梧桐叶提取液介导合成铁基纳米材料活化过硫酸盐降解土壤中的四溴双酚A

IRON-BASED NANOMATERIALS MEDIATED BY LEAF EXTRACTS FROM SYCAMORE ACTIVATE PERSULFATES TO CATALYZE TBBPA DEGRADATION IN SOIL

四溴双酚A(TBBPA)降解是环境污染治理领域的研究热点。利用梧桐叶提取液介导合成的铁基纳米材料(T-Fe NPs)催化活化过硫酸盐(PS)降解土壤中TBBPA,优化了不同类型土壤(潮土、红壤、黄棕壤)对TBBPA的降解条件。采用Box-Behnken Design模型,分析不同因素(T-Fe NPs投加量、PS浓度、温度)及其交互作用对土壤TBBPA降解率的影响,得出不同土壤中TBBPA最佳降解条件。结果表明:1)T-Fe NPs能有效活化PS降解不同类型土壤中TBBPA,在红壤中降解效果较好。2)不同类型土壤中TBBPA的最佳降解条件存在差异,潮土中最优条件为:T-Fe NPs投加量6.39 g/kg,PS浓度31.26 mmol/L,温度20.73℃,降解率可达到71.72%;红壤中最佳条件为:T-Fe NPs投加量5.26 g/kg,PS浓度29.08 mmol/L,温度为49.80℃,降解率可达到87.87%;黄棕壤中最佳条件为:T-Fe NPs投加量3.42 g/kg,PS浓度15.77 mmol/L,温度11.83℃,降解率可达到54.22%。该研究结果可为TBBPA污染土壤工程修复提供理论依据。

The degradation of tetrabromobisphenol A(TBBPA)is a research hotspot in the field of environmental pollution control.In this study,the degradation of TBBPA in soil was catalyzed by persulfate(PS)activated by the iron-based nanomaterials(T-Fe NPs)mediated by leaf extracts from sycamore,and the degradation conditions of TBBPA in different soil types(aquic soil,red soil,yellow-brown soil)were optimized.Box-Behnken design model was used to analyze the effects of different factors(T-Fe NPs dosage,PS concentration,temperature)and their interaction on soil TBBPA degradation rate,and the optimal degradation conditions of TBBPA in different soils were obtained.The results showed that:1)T-Fe NPs could effectively activate PS and degrade TBBPA in different types of soil,and the degradation effect was better in red soil.2)The optimal degradation conditions of TBBPA in different types of soil were different.In aquic soil,the T-Fe NPs dosage was 6.39 g/kg,PS concentration was 31.26 mmol/L,the temperature was 20.73℃,and the degradation rate was 71.72%.In red soil,T-Fe NPs dosage was 5.26 g/kg,PS concentration was 29.08 mmol/L,the temperature was 49.80℃,and degradation rate was 87.87%.In yellow-brown soil,T-Fe NPs dosage was 3.42 g/kg,PS concentration was 15.77 mmol/L,the temperature was 11.83℃,and the degradation rate was 54.22%.This method can provide a theoretical basis for TBBPA contaminated soil remediation.