The Utilization of Duck Egg Shell Waste as A Methylene Blue Bioadsorbent

The development of the textile industry in Indonesia has experienced a significant increase since the 1980s. From the non-oil and gas sector, the textile industry is the largest source of government revenue. In addition to its growth and impressive increase, there are around 10-15% of used textile dyes are thrown away and become waste during the dyeing or coloring process which can exceed the maximum Chemical Oxygen Demand level of 150 mg/L. Synthetic dyes contain carcinogenic substances that can damage the environment and aquatic biota. An alternative for handling dye waste is the adsorption method using bioadsorbent from duck eggshells. The content contained therein has the potential to be used as a bioadsorbent because it has active groups, abundant amounts, and is economical. This study aims to determine the effect of process variables such as adsorbent mass ratio, contact time, and pH on the adsorption capacity of methylene blue using duck eggshells using the UV-Vis Spectrophotometer analysis method. The results of the study showed that the optimal conditions for the adsorption of 30 ppm methylene blue were an adsorbent mass ratio of 8 grams, a contact time of 60 minutes, and a pH of 3. The adsorption capacity obtained was 90.8591%, which reduced the concentration of methylene blue to 0.187 ppm.