碳纳米管/羟基磷灰石复合材料对水体F<sup>-</sup>的去除研究

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Abstract

To improve the removal efficiency of fluoride ion (F^-) in aqueous solution, Carbon nanotubes (CNT)-doped hydroxyapatite (HAP) composites (CdH) were synthesized via in-situ synthesis and characterized by XRD, FTIR, SEM and N₂ adsorption-desorption isotherms. The adsorption performance was investigated by static adsorption experiments and analyzed with adsorption kinetic models, Langmuir and Freundlich isotherm adsorption models, and Weber-Morris equation. The optimal pH value for fluoride removal was 6. The adsorption capacity of CdH reached 11.05mg/g at room temperature, which was much higher than that of HAP (5.02mg/g). The results implied the occurrence of Langmuir monolayer adsorption once F^- contacted the surface of CdH. The adsorption kinetics fitted the pseudo-second order model, and the internal diffusion of particles played the major role in the adsorption process. Moreover, the XPS results of CdHs before and after fluoride adsorption demonstrated that the mechanism of fluoride removal by CdH is mainly ion exchange.

Key words： carbon nanotubes hydroxyapatite defluorination ion exchange mechanism

Received: 22 May 2018

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X703

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	Articles by authors
	ZHANG Ping
	YANG Chen-kai
	MA Ruo-nan
	TANG Qing-zi
	WU Dai-she

Cite this article:

ZHANG Ping,YANG Chen-kai,MA Ruo-nan等. Effective Removal of Fluoride by carbon nanotubes/hydroxyapatite composites[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 179-187.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I1/179

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