title: Effect of different carbon nanotubes on cadmium toxicity to Daphnia magna: The role of catalyst impurities and adsorption capacity.
abstract: Experiments were conducted to investigate the effect of four different carbon nanotubes single- and multi-walled carbon nanotubes (SWCNTs and MWCNTs) and hydroxylated and carboxylated multi-walled carbon nanotubes (OH-MWCNTs and COOH-MWCNTs) on Cd toxicity to the aquatic organism Daphnia magna. The acute toxicity results indicated that all CNTs could enhance the toxicity of Cd to D. magna. Furthermore, the filtrate toxicity and adsorption tests showed that the toxicity-increasing effect of SWCNTs and MWCNTs in the overall system was mainly caused by catalysts impurities from the pristine CNTs, whereas the greater adsorption of Cd onto OH-MWCNTs (30.52 mg/g) and COOH-MWCNTs (24.93 mg/g) was the key factor contributing to the enhanced toxicity. This result raised a concern that the metal catalyst impurities, adsorption capacities, and accumulation of waterborne CNTs were responsible for the toxicity of Cd to aquatic organism.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Jiangsu, Nanjing, 210023, China.
authors.forename: Xinghao
authors.initials: X
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Jiangsu, Nanjing, 210023, China.
authors.forename: Ruijuan
authors.initials: R
authors.lastname: Qu
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Jiangsu, Nanjing, 210023, China.
authors.forename: Jiaoqin
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Jiangsu, Nanjing, 210023, China.
authors.forename: Zhongbo
authors.initials: Z
authors.lastname: Wei
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Jiangsu, Nanjing, 210023, China.
authors.forename: Liansheng
authors.initials: L
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Jiangsu, Nanjing, 210023, China.
authors.forename: Shaogui
authors.initials: S
authors.lastname: Yang
authors.affiliation: College of Agricultural and Environmental Sciences, Department of Crop and Soil Sciences, University of Georgia, Griffin, GA, 30223, United States.
authors.forename: Qingguo
authors.initials: Q
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Jiangsu, Nanjing, 210023, China. Electronic address: wangzun315cn@163.com.
authors.forename: Zunyao
authors.initials: Z
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D000818:Animals; D002104:Cadmium / Q000633:toxicity*; D002264:Carboxylic Acids / Q000737:chemistry; D002384:Catalysis; D003621:Daphnia / Q000187:drug effects*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013499:Surface Properties; D023382:Toxicity Tests, Acute; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D002264:Carboxylic Acids; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Adsorption; Cadmium toxicity; Carbon nanotubes; Catalysts impurities; Daphnia magna