Enhancing the adsorption function of F- by iron and zirconium doped zeolite: Characterization and parameter optimization

This study presented an original on the F- removal by Fe and Zr doped Gismondine-dominated Zeolite. Various modified zeolites are prepared systematically adjusting synthesis variables, namely pH, mass ratio of zeolite to modify agent (mZeolite:m(Fe+Zr)), (Fe:Zr) investigate their effects adsorption. The performance Fe-Zr-Zeolite was examined through both statistic adsorption dynamic Results indicated that when pH 7, Fe:Zr 1:1 mZeolite:m(Fe+Zr) 1:2, natural which named showed best efficiency F-. could remove over 80% initial concentration less than 20 mg/L followed pseudo-second-order kinetic Langmuir isotherm, indicating chemically dominated. Besides, had better under acidic conditions alkaline conditions, competing anions, typically, Cl-, NO3- SO42- negligible effect Fe-Zr-Zeolite. test demonstrated in order maintain high F-, filling thickness should be at least 30 cm small flow rate is, higher will be.