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Pengoptimuman Kondisi Adsorpsi Cd(II) oleh Adsorben Berbasis Silika Termodifikasi Glisina Menggunakan Central Composite Design

Optimization of Cd(II) adsorption condition by glycine-modified silica-based adsorbent using central composite design

Department of Chemistry, Faculty of Mathematics and Natural Sciences, IPB University, Indonesia

Received: 30 May 2019; Revised: 24 Aug 2019; Accepted: 9 Sep 2019; Published: 30 Sep 2019.
Open Access Copyright 2019 Jurnal Kimia Sains dan Aplikasi under

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Silica gel (SG) is one of common adsorbent on solid phase extraction for preconcentration. Due to the low selectivity and effectiveness of adsorption to metal ions, SG should be modified. The SG was modified with d-glycine (Si-Gly) using 3-aminopropyltrimethoxysilane and glutaraldehyde as a crosslinker. Capability of Si-Gly as adsorbent for cadmium ions (Cd) was investigated using batch adsorption. The result was proved by infrared spectra. The optimum condition of Cd adsorption by the Si-Gly was obtained at pH 5, with 0.3 g of adsorbent and 11 minutes of contact time. The percentage of Cd adsorption at the optimum condition by the Si-Gly (99.34%) which is greater than the SG (89.03%). The maximum adsorption capacity of the Si-Gly is 9.77 mg/g, obtained at 400 mg/L. The Cd(II) adsorption on the SG and the Si-Gly follow the Langmuir isotherm equation.
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Keywords: Adsorbent; Cd(II); D-glycine; silica gel

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