Degradation of hydrophobic organic pollutants by titania pillared fluorine mica as a substrate specific photocatalyst
Degradation of hydrophobic organic pollutants by titania pillared fluorine mica as a substrate specific photocatalyst
复制标题
DOI：
10.1016/j.apcatb.2004.08.005
复制
发表时间：
2005-01
影响因子：
22.1
通讯作者：
Ken-ichi Shimizu;H. Murayama;Ayumi Nagai;Aiko Shimada;Tsuyoshi Hatamachi;T. Kodama;Y. Kitayama
中科院分区：
文献类型：
--
作者：
Ken-ichi Shimizu;H. Murayama;Ayumi Nagai;Aiko Shimada;Tsuyoshi Hatamachi;T. Kodama;Y. Kitayama
在含 TiO2 催化剂的水悬浮混合物中进行光催化降解高度疏水且稳定的有机污染物 γ-六氯环己烷 (γ-HCH)。与大多数有机污染物不同，γ-六氯环己烷在传统的TiO2(P25)光催化条件下非常稳定。在各种催化剂中，TiO2柱撑氟云母（Ti-mica）表现出最高的活性。还考察了钛云母制备方法的效果。 The hydrothermal treatment increased the crystallinity of anatase pillar of Ti-mica, though the treatment at high temperature resulted in a decrease in the surface area and an increase in the pore size.因此，在最低温度（373K）下处理的钛云母Ti-mica-373是最有效的光催化剂。比较了TiO2和Ti-mica-373对13种不同疏水性有机化合物的催化活性。 Ti-mica-373对低浓度(10ppb)疏水性有机污染物(α、β、γ和δ-HCH、反式和顺式氯丹、DDE、DDD和DDT)的降解率比TiO2高5-66倍。相比之下，TiO2 对疏水性较低的化合物（苯甲腈、氯苯、4-氯苯乙酮和 4-氯硝基苯）的降解率高于 Ti-mica-373。在 TiO2-mica-373 上，logPOW 值较高的有机化合物（即疏水性较高的化合物）的分解速度较高。氟云母载体的积极作用被认为是由疏水性反应物与柱撑粘土的疏水性夹层表面的相互作用引起的。
The photocatalytic degradation of a highly hydrophobic and stable organic pollutant, γ-hexachlorocyclohexane (γ-HCH), was performed in aqueous suspended mixture of TiO2-containing catalysts. Unlike most of the organic pollutants, γ-HCH was very stable under the conventional photocatalytic condition with TiO2(P25). Among various catalysts, TiO2pillared fluorine mica (Ti-mica) showed highest activity. The effect of preparation method of Ti-mica was also examined. The hydrothermal treatment increased the crystallinity of anatase pillar of Ti-mica, though the treatment at high temperature resulted in a decrease in the surface area and an increase in the pore size. Consequently, Ti-mica treated at lowest temperature (373K), Ti-mica-373, was the most effective photocatalyst. The catalytic activity of TiO2and Ti-mica-373 was compared for 13 kinds of organic compounds with various hydrophobicity. Ti-mica-373 showed 5–66 times higher rate than TiO2for the degradation of hydrophobic organic pollutants (α, β, γ and δ-HCH, trans- and cis-chlordane, DDE, DDD and DDT) of low concentration (10ppb). In contrast, TiO2showed higher rate than Ti-mica-373 for the degradations of less hydrophobic compounds (benzonitrile, chlorobenzene, 4-chloroacetophenone and 4-chloronitrobenzene). Over TiO2-mica-373, organic compounds with higher logPOWvalue, i.e. more hydrophobic compounds, were decomposed with higher rate. A positive effect of the fluorine mica support is suggested to be caused by the interaction of hydrophobic reactant with the hydrophobic interlayer surface of pillared-clay.