Kinetic and equilibrium studies on phosphate adsorption by surfactant modified kapok fibre

Fung, Wei Ning (2010) Kinetic and equilibrium studies on phosphate adsorption by surfactant modified kapok fibre. Universiti Malaysia Sabah. (Unpublished)


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The adsorption of phosphate onto surfactant modified kapok fibre (SMKF) and natural kapok fibre (NKF) was investigated according to batch method at varying contact time, initial phosphate concentration, and adsorbent dosage. The surface characteristic of kapok fibre was modified by hexadecyltrimethylammonium-bromide (HDTMA-Br), which is a cationic surfactant to produce SMKF. The final concentration of phosphate solution was determined according to acid ascorbic method. The results showed that phosphate adsorption by SMKF and NKF approached equilibrium within the first 5 minutes. The adsorption of phosphate by SMKF and NKF conforms (R2 > 0.999) to pseudo-second order kinetic model. The amount of phosphate adsorption Increased but adsorption efficiency decreased with increase in initial phosphate concentration from 1 µg/mL to 5 µg/mL for both SMKF and NKF. The adsorption of phosphate on SMKF can be well described (R2 > 0.99) by both Freundlich and Langmuir isotherm while NKF fitted well (R² > 0.80) only to Freundlich isotherm. The maximum phosphate adsorption capacity, qrnaXi for SMKF and NKF were 263 µgg�¹ and 56 µgg�¹, respectively. The total amount of phosphate adsorbed and the percentage of phosphate adsorbed by SMKF and NKF decreased as the amount of the adsorbent increased. Overall, surface modification with a cationic surfactant was able to enhance the ability of NKF to adsorb phosphate.

Item Type: Academic Exercise
Uncontrolled Keywords: adsorption dosage, phosphate, surfactant modified kapok fibre, natural kapok fibre, varying contact time, acid ascorbic
Subjects: Q Science > QD Chemistry
Divisions: SCHOOL > School of Science and Technology
Depositing User: Unnamed user with email
Date Deposited: 14 Jul 2016 02:09
Last Modified: 20 Nov 2017 03:33

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