Abstract：
:Adsorption uranium [U(VI)] from U-containing radioactive wastewater (URW) is a critical strategy for solving the resource shortage and environmental pollution in pace with the sustainable development of nuclear energy. However, the URW universally exhibits acidity and contains co-existing metal ions with high concentration. Herein, the amidoximation ethylene-acrylic acid copolymer balls (EAA-AO) with aciduric and super-high mechanical property were successfully synthesized through grafting diaminomaleonitrile and further treatment of amidoximation. Significantly, the mechanical properties of EAA-AO were not affected by the grafting process and maintained super-high mechanical properties. Furthermore, the -NH2 and unreacted -CN groups in diaminomaleonitrile adjusted the pKa to make the optimal pH be 4. In addition, the microstructure of EAA-AO was transformed from the original dense to multi-layer porous structure, which promoted the mass transfer process and the contact between uranyl ions (UO22+) and internal adsorption active sites. The adsorption capacity of EAA-AO was about 1.78 times that of EAA at pH = 4, and the adsorption capacity for U(VI) was about 8.17 times that of Ba2+ with the second highest adsorption capacity. Therefore, the EAA-AO exhibited ultra-high adsorption performance (qe = 3.196 mg g-1) in the artificial radioactive wastewater, laying a good foundation for subsequent large-scale industrial adsorption of U(VI) in nuclear industrial wastewater.
journal_name
Chemospherejournal_title
Chemosphereauthors
Wang Y,Lin Z,Liu Q,Zhu J,Liu J,Yu J,Chen R,Liu P,Wang Jdoi
10.1016/j.chemosphere.2021.130722keywords:
["Amidoxime groups","Ethylene-acrylic acid copolymer","Mechanical property","Multi-layer porous structure","Radioactive wastewater"]subject
Has Abstractpub_date
2021-10-01 00:00:00pages
130722eissn
0045-6535issn
1879-1298pii
S0045-6535(21)01193-0journal_volume
280pub_type
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