Metal-organic framework Uio-66 for adsorption of methylene blue dye from aqueous solutions

Methylene blue color is a cationic dye which is used in textile industry. Health effects of methylene blue dye discharge into the environment is including toxicity, high color, reduced light penetration in water, high stability, and low degradation capability. So, removing it from the environment is extremely important. The aim of this study was to synthesize Uio-66 MOFs used for adsorption of methylene blue from synthetic sample. The synthesized UiO-66 MOFs were characterized by using XRD, FE-SEM, EDAX, and BET analyses. Various parameters were evaluated such as pH, initial MB concentration, reaction time, and adsorbent dose. The findings showed that the sizes of Uio-66 crystals were between 153 and 213 nm. Total pore volume, BET, and Langmuir surface area were found to be 657, 906 m(2) g(-1), and 0.446 m(3) g(-1), respectively. Zeta potential of Uio-66 was equal to 6. As a result, at higher than zeta potential point, methylene blue adsorption on Uio-66 is favorable. Maximum adsorption has been achieved at the pH = 9. The maximum adsorption capacity of Uio-66 for methylene blue was 91 mg/g. Optimum dose of Uio-66 was 0.4 g L-1 for methylene adsorption. The Langmuir I isotherm was a fit model to describe the adsorption isotherm. Pseudo-first-order kinetic model was a fit model to describe the adsorption kinetic of MB on Uio-66. The Uio-66 MOF is a promising adsorbent in the adsorption of methylene blue from aqueous solution. [GRAPHICS] .