Development of hybrid zinc tannate material for toxic cationic brilliant green dye removal from wastewater

The versatility in designing hybrid materials allows for tailored properties to meet specific needs, leading to innovative solutions and advancements in various technological fields. The present study introduces Zinc tannate (ZnTA) as a cost-effective, environmentally friendly, and highly effective hybrid material for the removal of the toxic dye Brilliant Green (BG) from wastewater. ZnTA is synthesized via a simple and straightforward wet chemical route. Batch adsorption tests under optimal conditions, such as an adsorbent dose of 25.5 mg/20.0 mL at pH 6.0 with a contact time of 7.5 min, demonstrated that ZnTA removes 99.8 % of the BG dye at optimized conditions. The adsorption of BG on ZnTA follows pseudo-second-order kinetics and fits the Langmuir isotherm model. The adsorption mechanism involves van der Waals forces, electrostatic interactions, it-it stacking, and hydrogen bonding. Additionally, desorption-regeneration studies indicate that ZnTA can be reused for up to five cycles of BG dye adsorption, maintaining an efficiency of 82.7%. To precis, this study evidence that ZnTA can be deemed as a practical adsorbent for cleaning dye-contaminated water.