JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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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
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Chen-Yan Hu,Ye-Ye Zhu,Bin Xu,Tian-Yang Zhang,Yi-Li Lin,Cun Xiong,Qiang-Bing Wang,Dan-Dan Huang,Ling Xu
This study explored the degradation of an iodine X-ray contrast media , iohexol, under heterogeneous ozone-catalyzed oxidation by adding Fe 3 O 4 and 1-hydroxybenzotriazole (HBT). Results show that increasing the dosages of Fe 3 O 4 catalyst and ozone as well as solution pH were beneficial to the degradation of iohexol. The presence of low background humic acid (HA) concentration (≤10 mg/L) promoted iohexol degradation, but high HA concentration (≥20 mg/L) inhibited it. Adding HBT exhibited a similar effect on iohexol degradation as HA. The degradation rate constant of iohexol was calculated as 0.07108 min −1 in the Fe 3 O 4 /O 3 /HBT process ([HBT] = 5 μM) at pH 7.0, which was approximately 1.5 times higher than that in the Fe 3 O 4 /O 3 process (0.04533 min −1 ), and 4 times higher than that in the O 3 process (0.01742 min −1 ). Fe 3 O 4 /O 3 /HBT process was pH-dependent with high degradation efficiency of iohexol at pH 5 or 7. Singlet oxygen ( 1 O 2 ), hydroxyl radical ( OH ∙ ), and superoxide radical ( O 2 - ∙ ) have been identified in the Fe 3 O 4 /O 3 /HBT process, and the conversion of Fe 2+ to Fe 3+ was more obvious on the surface of Fe 3 O 4 compared to that in the Fe 3 O 4 /O 3 process. Transformation intermediates were identified, and the degradation pathways of iohexol were proposed. Overall, Fe 3 O 4 /O 3 could enhance iohexol degradation compared with ozone-only system, and adding trace HBT in Fe 3 O 4 /O 3 system can further enhance heterogeneous ozone-catalyzed process for rapid organic matter degradation.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Weirui Chen,Yixiang Bao,Xukai Li,Jun Huang,Jinxin Xie,Laisheng Li
Heterogeneous catalytic ozonation had met the bottlenecks when treating low concentration but high toxic pollutants: (i) the low mass transfer efficiency of ozone and pollutants to hydrophilic catalyst; (ii) the negative impact of coexisted water matrixes. Herein, to enhance the mass transfer efficiency of reactants toward hydrophilic Fe-MCM-41 as well as enhance the interfacial reaction, the fluoride planting Fe-MCM-41 (F-Fe-MCM-41) was synthesized and employed as catalyst in catalytic ozonation for nitrobenzene (NB). Both NB and TOC removal were promoted in F-Fe-MCM-41/O 3 with 99.0 % NB removal in 60 min and 88.6 % TOC removal in 120 min, which were superior to the degradation efficiency by O 3 and Fe-MCM-41/O 3 . FTIR, EPR, Mössbauer spectra, 29 Si NMR, 19 F NMR et al verified that the replacement of non-reactive silanols (-Si−OH) of Fe-MCM-41 with Si F groups could enhance its hydrophobicity, Lewis acidity and mass transfer effect. Comparative characterizations, experiments and theoretical calculations verified that interfacial reaction played the major role over liquid phase reaction for NB degradation in F-Fe-MCM-41/O 3 . Moreover, the strengthened interfacial reaction also reduced the OH scavenging effect of water matrix, such as humic acid and carbonate. The interfacial adjustment method proposed in this study provided a novel insight into catalyst design and water treatment process.
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
VACUUM
·
2022
·
IF 4.11
Xiaoxian Zhang,Bin Zhou,Shujuan Yin,Yishan Wang,Xueqian Zhang,Qingduo Meng,Fanpeng Meng,Chuncheng Wei,Guangwu Wen
In the present study, mesoporous manganese dioxide catalysts with large high specific surface area, pore volume and large pore size structure were synthesised using the nano-casting method with a mesoporous structure of silica SBA-15 as a hard template. Therefore, the physical and chemical properties of mesoporous MnO 2 were characterised by XRD , FT-IR, Raman, UV–Vis, N 2 adsorption-desorption, SEM, EDS , TEM, TG and XPS. In this study, the oxidative reactivity of MnO 2 corresponding to methyl orange (MO) and oxalic acid (OA) was assessed. MnO 2 was found to contain the most abundant oxygen vacancies and easily reducible surface adsorbed oxygen (O latt ), which facilitates the catalytic utilisation of ozone. As a result, the highest catalytic performance was achieved for methyl orange and oxalic acid, with degradation efficiencies of 98.37% and 92.96%. This present study deepens our understanding of manganese dioxide catalyzed ozone and provides a reference for improving process efficiency.
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
JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Zhuoyan He,Dehua Xia,Yajing Huang,Xiuqin Tan,Chun He,Lingling Hu,Huanjunwa He,Jiawei Zeng,Wenjun Xu,Dong Shu
A heterogeneous catalytic ozonation/membrane filtration (HCOMF) system was fabricated by integrating a flat-plate polyvinylidene fluoride (PVDF) membrane module along with a slurry catalytic ozonation reactor. The performance and catalytic activity of HCOMF was evaluated for degradation of model wastewater containing bisphenol A (BPA) and humid acid (HA) under different permeation flux in long-term continuous experiments. The membrane fouling was investigated by trans-membranous pressure (TMP), membrane filtration resistance, scanning electronic microscopy (SEM), and fluorescence spectra. The results showed that HCOMF system exhibited an excellent and stable catalytic activity in long-term continuous experiments owning to integration of 3D MnO 2 hollow microsphere ozone-catalysis with flat-plate membrane filtration. The TMP of HCOMF system didn’t increase significantly, and the membrane resistance R p and R c declined from 4% and 16% to 1% and 4%, respectively, thus, the membrane fouling of HCOMF system was mitigated compared to MF system. The mitigation of membrane fouling in HCOMF system was attributed to the increase of hydrophilicity of membrane surface and change of HA fractions.
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
Frontiers in Energy Research
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2022
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IF 3.858
Zhang Shuai,Ren Huixue,Fu Kaifang,Cheng Wenqing,Wu Daoji,Luo Congwei,Jiang Shengyun,Li Jie,Zhang Mingyue
The printing and dyeing wastewater produced by different dyes, as well as different printing and dyeing processes, have different components. These wastewater have high toxicity, high organic concentration, and deep chromaticity. Ozone catalytic oxidation is a very promising technical method for wastewater treatment. In this paper, Mn/Mg/Ce ternary catalyst was prepared, and the ozone catalytic oxidation treatment of actual and simulated printing and dyeing wastewater was performed to study the performance of four different carrier catalysts, namely, molecular sieve (MS), silica gel (SG), attapulgite (ATP), and nano alumina (Al2O3), by simulated dynamic test. The effects of reaction time, pH, and catalyst dosage on methyl orange degradation were studied. The results showed that under the optimum treatment conditions (120 min, pH 11, and 12.5 g/L catalyst dosage), the degradation rate of methyl orange reached 96% and the removal rate of the chemical oxygen demand of printing and dyeing wastewater reached 48.7%. This study shows that the treatment effect of ozone catalytic oxidation on printing and dyeing wastewater is remarkably improved after catalyst addition. This study provides a new choice of ozone catalyst for the degradation of printing and dyeing wastewaters in the future.
研究领域:
环境科学
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废水处理技术
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
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IF 11.4
Boge Zhang,Yongjie Shen,Biyuan Liu,Jian Ji,Wenjing Dai,Pingli Huang,Dengsong Zhang,Guangqin Li,Ruijie Xie,Haibao Huang
Ozone catalytic oxidation (OZCO) has gained great interest in environmental remediation while it still faces a big challenge during the deep degradation of refractory volatile organic compounds (VOCs) at room temperature. Hydroxylation of the catalytic surface provides a new strategy for regulating the catalytic activity to boost VOC degradation. Herein, OZCO of toluene at room temperature over hydroxyl-mediated MnOx/Al2O3 catalysts was originally demonstrated. Specifically, a novel hydroxyl-mediated MnOx/Al2O3 catalyst was developed via the in situ AlOOH reconstruction method and used for toluene OZCO. The toluene degradation performance of MnOx/Al2O3 was significantly superior to those of most of the state-of-the-art catalysts, and 100% toluene was removed with an excellent mineralization rate (82.3%) and catalytic stability during OZCO. ESR and in situ DRIFTs results demonstrated that surface hydroxyl groups (HGs) greatly improved the reactive oxygen species generation, thus dramatically accelerating the benzene ring breakage and deep mineralization. Furthermore, HGs provided anchoring sites for uniformly dispersing MnOx and greatly enhanced toluene adsorption and ozone activation. This work paves a way for deep decomposition of aromatic VOCs at room temperature.
研究领域:
环境科学
·
催化
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化学工程
·
大气化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）