INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
·
IF 5.162
Yiming Zhou,Juanli Shen,Yong Bai,Te Li,Guoxin Xue
Carboxymethyl cellulose-based hydrogel coated Fe 3 O 4 magnetic nanoparticles were prepared using a coprecipitation combining graft copolymerization method, and characterized by various techniques to study their structure-property relationships. The nanocomposite was used as a heterogeneous Fenton-like catalyst for Acid Red 73 degradation. The effects of several key parameters, solution pH, H 2 O 2 concentration, catalyst dosage, and temperature of the reaction medium on the pseudo-first-order kinetics of dye degradation was evaluated. The results showed that the nanocomposite catalyst were highly effective in activating H 2 O 2 to produce reactive radicals for dye degradation, achieving complete decomposition under optimal conditions of 300 min at 25 °C and pH 3.5 with 100 mM H 2 O 2 and 200 mg·L −1 catalyst. The complexing hydrogel-Fe 2+ /Fe 3+ were the key factors that speed up the redox cycling between Fe 2+ and Fe 3+ species, thus accelerate the fast degradation rate of target pollutants. Scavenging experiments and electron paramagnetic resonance analyses revealed that Acid Red 73 was decomposed mainly by the attack of •OH radicals. Besides, reusability of the prepared nanocatalyst was also tested.
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
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 4
·E69
·
IF 3.12
Li Xu,Ye Wang,Qiutong Xu,Huiying Duan
Ti/SnO2-Sb-Fe electrodes have been prepared by a novel precipitation printing method, the traditional sol-gel method, and the direct current deposition method. The microstructure of the electrodes was systematically characterized through X-ray diffraction (XRD) observation and high-resolution transmission electron microscopy (HRTEM) verification. In addition, the morphology was characterized by scanning electron microscopy (SEM), while the electrochemical properties and the stability were further investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and accelerated life testing. The results indicate that the Ti/SnO2-Sb-Fe electrode prepared by precipitation printing has the smallest nanoparticle structure (< 10 nm), a higher electrochemical porosity (49.6%), and a higher oxygen evolution potential (2.20 V). As a comparison, the Ti/SnO2-Sb-Fe electrode prepared by the sol-gel method has the longest service life. To further evaluate the electrocatalytic activity of the Ti/SnO2-Sb-Fe electrodes, Acid Red 73 was employed as simulated sewage for electrochemical degradation. After 180 min, the removal efficiency of AR 73 reached 86.8%, 63.4%, and 74%, respectively, for Ti/SnO2-Sb-Fe electrodes prepared by precipitation printing method, traditional sol-gel method, and direct current deposition method. Furthermore, the degradation of AR 73 followed pseudo-first-order kinetics.
研究领域:
材料科学
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电化学工程
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Jiejie Wang,Yalei Ding,Shaoping Tong
The present study reported a novel Fe-Ag/GAC catalyst and investigated its catalytic activity for the degradation of Acid Red 73 by persulfate. The results of characterization of Fe-Ag/GAC showed that Nano-Ag was supported uniformly on GAC with high degree of crystallinity and Fe distributed mostly in the forms of noncrystalline FeO/Fe 3 O 4 or FeOOH. The presence of catalyst greatly enhanced the removal rate of AR 73, and it was found that 99% of decolorization efficiency and 84.1% of total organic carbon removal (TOC) of AR 73 could be obtained at the neutral pH within 60 min, respectively. The optimized experiments found that either higher temperature or higher dosage of Fe-Ag/GAC or Na 2 S 2 O 8 was favored for the degradation of Acid Red 73. Lowering solution pH could improve the degradation rate of AR 73. The recycling test indicated that the catalyst was relatively stable, showing a promising application.
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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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 14
·H1144
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IF 3.014
Li Xu,Yuefei Lian
A novel SnO2-Sb nanorods anode with Ti sheet as substrate (Ti/SnO2-Sb-NRs) was prepared through hydrothermal process. The Scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) and the contact angle meter were used to characterize the physicochemical properties of the anodes. Additionally, the electrochemical properties and the stability were further studied by the electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), cyclic voltammetry (CV), chronoamperometry (CA) measurements and accelerated life test, respectively. These results indicated that Ti/SnO2-Sb-NRs anode possessed SnO2-Sb-NRs which were about 70 nm in width, as well as a better wettability, a lower charge transfer resistance, a larger current at constant potential and a longer lifetime than the conventional Ti/SnO2-Sb anode prepared by pulse electro-deposition. And the existence of direct oxidation on Ti/SnO2-Sb-NRs anode was confirmed. Electrochemical degradation of Acid Red 73 (AR 73) was investigated to study the electro-catalytic oxidation performance of the anodes. And the results showed that SnO2-Sb-NRs remarkably improved the degradation of AR 73, the chemical oxygen demand (COD) removal efficiency and the adsorption capacity on Ti/SnO2-Sb-NRs anode, which was probably due to the synergetic effects of SnO2-Sb-NRs.
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
Journal of Water Process Engineering
·
2026
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IF 6.7
Bowen Ma,Shihao Zhang,Fada Feng,Zhen Liu,Keping Yan
The environmental pollution caused by textile dyeing wastewater has become increasingly severe. Ozone-venturi combined technology has attracted widespread attention in the field of wastewater treatment due to its high efficiency. This study systematically investigates the correlation between gas-liquid velocity and bubble size in the ozone-venturi system, and examines the effects of various factors—including gas velocity, liquid velocity, ozone dosage, initial pH, initial pollutant concentration, and reaction volume—on the degradation efficiency of Acid Red 73, aiming to validate the effectiveness of the ozone-venturi combined system in treating dyeing wastewater. Under optimized conditions, near-complete decolorization was achieved within 5 min for a 2.0 L solution of Acid Red 73 (gas velocity: 0.2 L/min, liquid velocity: 9 L/min, ozone dosage: 6.0 mg/L, initial concentration: 50 mg/L). The removal rates of COD and TOC reached 75.3% and 42.7%, respectively, after 10 min of degradation under optimal conditions. Furthermore, this study coupled ozone-venturi technology with persulfate oxidation, with the addition of 7 g of sodium persulfate, the degradation rate of Acid Red 73 was enhanced from 78.1% to 94.8% within 3 min. Possible degradation pathways of Acid Red 73 were proposed based on liquid chromatography-mass spectrometry (LC-MS) analysis and density functional theory (DFT) calculations.
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产品关联
DOI
高影响因子
BMC Chemistry
·
2023
·Vol. 17
·期 1
·1-14
·
IF 4.6
Wei Jia,Yan Luchun,Zhang Zhifang,Hu Bing,Gui Wenjun,Cui Yanjun
Acid red 73 is an azo dye, and its residue can pollute the environment and seriously threaten human health and life. In this study, glutaraldehyde was used as the crosslinking agent, chitosan and polyvinyl alcohol were crosslinked under appropriate conditions to obtain a chitosan hydrogel film, and carbon nanotubes were dispersed in the chitosan hydrogel film. The FTIR, XRD, BET, SEM were applied to chatacterize the structure and the morphology of the absorbent and results showed that when the mass fraction of the carbon nanotubes was 1%, the structure was a three-dimensional network with microporous, and the water absorption reached to the maximum value of 266.07% and the elongation at break reached to a maximum of 98.87%. The ability to remove acid red 73 from aqueous and soil environments was evaluated by UV. In the aqueous samples, 70 mg of the adsorbent reached a saturated adsorption capacity of 101.07 mg/g and a removal rate of 92.23% at pH = 5. The thermodynamics conformed with the Langmuir adsorption isotherm and pseudo second-order adsorption kinetic models. In the soil samples, 100 mg of the adsorbent reached an adsorption capacity of 24.73 mg/g and removal rate of 49.45%. When the pH of the soil is between 4 and 7, the removal rate and adsorption capacity do not change much; hence, the pH should be maintained between 5.2 and 6.8, which is extremely suitable for the growth of general plants. Moreover, the experimental results demonstrated that the adsorbent maintained a good removal rate of acid red 73 over six adsorption cycles. Graphical
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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水处理
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土壤修复
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高分子科学
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分析化学
✓ 已验证
DOI
高影响因子
OZONE-SCIENCE & ENGINEERING
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2025
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IF 1.4
Liping Shi,Liyuan Feng,Tianyang Wu,Yang Xiang,Jimmy Yun,Lei Shao
The presence of high concentrations of inorganic salts significantly challenges the treatment of dye wastewater. This study employed the high-gravity ozonation technology to degrade the Acid Red 73 (AR73) dye wastewater with high-salinity. A high-gravity device – a rotating packed bed (RPB), was used as the reactor for the treatment of the AR73 wastewater with ozone. The impact of inorganic salts, including K2HPO4, (NH4)2SO4, Na2CO3, NaHCO3, and Na2SO4 with concentrations up to 50 g/L, on the treatment effect of the wastewater in the RPB/O3 process was investigated. The liquid detention phenomena in the RPB were also explored to enhance the treatment of the AR73 wastewater. It was found that with the AR73 concentration of 300 mg/L and Na2SO4 concentration of 30 g/L in the wastewater, the optimal treatment effect was achieved at the detained liquid volume of 150 mL, with the ozone absorption, AR73 and COD removal rates reaching 75.7%, 91.3%, and 32.4%, respectively, representing increases of 103.5%, 34.9%, and 106.3% compared to those without liquid detention. The RPB/O3/liquid detention process provides an efficient method for the treatment of high-salinity dye wastewater.
研究领域:
环境工程
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化学工程
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水处理
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高级氧化技术
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产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Xiaoman Li,Longsheng Yi,Qinglin Zhu,Lihua Zhao,Yuanhong Xu,Miao Liu,Tao Liu,Qian Wu
In this study, coal fly ash supported MnO2 (CFA@MnO2) was synthesized as heterocatalyst for the activation of peroxymonosulfate to degrade Acid Red 73 (AR73). The synthesized catalyst was characterized by X-Ray Fluorescence Spectrometer (XRF), X-ray powder diffraction (XRD), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET). The composite of CFA@MnO2 possesses a large surface area of 74.59 m2/g. In the catalytic experiment, CFA@MnO2 exhibits excellent catalytic performance with 99.13% AR73 removed within 40 min with a high kinetic rate constant of 0.124 min−1, 5.49 times higher than that of pure MnO2. The operating parameters of CFA@MnO2-based fenton catalytic system were discussed, including MnO2 loading, solution pH, PMS dosage and temperature. The catalyst maintained a relatively high removal rate (>85%) over 5 cycles and degradation intermediates are detected on the catalyst surface after cycled via XPS analysis. The degradation mechanism was investigated by quenching experiments and Electron Paramagnetic Resonance technology. The surface-bound ·OH and SO4·− are considered as the main active radicals in the degradation process. The composite of CFA@MnO2 provides a low-cost and efficient alternative for the catalytic oxidation of organic pollutants.
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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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Yingzi Lin,Junjie Chen,Hao Li,Lei Chen,Baoling Yuan,Chunyan Shi,Siwen Li,Gen Liu,Yuefeng Xie
Acid red 73 (AR73) is a representative dye pollutant that poses a threat to the environment and human health. Effectively removing this type of pollutant by conventional processes is difficult. However, this study found that compared with UV/PDS, UV/O 3 , and PDS/O 3 , UV/O 3 /PDS composite system had the highest degradation effect on AR73. The degradation efficiency in the composite system reached 97.61% within 30 min, and the synergistic coefficients in the composite system were all greater than 1. In the UV/O 3 /PDS system, ·OH was the main free radical that mainly degrades AR73. The increase of PDS dosage promoted the degradation of AR73, but the increase of O 3 dosage was difficult to greatly improve the degradation of AR73 effect. The kinetic model of the apparent reaction rate was determined. The UV/O 3 /PDS system can efficiently degrade AR73 in a wide range of substrate concentrations and pH levels, and at the same time showed good adaptability to various concentrations of anions (Cl − , CO 3 2− , SO 3 2− , and C 2 O 4 2− ). Under raw water quality, the degradation effect of AR73 was still as high as approximately 90%. The theoretical attack site was obtained by DFT calculation , and the possible degradation pathway of AR73 was proposed based on the GC-MS spectrum and UV–Vis absorption spectrum . The attack of –N N- by ·OH, SO 4 − , and O 3 was proposed to be the main possible degradation pathway for AR73. Therefore, this study further improves the understanding of the UV/O 3 /PDS system and shows the potential applicability of this system in the treatment of dye wastewater.
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
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Qiutong Xu,Xiaoliang Song,Li Xu
A large effective surface area and a good electrical conductivity are very important characteristics for electrodes used in wastewater treatment. To improve them while lowering the cost, a novel MWCNTs-modified (Ti/ATONPs-MWCNTs) electrode was produced by a screen-printing technique. To test its performance, the electrode was compared to two other electrodes, namely, Ti/SnO2-Sb and Ti/ATONPs. Several important electrochemical measurements including impedance spectroscopy (EIS), cyclic voltammetry (CV), chronocoulometry (CC) and linear sweep voltammetry (LSV), were used in this study. A toxic organic dye (C.I. Acid Red 73) was chosen as the target pollutant to test the degradation by the removal of chroma and chemical oxygen demand (COD). Compared to Ti/SnO2-Sb and Ti/ATONPs, Ti/ATONPs-MWCNTs show the lowest charge transfer resistance (0.24 Ω), the largest effective surface area (61.97 cm2·cm-2) and the highest oxygen evolution potential (2.15 V). It is known that superior values of these performance characteristics are very important for improving the efficiency of wastewater decontamination. After 90 min electrolysis using Ti/ATONPs-MWCNTs, the removal of AR 73 reached 59.4%, while the energy consumption was as low as only 6.2 Wh·L-1. The remnant COD was only 45% after 3 h of degradation, with an instantaneous current efficiency (ICE) over 80% obtained for Ti/ATONPs-MWCNTs. These results demonstrate the promising prospects for the use of the novel Ti/ATONPs-MWCNTs electrodes in wastewater treatment processes.
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
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Cui Wang,Qiangqiang Yang,Zhenhong Li,Kun-Yi Andrew Lin,Shaoping Tong
A magnetic carbon-coated Fe-C/N composite was synthesized by a simple impregnation method and its performance in activating persulfate (PS) to degrade Acid Red 73 (AR 73) was investigated. The as-prepared carbon-coated Fe-C/N hybrid material was characterized via transmission electron microscopy , Raman spectra, X-ray diffraction and X-ray photoelectron spectrum. Degradation experiments showed that 98.11% of AR 73 could be degraded in 10 min, but its COD was partly removed. The effects of initial reaction pH and temperature were also evaluated. An increase of temperature was beneficial for the removal of AR 73, while the increase of pH had an opposite result. The activation energy of the AR 73 degradation was determined to be 46.12 KJ/mol, smaller than those in relative literatures. The recycling test showed that the carbon-coated Fe-C/N composite had good stability. The mechanism study indicated that the catalytic performance of Fe-C/N was due to the synergistic effect between Fe 3 C and Fe 3 N, and the N doped carbon shell suppressed the rate of Fe leaching, thus enhancing its stability.
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）