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采用超声促进浸渍法制备了光助Fenton催化剂Fe/Al2O3,利用该催化剂对六氯苯(HCB)进行光助Fenton氧化降解,考察了浸渍液浓度、浸渍温度、灼烧温度和灼烧时间等制备条件对其催化降解六氯苯的活性的影响,确定了制备Fe/Al2O3的工艺条件,并对制得的催化剂进行表征。结果表明,超声促进浸渍法制备非均相光助Fenton反应催化剂Fe/Al2O3的最佳工艺条件为:浸渍液浓度25mmol/L,浸渍温度40℃,焙烧温度500℃,焙烧时间3h。在此条件下制备的催化剂对六氯苯的降解具有较高的催化活性。 相似文献
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JAE-HONG PARK IL-HYOUNG CHO SOON-WOONG CHANG 《Journal of environmental science and health. Part. B》2013,48(2):109-120
In this study, the photochemical degradation of livestock wastewater was carried out by the Fenton and Photo-Fenton processes. The effects of pH, reaction time, the molar ratio of Fe2 +/H2O2, and the Fe2 + dose were studied. The optimal conditions for the Fenton and Photo-Fenton processes were found to be at a pH of 4 and 5, an Fe2 + dose of 0.066 M and 0.01 M, a concentration of hydrogen peroxide of 0.2 M and 0.1 M, and a molar ratio (Fe2 +/H2O2) of 0.33 and 0.1, respectively. The optimal reaction times in the Fenton and Photo-Fenton processes were 60 min and 80 min, respectively. Under the optimal conditions of the Fenton and Photo-Fenton processes, the chemical oxygen demand (COD), color, and fecal coliform removal efficiencies were approximately 70–79, 70–85 and 96.0–99.4%, respectively. 相似文献
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Shunitz Tanaka Masayuki Kawai Yosuke Nakata Motoki Terashima Hideki Kuramitz Masami Fukushima 《毒物与环境化学》2013,95(4-6):95-102
The photo-Fenton reactions, which could yield hydroxyl radicals via the catalytic degradation of H2O2 by Fe(II), were focused as one of the abiotic degradation processes of bisphenol A (BPA) in surface waters. At pH 6, in the presence of H2O2 only, 32% of BPA was degraded after 120?min of irradiation. However, 97% of BPA was degraded in the presence of both H2O2 and Fe(II). Without light irradiation, no BPA degradation was observed even in the presence of Fe(II) and H2O2. These results show that photo-Fenton processes are effective in the natural attenuation of BPA in surface water. In addition, the presence of humic acids (HAs), which were of more aliphatic nature, resulted in enhancing BPA degradation via the photo-Fenton processes. Therefore, HAs can be one of the important factors in enhancing the degradation of BPA in surface water via the photo-Fenton processes. 相似文献
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Comparative study of the oxidation of atrazine and acetone by H2O2/UV, Fe(III)/UV, Fe(iii)/H2O2/UV and Fe(II) or Fe(III)/H2O2 总被引:1,自引:0,他引:1
In this study, the rates of degradation of organic compounds by several AOPs (H2O2/UV, Fe(III)/UV, Fe(III)/H2O2/UV, Fe(II)/H2O2 and Fe(III)/H2O2) have been compared. Experiments were carried out at pH ≈ 3 (perchloric acid / sodium perchlorate solutions) and with UV reactors equipped with a low-pressure mercury vapour lamp (emission at 253.7 run). The data obtained with atrazine ([Atrazine]o = 100 μg/L) showed that the rate of degradation of atrazine in very dilute aqueous solution is much more rapid with Fe(III)/UV than with H2O2/UV. Photo-Fenton process (Fe(III)/H2O2/UV) was found to be more efficient than H2O2/UV and Fe(II)/H2O2 for the mineralization of acetone ([Acetone]o = 1 mM). 相似文献
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Zhaoyue Sun Lisha Feng Guodong Fang Longgang Chu Dongmei Zhou Juan Gao 《环境科学学报(英文版)》2021,33(3):248-259
Nano-Fe2O3 embedded in montmorillonite particles (Fe-Mt) were prepared to degrade diethyl phthalate (DEP) with citric acid (CA) under xenon light irradiation. Compared to pristine montmorillonite (Na-Mt), the embedding process increased 14.5-fold of iron content and 1.8-fold of specific surface area. The synthesized Fe-Mt have more oxygen vacancies than Fe2O3 nanoparticles (nFe2O3), which could induce more reactive oxygen species (ROSs) generation in the presence of CA under xenon lamp irradiation. Fe-Mt with CA enhanced photo-assisted degradation of DEP 2.5 times as compared to nFe2O3 with CA. Quenching experiments, electron paramagnetic resonance (EPR) spectroscopy and identification of products confirmed that surface-bound ?OH was the main radical to degrade DEP. Common anions (i.e., NO3?, CO32?, Cl?) and humic acid could compete ?OH with DEP and cause slower degradation of DEP. The removal efficiency of DEP was more than 56% with Fe-Mt after three recycles, and the dissolved Fe concentration from Fe-Mt was below 75 μmol/L, indicating Fe-Mt had a good stability as a catalyst. Fe-Mt together with CA appeared to be a promising strategy to remove organic pollutants in surface water, or topsoil under solar irradiation. 相似文献
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I. Oller W. Gernjak M. I. Maldonado P. Fernández-Ibáñez J. Blanco J. A. Sánchez-Pérez S. Malato 《Environmental Chemistry Letters》2005,3(3):118-121
Titanium dioxide photocatalysis, using 200 mgl−1 of TiO2, and photo-Fenton, using 20 mg l−1 of iron, were applied to the treatment of dimethoate dissolved in water at 50 mg l−1. A heterogeneous photocatalysis test was performed in a 35-l solar pilot plant with Compound Parabolic Collectors (CPCs)
under natural illumination. A homogeneous photocatalysis test was performed in a different solar pilot plant with four CPC
units and a total volume of 75 l. In this work total disappearance of dimethoate and 90% of mineralization were attained in
both solar treatments. Treatment time, hydrogen peroxide consumption and ferric phosphate precipitation during photo-Fenton
treatment were discussed.
An erratum to this article can be found at 相似文献
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Shan Xue Shaobin Sun Weihua Qing Taobo Huang Wen Liu Changqing Liu Hong Yao Wen Zhang 《Frontiers of Environmental Science & Engineering》2021,15(5):95
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