零价铁活化过硫酸盐降解土壤中邻苯二甲酸酯  

Degradation of Phthalates in Soil by Zero-valent Iron Activated Persulfate

作　　者：李海峰[1,2] 刘河疆 郭文博 苏含明 刘志刚 马兴旺[2,4] 刘国宏 LI Haifeng;LIU Hejiang;GUO Wenbo;SU Hanming;LIU Zhigang;MA Xingwang;LIU Guohong(Turpan Institute of Agricultural Sciences,Xinjiang Academy of Agricultural Sciences,Turpan 838000,China;Key Laboratory of Agro-environment in Northwest Oasis,Ministry of Agriculture and Rural Affairs,Urumqi 830091,China;Institute of Agricultural Quality Standards and Testing Technology Research,Xinjiang Academy of Agricultural Sciences,Urumqi 830091,China;Institute of Soil,Fertilizer and Agricultural Water Conservation,Xinjiang Academy of Agricultural Sciences,Urumqi 830091,China)

机构地区：[1]新疆农业科学院吐鲁番农业科学研究所,新疆吐鲁番838000 [2]农业农村部西北绿洲农业环境重点实验室,新疆乌鲁木齐830091 [3]新疆农业科学院农业质量标准与检测技术研究所,新疆乌鲁木齐830091 [4]新疆农业科学院土壤肥料与农业节水研究所,新疆乌鲁木齐830091

出　　处：《环境科学与技术》2024年第7期156-165,共10页Environmental Science & Technology

基　　金：农业农村部西北绿洲农业环境重点实验室开放基金课题(XBLZ-20213);新疆维吾尔自治区“天山英才”培养计划(2022TSYCJC0053)。

摘　　要：为了探究零价铁(ZVI)活化过硫酸盐(PS)对土壤邻苯二甲酸二(2-乙基己基)酯(DEHP)的降解效率、最优降解条件及对土壤性质的影响,该文通过单因素实验和正交实验,研究初始pH值、水土比、PS浓度、ZVI添加量、反应时间对DEHP降解效率的影响,同时探讨了氧化体系对土壤理化性质和速效养分的影响。结果表明,5个因素对DEHP降解率的影响程度依次为PS>初始pH>ZVI添加量>水土比>反应时间。当初始pH为3、水土比4∶1、PS浓度为1 mmol/g、ZVI添加量为0.5 mmol/g、反应80 min时DEHP降解率在75.12%~80%之间,降解效果最佳。ZVI/PS氧化体系对土壤性质影响较大,随着PS浓度增加,土壤pH、土壤有机质含量呈现不同程度的降低,土壤电导率和氧化还原电位呈递增趋势。当同时加入PS和ZVI时,速效氮含量显著增大;单独向土壤溶液中添加ZVI或PS均使土壤速效磷含量显著增高,当土壤溶液中同时添加PS和ZVI后,速效磷含量急剧下降;而当ZVI或PS的浓度比≥1时,速效钾含量急剧下降,降幅达到76%。在实际修复PAEs污染土壤时要充分评估氧化剂添加量对土壤性质的影响,该研究可为ZVI活化PS去除土壤环境介质中的DEHP提供了理论和实践依据。To explore the degradation efficiency,optimal degradation conditions and soil properties of di(2-ethylhexyl)phthalate(DEHP)by zero-valent iron(ZVI)-activated persulfate(PS),the effects of initial pH value,soil soil ratio,PS concentration,ZVI addition amount and reaction time on DEHP degradation efficiency were studied by single factor and orthogonal experiments.The effects of oxidation system on soil physicochemical properties and available nutrients were also discussed.The results showed that the influence degree of five factors on DEHP degradation rate was PS>initial pH>ZVI addition amount>soil and water ratio>reaction time.When the initial pH was 3,water/soil ratio 4∶1,PS concentration was 1 mmol/g,ZVI dosage was 0.5 mmol/g and reaction time was 80 min,DEHP degradation rate was in the range of 75.12%~80%,the degradation effect was best.ZVI/PS oxidation system had a great influence on soil properties.With the increase of PS concentration,soil pH and soil organic matter content showed different degrees of decrease,and soil electrical conductivity and REDOX potential showed an increasing trend.When PS and ZVI were added at the same time,the available nitrogen content increased significantly.Adding ZVI or PS to soil solution alone significantly increased the content of available phosphorus,but when adding PS and ZVI to soil solution at the same time,the content of available phosphorus decreased sharply.When the concentration ratio of ZVI or PS was greater than or equal to 1,the content of available potassium decreases sharply,by 76%.The effect of oxidant addition on soil properties should be fully evaluated in the actual remediation of PAEs contaminated soil.This study can provide theoretical and practical basis for the removal of DEHP in soil environmental media by ZVI-activated PS.

关 键 词：零价铁 过硫酸盐 土壤 邻苯二甲酸二(2-乙基己基)酯 降解效率 

分 类 号：X703[环境科学与工程—环境工程]