Studi Kinetika, Isoterm, dan Termodinamika Adsorpsi Pada Biodekolorisasi Metil Oranye Oleh Bakteri Bacillus subtilis yang Terimobilisasi Pada Matriks SA-PVA-Bentonit

Faza, Alya Rusyda (2024) Studi Kinetika, Isoterm, dan Termodinamika Adsorpsi Pada Biodekolorisasi Metil Oranye Oleh Bakteri Bacillus subtilis yang Terimobilisasi Pada Matriks SA-PVA-Bentonit. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Metil oranye (MO) merupakan pewarna azo yang banyak digunakan dalam industri tekstil, pembuatan kertas, farmasi, dan percetakan. Pewarna ini bersifat toksik, karsinogenik, dan mutagenik sehingga berdampak buruk terhadap lingkungan dan kesehatan masyarakat. Banyak metode yang dapat digunakan untuk menghilangkan pewarna azo dari air limbah, salah satunya adalah biodekolorisasi MO menggunakan bakteri Bacillus subtilis yang terimobilisasi pada matriks SA-PVA-Bentonit. Pada penelitian sebelumnya, matriks ini diteliti dapat mendegradasi MO. Namun, matriks SA-PVA-Bentonit membutuhkan waktu yang lebih lama untuk menyerap MO. Oleh karena itu, tujuan penelitian ini adalah mempelajari kinetika, isoterm, dan termodinamika adsorpsi dengan variasi waktu kontak (15-450 menit), konsentrasi (25-300 mg/L), dan suhu (30-45°C) untuk mengetahui kapasitas dan mekanisme adsorpsinya. Konsentrasi MO sebelum dan sesudah dekolorisasi ditentukan mengggunakan spektrofotometer UV-Vis. Hasil kinetika adsorpsi mengikuti orde dua semu dengan waktu kesetimbangan 390 menit. Model ini mengindikasikan bahwa proses adsorpsi MO yang terjadi adalah proses kemisorpsi. Model isoterm adsorpsi yang sesuai yaitu model isoterm Langmuir yang menunjukkan proses adsorpsi monolayer terjadi pada permukaan yang homogen. Dari model isoterm Langmuir juga diperoleh nilai kapasitas adsorpsi maksimum MO sebesar 1,2903 mg/g. Sedangkan, hasil studi termodinamika adsorpsi diperoleh ∆G yang bernilai positif yang menunjukkan adsorpsi tidak spontan. Selain itu, ∆H dan ∆S bernilai negatif yang mengindikasikan proses adsorpsi MO terjadi secara eksotermis dan terjadi penurunan ketidakteraturan sistem saat proses adsorpsi.
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Methyl orange (MO) is an azo dye that is widely used in the textile, papermaking, pharmaceutical and printing industries. These dyes are toxic, carcinogenic and mutagenic so they have a negative impact on the environment and public health. Many methods can be used to remove azo dyes from wastewater, one of which is MO biodecolorization using Bacillus subtilis bacterium immobilized on a SA-PVA-Bentonite matrix. In previous research, this matrix was observed to be able to degrade MO. However, the SA-PVA-Bentonite matrix required a longer time to adsorb MO. Therefore, the aim of this research is to study the kinetics, isotherms, and thermodynamics of adsorption with variations in contact time (15-450 minutes), concentration (25-300 mg/L), and temperature (30-45°C) to determine the capacity and adsorption mechanism. The MO concentration before and after decolorization was determined using a UV-Vis spectrophotometer. The adsorption kinetics results followed pseudo second order with an equilibrium time of 390 minutes. This model indicated that the MO adsorption process that occurs was a chemisorption process. The appropriate adsorption isotherm model was the Langmuir isotherm model which showed that the monolayer adsorption process occurs on a homogeneous surface. From this model, the maximum MO adsorption capacity value was also obtained at 1.2903 mg/g. Meanwhile, the results of the adsorption thermodynamics study showed that ∆G was positive, indicating a non-spontaneous adsorption. In addition, ∆H and ∆S were negative which indicates that the MO adsorption process occurs exothermically and there was a decrease in system disorder during the adsorption process.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Biodekolorisasi, Metil oranye, Bacillus subtilis, Imobilisasi, Kinetika, Isoterm, Termodinamika adsorpsi, Biodecolorization, Methyl orange, Bacillus subtilis, Immobilization, Kinetics, Isoterm, Thermodynamics adsorption
Subjects:	Q Science > QD Chemistry > QD251.2 Chemistry, Organic. Biochemistry
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Alya Rusyda Faza
Date Deposited:	12 Aug 2024 08:03
Last Modified:	13 Aug 2024 07:02
URI:	http://repository.its.ac.id/id/eprint/113938

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