%0 Journal Article
%T A performance comparison of arsenate removal from water by five iron oxides<br>5种铁氧化物去除As(V)性能的比较研究
%A Dou Xiaomin
%A Yu Xin
%A Zhao Bei
%A Zhang Yansu
%A Ji Xiaoling
%A <br>豆小敏
%A 于新
%A 赵蓓
%A 张艳素
%A 纪小玲
%J 环境工程学报
%D 2010
%I 
%X In order to obtain high efficient and low-cost adsorbent for arsenate removal, five iron oxides were evaluated and compared in batch adsorption tests. The results showed that the adsorption capacities decreased in the following order: schwertmannite>akáganite>ferrihydrite>hematite>goethite, and the adsorption process followed a pseudo-second order reaction model. Adsorption approached equilibrium by about 24 h. Due to schwertmannite had a maximum adsorption capacity of 83 mg-As(V)/g-adsorbent at pH 5 among these iron oxides, so it was used in the treatment of simulated groundwater containing high contents of arsenic (1.484 mg/L and 0.850 mg/L, respectively) and TOC at high pH values. It was found that the residual arsenic in both samples could be effectively decreased to 0.01 mg/L at dosages of 500 mg/L and 300 mg/L adsorbent, respectively. Then, schwertmannite was characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and surface potential titration. SO2-4 was observed to be existed in the bulk or on the surface of schwertmannite, the site density for proton was about 4.32 sites/nm2, and the protonation constants of pK1 and pK2 were 4.60 and -8.98, respectively.
%K the iron oxides
%K arsenic
%K adsorption
%K schwertmannite<br>铁氧化物
%K 砷
%K 吸附
%K 施氏矿物
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=92E6F4267FD4CBCB51B1E49E014D8054&jid=3567BD61129AA59043F5DE01F8815DB5&aid=9D0EBAE8E76BEB6111FF23F294E893CE&yid=140ECF96957D60B2&vid=E158A972A605785F&iid=9CF7A0430CBB2DFD&sid=1833A6AA51F779C1&eid=3EBE383EEA0A6494&journal_id=1673-9108&journal_name=环境工程学报&referenced_num=0&reference_num=0