Efficient performance of magnesium oxide loaded biochar for the significant removal of Pb2+ and Cd2+ from aqueous solution

Ecotoxicology and Environmental Safety

Asfandyar Shahab¹  Honghu Zeng²  Aziz-Ur-Rahim Bacha³  Qingliang Shi⁴  Jamil Siddique⁴  Hua Zhang⁴  Huiting Zeng⁴  Iqra Nabi⁴  Habib Ullah⁵ 

[1] Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst, Area, Guilin University of Technology, Guilin 541004, China;Corresponding author at: Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China.;Corresponding author.;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China;;Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science &

关键词: Adsorption;    Biochar;    MgO;    Pb(II);    Cd(II);    Eucalyptus;   

DOI  :  

来源: DOAJ

【 摘 要 】

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 °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-π interaction and complexation from the carbon-containing 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.

【 授权许可】

Unknown