Zhijian Liu , Siqi Zhong , Xiaoyue Zhang , Ke Tian , Taiping Qing , Xiaoqing Liu
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引用次数: 0
Abstract
The development of efficient and practical catalysts has garnered significant attention in advanced oxidation systems. In this work, a carbon nitride supported single-atom cobalt catalyst (Co-NC) was synthesized using carbon black as the precursor for the carbon carrier through a co-pyrolysis method. This catalyst was then utilized to activate peroxymonosulfate (PMS) and degrade p-nitrophenol (PNP). Through experimental investigation, it was found that the optimal conditions for synthesizing the Co-NC catalyst, which exhibited the best catalytic performance, involved setting the cobalt acetate tetrahydrate to carbon black ratio at 0.4 mol/g, the cobalt acetate tetrahydrate to 1,10-phenanthroline ratio at 1:3, and the pyrolysis temperature at 650 °C. With a cobalt content of only 0.4 wt%, the catalyst exhibits a specific surface area of 372.6 m2/g and an optimal defect degree of 1.04. Under the catalytic action driven by singlet oxygen-identified as the primary active species via EPR-the degradation rate of PNP reaches 95 % within 30 min. The high catalytic activity of Co-NC catalyst derived from its unique CoN coordination and bond length. Notably, the concentration of Co ions leaching in the reaction solution remains below 0.05 mg/L. Additionally, experimental evidence confirms its applicability across diverse water qualities. This study presented a new single-atom catalyst with excellent PMS activation and provided valuable insights into the rational design of catalysts with low metal ion leaching.
期刊介绍:
The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies