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
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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-≈SO42-.
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