Mechanism of orthophosphate (PO4-P) adsorption onto different biochars

Show simple item record Eduah, J.O. Nartey, E.K. Abekoe, M.K. Henriksen, S.W. Andersen, M.N. 2020-01-09T10:04:16Z 2020-01-09T10:04:16Z 2019-12-04
dc.description Research Article en_US
dc.description.abstract The adsorption mechanisms of phosphate (PO4-P) onto cocoa pod husk (CP), corn cob (CC), rice husk (RH) and palm kernel shell (PK) biochar pyrolyzed at 300 ◦C and 650 ◦C were investigated. A series of batch experiments were undertaken to assess the effects of contact time and pH. Results show that PO4-P adsorption equilibria for the biochar types was within 6–15 h, being rapid in the 300 ◦C-biochar types. The equilibrium pH for maximum PO4-P adsorption varied among biochar types, ranging from of 2.6 to 4.8 and increasing with decreasing PO4-P adsorption. Pseudo-secondorder and Elovich models explained the adsorption data well indicating a chemisorption process on heterogeneous biochar surface. PO4-P adsorption was controlled initially by intraparticle diffusion and subsequently by chemisorption. Per the properties of the biochars (FTIR and elemental composition) and pH (equilibrium pH and ΔpH), PO4–P was adsorbed through electrostatic attraction, surface precipitation and ligand exchange, and the relative importance of these processes differed among the biochar types. Biochar types (PK300, PK650, CP300, CP650, RH650 and CC650) that adsorbed PO4-P through surface precipitation and ligand exchange reactions can be used to remove PO4-P from wastewater since PO4-P is strongly adsorbed, controlling PO4-P enrichment of water bodies. en_US
dc.description.sponsorship Danida (Ministry of Foreign Affairs of Denmark) under the project ‘‘Green Cohesive Agricultural Resource Management, WEBSOC’’, DFC project no: 13-01AU. en_US
dc.language.iso en en_US
dc.publisher Environmental Technology & Innovation en_US
dc.relation.ispartofseries 17;2020
dc.subject Biochar en_US
dc.subject Phosphate en_US
dc.subject Adsorption mechanism en_US
dc.subject Models en_US
dc.title Mechanism of orthophosphate (PO4-P) adsorption onto different biochars en_US
dc.type Article en_US

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