Synergistic removal of U(VI) from aqueous solution by TAC material: Adsorption behavior and mechanism. (December 2022)

• Record Type: Journal Article
• Authors: Bao, Yunyun; Liu, Yan; Wang, Changfu; Wang, Yun; Yuan, Dingzhong; Xu, Jianda; Zhu, Zuqing; He, Yan; Liu, Jinbiao
• Is Part Of: Applied radiation and isotopes. Volume 190(2022)
• Publication Date: 2022-12
• Subjects: Polyphosphazene -- Tannic acid -- Carbon materials -- Uranium -- Adsorption; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2022.110512
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: 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. Graphical abstract: Image 1 Highlights: N, P, S and O co-doped carbon material (TAC) were successfully synthesized using ternary polymer (PZS-co-TA) as precursor. N, P, S and O elements displayed a synergistic effect to promote the binding of TAC to uranyl ions. The adsorption capacity of uranium (VI) on TAC was 492.5 mg/g at pH 5.5 calculated by nonlinear Langmuir model. The U(VI) removal mechanism of TAC was researched.