期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 166, 期 1, 页码 270-276出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2008.11.053
关键词
Silica; Radiation grafting; Adsorbent; Dimethylaminoethyl methacrylate; Cr(VI)
资金
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry
Silica-based adsorbent was prepared by radiation-induced grafting of dimethylaminoethyl methacrylate (DMAEMA) onto the silanized silica followed by a protonation process. The FTIR spectra and XPS analysis proved that DMAEMA was grafted successfully onto the silica Surface. The resultant adsorbent manifested a high ion exchange capacity (IEC) of ca. 1.30 mmol/g and the Cr(VI) adsorption behavior of the adsorbent was further investigated, revealing the recovery of Cr(VI) increased with the adsorbent feed and the equilibrium adsorption could be achieved within 40 min. The adsorption capacity, strongly depended on the pH of the solution, reached a maximum Cr(VI) uptake (ca. 68 mg/g) as the pH was in the range of 2.5-5.0. Furthermore, even in strong acidic (4.0 mol/L HNO3) or alkaline media (pH 11.0), the adsorbent had a sound Cr(VI) uptake capacity (ca. 22 and 30 mg/g, respectively), and the adsorption followed Langmuir mode. The results indicated that this adsorbent, prepared via a convenient approach, is applicable for removing heavy-metal-ion pollutants (e.g. Cr(VI)) from waste waters. (C) 2008 Elsevier B.V. All rights reserved.
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