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metadata.artigo.dc.title: Cadmium binding mechanisms and adsorption capacity by novel phosphorus/magnesium-engineered biochars
metadata.artigo.dc.creator: Penido, Evanise Silva
Melo, Leônidas Carrijo Azevedo
Guilherme, Luiz Roberto Guimarães
Bianchi, Maria Lucia
metadata.artigo.dc.subject: Poultry litter
Surface functional groups
metadata.artigo.dc.publisher: Elsevier Jun-2019
metadata.artigo.dc.identifier.citation: PENIDO, E. S. et al. Cadmium binding mechanisms and adsorption capacity by novel phosphorus/magnesium-engineered biochars. Science of The Total Environment, [S.l.], v. 671, p. 1134-1143, June 2019.
metadata.artigo.dc.description.abstract: Novel phosphorus/magnesium-engineered biochars were prepared from poultry litter and tested for their Cd2+ retention capacity, unraveling the adsorption mechanisms. Batch experiments were conducted to evaluate the adsorption ability of Cd2+ by biochars and a wide range of characterization techniques were used: scanning electron microscopy with energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, surface area and pore volume, and X-ray photoelectron spectroscopy. Results showed that, in general, Cd2+ removal did not drastically change with initial pH variation and was relatively fast (up to 3 h); the pseudo-second-order kinetic model provided slightly better fitting to the data. Cadmium adsorption capacities of the P/Mg-engineered biochars were much higher than that of the unmodified biochar (up to 113.9 mg g−1), following the SIPS isotherm model. The surfaces of the biochars contain a rich variety of oxygen-containing functional groups as well as phosphate groups. Since the specific surface areas of the biochars are considered low (up to 25.19 m2 g−1), surface groups contributed more to Cd2+ retention. Biochars can be represented by type II isotherms with significant type H3 hysteresis patterns, which suggest the presence of asymmetrically slit-shaped pores. Complexation and precipitation were the predominant adsorption mechanisms. Thus, P/Mg-engineered biochars produced from poultry litter are considered effective and eco-friendly adsorbents for Cd2+ removal from aqueous medium, especially PLB-H3PO4-MgO, which is produced from low-cost materials.
metadata.artigo.dc.language: en_US
Appears in Collections:DCS - Artigos publicados em periódicos
DQI - Artigos publicados em periódicos

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