Photocatalytic degradation of ammonia-nitrogen via N-doped graphene/bismuth sulfide catalyst under near-infrared light irradiation

Wenxiao Liu, Shouqing Liu

Article ID: 1357
Vol 4, Issue 2, 2021

VIEWS - 1043 (Abstract) 225 (PDF)

Abstract


The N-doped graphene/bismuth sulfide (NG/Bi2S3) composite was synthesized by hydrothermal method. The structure and properties of the catalyst were characterized by X-ray powder diffraction, Raman spectroscopy, scanning electron microscopy and UV-visible near-infrared diffuse reflectance spectroscopy. The degradation of ammonia-N was studied using 0.050 g NG/Bi2S3 as photocatalyst under near-infrared light irradiation. The results show that the degradation ratio of ammonia-N reaches 91.4% in 100.0 mg·L-1 ammonia-N solution with pH 9.0 under near-infrared light irradiation for 10 h. Under similar conditions，the degradation ratio of ammonia-N is only 65.5% when pure Bi2S3 is used as the photocatalyst. Kinetic studies show that the ammonia-N degradation follows the first-order reaction kinetics, and the average value of the apparent rate constant is 0.1240 h-1. Catalyst stability studies show that the degradation ratio of ammonia nitrogen in 7 runs is still greater than 85.5%, which indicates that the NG/Bi2S3 composite catalyst is very stable.

Keywords


NG/Bi2S3; Near-infrared; Photocatalysis; Ammonia Nitrogen; Degradation

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DOI: https://doi.org/10.24294/ace.v4i2.1357

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