experiment revealed that the removal efficiency of PeCB reached 80.2% in the synergistic system within 48 h. The degradation followed pseudo-first-order reaction kinetics, and the reaction rate constant was measured to be 0.0336 h−1. In the degradation mechanism, PeCB was degraded by NZVI to lower chlorobenzenes, which were utilized by Pseudomonas sp. JS100 as nutrients, thereby achieving rapid removal of PeCB.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2010
·Vol. 86
·期 1
·38-42
·
IF 0.992
Yang Zhong-Zhi,Li Yong-Fang,Li Zhi-Chun,Gu Yu-Mei,Zhu Ya,Zhang Zhan-Jun
Five higher Chlorinated Benzenes (CBs), include Hexachlorobenzene (HCB), pentachlorobenzene (PeCB) and three isomers of tetrachlorobenzens, were analyzed in 20 outdoor dust samples collected from a fast developing city, Xinxiang. Only HCB was detected in all outdoor dust samples. The dominate part of the CBs residue in most samples was HCB and the mean HCB concentration (4.13 ng/g dry weight) in this study was in the range of global background soil HCB levels (ranging from 0.010 to 5.20 ng/g dry weight). The higher ratios of HCB/PeCB in the outdoor dust samples in the present study indicate that pesticide application may be an important source of HCB in China.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
CARBON
·
2018
·
IF 7.082
Kaikai Zhang,Peng Sun,Marie Christine A.S. Faye,Yanrong Zhang
The property of biochar and its potential application toward chlorobenzene degradation were investigated in this study. The biochar was derived from rice husk and charred at 550 °C in N 2 atmosphere, which showed a significant degradation of chlorobenzene in ambient atmosphere. The results from Scanning Electron Microscope , X-Ray Diffraction and Raman Spectroscopy indicated the formation of poorly ordered graphene stacks embedded in amorphous phases on biochar. Fourier Transform Infrared Spectroscopy and Electron Paramagnetic Resonance suggested the existence of hydroquinone-quinone moieties on biochar, which could induce the generation of reactive oxygen species and promote the degradation of chlorobenzene. Furthermore, hydrogen peroxide and hydroxyl radicals were generated from the reduction of oxygen with the oxidization of phenolic hydroxyl groups on biochar, which was responsible for chlorobenzene degradation. In addition, more types of intermediate products of chlorobenzene degradation were detected in biochar system compared with conventional Fenton reaction, which could be possibly ascribed to the interfacial reaction between chlorobenzene and reactive oxygen species on biochar surface. The findings in this study would provide a new insight into the application of biochar in organic pollutant removal .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Progress in Natural Science-Materials International
·
2024
·
IF 4.8
Mengxia Ma,Zhaoyang Li,Xu Yan,Yanli Mao,Chaohai Wang,Haiyan Kang,Qun Yan,Jieqiang Zhou,Zhongxian Song,Dandan Pang
Magnetic flower-like α-Fe 2 O 3 @N–C particles were synthesized by hydrothermal self-assembly method and oxygen-limited carbonisation in a glycerol and ethanol solution system using glucose as the carbon source, iron nitrate as the magnetic source and particle skeleton and urea as the nitrogen source. Four hydrothermal temperatures of 120 °C, 140 °C, 160 °C and 180 °C were used to modulate the adsorbent structure. Hydrothermal temperature of 140 °C, solution pH = 7, and a dosage of 0.06 g are the optimum conditions. The adsorption capacity of 2,4-dichlorophenol (2,4-DCP) onto MC-2 was determined as 108.556 mg g −1 at 25 °C. Experiments show that the adsorbents all fitted well to the Langmuir isothermal adsorption model and the quasi-secondary kinetic model, and the adsorption behaviour was dominated by monolayer chemisorption . The adsorption process was heat absorbing and spontaneous. Raman and XRD analysis showed that the adsorbent had a stable α-Fe 2 O 3 skeleton and carbon layers. FTIR and XPS analysis showed that the adsorbent had hydrogen bonding , electrostatic interaction and π-π bonding to 2,4-dichlorophenol.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Communications Biology
·
2024
·Vol. 7
·期 1
·1-14
·
IF 5.2
Tan Chao,Li Suxin,Song Jia,Zheng Xianfu,Zheng Hao,Xu Weichang,Wan Cui,Zhang Tan,Bian Qiang,Men Shuzhen
Auxins and their analogs are widely used to promote root growth, flower and fruit development, and yield in crops. The action characteristics and application scope of various auxins are different. To overcome the limitations of existing auxins, expand the scope of applications, and reduce side effects, it is necessary to screen new auxin analogs. Here, we identified 3,4-dichlorophenylacetic acid (Dcaa) as having auxin-like activity and acting through the auxin signaling pathway in plants. At the physiological level, Dcaa promotes the elongation of oat coleoptile segments, the generation of adventitious roots, and the growth of crop roots. At the molecular level, Dcaa induces the expression of auxin-responsive genes and acts through auxin receptors. Molecular docking results showed that Dcaa can bind to auxin receptors, among which TIR1 has the highest binding activity. Application of Dcaa at the root tip of the DR5:GUS auxin-responsive reporter induces GUS expression in the root hair zone, which requires the PIN2 auxin efflux carrier. Dcaa also inhibits the endocytosis of PIN proteins like other auxins. These results provide a basis for the application of Dcaa in agricultural practices.
研究领域:
植物学
·
分子生物学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Groundwater
·
2018
·Vol. 56
·期 4
·673-679
·
IF 1.9
Wenjing Qiao,Shujun Ye,Jichun Wu,Ming Zhang
Remediation of the sites contaminated with organic contaminants, such as chlorobenzenes, remains a challenging issue. Electroosmotic flushing can be a promising approach which is based on mechanism of electrokinetic remediation for removal of organic contaminants from fluids in low-permeability soil. To select an optimum surfactant that can effectively enhance electroosmotic flushing, three common surfactants, Triton X-100 (EK2), Tween 80 (EK3), and a mixture of sodium dodecyl sulfate and Triton X-100 (EK4) buffered with Na 2 HPO 4 /NaH 2 PO 4 solution, were tested. The efficiency of each kind of surfactant was evaluated using a three-dimensional box filled with a clayey soil spiked with 1,2,4-trichlorobenzene, and compared with a test (EK1) without surfactant. The results demonstrated that the buffer solutions efficiently neutralized H + and OH − produced by electrolysis. EK3 with Tween 80 added in the flushing solution reached the highest electroosmotic permeability of 10 −4 cm 2 /v/s and achieved a notably high cumulative electroosmotic flow (EOF) of 5067 mL within 6 d, which was 6.3, 3.4, and 4.2 times higher than that in EK1, EK2, and EK4, respectively. There were 420 mL more cumulative EOF obtained after 50 h of electrical application in EK4 than in EK2. The introduction of nonreactive ions can increase the current, thereby benefiting the EOF. Both the higher pH caused by the buffer and the application of nonionic surfactants can make the zeta potential more negative, thereby increasing the EOF. Tween 80 can be recommended as the best flushing solution for removing organic contaminants from sites when electrokinetic remediation is applied.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 10
·9480-9489
·
IF 2.914
Dai Shijin,Zheng Yilin,Zhao Youcai,Li Qiang,Niu Dongjie
Chlorine-containing organic waste (COWs) is a big threat for the waste incineration because of the dioxin generation and equipment corrosion. Recently, dechlorination and detoxification of COWs is emergent in order to lower the environmental risk and treatment costs. In this study, base-catalyzed decomposition processes with different hydroxides, hydrogen donors, and catalysts were conducted for pre-treatment of COWs to reduce organic chlorine content, with the TCB as a model compound and industrial rectification residues for verification. Results showed that maximum chlorine retention efficiency (CRE) of four alkalis followed the order of KOH > NaOH–KOH > NaOH > Mg(OH) 2 , which were 98.3%, 93.4%, 97.2%, and 1.5%, respectively, and could be expressed as an apparent first-order reaction. The differences were resulted from the varying ionic potentials of the metal cations. Hydrogen donors (glycol, glycerol, paraffin oil, and PEG 200) acted as effective dechlorination regents follow the order of PEG > glycol > paraffin oil > glycerol. In addition, Fe, Ni, Cu, and activated carbon catalysts increased the CRE by 68.9% to 92.4%, 91.9%, 89.2%, and 73.3%, respectively. Residue analysis through X-ray diffraction and Fourier transform infrared spectroscopy revealed that KCl, sodium oxalate, and phenol were the main products and a plausible stepwise dechlorination pathway was proposed. The effectiveness of three optimized combinations including NaOH/PEG, KOH/PEG, and NaOH–KOH/PEG (with the Fe catalyst) was confirmed by using them for dechlorinating rectification residues, and they restrained 98.2%, 91.2%, and 94.6% of the chlorine, respectively. The organochlorine content decreased from 19.2 to 1.8% within 180 min, while inorganic chorine content increased from 1.5 to 18.9%, indicating the potential for COWs dechlorination.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2014
·Vol. 31
·期 12
·2192-2197
·
IF 1.241
Anjum Muhammad Naveed,Zia Khalid Mahmood,Zhu Lihua,Haroon-ur-Rashid,Ahmad Mirza Nadeem,Zuber Mohammad,Tang Heqing
Self-assembled hollow microspheres poly( o -chloroaniline) (POC) have been synthesized by simple oxidative polymerization of o -chloroaniline using camphor-sulfonic acid (CSA) as dopant acid and ammonium persulfate (APS) as oxidant. The POC microspheres were characterized by means of FTIR, XRD and SEM analysis. Adsorption characteristics of POC spheres were studied by using methyl orange (MO) as adsorbate. It was found that adsorption of MO by POC was better described by pseudo-second-order kinetics than any other kinetic model, such as the pseudo-first-order and intra-particle diffusion models. Langmuir adsorption isotherm model was the best to fit experimental data. The results showed that hollow microspheres of POC can be used as novel and low-cost adsorbent for removal of organic dye from waste water.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Yanmei Yuan,Hong Tao,Jinhong Fan,Luming Ma
Compared with heavy metal catalysts, persulfate (PS) activated with iron-based materials for controlling refractory organic pollutants are more effective, environment-friendly, and safe to human health. However, Fe 2+ application is limited to acidic conditions, and Fe 0 is not thermodynamically stable in water. Ferrous sulfide (FeS) ore particles are large-sized, low-purity, crystallized iron-based materials that are inexpensive and readily available. In this work, FeS is proposed as an alternative electron donor to activate persulfate and degrade p -chloroaniline (PCA). The effects of initial solution pH, FeS dose, and persulfate concentration on PCA degradation and total organic carbon (TOC) removal were examined at 20 ± 5 °C in batch experiments. Cl − , SO 4 2 − , and Fe 3+ ions were the main inorganic products used to investigate the oxidative mechanism in the present system. Compared with Fe 2+ , FeS could serve as a continuous-releasing source of dissolved Fe 2+ and surface bound Fe 2+ , with PCA removal increasing by 80% at pH 7.0 for a 1 h reaction. In contrast with Fe 0 , recycling of Fe 3+ to Fe 2+ can prevent excessive Fe 2+ consumption and Fe 3+ accumulation. The PS activation mechanism was affected by the initial solution pH. And the application ranges of pH for PCA fast degradation was from 3.0 to 7.0 in the tested pH values of 3.0–11.0 and nearly complete degradation of PCA (>99%) was observed at 150 min, PCA degradation increased as the FeS dose and persulfate concentration increased. PCA removal, dechlorination, and TOC removal reached over 99% within 60, 210, and 500 min, respectively. Generation of small amounts of amorphous iron oxide precipitants on the residual FeS surface was, observed and FeS recyclability was conducted preliminarily. These findings suggest that FeS can function as an effective persulfate activator for PCA control.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 15
·3196-3203
·
IF 1.915
Jing-Nie,Yang-Guang Wang,Li-Ye Yang,Wei-Jian Wu,Di Yu,Xiao-kun OuYang
In this study, the dissipation and enantioselective degradation of trichlorfon (TF) enantiomers in mariculture pond water was investigated under various conditions using a chiral HPLC method. The results showed that the TF enantiomers dissipated following first-order kinetics in the mariculture pond water under natural, dark, sterile, and dark and sterile conditions. S-(+)-TF degraded more rapidly than R-(−)-TF under natural and dark conditions, whereas the dissipation of TF enantiomers in mariculture pond water was non-enantioselective under sterile, and dark and sterile conditions. Light and microbial activity played important roles in the dissipation of the TF enantiomers in mariculture pond water, and the TF enantiomers degraded faster at higher temperatures. Microbial activity was found to be responsible for the enantioselectivity under these conditions. The results of the study can be used to evaluate the environmental risk of TF at the enantiomer level.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2022
·Vol. 51
·期 10
·1247-1267
·
IF 2
Yu Yingmin,Li Min,Liu Lanmu,Li Jun,Song Yuhe
In this paper, the separation of the p-xylene and ethylbenzene was explored. The COSMO-SAC-UNIFAC model, σ-profile analysis, solvent power and selectivity were used to screen for a suitable solvent for this process. Then, 1,2,4-trichlorobenzene was selected as target solvent to extract the p-xylene from ethylbenzene. The vapor–liquid-phase equilibrium (VLE) data for binary systems of p-xylene + ethylbenzene, p-xylene + 1,2,4-trichlorobenzene, and ethylbenzene + 1,2,4-trichlorobenzene and ternary system of p-xylene + ethylbenzene + 1,2,4-trichlorobenzene were determined with a modified Rose still at atmospheric pressure (101.3 kPa) and all the binary data passed the Wisniak’s test, which accorded with the thermodynamic consistency. Three thermodynamic models, Wilson, NRTL and UNIQUAC were used to correlate the VLE data and get binary interaction parameters, then the ternary VLE data of p-xylene + ethylbenzene + 1,2,4-trichlorobenzene were estimated based on these model parameters using Aspen Plus V10. The estimation values of the three models are in good agreement with the experimental data. Moreover, the effect of 1,2,4-trichlorobenzene was analyzed and it was found to be an effective candidate extractant for the extractive distillation of ethylbenzene from mixed xylenes.
研究领域:
化学工程
·
热力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）