摘要
为解决染料废水产量大、毒性高,危害人体健康与生态系统的问题,以农业废物玉米芯为原材料,基于“变废为宝”的技术思路,合成了掺铁富磁生物炭(Fe-CCBC),研究其活化过氧单硫酸盐(PMS)降解罗丹明B(Rh B)的效能和机制,并利用多种表征手段分析Fe-CCBC的理化特性。结果表明:800℃制备的掺铁富磁生物炭(Fe-CCBC-800)具有丰富的孔隙结构和活性位点,可最大程度地保证Fe颗粒在催化剂表面的均匀分布,物化性能优异且催化活性较高。Fe-CCBC-800/PMS体系在40 min内对Rh B的降解率可达91%,且富磁的生物炭更易于回收和重复利用,在5次循环使用中均保持着良好的催化效果。通过活性氧淬灭实验和电子顺磁共振测试探明了Fe-CCBC-800/PMS体系中主要活性氧物种为SO_(4)^(-)·和·OH,Fe^(2+)作为氧化还原反应的电子供体,参与PMS的活化过程,促进活性氧的产生和Rh B的高效降解。Fe-CCBC-800/PMS体系可实现对Rh B的高效处理,为农业废物的利用以及染料污染物的快速降解提供了可行路径。
In order to solve the problem of large production and high toxicity of dye wastewater,which endangers human health and the ecosystem,iron-doped magnet-rich biochar(Fe-CCBC)was synthesized using corn cobs from agricultural waste as raw materials based on the technical idea of"turning waste into treasure".The efficacy and mechanism of Fe-CCBC-activated peroxymonosulfate(PMS)in the degradation of rhodamine B(Rh B)was studied.The physicochemical properties of Fe-CCBC were analyzed by various characterization methods.The results showed that Fe-CCBC-800 prepared at 800℃ had abundant pore structure and active sites,which could ensure the uniform distribution of Fe particles on the catalyst surface to the greatest extent,and it had excellent physicochemical properties and high catalytic activity.The Fe-CCBC-800/PMS system could remove Rh B up to 91% within 40 min.Moreover,the magnet-rich biochar was easier to recycle and reuse,and maintained a good catalytic effect in 5 cycles.The main reactive oxygen species in the Fe-CCBC-800/PMS system were SO_(4)^(-)·and·OH,which were detected by reactive oxygen species quenching experiment and electron paramagnetic resonance(EPR)test.Fe^(2+),as an electron donor for redox reactions,participated in the activation process of PMS,and promoted the production of reactive oxygen species and the efficient degradation of Rh B.The Fe-CCBC-800/PMS system can realize the efficient treatment of Rh B,which provides a viable pathway for the utilization of agricultural waste and the rapid removal of dye contaminants.
作者
王晨
张新怡
郭壮
魏健
刘利
宋永会
WANG Chen;ZHANG Xinyi;GUO Zhuang;WEI Jian;LIU Li;SONG Yonghui(State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences;Institute of Water Eco-environment Research,Chinese Research Academy of Environmental Sciences;School of Environment,Liaoning University)
出处
《环境工程技术学报》
北大核心
2025年第3期924-934,共11页
Journal of Environmental Engineering Technology
基金
国家重点研发计划项目(2021YFC3201500)。
