Li Jiaqi, Wang Mengzhou, Zhao Xu, Li Zitong, Niu Yihui, Wang Sufeng, Sun Qina
Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
Nanomaterials (Basel). 2023 Jan 31;13(3):576. doi: 10.3390/nano13030576.
Iodine is a nuclide of crucial concern in radioactive waste management. Nanomaterials selectively adsorb iodine from water; however, the efficient application of nanomaterials in engineering still needs to be developed for radioactive wastewater deiodination. egg shells possess large surface groups and connecting pores, providing a new biomaterial to remove contaminants. Based on the egg shell-derived biochar (AES biochar) and in situ precipitation and reduction of cuprous, we synthesized a novel nanocomposite, namely porous biochar-confined nano-CuO/Cu (C-Cu). The characterization of C-Cu confirmed that the nano-CuO/Cu was dispersed in the pores of AES biochar, serving in the efficient and selective adsorption of iodide and iodate ions from water. The iodide ion removal by C-Cu when equilibrated for 40 min exhibited high removal efficiency over the wide pH range of 4 to 10. Remarkable selectivity towards both iodide and iodate ions of C-Cu was permitted against competing anions (Cl/NO/SO) at high concentrations. The applicability of C-Cu was demonstrated by a packed column test with treated effluents of 1279 BV. The rapid and selective removal of iodide and iodate ions from water is attributed to nanoparticles confined on the AES biochar and pore-facilitated mass transfer. Combining the advantages of the porous biochar and nano-CuO/Cu, the use of C-Cu offers a promising method of iodine removal from water in engineering applications.
碘是放射性废物管理中备受关注的一种核素。纳米材料能从水中选择性吸附碘；然而，纳米材料在工程中的高效应用仍有待开发，以用于放射性废水脱碘。蛋壳具有大量表面基团和连通孔隙，为去除污染物提供了一种新型生物材料。基于蛋壳衍生生物炭（AES生物炭）以及亚铜的原位沉淀和还原，我们合成了一种新型纳米复合材料，即多孔生物炭限制型纳米CuO/Cu（C-Cu）。C-Cu的表征证实纳米CuO/Cu分散在AES生物炭的孔隙中，可有效且选择性地从水中吸附碘离子和碘酸根离子。C-Cu在40分钟达到平衡时对碘离子的去除在4至10的宽pH范围内表现出高去除效率。在高浓度竞争阴离子（Cl/NO/SO）存在的情况下，C-Cu对碘离子和碘酸根离子均表现出显著的选择性。通过对1279床体积的处理后流出物进行填充柱测试，证明了C-Cu的适用性。从水中快速且选择性地去除碘离子和碘酸根离子归因于限制在AES生物炭上的纳米颗粒以及孔隙促进的传质。结合多孔生物炭和纳米CuO/Cu的优点，使用C-Cu为工程应用中从水中去除碘提供了一种有前景的方法。
