Cobalt tetracarboxyl phthalocyanine-manganese octahedral molecular sieve (OMS-2) as a heterogeneous catalyst of peroxymonosulfate for degradation of diclofenac. (March 2019)

• Record Type: Journal Article
• Authors: Wu, Minhui; Fu, Kun; Deng, Huiping; Shi, Jun
• Is Part Of: Chemosphere. Volume 219(2019)
• Page Start: 756
• Page End: 765
• Publication Date: 2019-03
• Subjects: Cobalt phthalocyanine -- Manganese octahedral molecular sieve -- Peroxymonosulfate; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.12.030
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: A composite of cobalt tetracarboxyl phthalocyanine and amino-functionalized manganese octahedral molecular sieve (CNOMS-2) was synthesized in a simple way, and applied for degrading diclofenac in aqueous media by catalyzing of peroxymonosulfate heterogeneously. The experiment results revealed that the CNOMS-2/PMS system was highly efficient for DCF degradation in the pH range of 5–9, and the mechanism involved the generation of OH, SO4 ⁻ and 1 O2 by the activation of PMS. The main reactive oxygen species was found to be 1 O2 by radical scavenging experiments and electron paramagnetic resonance (EPR) spectroscopy. Further, a carboxylation product of DCF at m / z 340 was found to be a prominent intermediate of the reaction in this system specially, as determined by LC-MS/MS. The reusability and ion leaching concentrations under different pH were also examined to determine the application prospects of the catalyst. Graphical abstract: Image 1 Highlights: Synthesized cobalt phthalocyanine-amino-functionalized OMS-2 (CNOMS-2) composite. CNOMS-2 was used for diclofenac (DCF) degradation by peroxymonosulfate activation. Heterogeneous CNOMS-2 catalyst was highly efficient for DCF catalytic degradation. 1 O2 species proved more significant than OH and SO4 ⁻ in degrading DCF. CNOMS-2 showed good stability and high catalytic activity even after four cycles.