Highly efficient degradation of salicylic acid by the Fe-PG UV-assisted activation of H2O2 fluidized bed
Aiming at the difficulty of catalyst recovery in conventional photocatalytic technology and serious residual H2O2 pollution in ultraviolet/hydrogen peroxide(UV/H2O2)technology,iron-loaded porous foamed glass(Fe-PG)was prepared by an impregnation method,and it was used in the ultraviolet light-assisted activation of H2O2 fluidized bed to degrade salicylic acid(SA).The results show that under the same experimental conditions,the SA degradation rate,mineralization rate and H2O2 utilization rate by Fe-PG UV-assisted activation of H2O2(UV/H2O2/Fe-PG)fluidized bed process were significantly better than UV/H2O2.Taking operating costs into consideration,the optimal hydraulic residence time(HRT)was 40 min,the optimal H2O2 dosage was 3 mmol·L-1,and the optimal Fe-PG expansion rate was 30％.UV/H2O2/Fe-PG fluidized bed process had a strong tolerance to the initial concentration,pH and salt ions of SA solution.After 30 days of continuous operation,the degradation rate of SA remained above 98％,and the mineralization rate was still as high as 78.1％.The main active substances for the degradation of SA by the UV/H2O2/Fe-PG fluidized bed process were·OH,O2·-and h+,and the degradation process conformed to the first-order kinetics.The research results provide a technical support for the engineering application of photocatalytic-assisted activation of H2O2 fluidized bed technology.
Fe-PGphotocatalytic fluidized bedsalicylic acidactive species
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