Sintesis Granul Natritum Alginat/ZSM-5 Terlapis BiOBr dengan Variasi Sodium Alginat untuk Dekolorisasi Metilen Biru

Holisoh, Silmi (2026) Sintesis Granul Natritum Alginat/ZSM-5 Terlapis BiOBr dengan Variasi Sodium Alginat untuk Dekolorisasi Metilen Biru. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Metilen biru (MB) merupakan zat warna kationik yang banyak digunakan dalam industri tekstil, percetakan, dan farmasi serta bersifat persisten sehingga berpotensi mencemari lingkungan perairan. Kombinasi adsorpsi dan fotokatalisis menjadi salah satu metode yang efektif untuk menghilangkan polutan tersebut. Penelitian ini bertujuan untuk mensintesis granul sodium alginat (SA)/ZSM-5 terlapis BiOBr dengan variasi konsentrasi sodium alginat (2, 4, 6, dan 8%) serta mengkaji pengaruhnya terhadap karakteristik material dan aktivitas dekolorisasi metilen biru. Granul SA/ZSM-5 disintesis menggunakan metode gelasi ionik dengan larutan CaCl2 sebagai agen crosslinking, kemudian dilapisi BiOBr melalui metode kopresipitasi. Material hasil sintesis dikarakterisasi menggunakan X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy-Energy Dispersive X-ray (FESEM-EDX), dan Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS). Aktivitas dekolorisasi diuji menggunakan larutan metilen biru 30 ppm di bawah penyinaran UV-LED selama 120 menit. Hasil karakterisasi menunjukkan bahwa fase kristal BiOBr dan ZSM-5 berhasil terbentuk serta BiOBr terdistribusi pada permukaan granul. Variasi konsentrasi sodium alginat memengaruhi morfologi, luas permukaan, dan aktivitas dekolorisasi material. Sodium alginate dalam bentuk granul dapat mempermudah proses pemisahan material fotokatalis dari larutan setelah proses dekolorisasi. Pada granul SA/ZSM-5 tanpa pelapisan BiOBr, kemampuan adsorpsi tertinggi diperoleh pada variasi 2% SA G sebesar 54,79%, sedangkan kontribusi fotokatalitik tertinggi diperoleh pada variasi 4% SA G sebesar 5,34%. Setelah pelapisan BiOBr, efisiensi dekolorisasi meningkat menjadi 66–69%, dengan konstanta laju reaksi tertinggi sebesar 0,0316 menit-1 pada variasi 6% SA GB. Variasi 4% SA GB dipilih menjadi material paling optimum karena menunjukkan efisiensi dekolorisasi yang sebanding, yaitu 68,69%, sehingga dipilih sebagai komposisi yang berpotensi dikembangkan lebih lanjut.
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Methylene blue (MB) is a cationic dye widely used in the textile, printing, and pharmaceutical industries; it is persistent and therefore has the potential to contaminate aquatic environments. The combination of adsorption and photocatalysis is one effective method for removing this pollutant. This study aims to synthesize BiOBr-coated sodium alginate (SA)/ZSM-5 granules with varying sodium alginate concentrations (2, 4, 6, and 8%) and to examine their effect on the material’s characteristics and methylene blue decolorization activity. The SA/ZSM-5 granules were synthesized using the ionic gelation method with a CaCl2 solution as the crosslinking agent and then coated with BiOBr via the coprecipitation method. The synthesized materials were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy–energy dispersive X-ray (FESEM-EDX), and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). Decolorization activity was tested using a 30 ppm methylene blue solution under UV-LED irradiation for 120 minutes. The characterization results showed that the crystalline phases of BiOBr and ZSM-5 were successfully formed and that BiOBr was distributed on the surface of the granules. Variations in sodium alginate concentration affected the morphology, surface area, and decolorization activity of the material. For SA/ZSM-5 granules without BiOBr coating, the highest adsorption capacity was obtained at a 2% SA G concentration (54.79%), while the highest photocatalytic contribution was obtained at a 4% SA G concentration (5.34%). After BiOBr coating, the decolorization efficiency increased to 66–69%, with the highest reaction rate constant of 0.0316 min-1 at the 6% SA GB concentration. However, the 4% SA GB concentration showed a comparable decolorization efficiency of 68.69% and was therefore selected as a composition with potential for further development.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Sodium alginat, ZSM-5, BiOBr, metilen biru, dekolorisasi. Sodium alginate, ZSM-5, BiOBr, methylene blue, decolorization.
Subjects:	Q Science > QD Chemistry > QD117 Absorption Q Science > QD Chemistry > QD716 Photocatalysis.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Silmi Holisoh
Date Deposited:	14 Aug 2026 08:50
Last Modified:	14 Aug 2026 08:50
URI:	http://repository.its.ac.id/id/eprint/144353

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