Sains Malaysiana 42(12)(2013): 1689–1696

Isoterma dan Kinetik Penjerapan Boron oleh Batu Kapur  Sebagai Penjerap Berkos Rendah

(Isotherm and Kinetic Adsorption of Boron onto Limestone As a Low-cost Adsorbent)

A.A. HALIM* & MOHD. FIRHAD AHMAD

Pusat Pengajian Sains Sekitaran dan Sumber Alam, Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Diserahkan: 27 Januari 2012/Diterima: 18 Julai 2013

ABSTRAK

Kajian ini dijalankan untuk menentukan isoterma dan kinetik penjerapan bahan pencemar boron daripada air sisa sintetik menggunakan batu kapur sebagai bahan penjerap berkos rendah. Penjerapan boron berlaku secara optimum pada julat pH6-8, masa sentuhan pada 90 min dan dos batu kapur 240 g/L yang penyingkirannya mencapai 40%. Isoterma penjerapan lebih diwakili oleh model Freundlich (R² = 0.91) berbanding model Langmuir (R² = 0.78) yang menunjukkan penjerapan secara multilapisan adalah dominan. Kajian kinetik penjerapan menunjukkan penjerapan boron ke atas batu kapur mematuhi dengan baik model penjerapan pseudo-tertib pertama (R² = 0.93), pseudo-tertib kedua (R² = 0.987), Elovich (R² = 0.931) dan Intrapartikel (R² = 0.960). Mekanisme penjerapan secara kimia adalah dominan berdasarkan nilaiR2 yang paling tinggi bagi model pseudo-tertib kedua.

Kata kunci: Batu kapur; penjerapan; penyingkiran boron

ABSTRACT

This study was performed to determine isotherm and kinetic adsorption of boron from synthetic wastewater using limestone as a low cost adsorbent. Boron adsorption was performed at optimum condition at pH range of 6-8, contact time of 90 min and limestone dosage of 240 g/L where the boron removal was achieved at 40%. Adsorption isotherm of boron on limestone was more representative by Freundlich model (R² = 0.91) rather than Langmuir model (R² = 78) indicated that multilayer adsorption was dominance. The kinetic study indicated that the adsorption of boron on limestone well obeyed pseudo-first order model (R² = 0.780), pseudo-second order (R² = 0.987), Elovich (R² = 0.931) and Intra-particle model (R² = 0.960). Chemically adsorption mechanisms were dominant in this study based on the highest R² for pseudo-second order model.

Keywords: Adsorption; boron removal; limestone

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*Pengarang untuk surat-menyurat; email: azharhalim@ukm.my