KOMPOSIT HIDROKSI LAPIS GANDA-EKSTRAK UNCARIA GAMBIR UNTUK FOTODEGRADASI TETRASIKLIN

JEFRI, JEFRI and Lesbani, Aldes and Fithri, Najma Annuria (2025) KOMPOSIT HIDROKSI LAPIS GANDA-EKSTRAK UNCARIA GAMBIR UNTUK FOTODEGRADASI TETRASIKLIN. Masters thesis, Sriwijaya University.

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Abstract

Layered Double Hydroxide (LDH) is a hydrotalcite-like inorganic material known for its large surface area and ability to modify anions between layers. However, its repeated use is still limited due to its weak thermal and structural stability. To improve its performance and stability, LDH was modified with extracts of Uncaria gambir (UG, which is rich in secondary metabolites in the form of flavonoids (about 90 mg/g CE) so that it can provide functional groups and is environmentally friendly as a composite material. The resulting LDH-UG composite showed high photocatalytic activity, good thermal stability, and reuse potential. The success of composite formation was confirmed through characterization using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), and UV-Visible Diffuse Reflectance Spectroscopy (UV-DRS). XRD analysis showed typical LDH diffraction patterns in the (003) and (006) planes and the appearance of new peaks after modification with UG, while FT-IR spectra indicated the presence of -OH, C=C, NO₃-, and metal-oxygen (M-O) bonds in the fingerprint region. BET showed significant changes in surface area due to the interaction between LDH and active compounds in UG. SEM images indicated that the initially diverse LDH particles became finer and more uniform after modification. The decrease in band gap energy observed through UV-DRS supports the increase in photocatalytic activity of the material. Photodegradation application tests on tetracycline antibiotics showed optimum performance at pH 7, 30 mg catalyst mass, and 120 minutes reaction time, with the Langmuir-Hinshelwood kinetics model showing that the value of the reaction rate constant (k) on the composite increased. Other parameter variations, such as pollutant concentration, temperature, and material regeneration, showed more optimal results in the LDH-UG composite than pure LDH. Thus, the LDH-UG composite shows great potential as an environmentally friendly photocatalyst for antibiotic waste treatment and water pollution mitigation.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Photodegradation, Composite, LDH, Tetracycline, Uncaria gambir
Subjects:	Q Science > QD Chemistry > QD146-197 Inorganic chemistry T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials > TA401.A327 Materials science
Divisions:	11-Postgraduates Study > 28101-Material Science (S2)
Depositing User:	Jefri Jefri
Date Deposited:	26 May 2025 14:28
Last Modified:	26 May 2025 14:28
URI:	http://repository.unsri.ac.id/id/eprint/174234

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