期刊名称：Journal of Radiation Research and Applied Sciences
印刷版ISSN：1687-8507
出版年度：2020
卷号：13
期号：1
页码：343-355
DOI：10.1080/16878507.2020.1740394
出版社：Elsevier B.V.
摘要：Biochar is a promising metal-immobilizing material, nevertheless the studies of its modification and application in the removal of radionuclides, especially 137Cs from contaminated liquids remain rare. This research demonstrated that horticultural waste derived biochar (GWB) produced by slow pyrolysis process could be a suitable Cs adsorbent and also useful support to impregnate the potassium nickel(II) hexacyanoferrate(III) (KNi-HCF). Porous materials combining sorption properties of biochar carrier and KNi-HCF have been prepared using simple and efficient impregnation method. The obtained materials (GWB, KNi-HCF-GWB1, and KNi-HCF-GWB2) have been characterized using N2 adsorption method, SEM-EDX, and FTIR analysis. Compared to GWB, both KNi-HCF biochars showed improved adsorption properties toward Cs+ ions, e.g. rapid kinetics, high Cs adsorption capacities (140 ± 3 μmol g−1 for KNi-HCF-GWB1 and 290 ± 9 μmol g−1 for KNi-HCFGWB2), and high Kd values even in the presence of excess of monovalent (Na+ + K+ + NH4 + ) and divalent (Ca2+ + Mg2+ + Sr2+) cations. High adsorption capacities could be related to synergistic effects of Cs+ ion-exchange with KNi[Fe(CN)6] structure and other mechanisms described for unmodified GWB. Rapid adsorption kinetics and high Cs adsorption capacity indicate the suitability of KNi-HCF biochars to treat large volumes of 137Cs contaminated liquids..
