g-C3N4/rGO/TiO2光催化材料降解模拟污水中氨氮

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Abstract Using self-made g-C₃N₄, graphene oxide (GO) and TiO₂ as raw materials, the g-C₃N₄/rGO/TiO₂ photocatalyst with reduced graphene oxide (rGO) as photo-generated electron transport medium was successfully prepared through electrostatic adsorption and hydrothermal reduction processes, and the morphologies, structures and optical properties of the catalysts were characterized by SEM, X-ray diffraction (XRD), UV-Vis-DRS and photocurrent density test. Ammonia nitrogen solution with nitrogen concentration of 50mg/L was used as the simulated raw water, and the pH of ammonia nitrogen solution was adjusted to 9~10. The photocatalytic property of this photocatalyst for ammonia nitrogen removal was studied under the irradiation of a xenon lamp. The SEM results showed that g-C₃N₄/rGO/TiO₂ photocatalytic material was coated with TiO₂ as the coating layer, the XRD pattern of the composite exhibited both diffraction peaks of TiO₂ and g-C₃N₄, and the DRS spectrum showed that the optical absorption capacity of the composite photocatalyst was significantly enhanced in the visible region. Experiments on ammonia nitrogen removal showed that the composite photocatalyst with raw material GO:g-C₃N₄=1:10possessed best photocatalytic performance in ammonia nitrogen degradation, and the average removal rate of ammonia nitrogen was 96.80%. From the results of the electron paramagnetic resonance (EPR), it was speculated that the degradation mechanism was that the superoxide anion radical and hydroxyl radical generated by the composite catalyst oxidize the adsorbed NH₃ directly on the surface of the material under light irradiation, and rGO played a conduction role as the photocatalytic material's photo-generated charges transmission medium.

Key words： photocatalysis g-C₃N₄ TiO₂ ammonia nitrogen

Received: 13 February 2020

PACS:

X703

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	CAO Ya-jie
	YUE Xiu-ping
	LI Hou-fen
	XUE Shuai
	KONG Xin
	LI Hui
	CAO Fang

Cite this article:

CAO Ya-jie,YUE Xiu-ping,LI Hou-fen等. The photocatalytic property of g-C₃N₄/rGO/TiO₂ photocatalyst for ammonia nitrogen degradation in simulated wastewater[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4370-4377.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4370

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