Citation: ZONG En-Min, WEI Dan, HUAN Zhong-Ke, PENG Du, WAN Hai-Qin, ZHENG Shou-Rong, XU Zhao-Yi. Adsorption of Phosphate by Zirconia Functionalized Multi-walled Carbon Nanotubes[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(5): 965-972. doi: 10.3969/j.issn.1001-4861.2013.00.154 shu

Adsorption of Phosphate by Zirconia Functionalized Multi-walled Carbon Nanotubes

1.
State Key Laboratory of Pollution Control and Resource Reuse, and School of the Environment, Nanjing University, Nanjing 210023, China

Corresponding author: XU Zhao-Yi,
Received Date: 5 December 2012
Available Online: 17 January 2013
Fund Project: 国家自然科学基金(No.21077050, 21277069) (No.21077050, 21277069)教育部“长江学者和创新团队发展计划”(No.IRT1019) (No.IRT1019)国家“863”计划(No.2012AA062607) 和江苏省六大人才高峰项目资助项目。 (No.2012AA062607)

Zirconia functionalized multi-walled carbon nanotubes were successfully synthesized by hydrothermal method and their adsorption behavior for phosphate were also investigated. Characterized results showed that the BET surface areas and the total pore volumes of MWNTs decreased greatly after ZrO₂ functionalization. The average particle size of zirconia that uniformly dispersed on the surface of MWNTs increased with increasing ZrO₂ content. Phosphate adsorption experimental results showed that decreasing ZrO₂ particle size was beneficial to improve the ZrO₂ content-normalized adsorption amount and the adsorption rate. The adsorption isotherm could be well fitted by Freundlich equation which suggested a preferential adsorption, while kinetics followed the pseudo-second-order model. Lower ionic strength and pH were favorable to the removal of phosphate. And the effect of co-existing anions was in the order of F^->NO₃^-≈SO₄^2-.
- multi-walled carbon nanotube;phosphate;adsorption;ZrO₂
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沈阳化工大学材料科学与工程学院沈阳 110142