Sains Malaysiana 39(1)(2010): 99–106

 

Influence of Humic Acids on Radium Adsorption by Coir Pith in Aqueous Solution

(Pengaruh Asid Humik terhadap Penjerapan Radium oleh Sabut Kelapa di dalam Larutan Akueus)

 

Zalina Laili & Muhamad Samudi Yasir*

Nuclear Science Programme

School of Applied Physics, Faculty of Science and Technology

University Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia

 

Muhamat Omar, Mohd Zaidi Ibrahim & Esther Philip

Malaysian Nuclear Agency, Bangi, 43000 Kajang, Selangor D.E., Malaysia

 

Received: 14 March 2009 / Accepted: 19 June 2009

 

 

ABSTRACT

 

This study examines the influence of humic acids (HA) on adsorption of radium (Ra) ions onto coir pith (CP) in aqueous solution. The adsorption behaviours of Ra ions onto CP under the influence of HA in aqueous solution were investigated in the series of batch mode adsorption experiments. The effects of various experimental conditions such as pH, contact time, adsorbent dosage and initial concentration of Ra ions have been studied. The results revealed that the presence of HA in aqueous solution enhanced the adsorption of Ra ions onto CP. The adsorption results showed that the percentage of Ra adsorbed was increased with an increase in the pH or alkalinity of aqueous solutions. Time dependence of the batch studies showed that a contact time of one day was sufficient to reach equilibrium. The result also showed that there was no significant difference on the effect of adsorbent dose on adsorption of radium onto CP. It was shown that the equilibrium data could be fitted by Freundlich equation.

 

Keywords: Adsorption; coir pith; humic acid; radium

 

ABSTRAK

 

Kajian ini dijalankan bagi mengkaji pengaruh asid humik (HA) terhadap penjerapan ion radium (Ra) ke atas sabut kelapa (SK) di dalam larutan akueus. Kelakuan penjerapan ion Ra oleh SK dengan pengaruh HA di dalam larutan akueus dijalankan dalam siri eksperimen penjerapan mod kelompok. Kesan pelbagai keadaan eksperimen seperti pH, masa, dos bahan penjerap dan kepekatan ion Ra telah dikaji. Hasil kajian menunjukkan kehadiran HA di dalam larutan akueus menambahkan penjerapan ion Ra ke atas SK. Peratusan Ra terjerap juga meningkat dengan peningkatan pH atau kealkalian larutan akueus. Pergantungan masa dalam kajian kelompok menunjukkan masa penjerapan satu hari memadai bagi mencapai keadaan keseimbangan di samping tiada perbezaan signifikan bagi kesan dos bahan penjerap terhadap penjerapan Ra ke atas SK. Data keseimbangan menunjukkan ia dapat dipadankan dengan persamaan Freundlich.

 

Kata kunci: Asid humik; penjerapan; radium; sabut kelapa

 

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*Corresponding author; email: msyasir@ukm.my