The Effectiveness of Coffee Waste Ground by Simple Washing on the Adsorption of Methylene Blue

Abstract

The coffee waste ground was applied as an adsorbent for methylene blue. The investigated adsorption parameters were adsorbent dose, contact time and percentage adsorption. The coffee waste ground was thoroughly simple and showed better adsorption than pure coffee waste. The high adsorption percentage of 96.98%, 97.99% and 98.14% was obtained when using the dose of adsorbent of 0.1, 0.2, and 0.25 g, respectively. The adsorption reached the equilibrium at 10 min of contact time. The adsorption capacity was 9.82 mg/g for 0.25 g of coffee waste ground. The maximum capacity of adsorption based on the Langmuir model was found to be 208.33 and 416.67 mg/g for pure coffee waste and coffee waste ground, respectively. The characterization of the adsorbent has been done using Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectrometer (FTIR). In conclusion, the coffee waste ground has potential as adsorbent to remove methylene blue in the wastewater. For the future, coffee waste ground can be a potential adsorbent to remove another waste in the water.