ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Zhilan Chen,Yi Jiang,Xuebin Lai,Chenhong Zhu,Dapeng Zhang,Hailin Wang
Pentachlorophenol (PCP) - cadmium (Cd) complex pollution has been identified as a form of persistent soil pollution in south China, exerting detrimental impacts on the indigenous soil bacterial communities. Hence, it is worthwhile to investigate whether and how bacterial populations alter in response to these pollutants. In this study, Escherichia coli was used as a model bacterium. Results showed that PCP exposure caused bacterial cell membrane permeability changes, intracellular ROS elevation, and DNA fragmentation, and triggered apoptosis-like cell death at low exposure concentration and necrosis at high exposure concentration. Cd exposure caused severe oxidative damage and cell necrosis in the tested bacterial strain. The co-exposure to PCP and Cd elevated the ROS level, stimulated the bacterial caspase activity, and induced DNA fragmentation, thereby leading to an apoptosis-like cell death. In conclusion, PCP-Cd complex pollution can cause bacterial population to decrease through apoptosis-like cell death pathway. However, it is worth noting that the subpopulation survives under the complex pollution stress.
研究领域:
微生物学
·
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Jiannan Chen,Xiuhua Xia,Peizhen Li,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao,He Qian,Yuliang Cheng
Natural N and S co-doped carbon dots (NSCDs) were synthesized via hydrothermal synthesis using food-derived crawfish shells as green precursors. The relationship between quantum yield (QY) and protein content of six crawfish shells treated with different alkalis was investigated. The synthesized NSCDs displayed a large QY of 18.57 %, which was higher than most of the chitin-derived CDs. Due to the oxidation of hydroxyl radicals, adding H 2 O 2 and horseradish peroxidase (HRP) quenched the fluorescence of NSCDs, resulting in a detection limit (LOD) of 1.25 μM for H 2 O 2 . The addition of pentachlorophenol (PCP) was supposed to consume part of the hydroxyl radicals and protect NSCDs from being oxidized. Accordingly, a facile and rapid “off–on” fluorescence sensor was developed to detect PCP with a LOD of 2.30 μM. Further, the method described was successfully used to detect PCP in three real samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Technology & Innovation
·
2022
·
IF 7.758
Yu-Xiang Shi,Lei Li,Da-Mao Xu,Rong-Bing Fu
In this study, inorganic and organic radicals generated from a thermally activated peroxyacetic acid (PAA) system were used to degrade pentachlorophenol (PCP) in contaminated soils. In addition, the effects of various operating parameters on PCP removal were fully considered, including reaction temperature, PAA dosage, initial pH and natural organic matter (NOM). The experimental results showed that PCP was more easily degraded under the conditions that temperature was higher than 40 °C and near neutral pH, and PAA dosage was more than 750 mM/kg. In contrast, humic acid (HA) exhibited a significant inhibitory impact on PCP degradation. The results from the chemical quenching and electron para-magnetic resonance (EPR) experiments further indicated that in the PAA system, HO• has much better degradation ability for PCP than 1 O 2 . Moreover, the degradation of PCP was dominated by R-O• radicals, including CH 3 C(O)O• and CH 3 C(O)OO•. Besides, the potential degradation pathways of PCP by PAA system were investigated, based on the degradation intermediates and the density functional theory (DFT) calculation. The present study results indicated that the combined process of PAA and heat treatment has a significantly high efficiency in the degradation of chlorobenzenes in soils. This study is the first to use thermally activated PAA for soil remediation without the use of other chemicals as activators, and provides a novel, efficient and economical technique for the remediation of actual chlorinated hydrocarbon contaminated sites.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED GEOCHEMISTRY
·
2013
·
IF 1.708
Liping Lou,Feixiang Liu,Qiankun Yue,Fang Chen,Qiang Yang,Baolan Hu,Yingxu Chen
Black carbon (BC), especially biochar, is a potential material for the remediation of hydrophobic organic compounds (HOCs) pollution in soils and sediments. Recent studies have reported that the adsorption capability of BC in sediment was reduced as time increased. It was hypothesised that this behaviour was caused by the presence of natural organic matter (NOM), but few systematic studies have examined the influence of NOM on the sorption ability of BC in sediment (S). The results of this study revealed that a humic acid (HA) coating changed the surface properties, blocked the micropores, and decreased the sorption capacity of rice-straw biochar (RBC) towards pentachlorophenol. With increasing aging time, the reductions in the sorption capacity of the S + RBC and S + HA + RBC systems occurred more rapidly than in the S + HA/RBC (HA-coated RBC) system, and the sorption curves became closer to that of the S + HA/RBC system, indicating that HA may play a primary role in reducing the sorption capacity of RBC in the sediment. With higher HA contents, the sorption capacity of the complex sediments was lower and decreased more rapidly.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2013
·
IF 3.258
Fanfeng Zeng,Yan He,Zhenghua Lian,Jianming Xu
Hematite nanoparticles (NPs) were studied as a sorbent for hydrophobic organic contaminants (OCs) under natural ambient conditions through specially designed contrasting solution chemistry of electrolyte. Ionizable pentachlorophenol (PCP) and non-ionizable phenanthrene (PHE) were selected as representative OCs. The sorption capacities of PCP and PHE were pH-dependent, and a larger amount of PCP was sorbed at pH values below its pK a (4.75). However, the PHE sorption capacity was higher at relatively high or low pHs (e.g. below 4.0 and above 10.0), possibly due to the larger available surface area of the hematite NPs, caused by the higher values of net charges and charge density. Changes in pH might thus affect the sorption of OCs by hematite NPs, through modification of the surface characteristics of the sorbent and the electronic properties of the sorbate molecules. The influence of different ionic strengths indicated that the amounts of PCP and PHE sorbed by hematite NPs decreased as a concentration function of different types of ions (e.g. Na + , K + , Mg 2 + and Ca 2 + ), with the underlying mechanism possibly being due to four interactions i.e. hydrogen-bonding, competitive sorption by ions in the ambient solution, screening effects and aggregation effects. The results confirmed that the surface chemistry of hematite NPs, the chemical properties of PCP and PHE, and solution chemistry (e.g. pH and ionic strength) of the electrolyte all played an important role in PCP and PHE sorption by hematite NPs. By comparison of both sorption capacity and ecologic advantages, our results suggested that natural hematite NPs would be more competitive and efficient for PCP and PHE sorption than engineered NPs. This finding increases our knowledge regarding the environmental function of natural NPs (such as hematite NPs) for OC remediation through manipulating their interfacial behavior.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2014
·
IF 2.063
Bin Yang,Dan Xu,Xiaolin Wu,Zhongjian Li,Lecheng Lei,Xingwang Zhang
Poly ( N -isopropyl acrylamide- co -butyl acrylate) (PNIPAM-BA) hydrogels were synthesized by copolymerization of N -isopropyl acrylamide (NIPAM) with butyl acrylate (BA), which have been proposed as adsorbents for the efficient removal of hydrophobic organic pollutants , e.g . pentachlorophenol (PCP). Adsorption experiments showed high removal efficiencies of PCP. The isotherm experimental data of PCP fitted Langmuir model, and the adsorption capacity of PNIPAM-11% BA hydrogel was greater than that of the original PNIPAM hydrogel. It is possibly due to the enhanced interaction between the hydrophobically modified hydrogels and PCP. Moreover, the PNIPAM-BA hydrogels could be easily recycled by the desorption process at 323 K in solution.
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
Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 11
·2567-2579
·
IF 5.819
Fang Cheng,Jun Hou,Jun Wu,Yi Xu,Lingzhan Miao,Jun Xia,Zongli Huo
pentachlorophenol (PCP) is a kind of chlorinated aromatic contaminant that brings challenges from an environmental perspective. However, the performance of sulfidated nanoscale zero-valent iron (S-nZVI) in PCP removal remains unknown. In this study, S-nZVI was applied in the treatment of PCP-polluted water under different water chemistry conditions. The results showed that PCP was removed under the combined action of adsorption, dechlorination, and ˙OH-mediated oxidation, among which dechlorination played a leading role while oxidation lagged behind. The amount of adsorbed PCP correlated well with the PCP dechlorination rate constant (kred), except for S/Fe 0 and 0.1 and acidic initial pH (pHinitial) conditions. At neutral and alkaline pHinitial, kred increased with an increase in pHinitial due to the formation of a hydroxide layer that facilitates adsorption. At acidic pHinitial, kred increased with a decrease in pHinitial because hydrogen ions diffusing in the solution participated in the reaction. The effects of solution chemistry, such as anions, organic matter, and oxygen conditions, on PCP adsorption and transformation were also studied. Eight degradation byproducts were observed; the dechlorination products suggested that PCP dechlorination by S-nZVI occurred via a sequential pathway. PCP and its dechlorination products would then undergo ˙OH-mediated oxidation, resulting in products that are beneficial for microbes. Changes to S-nZVI after reacting and the role of sulfur were also discussed. This study confirmed that S-nZVI can be effective in the remediation of PCP-polluted groundwater. Further research is needed to optimize this remediation via coupling microbial technology and controlling the oxygen conditions.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Huanxin Zhang,Yu Zhang,Shixuan Cui,Lihua Cui,Jiaxin Li,Jizhuang Chu,Yumiao Zhou,Youru Zhang,Qiang Kong
Pentachlorophenol (PCP) is widely distributed in marine environments and poses a threat to the health of marine organisms. Recent studies have demonstrated that PCP induces energy deficiency in marine organisms. However, the underlying toxification mechanism and the resulting adverse outcomes remain unclear. This study analyzed the energy metabolism of marine medaka ( Oryzias melastigma ) exposed to PCP at environmentally relevant concentrations via proteomic analysis and multiple physiological assessments. The results showed that PCP disrupted mitochondrial morphology, reduced mitochondrial membrane potential (MMP), and decreased adenosine triphosphate (ATP) levels in marine medaka. Proteomic analysis revealed that PCP induced oxidative stress, cytoskeletal disruption, and inhibition of the cytochrome bc1 complex and ATP synthase. These effects culminated in structural and functional impairments to mitochondria, which in turn inhibited ATP synthesis. Chronic PCP exposure led to enhanced glycolytic activity, the accumulation of liver lipids, and reduced liver function. The present study has deepened our understanding of the mechanism of PCP-induced energy production deficiency in marine fish and provides new insights into ecological risk assessment for PCP.
研究领域:
环境科学
·
毒理学
·
海洋生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Linning Yin,Junyan Wei,Yumeng Qi,Zhengnan Tu,Ruijuan Qu,Chao Yan,Zunyao Wang,Feng Zhu
In this work, we systematically investigated the transformation of pentachlorophenol (PCP) in the heat-activated peroxymonosulfate (PMS) system. The degradation efficiency of PCP increased with initial PMS concentration, temperature and pH. The calculated % reaction stoichiometric efficiency (RSE) reached up to 92.2%. SO 4 2− was found to promote the degradation of PCP, because it significantly enhanced the generation of HO • and SO 4 •− as confirmed by EPR experiments. According to the radical quenching tests, SO 4 •− was the dominant reactive radical for PCP degradation. A total of 10 intermediates were identified, and hydroxylation, sulfate addition, dechlorination and oligomerization were speculated as main reaction pathways. Then, possible reactions between reactive radicals and substrate were calculated at the m062x/land2dz level to interpret the mechanisms of different reactions. It was found that ionic PCP had lower activation energy than molecular PCP, and hence showed higher reactivity towards SO 4 •− and HO • in the course of radical addition reaction. As for the coupling reaction, SO 4 •− more likely to react with ionic PCP to generate phenoxy radicals than HO • , due to the negative Gibbs free energy change. Meanwhile, the abstraction of an Cl atom by HO • was confirmed to be the first step for the formation of dechlorination products. In addition, toxicity evaluation by ECOSAR and TEST programs illustrated that the toxicity of reaction products was all lower than that of PCP. Findings of this work demonstrated the feasibility of this PMS/heat method for effective removal of PCP in contaminated waters.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Keyi Li,Yue Lai,Senpei Lin,Lihua Zhou,Minghao He,Huayue Lin,Yong Yuan
Chlorophenols (CPs) pose significant risks to human health due to their toxicity and carcinogenic properties. The direct oxidative breakdown of CPs can produce even more harmful byproducts, resulting in secondary pollution. There is a pressing need for a technology capable of both reducing and oxidizing CPs for their removal. For this research, we utilized commercially accessible organic polymer fluorinated ethylene propylene (FEP) as a catalyst, activated through ultrasound to kickstart a contact-electro-catalysis process to degrade pentachlorophenol (PCP). A proposed mechanism is presented for the reduction and oxidative breakdown of PCP relying on contact electrification-induced electron transfer that creates reactive species. Experimental findings demonstrate that PCP can be completely degraded with only 1.0 mg of FEP. Experiments on identifying and quenching reactive oxygen species indicate that •O2−, •OH, and 1O2 play a role in the degradation process. The degradation of PCP involves four pathways: direct dechlorination, hydroxylation dechlorination, oxidation, and polymerization. Toxicity assessment reveals that the dechlorination process notably decreases the toxicity of intermediates. Furthermore, characterization and cycling experiments demonstrate the outstanding stability and recyclability of FEP, making it suitable for real environmental water applications. Ultrasound-driven contact-electro-catalysis system offers a straightforward, economical, and eco-friendly approach to degrade PCP. It offers valuable insights for potentially treating stubborn CPs effectively.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Boying Liu,Junyan Wei,Shengnan Zhang,Asam Shad,Xiaosheng Tang,Ahmed A. Allam,Zunyao Wang,Ruijuan Qu
In this study, the catalytic performance of α-Fe 2 O 3 nanoparticles (nα-Fe 2 O 3 ) in the low-dose ferrate (Fe(VI)) system was systematically studied through the degradation of pentachlorophenol (PCP). Based on the established quadratic functions between nα-Fe 2 O 3 amount and observed pseudo first-order rate constant ( k obs ), two linear correlation equations were offered to predict the optimum catalyst dosage and the maximum k obs at an applied Fe(VI) amount. Moreover, characterization and cycling experiments showed that nα-Fe 2 O 3 has good stability and recyclability . According to the results of reactive species identification and quenching experiment and galvanic oxidation process , the catalytic mechanism was proposed that Fe(III) on the surface of nα-Fe 2 O 3 may react with Fe(VI) to enhance the generation of highly reactive Fe(IV)/Fe(V) species, which rapidly extracted a single electron from PCP molecule for its further reaction. Besides, two possible PCP degradation pathways, i.e., single oxygen transfer mediated hydroxylation and single electron transfer initiated polymerization were proposed. The formation of coupling products that are prone to precipition and separation was largely improved. This study proved that nα-Fe 2 O 3 can effectively catalyze PCP removal at low-dose Fe(VI), which provides some support for the application of Fe(VI) oxidation technology in water treatment in the context of low-carbon emissions.
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
Analytical Methods
·
2016
·Vol. 9
·期 3
·459-464
·
IF 1.915
Weiwei Bian,Sha Zhu,Mingying Qi,Lanlan Xiao,Zhen Liu,Jinhua Zhan
Pentachlorophenol (PCP) is a very high toxicity and slowly biodegraded organic pollutant. People may be exposed to PCP in environmental media through the inhalation of contaminated air, and ingestion of water and hazardous waste. Even low PCP intake will have serious effects on renal, metabolic and neurological functions, particularly in terms of carcinogenicity. Here, an electrostatic interaction driven solid phase microextraction (SPME) combined with surface enhanced Raman spectroscopy (SERS) was proposed for rapid detection of PCP in environmental water. The nanoporous Ag coating was in-situ electrochemically synthesized and modified by cysteamine to form a positive stationary phase on a fiber surface. The PCP was extracted using the DI-SPME mode and its SERS spectra were investigated; the characteristic bands at 338 cm−1, 378 cm−1 and 480 cm−1 were identified as the fingerprint peaks. The extraction procedure was optimized, and the adsorption mechanism was also discussed by the electric double layer model. The good stability and uniformity of the substrate provide a high enhancement factor of 3.7 × 105 and low LOD of 6.4 × 10−9 M for quantitative determination. This work provides a versatile strategy for rapid on-site detection of ionic or polar organic pollutants in environmental media.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
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