RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 1
·23-42
·
IF 3.134
Lin Yingzi,Hou Ao,Li Hao,Shi Chunyan,Chen Lei,Yuan Baoling,Liu Yi,Wang Yu,Liu Xiaochen
Dye wastewater with high concentration, large molecular weight, complex structure, and certain toxicity has brought a serious burden to the environment. In this study, acid red 73 dye (AR73) was used as the model pollutant to compare the degradation effects of different systems on AR73. The influence factors of a UV/hydrogen peroxide/peroxydisulfate (UV/H 2 O 2 /PDS) composite system, such as H 2 O 2 dosage, initial concentration of AR73, initial pH value, anion concentration, and actual water, on the degradation of AR73 were investigated. Compared with other systems, the UV/H 2 O 2 /PDS composite system had the best degradation effect of AR73, with a degradation efficiency of 98.98%, which conforms to the pseudo-first-order reaction kinetic model, the pseudo-first-order reaction kinetic constant ( k obs ) is 0.1339 min −1 . And the synergy coefficients in this complex system were all greater than 2. Specifically, the degradation efficiency of the UV/H 2 O 2 /PDS composite system for AR73 was the highest when the initial pH was neutral. The presence of anions inhibited the degradation of AR73, and the real water reduced the degradation efficiency for AR73. Electron spin resonance (ESR) detection and free radicals capture test demonstrated that hydroxyl radical ( · OH) was the main reactive species in AR73 degradation, and its 80.66–84.93% contribution. With the destruction of the structure of AR73 by free radicals, anilines, phenols, and oxalic acid were found to be the main intermediate products during the degradation of AR73 by gas-phase mass spectrometry and UV–vis spectrograms. The changes in toxicity during the degradation of AR73 by the UV/H 2 O 2 /PDS complex system were also assessed.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jianing Xiu,Ziyong Ow,Yuning Zhao,Xiaohui Bai
Urban rivers or water bodies play an important role in improving the ecological environment. However, many of them are turbid and uncomfortable. In this study, five species of microalgae were isolated from different natural water and used to find their growth potential, flocculation ability, turbidity and nutrient removal ability and the flocculation mechanisms were investigated. The results showed that, three microalgae species, namely, Ankistrodesmus sp. WZ3A4, Coelastrella tenuitheca W6D5, Chlorella sorokiniana W6A3 can efficiently reduce the turbidity in natural water. Optical microscope and SEM observations revealed that they can attach the suspended particles to form flocs and display high turbidity-removal efficiencies (TRE) of 74.7 %, 82.6 %, 93.8 % respectively in natural turbid water. Chlorella sorokiniana W6A3 can even reduce the turbidity from 60.3 NTU to 3.73 NTU. Through EPS component analysis, TRE changes and surface characteristics before and after EPS extraction, Fourier transform infrared (FTIR) spectrum analysis, we found that the high turbidity-removal efficiency of these microalgae species was not closely related to charge neutralization, but greatly associated with the tightly bound EPS and the high relative hydrophobicity. Hydrophobic interaction and the adhesion of extracellular macromolecular polysaccharides have important effects on the flocculation of microalgae in natural turbid water. FTIR showed that microalgae with higher turbidity-removal efficiencies all had stronger stretching vibration near 1135 cm −1 . This study demonstrates that light-driven self-flocculating microalgae can clarify natural turbid water while converting atmospheric carbon dioxide into living biomass through light energy and proposes a novel and carbon-negative technology for restoring urban turbid water environments.
研究领域:
环境科学
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微生物学
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水处理
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生物技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Xiaoyuan Zhang,Qing Qin,Xuetong Zhai,Hongliang Guo,Song Han,Jo-Shu Chang,Duu-Jong Lee
Background Energy-efficient remediation technology for black and odorous water bodies in cold and salty areas is in high demand. This study experimentally investigated the performance of a novel integrated process at lab and pilot scales, in both batch and continuous-flow modes, to treat black and odorous lake water from Daqing City, China. Methods In 25-liter batch tests, relevant influence conditions were optimized. The 756-liter batch tests confirmed these results. Meanwhile, a continuous flow experiment was added to improve the removal rate of pollutants further. Significant findings In 25-liter batch tests maximum removal rates for COD, NH 4 + -N, TP, and TN were 78.6 %, 72.3 %, 79.1 %, and 76.3 %, respectively, using reed plants and carbon fiber grass with L 2 bacteria under optimal conditions (two cfb per floating-island unit, pH 8, DO of 4 mg/L, 25–30 °C, microbial enhancer of 0.75 g/flu). The 756-liter batch tests confirmed these results, achieving improved removal rates of 80.4 %, 75.1 %, 75.5 %, and 78.4 % over 30 days. Continuous-flow tests yielded maximum removal rates of 85.2 %, 89.5 %, 87.4 %, and 90.1 % at an 8-hour HRT, demonstrating superior performance under short retention times. The study revealed interactions with the key biological processes during remediation. The proposed costs for this method indicate high feasibility for field applications.
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Xiaojuan Zhang,Ting Dong,Linhao Wang,Tianhua Yang,Yanlong Li,Wanli Zhang
With high microporosity, good dispersibility, excellent specific surface area and large content surface functional group, hydrochar demonstrates significant advantages and strong affinity towards pollutants in water. Modification method plays a significant role for anion adsorption by modified hydrochar, layered double hydroxide (LDH) modified hydrocarbons (Mg/Al-LDH@HC-HCl) have been synthesized through a one-step hydrothermal approach and activated with hydrochloric acid in this paper. The physical and chemical characteristics of the hydrochar, both before and after modification, are analyzed using BET, SEM-EDS, TEM, XRD, FTIR, and XPS to explore the phosphate adsorption mechanisms. The adsorption behavior of the composite follows the pseudo-second-order kinetic model and the Langmuir isotherm model, achieving a substantial adsorption capacity of 143.03 mg/g. Multiple mechanisms are leveraged within the absorption process, including pore filling, electrostatic attraction, ligand exchange, metal complexation on inner and outer surfaces, and ion exchange. An approximate 70% phosphate removal efficiency is retained by modified Mg/Al-LDH@HC-HCl after a comprehensive 5-cycle desorption using NaOH as the eluent, demonstrating the remarkable regenerability of synthesized hydrochar composite.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Jing Deng,Yongjian Ge,Chaoqun Tan,Hongyu Wang,Qingsong Li,Shiqing Zhou,Kejia Zhang
Nanoscale α-MnO 2 with different morphologies (nanoparticles, nanoflowers and nanorods) were synthesized via a facile hydrothermal method and tested in peroxymonosulfate (PMS) activation for ciprofloxacin (CIP) degradation. The catalytic activity of α-MnO 2 mainly relied on the specific surface area and crystallinity, and followed the order of α-MnO 2 nanoflowers > α-MnO 2 nanorods > α-MnO 2 nanoparticles > commercial MnO 2 . Acidic condition was more beneficial to CIP removal than neutral condition, and the degradation would be greatly accelerated in alkaline circumstance. The introduction of chloride and bicarbonate displayed concentration-dependent dual effect. The presence of natural organic matter (NOM) exerted the detrimental effect on CIP degradation. Eleven oxidation products were identified by UPLC–MS/MS and the changes of their concentrations were monitored, five products showed monotonous uptrend while four intermediates present monotonous downtrend once they were generated. Piperazine ring cleavage, hydroxylation and F/OH substitution were found to be the important oxidation pathways. The acute toxicity of resulted solution gradually decreased with the lapse of time, and higher PMS concentration favored the detoxification. The CIP removal in α-MnO 2 /PMS process was also efficient under the actual water background, which was testified by the results of fluorescence excitation-emission matrix (EEM).
研究领域:
环境科学
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化学
✓ 已验证
DOI
高影响因子
TALANTA
·
2019
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IF 4.916
Wenqiang Jing,Yanying Zhou,Jiaqin Wang,Yuanfeng Zhu,Youqi Lv,Wentao Bi,David Da Yong Chen
A sorbent and solvent co-enhanced direct analysis in real-time mass spectrometry (SSE-DART-MS) method was developed for high-throughput determination of trace pollutants in water. The use of sorbent for preconcentration and solvents for assisting desorption and ionization synergistically enhanced the signals from the trace pollutants detected by DART-MS. Phthalic acid esters (PAEs) were used as model analytes to validate the SSE-DART-MS method. Graphitic carbon nitride (g–C 3 N 4 )–based materials with two morphologies and six organic solvents were used to systematically evaluate the enhancement effect by the sorbent and solvent. A better analytical performance was achieved with the two-dimensional (2D) g-C 3 N 4, compared to three-dimensional (3D) g-C 3 N 4 /C, indicating that the morphologies of sorbents played a key role in SSE-DART-MS analysis. The MS signals of all the analytes were increased by 10–100 times for the two materials in the presence of the selected solvents. With the SSE-DART-MS method, concentration limits of detection for water samples in the range 0.07–0.94 ng L −1 , and recovery in the range 82.8–119% using g-C 3 N 4 , were obtained for the PAEs. This work not only provides a reliable method for the coupling of solid phase extraction technique with DART-MS, but also presents valuable information for conducting other DART-MS analyses.
研究领域:
环境科学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 23
·e2403544121
·
IF 9.4
Jing-Hang Wu,Tian-Hao Yang,Yi-Jiao Sun,Yuan Min,Yi Hu,Fei Chen,Jie-Jie Chen,Han-Qing Yu
Peracetic acid (PAA) is emerging as a versatile agent for generating long-lived and selectively oxidative organic radicals (R–O•). Currently, the conventional transition metal–based activation strategies still suffer from metal ion leaching, undesirable by-products formation, and uncontrolled reactive species production. To address these challenges, we present a method employing BiOI with a unique electron structure as a PAA activator, thereby predominantly generating CH3C(O)O• radicals. The specificity of CH3C(O)O• generation ensured the superior performance of the BiOI/PAA system across a wide pH range (2.0 to 11.0), even in the presence of complex interfering substances such as humic acids, chloride ions, bicarbonate ions, and real-world water matrices. Unlike conventional catalytic oxidative methods, the BiOI/PAA system degrades sulfonamides without producing any toxic by-products. Our findings demonstrate the advantages of CH3C(O)O• in water decontamination and pave the way for the development of eco-friendly water decontaminations based on organic peroxides.
研究领域:
环境科学
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化学
✓ 已验证
DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
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2020
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IF 5.88
Zhong-Hui Wang,Yun-Fei Zhang,Xiao-Wen Sun,Ying-Jie Li,You-Ming Zhang,Tai-Bao Wei,Hong Yao,Qi Lin
Paraquat, one of non-selective herbicides, is widely used in agricultural production. However, it can cause death of people or animals quickly owing to its fatal toxicity. In the present work, for efficient separation and removal of the paraquat, a concept “employ collaboration effect to enhance the Host-Guest interactions” was rationally introduced into the design of paraquat adsorbent material. According to this concept, a novel linear tri-pillar[5]arene-based acceptor molecule was synthesized. Interestingly, the acceptor shows outstanding adsorption properties for paraquat through the collaboration effect of the adjacent pillar[5]arene moieties in the linear tri-pillar[5]arene acceptor. Compared with other adsorbents such as activated carbon and single-pillar[5]arene-based adsorbent materials, the linear tri-pillar[5]arene acceptor shows higher adsorption rate for paraquat. Additionally, the linear tri-pillar[5]arene acceptor was applied to adsorb the commercial pesticide paraquat sample in water with adsorption rate of 98%. Therefore, the linear tri-pillar[5]arene acceptor could serve as a paraquat adsorbent material and convey greatly potential application in the field of removal of paraquat. The concept “employ collaboration effect to enhance the Host-Guest interactions” is a useful way for the development of adsorption materials.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Ting Wang,Tianwei Qian,Dongye Zhao,Xiaona Liu,Qingwei Ding
Radioactive pertechnetate (TcO4 − ) has been detected in nuclear waste affected soil and groundwater, posing significant effect on human health and the environment. Yet, cost-effective remediation of Tc-contaminated soil and groundwater remains challenging. To address this critical technology need, we prepared a class of pyrite (FeS 2 ) particles for effective immobilization of pertechnetate. Using perrhenate (ReO 4 − ) as a non-radioactive surrogate of TcO 4 − , we tested the immobilization effectiveness of the material through batch kinetic experiments, and evaluated the remobilization potential of immobilized Re under anoxic (sealed from air) and oxic (exposed to air) conditions and in the presence of humic acid (HA), EDTA, nitrate, and a Chinese loess soil. The results showed that more acidic pH gave faster Re(VII) removal due to more abundant electron sources (Fe 2+ and S 2 2− ). X-ray diffraction (XRD) and/or X-ray photoelectron spectroscopy (XPS) analyses confirmed formation of ReO 2 /ReS 2 as the major reduction products. The immobilized Re remained highly stable when aged for 360 days under anoxic conditions at different influence factors. Yet, the immobilized Re was vulnerable to oxygen oxidation, and about 78% of Re was remobilized after 40 days of exposure to air regardless of the initial pH (3.5–9.0) due to excessive pyrite oxidation and the associated pH drop (~2). HA at 120 mg/L inhibited Re remobilization under oxic conditions, which lowered the Re remobilization by ~21% after 40 days of oxic aging. The presence of EDTA facilitated dissolution of Fe but inhibited the dissolution of Re under oxic conditions. Nitrate showed negligible effect on Re remobilization. The presence of a Chinese loess soil effectively inhibited Re remobilization under both oxic and anoxic conditions, lowering the leachable Re by ~32% under oxic conditions. The findings may guide engineered application of pyrite particles as a long-lasting reducing material for immobilization pertechnetate or similar redox-active contaminants in soil and water.
研究领域:
环境科学
·
放射性废物处理
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
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2018
·
IF 6.042
Yi-Tao Zou,Zhou Fang,Yuan Li,Runmei Wang,Hao Zhang,Kevin C. Jones,Xin-Yi Cui,Xin-Yao Shi,Daixia Yin,Chao Li,Zhao-Dong Liu,Lena Q. Ma,Jun Luo
Widespread use of organophosphorus flame retardants (OPFRs) and their ubiquity in water results in the need for a robust and reliable monitoring technique to better understand their fate and environmental impact. In situ passive sampling using the diffusive gradients in thin-films (DGT) technique provides time-integrated data and is developed for measuring OPFRs here. Ultrasonic extraction of binding gels in methanol provided reliable recoveries for all tested OPFRs. Diffusion coefficients of TCEP, TCPP, TDCPP, TPrP, TBP, and TBEP in the agarose diffusive gel (25 °C) were obtained. The capacity of an HLB binding gel for OPFRs was >115 μg per disc, and the binding performance did not deteriorate with time up to 131 days. DGT performance is independent of typical environmental ranges of pH (3.12–9.71), ionic strength (0.1–500 mmol L–1), and dissolved organic matter (0–20 mg L–1), and also of diffusive layer thickness (0.64–2.14 mm) and deployment time (3–168 h). Negligible competition effects between OPFRs was found. DGT-measured concentrations of OPFRs in a wastewater treatment plant (WWTP) effluent (12–16 days) were comparable to those obtained by grab sampling, further verifying DGT’s reliability for measuring OPFRs in waters.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Analytical Methods in Chemistry
·
2014
·
IF 0.948
Hongzhi Hu,Ying Liang,Shuo Li,Qing Guo,Chancui Wu
In the existence of appropriate amount of disodium ethylenediaminetetraacetate (EDTA), precipitation would not occur in seawater and other natural waters even if the sample solution was adjusted to strong basicity, and the NH3-OPA-sulfite reaction at the optimal pH range could be used to determine ammonium in natural waters. Based on this, a modified o-phthalaldehyde fluorometric analytical method has been established to determine ultratrace ammonium in natural waters. Experimental parameters, including reagent concentration, pH, reaction time, and effect of EDTA, were optimized throughout the experiments based on univariate experimental design. The results showed that the optimal pH range was between 10.80 and 11.70. EDTA did not obviously affect the fluorometric intensity. The linearity range of the proposed method was 0.032–0.500 µmol/L, 0.250–3.00 µmol/L, and 1.00–20.0 µmol/L at the excitation/emission slit of 3 nm/5 nm, 3 nm/3 nm, and 1.5 nm/1.5 nm, respectively. The method detection limit was 0.0099 µmol/L. Compared to the classical OPA method, the proposed method had the advantage of being more sensitive and could quantify ultratrace ammonium without enrichment.
研究领域:
环境科学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Yinan Bu,Liwei Wang,Baiyang Chen,Ruilan Niu,Yi Chen
This study investigated a range of typical water components and parameters, including pH, carbonate, bicarbonate, halides , nitrate, dissolved organic matter (DOM), free chlorine, and initial concentration, on the photodegradation kinetics of seven different haloacetic acids (HAAs) with different halogen substitutions. The results show that the photolysis rates can generally be enhanced by additions of free chlorine and iodide yet decelerated by increases of DOM and bromide. In contrast, pH and feeding HAA concentration did not affect the photodegradation of HAAs significantly over pH ranges from 6 to 11 or doses from 0.05 to 50 mg/L. One exception existed that hydroxide, bicarbonate, and carbonate apparently inhibited the photolysis kinetics of monochloroacetic acid, suggesting that indirect photolysis via hydroxyl radical was partially responsible for this compound. As for the combined influences of water matrix, the photolysis rates of HAAs dosed into tap, lake, and ocean waters were lower than those dosed into ultrapure water by on average 21–38%, indicating that most components in these real waters tended to suppress the photolysis. The study therefore demonstrates the complexity of DBP removal using a UV system, and such results may help assessment of the real potential of UV photolysis for HAA control in water.
研究领域:
环境科学
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化学工程
✓ 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）