Synthesis and Characterization of Bi3+-Doped Ag/AgCl and Enhanced Photocatalytic Properties
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- 作者：Limin Song ; Yamiao Li ; Shuna Zhang ; Shujuan Zhang
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：December 26, 2014
- 年：2014
- 卷：118
- 期：51
- 页码：29777-29787
- 全文大小：794K
- ISSN：1932-7455
文摘
Bi3+-doped Ag/AgCl photocatalytic materials were synthesized using a simple coprecipitation approach. Powder X-ray diffraction analysis revealed that Bi3+ was inserted into the crystal lattice of AgCl to partially replace Ag+, resulting in the contraction of AgCl lattice. Ultraviolet鈥搗isible absorption tests showed that the dopant Bi3+ slightly widened the band gap of AgCl as it raised the conduction level. X-ray photoelectron spectroscopy revealed the strong interaction between Bi3+, Ag+, and Cl鈥?/sup>, and also showed the presence of abundant Bi3+ on the surface of AgCl particles. Methyl orange (MO) photodegradation experiment showed the photocatalytic activity of the Bi3+-doped Ag/AgCl was significantly dependent on the amount of doped Bi3+. The Bi3+-doped Ag/AgCl (2 wt %) reached the highest activity of 91% after 8 min, while the pure Ag/AgCl degraded only 32% of MO. The degradation rate constant of Bi3+-doped Ag/AgCl was 3.75 times higher than that of pure Ag/AgCl. Electron spin resonance showed that 鈥?/sup>OH was the main active species during the oxidation of MO using the Bi3+-doped Ag/AgCl. During the photodegradation of MO, the photocatalytic activity of Ag/AgCl was first enhanced and then weakened along with the increased amount of Bi3+. These changes were theoretically attributed to the formation of chloride dangling bonds and vacancies induced by the dopant Bi3+. The chloride dangling bonds from Bi3+ also enhanced the photocatalytic activity of Ag/AgCl.