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
FOOD CHEMISTRY
·
2022
·
IF 9.231
Changjian Li,Kexin Chi,Hang Yu,Yahui Guo,Weirong Ya,He Qian
Dissipation of an organophosphorus pesticide, trichlorfon, in natural and waxed apples during storage was studied. The results showed that the trichlorfon content in natural and waxed apples decreased by 85% and 64%, respectively, during storage. The morphology of the surface film was dense and regular, which resulted in a higher water vapor resistance and a lower respiration rate in the waxed apples. This indicates that waxing affected the dissipation of pesticide residues in the apple storage environment, increasing food safety risk. Ozone was used to remove the residual pesticides on the apple surface. The trichlorfon degradation rate reached 73%. The ozone treatment had no effect on the surface color of the apple, which means that the fruit can be pre-treated with ozone prior to waxing or storage.
研究领域:
食品安全
·
植物保护
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 15
·2998
·
IF 4.967
Zhou Wan,Chunlin Jiao,Qilin Feng,Jue Wang,Jianhua Xiong,Guoning Chen,Shuangfei Wang,Hongxiang Zhu
Intimate coupling photocatalysis and biodegradation treatment technology is an emerging technology in the treatment of refractory organic matter, and the carrier plays an important role in this technology. In this paper, sugarcane cellulose was used as the basic skeleton, absorbent cotton was used as a reinforcing agent, anhydrous sodium sulfate was used as a pore-forming agent to prepare a cellulose porous support with good photocatalytic performance, and nano-TiO2was loaded onto it by a low-temperature bonding method. The results showed that the optimal preparation conditions of cellulose carriers were: cellulose mass fraction 1.0%; absorbent cotton 0.6 g; and Na2SO460 g. The SEM, EDS and XPS characterization further indicated that the nano-TiO2was uniformly loaded onto the cellulose support. The degradation experiments of Rhodamine B showed that the nano-TiO2-loaded composite supports had good photocatalytic performance. The degradation rate of 1,2,4-trichlorobenzene was more than 92% after 6 cycles, and the experiment of adhering a large number of microorganisms on the carriers before and after the reaction showed that the cellulose-based carriers obtained the required photocatalytic performance and stability, which is a good cellulose porous carrier.Keywords:carrier;cellulose;degradation;photocatalysis;1,2,4-trichlorobenzene
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
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
·
材料科学
✓ 已验证
产品关联
DOI
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
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
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
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
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2022
·Vol. 16
·期 3
·424-430
·
IF 0.687
Wang Jue,Abdoulaye Maman Galandi,Jiang Zhongqin,Xiao Bing,Zhang Jiaming,Liang Yinna,Xiong Jianhua,Chen Guoning,Zhu Hongxiang,Zhao J. R.
With the increasing environmental pollution, it is urgently needed to develop efficient methods to remove recalcitrant organic pollutants. Herein, intimately coupled photocatalysis and biodegradation (ICPB) technology was fabricated using bagasse cellulose-TiO2 composite
(SBC-TiO2) as the carrier for photocatalyst and biofilm, Trichoderma mixed with activated sludge as a novel biological source for the removal of 1,2,3-Trichlorobenzene (1,2,3-TCB) and 1,3,5-Trichlorobenzene (1,3,5-TCB). The effects of different degradation conditions (carrier
dosage, pH of reaction solution, and light intensity) on the degradation efficiency were investigated separately. Under the optimal process conditions (carrier dosage of 5%, pH of the reaction solution was 5, and light intensity was 700 lm/m2), the removal rates of 1,2,3- and 1,3,5-TCB
reached 92.02% and 95.00% within 6 h, respectively. The degradation rate of TCB and the variation of microbial dehydrogenase activity (DHA) showed that the ICPB system exhibited good photocatalytic performance and biodegradation stability.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Songrui Li,Fubin Yang,Junying Li,Yongcun Zou,Qiong Jia
Background As a common organophosphorus pesticide, trichlorfon (TC) is being extensively used in agriculture due to its high efficiency in plant diseases and insect pest control. However, TC should be monitored in a timely manner due to its severe threat to public health. Currently reported fluorescence methods for TC detection largely depend on enzyme inhibition effect, which suffers from their intrinsic defects such as poor selectivity, complexity, or high cost. Hence, it is of essential value to develop a facile and low-cost fluorescence approach to achieve specific enzyme-free detection of TC. Results In this work, L-cysteine protected copper nanoclusters (CuNCs) with good stability were prepared as the fluorescence sensing probe. Under alkaline conditions, TC tends to be hydrolyzed to produce dichloroacetaldehyde, which was directly employed as an effective reducing agent to in-situ synthesize silver nanoparticles (AgNPs). The fluorescence of L-cys-CuNCs was quenched by AgNPs through the inner filter effect (IFE), realizing specific enzyme-free determination of TC. Besides, portable and visual detection of TC was achieved depending on a smartphone sensing platform. This method was further employed to monitor TC in cherry tomatoes, potatoes, and cultivated soil samples with satisfying results, illustrating its high potential in monitoring TC in real samples. Overall, this method possesses the attractive superiorities of simplicity, cost efficiency, and specificity for the detection of TC. Significance The strategy has the following advantages. (i) Specific enzyme-free detection of TC was achieved based on CuNCs/AgNPs fluorescent platform. (ii) AgNPs, as CuNCs fluorescence quencher, was directly in-situ synthesized using the hydrolysis products of TC, which avoids adding extra reducing agent and provides a possibility for the waste utilization of TC. (iii) A portable and low-cost smartphone sensing platform was constructed for visually specific determination of TC.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）