Nitrogen doped carbon nanosheet derived from waste PVC plastic activated peroxymonosulfate for tetracycline removal
In this work,nitrogen doped carbon nanosheet catalyst was synthesized via a thermal treatment method by employing waste polyvinyl chloride(PVC)plastic as carbon source and melamine as nitrogen source.The performance of tetracycline(TC)removal from water by the catalyst activated peroxymonosulfate(PMS)was evaluated.The effects of the operational parameters including PMS concentration,catalyst dosage,pH and different inorganic ions on TC degradation were studied.The results of various characterizations revealed that the prepared catalyst had a thin nanosheet structure and consisted of carbon,nitrogen and oxygen elements.Moreover,the catalyst displayed an excellent PMS activation ability for TC degradation.The optimum TC removal happened at the catalyst dosage of 0.1 g·L-1 and PMS content of 1 mmol·L-1,98％of TC could be removed after 30 min reaction.As confirmed by results of the radical trapping experiments and EPR tests,the formed singlet oxygen and superoxide radicals played a vital role during TC degradation by catalyst/PMS.The result of cycling tests revealed that the catalyst had a relatively robust stability.This work paves the way for the rational design of a novel carbon-based catalytic system with high-efficiency PMS activation and application in the field of environmental pollution control.
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