MODIFIKASI MATERIAL HIDROKSI LAPIS GANDA NI/AL DAN ZN/AL MENGGUNAKAN ALGA LAUT EUCHEUMA COTTONII SEBAGAI ADSORBEN ZAT WARNA ANIONIK

WIBIYAN, SAHRUL and Royani, Idha and Lesbani, Aldes (2025) MODIFIKASI MATERIAL HIDROKSI LAPIS GANDA NI/AL DAN ZN/AL MENGGUNAKAN ALGA LAUT EUCHEUMA COTTONII SEBAGAI ADSORBEN ZAT WARNA ANIONIK. Masters thesis, Sriwijaya University.

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Abstract

The LDH material has advantages in ion exchange capacity and a large surface area, but its thermal stability and structure often pose challenges for repeated use. Eucheuma cottonii, an abundant red algae in Indonesia, exhibits excellent adsorption properties and contains carrageenan, which is rich in active functional groups and serves as a stabilizer, making it an economical and environmentally friendly choice for material modification. The combination of LDH and Eucheuma cottonii results in a material with higher adsorption capacity, good thermal stability, and regeneration capability for repeated use. The successful preparation of the LDH-Eucheuma cottonii composite is evidenced by characterization results using XRD, IR, BET, and TGA. The material was employed as an adsorbent for anionic dyes and tested for selectivity against direct yellow, methyl orange, congo red, and direct green dyes. Adsorption parameters included variations in pH, contact time, concentration, and adsorption temperature. Material characterization confirmed the successful synthesis of the LDH-Eucheuma cottonii composite. XRD analysis revealed characteristic diffraction patterns of LDH, such as the (003) and (006) planes, indicating that the layered structure remained intact after modification, along with new peaks suggesting interactions between LDH and Eucheuma cottonii. FTIR results identified key functional groups, such as -OH and -SO3 from Eucheuma cottonii, as well as inorganic groups from LDH, indicating chemical integration between the two materials. BET analysis showed an increase in specific surface area in the composite compared to the starting materials, supporting enhanced adsorption capacity. Additionally, thermal characterization via TGA demonstrated that the composite had better thermal stability than LDH. The LDH-Eucheuma cottonii composite exhibited superior performance in removing anionic dyes from solutions. The pH effect revealed that optimal adsorption occurred at pH 5 for the composite. Contact time influenced adsorption efficiency, with equilibrium achieved within a specific time analyzed using pseudo first-order (PFO) and pseudo second-order (PSO) kinetic models, where the PSO model provided the best fit for the data. Concentration and temperature analyses were conducted using Langmuir and Freundlich isotherm models. Furthermore, the material showed excellent regeneration ability, maintaining high adsorption efficiency up to the 4th and 5th reuse cycles, indicating its significant potential as an economical and sustainable adsorbent for wastewater treatment.

Item Type:	Thesis (Masters)
Subjects:	Q Science > QD Chemistry > QD1-999 Chemistry 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:	Sahrul Wibiyan
Date Deposited:	23 Jan 2025 08:47
Last Modified:	23 Jan 2025 08:47
URI:	http://repository.unsri.ac.id/id/eprint/166653

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