ADSORPTION OF HEAVY METAL CR6+ IN WASTE USING GEOPOLIMER WITH BIOCHAR FILLER

• Main Author: Rifanda Hendrawan, Aditya
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/50137
• Institution: Institut Teknologi Bandung

Industrial field produces byproducts in form of hazardous and toxic waste, one of them is heavy metal hexavalent chromium (Cr6+). One of heavy metals removal methods that can be done is adsorption through ion exchange interaction. Biochar can be used as an excellent adsorbent, especially when made in geopolimer form. In this research, biochar was made by granulation process at 123 rpm. Then, biochar was activated by NaOH 12M to form geopolimer. Cellulose from paper pulp was added to enhance the adsorption with concentration variation of 0%, 2%, 4%, and 6%. Adsorption of Cr6+ was done by immersing biochar in artificial solution with 6 and 12 hours time variation. Characterization showed that biochar used was similar to fly ash type C. Geopolimerization had successfully done where Si-O-Si and Si-O-Al functional groups can be seen in characterization results. The immersion test results showed change in solution color from orange to yellow and also change in pH. This was caused by the abundance of calcium and the effect of NaOH aktivator solution in biochar. In addition, immersion test also showed that cellulose played role in the making of porosity and Cr6+ adsorption. The highest adsorption of Cr6+, which was 23.92%, was achieved by biochar with 6% of cellulose in 6 hours of immersion.