Designed pendant chain covalently bonded to silica gel for cation removal

被引:42
作者
Dey, Ratan K. [2 ]
Airoldi, Claudio [1 ]
机构
[1] Univ Estadual Campinas, Inst Quim, BR-13084971 Sao Paulo, Brazil
[2] Birla Inst Technol, Dept Appl Chem, Ranchi 835215, Bihar, India
关键词
silica gel; adsorption; cation removal; chelating material;
D O I
10.1016/j.jhazmat.2007.12.005
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The precursor 1,4-bis(3-aminopropyl)piperazine organofunctionalized silica gel reacted with methylacrylate to yield a new inorganic-organic chelating material, by adopting a heterogeneous and divergent synthetic approach. The synthesized materials were characterized through elemental analyses and spectroscopic techniques such as infrared, nuclear magnetic nuclei of carbon-13 and silicon-29. Due to the increment of basic centers attached to the pendant chains the metal adsorption capability of the final chelating material, was found to be higher than its precursor. The adsorption of metal ions from aqueous solution followed the order Cu2+ > Ni2+ > Co2+. Both Langmuir and Freundlich models were found to be applicable for the adsorption of copper, with the equilibrium parameter value within zero to one. The competitive sorption behavior, with variation of pH, was favorable for the separation of copper from binary mixtures with nickel and cobalt. When sodium, potassium and magnesium cations are present in the medium little effects on adsorption were observed, thus suggesting that the synthesized material can be useful for removal of toxic/heavy metal ions from natural and wastewater systems. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:95 / 101
页数:7
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