Preparation of AgI sensitized amorphous TiO₂ as novel high-performance photocatalyst for environmental applications

Journal of Colloid and Interface Science
Qi WangYanqing Cong

Abstract

A novel visible-light-active material was prepared by dispersion of AgI on amorphous TiO2 through simple one-pot process (AgI/Am-TiO2-S). For comparison, AgI sensitized TiO2 (amorphous, anatase and P25) were also prepared via traditional deposition-precipitation method. The samples were characterized by XRD, XPS, TGA-DSC, UV-Vis-DRS, BET, and etc. Larger specific surface area, negative shift of flat band potential, as well as greatly reduced charge transfer resistance were observed for AgI/Am-TiO2-S comparing to other samples. Moreover, with the same molar of initial Ti and Ag, the weight of AgI/Am-TiO2-S obtained was the heaviest, due to large amount of surface titania hydrate. The photocatalytic activity of the as-prepared AgI/titania samples were evaluated by the reduction of Cr(VI) in the absence or presence of organic pollutants (dyes, phenol). AgI/Am-TiO2-S always presented the highest photocatalytic activity. The estimated k(Cr(VI)) on AgI/Am-TiO2-S was about 2 times that on AgI/P25-TiO2 in the absence/presence of RhB. Superior stability was also observed in the cyclic runs indicating that the as-prepared AgI/Am-TiO2-S is highly desirable for the remediation of Cr(VI)-organic co-contaminated wastewaters.

References

Jul 9, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Yuanzhi LiSun-Jae Kim
Apr 23, 2010·Environmental Science & Technology·Alok D Bokare, Wonyong Choi
Oct 8, 2008·Nanotechnology·Hao Feng LuHui-Ming Cheng
Apr 24, 2012·Environmental Science & Technology·Damián Monllor-SatocaWonyong Choi
May 11, 2012·Journal of Colloid and Interface Science·Shuang SongJianmeng Chen

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