Spent Coffee Grounds Modified Fe-al--zr Nano-composites For The Removal Of Acid Brown 75 Dye From Tannery Waste

This research was conducted to evaluate the adsorption performance of spent coffee ground modified Fe-Al-Zr nano-composite. The Al2O3/Fe3O4/ZrO2 ternary oxide system was efficiently synthesized from the respective salt precursors by a two-step co-precipitation method under nitrogen atmosphere in basic condition (pH=12). Scanning electron microscope (SEM), Energy dispersive X-ray (EDX) and X-ray diffraction (XRD), were used to characterize the features of the adsorbents. The pH point of zero charge of the selected adsorbent was also determined. Batch adsorption experiment was conducted under different conditions such as contact time, initial concentration of dye, pH, sorbent dosage and agitation speed. The Langmuir and Freundlich, isotherms were tested to examine the adsorption behavior. The equilibrium data was well fitted to Langmuir isotherm model. The maximum adsorption capacity (Qo) was 8.4 mg/g for acidic brown 75 dyes. The kinetic data correlated (R2 =0.999) well with the pseudo second order kinetic model. To evaluate the practical applicability of the spent coffee ground supported nano-composite adsorbent to real samples, effluent was collected from Batu Leather Industry. The result demonstrated 95.7% removal efficiency of spent coffee ground modified nano-composite for the acidic brown75 dye at optimum experimental condition.

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