Zhou Shiping, Dong Faqin, Qin Yilin
School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China.
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Mianyang 621010, China.
Polymers (Basel). 2023 Jan 5;15(2):279. doi: 10.3390/polym15020279.
In this study, we analyzed the removal efficiency of uranium(U(VI)) in wastewater at relatively low concentrations using strong alkaline ion exchange fiber (SAIEF). Static tests showed that the strong alkali fibers can purify U(VI) containing wastewater in a concentration range of 20-100 mg L with an optimal pH of 10.5 and contact time of 15-30 min. Adsorption and desorption cycling tests indicated that, adsorbed uranium is easily desorbed by 0.1 mol L HCl, and the fiber still maintained the original adsorption efficiency after eight cycles. According to dynamic penetration test results, the SAIEF saturation adsorption capacity was 423.9 mg g, and the effluent concentration of uranium through two series columns was less than 0.05 mg L, reaching the national standard for non-receiving water (GB23727-2009) SEM-EDS and FTIR analysis revealed that the functional group of SAIEF is CHN(CH)Cl. Addotionally, the major forms of fiber exchange adsorption are (UO)CO(OH), UO(CO) and UO(OH). The results indicate that the SAIEF is an excellent material for uranium removal.
在本研究中，我们使用强碱性离子交换纤维（SAIEF）分析了其对低浓度废水中铀（U(VI)）的去除效率。静态试验表明，强碱性纤维能够净化浓度范围为20 - 100 mg/L的含U(VI)废水，最佳pH值为10.5，接触时间为15 - 30分钟。吸附和解吸循环试验表明，吸附的铀很容易被0.1 mol/L的HCl解吸，并且纤维在八个循环后仍保持原来的吸附效率。根据动态穿透试验结果，SAIEF的饱和吸附容量为423.9 mg/g，通过两个串联柱的铀流出浓度小于0.05 mg/L，达到国家非受纳水体标准（GB23727 - 2009）。扫描电子显微镜-能谱（SEM - EDS）和傅里叶变换红外光谱（FTIR）分析表明，SAIEF的官能团为CHN(CH)Cl。此外，纤维交换吸附的主要形式为(UO)CO(OH)、UO(CO)和UO(OH)。结果表明，SAIEF是一种优异的铀去除材料。
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