Abstract
The hydroxyl groups (-OH) was modified on the surface metal-organic framework UiO-66 to improve the adsorption capacity of cationic dye methylene blue (MB). In this work, a novel preparation method was adopted to obtain the adsorbents through adjusting the amount of hydrochloric acid (HCl), which is a regulator, in reactions to obtain non-crystalline materials (NCM-WIT) and crystalline materials (U-(OH)2) which is modified MOFs by -OH groups. They both showed excellent MB adsorption performance in the pH range of 3–11. From the experimental analysis, the results were shown that the zeta potentials of adsorbents surface are more negative improving the adsorption capacity of cationic dye MB. The fitting results of their adsorption isotherms and adsorption kinetics fit the Langmuir model and pseudo-second-order kinetic, respectively. It was found that U-(OH)2 has a more stable regeneration capacity just using solvent washing. This study provides a good idea for wastewater treatment containing cationic dyes.
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