NDLI: modi fi ed cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions †

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modi fi ed cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions †

Content Provider	Semantic Scholar
Author	Li, Wei-Xue Ju, Benzhi Zhang, Shufen
Copyright Year	2019
Abstract	Using a green biosorbent to remove toxic mercury ions from aqueous solutions is a significant undertaking. In the present study, a novel biosorbent, L-cysteine modified cellulose nanocrystals (Lcys-CNCs), was prepared by functionalizing high surface area cellulose nanocrystals with L-cysteine through periodate oxidation and reductive amination reaction. Lcys-CNCs were characterized by FT-IR, C CP-MAS NMR, elemental analysis, XPS, zeta potential and SEM. As cellulose nanocrystals are the natural nanomaterial, and L-cysteine contains strong mercury chelating groups, Lcys-CNCs show excellent adsorption capacity for mercury ions. The experimental conditions such as pH, contact time, and initial mercury ion concentration are discussed. The pseudo-second order model can describe the removal kinetics of Hg(II) more accurately than the pseudo-first order model. The adsorption isotherm study of Hg(II) followed the Langmuir model of monolayer adsorption. The maximum uptake capacity of Lcys-CNCs was determined to be 923 mg g . Lcys-CNCs can remove mercury ions with 93% removal efficiency within 5 min from a 71 mg L 1 solution. For Cd(II), Pb(II), Cu(II) and Zn(II) ions, Lcsy-CNCs can selectively adsorb Hg(II) ions and the removal efficiency is 87.4% for Hg(II). This study suggests Lcsy-CNCs are a green and highly efficient biosorbent for adsorption of mercury ions from aqueous solutions.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://pubs.rsc.org/en/content/articlepdf/2019/ra/c9ra00048h
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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