Catalytic degradation of bisphenol A by modified coal gasification slag
It has a good application potential for coal gasification slag by modifying and regulating the physicochemical properties of it,which can be used to the catalytic removal of organic pollutants,especially electron rich organics.This study focuses on the catalytic application of coal gasification fine slag of space furnace for the removal of bisphenol A by activating persulfate(PMS).Specifically,the coal gasification slag was modified with various concentrations of acid(HCl),alkali(NaOH),and metal salt(ZnCl2)and used it in the BPA degradation process.The effect of modifier concentration on its catalytic performance was investigated.Besides,the performance of alkali modified coal gasification slag in the degradation of BPA by activating PMS under different reaction conditions was investigated with the active substances that play a dominant role in the catalytic degradation of BPA were further explored through XRF,XRD,SEM-EDS,FTIR,BET characterization and free radical quenching experiments.It was shown that all three modification methods can enhance the catalytic performance of coal gasification slag in degrading BPA,with NaOH modification shown the best performance.For the 5.5NaOH-FS/PMS system,15 mg/L BPA can be achieved complete removal within 60 minutes under the conditions of 30℃,catalyst dosage of 2 g/L,and PMS dosage of 10 mmol/L.XRF/XRD/SEM-EDS/FTIR analysis showed that the active Fe2 O3 component was retained in the structure of NaOH modified coal gasification slag,as well as the carbon content reached to 52.7%after NaOH modification.It promoted the BPA degradation.The free radical quenching experiment proved that·O-2 and 1 O2 were the main reactive oxygen species during the degradation of BPA by 5.5NaOH-FS/PMS.Moreover,the presence of carbon defects can directly participate in the oxidative degradation of BPA by forming intermediate complexes with PMS through non-free radical pathways.The research results provide a basis for the resource utilization of coal gasification slag,especially for its application as a catalyst in the field of organic pollutant removal.
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