Polyamidoximation of Hollow Mesoporous Silica and Its Application in Adsorption of Cr(Ⅵ)†

doi:10.7503/cjcu20160398

Abstract

Abstract:

Polyamidoximation of hollow mesoporous silica(HMS/PAO) was prepared by tranforming the cyano groups in polyacrylonitrile grafted from hollow mesoporous silica(HMS) through polymerization of acrylonitrile initiated by ceric ammonium nitrate. The hollow mesoporous silica was prepared by a facile one-pot sol-gel method. The microstructure and characteristic of the HMS and HMS/PAO were examined by Fourier transform Infrared spectra(FTIR), X-ray diffraction, scanning electron microscope(SEM), N₂ adsorption desorption isotherm. The results showed that the diameter of the HMS was about 400 nm, and the size of the mesoporous was ca. 11.0 nm. The size of the mesoporous was ca. 4.6 nm and more uniform and smaller. As potassium dichromate solution(K₂Cr₂O₇) was used as a target solution for detecting adsorption capacity of the prepared HMS/PAO, the adsorption chromium kinetics was consistent with the pseudo-second-order kinetics model by analyzing the adsorption amount as a function of the sorbent dispersed duration in solution at pH=2.0. The adsorption capacity of HMS/PAO for chromium was as much as 0.46 mmol/g. Therefore, it is an adsorbent with high efficiency.

Key words: Hollow mesoporous silica, Amidoximation, Cr(Ⅵ) adsorption, Anchor

CLC Number:

O631

TrendMD:

LI Miaomiao, GONG Yumei, GUO Jing, YU Yue, ZHANG Sen, ZHAO Miao. Polyamidoximation of Hollow Mesoporous Silica and Its Application in Adsorption of Cr(Ⅵ)^†[J]. Chem. J. Chinese Universities, 2017, 38(1): 159.

Figures/Tables 10

Scheme 1 Schematic illustration of the HMS/PAO preparation

Fig.1 Typical SEM images of HMS Insert: a collapsed HMS sphere.

Fig.2 FTIR spectra of HMS(a), HMS/PAN(b) and HMS/PAO(c)

Fig.3 N2 adsorption and desorption profiles of HMS(A) and HMS/PAO(B)

Table 1 Characteristics of the synthesized HMS and HMS/PAO

Sample	Specific surface area/(m²·g^-1)	Total pore volume, V/(cm³·g^-1)	Average pore diameter/nm
HMS	431	1.16	11.0
HMS/PAO	347	0.55	4.6

Fig.4 Color of the K2Cr2O7 solutions at pH=2.0(A) Original HMS; (B) dispersing HMS/PAO; (C) dispersing HMS.

Scheme 2 Adsorption mechanism of Cr(Ⅵ) and Cr(Ⅲ) on HMS/PAO

Fig.5 Amount of chromium(mg) adsorbed by per gram HMS/PAO(A), the plot of lg(qe-qt) vs. t(B) and the plot of t/qt vs. t(C)(A) m=50 mg, c0=1 mg/mL, T=298.15 K, pH=2.0, V=50 mL.

Table 2 Adsorption kinetic parameters of HMS/PAO for Cr(Ⅵ)

Model	q_e,exp/(mg·g^-1)	q_e,cal/(mg·g^-1)	k₁/min	R²
Pseudo-first-order	23.68	10.99	0.014	0.731
Pseudo-second-order	23.68	31.53	0.002	0.965

Table 3 Comparation of the adsorption capacity of synthesized HMS, HMS/PAN, and HMS/PAO on Cr(Ⅵ) with that of amino group and amidoxime group modified mesoporous silica on Zn(Ⅱ), Cu(Ⅱ) and Pb(Ⅱ) in literatures

Adsorbent	Ion	Capacity/(mmol·g^-1)	Ref.	Adsorbent	Ion	Capacity/(mmol·g^-1)	Ref.
AD-2-SiO₂-CN400	Pb(Ⅱ)	0.45	[22]	HMS	Cr(Ⅵ)	0.04	This paper
MCM-NH₂	Zn(Ⅱ)	0.22	[17]	HMS/PAN	Cr(Ⅵ)	0.14	This paper
MCM-NH₂	Cu(Ⅱ)	0.18	[17]	HMS/PAO	Cr(Ⅵ)	0.46	This paper

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