Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2021-07-29 , DOI: 10.1016/j.jtice.2021.07.005 Li Li 1 , Jie Gao 1 , Yiming Yuan 2 , Sai Zhang 1 , Ming Liang 1 , Yuan Liu 1
Background
Heterojunction catalysts have been used in photo-Fenton reaction. However, the rapid recombination of photo-generated electron-hole would reduce the reaction and decrease the organic degradation rate.
Methods
In order to improve the photocatalytic performance of g-C3N4 and the dispersion of FeS2 in solution, FeS2/g-C3N4 with Schottky junction was prepared by introducing FeS2 to g-C3N4. The hybridized FeS2/g-C3N4 heterojunction was thoroughly characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible diffuse reflectance spectroscopy (UV–vis DRS), photocurrent and photoluminescence (PL) emission. The ratio of FeS2 and g-C3N4 in the material was optimized on the photocatalytic performance. Meanwhile, the photocatalytic activity was evaluated in the removal of tetracycline (TC) under visible light. Furthermore, the reactive species were identified through quenching tests and a possible mechanism of the reaction was put forward. Degradation pathway of TC was proposed and toxicity assessment of intermediates were conducted.
Significant findings
The 20% FeS2/g-C3N4 sample showed the most effective and economical photocatalytic efficiency. The TC degradation was apparently enhanced in FeS2/g-C3N4/H2O2 system comparing with FeS2/H2O2 or g-C3N4/H2O2. Results showed that FeS2/g-C3N4 was a steady catalyst through investigating the effect of environment parameters and composite recyclability.
中文翻译:
FeS2/g-C3N4作为光芬顿异质结催化剂在可见光下用H2O2降解四环素的研究
背景
异质结催化剂已用于光芬顿反应。然而,光生电子-空穴的快速复合会减少反应并降低有机降解率。
方法
为了提高GC的光催化性能3 Ñ 4和FeS的分散2在溶液中,的FeS 2 / GC 3 Ñ 4与肖特基结是通过将制备的FeS 2至GC 3 Ñ 4。杂化的 FeS 2 /gC 3 N 4通过扫描电子显微镜 (SEM)、X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、傅里叶变换红外光谱 (FT-IR)、紫外-可见漫反射光谱 (UV-vis DRS) 对异质结进行彻底表征)、光电流和光致发光 (PL) 发射。材料中FeS 2和gC 3 N 4的比例对光催化性能进行了优化。同时,评估了在可见光下去除四环素(TC)的光催化活性。此外,通过猝灭试验确定了反应物种,并提出了可能的反应机理。提出了TC的降解途径,并对中间体进行了毒性评价。
重要发现
20% FeS 2 /gC 3 N 4样品显示出最有效和最经济的光催化效率。与FeS 2 /H 2 O 2或gC 3 N 4 /H 2 O 2相比,FeS 2 /gC 3 N 4 /H 2 O 2体系中TC降解明显增强。结果表明,通过研究环境参数和复合材料可回收性的影响,FeS 2 /gC 3 N 4是一种稳定的催化剂。