Production of engineered-biochar under different pyrolysis conditions for phosphorus removal from aqueous solution.

Autor: Nardis BO; Department of Soil Science, School of Agricultural Sciences, Federal University of Lavras, 37200-900 Lavras, Minas Gerais, Brazil., Franca JR; Department of Physics, Institute of Natural Sciences, Federal University of Lavras, 37200-900 Lavras, Minas Gerais, Brazil., Carneiro JSDS; Department of Soil Science, School of Agricultural Sciences, Federal University of Lavras, 37200-900 Lavras, Minas Gerais, Brazil., Soares JR; Department of Physics, Institute of Natural Sciences, Federal University of Lavras, 37200-900 Lavras, Minas Gerais, Brazil., Guilherme LRG; Department of Soil Science, School of Agricultural Sciences, Federal University of Lavras, 37200-900 Lavras, Minas Gerais, Brazil., Silva CA; Department of Soil Science, School of Agricultural Sciences, Federal University of Lavras, 37200-900 Lavras, Minas Gerais, Brazil., Melo LCA; Department of Soil Science, School of Agricultural Sciences, Federal University of Lavras, 37200-900 Lavras, Minas Gerais, Brazil. Electronic address: leonidas.melo@ufla.br.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 Apr 10; Vol. 816, pp. 151559. Date of Electronic Publication: 2021 Nov 13.
DOI: 10.1016/j.scitotenv.2021.151559
Abstrakt: Phosphorus (P) recovery from wastewater through biochar is an alternative to build a sustainable circular economy and save non-renewable P reservoirs. The efficiency of cations in removing P from wastewater under different pyrolysis conditions is still lacking. We aimed at studying P adsorption and release from biochar enriched with Al 3+ and Mg 2+ , prepared under air-limited and N 2 -flow pyrolysis conditions. Biochar samples were produced from pig manure (PMB) and impregnated, separately, with 20% of AlCl 3 and MgCl 2 solutions on both pyrolysis conditions. The materials were characterized for pH, electrical conductivity (EC), total nutrient content, ash, specific surface area (SSA), pore-volume, FTIR, XRD, and SEM-EDX. Phosphorus adsorption was studied by kinetics and adsorption isotherms, as well as desorption. The biochar impregnated with Mg 2+ and produced in the muffle furnace achieved the maximum P adsorption (231 mg g -1 ), and 100% of the adsorbed P was released in solutions of Mehlich-1 and citric acid 2%. The pyrolysis conditions had a small or no influence on the biochar properties governing P adsorption, such as chemical functional groups, surface area, quantity and size of pores, and formation of synthetic minerals. Therefore, it is possible to produce biochar without using N 2 as a carrier gas when it comes to P adsorption studies. Mechanisms of P removal comprise precipitation with cations, surface complexation, ligand exchange reactions, and electrostatic attraction on the biochar surface. Overall, Mg-impregnated biochar is a suitable matrix to remove P from aqueous media and to add value to organic residues while producing an environmentally friendly material for reuse in soils.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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