TY - JOUR
T1 - Efficient degradation of sulfamethazine with CuCo2O4 spinel nanocatalysts for peroxymonosulfate activation
AU - Feng, Yong
AU - Liu, Jinhua
AU - Wu, Deli
AU - Zhou, Zhengyuan
AU - Deng, Yu
AU - Zhang, Tong
AU - Shih, Kaimin
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/11/5
Y1 - 2015/11/5
N2 - CuCo2O4 spinel nanoparticles (NPs) synthesized using a solvothermal method were used as catalysts to activate peroxymonosulfate (PMS) with sulfamethazine (SMZ) as the target pollutant. A degradation efficiency of 87.2% was achieved in 20min with 20mgL-1 PMS and 0.01gL-1 CuCo2O4 catalyst. In contrast, only 51.1%, 11.3%, 12.5%, and 7.9% degradations of SMZ were observed with Co3O4, CuFe2O4, CuO, and Fe3O4, respectively, as the catalysts. The superior catalytic reactivity of CuCo2O4 was explained with the presence of Co2+ on the catalyst surface and the combined catalytic reactivity of copper and cobalt towards PMS. Based on the XPS results and the relative catalytic reactivity of Cu2+ and Cu+, it was proposed that the Cu2+/Cu+ circulation was least likely the key reaction steps. Instead, a complex reaction mechanism involving the generation of Cu3+ was used to explain the activation of PMS by Cu2+. The investigation on the reaction parameters showed that the SMZ degradation efficiency responded positively to increases in the PMS dose and the scavenger effect. A mild alkaline condition favored the degradation of SMZ, and an optimized operational condition was found to achieve 98% SMZ degradation with 20mgL-1 PMS, 0.04gL-1 CuCo2O4, and 5mgL-1 SMZ at pH 7.7. The activation energy of SMZ degradation was thus estimated to be 21.0kJmol-1 for the CuCo2O4/PMS system and 38.4kJmol-1 for the CuFe2O4/PMS system. Finally, a degradation mechanism on the basis of analyzing the degradation products of SMZ was proposed and the stability and reusability of the CuFe2O4 NPs were evaluated.
AB - CuCo2O4 spinel nanoparticles (NPs) synthesized using a solvothermal method were used as catalysts to activate peroxymonosulfate (PMS) with sulfamethazine (SMZ) as the target pollutant. A degradation efficiency of 87.2% was achieved in 20min with 20mgL-1 PMS and 0.01gL-1 CuCo2O4 catalyst. In contrast, only 51.1%, 11.3%, 12.5%, and 7.9% degradations of SMZ were observed with Co3O4, CuFe2O4, CuO, and Fe3O4, respectively, as the catalysts. The superior catalytic reactivity of CuCo2O4 was explained with the presence of Co2+ on the catalyst surface and the combined catalytic reactivity of copper and cobalt towards PMS. Based on the XPS results and the relative catalytic reactivity of Cu2+ and Cu+, it was proposed that the Cu2+/Cu+ circulation was least likely the key reaction steps. Instead, a complex reaction mechanism involving the generation of Cu3+ was used to explain the activation of PMS by Cu2+. The investigation on the reaction parameters showed that the SMZ degradation efficiency responded positively to increases in the PMS dose and the scavenger effect. A mild alkaline condition favored the degradation of SMZ, and an optimized operational condition was found to achieve 98% SMZ degradation with 20mgL-1 PMS, 0.04gL-1 CuCo2O4, and 5mgL-1 SMZ at pH 7.7. The activation energy of SMZ degradation was thus estimated to be 21.0kJmol-1 for the CuCo2O4/PMS system and 38.4kJmol-1 for the CuFe2O4/PMS system. Finally, a degradation mechanism on the basis of analyzing the degradation products of SMZ was proposed and the stability and reusability of the CuFe2O4 NPs were evaluated.
KW - Advanced oxidation
KW - CuCoO catalyst
KW - Peroxymonosulfate
KW - Sulfamethazine
UR - http://www.scopus.com/inward/record.url?scp=84934889921&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2015.05.121
DO - 10.1016/j.cej.2015.05.121
M3 - 文章
AN - SCOPUS:84934889921
SN - 1385-8947
VL - 280
SP - 514
EP - 524
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -