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301-308.pdf

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Polish J. of Environ. Stud. Vol. 19, No. 2 (2010), 301-308

Original Research

Synthesis of Modified Mesoporous Materials and Comparative Studies of Removal of Heavy Metal from Aqueous Solutions

Ping Ge, Fengting Li*, Bingru Zhang

State Key Lab of Pollution Control and Resource Reuse Study, College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, China

Received: 1 June 2009 Accepted: 16 August 2009

Abstract

The functionalized mesoporous’ potential ability of binding heavy metals using different templates, namely cetyltrimethylammonium (CTAB) (adsorbent A) and triblock copolymer (Pluronic P123, EO20PO70EO20,Mav = 5800) (adsorbent B), was evaluated. The synthesized materials were characterized by powder X-ray diffraction (XRD), nitrogen gas sorption, FT-IR and solid-state 13C and 29Si NMR spec- troscopy and thermogravimetry (TGA) measurements. In the adsorption experiment, the effects of several variables (stirring time, pH and presence of other metals in the medium) were studied. On the basis of these results, it was observed that the adsorption capacities were higher for adsorbent B than adsorbent A. The results also confirmed that the ureido group (CO-NH2) has a good affect of binding metal ion.

Keywords: mesoporous silica, modified, character, heavy metal, removal

Introduction

With the development of industrial production, large quantities of heavy metals have been released into the nat- ural environment. Heavy metals are mostly toxic, even at very low concentrations. For example, copper is a trace ele- ment essential to life, the total copper of the normal human body is about 100-150 mg. Excessive intake of copper is toxic to humans. The harmful effects include a number of disorders, such as making active protein in the body invalid, causing itching, and skin inflammation. In order to remove heavy metal from aqueous solutions, an encouraging branch of techniques have evolved in recent years involv- ing the synthesis of designed materials [1-4].

Many chemical and biological treatments have been applied in the removal of heavy metal from waters [5-11].

Mesoporous materials functionalized with various organic groups are among the most popular methods used to control such pollutants [12-15].

The preparation of mesostructured silicas since 1992 [16] has opened a wide field of applications [17-19]. Main research interests have focused on the use of non-ionic sur- factants or ionic liquids for synthesis [20, 21], the charac- terization of materials by advanced techniques [22, 23], and potential applications of new materials in adsorption or catalysis [24-26]. Functionalization of these materials has gained recognition as the most exceptional adsorbents for heavy metal [27-32]. The incorporation of functionalities can be achieved by:

(a) “Two-step” procedure: grafting the organic component

onto a pure silica matrix (namely post-synthesis treat-

ment),

(b) “One-step” procedure: co-condensation of inorganic

*e-mail: fengting@tongji.edu.cn

silica species with a silylating organic compound, and

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 Supercritical Fluid Extraction 301-308.pdf Page 001
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