Abstract
The adsorption capacity of modified (MML) and unmodified (UML) mangrove leaves sorbents on chromium (VI) was analyzed in terms of pH, adsorbent doze, chromium (VI) concentration and contact time using batch adsorption technique. Results obtained showed greater chromium (VI) adsorption on MML than UML. Adsorption capacity diagrams described for MML were higher than those of UML. The adsorption was influenced by low medium pH, low adsorbent dosage, high chromium (VI) concentration and long contact time. Adsorptive capacity decreased from 15.9 - 14.19mgg-1, for MML and 13.59 - 12.19mgg-1, for UML and from 74.99 - 9.59mgg-1, for MML and 44.89 - 5.79mgg-1, for UML as pH and adsorbent dosage were increased from (2 to 8) and (0.25 to 2g); but increased from 5.09 - 46.19mgg-1, for MML and 1.89 - 25.59mgg-1, for UML and from 26609.0 - 38719.0mgg-1, for MML and 28869.0 - 35089.0mgg-1, for UML as concentration of chromium (VI) and time of contact increased from (10 to 100ppm) and (30 to 240minutes), respectively. Isotherm studies reveal that experimental data for MML and UML fitted on Freundlich adsorption (R2 ≥ 0.93). Kinetic data analyses, with (R2 ≥ 0.962) on pseudo-second order model, suggest chemisorption process for both sorbents. These results suggest the extract of mangrove leaves material after acid modification can be used as biosorbent for chromium (VI) removal in aqueous solution.Keywords: Adsorption, Mangrove Leaf, Chromium (VI), Freundlich, Langmuir
Highlights
The adsorption capacity of modified (MML) and unmodified (UML) mangrove leaves sorbents on chromium (VI) was analyzed in terms of pH, adsorbent doze, chromium (VI) concentration and contact time using batch adsorption technique
The results show that the adsorption of chromium (VI) by both MML and UML decreased with the pH of the medium
With pseudo-second order qe and K2 values of 5000mg/g and 6.66 × 106g/mg/minute computed for MML, and 3333mg/g and 3.103 x10-5g/mg/minute for UML, the results suggest that adsorption of chromium (VI) on the biomass occurred by chemical means and MML was a better adsorbent than UML
Summary
The adsorption capacity of modified (MML) and unmodified (UML) mangrove leaves sorbents on chromium (VI) was analyzed in terms of pH, adsorbent doze, chromium (VI) concentration and contact time using batch adsorption technique. With (R2 ≥ 0.962) on pseudo-second order model, suggest chemisorption process for both sorbents These results suggest the extract of mangrove leaves material after acid modification can be used as biosorbent for chromium (VI) removal in aqueous solution. The stem of the plant is harvested for use as fire wood and for making charcoal by the inhabitants of the local communities while the leaves and roots are left as wastes Conversion of these to valuable adsorbents would be economical but help reduce the waste disposal problems. The adsorption efficiencies of modified (MML) and unmodified (UML) leaves extracts sorbents in taking up chromium (VI) from aqueous solution was investigated by batch adsorption method. The objective of this paper was to evaluate and report the adsorption capacities of modified and unmodified mangrove leaf sorbents
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