期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 221, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2021.112426
关键词
Adsorption; Biochar; MgO; Pb(II); Cd(II); Eucalyptus
资金
- Guangxi Innovation Research Team Project [2018GXNSFGA281001]
- Guangxi 'Bagui' Scholar Construction Project
- Guangxi Science and Technology Planning Project [GuiKe-AD18126018]
Lead (Pb) and cadmium (Cd) are typical heavy metals in aqueous solution, known to have adverse health effects. Magnesium oxide (MgO) nanoparticles-biochar composites (MBC) show excellent removal efficiency for Pb(II) and Cd(II), with a maximum theoretical adsorbing amount and potential for broad application in wastewater treatment due to low cost and facile preparation.
Lead (Pb) and cadmium (Cd) are considered as a typical heavy metals in aqueous solution, which may pose adverse health effects on human beings. For the removal of these two pollutants, magnesium oxide (MgO) was successfully immobilized onto eucalyptus biochar (BC) matrix via simple and cost-effective pyrolysis process of MgCl2-pretreated eucalyptus biomass under high temperature (500 degrees C). Synthesized MgO nanoparticles-biochar composites (MBC) exhibited superior removal performance for target pollutants, and achieve 99.9% removal efficiency for Pb(II) and Cd(II) at optimum conditions (0.02 g, pH in range of 4-7, and reaction time 120, 240 min). Furthermore, the maximum theoretical adsorbing amount of MBC was 829.11 mg/g for Pb(II) and 515.17 mg/g for Cd(II). Pseudo-second-order model and Langmuir models were well-determined for isotherm and adsorption kinetics. FTIR, XRD, and XPS analysis revealed that precipitation and ion exchange was of great importance for the removal of contaminants. Besides, cation-pi interaction and complexation from the carboncontaining functional groups should not be neglected. Considering the advantage of low-cost, facile preparation, and brilliant adsorption capacity, it is anticipated that MBC has a promising prospect for the broad application in Pb(II)/Cd(II)-containing wastewater treatment.
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