期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 356, 期 1, 页码 248-256出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.12.030
关键词
SBA-15; Mesoporous silica; DABCO; Adsorbents; Ethanol purification
资金
- CNPq
- FAPESP
This work describes the preparation and characterization of postfunctionalized ordered (SBA-15) and nonordered (SMD) mesoporous silicas with n-propyl-1,4-diazoniabicycle[2.2.2]octane chloride (DbCl) moiety. The main interest is based on the fact that these materials are excellent adsorbents due to the ability of functional groups to retain copper chlorides on their surfaces as anionic complexes CuCl2+nn-. The specific surface areas (S-BET) and average pore diameters (d(pore)) for SBA-15 and SMD are SBA-15, S-BET = 944 m(2) g(-1), d(pore) = 9.0 nm; SMD, S-BET = 710 m(2) g(-1), d(pore) = 11 nm. On functionalization with DbCl, reductions in the specific surface areas of the resulting materials (SBA-15/DbCl and SMD/DbCl) are observed and the following functionalization degrees (phi) were determined: SBA-15/DbCl, S-BET = 247 m(2) g(-1), phi = 0.95 mmol g(-1); SMD/DbCl, S-BET = 83 m(2) g(-1), phi = 1.2 mmol g(-1). The adsorption equilibria of CuCl2 in ethanol were characterized, and the heterogeneous stability constants, beta(1) and beta(2), corresponding to formation of CuCl42- and CuCl3- anionic species adsorbed on the surface were found. Also, the effective sorption capacities (t(Q)) were determined: SBA-15/DbCl, log beta(1) = 4.46, log beta(2) = 7.10, t(Q) = 0.80 mmol g(-1); SMD/DbCl, log beta(1) = 4.95, log beta(2) = 7.52, t(Q) = 0.75 mmol g(-1). Regeneration of the adsorbents requires a very simple procedure consisting of their immersion in aqueous solution followed by immediate release to the solution phase of the Cu(OH2)(n)(2+) species, followed by chloride anions as the counterions. (C) 2011 Published by Elsevier Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据