Desalination and Water Treatment
·
2016
·
IF 1.272
Xudong Zheng,Jiangdong Dai,Jianming Pan
In this work, mesoporous attapulgite (mATP) was firstly prepared in the presence of the cetyltrimethylammonium bromide using attapulgite (ATP) as the matrix materials. Then, it was modified by β-cyclodextrin (β-CD) to obtain the β-cyclodextrin/mesoporous attapulgite composites (β-CD/mATP). The characterization of the composites showed that β-CD/mATP composites remained excellent channel structure and the value of the specific surface area was 300.30 m2/g. As-prepared β-CD/mATP was evaluated as sorbents to adsorption of 2,4,6-trichlorophenol (2,4,6-TCP) and 2,4,5-trichlorophenol (2,4,5-TCP). The results of the batch mode experiment revealed that the Langmuir isotherm model fitted the equilibrium data better, while the kinetic data could be described by pseudo-second-order model perfectly. Furthermore, 2,4,5-TCP adsorption onto β-CD/mATP was more affected than that of 2,4,6-TCP in the presence of competitive phenolic compound. In addition, β-CD/mATP possessed excellent regeneration property.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Lide Jin,Ghebretensae Aron Kifle,Yuan Huang,Chunyang Li,Haibo Chen,Minghui Xiang,Chen Wang,Jin Zhang,Zhiyuan Yang,Siyang Li,Zhen Lu,Hui Li
Pyrrhotite (Fe 7 S 8 ) is a natural mineral with multiple valence states of iron and an efficient peroxydisulfate (PS) activator. However, the activation mechanism of PS and the performance of 2,4,6-trichlorophenol (TCP) removal by the Fe 7 S 8 /PS system are not clear. Herein, the hexagonal Fe 7 S 8 sheets were fabricated using the facile one-step solvothermal method, which could enhance PS activation and TCP degradation. The Fe 7 S 8 /PS system removed 94.3% of the TCP within 60 min with an apparent rate constant of 0.052 ± 0.003 min −1 . The dissolution of Fe 7 S 8 during the Fe 7 S 8 /PS activation facilitated the regeneration of Fe 3+ /Fe 2+ redox cycles. Free radical species analysis confirmed the presence of sulfate radical (SO 4 •- ) and hydroxyl radical (•OH). The fundamental involvement of the free radicals was observed in two stages. The first stage (0–5 min) was dominated by the contribution of •OH, whereas, in 2nd stage (5–60 min), the contribution of SO 4 •- exceeded that of •OH. Toxicity prediction studies revealed that degradation intermediates had lower toxicity than TCP. In the reaction column filled with 15 g of quartz sand (QS), the removal efficiency on TCP decreased from 100% to 0% over a period of 30 min to 80 h. In addition, after 155 h, the TCP removal efficiencies of column experiments loaded with 15, 18, and 20 g of QS and Fe 7 S 8 were 33.2%, 44.6%, and 50.2%, respectively. These findings suggested the Fe 7 S 8 /PS system showed high potential for removing TCP from groundwater.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Hong Peng,Jie Cui,Hongju Zhan,Xu Zhang
Magnetic lanthanum doped TiO 2 (Fe 3 O 4 /SiO 2 /La-TiO 2 , referred to magnetic La-TiO 2 ) and undoped magnetic TiO 2 (Fe 3 O 4 /SiO 2 /TiO 2 , referred to magnetic TiO 2 ) hybrid microspheres with uniform magnetic cores (Fe 3 O 4 /SiO 2 ) were synthesized and characterized in this work. The results indicate that the photoactivity of the magnetic La-TiO 2 is much higher than that of the magnetic TiO 2 for the degradation of 2,4,6-trichlorophenol (10 μM) under UV–visible light irradiation ( λ ⩾ 340 nm). The initial degradation rate ( R 0 , μM/min) for the photodegradation of 2,4,6-trichlorophenol (10 μM) in a 2 g/L magnetic La-TiO 2 dispersion is 0.45 μM/min, which is 1.8 times larger than the value obtained in a 2 g/L magnetic TiO 2 dispersion. The activities of these two catalysts decreased after seven cycles use, probably due to the reduction of surface hydroxyl groups and reaction sites. Carboxylate acids and Cl − were detected as advanced oxidation products. Thus, after 120 min of degradation, the treated 2,4,6-trichlorophenol solution showed no toxicity to HeLa cells. The results clearly demonstrate that the magnetic TiO 2 particularly magnetic La-TiO 2 , would be an effective catalyst for the treatment of solutions polluted with chlorophenols.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 2
·025040
·
IF 1.929
Yang Tang,Fang Shen,Hao Huang,Hongyan Shang,Hui Mao,Jun Ma,Yang Liao,Shilin Zhao
Traditional TiO2 photocatalyst has the disadvantages of weak visible-light responsibility, fast combination of photo-generated electron and hole, which significantly degrade its photocatalytic degradation activity. Therefore, fluorine and carbon co-introduced TiO2 was synthesized at a relatively low calcination temperature via a modified sol-gel method, and then be thoroughly characterized to explore the structure-performance relationship. It was found the optimum catalyst FCT-200 prepared at calcination temperature of 200 °C exhibited remarkably enhanced visible-light absorption and restrained photo-generated carrier combination, which should be attributed to the F, C elements co-introduction, lower crystallization degree, and smaller particle size of anatase TiO2. With such advantages, the catalyst therefore demonstrated satisfactory photocatalytic degradation activity for 2,4,6-trichlorophenol (2,4,6-TCP) under visible-light irradiation. The apparent degradation rate reached as high as 0.41971 h−1, almost 42 folds higher than P25. It is anticipated that the fluorine and carbon co-introduced TiO2 photocatalyst presented in this work could provide a new insight into significantly improving the photocatalytic performance of TiO2.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Yunxia Zu,Zhiling Li,Zimeng Zhang,Xueqi Chen,Bin Wu,Shih-Hsin Ho,Aijie Wang
Biological iron reduction and reductive dehalogenation occur in similar ecological environments, however, how Fe(III)/Fe(II) redox cycles impact the microbial dehalogenation processes remains controversial. In this study, the favorable microbial reductive dechlorination activity has been widely observed in iron-rich river sediments by national sampling, with the dechlorination efficiency showing a positive correlation with the concentration of Fe(III). Microcosm experiments demonstrated that the addition of nano-hematite resulted in a maximum increase of 2.16 times in the dechlorination rate constant ( k ) for 2,4,6-trichlorophenol, achieved via synergistic interactions with Fe(III) reduction. Multi-tools, including transcriptomic analyses, revealed that the addition of nano-hematite enhanced the process of Fe(III) reduction by upregulating genes associated with extracellular electron transfer (e.g., CYC, pliM ) and conductive biofilm formation (e.g., livH, secY, wza ). This synergistic Fe(III) reduction further facilitated intracellular carbon metabolism, energy production, and reductive dechlorination, as confirmed by the upregulated functional genes identified through transcriptomics and RT- q PCR. The discovery of the novel phenomenon involving synergistic Fe(III) reduction and dehalogenation broadens our understanding of the biochemical cycling of organohalides (e.g., chlorinated phenols) in iron-rich environment, and provides a feasible strategy for improving biodehalogenation through the regulation of carbon and electron flow at sites contaminated with organohalides.
研究领域:
环境微生物学
·
生物地球化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2016
·Vol. 39
·期 12
·2396-2405
·
IF 2.741
Mei-Lan Chen,Jian-Qing Min,Mei-Qiang Cai,Sheng-Dong Pan,Mi-Cong Jin
A new facile, rapid, inexpensive, and sensitive method for the analysis of six trace trichlorophenols in seawater samples was developed by magnetic micro-solid-phase extraction coupled to liquid chromatography with tandem mass spectrometry. Core–shell covalently functionalized ferroferric oxide coated with aminated silicon dioxide and decorated with multiwalled carbon nanotubes was applied as an adsorbent to perform the extraction process. The effect of factors including solution pH, contact time, adsorbent amount, and ionic strength were investigated in detail. The obtained results revealed that the proposed adsorbent was a highly effective and low-cost magnetic micro-solid-phase extraction material for the enrichment of 2,3,4-trichlorophenol, 2,3,5-trichlorophenol, 2,3,6-trichlorophenol, 2,4,5-trichlorophenol, 2,4,6-trichlorophenol, and 3,4,5-trichlorophenol from seawater. Under the optimized conditions, the recoveries ranged from 88.0 to 99.5% at the three spiking levels, the limits of detection and the limits of quantification were 0.002 and 0.007 μg/L for the six trichlorophenols, respectively. The intra- and interday relative standard deviations were 2.0–6.7 and 4.5–8.9%, respectively. The calibration curves showed a good linearity in the range of 0.02–5.0 μg/L. The routine run analyses showed that the developed method was fast, simple, accurate, solvent-saving and high resolution, and it was suitable for the determination of trace trichlorophenols in seawater.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Chao Zou,Mansi Wang,Yixin Chen,Yu Qin,Yun Zhao,Liang Qiao,Shasha Zhu,Tianming Chen,Ye Yuan
Bioelectrochemical systems with biocathodes constitute a promising means to enhance the biological dechlorination of 2,4,6-trichlorophenol (2,4,6-TCP) in constructed wetland (CW) sediments. However, the effect of different cathodic potentials on the structure and function of 2,4,6-TCP-reducing biocathode communities in CW sediments is largely unknown. Here, we evaluated the performance and microbial community structure of 2,4,6-TCP-reducing biocathode systems at different cathodic potentials (− 0.5, − 0.7, − 0.9, and − 1.1 V vs. saturated calomel electrode). The dechlorination efficiency of 2,4,6-TCP with the biocathode relatively increased by 16.02%–33.17% compared to that in the open circuit. The highest 2,4,6-TCP dechlorination efficiency (92.34 ± 0.86%) was observed at − 0.7 V in sediment, which may be due to the highest abundance of functional genera (e.g., Pseudomonas , Spirochaeta ) at − 0.7 V. Metagenomic analysis provided new insights into the metabolic potential of microorganisms in CW sediments and suggested possible 2,4,6-TCP conversion pathways in sediments. 2,4,6-TCP was gradually dechlorinated to form 4-chlorophenol, followed by a ring-opening step via the activities of chlorophenol reductive dehalogenase and oxygenase (e.g., cprA , tfdB ). Interestingly, micro-electrical stimulation enhanced the expression of chlorophenol reductive dehalogenase ( cprA ). Therefore, our findings at the molecular and gene expression levels provide insights into the effects of different cathodic potentials on the performance and community structure of 2,4,6-TCP-reducing biocathode systems in CW sediments.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Lu Yang,Xiaoying Jin,Zuliang Chen
Carbon-encapsulated nanoscale zero-valent-iron (C@Fe 0 ) derived from plant-based extracts has been the subject of growing interest due to its environmental friendliness. However, the effects of various pyrolysis atmospheres on the structure-function connections of C@Fe 0 are still unclear. In this study, three pyrolytic atmospheres, namely Air, N 2 , and 5% H 2 /Ar were selected to fabricate X-C@Fe 0 (X represented as A, N, H) for removing 2,4,6-Trichlorophenol (TCP), and the relationships between their structures and functions were demonstrated. The N-C@Fe 0 with improved hydrophobicity exhibited superior TCP adsorptive performance compared to H-C@Fe 0 and A-C@Fe 0 . Apart from this, N-C@Fe 0 effectively reduced TCP through dechlorination, this process achieved 25.9% dichlorination efficiency, and in turn alleviated products toxicity. Electrochemical tests and density functional theory calculations showed that the substitution of nitrogen with carbon in N-C@Fe 0 elevated the Fe- d band center and enhanced the hybridization between Fe-3 d and C-2 p orbital, which collectively promoted the dichlorination of TCP. This study will provide practical guideline for improving the intrinsic activity of iron-carbon materials using pyrolytic atmosphere engineering.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Wang Jingwen,Wan Ying,Yue Siyang,Ding Jiaqi,Xie Pengchao,Wang Zongping
UV/persulfate (UV/PS) could effectively degrade algal cells and micro-organic pollutants. This process was firstly applied to remove Microcystis aeruginosa (M. aeruginosa) and 2,4,6-trichlorophenol (TCP) simultaneously in bench scale. Algal cells can be efficiently removed after 120 min reaction accompanied with far quicker removal of the coexisted TCP, which could be totally removed within 5 min in the UV/PS process. Both SO4•- and HO• were responsible for algal cells and TCP degradation, while SO4•- and HO• separately dominated TCP degradation and algal cells removal. Apart from the role of radicals (SO4•- and HO•) for algal cells and TCP degradation, UV also played a role to some extent. Increased PS dose (0–4.5 mM) or UV intensity (2.71–7.82 mW/cm2) could enhance the performance of the UV/PS process in both TCP and algae removal. Although some intracellular organic matters can be released to the outside of algal cells due to the cell lysis, they can be further degraded by UV/PS process, which was inhibited by the presence of TCP. This study suggested the good potential of the UV/PS process in the simultaneous removal of algal cells and micro-organic pollutants.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Zishui Dong,Sinuo Li,Eldon R. Rene,Yixuan Liu,Weifang Ma
2,4,6-Trichlorophenol (2,4,6-TCP) is commonly used in the production of insecticides and preservatives with the characteristics of accumulation and toxicity due to the complex chemical structure with a halogenated aromatic ring. In order to effectively degrade and mineralize 2,4,6-TCP from water, a stack-coral-like catalyst of magnetic sulfur doping constructed nitrogen vacancies in graphitic carbon nitrides (Fe 3 O 4 /S-g-C 3 N 4 , FSCN-T) was designed and prepared through polymerization combined with precipitation. This visible-light-driven photocatalytic degradation to 5 mg/L 2,4,6-TCP was 95 % within 60 min with 0.1 g/L FSCN-T amendment. The degradation and carbonization rate constant were 0.118 and 0.089 min −1 respectively. This high removal was attributed to nitrogen vacancies, which broaden the visible light absorption range and shorten the electron transfer path with narrow CN bandgap (from 2.94 eV to 2.49 eV). Moreover, the introduction of iron accelerated electron cycling and enhanced magnetic recovery performance with above 95 % recovery and catalytic stability after 5 cycles of use. The degradation contribution from the active species were h + (41 %)> •OH (28.9 %) > •O 2 - (16.1 %)> 1 O 2 (8.7 %). This degradation underwent three pathways of substitution, elimination, and hydroxyl oxidation. Further, the intermediates were oxidized with ring opening and mineralization according to density functional theory (DFT) calculations and LC-Qtof-MS identification. The oxidative degradation process reduced the toxicity of 2,4,6-TCP and its intermediates. This study provided an efficient catalyst and low-energy consumption approach for toxic wastewater treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 10
·7483-7502
·
IF 3.442
Wu Minrong,Ma Yongwen,Wan Jinquan,Wang Yan,Guan Zeyu,Yan Zhicheng
The nZVI@mesoSiO 2 nanocomposites with ordered mesoporous structure were successfully prepared through a novel two-step method. Influences of the different conditions on the physicochemical properties and catalytic behavior were investigated. Degradation of 2,4,6-trichlorophenol (2,4,6-TCP) under different conditions was evaluated, and the possible activation mechanism was speculated. The results indicate that only the definite increase in the molar ratio of CTAB/NaOH (cetyltrimethylammonium bromide/sodium hydroxide) helps to obtain the higher specific surface area and narrower pore size distribution of the nZVI@mesoSiO 2 . The thickness of this silica coating could be easily regulated by changing the dosage of the TEOS (tetraethylorthosilicate) precursor. High dosage of the TEOS (larger than 5 mL) leads to the formation of core-free silica particles and low catalytic activity, while nZVI@mesoSiO 2 cannot fully develop at a low dosage (2.5 mL). By controlling different extraction conditions, the nanoscale zero-valent iron core (nZVI) in the composite can be well preserved and corrosion resistant in the whole synthesis process. In this case, the as-prepared nanocomposites offer a high surface area of 638.78 m 2 g −1 as well as a large accessible pore volume of 0.49 cm 3 g −1 for the degradation, which contributing to a fast and efficient degradation of 2,4,6-TCP from aqueous solutions at an appropriate pH (pH 5.0). Moreover, the reusability investigation indicated that the nZVI cores will be inactivated and the pore will be blocked after repeated cyclic reactions. This comprehensive information provides not only a great understanding of the regulation mechanism of core–shell mesoporous nanocomposites, but also a further useful modification of the composites with high selectivity for 2,4,6-TCP.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 6
·
IF 1.64
Qin Qu,Jianming Pan,Yijie Yin,Runrun Wu,Weidong Shi,Yongsheng Yan,Xiaohui Dai
Macroporous polymers foams (MPFs) were prepared by W/O Pickering high internal phase emulsions (HIPEs) stabilized by oleic acid (OA) modified silica nanoparticles (SPs), and then as-prepared MPFs were applied to highly efficient adsorption of 2,4,5-trichlorophenol (TCP). The characterization demonstrated that MPFs possessed macropore (50–150 μm) and interconnected pores (0.5–2 μm), and also had slightly hydrophobic nature (contact angle was 116°) and excellent thermal stability especially bellow 200°C. The influence of pH value, temperature, initial concentration, and contact time for the batch mode adsorption process was investigated, and the results showed that the maximum adsorption capacity and equilibrium time at 25°C were 167.7 mg g −1 and 30 min, respectively. Moreover, the experimental data indicate that equilibrium isotherms for TCP fitted to the non-linear Langmuir model, and both the adsorption and desorption kinetics can be represented by the pseudo-second-order model. The possible adsorption mechanism was considered to be the dispersion and hydrophobic interaction, simultaneously. The regeneration of the MPFs for one cycle was 94%. The results above strongly proved that this method reached the effect of highly efficient TCP removal. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41430.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）