Controllable Synthesis of Multi-morphological Hollow Mesoporous SiO2 and Adsorption Reduction of Cu 2+ by Its Composites †

doi:10.7503/cjcu20190244

Abstract

Abstract:

A concise and facile one-pot sol-gel method was proposed by using resorcinol/formaldehyde(RF) resin as soft template, tetraethyl orthosilicate(TEOS) as silicon source, hexadecyl trimethyl ammonium bromide(CTAB) as pore-forming agent to fabricate hollow mesoporous silica microspheres(HMSM). A series of HMSM with different structures and topography was obtained by simply adjusting the formaldehyde amount. As the formaldehyde amount increased, the morphology of the as-prepared hollow spheres changed from single-shelled, to yolk-shelled, double-shelled and then turned back. The yolk-shelled HMSM possessed a large specific surface area(691 m ²/g), large pore volume(2.23 cm ³/g), and uniform mesopores(3.5 nm). HMSM-g-PAO(PAO=polyamidoximation) was prepared by tranforming the cyano groups in polyacrylonitrile(PAN) of 6-HMSM-g-PAN, which was prepared from yolk-shelled HMSM through polymerization of acrylonitrile initiated by ceric ammonium nitrate. As 100 mg/L CuCl₂ solution was used as the target solution, the adsorption and reduction effect of HMSM-g-PAO was tested at pH=4.0, and the adsorption amount could reach 134 mg/g when adsorption balanced.

Key words: Hollow mesoporous silica, Soft template, Polyamidoxime, Cu ²⁺ adsorption

CLC Number:

O631

TrendMD:

ZHANG Chen,WU Chang,HAN Weihao,GONG Yumei,SHI Qiang. Controllable Synthesis of Multi-morphological Hollow Mesoporous SiO₂ and Adsorption Reduction of Cu ²⁺ by Its Composites ^†[J]. Chem. J. Chinese Universities, 2019, 40(11): 2412.

Figures/Tables 7

Scheme 1 Synthesis strategy of HMSM with different shell numbers tuned by formaldehyde

Fig.1 SEM(A—E) and TEM(F—J) images of the 2-HMSM(A, F), 4-HMSM(B, G), 6-HMSM(C, H), 8-HMSM(D, I) and 10-HMSM(E, J)

Fig.2 N2 adsorption-desorption isotherms and the corresponding pore-size distribution curves(insets) of 2-HMSM(A), 4-HMSM(B), 6-HMSM(C), 8-HMSM(D) and 10-HMSM(E)

Fig.3 FTIR spectra of the synthesized 6-HMSM(a), 6-HMSM-g-PAN(b) and 6-HMSM-g-PAO(c)

Fig.4 XRD patterns of 6-HMSM(a), 6-HMSM-g- PAN(b), and 6-HMSM-g-PAO(c)

Fig.5 Amount of copper adsorbed by 6-HMSM-g-PAO(A), pseudo-primary(B) and pseudo-secondary(C) dynamics models established for the adsorption process Inset of (A): Cu2+ solution before(a) and after adsorbed(b) by 6-HMSM-g-PAO.

Fig.6 Typical XPS survey spectra for 6-HMSM-g-PAO-Cu(A) and high resolution XPS spectra of Cu for 6-HMSM-g-PAO-Cu(B)

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Controllable Synthesis of Multi-morphological Hollow Mesoporous SiO₂ and Adsorption Reduction of Cu ²⁺ by Its Composites ^†

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