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Modified Silica-Based Mesoporous Materials and Appliation in the Heavy Metal Adsorption

Author: FangDongMei
Tutor: DuYiPing；WangZheng
School: East China University of Science and Technology
Course: Analytical Chemistry
Keywords: Silica Mesoporous Materials Hg (Ⅱ) Cr (Ⅵ) FI-SPE-FAAS
CLC: TB34
Type: Master's thesis
Year: 2012
Downloads: 66
Quote: 0
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Abstract


In recent years, industrial pollution is more and more serious, with the rapid economic development, especially the heavy metals in waste water pollution. The hazards of heavy metals for biosphere can not be ignored. The traditional adsorbent for processing heavy metals is high cost and difficult to recycle. Therefore, it is an important significance to synthesize an efficient and environmental material used for treating heavy metals.A thioether functionalized organic-inorganic mesoporous composite as a high selective absorbent for mercury in wastewater was synthesized by one-step co-condensation of (1,4)-bis (triethoxysilyl) propane tetrasufide and tetraethoxysilane. The hybrid material could be highly selective adsorption of Hg (II). Under the optimized conditions the adsorption efficiency was 91%.In this paper, SBA-15 mesoporous silica was functionalized successively by grafting with y-aminopropyltriethoxysilane (APTES). The structure and physicochemical properties of the material were characterized by means of TEM, FT-IR, XRD and N2 absorption-desorption. The selective absorbent capability of heavy metal ions [such as Cr (Ⅵ), Cu (Ⅱ), As (Ⅴ)]was different at different pH condition.Additionally, NH2-SBA-15 was used for the first time in a flow injection on-line solid phase extraction coupled with flame atomic adsorption spectrometry for speciation analysis of trace chromium under controlled pH conditions. An enrichment factor of 44 for Cr (VI) and a detection limit of 0.2μg·L-1 were achieved under optimized experimental conditions.

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