Adsorpsi Kristal Violet Menggunakan Karbon Kulit Manggis: Optimasi dengan BBD-RSM

Rachmawati, Linda Amelia (2023) Adsorpsi Kristal Violet Menggunakan Karbon Kulit Manggis: Optimasi dengan BBD-RSM. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pengurangan kadar pewarna kristal violet dapat dilakukan menggunakan metode adsorpsi secara batch dengan adsorben berupa karbon aktif dari kulit manggis. Karbon aktif diaktivasi dengan H2SO4. Proses adsorpsi dilakukan berdasarkan metode respon permukaan (RSM) menggunakan metode BBD untuk optimasi faktor yang mempengaruhi adsorpsi. Faktor tersebut diantaranya, waktu kontak 20,70, 120 menit, massa adsorben 20,50,100 mg, konsentrasi awal adsorbat 10,50,70 mg/L. karbon aktif yang dipreparasi dikarakterisasi dengan FTIR, SEM, BET. Hasil karakterisasi FTIR pada karbon aktif menunjukkan adanya gugus sulfonat (-SO3H) yang disebabkan oleh aktivasi dengan asam sulfat. Hasil karakterisasi SEM menunjukkan adanya pori pada karbon aktif. Kondisi optimal untuk adsorpsi kristal violet dapat ditentukan melalui desain Box-Behnken pada rentang waktu kontak 80 hingga 100 menit, massa adsorben 75 hingga 95 mg, dan konsentrasi adsorbat sebesar 30 hingga 60 mg/L. melalui persamaan polynomial dari BBD, titik optimal dapat dicapai dengan mencampurkan 25 mL larutan kristal violet 45 mg/L dengan adsorben 90 mg dan diaduk dengan kecepatan 130 rpm selama 90 menit. Setelah diadsorpsi, larutan diukur absorbansi dengan spektrofotometer UV-Vis sehingga dapat dihitung konsentrasi sesudah adsorpsi. Melalui perhitungan konsentrasi tersebut, didapat kadar penurunan kristal violet sebesar 95,29%. Dengan demikian, adsorben karbon aktif dari kulit manggis dapat menjadi adsorben yang efektif untuk pengurangan kadar zat warna kristal violet dalam air.
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The efficient removal of crystal violet dye can be achieved through batch adsorption using activated carbon derived from mangosteen rind. The activation process of the carbon involved the use of H2S04. To optimize the adsorption process, the response surface method (RSM) was employed, utilizing the Box-Behnken design (BBD) to analyze the influential factors. These factors encompassed the contact time (20, 70, and 120 minutes), mass of the adsorbent (20, 50, and 100 mg), and initial concentration of the adsorbate (10, 50, and 70 mg/L). The activated carbon prepared from mangosteen rind underwent characterization using FTIR and SEM. The FTIR analysis confirmed the presence of sulfonic groups (-S03H) on the activated carbon surface, which resulted from the activation process with sulfuric acid. SEM characterization revealed the presence of pores, indicative of the porous nature of the activated carbon. The optimization of crystal violet adsorption conditions was conducted through polynomial regression of the BBD model. The optimal conditions were determined to be a contact time of 80-100 minutes, an adsorbent mass of 75-95 mg, and an adsorbate concentration of 30-60 mg/L. Based on these parameters, the optimal point was identified as the mixing of 25 mL of a 45 mg/L crystal violet solution with 90 mg of the adsorbent, followed by stirring at 130 rpm for 90 minutes. Subsequent measurement of absorbance using a UV-Vis spectrophotometer enabled the determination of the crystal violet concentration after adsorption, revealing an impressive reduction of 95.29%. In conclusion, the activated carbon derived from mangosteen peel exhibited remarkable efficacy as an adsorbent for crystal violet dye. The adsorption process under optimized conditions resulted in a significant reduction in crystal violet concentration, demonstrating the effectiveness of this adsorbent for dye removal.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Adsorpsi, Kristal Violet, Karbon Aktif, RSM, BBD, Kulit Manggis
Subjects:	Q Science > QA Mathematics > QA279 Response surfaces (Statistics). Analysis of covariance. Q Science > QD Chemistry > QD547 Flocculation, precipitation, adsorption, etc.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Linda Amelia Rachmawati
Date Deposited:	31 Aug 2023 02:01
Last Modified:	31 Aug 2023 02:01
URI:	http://repository.its.ac.id/id/eprint/103483

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