Synthesis and Application of Block Copolymer Mesoporous Material SBA-15(SH)
Block copolymer mesoporous material SBA-15(SH) was synthesized through the cosolvent and grafted method.Nitrogen adsorption technique showed that highly ordered circle channels and large mesoporous size was 7.8 nm,surface area was 629 m2/g and pore volume was 1.32 cm3/g.Solid-state nuclear magnetic resonance spectra suggested that the thiol coverage of the monolayers was 65%.The optimal conditions and the adsorbing principle for the determination were studied.Under conditions of pH=7.5 and normal temperature,mercury,cadmium,lead,silver,chromium,copper,manganese and zinc etc could be adsorbed on the block copolymer mesoporous material SBA-15(SH),then eluted with 6 mol/L HCl+2 g/L thiourea and determined by atomic fluorescence and atomic absorption spectrometry.The adsorption capacities were Hg2+ 17.1 mg/g,Cd2+ 18.7 mg/g,Pb2+ 22.6 mg/g,Ag+ 12.7 mg/g,Cr3+ 9.7 mg/g,Cr6+ 10.8 mg/g,Cu2+ 10.8 mg/g,Mn2+ 19.2 mg/g,and Zn2+ 15.5 mg/g.The recoveries of those heavy metal ions were 96.4%-104.0%.The proposed method has been applied for the determination and treatment of heavy metal ions in environmental water with satisfactory results.