ADSORPTION OF Mg(II) AND Ca(II) ON DISULFONATO-SILICA HYBRID

被引:7
作者
Azmiyawati, Choiril [1 ,2 ]
Nuryono [2 ]
Narsito [2 ]
机构
[1] Univ Diponegoro, Dept Chem, Tembalang, Semarang, Indonesia
[2] Univ Gadjah Mada, Fac Math & Nat Sci, Dept Chem, Sekip Utara 55281, Yogyakarta, Indonesia
关键词
adsorption; silica; magnesium; calcium; sulfonate;
D O I
10.22146/ijc.21334
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Adsorption of Mg(II) and Ca(II) on disulfonato-silica hybrid (DSSH) in the aqueous solution has been studied. The hybrid was synthesized by sol-gel process with sodium silicate solution from rice hull ash, chloroprophyltrimethoxysilane (CTS) and 4-amino-5-hydroxy-naphtalene-2,7-disulfonic acid monosodium salt (ANSNa) as silica source, cross linker and active group, respectively. Sodium silicate solution was reacted with CTS and ANSNa that were added dropwise. Adsorption of magnesium and calcium ions on DSSH was carried out in a batch system. Solution pH significantly affected magnesium and calcium adsorption and the optimum condition was obtained at pH = 6. The synthesized DSSH showed a high adsorption capacity of 0.0844 mmol/g and 0.1442 mmol/g for Mg(II) and Ca( II), respectively. The adsorption isotherm obtained with Langmuir isotherm model gives the negative values of Delta G degrees, i.e. -23.334 kJ/mol and -22.757 kJ/mol for Mg(II) and Ca(II), respectively, indicating the spontaneous process of adsorption. Kinetic studies showed that the adsorption of Mg(II) and Ca(II) ions onto HDSS follows the pseudo-second-order kinetics.
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页码:223 / 228
页数:6
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