Metal-organic framework based on Co and 4,4′-dimethylenebiphenyl diphosphonic acid as an efficient methylene blue adsorbent

초록

Dyestuff in industrial wastewater continues to entail environmental pollution and thus developing an adsorbent with superior adsorption performance is urgently required for the survival of future generations. In this work, a novel Co– and H4dbp based metal-organic framework (MOF, denoted as Co-MOF) adsorbent was developed for the removal of methylene blue (MB) from aqueous solution. Hydrothermal synthesis was employed for the fabrication of the Co-MOF with phosphonic acid organic ligand. X-ray diffraction, Fourier-transform infrared spectroscopy, field emission-scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and N2 adsorption-desorption isothermal analysis were utilized for Co-MOF characterization. MB adsorption by as-prepared adsorbent obeys pseudo-second-order adsorption kinetics and follows Langmuir isotherm model with the maximum adsorption capacity of 147.99 mg g−1, which is superior to other analogies. Furthermore, the recoverability of this adsorbent material was astonishing with an excellent MB removal capacity of 89.34 % of initial dye concentration after the fifth cycle. The thermodynamic parameters affirm that this adsorption process exhibits a spontaneous endothermic process with sufficient molecular randomness due to the adsorbent-adsorbate interaction suggesting a great potentiality as an adsorbent to be used for industrial wastewater treatment to mitigate the environment. © 2021 The Korean Society of Industrial and Engineering Chemistry

키워드