Degradation of Acid Blue 74 using Fe-ZSM5 zeolite as a heterogeneous photo-Fenton catalyst
Degradation of Acid Blue 74 using Fe-ZSM5 zeolite as a heterogeneous photo-Fenton catalyst
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DOI：
10.1016/j.apcatb.2008.02.024
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发表时间：
2008-10-25
影响因子：
22.1
通讯作者：
Aleboyeh, A.
中科院分区：
文献类型：
--
作者：
Kasiri, M. B.;Aleboyeh, H.;Aleboyeh, A.
靛蓝染料C.I.的脱色和矿化。在UV-C光和H_2O_2存在下，以Fe-ZSM-5沸石为催化剂，对酸性蓝74进行了光催化降解。不同的参数，如催化剂的量，染料和H2 O2的初始浓度和染料溶液的初始pH值的降解效率的过程进行了评估。结果表明，在2L间歇式光反应器中，当pH值为5时，使用21.4mmol l（-1）的H_2O_2和0.5g l（-1）的催化剂，120 min后可去除含8.56 × 10 ~（-5）mol l（-1）酸性蓝74的溶液中约57%的总有机碳。浸出试验表明，催化剂的活性不是由于浸出的铁离子，虽然在水溶液中发现约0.3毫克/升（-1）铁离子的量。UV/Fe-ZSM_5/H_2O_2体系与均相Fenton型体系相比，处理后溶液中Fe ~（2+）和Fe ~（3+）的浓度显著降低，具有很大的优势。发现通过使用该催化剂，可以扩大能够发生芬顿型氧化的pH值范围，并且不形成氢氧化铁淤渣。还观察到，催化行为可以在连续实验中重现，而不会显著降低工艺效率。(c)2008 Elsevier B. V.保留所有权利。
Decolourisation and mineralization of an indigoid dye, C.I. Acid Blue 74, was conducted using Fe-ZSM5 zeolite as a catalyst in the presence of UV-C light and H2O2. The effects of different parameters such as amounts of catalyst, initial concentration of the dye and H2O2 and initial pH of the dye solution on the degradation efficiency of the process were assessed. The results indicated that by using 21.4 mmol l(-1) of H2O2 and 0.5 g l(-1) of the catalyst at pH 5, about 57% total organic carbon of a solution containing 8.56 x 10(-5) mol l(-1) Acid Blue 74 could be removed after 120 min in a 2 l batch photo-reactor. Leaching tests indicated that the activity of the catalyst is not due to leached iron ions, although an amount of about 0.3 mg l(-1) iron ions was found in the aqueous solution. Significantly lower concentration of Fe2+ and Fe3+ in the solution after the treatment could give a great advantage to UV/Fe-ZSM5/H2O2 system over the homogeneous Fenton-type system. It was found that by using this catalyst, it is possible to expand the range of pH values for which Fenton-type oxidation can occur and no iron hydroxide sludge is formed. It was also observed that catalytic behaviour could be reproduced in consecutive experiments without a considerable drop in the process efficiency. (c) 2008 Elsevier B.V. All rights reserved.