Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, Nanchang, 330013, Jiangxi, China.
Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, Nanchang, 330013, Jiangxi, China.
Appl Radiat Isot. 2022 Dec;190:110512. doi: 10.1016/j.apradiso.2022.110512. Epub 2022 Oct 17.
The adsorption and recovery of uranium from wastewater is of positive significance to the development of nuclear industry and environmental remediation. The ternary polymer (PZS-co-TA) was prepared from hexachlorocyclotriphosphazene (HCCP), 4,4-sulfonyldiphenol (BPS) and tannic acid (TA) under ultrasonic. TAC was then obtained after carbonization under high temperature from PZS-co-TA. The structure and performance of TAC were analyzed using SEM, EDS, FT-IR, XRD, Raman, BET and TG. The adsorption capacity of TAC for uranium under different static adsorption conditions was investigated. The adsorption process was more consistent with pseudo-second-order model. The maximum adsorption capacity calculated by non-linear Langmuir model was 492.5 mg/g at pH 5.5. The thermodynamic values suggested that the adsorption process was spontaneous and endothermic. Moreover, after five cycles of adsorption-desorption tests, TAC remained effective at adsorbing uranium, implying the introducing of TA to the precursor (PZS-co-TA) could enhance the adsorption capacity for uranium.
从废水中吸附和回收铀对核工业的发展和环境修复具有积极意义。采用超声技术，由六氯环三磷腈（HCCP）、4,4-磺酰基二苯酚（BPS）和没食子酸（TA）制备了三元聚合物（PZS-co-TA）。然后，通过高温碳化从 PZS-co-TA 得到 TAC。采用 SEM、EDS、FT-IR、XRD、Raman、BET 和 TG 对 TAC 的结构和性能进行了分析。考察了不同静态吸附条件下 TAC 对铀的吸附容量。吸附过程更符合准二级模型。在 pH 5.5 时，非线性 Langmuir 模型计算的最大吸附容量为 492.5mg/g。热力学值表明吸附过程是自发的和吸热的。此外，经过五次吸附-解吸循环试验后，TAC 仍能有效地吸附铀，这表明在前驱体（PZS-co-TA）中引入 TA 可以提高其对铀的吸附能力。
