Adsorption of heavy metal ions by carbon-coated iron nanoparticles

CARBON 56 (2013) 392– 395

395

of the ungrooved coating under moist condition,s which can be

Carbon-coated iron nanoparticles were synthesized by a car-

accounted for by a hydrodynamic lubrication mechanism in the

bon arc discharge method using electrodes made of iron and

vicinity of the grooves. The grooves were also a useful surface tex-

graphite powder. The amorphous carbon layer of the carbon-

ture to reduce the friction coefficient of the CDC coating in sliding

coated iron nanoparticles was treated by a 30% H2O2 aqueous solu-

against Si3N4 under dry conditions.

tion. Adsorption of the carbon-coated iron particles for heavy

[New Carbon Materials 2013, 28(1): 71–75]

metal ions, such as Cr, Ni, Cd, Pb, Co and Mn, was studied. Results showed that carboxyl and hydroxyl groups were formed on the

doi:10.1016/j.carbon.2013.01.054

surface of the amorphous carbon layer after the treatment by hydrogen peroxide. In a strong alkaline medium, the hydroxyl and carboxyl groups increased the electrostatic attraction, and

Adsorption

of

heavy

metal

ions

by

carbon-coated

iron

nanoparticles a

a

b

a

Jin-shan Pang , Ai-hua Deng , Ling-bo Mao , Xiao-jun Peng , Jie Zhu a

a

Xinhui Entry–Exit Inspection and Quarantine Bureau, Jiangmen

the adsorption performance of the treated carbon-coated iron particles for heavy metal ions was improved. The removal efficiencies for Cr, Ni, Cd, Pb, Co and Mn by the treated carbon-coated iron nanoparticles were all over 90% in a pH range of 8–10 and their adsorption capacity is much higher than that of activated carbons. [New Carbon Materials 2013, 28(1): 75–80]

529100, China b

School of Materials and Energy, Guangdong University of Technology,

Guangzhou 510000, China

doi:10.1016/j.carbon.2013.01.055