Adsorpsi Nitrat Oleh Ampas Tebu (Saccharum officinarum L.): Optimasi Dengan Desain Box Behnken Response Surface Methodology

Zubir, Zahhra Hanifa (2025) Adsorpsi Nitrat Oleh Ampas Tebu (Saccharum officinarum L.): Optimasi Dengan Desain Box Behnken Response Surface Methodology. Other thesis, Institut Teknlogi Sepuluh Nopember.

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Abstract

Pemanfaatan limbah organik yang tidak terpakai, seperti ampas tebu, penting dilakukan untuk mengurangi pencemaran lingkungan. Adsorben dari ampas tebu memiliki stabilitas termal yang baik dan luas permukaan besar, sehingga cocok untuk aplikasi adsorpsi. Penelitian ini bertujuan untuk mensintesis dan mengkarakterisasi adsorben berbasis ampas tebu, serta mengaplikasikannya dalam proses adsorpsi larutan nitrat. Sintesis adsorben dilakukan melalui metode karbonasi dengan nitrogen, kemudikan dilakukan karakterisasi X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR) dan Field Emission Scanning Electron Microscopy–Energy Dispersive X-ray (FESEM–EDX). Optimasi kondisi adsorpsi dilakukan dengan metode Response Surface Methodology (RSM) menggunakan desain Box–Behnken. Variabel yang digunakan meliputi massa adsorben (0,05; 0,15; 0,25 g), konsentrasi awal larutan nitrat (0,6; 0,8; 1,0 M), dan waktu kontak (30; 60; 90 menit). Konsentrasi larutan awal dan akhir saat proses adsorpsi dianalisis menggunakan teknik voltametri untuk mengukur perubahan arus listrik. Kondisi optimum diperoleh pada massa adsorben 0,05 g, waktu kontak 60 menit, dan konsentrasi awal 1,0 M dengan efisiensi penghilangan nitrat sebesar 55,72%. Model isoterm adsorpsi mengikuti model Langmuir dengan koefisien determinasi (R²) sebesar 0,9988, dan kinetika adsorpsi mengikuti model orde dua semu dengan koefisien determinasi (R²) sebesar 0,9955.
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Utilization of unused organic waste, such as bagasse, is important to reduce environmental pollution. Adsorbents from bagasse have good thermal stability and large surface area, making them suitable for adsorption applications. This study aims to synthesize and characterize bagasse-based adsorbents, and apply them in the adsorption process of nitrate solutions. Adsorbent synthesis was carried out through the carbonation method with nitrogen, then characterization was carried out using X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR), and Field Emission Scanning Electron Microscopy–Energy Dispersive X-ray (FESEM–EDX). Optimization of adsorption conditions was carried out using the Response Surface Methodology (RSM) using the Box–Behnken design. The variables used included adsorbent mass (0.05; 0.15; 0.25 g), initial concentration of nitrate solution (0.6; 0.8; 1.0 M), and contact time (30; 60; 90 minutes). The initial and final solution concentrations during the adsorption process were analyzed using voltammetry techniques to measure changes in electric current. Optimum conditions were obtained at an adsorbent mass of 0.05 g, a contact time of 60 minutes, and an initial concentration of 1.0 M with a nitrate removal efficiency of 55.72%. The adsorption isotherm model followed the Langmuir model with a coefficient of determination (R²) of 0.9988, and the adsorption kinetics followed a pseudo-second-order model with a coefficient of determination (R²) of 0.9955.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Ampas Tebu, Adsorpsi, Response Surface Methodology, Nitrat Sugarcane Bagasse, Adsorption, Response Surface Methodology, Nitrat
Subjects:	Q Science Q Science > Q Science (General) Q Science > QD Chemistry Q Science > QD Chemistry > QD75.2 Chemistry, Analytic
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Zahra Hanifa Zubir
Date Deposited:	06 Aug 2025 08:47
Last Modified:	06 Aug 2025 08:47
URI:	http://repository.its.ac.id/id/eprint/127839

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