Study on Pore Diameter Regulation of Thiol Functionalized Mesoporous Silica and Cu²⁺ Adsorption Performance

Abstract:

New thiol modified mesoporous adsorbent with different pore sizes was synthesized by hydrothermal, with triblock copolymers pluronic (F127) and cetyltrimethyl ammonium bromide (CTMABr) functioned as the mixing template, 1,3,5-trimethylbenzene (TMB) functioned as pore-expanding agent. Adsorption performance of different pore sized mesoporous adsorbents was studied by treatment of Heavy metal Cu2+. Results showed that the optimum dosage was molar ratio of 1.5 between TMB and surfactant, and under that condition, the BET pore size was 6.554 nm and BET pore volume was 0.6134cm3/g. The adsorption of Cu2+ on mesoporous adsorbents fitted well to Redlich-Peterson isotherm equation, which indicated chemisorption was dominant in the process of heavy metal adsorption on the mesoporous adsorption and monomolecular layer adsorption took advantage. According to Langmuir equation, QL was 0.6210 mmol/g, and that demonstrated pore-expanding treatment could not only enlarge pore volume and diameter, but also effectively increase the contact area with heavy metals. Pore-expanded functionalized mesoporous silica could act as the optimal adsorbents for heavy metal adsorption.

• Periodical: Advanced Materials Research (Volumes 393-395)
• Pages: 319-323
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.393-395.319
• Online since: November 2011
• Authors: Xiao Ming Xue, Hai Tao Guo, Hong Tao Wang, Sheng Bin Zhuang
• Keywords: Adsorption, Cu²⁺, Heavy Metal, Mesoporous, Pore-Enlarging Agent

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DOI: 10.1007/s10450-007-9003-y