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SrCo1-xTixO3-? perovskites as excellent catalysts for fast degradation of water contaminants in neutral and alkaline solutions.

ABSTRACT: Perovskite-like oxides SrCo1-xTixO3-? (SCTx, x?=?0.1, 0.2, 0.4, 0.6) were used as heterogeneous catalysts to activate peroxymonosulfate (PMS) for phenol degradation under a wide pH range, exhibiting more rapid phenol oxidation than Co3O4 and TiO2. The SCT0.4/PMS system produced a high activity at increased initial pH, achieving optimized performance at pH???7 in terms of total organic carbon removal, the minimum Co leaching and good catalytic stability. Kinetic studies showed that the phenol oxidation kinetics on SCT0.4/PMS system followed the pseudo-zero order kinetics and the rate on SCT0.4/PMS system decreased with increasing initial phenol concentration, decreased PMS amount, catalyst loading and solution temperature. Quenching tests using ethanol and tert-butyl alcohol demonstrated sulfate and hydroxyl radicals for phenol oxidation. This investigation suggested promising heterogeneous catalysts for organic oxidation with PMS, showing a breakthrough in the barriers of metal leaching, acidic pH, and low efficiency of heterogeneous catalysis.

SUBMITTER: Miao J 

PROVIDER: S-EPMC5345050 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

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SrCo<sub>1-x</sub>Ti<sub>x</sub>O<sub>3-δ</sub> perovskites as excellent catalysts for fast degradation of water contaminants in neutral and alkaline solutions.

Miao Jie J   Sunarso Jaka J   Su Chao C   Zhou Wei W   Wang Shaobin S   Shao Zongping Z  

Scientific reports 20170310

Perovskite-like oxides SrCo<sub>1-x</sub>Ti<sub>x</sub>O<sub>3-δ</sub> (SCT<sub>x</sub>, x = 0.1, 0.2, 0.4, 0.6) were used as heterogeneous catalysts to activate peroxymonosulfate (PMS) for phenol degradation under a wide pH range, exhibiting more rapid phenol oxidation than Co<sub>3</sub>O<sub>4</sub> and TiO<sub>2</sub>. The SCT<sub>0.4</sub>/PMS system produced a high activity at increased initial pH, achieving optimized performance at pH ≥ 7 in terms of total organic carbon removal, the mini  ...[more]

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