1. Facile synthesis of ternary Ag/AgBr-Ag2CO3 hybrids with enhanced photocatalytic removal of elemental mercury driven by visible light.
- Author
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Zhang, Anchao, Zhang, Lixiang, Lu, Hao, Chen, Guoyan, Liu, Zhichao, Xiang, Jun, and Sun, Lushi
- Subjects
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SILVER compounds , *PHOTOCATALYSTS , *VISIBLE spectra , *X-ray diffraction , *ADSORPTION (Chemistry) , *SCANNING electron microscopy , *TEMPERATURE effect - Abstract
A novel technique for photocatalytic removal of elemental mercury (Hg 0 ) using visible-light-driven Ag/AgBr-Ag 2 CO 3 hybrids was proposed. The ternary Ag/AgBr-Ag 2 CO 3 hybrids were synthesized by a simple modified co-precipitation method and characterized by N 2 adsorption-desorption, scanning electron microscope (SEM), X-ray diffraction (XRD), UV–vis diffused reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) techniques. The effects of AgBr content, fluorescent lamp (FSL) irradiation, solution temperature, SO 2 and NO on Hg 0 removal were investigated in detail. Furthermore, a possible reaction mechanism for higher Hg 0 removal was proposed, and the simultaneous removal of Hg 0 , SO 2 and NO was studied. The results showed that a high efficiency of Hg 0 removal was obtained by using Ag/AgBr-Ag 2 CO 3 hybrids under fluorescent lamp irradiation. The AgBr content, FSL irradiation, solution temperature, and SO 2 all exhibited significant effects on Hg 0 removal, while NO had slight effect on Hg 0 removal. The addition of Ca(OH) 2 demonstrated a little impact on Hg 0 removal and could significantly improve the SO 2 -resistance performance of Ag/AgBr(0.7)-Ag 2 CO 3 hybrid. The characterization results exhibited that hydroxyl radical ( OH), superoxide radical ( O 2 − ), hole (h + ), and Br 0 , were reactive species responsible for removing Hg 0 , and the h + played a key role in Hg 0 removal. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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