人工仿真菱铁矿及其衍生材料催化修复PAHs污染土壤  

Catalytic remediation of polycyclic aromatic hydrocarbons contaminated soil by synthetic siderite and its derivatives

作　　者：杨昕 钟承韡 杨志山[1,3] 朱韦韦 王文浩 余江[1,2,3] YANG Xin;ZHONG Chengwei;YANG Zhishan;ZHU Weiwei;WANG Wenhao;YU Jiang(College of Architecture and Environment,Sichuan University,Chengdu 610065,Sichuan,China;Institute of New Energy and Low Carbon Technology,Sichuan University,Chengdu 610065,Sichuan,China;Yibin Institute of Industrial Technology,Sichuan University,Yibin 644000,Sichuan,China)

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]四川大学新能源与低碳技术研究院,四川成都610065 [3]四川大学宜宾产业技术研究院,四川宜宾644000

出　　处：《化工进展》2024年第7期4118-4127,共10页Chemical Industry and Engineering Progress

基　　金：国家重点研发计划(2018YFC1802605);四川省区域创新项目(2022YFQ0081);成都市科技局重点研发支撑计划(2022-YF05-00357-SN)。

摘　　要：为考察不同氧化体系及运行参数对土壤多环芳烃降解性能的影响,本文通过人工仿真合成菱铁矿(SFC)并进一步引入纳米零价铁(nZVI)制备改性菱铁矿(FFC),催化氧化修复实际多环芳烃(PAHs)污染场地土壤。实验结果表明,SFC和FFC催化过硫酸钠(PDS)体系均能有效降解PAHs。通过优化运行参数包括降低初始pH、提高土水比和延长反应时间等可进一步提高土壤PAHs降解率。而等价处理实验结果显示,采用H_(2)O_(2)等价代替PDS虽可以降低治理成本,但PAHs降解率却有所下降。同时,土壤毒性评估结果发现经SFC/PDS和FFC/PDS处理后的黑麦草种子发芽率得到显著提高。本研究表明SFC和FFC催化体系可有效修复PAHs污染土壤,并缓减土壤生态毒性。To investigate the effects of different oxidation systems and operating parameters on the degradation performance of soil PAHs,synthetic siderite(SFC)was artificially simulated and modified siderite(FFC)was obtained by introducing nZVI with excellent performance to catalyze the oxidative degradation of PAHs in actual contaminated site soil.The results showed that both SFC and FFCcatalyzed PDS systems were effective in degrading PAHs,and the soil PAHs degradation rate was further improved by optimizing the operating parameters,including lowering the initial pH,increasing the soil-towater ratio and extending the reaction time.In addition,the use of H_(2)O_(2)equivalent instead of PDS could reduce the treatment cost,but the degradation rate was slightly decreased.The results of soil toxicity assessment showed that the germination rate of ryegrass seeds was significantly increased after SFC/PDS and FFC/PDS treatments.The study indicated that SFC and FFC catalytic systems could effectively remediate PAHs-contaminated soil and reduce soil ecotoxicity.

关 键 词：菱铁矿 多环芳烃 催化 污染场地 原位化学氧化 

分 类 号：X53[环境科学与工程—环境工程]