This study aims to determine the uptake capacity of langsat (Lansium domesticum) skin on the adsorption of dyes along with the contact time. Textile dyes are dyes which is harmful for the environment and living things. This textile industry waste can cause a decrease in water quality. When this carcinogenic dye enters the human body, it can lead to cancer. The process of these dyes adsorption use langsat skin samples. The components of langsat skin that can adsorb dyes are triterpenoids, saponins and flavonoids. This study uses a batch method by treating the contact time variations of several dyes. The results reveal that the biomass adsorption on rhodamine B, methyl orange, and methylene blue dyes were 11,578 mg/g, 3.8425 mg/g, 36,735 mg/g respectively and with optimum contact time of 60, 90 and 150 minutes, respectively.
Dye waste comes from textile, paint, batik and food industries wastes that produces colored liquid waste which is harmful to the environment. For this reason, the research is carried out to find solutions to these problems. This study aims to determine the effect of flow rate on dye absorption using the column method. Adsorption was carried out by langsat shell activated with nitric acid. The flow rate variations used were 1 mL/minute, 2 mL/minute, 3 mL/minute and 4 mL/minute. The results obtained were that the rhodamine B dye absorbed 1.7901 mg/g, the methyl orange dye occurred 6,0827 mg/g, and the methylene blue dye 12,524 mg/g
The purpose of this study was to determine the optimum conditions i.e. pH and concentration of Rhodamin B and methanyl yellow using CCCR absorbent which is the result of synthesis by using the UV-VIS spectrophotometer. The method used was the adsorption method (Batch). Absorption of rhodamine B and methanyl yellow in solution by C-cinnamalCalix[4] Resorsinarena (CCCR) compound is carried out in a batch system at variations of pH 2, 3, 4, 5, 6, 7. At pH 4,5,6 the amount of H + in the solution is more so that H + competition with rhodamin B is suspected to bind to the functional groups. Ion H+ prevents rhodamine B from reaching the surface of the functional group, so the absorption at these pH is low. At pH 7 occurs the competition of complex formation reaction between chelate compounds with hydroxide ions and this is the optimum pH, while the optimum pH of methanyl yellow occurs at pH 3. Variations in the concentrations of rhodamine B and methanyl yellow are carried out at their optimum pH with variations of 20, 50, 100, 150 and 200 mg / L. The amount of rhodamin B extracted increases with increasing concentration and reaches a maximum absorption value of 1.6235 mg / g at a concentration of 100 ppm.
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