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Immobilization of nano-zero-valent irons by carboxylated cellulose nanocrystals for wastewater remediation

Frontiers of Chemical Science and Engineering 2020年第6期14卷 1006-1017页

作者： Bangxian Peng Rusen Zhou Ying Chen Song Tu Yingwu Yin Liyi Ye Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQLD 4000Australia

Nano-zero-valent irons(nZVI)have shown great potential to function as universal a nd low-cost magnetic ***,the rapid agglomeration and easy surface corrosion of nZVI in solution greatly hinders their overall ***,carboxylated cellulose nanocrystals(CCNC),widely available from renewable biomass resources,wer e prepared and applied for the immobilization of *** doing so,carboxylated cellulose nanocrystals supporting nano-zero-valent irons(CCNC-nZVI)were obtained via an in-situ growth *** CCNC-nZVI were characterized and then evaluated for their performances in wastewater *** results obtained show that nZVI nanoparticles could attach to the carboxyl and hydroxyl groups of CCNC,and well disperse on the CCNC surface with a size of〜*** the CCNC acting as corrosion inhibitors improving the reaction activity of nZVI,CCNC-nZVI exhibited an improved dispersion stability and electron utilization *** Pb(II)adsorption capacity of CCNC-nZVI reached 509.3 mg·g^-1(298.15 K,pH=4.0),significantly higher than that of *** adsorption was a spontaneous exothermic process and could be perfectly fitted by the pseudo-second-order kinetics *** study may provide a novel and green method for immobilizing magnetic nanomaterials by using biomassbased resources to develop effective bio-adsorbents for wastewater decontamination.

关键词： carboxylated cellulose nanocrystals nanozero-valent irons magnetic bio-adsorbents wastewater remediation

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