Preparation of hydroxyapatite nanostructures with different morphologies and adsorption behavior on seven heavy metals ions

Xueyan Zou; Yanbao Zhao; Zhijun Zhang

doi:10.1016/j.jconhyd.2019.103538

Preparation of hydroxyapatite nanostructures with different morphologies and adsorption behavior on seven heavy metals ions

J Contam Hydrol. 2019 Oct:226:103538. doi: 10.1016/j.jconhyd.2019.103538. Epub 2019 Aug 2.

Authors

Xueyan Zou¹, Yanbao Zhao², Zhijun Zhang³

Affiliations

¹ Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475004, China; Engineering Research Center for Nanomaterials Co. Ltd., Henan University, Jiyuan 459000, China; Key Laboratory for Monitor and Remediation of Heavy Metal Polluted Soils of Henan Province, Jiyuan 459000, China; National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China; Collaborative Innovation Center of Nano Functional Materials and Applications of Henan Province, Henan University, Kaifeng 475004, China.
² Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475004, China; Engineering Research Center for Nanomaterials Co. Ltd., Henan University, Jiyuan 459000, China; Key Laboratory for Monitor and Remediation of Heavy Metal Polluted Soils of Henan Province, Jiyuan 459000, China; National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China; Collaborative Innovation Center of Nano Functional Materials and Applications of Henan Province, Henan University, Kaifeng 475004, China. Electronic address: zhaoyb902@henu.edu.cn.
³ Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475004, China; Engineering Research Center for Nanomaterials Co. Ltd., Henan University, Jiyuan 459000, China; Key Laboratory for Monitor and Remediation of Heavy Metal Polluted Soils of Henan Province, Jiyuan 459000, China; National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China; Collaborative Innovation Center of Nano Functional Materials and Applications of Henan Province, Henan University, Kaifeng 475004, China. Electronic address: zhangzj09@126.com.

PMID: 31421452
DOI: 10.1016/j.jconhyd.2019.103538

Abstract

Hydroxyapatite (HAP) nanostructures with different morphologies have been successfully synthesized in a facile method and the pH value of the solution has an important effect on morphology. Among them, the porous HAP nanospheres (NSs) with an average diameter of 76 nm were further employed as adsorbent to remove the heavy metal ions in solution. The BET surface area, pore size and pore volume of porous HAP NSs were 45.3 m²·g^-1, 2.7 nm and 0.23 m³·g^-1, respectively. The ICP results showed that the porous HAP NSs could remove effectively Pb²⁺, Cd²⁺, Cu²⁺, Co²⁺, Ni²⁺, Zn²⁺, Hg²⁺ ions and the maximum adsorption capacity reached 254.90 mg·g^-1. Experimental equilibrium data were also analyzed by the Langmuir and Freundlich models and the best fit was obtained with the Langmuir isotherm equation. The kinetic study indicated that the adsorption of Pb²⁺ ions on porous HAP NSs was almost instantaneous and the maximum adsorption was reached within 20 min. Compared with the pseudo 1st order model, the adsorption kinetic data was well described by the pseudo 2rd kinetic model. In addition, the porous HAP NSs had a good stability and would be a promising nanoadsorbent for heavy metal ions.

Keywords: Adsorption; Heavy metal; Hydroxyapatite; Morphologies; Nanostructured.

MeSH terms

Adsorption
Durapatite
Hydrogen-Ion Concentration
Ions
Kinetics
Metals, Heavy*
Nanostructures*
Water Pollutants, Chemical*

Substances

Ions
Metals, Heavy
Water Pollutants, Chemical
Durapatite