Liangping Xiong,Kai Lyu,Yiyang Zeng,Chuting Yang,Fangting Chi,Sheng Hu,Xinggui Long
Tetravalent metal (e.g., Zr 4+ , Hf 4+ ) phosphonate frameworks featuring remarkable chemical and radiolytic stabilities have been newly utilized as high-performing adsorbents for actinide in harsh solutions. Nevertheless, the practical applications have been impeded by the as-synthesized powder form that is not compatible with continuous actinide recovery or removal. Herein, we incorporate hafnium phosphonate (HfP) fine powder into polyacrylonitrile (PAN) via a simple and economical electrospinning technique, engendering a stable and hydrophilic nanofibrous membrane with the first-rank permeate flux for the potential treatment of a large volume of actinide-containing wastewater. This composite membrane can capture more than 90% Th(IV) at ppm level and 95% Pu(IV) and 90% Np(V) at tracer amount level in strong acidic solutions, which retains the excellent adsorption efficacy of HfP powder. Besides, it has a breakthrough volume larger than 880 mL for Th(IV) and 760 mL for U(VI) at the ppb level under a high permeate flux of 785 ± 11.2 L·m -2 ·h -1 , representing one of the top nanofibrous membranes for the dynamic removal of actinides. This work will pave an avenue for fabricating highly efficient and stable adsorptive membranes, which are promising candidates for capturing actinides from large-volume of acidic nuclear wastewater.
Jinchang Liu,Xiaoya An,Lujie Huang,Haiyan Zhou,Dingcheng Liang,Qiang Xie,Maohong Fan
To enhance the feasibility and cost-effectiveness of hydrometallurgy of spent lithium-ion batteries, it is crucial to achieve the recycling of strong acids employed in electrode dissolution. The current method of directly adding precipitants into strongly acidic electrode filtrate to obtain lithium results in contamination and renders it non-reusable. Therefore, an adsorption method was proposed for the capture and adsorption of lithium-ion from a strongly acidic solution. Subsequently, the porous, magnetic, and spherical carbon adsorbents were used for magnetic separation after reaching saturation during the adsorption process. In this work, the porous carbon beads were prepared using coal tar pitch as a precursor material , and the different magnetization methods of as-prepared carbon beads were investigated, including in-situ and impregnated magnetization. The results demonstrate a significant increase in mesopore volume from 0.0610 cm 3 /g to 0.2120 cm 3 /g by in-situ magnetization, thereby enhancing the availability of transport channels for lithium-ion adsorption. The graphitization degree of porous carbon beads is improved by magnetization, which is attributed to the catalytic graphitization effect of Fe. The I D /I G value of porous carbon beads decreases the most from 2.68 to 2.48 by impregnated magnetization, while the content of iron retained after activation is low, and the remanent magnetism of PCB-FeCl 3 is far less than that of PCB-Fe 3 O 4 (25.1103 emu/g). The result implies that the in-situ magnetization technique enables the utilization of porous carbon beads for magnetic separation recovery technology. The in-situ magnetized porous carbon beads have a high adsorption capacity for lithium-ion (79.8 mg/g) and still maintain excellent adsorption performance after 5 cyclic times of lithium-ion adsorption from a strongly acidic solution.
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