title: Recovery of phosphate from aqueous solution by magnesium oxide decorated magnetic biochar and its potential as phosphate-based fertilizer substitute.
abstract: The present study deals with the preparation of a novel MgO-impregnated magnetic biochar (MMSB) for phosphate recovery from aqueous solution. The MMSB was evaluated against sugarcane harvest residue biochar (SB) and magnetic biochar without Mg (MSB). The results showed that increasing Mg content in MMSB greatly improved the phosphate adsorption compared to SB and MSB, with 20% Mg-impregnated MMSB (20MMSB) recovering more than 99.5% phosphate from aqueous solution. Phosphate adsorption capacity of 20MMSB was 121.25mgP/g at pH 4 and only 37.53% of recovered phosphate was desorbed by 0.01mol/L HCl solutions. XRD and FTIR analysis showed that phosphate sorption mechanisms involved predominately with surface electrostatic attraction and precipitation with impregnated MgO and surface inner-sphere complexation with Fe oxide. The 20MMSB exhibited both maximum phosphate sorption and strong magnetic separation ability. Overall, phosphate-loaded 20MMSB significantly enhanced plant growth and could be used as a potential substitute for phosphate-based fertilizer.
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; School of Plant, Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA.
authors.forename: Ronghua
authors.initials: R
authors.lastname: Li
authors.affiliation: School of Plant, Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA. Electronic address: JJWang@agcenter.lsu.edu.
authors.forename: Jim J
authors.initials: JJ
authors.lastname: Wang
authors.affiliation: School of Plant, Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA.
authors.forename: Baoyue
authors.initials: B
authors.lastname: Zhou
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Department of Biotechnology, Amicable Knowledge Solution University, Satna, India.
authors.forename: Mukesh Kumar
authors.initials: MK
authors.lastname: Awasthi
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Amjad
authors.initials: A
authors.lastname: Ali
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Zengqiang
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Altaf Hussain
authors.initials: AH
authors.lastname: Lahori
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Amanullah
authors.initials: A
authors.lastname: Mahar
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D005308:Fertilizers / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008277:Magnesium Oxide / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry / Q000302:isolation & purification*; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D005308:Fertilizers; D010710:Phosphates; D012996:Solutions; D014874:Water Pollutants, Chemical; C540010:biochar; D002606:Charcoal; D008277:Magnesium Oxide
keywords: Adsorption; Fertilizer; Magnetic biochar; MgO-impregnation; Phosphate