Preparation of Fe3O4@GO@MIL-101 nanocomposites and efficient degradation of oxytetracycline hydrochloride by promoting charge separation during the photo-Fenton process

被引:13
作者
He, Lin [1 ]
Zhou, Jiabin [1 ,2 ]
Liu, Dan [1 ,2 ]
Wen, Yajie [1 ]
Gan, Yuxin [1 ]
机构
[1] Southwest Petr Univ, Sch Chem & Chem Engn, Chengdu 610500, Peoples R China
[2] Oil & Gas Field Appl Chem Key Lab Sichuan Prov, Chengdu 610500, Peoples R China
关键词
Heterogeneous catalysis; Fenton-like system; Oxytetracycline hydrochloride; Water treatment; WASTE-WATER; PHOTOCATALYTIC ACTIVITY; AQUEOUS-SOLUTION; REMOVAL; SHELL; CATALYSTS; ORANGE; ANTIBIOTICS; PERFORMANCE; COMPOSITES;
D O I
10.1016/j.mssp.2023.108050
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The combination of photocatalysis and Fenton oxidation technology is an efficient strategy to improve the ef-ficiency of oxytetracycline hydrochloride (OTC-HCl) degradation. Herein, a Fe3O4@GO@MIL-101 composite catalyst bridged with graphene oxide (GO) was obtained by a two-stage hydrothermal method. The introduced graphene oxide layer could inhibit the recombination of electron hole (e-- h+) pairs by attracting photo -generated electrons from MIL-101 and transferring them to Fe3O4, observably enhancing the photocatalytic performance of the composite Fe3O4/MOFs. Under the optimal conditions (initial pH, 10 mmol H2O2, 0.01 g/L catalyst), the Fe3O4@GO@MIL-101 + H2O2+Vis system could achieve a degradation effect of 97.26 % on 70 mg/ L OTC-HCl within 50 min Fe3O4@GO@MIL-101 nanocomposites exhibited good recyclability, were easy to recover after multiple uses, and maintained excellent removal efficiency for pollutants. A series of data demonstrated that in Fe3O4@GO@MIL-101 + H2O2+Vis system, the primary active substances involved in OTC-HCl degradation were holes and superoxide radicals, while the contributions of hydroxyl radicals and photo generated electrons were relatively weak. Finally, based on various characterization results and catalyst activity performance, a feasible mechanism for the removal of OTC-HCl by Fenton-like system was proposed.
引用
收藏
页数:13
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