Competitive adsorption of heavy metal ions on carbon nanotubes and the desorption in simulated biofluids.
Carbon nanotubes (CNTs) had meaningful adsorption capacities for Pb(2+), Cu(2+), Zn(2+) and Cd(2+), while Pb(2+) showed the highest adsorption in the competitive adsorption evaluations. The desorption behaviors of heavy metal ions were completely different in various biofluids, where the desorption was significantly influenced by pH and the presence of proteins/other cations. The desorption was most effective in simulated stomach juice, and much less effective in other simulated biofluids. More Pb(2+) stuck to CNTs than others, resulting in less desorption. Interestingly, the competitive desorption behaviors of four ions were largely changed comparing to the individual desorption behaviors. The implications to the biosafety evaluations and synergistic effects of CNT are discussed.
Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, China.
Xin
X
Ma
College of Chemistry and Environment Protection Engineering, Southwest University for Nationalities, Chengdu 610041, China.
Sheng-Tao
ST
Yang
Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Huan
H
Tang
Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, China; Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Yuanfang
Y
Liu
Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, China. Electronic address: hwang@shu.edu.cn.
Haifang
H
Wang
D000327:Adsorption; D000818:Animals; D002417:Cattle; D005750:Gastric Juice / Q000737:chemistry; D006801:Humans; D007419:Intestinal Secretions / Q000737:chemistry; D007477:Ions / Q000302:isolation & purification; D019216:Metals, Heavy / Q000302:isolation & purification*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D012710:Serum Albumin, Bovine / Q000737:chemistry
D007477:Ions; D019216:Metals, Heavy; D037742:Nanotubes, Carbon; D012710:Serum Albumin, Bovine
Adsorption; Biofluid; Carbon nanotubes; Desorption; Synergistic effect; Toxicity