Citation: Jian Tian, Zhen Wu, Zhen Liu, Changlin Yu, Kai Yang, Lihua Zhu, Weiya Huang, Yang Zhou. Low-cost and efficient visible-light-driven CaMg(CO₃)₂@Ag₂CO₃ microspheres fabricated via an ion exchange route[J]. Chinese Journal of Catalysis, ;2017, 38(11): 1899-1908. doi: 10.1016/S1872-2067(17)62924-3 shu

Low-cost and efficient visible-light-driven CaMg(CO₃)₂@Ag₂CO₃ microspheres fabricated via an ion exchange route

Jian Tian ^a, ,
Zhen Wu ^a ,
Zhen Liu ^a ,
Changlin Yu ^a,b ,
Kai Yang ^a,c ,
Lihua Zhu ^a ,
Weiya Huang ^a ,
Yang Zhou ^a

a School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China;
b School of Chemistry and Environmental Engineering, Wuyi University, Jiangmen 529020, Guangdong, China;
c State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, Fujian, China

Received Date: 31 July 2017
Revised Date: 24 September 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21567008,21607064,21707055,21763011), Program of Qingjiang Excellent Young Talents, Jiangxi University of Science and Technology, Program of 5511 Talents in Scientific and Technological Innovation of Jiangxi Province (20165BCB18014), Academic and Technical Leaders of the Main Disciplines in Jiangxi Province (20172BCB22018), and Jiangxi Province Natural Science Foundation China (20161BAB203090, 20161BAB213083, 20171ACB21041).

CaMg(CO₃)₂ microspheres were prepared and used as hard templates to fabricate a series of CaMg(CO₃)₂@Ag₂CO₃ composite microspheres via a fast and low-cost ion exchange process. The effects of ion exchange time and temperature on the physicochemical properties and photocatalytic activities of the composite microspheres were studied through photocatalytic degradation of Acid Orange Ⅱ under xenon lamp irradiation. The obtained samples were analyzed by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, UV-vis diffuse reflectance spectroscopy, N₂ physical adsorption, and photocurrent tests. The CaMg(CO₃)₂@Ag₂CO₃ sample with the highest activity was obtained with an ion exchange time of 4 h and temperature of 40℃. The degradation rate of Acid Orange Ⅱ by this sample reached 83.3% after 15 min of light irradiation, and the sample also performed well in phenol degradation. The CaMg(CO₃)₂@Ag₂CO₃ produced under these ion exchange conditions showed a well-ordered hierarchical morphology with small particle sizes, which was beneficial to light absorption and the transfer of photoelectrons (e^-) and holes (h⁺) to the catalyst surface. Moreover, the separation of photogenerated carriers over the composites was greatly improved relative to bare CaMg(CO₃)₂. Despite the very low content of Ag₂CO₃ (2.56%), excellent photocatalytic performance was obtained over the CaMg(CO₃)₂@Ag₂CO₃ microspheres.
- Hard template,
- Ion exchange,
- CaMg (CO₃)₂@Ag₂CO₃ microspheres,
- Photocatalytic performance
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Low-cost and efficient visible-light-driven CaMg(CO₃)₂@Ag₂CO₃ microspheres fabricated via an ion exchange route