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چکیده
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Cr (VI) considered as one of the toxic heavy metals, which can cause damage to the human health, like lung cancer, liver, kidney and gastric damage [1]. For this reason varios treatments have been studied. Adsorption is a common treatment applied to remove Cr (VI) [2]. A large number of adsorbents have been utilized in Cr (VI) removal, including activated carbon, chitosan, nanoscale zero-valent iron, magnetic nanocomposite, ion-imprinting technique and other substances [3-5]. In this study, chromium (VI) ion-imprinted polymer (Cr(VI)-IIP) was prepared using surface ion imprinting technique on graphene oxidemesoporous silica (GO-MS) nano sheets with 3-(2-amino ethyl amino) propyl trimethoxysilane. Absorbent nanosheets produced were characterized by Fourier transform infrared spectroscopy (FT_IR), scanning electron microscopy (SEM), X-ray diffraction (EDAX), and thermal balance analysis (TGA) techniques. The influences of pH of aqueous sample, adsorbent amount, number of sample loading cycles, number of solvent loading cycles, sample volume, solvent volume on the adsorption performance of Cr(VI)-IIP were investigated. The method has a linear range of 100-1400 ppb and detection limit (LOD) of 4.88 ppb. In the selectivity study, it was found that the synthesized adsorbent shows high efficiency in adsorption of chromium (VI) ions in competition with other metal anions and cations.
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