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Mechanisms of Competitive Adsorption Organic Pollutants on Hexylene-Bridged Polysilsesquioxane

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College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
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State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
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Department of Plant, Soil & Insect Sciences, University of Massachusetts Amherst, MA 01003, USA
4
Departments of Materials Science & Engineering and Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Dermot Brabazon
Materials 2015, 8(9), 5806-5817; https://doi.org/10.3390/ma8095275
Received: 15 July 2015 / Revised: 20 August 2015 / Accepted: 21 August 2015 / Published: 31 August 2015
(This article belongs to the Special Issue Porous Monolithic Materials for Applications in Separation Science)
Hexylene-bridged periodic mesoporous polysilsesquioxanes (HBPMS) are a promising new class of adsorbent for the removal of organic contaminants from aqueous solutions. These hybrid organic-inorganic materials have a larger BET surface area of 897 m2·g−1 accessible through a cubic, isotropic network of 3.82-nm diameter pores. The hexylene bridging group provides enhanced adsorption of organic molecules while the bridged polysilsesquioxane structure permits sufficient silanols that are hydrophilic to be retained. In this study, adsorption of phenanthrene (PHEN), 2,4-Dichlorophenol (DCP), and nitrobenzene (NBZ) with HBPMS materials was studied to ascertain the relative contributions to adsorption performance from (1) direct competition for sites and (2) pore blockage. A conceptual model was proposed to further explain the phenomena. This study suggests a promising application of cubic mesoporous BPS in wastewater treatment. View Full-Text
Keywords: hexylene bridged polysilsesquioxane; organic pollutants; pore blockage; competition adsorption sites; competitive adsorption hexylene bridged polysilsesquioxane; organic pollutants; pore blockage; competition adsorption sites; competitive adsorption
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Lin, D.-R.; Hu, L.-J.; Xing, B.-S.; You, H.; Loy, D.A. Mechanisms of Competitive Adsorption Organic Pollutants on Hexylene-Bridged Polysilsesquioxane. Materials 2015, 8, 5806-5817.

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