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J. Korean Ceram. Soc. > Volume 58(5); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(5): 548-558.
doi: https://doi.org/10.1007/s43207-021-00115-7
Synthesis of g-C3N4/diatomite/MnO2 composites and their enhanced photo-catalytic activity driven by visible light
Ran-Ran Chen1,2, Qi-Fang Ren1, Yu-Xin Liu1, Yi Ding1,2, Hai-Tao Zhu1,2, Chun-Yu Xiong1,2, Zhen Jin2, Won-Chun Oh3
1Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, Anhui, China
2Key Laboratory of Huizhou Architecture in Anhui Province, Anhui Jianzhu University, Hefei 230022, Anhui, China
3Department of Advanced Materials Science and Engineering, Hanseo University, Seosan 31962, Republic of Korea
Correspondence  Yi Ding ,Email: dyrqf@ahjzu.edu.cn
Won-Chun Oh ,Email: wc_oh@hanseo.ac.kr
Received: October 1, 2020; Revised: January 25, 2021   Accepted: February 2, 2021.  Published online: September 30, 2021.
Herein, a novel visible-light-responsive g-C3N4/diatomite/MnO2 composite was successfully fabricated through a simple redox reaction method. The structure and morphology of the sample are mainly characterized by X-ray diffraction (XRD), photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and ultraviolet–visible spectroscopy (UV–Vis). In this paper, the photo-catalytic activity of the sample was evaluated by degradation RhB under visible-light irradiation. The results shown that, compared with g-C3N4/diatomite composite, MnO2 , g-C3N4, diatomite, the prepared g-C3N4/diatomite/2.5%MnO2 composite exhibits better photo-catalytic activity and stability. At the same time, the effect of different MnO2 additions on the photo-catalytic activity of the composite material was further analyzed. The results indicated that the g-C3N4/MnO2/diatomite composites exhibit highest photo-catalytic activity when the adding amount of MnO2 reached 2.5%. The degradation rate of the g-C3N4/diatomite/2.5%MnO2 is 93% after recycling for three times, showing good stability and reusability. Moreover, the mechanism of catalytic performance enhancement also has been discussed.
Key words: g-C3N4/diatomite/MnO2 · Degradation · RhB
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