TY - JOUR
T1 - Use of nano-/micro-magnetite for abatement of cadmium and lead contamination
AU - Ajmal, Zeeshan
AU - Usman, Muhammad
AU - Anastopoulos, Ioannis
AU - Qadeer, Abdul
AU - Zhu, Runliang
AU - Wakeel, Abdul
AU - Dong, Renjie
N1 - Funding Information:
Financial support of this research has been provided by Grand Challenges Canada–Stars in Global Health (Grant No.: GCC- 0242-01 ).
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/6/15
Y1 - 2020/6/15
N2 - Structural variations of a mineral dictate its adsorption capacity which affects the mobility and toxicity of contaminants in natural and engineered systems. Present batch study evaluates the adsorption of lead (Pb) and cadmium (Cd) onto three magnetites having nanometric (M1-30 nm and M2-60 nm) and micrometric particle sizes (M3-1.5 μm). Obtained data revealed that particle size of tested magnetites strongly affected the extent and kinetics of metal adsorption and desorption. Observed order of adsorption efficiency was M1 > M2 > M3 with optimum monolayer adsorption of 408.14, 331.40, 178.47 mg/g (for Pb) and 228.05, 170.86, 83.49 mg/g (for Cd), respectively. Adsorption data were well fitted to the Freundlich (R2 = 0.99), Langmuir (R2 = 0.99) and pseudo-first order models (R2 = 0.98). Electrostatic attraction and surface precipitation interaction via external mass transfer between bulk liquid-solid interfaces were the potential adsorption pathways. Pb showed higher affinity than Cd in multi-metal system. Desorption efficiency was higher in acidic environment (92%) than in distilled water (44%). Moreover, regenerated magnetite samples retained good adsorption capacity for six cycles. As soils are characterized by large variability of iron minerals, these findings have important implications regarding the transport and immobilization of contaminants particularly in the management of contaminated soils.
AB - Structural variations of a mineral dictate its adsorption capacity which affects the mobility and toxicity of contaminants in natural and engineered systems. Present batch study evaluates the adsorption of lead (Pb) and cadmium (Cd) onto three magnetites having nanometric (M1-30 nm and M2-60 nm) and micrometric particle sizes (M3-1.5 μm). Obtained data revealed that particle size of tested magnetites strongly affected the extent and kinetics of metal adsorption and desorption. Observed order of adsorption efficiency was M1 > M2 > M3 with optimum monolayer adsorption of 408.14, 331.40, 178.47 mg/g (for Pb) and 228.05, 170.86, 83.49 mg/g (for Cd), respectively. Adsorption data were well fitted to the Freundlich (R2 = 0.99), Langmuir (R2 = 0.99) and pseudo-first order models (R2 = 0.98). Electrostatic attraction and surface precipitation interaction via external mass transfer between bulk liquid-solid interfaces were the potential adsorption pathways. Pb showed higher affinity than Cd in multi-metal system. Desorption efficiency was higher in acidic environment (92%) than in distilled water (44%). Moreover, regenerated magnetite samples retained good adsorption capacity for six cycles. As soils are characterized by large variability of iron minerals, these findings have important implications regarding the transport and immobilization of contaminants particularly in the management of contaminated soils.
KW - Adsorption
KW - Magnetite
KW - Metal contamination
KW - Metal immobilization
KW - Nanotechnology
KW - Soil remediation
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U2 - 10.1016/j.jenvman.2020.110477
DO - 10.1016/j.jenvman.2020.110477
M3 - Article
C2 - 32250903
AN - SCOPUS:85082523323
SN - 0301-4797
VL - 264
JO - Journal of Environmental Management
JF - Journal of Environmental Management
M1 - 110477
ER -