ADSORPTION OF RHODAMINE B SOLUTION USING CROSS-LINKED CITRIC ACID-MODIFIED THIOUREA-PVA
One of the textile wastes commonly found in water bodies is the dye rhodamine B. Rhodamine B is a carcinogenic compound, making it crucial to separate it from the aquatic environment. Adsorption method is an effective technique for separating rhodamine B solution due to its simplicity and relative l...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/73052 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | One of the textile wastes commonly found in water bodies is the dye rhodamine B. Rhodamine B is a carcinogenic compound, making it crucial to separate it from the aquatic environment. Adsorption method is an effective technique for separating rhodamine B solution due to its simplicity and relative low cost. In this study, polyvinyl alcohol (PVA) cross-linked with citric acid was further modified with thiourea (TU) to obtain an adsorbent capable of separating rhodamine B solution, named PVA.cl.AS-TU. Analysis using Fourier-Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscope (SEM) confirmed the formation of thiourea groups on PVA.cl.AS-TU. Adsorption tests showed that the optimum adsorption of rhodamine B occurred at pH 4, with a contact time of 4 minutes and an adsorbent dosage of 6 g/L. Kinetic and isotherm studies indicated that the adsorption followed a pseudo-second- order kinetic model with a rate constant of 382.04 × 10-3 g mg-1 min-1 and a Sips isotherm model with a maximum capacity of 79.07 mg/g. The adsorption process was found to be
exothermic, with ?????° and ?????° values of -7.01 kJ/mol and -76.14 J/molK, respectively, and
?????° values at temperatures of 300, 308, 318, and 328 K were determined as 15.89 kJ/mol,
16.44 kJ/mol, 17.20 kJ/mol, and 17.96 kJ/mol, respectively.
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