STUDY ON THE EFECTIVE REMOVERAL AMMONIUM FROM WATER OF H2O2 MODIFIED - BIOCHAR FROM COFFEE HUSK

Abstract

Biochar modification with chemical agents is a recently applied method to increase the adsorption capacity of materials. In this study, hydrogen peroxide (H₂O₂), a strong oxidant, was used as a biochar - modifing agent from coffee husk. Scanning electron microscope (SEM) result shows that the obtains material has a smooth and porous structure. Fourier transform infrared spectrometry (FTIR) revealed that the characteristic functional groups on the surface of the material include: hydroxyl groups (O-H),  carbonyl groups (C=O) and carboxyl groups (-COOH). Research on the ammonium adsorption process shows that the optimal conditions for the adsorption of the material are: pH = 7, material content of 6 g/L, adsorption time is 20 minutes, initial ammonium concentration is 5mg/L. The highest adsorption capacity according to the Langmuir isotherm model of this material is q_m = 12.74 mg/g. When treating ammonium in domestic wastewater, the material has an absorption efficiency of 69.43%. These results indicate that H₂O₂ modified - biochar from coffee husk could be a promising material in treating ammonium in water.