title: Feasibility of iron loaded 'okara' for biosorption of phosphorous in aqueous solutions.
abstract: This study investigated the feasibility of using soybean milk by-products (okara) as a sustainable biosorbent for phosphate removal in water and wastewater. The results show that raw okara could hardly decontaminate phosphate from aqueous solutions. Hence, in this work, okara was modified by being cationized using FeCl3 0.25 M (namely iron loaded okara, ILO) to enhance the phosphorus adsorption capacity. The phosphate sorption onto ILO was well achieved under the conditions of pH 3, initial phosphorous concentration of 25 mg/L, biosorbent dose of 20 mg/L and contact time of 7 h. Based on Langmuir model, the maximum adsorption capacity of phosphate by ILO was 4.785 mg/g. The effects of interfering anions were in the order of CO3(2-)>SO4(2-)>NO3(-). It was also observed that Fe(III) was detached during operation. This problem can hinder the sustainable usability of ILO. Thus, further research would be necessary for improving the modification method.
authors.affiliation: Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney, Broadway NSW 2007, Australia.
authors.forename: T A H
authors.initials: TA
authors.lastname: Nguyen
authors.forename: H H
authors.initials: HH
authors.lastname: Ngo
authors.forename: W S
authors.initials: WS
authors.lastname: Guo
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: S
authors.initials: S
authors.lastname: Liang
authors.forename: K L
authors.initials: KL
authors.lastname: Tung
mesh_terms: D000327:Adsorption; D000838:Anions; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D008670:Metals / Q000737:chemistry; D010710:Phosphates / Q000302:isolation & purification; D010758:Phosphorus / Q000302:isolation & purification*; D010940:Plant Proteins / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*; D012996:Solutions; D045730:Soy Foods; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000838:Anions; D007501:Iron; D008670:Metals; D010710:Phosphates; D010758:Phosphorus; D010940:Plant Proteins; D011134:Polysaccharides; D012996:Solutions; D062065:Wastewater; D014874:Water Pollutants, Chemical; C412882:okara, Glycine max
keywords: Adsorption capacity; Cationization; Iron loaded okara; Phosphate removal