Synthesis and Copper(II) Affinity Performance of Amidoxime Functionalized Mesoporous Silica

doi:10.15541/jim20150483

Abstract

Abstract:

Amidoxime-functionalized mesoporous silica was synthesized with tetraethylorthosilicate and 2-cyanoethyl triethoxysilane as silicon source, potassium chloride as the crystal structure directing agent and poly (ethylene glycol)-poly (propylene glycol)-poly (ethylene glycol) three block copolymers as template. The structure of the samples, pore properties and chelating function groups were characterized by X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), N₂adsorption desorption isotherms and elemental analysis. XRD spectra and N₂ physical adsorption-desorption results indicate that amidoxime functioned mesoporous silica has ordered two-dimensional hexagonal structure with average pore size of 3.96 nm and specific surface area of 435 m²/g. FT-IR spectra shows that cyano is introducted into silica and converted into amidoxime successfully. Amidoxime concentration is about 1.6 mmol/g by elemental analysis and Zeta potential analysis results show that the adsorbent is electronegative. Compared with the Cu²⁺ adsorption capacities of unmodified silica material (SBA-15) and cyano functionalization of porous silicon oxide (CN-SBA-15), the adsorption capacity of AO-SBA-15 increases by 2 fold and 3.6 fold, respectively. This shows that with the introduction of amidoxime chelating function groups, affinity performance of SBA-15 to the copper ions are markedly improved.

Key words: Cu2+, SBA-15, cyano, amidoxime, affinity performance

CLC Number:

X703

WEI Jian-Wen, WANG Ji-Hua, ZHAO Song-Sheng, GENG Lin-Lin. Synthesis and Copper(II) Affinity Performance of Amidoxime Functionalized Mesoporous Silica[J]. Journal of Inorganic Materials, 2016, 31(5): 449-453.

Figures/Tables 7

Fig. 1 Powder XRD patterns of AO-SBA-15 and SBA-15

Fig. 2 N2 adsorption/desorption isotherm of AO-SBA-15

Fig. 3 Pore size distribution curve of AO-SBA-15

Fig. 4 Fourier transform infrared spectra of AO-SBA-15 and CN-SBA-15

Table1 Elemental analysis of AO-SBA-15

Samples	Element content/%			C:N	-CN, -AO
Samples	C	N	H	C:N	/(mmol·g^-1)
CN-SBA-15	11.35	2.34	3.43	3.86	2.5
CN-SBA-15	11.24	2.45	3.45	3.80	2.5
AO-SBA-15	8.28	2.71	4.44	2.18	1.6
AO-SBA-15	8.38	2.58	4.48	2.18	1.6

Fig. 5 Zeta potential distribution of AO-SBA-15 before and after adsorbing Cu2+

Fig. 6 Cu2+ affinity of materials containing different groups

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