Preparation and properties of a novel macro porous Ni2+-imprinted chitosan foam adsorbents for adsorption of nickel ions from aqueous solution

Na Guo; Shi-Jun Su; Bing Liao; Sang-Lan Ding; Wei-Yi Sun

doi:10.1016/j.carbpol.2017.02.056

Preparation and properties of a novel macro porous Ni²⁺-imprinted chitosan foam adsorbents for adsorption of nickel ions from aqueous solution

Carbohydr Polym. 2017 Jun 1:165:376-383. doi: 10.1016/j.carbpol.2017.02.056. Epub 2017 Feb 17.

Authors

Na Guo¹, Shi-Jun Su¹, Bing Liao¹, Sang-Lan Ding¹, Wei-Yi Sun²

Affiliations

¹ College of Architecture and Environment, Sichuan University, Chengdu, 610065, China.
² College of Architecture and Environment, Sichuan University, Chengdu, 610065, China. Electronic address: swylscu@163.com.

PMID: 28363562
DOI: 10.1016/j.carbpol.2017.02.056

Abstract

In this study, novel macro porous Ni²⁺-imprinted chitosan foam adsorbents (F-IIP) were prepared using sodium bicarbonate and glycerine to obtain a porogen for adsorbing nickel ions from aqueous solutions. The use of the ion-imprinting technique for adsorbents preparation improved the nickel ion selectivity and adsorption capacity. We characterised the imprinted porous foam adsorbents in terms of the effects of the initial pH value, initial metal ion concentration, and contact time on the adsorption of nickel ions. The adsorption process was described best by Langmuir monolayer adsorption models, and the maximum adsorption capacity calculated from the Langmuir equation was 69.93mgg^-1. The kinetic data could be fitted to a pseudo-second-order equation. Our analysis of selective adsorption demonstrated the excellent preference of the F-IIP foams for nickel ions compared with other coexisting metal ions. Furthermore, tests over five cycle runs suggested that the F-IIP foam adsorbents had good durability and efficiency.

Keywords: Chitosan foam; Ion imprinting; Nickel ion.