title: Speciation, adsorption and determination of chromium(III) and chromium(VI) on a mesoporous surface imprinted polymer adsorbent by combining inductively coupled plasma atomic emission spectrometry and UV spectrophotometry.
abstract: In the present study, a Cr(III)-imprinted polymer (Cr(III)-IIP) was prepared by an easy one-step sol-gel reaction with a surface imprinting technique on the support of silica mesoporous material. A new SPE method for the speciation, separation, preconcentration, and determination of Cr(III) and Cr(VI) by inductively coupled plasma atomic emission spectrometry and UV on the mesoporous-imprinted polymer adsorbent was developed. The structure of the imprinted polymer was characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, transmission electron microscopy, and nitrogen adsorption-desorption isotherms. The adsorption kinetics, thermodynamics behavior, and recognition ability toward Cr(III) on Cr(III)-IIP and nonimprinted polymer were compared. The results showed that Cr(III)-IIP had higher selectivity and nearly a two times larger Langmuir adsorption capacity (38.50 mg/g) than that of NIP. The proposed method has been successfully applied in the determination and speciation of chromium in natural water samples with satisfactory results.
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Xiangguo
authors.initials: X
authors.lastname: Meng
authors.forename: Juan
authors.initials: J
authors.lastname: Han
authors.forename: Zhanchao
authors.initials: Z
authors.lastname: Liu
authors.forename: Minjia
authors.initials: M
authors.lastname: Meng
authors.forename: Yun
authors.initials: Y
authors.lastname: Wang
authors.forename: Rui
authors.initials: R
authors.lastname: Chen
authors.forename: Sujun
authors.initials: S
authors.lastname: Tian
keywords: Chromium; Mesoporous materials; Molecularly imprinted polymers; Selectivity; Speciation