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Adsorption of phosphate from aqueous solution using iron-zirconium modified activated carbon nanofiber: Performance and mechanism

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成果类型:
期刊论文
作者:
Xiong, Weiping;Tong, Jing;Yang, Zhaohui*;Zeng, Guangming*;Zhou, Yaoyu;Wang, Dongbo;Song, Peipei;Xu, Rui;Zhang, Chen;Cheng, Min
通讯作者:
Yang, Zhaohui;Zeng, Guangming
作者机构:
[Yang, Zhaohui; Song, Peipei; Zeng, Guangming; Xu, Rui; Tong, Jing; Zhang, Chen; Wang, Dongbo; Xiong, Weiping; Cheng, Min; Yang, ZH; Zeng, GM] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
[Yang, Zhaohui; Song, Peipei; Zeng, Guangming; Xu, Rui; Tong, Jing; Zhang, Chen; Wang, Dongbo; Xiong, Weiping; Cheng, Min] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.
[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.
通讯机构:
[Yang, ZH; Zeng, GM] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
语种:
英文
关键词:
Phosphate;Adsorption;Iron;Zirconium;Activated carbon nanofiber
期刊:
Journal of Colloid and Interface Science
ISSN:
0021-9797
年:
2017
卷:
493
页码:
17-23
基金类别:
National Natural Science Foundation of China [51521006, 51378190]; Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]; Fundamental Research Funds for the Central Universities
机构署名:
本校为其他机构
院系归属:
资源环境学院
摘要:
Phosphate (P) removal is significant for the prevention of eutrophication in natural waters. In this paper, a novel adsorbent for the removal of P from aqueous solution was synthesized by loading zirconium oxide and iron oxide onto activated carbon nanofiber (ACF-ZrFe) simultaneously. The adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The results showed that P adsorption was highly pH dependent and the optimum pH was found to be 4.0. The isotherm of adsorption could be well described by the Langmuir model and the maximum P adsorption capacity was estimated to be 26.3&nbsp;mg&nbsp;P/g at 25&nbsp;&deg;C. The kinetic data were well fitted to the pseudo-second-order equation, indicating that chemical sorption was the rate-limiting step. Moreover, co-existing ions including sulfate (SO<inf>4</inf><sup>2&minus;</sup>), chloride (Cl<sup>&minus;</sup>), nitrate (NO<inf>3</inf><sup>&minus;</sup>) and fluoride (F<sup>&minus;</sup>) exhibited a distinct effect on P adsorption with the order of F<sup>&minus;</sup>&nbsp;&gt;&nbsp;NO<inf>3</inf><sup>&minus;</sup>&nbsp;&gt;&nbsp;Cl<sup>&minus;</sup>&nbsp;&gt;&nbsp;SO<inf>4</inf><sup>2&minus;</sup>. Further investigations by FT-IR spectroscopy and pH variations associated with the adsorption process revealed that ligands exchange and electrostatic interactions were the dominant mechanisms for P adsorption. The findings reported in this work highlight the potential of using ACF-ZrFe as an effective adsorbent for the removal of P in natural waters. &copy;2017

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