Synthesis and photocatalytic degradation ability evaluation for rhodamine B of ZnO@SiO2 composite with flower-like structure

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Xiaoyi ShenYuchun Zhai

Abstract

ZnO@SiO2 composite with flower-like structure was successfully prepared with molar ratio of ZnO/SiO2 = 1:1 based on the optimized synthesizing parameters of spherical SiO2 and flower-like ZnO. SiO2 particles were coated on the flower-like ZnO to form a homogeneous film through the multidimensional polycondensation of Si(OH)4. The photocatalytic degradation ability of ZnO@SiO2 composite for rhodamine B (RhB) obtained at different ZnO/SiO2 molar ratio and the comparison to that of flower-like ZnO showed that ZnO@SiO2 composite with ZnO/SiO2 molar ratio of 1:1 displayed a relatively good photocatalytic degradation ability to degrade RhB, but it was weaker than that of flower-like ZnO. Twenty millilitres of RhB solution at a concentration of 15 mg·L-1 could be completely degraded by 300 mg flower-like ZnO powder within 3 h, while the degrading efficiency was only 82.5% by 300 mg ZnO@SiO2 composite. But ZnO@SiO2 composite showed a better photocatalytic activity than flower-like ZnO at a lower pH value of 4.5.

References

Apr 18, 2012·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Chao-Yin Kuo, Chueh-Ying Pai
Mar 10, 2015·Journal of Colloid and Interface Science·Hongshun ZhouZheng Jiao
Oct 26, 2016·Environmental Science and Pollution Research International·Naghmeh Abuali GaledariMinoo Tasbihi

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Citations

Dec 20, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Xiaoyi ShenMinghua Wang

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