Abstract
Adsorbents capable of rapidly and efficiently adsorbing specific metal ions in solution are critical in emergency disposal and waste minimization of radioactive effluents. A microporous zeolitic imidazole framework-90 belonging to metal-organic frameworks (MOFs) was synthesized and functionalized with methionine and lysine to obtain ZIF-90-Met and ZIF-90-Lys with efficient and selective adsorption of cobalt ions. The synthesized materials were characterized by means of SEM, TGA, N2 adsorption–desorption, XRD and FTIR. The adsorption properties of two materials for Co(II) in simulated waste liquid were investigated. Under the conditions of pH = 6.69, T = 303 K and initial concentration of 500.00 mg·L−1, the maximum adsorption capacity of Co(II) on ZIF-90-Met and ZIF-90-Lys were 136.83 mg·g−1 and 164.40 mg·g−1, respectively. Two materials exhibit high selectivity in the adsorption of Co(II) and Ni(II) in multimetal ion solutions. Kinetic and adsorption isotherm analysis showed that the adsorption of Co(II) by ZIF-90-Met and ZIF-90-Lys was consistent with pseudo-second-order chemisorption and Langmuir monolayer adsorption. Thermodynamic analysis shows that the adsorption process of Co(II) by ZIF-90-Met and ZIF-90-Lys is spontaneous and endothermic.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
