KARBONISASI HIDROTERMAL DAN AKTIVASI DARI KULIT BUAH LENGKENG (Dimocarpus longan L.) SEBAGAI ADSORBEN ZAT WARNA MALASIT HIJAU DAN RHODAMIN-B

WIJAYA, ALFAN and Lesbani, Aldes and Hidayati, Nurlisa (2021) KARBONISASI HIDROTERMAL DAN AKTIVASI DARI KULIT BUAH LENGKENG (Dimocarpus longan L.) SEBAGAI ADSORBEN ZAT WARNA MALASIT HIJAU DAN RHODAMIN-B. Undergraduate thesis, Sriwijaya University.

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Abstract

Hydrochar preparation of longan fruit peel (Dimocarpus longan L.) rind has been carried out at various temperature and carbonization time variations and activation using NaOH. The material was characterized using X-Ray Diffraction (XRD), Fourier Transform Infra Red (FT-IR), Scanning Electron Microscope (SEM) and Brunauer-Emmett-Teller (BET) analysis. The material is used as an adsorbent for malachite green and rhodamine-B dyes. The adsorption process of malachite green and rhodamine-B dyes on the adsorbent was studied through the effect of pH, time, temperature, adsorption concentration and selectivity of dyes mixture, and desorption and regeneration processes of the adsorbent on dyes. The best temperature and time of carbonization in the hydrochar material are 250 ºC on 10 hours. The results of XRD analysis on longan fruit peel, hydrochar temperature 250 ºC and hydrochar activated by NaOH appeared diffraction peaks of about 24º with an increasingly sharp intensity after hydrothermal carbonization and activation processes. The results of FT-IR analysis showed in each material there are five active groups that is –OH, C-H aliphatic, C=O, isolated C=C, and C-O-C. Based on the results of SEM analysis, it showed the surface of the longan fruit skin and NaOH activated hydrochar has a morphology that forms an aggregate and the hydrochar without activation has a morphological shape that tends to be heterogeneous. The results of the BET analysis showed there was an increase the surface area of the material after the hydrothermal carbonization process, which is carried out at a temperature of 250 ºC from 17.175 m2/g to 18.712 m2 / g and increased after activation to 21.548 m2/g. The adsorption process for the malachite green dye on each adsorbent occurred optimally at pH 6 and the rhodamine-B dye at pH 3. The effect of the adsorption kinetics of the malachite green and rhodamine-B dyes more likely to follow the pseudo second order kinetics equation. The effect of concentration and adsorption temperature shows that the greater the adsorbate concentration and the higher the temperature, the greater the adsorption capacity. Adsorption isotherm parameters of malachite green dye for each adsorbent tend to follow the Freundlich isotherm model and rhodamine-B dye follows the Langmuir isotherm. Hydrochar adsorbent with a carbonization temperature of 250 ºC has greatest adsorption capacity at the adsorption of malachite green dye is 212,766 mg/g and rhodamine-B dye is 151,515 mg/g. The type of solvent suitable for the dye desorption process in the longan fruit skin adsorbent and NaOH activated hydrochar adsorbent is NaOH and the hydrochar adsorbent is ethanol. The regeneration process of longan fruit peel adsorbent and the activated hydrochar was more stable against the malachite green dye, while the hydrochar without activation was more stable against the rhodamine-B dye. The selectivity of the mixture of malachite green and rhodamine-B dyes indicated that the malachite green dye is more easily adsorbed on each adsorbent than the rhodamine-B dye. Based on the XRD analysis, there was a change in the structure of the adsorbent after the adsorption process of malachite green and rhodamine-B dyes was caused by a chemical interaction between the adsorbent and dye.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Kulit buah lengkeng (Dimocarpus longan. L), hidrochar, adsorpsi, malasit hijau, rhodamin-B
Subjects:	Q Science > QD Chemistry > QD146-197 Inorganic chemistry
Divisions:	08-Faculty of Mathematics and Natural Science > 47201-Chemistry (S1)
Depositing User:	Users 11464 not found.
Date Deposited:	31 Mar 2021 06:48
Last Modified:	31 Mar 2021 06:48
URI:	http://repository.unsri.ac.id/id/eprint/44615

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