Sintesis Komposit g-C3N4@Zeolit-Y untuk Adsorpsi CO2

Falsyabillah, Falsyabillah (2026) Sintesis Komposit g-C3N4@Zeolit-Y untuk Adsorpsi CO2. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Peningkatan konsentrasi CO2 di atmosfer mendorong pengembangan adsorben berkinerja tinggi untuk aplikasi penangkapan karbon. Penelitian ini bertujuan untuk mengembangkan komposit g-C3N4@Zeolit-Y melalui impregnasi basah dengan variasi rasio zeolit-Y terhadap urea sebagai prekursor g-C3N4 (3:1, 1:1, 1:2, dan 1:3) untuk memperoleh kapasitas adsorpsi dan selektivitas CO2/N2 optimum. Struktur dan sifat material dikarakterisasi menggunakan XRD, FTIR, dan FESEM-EDX. Hasil karakterisasi menunjukkan bahwa modifikasi zeolit-Y dengan g-C3N4 tidak merusak struktur kristal zeolit-Y serta meningkatkan interaksi antarmuka melalui pembentukan situs aktif berbasis nitrogen. Pengujian adsorpsi menunjukkan bahwa sampel ZU11 memiliki kapasitas adsorpsi tertinggi sebesar 14,98 %berat (3,40 mmol/g) pada 303 K dan 1 bar. Nilai tersebut lebih tinggi dibandingkan zeolit-Y murni sebesar 11,64 %berat (2,65 mmol/g). Peningkatan tekanan meningkatkan kapasitas adsorpsi, sedangkan peningkatan suhu menurunkannya. Analisis kinetika menunjukkan bahwa model difusi intrapartikel memberikan kesesuaian terbaik, sedangkan model isoterm Freundlich menunjukkan dominasi adsorpsi pada permukaan heterogen. Analisis termodinamika mengindikasikan bahwa adsorpsi berlangsung secara spontan, eksotermik, dan didominasi oleh fisisorpsi. Hasil penelitian menunjukkan bahwa terdapat komposisi optimum g-C3N4 yang menghasilkan keseimbangan terbaik antara kapasitas dan selektivitas CO2/N2
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the increasing concentration of atmospheric CO2 necessitates the development of high-performance adsorbents for carbon capture applications. This study aimed to develop g-C3N4@Zeolite-Y composites via wet impregnation method with different zeolite-Y to urea as g-C3N4 precursor mass ratios (3:1, 1:1, 1:2, and 1:3) to achieve an optimal balance between CO2 adsorption and CO2/N2 selectivity. The structural and physicochemical properties of the composites were characterized using XRD, FTIR, and FESEM-EDX. The characterization results revealed that the incorporation of g-C3N4 preserved the FAU crystalline framework of zeolite-Y and promoted interfacial interactions through the formation of nitrogen-based active sites. Adsorption measurements showed that the ZU11 sample exhibited the highest CO2 adsorption capacity of 14.98 wt% (3.40 mmol/g) at 303 K and 1 bar, outcoming the pristine zeolite-Y (11.64 wt%, 2,65 mmol/g). Increasing pressure enhanced the adsorption capacity, whereas increasing temperature reduced it. Kinetic analysis indicated that the intraparticle diffusion model provided the best fitting, while the Freundlich isotherm suggest adsorption on heterogeneous surfaces. Thermodynamic analysis demonstrated that the adsorption process was spontaneous, exothermic, and predominantly governed by physisorption. The results indicate the existence of an optimum g-C3N4 composition that provides the best balance between CO2 adsorption capacity and CO2/N2 selectivity.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Adsorpsi CO2, Direct Air Capture, g-C3N4, Selektivitas CO2/N2, Zeolit-Y, CO2 Adsorption, direct air capture, g-C3N4, CO2/N2 selectivity, and zeolite-Y
Subjects:	Q Science Q Science > QD Chemistry Q Science > QD Chemistry > QD501 Catalysis. Catalysts. Q Science > QD Chemistry > QD502 Chemical kinetics Q Science > QD Chemistry > QD547 Flocculation, precipitation, adsorption, etc.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Falsyabillah Falsyabillah
Date Deposited:	03 Aug 2026 00:51
Last Modified:	03 Aug 2026 00:51
URI:	http://repository.its.ac.id/id/eprint/140555

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