Asep Bayu Dani Nandiyanto, Dwi Novia Al Husaeni, Risti Ragadhita, Meli Fiandini, Dwi Fitria Al Husaeni, Rina Maryanti
This study aims to analyse and find isotherm adsorption to remove dye when using calcium carbonate fabricated from avocado seed waste with a computational model of calculation. To obtain calcium carbonate, the avocado seed waste carbonization process was carried out at a temperature of 230ºC for 3 hours and using milling. A batch-reactor technique was used to investigate the adsorption isotherm model. Curcumin was used as a dye model which was adsorbed under constant pressure, pH, and temperature conditions. The adsorption results then used ten adsorption isotherm models, including Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Fowler-Guggenheim, Hill-DeBoer, Jovanovic, Harkin-Jura, Flory-Huggins, and Halsey. In addition, the calcium carbonate characterization process was also carried out using an optical microscope, sieve test, and Fourier transforms infrared instrument. The results of this study indicate that there are two suitable models to represent the adsorption method, namely Langmuir and Hill-DeBoer. The model was taken based on research data with a regression value/correlation coefficient (R2) of 0.95. In general, it can be concluded that the adsorption process in this study is attractive, profitable, and spontaneous. The adsorption process is a cooperative monolayer and multilayer. The types of interactions that occur are chemical and physical adsorption. This research shows that avocado seed waste carbon microparticles can be used as an adsorbent to treat coloured waste. © School of Engineering, Taylor’s University.
Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung, Indonesia
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