Abstract
Chitosan and hydroxyapatite are commonly used materials for adsorption. In this work, chitosan was modified by polyethylene glycol and maleic anhydride. Subsequently, a hydroxyapatite-chitosan composite was synthesised by precipitation. The composite was characterised and analysed by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). Adsorption experiments were used to investigate the effects of external factors such as different pH values, adsorbent dosage, adsorption time and initial nickel ion concentration on the adsorption capacity of Ni2+ and to discuss the mechanism of Ni2+ removal by composites. The results show that the hydroxyapatite-chitosan composite has significant adsorption of Ni2+. The adsorption capacity of the hydroxyapatite-chitosan composite for Ni2+ reaches 63.8 mg g−1. The adsorption process is consistent with the pseudo-second-order kinetic model and the Langmuir isothermal model.
About the authors
Ya Xu is a postgraduate student in Anhui University of Chinese Medicine. Her main fields of research are mass transfer and separation in pharmaceutical processes.
Zheng Ji is a postgraduate student in Anhui University of Chinese Medicine. His main fields of research are mass transfer and separation in pharmaceutical processes.
Yansong Zhang is a postgraduate student in Anhui University of Chinese Medicine. His main fields of research are mass transfer and separation in pharmaceutical processes.
Mengdie Sha was born in 2002. She is an undergraduate studying in Anhui University of traditional Chinese medicine. Her major is pharmaceutical engineering.
Prof.
Chuanrun Li graduated from Nanchang University in1998. His research interests are in the fields of organic substances, fine chemicals and environmental protection.
Prof.
Huchuan Wang is a teacher at Anhui University of Chinese Medicine. His main fields of research are applications of water-soluble polymers in industrial water systems and green chemical.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work is supported by the National Key Research and Development Program of China, No. 2019YFC1711300; Natural Science Foundation of Anhui Province, No. 1808085QH289; Key Project of Natural Science Research of Anhui Universities, No. KJ2020A0432; Quality Project of Higher Education in Anhui Province, No. 2020xfxm35.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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