Radiation induced grafting of amphiphilic double poly(ionic liquid) copolymer onto silica surface for the removal of ReO4− as analogue of TcO4−

Amphiphilic double poly(imidazole ionic liquid) grafted silica (SMIL-n) was prepared by radiation grafting of hydrophilic 1-vinyl-3-ethylimidazolium bromide and hydrophobic 1-vinyl-3-octylimidazolium bromide at different ratio onto silica. The adsorption behavior of SMIL-n was investigated. The adsorption equilibrium could reach less than 45 min, and their adsorption capacity were 152–171 mg/g obtained from Langmuir model. The selectivity of SMIL-n to ReO4− increased with the increasing content of hydrophobic ionic liquid. SMIL-n displayed good reusability, excellent acid resistance and irradiation resistance. Particularly, SMIL-n showed promising for ReO4− uptake from simulated contaminated Beishan groundwater and radioactive wastewater.