Degradation of sulfamethoxazole by super-hydrophilic MoS2 sponge co-catalytic Fenton: Enhancing Fe2+/Fe3+ cycle and mass transfer

• Published in: Journal of hazardous materials 2023-09, Vol.458, p.131878-131878, Article 131878
• Main Authors: Xiao, Chun, Hu, Yongyou, Li, Qitian, Liu, Jingyu, Li, Xian, Shi, Yueyue, Chen, Yuancai, Cheng, Jianhua, Zhu, Xiaoqiang, Wang, Guobin, Xie, Jieyun
• Format: Article
• Language: English
• Subjects: Co-catalytic Fenton; Hydrophilicity; MoS2; Reactor; Sponge
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2023.131878

To promote the cycle of Fe2+/Fe3+ in co-catalytic Fenton and enhance mass transfer in an external circulation sequencing batch packed bed reactor (ECSPBR), super-hydrophilicity MoS2 sponge (TMS) modified by tungstosilicic acid (TA) was prepared for efficiently degrading sulfamethoxazole (SMX) antibiotics in aqueous solution. The influence of hydrophilicity of co-catalyst on co-catalytic Fenton and the advantages of ECSPBR were systematically studied through comparative research methods. The results showed that the super hydrophilicity increased the contact between Fe2+ and Fe3+ with TMS, then accelerated Fe2+/Fe3+ cycle. The max Fe2+/Fe3+ ratio of TMS co-catalytic Fenton (TMS/Fe2+/H2O2) was 1.7 times that of hydrophobic MoS2 sponge (CMS) co-catalytic Fenton. SMX degradation efficiency could reach over 90% under suitable conditions. The structure of TMS remained unchanged during the process, and the max dissolved concentration of Mo was lower than 0.06 mg/L. Additionally, the catalytic activity of TMS could be restored by a simple re-impregnation. The external circulation of the reactor was conducive to improving the mass transfer and the utilization rate of Fe2+ and H2O2 during the process. This study offered new insights to prepare a recyclable and hydrophilic co-catalyst and develop an efficient co-catalytic Fenton reactor for organic wastewater treatment. [Display omitted] •Hydrophilic MoS2 sponge was prepared and used for SMX degradation.•Enhanced hydrophilicity of MoS2 sponge further improved Fe2+/Fe3+ cycle.•External circulation improved the mass transfer efficiency of the reactor.•Long term stable operation of the reactor proved the potential application of TMS.