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

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.