Abstract
In order to recycle the industrial waste, silica fume of industrial waste was modified with r-mercaptopropyltrimethoxysilane coupling agent (KH590). The adsorption of modified silica fume on lead ions (Pb2+) was studied. The structures were characterized by FTIR and X-ray photoelectron spectroscopy (XPS). FTIR showed that the surface of silica fume was successfully grafted with KH590. XPS showed that the Pb2+ adsorbed on the surface of modified silica fume with coordination Pb-S bond. The effects of reaction time, Pb2+ initial concentration, pH value and adsorbent dosage on the adsorption rate were investigated. The results showed that silica fume modified by KH590 was an efficient lead ion adsorbent and the absorption rate of modified silica fume was up to 96.7%.
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