JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Mengyu Zhu,Jun Lu,Linchang Dong,Shuheng Hu,Shuchuan Peng,Chengzhu Zhu
The possible photochemical transformation pathways of chlorophenols (2, 6-dichlorophenol and 2-chlorophenol) with superoxide anion radical (O 2 ·− ) were studied by steady-state irradiation and 355 nm laser flash photolysis technique. O 2 ·− was generated by irradiating riboflavin O 2 -saturated solution with an UVA light (maximum at 365 nm). The steady-state experimental results suggested that the transformation efficiency of chlorophenols improved with the increase of the initial riboflavin concentration and solution initial pH value, while the increase of chlorophenols concentration would inhibit the photochemical reaction. The second-order rate constant of the reaction of O 2 ·− with 2, 6-DCP phenoxyl radical (2, 6-DCP · ) and 2-CP phenoxyl radical (2-CP · ) were determined as (8.39 ± 0.99) × 10 9 L mol −1 s −1 and (5.17 ± 0.68) × 10 9 L mol −1 s −1 by laser flash photolysis techniques, respectively. The transformation of chlorophenols was accompanied by the formation of Cl − induced by superoxide radicals after the mixed riboflavin and chlorophenols solution with UVA irradiation. The main conversion products of the reaction between 2, 6-DCP and O 2 ·− were identified by GC-MS, as 2-chlorophenol, 2, 6-dichloro-1, 4-benzoquinone, 2, 6-dichloro-hydroquinone and 3-chlorocatechol, while 2-CP with O 2 ·− was 2-chloro-1, 4-benzoquinone, 2-chlorohydroquinone and phenol, respectively. The transformation pathways of 2, 6-DCP and 2-CP with O 2 ·− were also proposed.
研究领域:
环境科学
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化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2016
·Vol. 23
·期 19
·19266-19280
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IF 2.76
Yang Hui,Hu Yuanan,Cheng Hefa
Sorption of 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP) on a range of dealuminated zeolites were investigated to understand the mechanism of their sorption on microporous minerals, while the influence of common metal cations, solution pH, and humic acid was also studied. Sorption of chlorophenols was found to increase with the hydrophobicity of the sorbates and that of the microporous minerals, indicating the important role of hydrophobic interactions, while sorption was also stronger in the micropores of narrower sizes because of greater enhancement of the dispersion interactions. The presence of metal cations could enhance chlorophenol sorption due to the additional electrostatic attraction between metal cations exchanged into the mineral micropores and the chlorophenolates, and this effect was apparent on the mineral sorbent with a high density of surface cations (2.62 sites/nm 2 ) in its micropores. Under circum-neutral or acidic conditions, neutral chlorophenol molecules adsorbed into the hydrophobic micropores through displacing the “loosely bound” water molecules, while their sorption was negligible under moderately alkaline conditions due to electrostatic repulsion between the negatively charged zeolite framework and anionic chlorophenolates. The influence of humic acid on sorption of chlorophenols on dealuminated Y zeolites suggests that its molecules did not block the micropores but created a secondary sorption sites by forming a “coating layer” on the external surface of the zeolites. These mechanistic insights could help better understand the interactions of ionizable chlorophenols and metal cations in mineral micropores and guide the selection and design of reusable microporous mineral sorbents for sorptive removal of chlorophenols from aqueous stream.
研究领域:
环境科学
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化学工程
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水处理
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DOI
PubMed
高影响因子
Catalysis Science & Technology
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2022
·Vol. 12
·期 10
·3209-3218
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IF 6.177
Meng Tian,Jing Qian,Jiawei Hou,Yadi Bai,Hai-Ying Jiang,Jingyun Ren
Free silver ions (Ag+) in the solution exhibit enhanced photocatalytic dechlorination processes of organic chloride, including 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP), over copper phenylacetylene (PhC2Cu) under visible light irradiation. The concentration of AgNO3 remarkably affects the dechlorination activity of PhC2Cu. With the optimal concentration of 2 mM AgNO3, PhC2Cu showed the best photocatalytic performance, and the dechlorination rate of PhC2Cu was 2.3-fold enhanced under visible light irradiation for 80 minutes. This deep mechanism study demonstrated that free Ag+ in the solution, but not the deposited Ag particles on the surface of PhC2Cu, plays the most imported role in promoting the photocatalytic dechlorination process by forming the insoluble salt of AgCl.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
Desalination and Water Treatment
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2015
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IF 1.173
Ping Yu,Qilong Sun,Jianfeng Li,Jianming Pan,Zhenjiang Tan,Yongsheng Yan
Poly(styrene-divinyl benzene) (St-DVB) magnetic porous microspheres were prepared by sulfonation for the adsorption of 2,4-dichlorophenol(2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP) from aqueous solution. The as-prepared microspheres were characterized by FT-IR, XRD, SEM, TGA, VSM, and N2 adsorption–desorption techniques, showing that the as-prepared microspheres were porous and had good magnetism (Ms = 40 emu g−1). The adsorption performance of St-DVB magnetic porous microspheres were investigated by batch mode adsorption experiments with respect to pH, temperature, initial concentration, and contact time. The St-DVB magnetic porous microspheres were sensitive to pH. The equilibrium data was better fitted to the Langmuir isotherm model than the Freundlich model. The kinetics experimental data was well fitted to the pseudo-second-order model. The thermodynamic parameters were calculated by the Gibbs free energy function, revealing that the adsorption process was spontaneous and endothermic. Furthermore, the St-DVB magnetic porous microspheres had good recycling performance.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Ge Song,Ruiheng Liang,Jiayi He,Jiangli Sun,Chunhong Fu,Shuaishuai Li,Jiana Jing,Minghua Zhou
Chlorophenols are widely used in production but are listed as priority pollutants due to their high toxicity. Traditional reduction or oxidation processes fail to achieve oxidation, dechlorination, and detoxification of chlorophenols. To address this, this study developed an efficient photoelectrochemical activation of sulfite (P UV EC/sulfite) process, combining reduction and oxidation to remove 4-chlorophenol (4-CP). P UV EC/sulfite achieved near complete removal and dechlorination for 1–10 mg L −1 4-CP within 40 min. The types and contributions of active species of P UV EC/sulfite process were explored by capture experiment and EPR test, observing that in the early stages of the reaction, reductive species such as e aq - and H* dominated while oxidative species such as • OH, O 2 •- and 1 O 2 became predominant in the later stages. P UV EC/sulfite improved the removal and dechlorination compared to reduction and oxidation alone, significantly reduced the toxicity of the pollutants. This study presents a new method for removing chlorinated organic compounds, providing new insights into the treatment of chlorinated organics.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Catalysts
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2024
·Vol. 14
·期 7
·424
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IF 3.8
Mingyue Liu,Gang Chen,Zhenjun Song,Zhicai He,Aiguo Zhong,Mei Cui
Catalytic dechlorination of organic chlorides by palladium (Pd) with HCOOH represents one of the most effective and promising techniques for environmental remediation. In this study, we adopted alkaline-modified porous natural sponge as support of a Pd nanocatalyst (Pd@M-Sponge) and HCOOH as a hydrogen source for the hydrodechlorination of florfenicol (FF),o-chlorophenol (o-CP), andp-chlorophenol (p-CP). Favorable conversion efficiency of FF,o-CP, andp-CP was achieved at 25 °C and atmospheric pressure attributed to the small diameter and high catalytic reactivity of the prepared Pd NPs, in addition to the slight internal mass transfer limitation of the prepared Pd@M-Sponge. High reaction rate constants were obtained even in the conditions of a low molar ratio of HCOOH top-CP (10:1) and a high concentration ofp-CP (500 mg/L). The prepared catalyst also demonstrated superior recyclability without any obvious decrease in catalytic reactivity in 20 successivep-CP dechlorination cycles. This work provides an ideal recyclable and cost-effective catalyst based on renewable and biocompatible natural material for the catalytic hydrodechlorination of chlorinated organic pollutants with formic acid and a new view for the exploration and designing of highly reactive and stable catalysts for hydrodechlorination.
研究领域:
环境科学
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催化
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纳米技术
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化学工程
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DOI
高影响因子
WATER RESEARCH
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2024
·
IF 11.4
Yu-Jia Nong,Qian-Yuan Wu,Yun-Peng Wu,Ju-Won Lee,Min-Yong Lee,Wen-Long Wang
The KrCl-excimer lamp, emitting far-UVC light at 222 nm (UV222), offers a promising alternative to conventional UVC light at 254 nm (UV254) for the photolysis of organic pollutants and the activation of radical sensitizers. This study was aimed to investigate the efficiencies of UV222 in the treatment of halogenated aromatics, focusing on its performance in degradation, dechlorination and detoxification. Chlorophenols, representative recalcitrant and toxic halogenated aromatics, were used as target pollutants. The pathways of direct photolysis, photooxidation and photoreduction under UV222 illumination were compared. UV222 outperformed UV254 in photolyzing chlorophenols (1.4−34.1 times faster), especially protonated chlorophenols, due to substantially higher UV absorption (17.1−108.0 times) and quantum yields (2.1−3.4 times). The quantum yields of chlorophenols were influenced by the inducive electron-withdrawing effect of Cl-substitutes. Moreover, UV222 improved the dechlorination of chlorophenols to 95 % compared to 60 % by UV254. The introduction of radical sensitizer (e.g., H 2 O 2 , nitrate, and sulfite) reduced 4-chlorophenol photolysis by competing for UV222 absorption, though the sensitizers partially increased radical oxidation via generating • OH or e aq − . UV222 photolysis of 4-chlorophenol increased the toxicity by 88.6 times through forming toxic intermediates (e.g., hydroquinone and resorcinol). Notably, • OH and e aq − (i.e., UV222/H 2 O 2 and UV222/sulfite) increased the dechlorination and • OH (i.e., UV222/H 2 O 2 ) detoxified the mixture solution. Moreover, UV222 photolysis remained effective for 4-chlorophenol removal in real paper-mill wastewater, indicating the potential application of KrCl* lamp UV222.
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
PubMed
高影响因子
Coatings
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2023
·Vol. 13
·期 3
·655
·
IF 3.4
Yuxin Bai,Shasha Xu,Jing Chen,Xun Sun,Shan Zhao,Jingcai Chang,Zuoli He
Ternary heterojunction photocatalysts can improve the transport and separation of photogenerated electrons and holes, which could promote their reduction and oxidation properties for environmental and energy applications. In this research, the ternary photocatalyst Ti3C2@TiO2/g-C3N4was successfully synthesized via direct electrostatic self-assembly during hydrothermal process. Ti3C2MXene was used to optimize the interfacial carrier transport and separation between the interfaces. The obtained ternary heterostructured photocatalyst had a higher photocatalytic degradation performance for removing rhodamine B (RhB) and 4-chlorophenol (4-CP). The synergistic effect of heterojunction between g-C3N4and TiO2and Schottky barrier presented among TiO2and Ti3C2suppressed the recombination of the photogenerated electron–hole pairs. Moreover, the Ti3C2can serve as an active site for the adsorption and activation of organic pollutants resulting from sufficient functional groups (F−here).Keywords:Ti3C2;g-C3N4;heterojunction;photocatalyst;4-chlorophenol
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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DOI
高影响因子
CHEMOSPHERE
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2020
·
IF 5.778
Haopeng Luo,Xin Zhou,Xiaojie Guo,Zhiyong Fang,Quanyuan Chen,Juan Zhou
The greatest constraint in the advanced oxidation processes involved Fe(II)/PMS was the low utilization of Fe(II) and PMS. In the present study, the co-catalytic effect of WS 2 on the Fe(II)/PMS system for the degradation of organics was investigated. In the presence of WS 2 , Fe(III) was reduced to Fe(II) during the reaction and resulted in improved decomposition of PMS as well as the degradation of 4-chloriphenol (4-CP). The decomposition rate of PMS and degradation efficiency of 4-CP were 10% and 25% in the Fe(II)/PMS process, while the efficiencies respectively increased to 99% and 100% in the WS 2 assisted Fe(II)/PMS system. The degradation of 4-CP was completed via the free radical pathway and SO 4 • - played a more important role than other active species. Low concentration of inorganic ions such as Cl − and HCO 3 − exhibited irrelevant effect while humic acid showed significant suppression on the WS 2 /Fe(II)/PMS system. Additionally, characterization and recycle results implied that WS 2 maintained a good stability during the co-catalytic processes.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
CHEMOSPHERE
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2017
·
IF 4.208
Jinfeng Liu,Limei Sun,Hongqin Zhang,Mengru Shi,Randy A. Dahlgren,Xuedong Wang,Huili Wang
Triclosan (TCS), 2,4,6-trichlorophenol (2,4,6-TCP) and 2,4-dichlorophenol (2,4-DCP) frequently co-exist in real-world aquatic environments; the latter two contaminants contributing to TCS photolytic products or chlorinated derivatives. There is a paucity of information regarding their joint toxicity to aquatic organisms leading us to study their effects on the swimming behavior of zebrafish ( Danio rerio ). Herein, we reported that 0.28 mg/L TDT exposure (mixtures of TCS, 2,4,6-TCP and 2,4-DCP) enhanced 24-hpf embryonic spontaneous movement frequency, 96-hpf larval activity; however, the 0.56 and 1.12 mg/L TDT treatments decreased all of these behavioral endpoints. All adult behavioral tests demonstrated that chronic TDT exposure (0.14 mg/L) led to hyperactivity and restlessness in adult zebrafish. A 0.14 mg/L TD DATE /@ "M/d/yyyy" 11/21/2017T treatment led to anxiety-like behavior in a bottom dwelling test and excessive panic and low hedging capacity in a conditioned place preference test. Social interaction test demonstrated that zebrafish preferred quiet and isolated space in response to TDT stress. Zebrafish memory was significantly decreased in a T-maze experiment. Whole mount in situ hybridization of pax2a and bcl2l11 genes revealed that their differential expression in the brain and skeleton were related to the corresponding phenotypic behavioral abnormality. A series of biomarker and estrogen receptor assays demonstrated that TDT acute exposure caused abnormal energy metabolism and neurological diseases. AO staining revealed that TDT exposure produced vascular ablation in the head, as well as the occurrence of massive apoptosis in the brain. TEM observation showed pyknosis of nucleus following TDT exposure. These results allow assessment of mechanisms for zebrafish abnormal behavior in response to TDT exposure, and are useful for early intervention and gene therapy of contaminant-induced diseases.
研究领域:
环境毒理学
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水生生物学
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分子生物学
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行为生态学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2014
·
IF 4.258
Chun Wang,Ruiyang Ma,Qiuhua Wu,Meng Sun,Zhi Wang
In this paper, porous carbon with a highly ordered structure was synthesized using zeolite ZSM-5 as a template and sucrose as a carbon source. Through the in situ reduction of Fe 3+ , magnetic property was successfully introduced into the ordered porous carbon, resulting in a magnetic porous carbon (MPC). MPC was used as an adsorbent for the extraction of some chlorophenols (2-chlorophenol, 3-chlorophenol, 2,3-dichlorophenol and 3,4-dichlorophenol) from water and peach juice samples followed by high performance liquid chromatography-ultraviolet detection. Good linearity was observed in the range 1.0–100.0 ng mL −1 and 2.0–100.0 ng mL −1 for water and peach juice sample, respectively. The limits of detection ( S / N = 3) were between 0.10 and 0.30 ng mL −1 . The relative standard deviations were less than 5.3% and the recoveries of the method for the compounds were in the range from 87.8% to 102.3%. The results demonstrated that the MPC had a high adsorptive capability toward the four chlorophenols from water and peach juice samples.
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
CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Bo Yang,Jiaxing Zhang,Yunfei Zhang,Shubo Deng,Gang Yu,Jinhua Wu,Hong Zhang,Jianhong Liu
The low-cost Al–Ni alloy particles could achieve high dechlorination activity for 2-chlorophenol (2-CP) with the addition of tetrasodium EDTA (EDTA-4Na) in this study. The species of chelating agent, pH values, and the dosages of chelating agent were investigated for their effects on dechlorination efficiency of 2-CP in solution. EDTA-4Na presented the highest promoting effect for Al–Ni alloy in dechlorination process compared with other chelating agents, which is closely correlated with the conditional stability constant ( K f ′ ) of chelates formed. The optimized result showed that 0.389 mM of 2-CP was completely dechlorinated into phenol using 10 g L −1 of Al–Ni alloy and 10 mM of EDTA-4Na at initial pH 11.0 within 45-min reaction. Recycling tests of the alloy particles showed that Al–Ni alloy coupling with EDTA in aqueous solution exhibited high dechlorination activity and stability before being exhausted. The maintenance of Al–Ni alloy activity for dechlorination was mainly attributed to the promoting effect of EDTA-4Na on Al corrosion, the inherent structure of alloy with Ni crystal homogeneously dispersing into Al substrate, and the change of its surface morphology with more active sites formed by EDTA corrosion.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）