Adsorpsi Gas CO2 pada Karbon Aktif Terdoping Nitrogen Dari Ampas Tebu

Kurniawan, Randy Yusuf (2019) Adsorpsi Gas CO2 pada Karbon Aktif Terdoping Nitrogen Dari Ampas Tebu. Masters thesis, Institut Teknologi Sepuluh Nopember.

Text 01211750010002-Master_Thesis.pdf Restricted to Repository staff only Download (10MB)

Abstract

Pada penelitian ini telah disintesis karbon aktif terdoping nitrogen dari ampas tebu (SBACN-X) dengan variasi massa urea X=0, 1, 2, 3, 4 dan 5 gram melalui 2 tahapan yaitu karbonisasi dan aktivasi dengan urea sebagai sumber nitrogen. Struktur dan ikatan yang terdapat pada karbon aktif terdoping N masing-masing variasi massa urea, dikarakterisasi dengan difraksi sinar-X (XRD) dan spektroskopi inframerah (FTIR), sedangkan luas permukaan dan porositas diukur dengan adsorpsi-desorpsi N2. Morfologi karbon diamati dengan SEM. Hasil XRD menunjukkan bahwa penambahan atom N pada karbon aktif menurunkan tingkat grafitisasi karbon. Hasil FTIR menunjukkan bahwa karbon aktif terdoping N memiliki ikatan C=C dan C=N. Adanya doping N pada sampel SBACN-X dapat meningkatkan luas permukaan dan volume pori karbon aktif hingga X=4 gram. Penambahan N juga dapat menurunkan diameter pori rata-rata karbon aktif dengan pori berukuran mikro mulai terbentuk saat X=4 gram. Pengujian kapasitas adsorpsi gas CO2 melalui metode gravimetri menunjukkan bahwa nilai kapasitas adsorpsi tertinggi diperoleh pada SBACN-4 pada suhu adsorpsi 30°C yaitu sebesar 29,7 % berat. Kapasitas adsorpsi gas CO2 tersebut sangat dipengaruhi oleh luas permukaan dan volume mikropori dari karbon aktif. Hasil studi kinetika dan termodinamika menunjukkan bahwa sebagian besar karbon aktif mengikuti model kinetika orde dua semu untuk variasi massa dan kenaikan suhu adsorpsi mengakibatkan proses adsorpsi mengikuti model difusi intra partikel dengan nilai perubahan entalpi (ΔH), perubahan entropi (ΔS) pada suhu 30°C masing-masing sebesar -4,525 kJ/mol; -0,013 kJ/mol.K, sedangkan nilai energi Gibbs (ΔG) untuk variasi suhu 30, 40 dan 50°C pada SBACN masing-masing sebesar -0,409; -0,273; -0,137 kJ/mol.
================================================================================================================================
This study investigated nitrogen-doped activated carbon derived from sugarcane bagasse using urea as the nitrogen source (SBACN-X), with urea additions of X = 0, 1, 2, 3, 4, and 5 g. The synthesis was carried out through two stages, namely carbonization and activation in the presence of urea. The structural and chemical characteristics of the nitrogen-doped activated carbon were analyzed using X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopy, while the specific surface area and pore characteristics were determined by N₂ adsorption–desorption analysis. The surface morphology was examined using Scanning Electron Microscopy (SEM). XRD analysis indicated that nitrogen incorporation reduced the degree of carbon graphitization. FTIR spectra confirmed the presence of C=C and C=N functional groups in the nitrogen-doped activated carbon. Nitrogen doping also enhanced the specific surface area and micropore volume of the activated carbon. The CO₂ adsorption capacity, evaluated using the gravimetric method, reached its highest value for the SBACN-4 sample at an adsorption temperature of 30°C, corresponding to 29.7 wt%. The CO₂ adsorption performance was strongly influenced by the specific surface area and micropore volume of the activated carbon. Kinetic and thermodynamic analyses showed that most samples followed the pseudo-second-order kinetic model with respect to urea mass variation, while increasing the adsorption temperature caused the adsorption process to follow the intraparticle diffusion model. The thermodynamic parameters at 30°C were ΔH = −4.525 kJ mol⁻¹ and ΔS = −0.013 kJ mol⁻¹ K⁻¹, whereas the Gibbs free energy (ΔG) values for adsorption at 30, 40, and 50°C were −0.409, −0.273, and −0.137 kJ mol⁻¹, respectively, indicating that the adsorption process was spontaneous under the investigated conditions.

Item Type:	Thesis (Masters)
Subjects:	Q Science Q Science > QD Chemistry
Divisions:	Faculty of Natural Science > Chemistry > 47101-(S2) Master Thesis
Depositing User:	Kurniawan Randy Yusuf
Date Deposited:	20 Jul 2026 07:34
Last Modified:	20 Jul 2026 07:34
URI:	http://repository.its.ac.id/id/eprint/68505

Actions (login required)

View Item