کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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609783 | 880630 | 2010 | 7 صفحه PDF | دانلود رایگان |
Large-pore phenyl-bridged periodic mesoporous organosilicas (PMOs) were facilely synthesized by evaporation-induced self-assembly of 1,4-bis(triethoxysily)benzene and triblock copolymer Pluronic F127 as a template under acid conditions combined with a mixed-solvothermal treatment. The ordered PMOs exhibit large uniform mesopores of ∼9.9 nm in diameter after calcination at 350 °C in a nitrogen atmosphere. The mesoporous phenyl-bridged organosilica products have an ordered hexagonal mesostructure with space group p6mm. N2 adsorption/desorption isotherms reveal imperfect mesopore channels with high surface areas (up to 1150 m2/g) and thick pore walls (up to 7.7 nm). The mesopores can be expanded with the decrease of acidity, as well as the increase of Pluronic F127 content. A mixed-solvothermal treatment in N,N-dimethylformamide (DMF) and water at 100 °C was first used to improve the periodicity of the mesopore walls, as well as increase the wall thickness. The composites exhibit efficient adsorption capacities (2.06 mmol g−1) for benzene, suggesting a potential adsorbent for removal of volatile organic compounds. The EISA approach combined with the mixed-solvothermal treatment provides important insights into the development of large-pore PMOs by using long-chain organosilanes, and further demonstrates the ability to fabricate materials with thick walls.
Phenyl-bridged PMOs with ordered hexagonal mesostructures were synthesized via the EISA approach by using Pluronic F127 as a template. The materials exhibit an adsorption capacity of benzene up to 2.06 mmol g−1.Figure optionsDownload high-quality image (210 K)Download as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 346, Issue 2, 15 June 2010, Pages 429–435