Fe(II)/LXQ-10 bifunctional resin materials for boosting synergistic adsorption/oxidation of benzene in industrial waste gas

Abstract

Abstract A series of adsorption/oxidation bifunctional material with different Fe(II) loading amounts was prepared by using ultra-high crosslinking adsorption resin (LXQ-10) as a carrier and FeCl2 as an impregnating solution. The bifunctional material was characterized by BET, SEM, XRD, XPS, and EPR. The effects of Fe loading, reaction temperature, and space velocity on benzene adsorption efficiency were investigated using a self-made experimental equipment to explore the optimal reaction condition. The adsorption results were fitted and analyzed by using four typical models: quasi-first-order kinetic model, quasi-second-order kinetic model, Elovich kinetic model, and Weber and Morris kinetic model. The quasi-first-order kinetic model had the highest R2 value (0.998) and the best applicability. The fitting effect of the Freundlich equation (R2 = 0.997) was better than that of the Langmuir equation (R2 = 0.919). Furthermore, the effects of Fe loading, H2O2 concentration, benzene inlet concentration and temperature on the catalytic oxidation efficiency of benzene were also studied, and it was found that the catalytic oxidation efficiency of 3-Fe(II)/LXQ-10 can always be maintained at about 95% at a temperature of 303 K and an H2O2 concentration of 150 mmol/L. Compared with the adsorption efficiency, the catalytic oxidation efficiency of bifunctional resin materials in heterogeneous Fenton system was remarkably improved and had excellent stability. A possible migration and transformation path during benzene removal was proposed on the basis of the analysis results of gas chromatography–mass spectrometry (GC–MS) intermediates. This study provided a new process idea for the adsorption and oxidative degradation of VOCs.