A comparative study on different metal loaded soybean milk by-product 'okara' for biosorption of phosphorus from aqueous solution
- Publication Type:
- Journal Article
- Bioresource Technology, 2014, 169 pp. 291 - 298
- Issue Date:
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|A comparative study on different metal loaded soybean milk by-product 'okara' for phosphorus biosorption (BITE 13609).pdf||Published Version||937.44 kB|
|Accepted Manuscript A comparative study on metal loaded okara for phosphorus biosorption (BITE 13609).pdf||Accepted Manuscript Version||506.9 kB|
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Cationization of agricultural by-products using metal salts is widely used to activate their phosphorous capture ability. This study developed three kinds ofnew metal loaded soybean milk by-product `okara for phosphorus biosorption. A comparative study among these biosorbents was carried out with respect to their performances in terms of affinity, stability and reusability. Zirconium loaded okara (ZLO) was found to have the highest affinity towards PO43- anions (47.88 mg/g), followed by iron/zirconium loaded okara IZLO (40.96 mg/g) and iron loaded okara ILO (16.39 mg/g). ZLO was successfully desorbed with 0.2 M NaOH and activated with 0.1 HCl prior to the next cycle. After five consecutive cycles, the efficiency of both adsorption and desorption of ZLO remained about 85% whilst no Zr(IV) leakage was observed. Conversely, IZLO and ILO suffered from vitalshortcomingssuch ashigh metal release and/or sharp reduction in PO43- sequestering capability after multi operation cycles.
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