摘要
持久性自由基(PFRs)因其具有较高的反应活性和持久性逐渐引起人们的关注。该研究以含PFRs的生物炭为载体成功制备生物炭-纳米零价铁(nZVI/BC)复合材料。n ZVI/BC通过活化H2O2可在短时间内去除溶液中95.6%的对硝基苯酚(PNP),相比生物炭(P500)和nZVI材料7.2%和76.9%的去除率,n ZVI/BC表现出更高的反应活性。同时考察了材料投加量、污染物浓度、H2O2浓度以及pH值等因素对PNP降解的影响,其中pH值是主要的影响因素。测定反应体系中羟基自由基(·OH)浓度变化和材料电化学性能后发现,含PFRs的nZVI/500材料表现出更好的电子交换能力,能促进体系中·OH的生成。该研究证明PFRs能强化nZVI/BC材料对H2O2的活化性能,提高溶液中活性氧浓度,为n ZVI/BC材料在降解污染物的应用上提供新思路。
Persistent free radicals(PFRs)have gradually attracted people’s attention because of their high reactivity and persistence.In this study,biochar containing PFRs was used as a carrier to successfully prepare biochar-nano-zero-valent iron(nZVI/BC)composite materials.nZVI/BC could remove 95.6%of p-nitrophenol(PNP)in the solution in a short time by activating H2O2.Compared with biochar(P500,7.2%)and nZVI materials 76.9%,nZVI/BC had higher reactivity.At the same time,the influence of factors such as material dosage,pollutant concentration,H2O2concentration and pH value on the degradation of PNP was investigated,among which pH value was the main influencing factor.After measuring the changes in the concentration of hydroxyl radicals(·OH)in the reaction system and the electrochemical properties of the materials,it was found that the nZVI/BC materials containing PFRs exhibit better electron exchange capacity and could promote the generation of·OH in the system.The study proved that PFRs can promote the activation of H2O2by nZVI/BC materials,increase the concentration of active oxygen in the solution,and then efficiently degrade pollutants,providing a new idea for nZVI/BC to degrade pollutants.
作者
李琋
李航
王兵
赵庆宇
刘丹妮
张凡
LI Xi;LI Hang;WANG Bing;ZHAO Qingyu;LIU Danni;ZHANG Fan(School of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China;Key Laboratory of Environmental Pollution Prevention on Oil and Gas Fields and Environmental Safety in Sichuan,Chengdu 610500,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第S01期35-40,共6页
Environmental Science & Technology
基金
油气田应用化学四川省重点实验室开放基金(YQKF202005)
作者简介
李琋(1987-),女,副研究员,博士,研究方向为环境污染修复、土壤环境化学,(电子信箱)lixi@swpu.edu.cn。
