Ion-imprinted thermosensitive chitosan derivative for heavy metal remediation

Pengfei Han; Zhiming Li; Xin Wei; Liwen Tang; Mengting Li; Zhenyi Liang; Xueqiong Yin; Suying Wei

doi:10.1016/j.carbpol.2020.116732

Ion-imprinted thermosensitive chitosan derivative for heavy metal remediation

Carbohydr Polym. 2020 Nov 15:248:116732. doi: 10.1016/j.carbpol.2020.116732. Epub 2020 Jul 18.

Authors

Pengfei Han¹, Zhiming Li¹, Xin Wei², Liwen Tang¹, Mengting Li¹, Zhenyi Liang¹, Xueqiong Yin³, Suying Wei⁴

Affiliations

¹ Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou, Hainan, 570228, PR China.
² Department of Chemistry and Biochemistry, Lamar University, P.O. Box 10022, Beaumont, TX 77710, USA.
³ Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou, Hainan, 570228, PR China. Electronic address: yxq88@hotmail.com.
⁴ Department of Chemistry and Biochemistry, Lamar University, P.O. Box 10022, Beaumont, TX 77710, USA. Electronic address: swei@lamar.edu.

PMID: 32919549
DOI: 10.1016/j.carbpol.2020.116732

Abstract

Ion-imprinted thermosensitive chitosan derivative (ITC) was successfully synthesized through a novel gradient heating process towards applications in heavy metal remediation, using Cu²⁺ template paired with N-isopropylacrylamide (NIPAM) monomer. SEM, DSC, FTIR and Raman spectroscopy were used to characterize the structure and properties of ITC. The phase change temperature (PCT) of ITC was 35.31 °C in the heating cycle, whereas in the cooling cycle the PCT for ITC was 26.27 °C. The adsorption capacity of ITC for Cu²⁺ at 45 °C (> PCT) was 88.94 mg/g. Desorption rate of 98.90 % was achieved after washing with ultra-pure water at 20 °C (< PCT). An adsorption capacity of 85 mg/g and a desorption rate of 97 % sustained after five cycles reuse. The adsorption capacity for Cu²⁺ was measured at 80.23 mg/g under other seven interfering metal ions. The adsorption kinetics and adsorption isotherm fitted pseudo-second-order and Langmuir equation, respectively.

Keywords: Chitosan; Gradient heating process; Heavy metal remediation; Ion imprinting; NIPAM.