Novel Hydroxyapatite Beads for the Adsorption of Radionuclides from Decommissioned Nuclear Power Plant Sites

被引:18
作者
Tran, Thi Nhung [1 ]
Kim, Junho [1 ]
Park, Joo-Sung [1 ]
Chung, Youngkun [1 ]
Han, Jaemun [2 ]
Oh, Seungjun [2 ]
Kang, Seoktae [1 ]
机构
[1] Korea Adv Inst Sci & Technol KAIST, Dept Civil & Environm Engn, 291 Daehak Ro, Daejeon 34141, South Korea
[2] Hyundai Engn & Construct, Hyundai Bldg 75, Seoul 03058, South Korea
来源
APPLIED SCIENCES-BASEL | 2021年 / 11卷 / 04期
关键词
adsorption; cobalt; hydroxyapatite; isotherms; kinetics; thermodynamics; radionuclides;
D O I
10.3390/app11041746
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Although a powdered form of hydroxyapatite (p-HdA) has been studied for the adsorption of heavy metals that contaminate the restoration sites of decommissioned nuclear power plants, most of the studies are limited in the laboratory due to the head loss and post-separation in practical applications. Herein, we fabricated a porous bead form of HdA (b-HdA) as a novel adsorbent for removing radionuclides from aqueous environments via a facile synthesis by mixing the p-HdA precursor and polyvinyl butyral (PVB) as a binder and added a sintering process for the final production of a porous structure. The spherical b-HdA with an approximate diameter of 2.0 mm was successfully fabricated. The effectiveness of the b-HdA at removing Co(II) was investigated via the adsorption equilibrium at various experimental temperatures. The b-HdA exhibited the adsorption capacity for Co(II) ions with a maximum of 7.73 and 11.35 mg/g at 293 K and 313 K, respectively. The experimental kinetic data were well described using a pseudo-second-order kinetic model, and the adsorption mechanisms of Co(II) onto the b-HdA were revealed to be a chemisorption process with intraparticle diffusion being the rate-limiting step. In addition, the competitive adsorption onto the b-HdA with the order of U(VI) > Co(II) > Ni(II) > Sr(II) > Cs(I) was also observed in the multi-radionuclides system. Considering the advantages of the size, applicability to the continuous-flow column, and the easy separation from treated water, the b-HdA can be an excellent absorbent with high potential for practical applications for removing radionuclides.
引用
收藏
页码:1 / 13
页数:13
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