Thiohydroxy-functionalized Mesoporous Materials: Preparation and its Adsorption to Cr6

Chromium ion accumulation in environment is a health hazard to human being.A thiohydroxy-functionalized mesoporous material SBA-15-SH as adsorbent was prepared by the hydrothermal polycondensation method in this study.When 3-mercaptopropyltrimethoxysilane was used as the silicon source,SBA-15 was successfully modified with the thiohydroxy group confirmed by FTIR.This designed mesoporous material was rod-like with regular and well-defined channel systems of 7 nm.The adsorption capacity of SBA-15-SH to Cr6+ was affected by the adsorption temperature,Cr6+ solution pH and its initial concentration together with the adsorbent dosage.The adsorption equilibrium was reached in 10 min which obeyed the Langmuir adsorption equation and the pseudo second-order kinetic mode.The maximum adsorption capacity of SBA-15-SH to Cr6+ was 6.85 mg/g when the Cr6+ solution pH and adsorption temperature was controlled at 4.0 and 25–45 ℃,respectively.This functionalized mesoporous material was successfully applied in spiked tap-water