CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Xiaoyu Yang,Xuanxuan Lei,Shaokun Tang
A simple hydrothermal method is utilized to fabricate hierarchically olive-like γ -Al 2 O 3 using ionic liquid [Bmim]BF 4 as the structure directing agent . The olive-like γ -Al 2 O 3 presents uniform morphology with the average diameter of 500 nm and rich mesopores. As template, ionic liquid [Bmim]BF 4 plays a crucial role in the controllable morphology of the product. [Bmim]BF 4 is absorbed on the AlOOH nanoparticles surface via the H-bond interaction and induces crystalline oriented growth. Then the forming AlOOH nanosheets self-assemble into olive-like hierarchical structure through π–π stack interaction. Given that the structure advantage of the olive-like γ-Al 2 O 3 and the limited study concerning cerium-based catalysts in Fenton-like reaction, nano-CeO 2 / γ -Al 2 O 3 supported catalyst is prepared and used in Fenton-like degradation for the first time. The result suggests that the olive-like γ -Al 2 O 3 support not only reduces the surface energy with more uniform CeO 2 (ca. 4–5 nm) dispersion but also improve the concentration of Ce 3+ active sites. The CeO 2 / γ -Al 2 O 3 catalyst displays superior catalytic activity for the degradation of Orange II (AO7) compared with pure CeO 2 nanoparticles.
研究领域:
材料科学
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环境科学
·
催化化学
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DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Yingying Sun,Wan Li,Liqing Zhao,Fengyong Li,Yunfei Xie,Weirong Yao,Wenqiu Liu,Zhaosheng Lin
In food safety assessment, surface-enhanced Raman spectroscopy (SERS) is a novel detection method with the advantages of being fast, easy, and of high sensitivity. However, many SERS substrate synthesis methods are complex, and there are only a few studies on the simultaneous detection of multiple substances. In this study, a new, simple, low-cost SERS substrate was synthesised for the first time to simultaneously detect illegal food additives rhodamine B and basic orange II in chilli products. A lightweight, porous, and low-cost material of melamine foam (MF) was employed as the SERS synthesis template. The substrate’s SERS effect on, and sensitivity to, rhodamine B and basic orange II were demonstrated. The molecular vibration and SERS enhancement mechanisms of the two target molecules were analysed by density functional theory (DFT) calculations. The results reveal that this fabricated substrate has great application potential for the supervision and testing industry.
研究领域:
食品安全
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分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Xiaoyu Yu,Jianliang Sun,Guibiao Li,Yi Huang,Yu Li,Dehua Xia,Feng Jiang
The sulfate radical (•SO 4 − )-based advanced oxidation processes (AOPs) for the degradation of refractory organic pollutants consume a large amount of persulfate activators and often generate toxic organic by-products. In this study, we proposed a novel iron-cycling process integrating •SO 4 − -based AOP mediated by reusable iron particles and a sulfidogenic process to degrade and detoxify Orange II completely. The rusted waste iron particles (Fe 0 @Fe x O y ), which contained Fe II /Fe III oxides (Fe x O y ) on the shell and zero-valent iron (Fe 0 ) in the core, efficiently activated persulfate to produce •SO 4 − and hydroxyl radicals (•OH) to degrade over 95% of Orange II within 120 min. Both •SO 4 − and •OH destructed Orange II through a sequence of electron transfer , electrophilic addition and hydrogen abstraction reactions to generate several organic by-products (e.g., aromatic amines and phenol), which were more toxic than the untreated Orange II. The AOP-generated organic by-products were further mineralized and detoxified in a sulfidogenic bioreactor with sewage treatment together. In a 170-d trial, the organic carbon removal efficiency was up to 90%. The inhibition of the bioreactor effluents on the growth of Chlorella pyrenoidosa became negligible, due to the complete degradation and mineralization of toxic AOP-generated by-products by aromatic-degrading bacteria (e.g., Clostridium and Dechloromonas ) and other bacteria. The sulfidogenic process also well recovered the used Fe 0 @Fe x O y particles through the reduction of surface Fe III back into Fe II by hydrogen sulfide formed and iron-reducing bacteria (e.g., Sulfurospirillum and Paracoccus ). The regenerated Fe 0 @Fe x O y particles had more reactive surface Fe II sites and exhibited much better reactivity in activating persulfate in at least 20 reuse cycles. The findings demonstrate that the integrated process is a promising solution to the remediation of toxic and refractory organic pollutants because it reduces the chemical cost of persulfate activation and also completely detoxifies the toxic by-products.
研究领域:
环境科学
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污染治理
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微生物学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jing Wei,Zhigang Zheng,Lin Zhao,Zhaoguo Qiu,Dechang Zeng
A method involving the application of an elevated proton conductive shell onto Fe-base amorphous alloys (Fe am ) through the mechanical ball-milling process with oxalic acid dihydrate (OA-BFe am ) is presented. The investigation highlights that the resulting Fe 2 C 2 O 4 ·shell remarkably enhances the removal rate of acid orange II (AO II) by Fe am , exhibiting an approximately 2.17-fold increase. This enhancement is attributed to the superior proton conductivity of the Fe 2 C 2 O 4 shell in comparison to the iron oxide shell. Consequently, protons can effectively traverse the Fe 2 C 2 O 4 shell and permeate into the iron core, where they serve as reducing agents to generate H. Simultaneously, the formation of surface-adsorbed Fe 2+ occurs rapidly, contributing to a highly efficient AO II removal process across a broad pH range. Additionally, it is noteworthy that OA-BFe am exhibits equivalent efficacy in the removal of both direct and reactive dyes. Overall, this work introduces an environmentally benign surface modification technique for Fe am and underscores the influence of proton conductivity on the dye wastewater removal capability of Fe am .
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2015
·Vol. 23
·期 2
·301-310
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IF 1.108
Ye Wei,Zhao Binxia,Gao Han,Huang Jiajun,Zhang Xiaoli
Fe,Zn,Al-pillared montmorillonite (Mt) were prepared by ion exchange reaction. Effect of the Fe/Zn molar ratio in Fe,Zn,Al-pillaring solution on the structural properties of Fe,Zn,Al-Mt was examined. Characterization studies were performed by N 2 -adsorption/desorption, ICP, FTIR, DR UV–Vis spectroscopy and XRD. The interlayer space, specific surface and volume of micropores of pillared-Mt was 18.8 Å, 157 m 2 g −1 and 0.114 cm 3 g −1 respectively. Besides, the catalytic performance of Fe,Zn,Al-Mt was analyzed through wet peroxide oxidation of Orange II under mild experimental condition. The results indicated that the catalytic performance of Fe,Zn,Al-Mt was affected by the Fe/Zn molar ratio as following pattern: the obtained pillared solids with lower Fe/Zn molar ratios exhibited better catalytic performance and less iron leaching during the reaction. Moreover, the introduction of zinc into Mt shortened the induction time of reaction and improved the catalytic behaviour. Throughout this work, the chemical oxygen demand removal of OII was 77.1 % after the solution treated by Fe,Zn,Al(3/7)-Mt (defined as the Fe/Zn molar ratio of 3/7 in the pillaring solution) catalyst at temperature of 60 °C and atmospheric pressure of 1 atm.
研究领域:
环境化学
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催化材料
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废水处理
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无机非金属材料
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表面科学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Dongao Xie,Changxin Tang,Dan Li,Jiren Yuan,Feigao Xu
FeOCl has attracted much attention for its good photo-Fenton properties. However, there are still some limitations to the removal efficiency of organic pollutants. Visible-light-responsive FeOCl/CdS quantum dot composites were prepared by calcination to overcome their flaws, and their catalytic activity was explored by the degradation of acid orange II (AO-II). The experimental results showed that the FeOCl/CdS composites exhibited better catalytic performance than pure components. The F1Cd0.5 composite (mass ratio of FeOCl to CdS is 1:0.5) achieved 98.5% removal efficiency of AO-II, which is 14.8 times higher than that of FeOCl+CdS under similar experimental conditions; moreover, the F1Cd0.5 composite still exhibits a high stability after five cycles. According to the characterization and experimental results with density functional theory calculations together, it is proposed that the type II carrier transfer-separation mechanism plays a leading role in enhancing the photodegradation performance of the photo-Fenton catalysts. This study provides a new idea to further improve the catalytic efficiency of the photo-Fenton technology for organic pollutant degradation.
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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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2017
·
IF 3.671
Tianyi Zhu,Wei Huang,Lingfan Zhang,Jie Gao,Wenqing Zhang
In this work, cerium immobilized cross-linked chitosan (CTS-Ce) composite, employed as an efficient adsorbent for Cr(VI) in single system and coexisted with Orange II (OII) in binary system, was prepared by co-precipitation method. The as-obtained adsorbent was characterized by FTIR, SEM, EDS and XPS before and after adsorption. The adsorption behaviors of Cr(VI) in single and binary system were systematically studied. The maximum adsorption capacity of Cr(VI) on CTS-Ce (202.8 mg/g) was calculated by Langmuir equation in single metal system, but it decreased to 112.9 mg/g with initial concentration of 100 mg/L OII in binary system at pH 2 and 293 K. The adsorption data for Cr(VI) followed the Langmuir model in single system, while fitted Temkin model well in binary system. In both single and binary system, the kinetics of adsorption exhibited pseudo-second order behavior and adsorption capacity increased with increasing temperature. Moreover, the data of thermodynamic parameters ( ΔG° < 0, ΔH° > 0) indicated that the adsorption was a spontaneous and endothermic process. Besides, | Δ G C r | > | Δ G C r − O I I | at the same temperature further suggested that Cr(VI) was adsorbed on the CTS-Ce composite faster in binary system than in single system.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2017
·Vol. 92
·期 8
·2038-2049
·
IF 3.135
Yanqun Song,Chuan Rong,Jiaobo Shang,Yinghui Wang,Yuanyuan Zhang,Kefu Yu
BACKGROUND The heterogeneous photo-Fenton-like process is emerging as a promising treatment of dye-containing wastewater because of its economic feasibility and high efficiency. However, it is still required to develop photo-Fenton-like catalysts with highly selective degradation ability and reusability. RESULTS Inorganic-framework molecularly imprinted Fe-doped TiO 2 composites (MIP/Fe–TiO 2 ) were successfully prepared by the sol–gel method, with acid orange II as the template and TiO 2 as the matrix material. The photo-Fenton-like catalysts were characterized using FESEM, EDS, BET, X-ray diffraction, FT-IR spectroscopy and UV–vis diffuse reflectance spectroscopy. These methods revealed the well-crystallized anatase phase and good nanometer-level particle sizes. The adsorption property and photo-Fenton-like activity of the catalysts were also studied in single and binary systems, respectively. CONCLUSIONS Compared with non-imprinted Fe–TiO 2 composites (NIP/Fe–TiO 2 ), MIP/Fe–TiO 2 showed higher adsorption capacity and selectivity toward the template molecule. In addition, it was found that the molecular recognition ability of MIP/Fe–TiO 2 provided the catalysts with rapidly selective photo-Fenton-like degradation of low target pollutant levels (20 mg L −1 ) in the presence of high levels of interferential pollutant sodium dodecyl benzene sulfonate (100 mg L −1 ). Moreover, because of the stable physicochemical properties of the inorganic framework, the new photo-Fenton-like catalysts were resistant to photochemical attack and showed favorable reusability. © 2017 Society of Chemical Industry
研究领域:
环境科学
·
材料科学
·
化学工程
·
催化
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DOI
高影响因子
FOOD CHEMISTRY
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2020
·
IF 6.306
Leilei Wu,Hongbin Pu,Lunjie Huang,Da-Wen Sun
Synthetic dyes have been widely applied to food processing, but abuse of colourants in food may pose risks to human health. To analyze new coccine (NC) and orange II (OII) in food, a versatile surface-enhanced Raman scattering (SERS) platform was proposed. A metal-organic framework (MOF, UiO-66(NH 2 )) with octahedral crystal structure was synthesized and gold nanoparticles were grown on the MOF surface to fabricate UiO-66(NH 2 )@Au versatile SERS platform. The UiO-66(NH 2 )@Au displayed much better SERS performance than gold nanoparticles with high R 2 of 0.9684 for NC and 0.9912 for OII and low LOD of 0.4015 mg/L for NC and 0.0546 mg/L for OII. The recoveries of NC and OII in Mirinda soft drink and paprika ranged from 82.92 to 109.63%. This study provided a sensitive and rapid method for determination of NC and OII through UiO-66(NH 2 )@Au, and the proposed SERS platform revealed great potential for analyzing synthetic colourants in food samples.
研究领域:
分析化学
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食品科学
·
纳米技术
·
光谱学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Zhenping Liu,Haiyun Zhai,Zuanguang Chen,Qing Zhou,Zhixian Liang,Zihao Su
A novel Fe 2 O 3 nano-materials/oxygen functionalized multi-walled carbon nanotubes/triton X-100 modified carbon paste electrode (Fe 2 O 3 /MWCNTs-COOH/OP/CPE) was prepared to simultaneously detect orange G (Or G) and orange II (Or II) by electrochemical methods. Compared with the bare carbon paste electrode (CPE), Fe 2 O 3 /MWCNTs-COOH/OP/CPE exhibited obvious electrocatalytic activities towards Or G and Or II. Furthermore, the two azo dyes were identified and separated successfully, and were simultaneously determined by the redox peaks in cyclic voltammograms (CVs) and differential pulse voltammogram (DPV) under optimum conditions. In DPV, anodic peak current (Ipa) and concentrations were linearly related well for 0.1-20.0 μM Or G and 0.2-50.0 μM Or II. The limits of detection (S/N = 3) of Or G and Or II were 0.05 μM and 0.1 μM, respectively. Therefore, the electrode is suitable for the determination of Or G and Or II in industrial wastewater due to high sensitivity and selectivity, low detection limit, good reproducibility, as well as easy preparation and regeneration.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 8
·3934-3940
·
IF 2.936
Chunyong Zhang,Wei Chen,Jiahui Xian,Degang Fu
In this work, a novel definitive screening design (DSD) was initially used to investigate the in situ chemical oxidation of acid orange-II (AO II) dye using a homogeneous cobalt-catalyzed peroxymonosulfate (Co2+/PMS) system. Experiments were performed in a batch reactor using a synthetic AO II solution containing cobalt ions, humic acid (HA) and five electrolyte salts (NaCl, NaNO3, NaHCO3, Na2SO4 and NaH2PO4). The effects of nine operating variables on AO II degradation: NaCl concentration (0–20 mM), NaH2PO4 concentration (0–20 mM), NaHCO3 concentration (0–20 mM), NaNO3 concentration (0–20 mM), Na2SO4 concentration (0–20 mM), HA concentration (0–40 mg L−1), PMS concentration (2–10 mM), AO II concentration (0–100 mg dm−3) and Co2+ concentration (0–1.36 mM), were investigated. Analysis of a DSD model revealed that only four variables were statistically significant. Besides, our results indicated that there were no significant interactive effects between the five anions employed. Thereafter, a central composite rotatable design (CCRD) was adopted to further optimize these significant variables. A CCRD model describing AO II conversion as a function of PMS concentration, NaCl concentration and Co2+ concentration was then constructed and used to explore the final optimal operating conditions. As a consequence, the combination of DSD and CCRD allowed reducing the number of experiments from over 600 to only 39. Lastly, a plausible reaction sequence concerning the oxidation of AO II in the Co2+/PMS/Cl− system was also proposed. The route of AO II oxidation involved hydroxylation and chlorination, signifying the roles of both sulfate radicals and active chlorine species.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 83
·期 2
·257-270
·
IF 1.638
Qu Guangzhou,Wang Hui,Li Xin,Wang Tiecheng,Zhang Zengqiang,Liang Dongli,Qiang Hong
This paper presents a study of V and N co-doping TiO 2 embedding multi-walled carbon nanotubes (MWCNTs) supported on γ -Al 2 O 3 pellet (V/N-TiO 2 -MWCNTs/ γ -Al 2 O 3 ) composite photocatalyst induced by pulsed discharge plasma to enhance the removal of acid orange II (AO7) from aqueous solution. The photocatalytic activity of the V/N-TiO 2 -MWCNTs/ γ -Al 2 O 3 composite to AO7 removal induced by the pulsed discharge plasma was evaluated. The results indicate that the V/N-TiO 2 -MWCNTs/ γ -Al 2 O 3 composite possesses enhanced photocatalytic activity that facilitates the removal of AO7 compared with the TiO 2 -MWCNTs/ γ -Al 2 O 3 and TiO 2 / γ -Al 2 O 3 composites. Almost 100% of AO7 is removed after 10 min under optimal conditions. The V 0.10 /N 0.05 -TiO 2 -MWCNTs/ γ -Al 2 O 3 photocatalyst exhibits the best removal effect for AO7. Analysis of the removal mechanism indicates that the enhancement of the removal of AO7 resulting from V and N co-doping causes TiO 2 lattice distortion and introduces a new impurity energy level, which not only reduces the band gap of TiO 2 but also inhibits the recombination of the pairs. An efficient and easily recycled V/N-MWCNTs-TiO 2 / γ-Al 2 O 3 composite was prepared. Activity of the composite induced by discharge plasma to AO7 removal was evaluated. Synergistic effect of discharge plasma and catalyst effectively improve AO7 removal. The composite demonstrates adequate recycling performance in a discharge plasma system. Possible mechanisms of AO7 removal were analyzed.
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DOI
高影响因子
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