Poly( N -acryloyl- l -histidine)-modified wood sawdust as an efficient adsorbent for low-level heavy metal ions
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ORIGINAL RESEARCH
Poly(N-acryloyl-L-histidine)-modified wood sawdust as an efficient adsorbent for low-level heavy metal ions Jianwei Guo . Xiao Liu . Miaomiao Han . Yadong Liu . Shengxiang Ji
Received: 23 March 2020 / Accepted: 10 July 2020 Ó Springer Nature B.V. 2020
Abstract An amphoteric metal adsorbent, poly(Nacryloyl-L-histidine)-modified sawdust (SD-g-P(AHis)), is prepared by reversible addition–fragmentation chain transfer (RAFT) polymerization of Nacryloyl-L-histidine from modified sawdust. SD-gP(A-His) possess imidazolyl and carboxyl groups and shows outstanding adsorption performance for heavy metals. The adsorption capacities of SD-g-P(A-His) are 241.8 and 95.7 mg/g for Pb(II) and Cu(II), respectively. Ten tested metal ions, e.g. Au(III), Cr(III), Cu(II), Fe(III), Ni(II), Pb(II), Pd(II), Hg(II), Mg(II) and Zn(II), can be effectively removed from
the multi-metal solution at pH [ 2.7, while Au(III) and Pd(II) can be selectively recycled from the multimetal solution by lowering the pH to B 1.0. The adsorption kinetics of Pb(II) and Cu(II) onto SD-gP(A-His) fit well with the pseudo-second order model. SD-g-P(A-His) can treat the water with low concentration of metal ions down to sub-10 lg/L level to meet the Quality Standards for Drinking Water of China. Moreover, SD-g-P(A-His) can be recycled and maintain high adsorption efficiency (91.5%) even after 5 cycles.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03347-8) contains supplementary material, which is available to authorized users. J. Guo X. Liu M. Han Y. Liu (&) S. Ji (&) Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China e-mail: [email protected] S. Ji e-mail: [email protected] J. Guo X. Liu S. Ji University of Science and Technology of China, Hefei 230026, China
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Cellulose
Graphic abstract
Keywords Wood sawdust L-Histidine Adsorption Heavy metal ions Abbreviations SD-g-P(APoly(N-acryloyl-L-histidine)-modified His) sawdust RAFT Reversible addition–fragmentation chain transfer EHL-Gly Lignin grafted with glycine EHL-Cys Lignin grafted with cysteine SD Birch sawdust P(A-His) Poly(N-acryloyl-L-histidine) AIBN 2,20 -Azobis(isobutyronitrile) EDTA Ethylene diamine tetraacetic acid CTA Chain transfer agent DDACl S-1-dodecyl-S0 -(a,a0 -dimethyl-a00 acetyl chloride)trithiocarbonate FT-IR Fourier transform infrared D 2O Deuterium oxide ICP-MS Inductively coupled plasma mass spectrometry ICP-OES Inductively coupled plasma optical emission spectrometer SD-CTA Sawdust based macroinitiator
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QSDW
Quality standards for drinking water of China
Introduction Heavy metal pollution is becoming one of the major environmental problems. Most heavy metals are toxic even at very low concentrations of 0.01–0.1 mg/L (Alkorta et al. 2004). A significant amount of metals can be accumulated in organisms through the food chain, which causes many diseases (Papa
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