title: Degradation of refractory dibutyl phthalate by peroxymonosulfate activated with novel catalysts cobalt metal-organic frameworks: Mechanism, performance, and stability.
abstract: In this work, a new effective and relatively stable heterogeneous catalyst of Metal-Organic Framework Co3(BTC)2·12H2O (Co-BTC) has been synthesized and tested to activate peroxymonosulfate (PMS) for removal of refractory dibutyl phthalate (DBP). Co-BTC(A) and Co-BTC(B) were synthesized by different methods, which resulted in different activity towards PMS. The results indicated that Co-BTC(A) showed better performance on DBP degradation. The highest degradation rate of 100% was obtained within 30min. The initial pH showed respective level on DBP degradation with a rank of 5.0>2.75>9.0>7.0>11.0 in PMS/Co-BTC(A) system. No remarkable reduction of DBP was observed in the catalytic activity of Co-BTC(A) at 2nd run as demonstrated by recycling. However, the DBP degradation efficiency decreased by 8.26%, 10.9% and 25.6% in the 3rd, 4th, and 5th runs, respectively. The loss of active catalytic sites of Co(II) from Co-BTC(A) is responsible for the activity decay. Sulfate radicals (SO4(-)) and hydroxyl radicals (OH) were found at pH 2.75. Here, we propose the possible mechanism for activation of PMS by Co-BTC(A), which is involved in homogeneous and heterogeneous reactions in the solutions and the surface of Co-BTC(A), respectively.
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; Columbia Nanomechanics Research Center, Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA.
authors.forename: Huanxuan
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; State Key Lab Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China. Electronic address: ppjqwan@scut.edu.cn.
authors.forename: Jinquan
authors.initials: J
authors.lastname: Wan
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; State Key Lab Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China.
authors.forename: Yongwen
authors.initials: Y
authors.lastname: Ma
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Columbia Nanomechanics Research Center, Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA.
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Zeyu
authors.initials: Z
authors.lastname: Guan
keywords: Activation mechanism; Cobalt metal-organic frameworks; Degradation; Dibutyl phthalate; Peroxymonosulfate