COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yu Lei,Yixing Hao,Hao Cheng,Jianfeng Ma,Yong Qin,Yong Kong,Sridhar Komarneni
Fe 2 O 3 @CeO 2 nanocomposites were synthesized by water bath heating method to activate NaHSO 3 for Orange II dye (50 mg L −1 ) degradation, which reached up to 98.2% within 120 min. The Fe 2 O 3 @CeO 2 and NaHSO 3 dosages and the molar ratios of Ce and Fe in Fe 2 O 3 @CeO 2 were investigated to obtain the optimum conditions as follows: 0.02 g Fe 2 O@CeO 2 , 0.1 g NaHSO 3 and the molar ratio of Ce and Fe was 5:2 (designated as Ce-Fe-1, or simply Fe 2 O 3 @CeO 2 ). In addition, Fe 2 O 3 @CeO 2 catalyst displayed superior catalytic performance to those materials that were previously reported, as verified by the good stability (reached 90.9% after three cycles) and high degradation rate of Orange II (98.2%) of the currently developed material. Existence of · SO 4 – and · OH radicals were verified by Electron Spin Resonance Spectroscopy during degradation, and these radicals are proposed to have high degradation efficiency of Orange II. On the basis of the detected radicals, a possible degradation mechanism was proposed to provide more choices for the application of sulfite in advanced oxidation processes (AOPs).
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Jun Chen,Layun Zhu,Shangqing Xia,Zhaoming Chen,Xue Li,Xiaohong Yang,Zihui Song,Yutong Wang,Zongsheng Zhan,Dongliang Shao
ABSTRACT The activated cyanobacterial carbon (ACC) prepared from Chaohu Lake cyanobacteria was used as a carrier for nitrogen doping to synthesize nitrogen-doped activated cyanobacterial carbon (N@ACC), a highly efficient activation material. N@ACC was found to be an effective catalyst for the degradation of Orange II (OII) dye by activating peroxymonosulfate (PMS). Characterization of N@ACC showed that it had a larger specific surface area (159.12 m 1 /g) than ACC and an average particle size of 3.28 nm. N@ACC also contained various functional groups such as C=O, C=N, and –OH. To optimize the degradation of OII, the reaction conditions of the N@ACC activated PMS system were adjusted. The N@ACC activated PMS system was able to achieve a degradation rate of 98.8% for OII (100 mg/L) within 35 min, which was significantly higher than the rate achieved by the ACC activated PMS system (19.5%). The degradation reaction followed first-order kinetics and indicated a combined free radical mechanism. Compared to ACC, N@ACC contained a higher content of nitrogen, specifically pyridinic and graphitic nitrogen. The results showed that introducing nitrogen would refactor the structure of raw carbon, regulate its properties, and create new active sites for the degradation of pollutants. Moreover, N@ACC does not need metallic elements to improve PMS degradation efficiency. Therefore, the synthesis of N@ACC could be used as a new way to activate PMS.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2015
·Vol. 91
·期 4
·985-993
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IF 2.349
Jiang Lu,Xiaodan Wei,Yu Chang,Shuanghong Tian,Ya Xiong
BACKGROUND An ozonation catalyst needs to be recycled easily and to exhibit high activity in view of its practical application in wastewater treatment. In this study, magnetic mesoporous MgFe 2 O 4 was successfully prepared and used as a new ozonation catalyst for degradation of Acid Orange II (AOII). The role of Mg in MgFe 2 O 4 was revealed to explain the high activity by catalytic experiments and XPS analysis. RESULTS The degradation efficiency of AOII in the MgFe 2 O 4 /O 3 process exceeds 90% over a wide pH range of 4.6–9.6, slightly affected by the solution pH. The catalytic activity of MgFe 2 O 4 is much higher than that of MgO, Fe 2 O 3 and also their mixture (MgO+Fe 2 O 3 ) with identical molar ratio of Mg 2+ to Fe 3+ , indicating the first role of Mg, i.e. coupling with Fe to present a synergistically catalytic effect. Furthermore, MgFe 2 O 4 possesses a reaction rate constant at least 2.3 times that of NiFe 2 O 4 , MnFe 2 O 4 , and CuFe 2 O 4 . It illustrates the second role of Mg, i.e. causing the high electron density on lattice oxygen in MgFe 2 O 4 indicated by XPS and thus favoring activation of the electrophilic ozone. CONCLUSIONS This study demonstrated the easy recycling and high activity of MgFe 2 O 4 in catalytic ozonation, and revealed the role of Mg in MgFe 2 O 4 . © 2015 Society of Chemical Industry
研究领域:
环境科学
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催化材料
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Mengyao Luo,Xue Sun,Tingting Jiao,Q. Guangzhou
A simple hydrothermal method was employed to synthesize BiVO 4 supported on reduced graphene oxide (BiVO 4 /RGO) composite photocatalyst to enhance photocatalytic activity of BiVO 4 for degradation of dye wastewater under visible light. The prepared photocatalysts were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, UV-Vis DRS and photocurrent measurements. The photocatalytic performances of the BiVO 4 /RGO composite were evaluated by degradation of Orange II (AO7) under visible light irradiation (λ > 420 nm). A series of experiments were carried out to evaluate the effects of various factors on removal efficiency of AO7. The results show that the BiVO 4 /RGO composite exhibited much higher photocatalytic activity than pure BiVO 4 . The highest removal efficiency of AO7 was obtained, and reach 100% after 150 min when the doping content, pH value, catalyst dosage was GB30 (30 mg of GO corresponds to 1 mmol of BiVO 4 ), pH = 9 and 200 mg, respectively. The free radical trapping experiments show that • O 2 - played the most important role in the degradation of AO7. The enhanced catalytic activity of the BiVO 4 /RGO composite can be attributed to the RGO. As an electron acceptor and transporter, RGO can effectively promote charge transfer in composite and inhibit the recombination of photo-induced electron-hole pairs.
研究领域:
材料科学
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环境化学
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光催化
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 14
·期 6
·956-966
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IF 3.552
Ni Qingzhuo,Cheng Hao,Ma Jianfeng,Kong Yong,Komarneni Sridhar
A ZnMn 2 O 4 catalyst has been synthesized via a sucrose-aided combustion method and characterized by various analytical techniques. It is composed of numerous nanoparticles (15–110 nm) assembled into a porous structure with a specific surface area (SSA) of 19.1 m 2 ·g −1 . Its catalytic activity has been investigated for the degradation of orange II dye using three different systems, i.e., the photocatalysis system with visible light, the chemocatalysis system with bisulfite, and the photochemical catalysis system with both visible light and bisulfite. The last system exhibits the maximum degradation efficiency of 90%, much higher than the photocatalysis system (15%) and the chemocatalysis system (67%). The recycling experiments indicate that the ZnMn 2 O 4 catalyst has high stability and reusability and is thus a green and eximious catalyst. Furthermore, the potential degradation mechanisms applicable to the three systems are discussed with relevant theoretical analysis and scavenging experiments for radicals. The active species such as Mn(III), O 2 •− , h + , e aq − , SO 4 •− and HO • are proposed to be responsible for the excellent degradation results in the photo-chemical catalysis system with the ZnMn 2 O 4 catalyst.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Fang Zhu,Jianfeng Ma,Qiuyue Ji,Hao Cheng,Sridhar Komarneni
A special catalytic system was obtained by using ZnMn 2 O 4 (ZMO) materials to activate Na 2 S 2 O 8 and catalytically degrade organic dye orange II under visible light irradiation. The ZMO nanoparticles were prepared by a simple one-step method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS). In this study, the ZMO/Na 2 S 2 O 8 system was used to degrade orange II, and the degradation rate reached 97.44% in 60 min. ZMO catalysts could be recycled for at least five times, and its degradation rate was only decreased by 1.84%. The free radicals produced during the degradation of orange II were studied by classical quenching experiments, and the different types of free radicals produced in the system were further confirmed by electron paramagnetic resonance (EPR) spectroscopy. The catalytic degradation of orange II in this system was mainly caused by the production of superoxide , sulfate and hydroxyl radicals, which achieved high degradation.
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
PLASMA SCIENCE & TECHNOLOGY
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2019
·Vol. 22
·期 3
·034009
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IF 1.193
Weigang CHEN,Haixia WU,Jiawei FAN,Zhi FANG,Shaohua LIN
In this study, the effect of activated peroxydisulfate (PDS) by dielectric barrier discharge (DBD) plasma and activated carbon (HGAC) on the removal of acid orange II (AOII) was investigated. The effects of applied voltage, PDS dosage, HGAC dosage, initial pH value, and inorganic anions on the removal rate of AOII were discussed. The main free radicals degrading azo dyes during the experiment were also studied. Experimental results show that the removal rate of AOII in DBD/HGAC/PDS synergistic system is much higher than that in the single system. With the applied voltage of 16 kV, HGAC dosage of 1 g l−1, PDS and AOII molar ratio of 200:1, initial pH value of 5.4 and concentration of AOII solution of 20 mg l−1, the removal rate of AOII reached 97.6% in DBD/HGAC/PDS process after 28 min of reaction. Acidic and neutral conditions are beneficial for AOII removal. Sulfate and hydroxyl radicals play an important role in the removal of AOII. Inorganic anions are not conducive to the removal of AOII.
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
CELLULOSE
·
2019
·Vol. 26
·期 5
·3285-3297
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IF 3.917
Gao Hejun,Du Jia,Liao Yunwen
Abstract A novel biological magnetic adsorbent was successfully constituted with sugarcane bagasse (SCB), polyetherimide (PEI) and Fe 3 O 4 . The physicochemical properties of the adsorbent (Fe 3 O 4 @PEI/SCB) were investigated by SEM, BET, VSM, XRD, TGA, FT-IR, XPS, TEM and UV–Vis. The adsorption capacity was measured using Cr(VI) and orange II as adsorbates. The effects of initial pH, dosage, contact time, and ionic strength on the adsorption capacity were investigated in detail. Fe 3 O 4 @PEI/SCB is a mesoporous material and the mass ratio of Fe 3 O 4 :PEI:SCB is about 5:2:15. Adsorption capacity could reach 182.28 mg/g and 1893.57 mg/g for Cr(VI) and orange II at room temperature, respectively. Fe 3 O 4 @PEI/SCB is a green and economical material, which is very easily regenerated, reused, and separated in the adsorption. The most important factor is the ionic strength and major adsorption interaction was electrostatic in this work. Graphical abstract
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2024
·
IF 4
Zhaopeng Wang,Hui Lv,Yu Zhang,Yanan Li
Acid orange II (AO2) is a synthetic azo dye commonly used illegally in food production and processing. The development of a fast and effective analytical method is crucial for controlling the unlawful use of AO2 in food, especially in seasoning. Here, an antibody specific for AO2 was generated, with 1.01 ng/mL IC 50 and minimal cross-reactivity with other analogs (<1 %, including sunset yellow , tartrazine , para red, chromotrope FB, Sudan Ⅰ, rhodamine B , 2-naphthol, amaranth , ponceau 4 R and allura red AC). Furthermore, a highly sensitive quantum dot beads-based fluorescence immunochromatography assay (QBs-FICA) was established for AO2 determination. The assay had a working range of 23–287 μg/kg with a 11 μg/kg limit of detection (LOD) in chili powder and hotpot seasoning samples. Using spiked samples, the results of QBs-FICA were found to be consistent with those of liquid chromatography-tandem mass spectrometry. This indicates that QBs-FICA is a reliable, rapid, and portable tool for testing of AO2.
研究领域:
食品安全检测
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分析化学
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生物技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
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2017
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IF 5.715
Lingjun Kong,Minhua Su,Yan Peng,Li'an Hou,Juan Liu,Haipeng Li,Zenghui Diao,Kaimin Shih,Ya Xiong,Diyun Chen
Because of the widespread application of activated carbon (AC) as adsorbents, reduced production costs are highly desirable, therefore, inexpensive alternatives for activated carbon precursors and eco-procedures are presently sought. In this work, AC was successfully prepared from sawdust through co-calcinations with limestone. The surface area and porosity of the resulting ACs were evaluated according to the N 2 adsorption at 77 K. Acid Orange II (AOII) was utilized as a negative dye to study the potential of the resulting AC as an adsorbent. Results revealed that the surface area and total pore volume were both increased greatly. When the activated carbon was prepared in mass ratios of 1:2 and 1:1 (calcium carbonate to sawdust), the surface area increased to 611.4 and 706.9 m 2 /g, respectively, and the adsorption capacities increased to 310.89 and 389 mg/g. These enhancements indicated efficient activation, resulting in energy-saving and environmentally friendly activated carbon production. Thus, this paper provides a cleaner process for producing activated carbon from waste sawdust through bioresource recycling.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 6
·期 7
·2296-2304
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IF 5.426
Kaixin Zhu,Junhu Wang,Yanjie Wang,Changzi Jin,Ayyakannu Sundaram Ganeshraja
Refractory and non-biodegradable pollutants produced by industries have inevitably brought great threat to human life. Integrating several kinds of advanced oxidation processes (AOPs) into one system has been proposed to be an efficient strategy to remove such pollutants from the environment at low cost. In this study, magnetic zinc ferrite fine nanoparticles, firstly synthesized by a novel soft chemical solution process, showed super reactivity, good reusability and easy separation ability for visible-light-induced Orange II degradation in an integrated ZnFe2O4/PMS (peroxymonosulfate, 2KHSO5·KHSO4·K2SO4, OXONE) aqueous system. Powder X-ray diffraction, transmission electron microscopy, and 57Fe Mössbauer and X-ray photoelectron spectroscopy were employed to characterize the structure and morphology as well as recognize the physicochemical changes of the fine nanoparticles before and after the reaction. The generated oxidizing intermediates during the degradation process were detected by electron paramagnetic resonance spectroscopy and classic quenching experiments, which confirmed that both sulfate radical (SO4˙−) and hydroxyl radical (˙OH) co-existed in the degradation process. The systematic condition experiments further verified the dual functionality of the ZnFe2O4/PMS system, which actively acted as a photocatalyst and a PMS activator for dye molecule oxidation under visible light irradiation. This study proves that photocatalysis and PMS activation for remediation of organic pollutants in water can be easily integrated into one system by using zinc ferrite nanoparticles as an environmentally friendly catalyst.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Fang Zhu,Huiqi Wu,He Zhang,Sridhar Komarneni,Jianfeng Ma
Here in, a special catalytic system of potassium persulfate (K 2 S 2 O 8 , PS) activated by Bi 2 MoO 6 –CuS composite was established for the orange II (OII) degradation under visible light. The Bi 2 MoO 6 –CuS composite was synthesized by a two-step hydrothermal and solvothermal methods. The structure, morphology, light absorption and photocatalytic properties of the composite were respectively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–visible diffuse reflectance spectroscopy (UV–vis DRS). The removal efficiency of OII degradation in the Bi 2 MoO 6 –CuS/PS/vis system reached to 98% within 80 min, which was much higher than that of either Bi 2 MoO 6 or CuS alone. A feasible mechanism analysis of OII degradation was proposed and validated by simple classical quenching experiments and electron spin resonance (ESR) spectroscopy. The high removal efficiency by the nanocomposite could be attributed to highly active species of O 2 ·- , ·OH and SO 4 •− radicals in the Bi 2 MoO 6 –CuS photocatalytic oxidation system. Moreover, the composite material retained its activation performance even after 5 degradation cycles, which suggested its high stability.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）