Citation: LI Ting, LIU Shu, CAI Jing, LIN Miao. Preparation and Adsorption Properties of Bipyridyl Functionalized Chromium(Ⅲ) Imprinted Mesoporous Silica Material[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(11): 1836-1844. doi: 10.11895/j.issn.0253-3820.181341 shu

Preparation and Adsorption Properties of Bipyridyl Functionalized Chromium(Ⅲ) Imprinted Mesoporous Silica Material

LI Ting ^1, ,
LIU Shu ² ,
CAI Jing ² ,
LIN Miao ¹

¹ College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China;
² Technical Center for Industrial Product and Raw Material Inspection and Testing, Shanghai Entry-Exit Inspection and Quarantine Bureau, Shanghai 200135, China

Received Date: 29 June 2018
Revised Date: 15 August 2018

Fund Project: This work was supported by the General Administration of Quality Supervision, Inspection and Quarantine of China (Nos. 2017IK160, 2015IK217)

A novel chromium (Ⅲ) ion-imprinted material (Cr(Ⅲ)-ⅡPs) was prepared by the surface imprinted technique with Cr(Ⅲ) ion as the template, di(2-pyridyl)methanol as functional monomer, 3-(triethoxysilyl)-propyl-iodine as cross-linking agent and mesoporous silica MCM-41 as solid supports. The structure and morphology of Cr(Ⅲ)-ⅡPs and NIP were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance, small angle X-ray diffraction, scanning electron microscopy, transmission electron microscope and N₂ adsorption-desorption analysis. The BET test results showed that the specific surface area (625.3 m²/g) of Cr(Ⅲ)-ⅡPs was greater than that of NIP (527.1 m²/g). When the temperature was 25℃, pH=5 and the adsorption time was 30 min, the adsorption of Cr³⁺ ions on the imprinted material reached an equilibrium and the adsorption capacity was 151.2 mg/g. The isothermal adsorption model and adsorption kinetics study showed that the adsorption isotherm model conformed to Langmuir model. The model had a correlation coefficient of 0.9929. The adsorption kinetics followed the pseudo-second-order model and the correlation coefficient was 0.9806. The relative selectivity coefficients of Cr(Ⅲ)-ⅡPs for Cr³⁺/Cr⁶⁺, Cr³⁺/Cu²⁺, Cr³⁺/Cd²⁺, Cr³⁺/Hg²⁺, Cr³⁺/Co²⁺, Cr³⁺/Ni²⁺ were 5.13, 1.21, 1.97, 1.71, 1.27 and 4.00, showing that Cr(Ⅲ)-ⅡPs had strong selectivity for Cr³⁺ ions. After regeneration for ten times, the adsorption capacity of Cr(Ⅲ)-ⅡPs remained at 90.7%. The Cr(Ⅲ)-ⅡPs showed good selectivity, reusability and stability.
- Chromium (Ⅲ),
- Imprinted polymer,
- Mesoporous silica,
- Adsorption property
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