钴掺杂二氧化锰类氧化物酶降解亚甲基蓝的研究  

Degradation of Cobalt-doped Manganese Dioxide(Co-MnO_(2))-like Oxidative Enzymes of Methylene Blue

作　　者：韦敏 刘士华[3] 王榕 WEI Min;LIU Shihua;WANG Rong(School of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Ocean Oil Extraction Plant,Shengli Oilfield Branch of China Petroleum and Chemical Corporation,Dongying 257237,China;Heze Municipal Ecological and Environmental Affairs Centre,Heze 274600,China;Soil Pollution Prevention and Control Centre of Shandong Province,Jinan 250101,China)

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]中国石化胜利油田分公司海洋采油厂,山东东营257237 [3]山东省菏泽市生态环境事务中心,山东菏泽274600 [4]山东省土壤污染防治中心,山东济南250101

出　　处：《环境科学与技术》2024年第9期35-44,共10页Environmental Science & Technology

摘　　要：纳米酶作为一种新兴的催化氧化剂,因其低成本、低消耗在水处理领域受到广泛关注。通过掺杂过渡金属能有效提高纳米酶的活性,促进MnO_(2)基材料降解有机污染物的性能。该研究采用一步水热法,将Co元素掺杂到MnO_(2)表面,形成高活性类氧化物酶。使用X射线光电子能谱、扫描电镜和X射线衍射等手段,对Co-MnO_(2)的形貌和化学成分进行分析,并深入探讨了其对亚甲基蓝的降解性能。结果表明,Co元素的掺杂增强了Co-MnO_(2)的类氧化物酶活性;亚甲基蓝浓度为20 mg/L、Co-MnO_(2)用量在0.5 g/L时,在60~90 min可降解90%以上的亚甲基蓝,同时,Co-MnO_(2)表现出优异的抵御环境干扰的能力;自由基捕获实验和电子顺磁共振分析表明,Co-MnO_(2)纳米酶能高效利用溶解氧产生1O_(2)和O_(2)^(·-)加速降解亚甲基蓝。此研究可为纳米酶降解有机污染物提供新依据。Nanozymes,as an emerging catalytic oxidant,have garnered widespread attention in the fields of water treatment due to their low cost and consumption.The introduction of transition metals into nanozymes effectively boosts their catalytic activity,promoting the degradation of organic pollutants by manganese-based materials.In this study,a one-step hydrothermal method was employed to effectively dope Co elements onto the surface of MnO_(2),forming highly active nanostructured oxides.The morphology and chemical composition of Co-MnO_(2)were analyzed by characterization techniques such as X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),and X-ray diffraction(XRD),and further investigation was conducted on its degradation performance towards organic pollutants(methylene blue).The results indicate that the doping of Co enhances the activity of Co-MnO_(2)nanozymes.At a methylene blue concentration of 20 mg/L and a Co-MnO_(2)dosage of 0.5 g/L,the degradation efficiency of methylene blue reached over 90%within 60~90 minutes.Additionally,Co-MnO_(2)exhibited excellent resistance to environmental interference.Free radical capture experiments and Electron Paramagnetic Resonance(EPR)analysis also demonstrated that Co-MnO_(2)nanozymes efficiently utilize dissolved oxygen to produce large amounts of 1O_(2)and O_(2)^(·-)species for the rapid degradation of methylene blue.This study provides new insights into the degradation of organic pollutants by nanozymes.

关 键 词：类氧化物酶 钴掺杂 Co-MnO_(2) 亚甲基蓝 

分 类 号：X52[环境科学与工程—环境工程]