Cr(VI) ADSORPTION ON MERCAPTOPROPYL- FUNCTIONALIZED HALLOYSITE NANOTUBES

摘要

The natural halloysite nanotubes (HNTs) were modified with y-mercaptopropyltrimethoxy silane (KH-590) to form a new adsorbent. The as-prepared adsorbent was characterized by FTIR spectra, thermogravimetric analysis and transmission electron microscopy. The results showed that mercaptopropyl was grafted successfully onto the nanotube surface. While the modified HNTs were used as adsorbent for Cr(VI) removal from its aqueous solution, kinetic studies showed that the rate of adsorption of Cr(VI) obeyed a pseudo-second-order kinetic model. And the adsorption data of Cr(VI) on the modified HNTs are well consistent with Langmuir model, and the maximum adsorption capacity of 2.79 mg/g can be deduced from the model.