Malaysian Journal of Analytical Sciences Vol 24 No 1 (2020): 115 - 124

 

 

 

 

MAGNETIC KAOLINITE COMPOSITE FOR LEAD REMOVAL IN AQUEOUS SOLUTION

 

(Komposit Kaolinit Bermagnetik Untuk Penyingkiran Plumbum Dari Larutan Akueus)

 

Izzan Salwana Izman, Siti Nor Atika Baharin, Ruhaida Rusmin*

 

School of Chemistry and Environment, Faculty of Applied Sciences

Universiti Teknologi MARA, Negeri Sembilan Branch, Kuala Pilah Campus, 72000 Kuala Pilah, Negeri Sembilan, Malaysia

 

*Corresponding author:  ruhaida@uitm.edu.my

 

 

Received: 20 November 2019; Accepted: 21 January 2020

 

 

Abstract

Magnetic kaolinite composite was successfully synthesized using combination of kaolinite and iron oxide through co-precipitation method. The synthesized kaolinite-iron oxide (Kao-IO) and raw kaolinite (Kao) was characterized using X-ray diffractometer (XRD), scanning electron microscope (SEM), and Fourier-transform infrared spectroscopy (FTIR). The Kao-IO composite was used to remove Pb²⁺ ions from aqueous solution through adsorption studies under various experimental conditions (e.g. pH, contact time, and initial Pb concentration). Meanwhile the desorption studies of Pb loaded Kao-IO were performed with different desorbing agents. The optimum experimental condition was achieved at pH 6, reaction time of 120 min at initial concentration ranged from 10 to 70 mg/L. Kao-IO composite has a higher adsorption capacity (30.93 mg g^-1) compared to Kao (25.04 mg g^-1). Ethylenediaminetetraacetic acid (EDTA) was the best desorbing agent with the highest desorption efficiency (39.18%). Overall, Kao-IO composite demonstrated high potential as suitable adsorbent to treat Pb contaminated water.

 

Keywords:  kaolinite, magnetic, iron oxide, lead, adsorption

 

Abstrak

Komposit kaolinit bermagnetik telah berjaya disintesis menggunakan gabungan kaolinit dan ferum oksida melalui kaedah pemendakan bersama. Kaolinit-ferum oksida (Kao-IO) dan kaolinit asli (Kao) dicirikan menggunakan pembelauan sinar-X (XRD), Mikroskop imbasan elektron (SEM) dan spektroskopi inframerah transformasi Fourier (FTIR). Komposit Kao-IO digunakan untuk menyingkirkan ion Pb²⁺ dari larutan akueus melalui kajian penjerapan dengan menggunakan pelbagai parameter eksperimen (contohnya pH, masa tindak balas dan kepekatan awal Pb). Sementara itu, kajian nyahjerapan Pb yang terjerap pada Kao-IO dilakukan menggunakan pelbagai ejen nyahjerapan. Parameter eksperimen yang optima dicapai pada pH 6, masa tindak balas 120 minit dan pada kepekatan awal antara 10 hingga 70 mg/L. Komposit Kao-IO menunjukkan kapasiti penjerapan yang lebih tinggi (30.93 mg g^-1) berbanding dengan Kao (25.04 mg g^-1). Asid etilinadiaminatetraasetik (EDTA) merupakan ejen nyahjerapan yang terbaik dengan kecekapan nyahjerapan tertinggi (39.18%). Secara keseluruhan, komposit Kao-IO menunjukkan potensi yang tinggi sebagai penjerap yang sesuai untuk merawat air yang tercemar dengan Pb.

 

Kata kunci:  kaolinit, magnetik, ferum oksida, plumbum, penjerapan

 

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