Cu doped MnO2/γ-Al2O3: a facile and efficient catalyst for the degradation of Na2S in waste water under ambient conditions

• Published in: Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2020-04, Vol.129 (2), p.1047-1059
• Main Authors: Cui, Wenyao, Zhao, Rui, Huang, Xiaoqiao, Li, Jianxin, Xiao, Zaozao, Duan, Yongsheng, Yan, Lijun, Lu, Shuxiang, Liao, Xiaoyuan
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Physical Chemistry
• ISSN: 1878-5190; 1878-5204
• DOI: 10.1007/s11144-020-01755-2

A series Cu decorated MnO 2 /γ-Al 2 O 3 catalysts (Cu load, 1%, 3% and 5%) was fabricated by facile co-impregnation method, and investigated for the catalytic oxidative removal Na 2 S in waste water. Compared with MnO 2 /γ-Al 2 O 3 , the catalytic activity and stability of Cu-MnO 2 /γ-Al 2 O 3 , was enhanced by modifying with Cu element. XRD, SEM, BET, H 2 -TPR and XPS were carried out to characterize these catalyst. XRD and BET show the Cu successfully decorated on the MnO 2 /γ-Al 2 O 3 , and catalyst’s pristine structure are well maintained. SEM shows that the doped Cu species benefits to the uniform dispersion of Mn species, H 2 -TPR suggests that the reodox capacity of Cu decorated catalysts were improved after doping with Cu, and XPS shows that doped Cu produces higher concentration of Mn 4+ and O ads (surface active oxygen species), also expediting the redox cycling between Mn 4+ /Mn 3+ and the promote the O ads production, which resulting in the enhancement of redox properties. Hence, 3%Cu-MnO 2 /γ-Al 2 O 3 catalyst could achieve 97.5% degradation of Na 2 S in waste water at room conditions in 2 h, by the help of air, this result is superior to other published work.