RADIATION PHYSICS AND CHEMISTRY
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2024
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IF 2.8
Qin Wen,Shizong Wang,Jianlong Wang,Hai Chen,Yuedong Zhou
In this study, the degradation and mineralization of 2-chlorobiphenyl (2-PCB) by gamma irradiation were investigated in the presence of persulfate (PS), to examine the synergistic effect of radiation and persulfate oxidation. The results showed that the absorbed dose required for complete removal of 2-PCB decreased in the presence of PS. In addition, compared to a single irradiation system, the removal efficiency and mineralization of 2-PCB in deionized water , groundwater, and secondary effluent increased when irradiation combined with PS. 2-PCB at concentration of 4 mg L −1 to 8 mg L −1 could be efficiently degraded at a wide pH range (3.0–9.5) in irradiation-activated PS (irradiation/PS) system. The presence of 10 mM or 100 mM of Cl − , NO 3 − , CO 3 2− , and SO 4 2− in irradiation/PS system had no obvious influence on 2-PCB removal. 2-PCB was degraded under the combined action of sulfate radicals (SO 4 •− ) and hydroxyl radicals (·OH), in which ·OH contributed more. The irradiation/PS system is promising to treat PCB-containing wastewater.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2013
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IF 3.925
Zhiqiao He,Junjun Sun,Jie Wei,Qiong Wang,Chengxiang Huang,Jianmeng Chen,Shuang Song
To enhance the activity of chemi-deposited palladium/nickel foam (Pd/Ni) electrodes used for an electrochemical dechlorination process, silver or copper was deposited electrochemically onto the nickel foam substrate (to give Ag/Ni or Cu/Ni) before the chemical deposition of palladium. The physicochemical properties of the resulting materials (Pd/Ni, Pd/Ag/Ni and Pd/Cu/Ni) were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and their electrochemical catalytic activities were evaluated by monitoring the electrochemical dechlorination of 2-chlorobiphenyl (2-CB) in strongly alkaline methanol/water solution. The results show that the Pd/Ag/Ni and Pd/Cu/Ni electrodes had consistently higher electrocatalytic activities and current efficiencies (CEs) compared with the untreated Pd/Ni electrode. The Pd/Ag/Ni electrode exhibited the highest activity. The dechlorination was also studied as a function of Pd loading, the Ag or Cu interlayer loadings, and the current density. The Pd loading and the interlayer loadings both had positive effects on the dechlorination reaction. Increasing the current density increased the reaction rate but reduced the CE. The improvement of the electrocatalytic activities of the Pd/Ni electrode by applying the interlayer of Ag or Cu resulted from the enlargement of the effective surface area of the electrode and the adjustment of the metal H bond energy to the appropriate value, as well as the effective adsorption of 2-CB on Ag. Moreover, the high catalytic activity of the Pd/Ag/Ni electrode was maintained after six successive cyclic experiments, whereas Pd/Cu/Ni electrodes deactivate severely under the same conditions.
研究领域:
环境科学
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电化学
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产品关联
DOI
PubMed
高影响因子
PEST MANAGEMENT SCIENCE
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2021
·Vol. 77
·期 6
·2773-2784
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IF 4.845
Yang Yang,Qiuyan Zhu,Kun Zhang,Suqing Zhao
BACKGROUND Aedes albopictus is a mosquito species and a vector of dengue virus and malaria parasites that represents a significant threat to global public health. Although mosquito populations have been effectively controlled through the use of synthetic insecticides, the emergence of widespread insecticide resistance in wild mosquito populations is a strong motivation to explore new insecticidal chemistries. RESULTS In this study, A. albopictus was treated with a series of novel pyrethroids containing 2-chlorobiphenyl and 2-chlorophenylpyridine via topical application. The relative antimosquito activity of each novel compound was determined, as measured by the LC 50 , and compared with the synthetic pyrethroid bifenthrin. The most antimosquito activity compound (SZ-B-11) was 4.69 times more active than bifenthrin. The novel compounds were also sensitive to wild A. albopictus . In addition, in silico toxicity assessment of aquatic organisms showed that the acute toxicity and chronic toxicity of SZ-B-11 were 31.96 times and 934.40 times lower than those of bifenthrin, respectively. Cytotoxicity assessment demonstrated that all tested compounds were nontoxic against SH-SY5Y cell lines. Furthermore, photolytic results suggested that SZ-B-11 would be photodegraded more easily than bifenthrin and would reduce secondary pollution. CONCLUSION Novel pyrethroids containing 2-chlorobiphenyl and 2-chlorophenylpyridine, through simple synthesis steps, have better antimosquito activity, low resistance, less ecotoxicity, readily degradable characteristics, and may reduce secondary pollution. They are promising insecticides with potential application prospects in agricultural production and environmental protection. © 2021 Society of Chemical Industry
研究领域:
害虫控制
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昆虫毒理学
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环境化学
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公共卫生
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2017
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IF 3.981
Dandan Li,Jun Zhu,Man Wang,Wentao Bi,Xiaohua Huang,David Da Yong Chen
A velvet-like magnetic carbon nitride nanocomposites synthesized by chemical co-precipitation was used to develop a highly efficient magnetic solid-phase extraction method for the pre-concentration of trace polychlorinated biphenyls (PCBs) in water samples. The advantages of this nanocomposite such as large surface area, good dispersity, low solvent consumption, rapid analyte adsorption (30 s) and reusability make it a good sorbent. Factors affecting extraction efficiency were systematically investigated and optimized by response surface methodology (RSM). Under optimal experimental conditions, the limits of detection (LODs S/N = 3) of the developed method for PCBs investigated were in the range of 9.0 × 10 −6 –5.8 × 10 −5 μg/mL. This method was then used for the analysis of four real water samples. Good spiked recoveries over the range of 80.1-118.4%, and RSDs (n = 5) of 0.02–3.7% were obtained. This work demonstrated the potential of using this nanocomposite for adsorption, pre-concentration, or even removal of different carbon-based aromatic compounds or other hydrophobic pollutants.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2013
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IF 3.777
Zhiqiao He,Keji Lin,Junjun Sun,Lina Wen,Chao Gao,Jianmeng Chen,Shuang Song,Yanyun Qian,Weiping Liu
A kinetic model for the electrochemical dechlorination of polychlorinated biphenyls (PCBs) will be an important contribution to the design and optimization of a continuous reactor. Initially, the electrocatalytic hydrodechlorination of 2-chlorobiphenyl (2-ClBP) to biphenyl at a palladium-modified nickel foam (Pd/Ni) cathode in a batch reactor was used as a model reaction for a quantitative study of the influences of the operating parameters, including temperature, the initial concentrations of PCBs, current density and the amount of Pd loading, on the apparent reaction rate. The dechlorination was found to follow pseudo first-order kinetics with respect to the 2-ClBP concentration. It was also found that a simple global power law rate equation , with Arrhenius dependency, can be used to describe the correlation between the pseudo first-order reaction rate constants and the reaction conditions. Subsequently, a mathematical model for predicting the performance of reductive dechlorination of 2-ClBP on Pd/Ni electrodes in a continuous stirred tank reactor was constructed, based on the batch-reaction kinetics. The suitability of the model was validated by performing experiments in and out of the range of reaction conditions applied in the batch reactor. The results show that the calculated values are a good fit to the experimental data.
研究领域:
环境科学
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电化学工程
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Wei Guo,Yao Qin,Cheng Liu,Binbin Guo,Junhua Zou,Zenghong Xie,Ling Wu
This work reports the rapid and effective photocatalytic dechlorination of 3,3′,4,4′-trtrachlorobiphenyl (PCB77) with highly dispersed Pd nanoclusters loaded two-dimensional (2D) TiO 2 (B) nanosheets (Pd/TiO 2 (B)) under visible light irradiation, achieving a dechlorination efficiency of 100 % with H 2 O used as an H-donor source. The ultra-thin TiO 2 (B) nanosheets provide a good platform for studying the dechlorination intermediates/pathways of PCB77 at the molecular level. It is proved that the dechlorination of PCB77 is a stepwise process, in which chlorines at the para positions are much more susceptible than those at the meta positions due to the activation of the C Cl bond in the presence of Pd nanoclusters. Furthermore, in-situ FTIR results of D 2 O absorption suggest that the TiO 2 (B) nanosheets with abundant surface defects greatly promote the activation of water molecules via the formation of surficial complexes by hydrogen bonds. Finally, a synergistic mechanism is proposed for photocatalytic dechlorination of PCB77 over Pd/TiO 2 (B). The study provides an efficient method for complete dechlorination of PCB77 and an in-depth understanding photocatalyzed dechlorination reaction mechanism at the molecular level, which may extend to other photocatalytic dehalogenation reactions of halogenated pollutants.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Luyi Chen,Junlong Huang,Yueru Shi,Xiaoru Peng,Yixin Kuang,Suxin Zhou,Juan Zheng,Xin Yang,Gangfeng Ouyang
Systematic investigation on the adsorption performance of polystyrene-based nanospheres towards persistent organic pollutants (POPs) is of great importance to the design of high-capacity adsorbent and the toxicological risk assessment of nano plastic. In this study, a series of polystyrene-based nanospheres with controllable microstructures, have been constructed successfully as model adsorbents, by the strategies of emulsion polymerization, hyper-crosslinking and direct carbonization. In the form of Solid phase microextraction (SPME) coatings, the impacts of microstructures on the adsorption performance of constructed nanospheres have been highlighted, by employing benzene series, polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) as target adsorbates. Moreover, it is surprisingly found that the grafted F atoms make PS demonstrate better enrichment effects towards PCBs than the Cl atoms, mainly due to stronger sigma (σ)-hole interactions between F atoms and PCBs. In consideration of the most outstanding performance, the F-functionalized nanospheres (xFFNs)-coated SPME fiber is employed for the enrichment of PCBs from water samples, and the enrichment factors range from 1500 to 10030. After coupling the xFFNs-coated fiber with gas chromatography-mass spectrometry (GC-MS), highly sensitive analytical method is developed with detection limits of 0.08–0.89 ng L −1 , realizing precise quantifications of trace PCBs in treated sewage samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）