Degradation of 2,4-dichlorophenol by single atom Mn-N-C catalyst activated peroxymonosulfate
Aiming at the harm of 2,4-Dichlorophenol(2,4-DCP)to environmental pollution,it is urgent to develop a clean and efficient treatment method.Study synthesized a Mn-single atom catalyst(Mn-N-C)anchored on nitrogen doped carbon substrate by template etching method.Mn atoms were uniformly stabilized on the support in the form of Mn-Nx,which enhanced the polarization and electron transfer of Mn-N-C.When the addition of Mn-N-C and PMS were 50 mg/L and 0.8 mmol/L respectively,the degradation rate of 2,4-DCP was 99.6％within 60 min at the temperature of 25 ℃ and pH of 7.0,and the pseudo-first-order reaction rate constant kobs=0.078 6 m in-1.Through analysis and calculation,Mn—Nx and N—(C)3 structures in Mn-N-C activated PMS to produce 1 O2 and·O-,then 2,4-DCP was mainly degraded by 1 O2 via three dominant pathways,namely hydroxylation,dechlorination and ring-opening reaction,which significantly reduced the toxicity of the degradation products.The experimental results indicated that Mn-N-C shows excellent catalytic activity in activating PMS to degrade 2,4-DCP;Mn-N-C/PMS system has certain anti-interference ability,excellent stability and reusability,which provides an effective method for the treatment of 2,4-DCP in real wastewaters.
single atom catalystperoxymonosulfatesinglet oxygen2,4-dichlorophenoldegradation
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