U(VI) adsorption onto covalent organic frameworks-TpPa-1

• Published in: Journal of solid state chemistry Vol. 277; pp. 484 - 492
• Main Authors: Li, Zhuo Dai, Zhang, Huai Qiang, Xiong, Xiao Hong, Luo, Feng
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.09.2019
• Subjects: Adsorption; COF-TpPa-1; Covalent organic framework; Desorption; U(VI); Covalent organic framework; U(VI); Desorption; Adsorption; COF-TpPa-1
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2019.06.044

Covalent organic frameworks (COFs) represent an exciting new type of porous organic materials, which are constructed with organic building units via strong covalent bonds. Here in, the COF-2,4,6-Triformylphloroglucinol p-Phenylenediamine (COF-TpPa-1) was synthesized by solvothermal method for the removal of U(VI) from aqueous solution. Effects of pH, adsorption dose, contact time, uranium solution concentration, temperature and adsorption and desorption cycle on the efficiency of COF-TpPa-1 removal of U(VI) are investigated. SEM, XRD, TGA and FT-IR were employed to characterize the samples and analyze adsorption mechanism. The results manifested COF-TpPa-1 has the high adsorption capacity (qm = 152 mg/g), quick adsorption kinetic, high selectivity, outstanding recycle performance and good resistance to acids, bases and high temperature. [Display omitted] Covalent organic frameworks (COFs) represent an exciting new type of porous organic materials, which are constructed with organic building units via strong covalent bonds. In this study, the COF-2,4,6-Triformylphloroglucinol p-Phenylenediamine (COF-TpPa-1) was synthesized by solvothermal method for the removal of U(VI) from aqueous solution. The results manifested COF-TpPa-1 has the high adsorption capacity (qm = 152 mg/g), quick adsorption kinetic, high selectivity, outstanding recycle performance and good resistance to acids, bases and high temperature. •The covalent organic frameworks-2,4,6-Triformylphloroglucinol p-Phenylenediamine (COF-TpPa-1) was synthesized by solvothermal method, and applied in the removal of U(VI) from aqueous solution.•COF TpPa-1 owns dramatic chemical stability (in 6 M HCl, 6 M NaOH, 1 M HNO3 and 100 °C soaked for 3 days keeping intact structure).•This material owns high adsorption capacity (qm = 152 mg/g) and excellent recycle performance (almost unchanged removal rate after four adsorption and desorption cycles).