Efficient degradation of crystal violet by GO/CuMn2O4 nanocomposite via peroxymonosulfate activation
Ayda Farajollahi, Ahmad Poursattar Marjani, Nader Noroozi Pesyan, Hassan Alamgholiloo
Abstract
The utilization of persulfate-based advanced oxidation processes (PS-AOPs) in the presence of nanomaterials has gained increased attention for the degradation of organic pollutants. Herein, a new methodology was described for the fabrication of GO/CuMn 2 O 4 nanocomposite for proxymonosulfate (PMS) activation in crystal violet (CV) degradation. The exfoliated GO sheets helped to control the crystallinity of CuMn 2 O 4 spontaneously with induce oxygen vacancies (OVs). Moreover, the active sites of copper and manganese and the high electronic conductivity of GO in nanocomposite exhibited a vital role in PMS activation for creating reactive oxygen radicals (ROS). The prepared nanocomposite indicated the highest degradation rate of CV (97 %) within 35 min with a rate constant of 0.101 min −1 . Furthermore, the scavenging technique demonstrated that the SO 4 − and OH radicals have a very important role in the removal reaction. The results indicated that the CV degradation in the presence of GO/CuMn 2 O 4 was better than alone-CuMn 2 O 4 , confirming the synergistic effect of GO layers with metal oxides. The current study has paved a new insight to employ bimetal oxide materials in the design of efficient nanocomposites for organic pollution degradation in wastewater.