"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Facile fabrication of amino-functionalized porous materials for Pb2+ removal

Y. ZHAO, S. ZHAI1,* , B. ZHAI, Q. AN1,*

Affiliation

  1. Faculty of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034

Abstract

A facile sol-gel strategy was employed to fabricate amino-functionalized hybrid xerogels using mono-, di-, tri-amino-organoalkoxysilanes, polymeric polymethlhydrosiloxane (PMHS) and tetraethylorthosilicate (TEOS) as co-precursors without traditional structure-directing agents. The loadings of amino moieties of the amino-functionalized xerogels could be tuned from 5% to 30% by adjusting the molar ratio of organoalkoxysilane/ silica in the synthesis system. The N2 sorption isotherms, SEM, and TEM techniques revealed that these as-prepared hybrids possess typical wormhole-like framework structures with high specific surface area (~ 532 m2 /g), large pore volumes (~ 0.99 cm3 /g) and relatively narrow pore diameter (~ 7.5 nm). The NMR, FT-IR, TG-DTG and elemental analysis indicated that amino groups had been successfully introduced into the final xerogel-like samples, and the content could be variable from 0.36 to 5.03 mmol/g. The adsorption of Pb2+ experiments were conducted batchwise in water at room temperature. The results showed that adsorption capacity increased with the concentration of amino groups in the functionalized xerogel, and the maximum adsorption capacities of 176, 176 and 193 mg/g were obtained using mono-, di- and tri-amino-functionalized adsorbents, respectively. These results implied that the accessibility of the amino groups introduced to the framework via the sol-gel condensation method were different..

Keywords

Sol-gel process, Hybrid material, Adsorbent, Amino-functionalized.

Submitted at: Aug. 28, 2011
Accepted at: Oct. 20, 2011

Citation

Y. ZHAO, S. ZHAI, B. ZHAI, Q. AN, Facile fabrication of amino-functionalized porous materials for Pb2+ removal, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 10, pp. 1324-1330 (2011)