摘要
为了解决纳米零价铁(nZVI)pH应用范围窄和玉米芯资源化的问题,研究采用玉米芯水热碳化制备生物炭(BC)作为载体改性nZVI,通过液相还原法合成了BC@nZVI复合阴极材料,构建了BC@nZVI非均相电芬顿体系。通过对BC@nZVI复合阴极材料SEM、IR、XPS、XRD等表征分析得出,生物炭上有纳米零价铁的附存,且均匀分布,不易团聚。实验研究发现:溶液pH=3、电流密度为200 mA、Fe/C(质量比)为2∶1、板间距为3 cm时,BC@nZVI非均相电芬顿体系对活性红X-3B去除效果最佳,去除率为97.73%,且在pH范围为3~5时,去除效率均在95%以上,在pH为6~7时有72%以上的去除效率,pH=9时,去除效率为63.79%。阴极材料的重复实验表明BC@nZVI复合阴极材料重复利用5次后依旧有90%以上的去除率,可循环性较好。通过非均相电芬顿体系对活性红X-3B降解实验研究发现,体系在运行过程中原位产生H_(2)O_(2),浓度最高达281μmol/L,且降解过程符合二级动力学模型,其动力学常数为0.0023 L/(mg·min)。
To address the limitations of the narrow pH application range of nanoscale zero-valent iron(nZVI)and to enhance the resource utilization of corn cob,this study employed hydrothermal carbonization of corn cob to produce biochar(BC)as a carrier for nZVI modification.BC@nZVI composite cathode materials were synthesized via liquid-phase reduction and a heterogeneous electro-Fenton system was established utilizing these BC@nZVI composite cathode materials.Through SEM,IR,XPS and XRD characterization of BC@nZVI composite cathode material,it was found that there were nano zero-valent iron attached to biochar,which was uniformly distributed and not easy to agglomerate.Experimental results indicated that the BC@nZVI heterogeneous electro-Fenton system exhibited optimal performance for removing reactive red X-3B at a solution pH of 3,with a current density set at 200 mA,a Fe/C mass ratio of 2∶1,and an inter-electrode distance of 3 cm,achieving a removal rate of 97.73%.The removal efficiency remained above 95% within the pH range of 3-5,exceeded 72% between pH values of 6-7,and reached 63.79% at pH=9.Repeated experiments demonstrated that after five cycles of reuse,the BC@nZVI composite cathode materials maintained over 90% removal efficiency,indicating excellent recyclability.Through the experimental study on the degradation of reactive red X-3B by the heterogeneous electro-Fenton system,it was found that H_(2)O_(2)was generated in situ during the operation of the system,with the highest concentration reaching 281μmol/L,and the degradation process conformed to the second-order kinetic model,with its kinetic constant being 0.0023 L/(mg·min).
作者
凌晓慧
程文文
陈洋洋
李伟
魏超
张赟
王毅博
LING Xiaohui;CHENG Wenwen;CHEN Yangyang;LI Wei;WEI Chao;ZHANG Yun;WANG Yibo(School of Environment and Chemical Engineering,Xi’an Polytechnic University,Xi’an 710048,China;ChinaNational Chemical Urban Investment Co.,Ltd.,Xi’an 710048,China)
出处
《功能材料》
北大核心
2025年第9期9066-9073,共8页
Journal of Functional Materials
基金
陕西省科技厅自然科学基金项目(2025JC-YBMS-599)
西安市科技局高校院所人才服务企业项目(23GXFW0026)
中化学城市投资有限公司科研项目(2023KJ-020)。
