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Understanding the Role of Triblock Copolymers for the Synthesis of Mesoporous Alumina, and Its Adsorption Efficiency for Congo Red
Author(s) -
Ghosh Sourav,
Naskar Milan Kanti
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12663
Subject(s) - copolymer , materials science , mesoporous material , chemical engineering , crystallization , adsorption , pulmonary surfactant , thermal stability , congo red , transmission electron microscopy , evaporation , composite material , nanotechnology , catalysis , chemistry , organic chemistry , polymer , physics , engineering , thermodynamics
Mesoporous alumina (MA)was synthesized by sol–gel based evaporation‐induced self‐assembly process using aluminum isopropoxide as alumina source in the presence of three different types of triblock copolymers (TBCs), F68, F127, and L64. The role of different TBCs as surfactants on thermal, crystallization, textural, and microstructural properties of the alumina powders was studied. To understand the effects of different copolymers, the adsorption efficiency of the samples for Congo red ( CR ) was studied. For all the surfactants, the XRD results showed the stability of γ‐ Al 2 O 3 phase up to 1000°C for 1 h dwell time. A maximum value (431.8 m 2 /g) of Brunauer–Emmet–Teller surface area was obtained for the 400°C‐treated powder prepared from F68 surfactant. The transmission electron microscopy micrograph exhibited worm‐like mesoporous structures of the 400°C‐treated powders prepared from F68 and F127 surfactants . The adsorption performance for CR of the 400°C‐treated powders for different surfactants was in the order of F68 > F127 > L64. A tentative mechanism was illustrated to understand the roles of different block copolymers on the properties of the prepared MA.