Removal As(V) by sulfated mesoporous Fe–Al bimetallic adsorbent: Adsorption performance and uptake mechanism

摘要: Abstract Sulfated mesoporous Fe–Al bimetallic adsorbent, prepared by a simple method of incipient-wetness impregnation, was employed as an efficient adsorbent to remove As(V) from solution. Removal performance investigated batch experiments with various factors, including ferric content, inorganic additive, contact time, initial pH and dosage. An interesting result obtained that demonstrated anions additive have significant influence on removal, the sample 10 wt% Fe2(SO4)3 found be highly effective adsorbent. The experiment data were excellent fitted Langmuir isotherm maximum monolayer uptake about 98.13 mg/g at near neutral. And solution negligible removal in region 2.5–11.0. More importantly, adsorption equilibrium can attained within 3 h, which is significantly shorter than MA (more 12 h). Based results experiments, changes, energy, XPS analyses chemical forms As(V), possible mechanisms under conditions proposed follows: (1) during below 4, H2AsO4− H3AsO4 adsorbed electrostatic interaction hydrogen bond, respectively; (2) higher exchange between sulfate group dominantly interaction.