Ionic silica based hybrid material containing the pyridinium group used as an adsorbent for textile dye

被引:63
作者
de Menezes, Eliana W. [1 ]
Lima, Eder C. [1 ]
Royer, Betina [1 ]
de Souza, Felipe E. [1 ]
dos Santos, Bruna D. [1 ]
Gregorio, Jose R. [1 ]
Costa, Tania M. H. [1 ]
Gushikem, Yoshitaka [2 ]
Benvenutti, Edilson V. [1 ]
机构
[1] Univ Fed Rio Grande do Sul, Inst Chem, BR-91501970 Porto Alegre, RS, Brazil
[2] Univ Campinas UNICAMP, Inst Chem, BR-13084971 Campinas, SP, Brazil
关键词
Sol-gel; Grafting; Organofunctionalized silica; Effluent treatment; Nonlinear fitting; Dye removal from aqueous solution; PINE-FRUIT SHELL; AQUEOUS-SOLUTIONS; ANIONIC DYES; ADSORPTION; REMOVAL; SILSESQUIOXANE; KINETICS; CHLORIDE; BIOSORBENT; EVALUATE;
D O I
10.1016/j.jcis.2012.04.021
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The present study reports the development of an ionic silica based hybrid material containing the cationic pyridinium group, which was employed for the removal of the Reactive Red 194 textile dye from aqueous solution. Three hybrid material samples were prepared with planned textural and chemical properties, varying the inorganic precursor molar percentage in the sol-gel synthesis. The obtained samples were defined as Py/Si-90, Py/Si-92 and Py/Si-94, where the number specifies the inorganic molar percentage. The hybrid samples were characterized by elemental, infrared, C-13 and Si-29 NMR, N-2 adsorption-desorption isotherms and thermogravimetric analyses. The dye-removing ability of these adsorbents was determined by the batch contact adsorption procedure. Effects such as pH value and adsorbent dosage on the adsorption capacities were studied. Four kinetic models were applied. The adsorption was best fitted to Avrami fractional-order kinetic model for the three hybrid material samples. The kinetic data were also adjusted to an intra-particle diffusion model resulting three linear regions, indicating that the adsorption kinetics follows multiple sorption rates. The equilibrium data were fitted to Langmuir, Freundlich and Liu isotherm models. The maximum adsorption capacities were 165.4, 190.3 and 195.9 mg g(-1) for Py/Si-90. Py/Si-92 and Py/Si-94, respectively. Simulated dye-house effluents were used to check the applicability of the proposed adsorbents for effluent treatment. Dye loaded adsorbents were regenerated (>98.2%) by using 0.4 mol L-1 of NaOH solution as an eluent. (C) 2012 Elsevier Inc. All rights reserved.
引用
收藏
页码:10 / 20
页数:11
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