Abstract
This study uses batch experiment to compare the binding efficiency of phosphate onto Albizia lebbeck (ALB) pod with and without citric acid (CALB) or tartaric acid (TALB) modification. The residual phosphate concentration was analyzed using ascorbic acid method and the generated data were fitted into equilibrium isotherms and kinetics models. Intra-particle diffusion model was used to describe the biosorption mechanism. Characterization by FTIR spectroscopy and SEM shows that modification was successful. The maximum biosorption capacity occurred at biosorbent dosage of 0.5 g for ALB and 1.0 g for CALB and TALB. At optimum pH for each biosorbents, phosphate biosorption capacity is in the order ALB>CALB>TALB. Equilibrium time of 90, 150 and 60 minutes were recorded for phosphate on ALB, CALB and TALB respectively. The biosorption capacity increases as the initial anion concentration increases with highest biosorption capacity of 5.296 mg/g for ALB. Langmuir isotherm describes CALB data while TALB data fits Freundlich. Results from this study suggest that unmodified Albizia lebbeck can be used as a low-cost, highly-efficient biosorbent for phosphate removal in effluents.
Highlights
MATERIALS AND METHODSEquipment and Reagent: All chemicals/reagents used in this study were of analytical reagent grade, they were used as obtained without further purification
Phosphate is an essential nutrient required for plant and microorganism growth whether in aquatic or terrestrial environment, it’s excess beyond desired limit in aquatic environment causes eutrophication which results into algae bloom and water quality degradation due to nutrient ratio alteration (Das et al, 2006)
This present study investigate and compare phosphate biosorption capacity on modified and unmodified albizia lebbeck seed pod, this was done as a function of dosage, time, pH and concentration
Summary
Equipment and Reagent: All chemicals/reagents used in this study were of analytical reagent grade, they were used as obtained without further purification. After washing 1g adsorbent with 200mL deionized water, the filtrate was evaporated, and the recovered citric acid was weighed This procedure was followed for tartaric acid modification. The pH effect was studied using the initial anion concentration of 2.5mg in 50mL of deionized water, the weight as used in effect of time consideration were used and the bottles were shaken for each biosorbent equilibrium time. Biosorption can be characterized by a variety of equilibrium isotherm models In this present study, biosorption data were fitted into three sorption models, the parameters obtained from the models provide important information about the biosorbent affinity for phosphate, its surface property and the sorption mechanism. Where k 2 is the rate constant of pseudo-second order sorption (mg/g min), qe and q are the amount adsorbed at equilibrium and at time t respectively. If the plot passes through the origin, intra-particle diffusion is the rate-determining step (Park et al, 2010)
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