Effective removal of high-chroma crystal violet over TiO2-based nanosheet by adsorption-photocatalytic degradation
Effective removal of high-chroma crystal violet over TiO2-based nanosheet by adsorption-photocatalytic degradation
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DOI：
10.1016/j.cej.2012.07.030
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发表时间：
2012-09-15
影响因子：
15.1
通讯作者：
Dai, Yiqun
中科院分区：
文献类型：
--
作者：
Chen, Feitai;Fang, Pengfei;Dai, Yiqun
采用碱性水热处理法制备了P25纳米片，并用透射电子显微镜、X射线衍射仪和氮气吸附-脱附测试对其进行了表征。系统研究了其对高色度结晶紫(CV)的吸附和再生性能。与原料P25相比，制备的TNS具有更高的比表面积，达到207m(2)/g，对CV有更强的吸附能力。由Langmuir等温式测得TNS的最大吸附容量为56.3 mg/g，吸附容量的提高归因于比表面积的增加和表面羟基的增加，从而提供了更多的吸附中心和更强的静电吸引。进一步研究发现，在紫外可见光下，H_2O_2能与TNS产生协同光催化降解作用，并通过H_2O_2辅助的光催化降解过程有效地实现了TN的再生。循环吸附-再生实验表明，制备的TNS具有良好的重复使用性，可用于染料废水的处理。(C)2012爱思唯尔B.V.保留所有权利。
TiO2-based nanosheet (INS) was prepared by the alkaline hydrothermal treatment of P25, which was characterized with transmission electron microscopy (TEM), X-ray diffraction (XRD) and nitrogen adsorption-desorption measurement. Its adsorption and regeneration properties for removal of high-chroma crystal violet (CV) were systematically investigated. The prepared TNS has much higher specific surface area of 207 m(2)/g and exhibits much stronger adsorption for CV than the raw material P25. The maximum adsorption capacity of TNS as determined from the Langmuir isotherm is 56.3 mg/g. The enhancement of adsorption capacity is ascribed to the increasing of specific surface area and surface hydroxyl groups, which can provide much more adsorption sites and stronger electrostatic attraction. It was further found that H2O2 can produce a synergetic photocatalytic degradation effect with TNS under UV-Vis irradiation, and the regeneration of TNS was effectively achieved by H2O2-assisted photocatalytic degradation process. The good reusability of prepared TNS in the cyclic adsorption-regeneration experiments indicates that it may be useful for dealing with dye wastewater. (C) 2012 Elsevier B.V. All rights reserved.