Martiza, Najla Marsya (2026) Studi Kinetika, Isoterm, dan Termodinamika Adsorpsi pada Biodekolorisasi Metil Oranye oleh Bakteri Ralstonia pickettii yang Terimobilisasi pada Matriks SA/PVA/Karbon Aktif. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Limbah tekstil umumnya didominasi oleh penggunaan pewarna azo yang memiliki struktur sangat stabil sehingga sulit untuk didegradasi. Salah satu pewarna azo yang mencemari perairan adalah metil oranye (MO) yang berpotensi menimbulkan dampak negatif bagi lingkungan. Salah satu cara untuk mengatasi masalah tersebut adalah dengan bioremediasi menggunakan bakteri yang terimobilisasi pada suatu matriks polimer. Sodium alginate (SA) dan Polivinil alkohol (PVA) digunakan sebagai matriks karena memiliki biokompabilitas dan stabilitas mekanik yang baik, sementara karbon aktif ditambahkan untuk meningkatkan kapasitas adsorpsi. Oleh karena itu, penelitian ini bertujuan untuk mempelajari kinetika, isoterm, dan termodinamika adsorpsi MO menggunakan bakteri Ralstonia pickettii yang terimobilisasi matriks SA/PVA/karbon aktif. Penelitian ini menggunakan variasi waktu kontak selama 1-420 menit, konsentrasi awal MO 25-500 mg/L, dan suhu 30, 37, dan 45°C. Hasil kinetika adsorpsi menunjukkan proses adsorpsi mengikuti orde dua semu dengan nilai R2 sebesar 0,9973 dengan waktu kesetimbangan pada 360 menit. Analisis Isoterm adsorpsi menunjukkan proses adsorpsi mengikuti model isoterm Langmuir dengan nilai R2 sebesar 0,9989 dan kapasitas maksimum sebesar 0,421 mg/g. Sementara itu, termodinamika adsorpsi menunjukkan energi bebas Gibbs standar (ΔG°) bernilai negatif yang menandakan adsorpsi berlangsung secara spontan. Selain itu, perubahan entalpi (ΔH°) dan entropi (ΔS°) yang dihasilkan bernilai postif yang menunjukkan proses adsorpsi reaksi bersifat endotermik dan disertai dengan peningkatan ketidakteraturan sistem.
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Textile wastewater is dominated by the use of azo dyes, which possess highly stable structures that make them difficult to degrade. One of the azo dyes frequently found in aquatic environment is methyl orange (MO), which may cause adverse environmental impacts. One approach to addressing this problem is bioremediation using bacteria immobilized in a polymer matrix. Sodium alginate (SA) and polyvinyl alcohol (PVA) are used as matrices due to their good biocompatibility and mechanical stability, while activated carbon is added to enhance the adsorption capacity. Therefore, this study aimed to investigate the kinetics, isotherms, thermodynamics of MO biodecolorization using Ralstonia pickettii bacterium immobilized in SA/PVA/activated carbon matrix. This research employed variations in contact time (1-420 minutes), initial MO concentrations (25-500 mg/L), and temperatures (30, 37, and 45°C). The adsorption kinetics results indicated that the adsorption process followed a pseudo-second-order model with an R2 value of 0,9973 and reached equilibrium time at 360 minutes. The adsorption isotherms analysis indicated that the adsorption process was best described by the Langmuir isotherm model with an R2 value of 0,9989 and a maximum adsorption capacity of 0,421 mg/g. Meanwhile, the thermodynamics analysis revealed a negative standard Gibbs free energy (ΔG°), indicating that the adsorption occurred spontaneously. Furthermore, the positive enthalpy (ΔH°) and enthropy (ΔS°) suggested that the adsorption process was endothermic and accompanied by an increase in system randomness.
| Item Type: | Thesis (Other) |
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| Uncontrolled Keywords: | Biodekolorisasi, Imobilisasi, Metil Oranye, Ralstonia pickettii, SA/PVA/Karbon Aktif, Biodecolorization, Immobilization, Methyl orange, Ralstonia pickettii, SA/PVA/Activated Carbon |
| Subjects: | Q Science Q Science > QD Chemistry Q Science > QD Chemistry > QD251.2 Chemistry, Organic. Biochemistry |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis |
| Depositing User: | Najla Marsya Martiza |
| Date Deposited: | 04 Aug 2026 02:06 |
| Last Modified: | 04 Aug 2026 02:06 |
| URI: | http://repository.its.ac.id/id/eprint/140906 |
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