PENGARUH PENAMBAHAN KITOSAN PADA SILIKA ABU SEKAM PADI SEBAGAI ADSORBEN KITOSAN-SILIKA UNTUK MENURUNKAN ION Pb(II)

Hesti Sri Prehatini; Amaria Amaria

doi:10.26740/ujc.v12n2.p64-72

Hesti Sri Prehatini Universitas Negeri Surabaya
Amaria Amaria Universitas Negeri Surabaya

DOI: https://doi.org/10.26740/ujc.v12n2.p64-72

Keywords: Silica, chitosan, adsorption, Pb(II)

Abstract

Chitosan silica (KS) adsorbent from rice husk ash and chitosan pharmaceutical grade from for Pb(II) adsorption was prepared. This study aims to determine the effect of pH and adsorption time on the adsorption ability of Pb(II) ions by KS. Rice husk ash was extracted into sodium silicate using NaOH. KS was prepared using the sol gel method with varying volumes of chitosan and silica, namely 1:1 (KS 1:1) and 2:1 (KS 2:1). Silica without chitosan KS 0:1 was synthesized used as a comparison. The KS synthesized was characterized using FTIR. The stability of KS was tested using a solution of pH 2-5 for 24 hours. The effect of pH and adsorption time was tested using Pb(II) solution. The remaining concentration of Pb(II) was measured using an AAS (Atomic Absorption Spectrophotometer). The results of the identification of the FTIR KS functional group showed absorption at wave numbers 1637.02 cm^-1 and 1060.1 cm^-1 which showed –OH bending vibrations of Si-OH and Si-O stretching vibrations of Si-O-Si. Absorption at wave numbers 1557.99 cm^-1 and 1420.47 cm^-1 shows the –NH bending vibration and –CN symmetry vibration of chitosan. KS 2:1 has a stability of 9% higher than KS 1:1 at pH 2-5 for 24 hours. The effect of adsorption pH for Pb(II) adsorption by KS 2:1 at pH 2-5 continued to increase until it reached the optimum pH at pH 5 with an adsorption capacity of 39.4 mg/g. The effect of adsorption time for Pb(II) adsorption increased and reached optimum adsorption time at 20 minutes adsorption time. Adsorption time data showed that KS 2:1 followed a pseudo second order kinetic model with a reaction rate constant of 9.072 g mmol^-1 min^-1.

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EFFECT OF ADDING CHITOSAN TO RICE HUSK ASH SILICA AS A CHITOSAN-SILICA ADSORBENT TO REDUCE Pb(II) IONS

Abstract

References