Ti₃C₂ MXene and Ni²⁺ Enhanced Peroxymonosulfate Activation for Dyeing Wastewater Degradation

Abstract

Dyeing wastewater has the problems of complex composition, deep color and difficulty in degradation, which seriously threaten the ecological environment. This study investigated the Ni²⁺/peroxymonosulfate(PMS)/MXene system for efficient degradation of the dyeing wastewater with lower metal consumption. The reactive red 24(RR24) simulated dyeing wastewater was used as the research object. The influences of mass concentrations of PMS, Ni²⁺, MXene and RR24, and initial pH values on RR24 degradation were explored. The contribution of free radicals in the degradation of dyes was investigated by free radical quench experiments. The results showed that the degradation percentage of RR24 was as high as 96.62% using a mixture of 7.5 g/L PMS, 100 mg/L Ni²⁺ and 210 mg/L MXene at 25℃ for 60 min. Under neutral conditions, compared with the system without Ti_3C₂ MXene, the degradation percentage of RR24 increased by 2.04 times. In this system, the ·OH radical played a dominant role. When the dyeing wastewater was treated by using the Ni²⁺/PMS/MXene system, the inorganic salts significantly altered the degradation rate of the dyeing wastewater, but only slightly affected the final degradation percentage.

Keywords

reactive dye / Ti₃C₂ MXene / Ni²⁺ / peroxymonosulfate

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Funding

Innovation and Entrepreneurship Training Program for College Students, China(X202410082063)

Youth Foundation of Hebei Province Department of Education Fund, China(QN2023090)

Hebei Natural Science Foundation, China(B2020208061)