Catalytic ozonation of dimethyl phthalate over cerium supported on activated carbon
Catalytic ozonation of dimethyl phthalate over cerium supported on activated carbon
复制标题
活性炭负载铈催化邻苯二甲酸二甲酯臭氧化
DOI：
10.1016/j.jhazmat.2009.04.081
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发表时间：
2009-10-15
影响因子：
13.6
通讯作者：
Li, Xukai
中科院分区：
文献类型：
--
作者：
Li, Laisheng;Ye, Weiying;Li, Xukai
采用浸渍法制备的铈负载活性炭（Ce/AC）降解水中邻苯二甲酸二甲酯（DMP）。活性炭中存在的矿物质对其增强DMP臭氧化过程的活性有积极的作用。较高的浸渍Ce(NO3)(3)浓度和煅烧工艺增加了其微孔体积和比表面积，减小了其外表面面积。在活性炭表面沉积0.2% （w/w）的铈时，催化活性达到最佳。采用XRD、SEM和BET对Ce/AC催化剂进行了表征。活性炭或Ce/AC催化剂的存在大大改善了它们在臭氧化DMP中的降解和矿化。在Ce/AC催化剂作用下，30 mg/L DMP（初始pH 5.0）以50 mg/h臭氧流速氧化60 min， TOC去除率达到68%，活性炭为催化剂时去除率达到48%，单独臭氧氧化时去除率仅为22%。叔丁醇（一种众所周知的(OH)- o中心点自由基清除剂）的存在强烈地抑制了活性炭或Ce/AC催化臭氧氧化对DMP的降解。TOC去除率符合二级动力学模型。在臭氧流量为50 mg/h的情况下，Ce/AC催化剂对DMP进行臭氧氧化，其矿化速率常数比活性炭高2.5倍，比03单独高7.5倍。Ce/AC催化剂在臭氧化DMP过程中连续反应780 min，表现出较好的催化活性和稳定性。Ce/AC催化剂是一种很有前景的臭氧化水中有机污染物催化剂。(C) 2009 Elsevier B.V.版权所有
Cerium supported on activated carbon (Ce/AC), which was prepared by dipping method, was employed to degrade dimethyl phthalate (DMP) in water. The mineral matter present in the activated carbon positively contributes to its activity to enhance DMP ozonation process. A higher dipping Ce(NO3)(3) concentration and calcination process increase its microporous volume and surface area, and decreases its exterior surface area. The catalytic activity reaches optimal when 0.2% (w/w) cerium is deposited on activated carbon. Ce/AC catalyst was characterized by XRD, SEM and BET. The presence of either activated carbon or Ce/AC catalyst considerably improves their degradation and mineralization in the ozonation of DMP. During the ozonation (50 mg/h ozone flow rate) of a 30 mg/L DMP (initial pH 5.0) with the presence of Ce/AC catalyst, TOC removal rate reaches 68% at 60 min oxidation time, 48% using activated carbon as catalyst, only 22% with ozonation alone. The presence of tert-butanol (a well known (OH)-O-center dot radical scavenger) strongly inhibits DMP degradation by activated carbon or Ce/AC catalytic ozonation. TOC removal rate follows the second-order kinetics model well. In the ozonation of DMP with 50 mg/h ozone flow rate, its mineralization rate constant with the presence of Ce/AC catalyst is 2.5 times higher than that of activated carbon, 7.5 times higher than that Of 03 alone. Ce/AC catalyst shows the better catalytic activity and stability based on 780 min sequential reaction in the ozonation of DMP Ce/AC was a promising catalyst for ozonizing organic pollutants in the aqueous solution. (C) 2009 Elsevier B.V. All rights reserved.