Analisis Pengaruh Temperatur Hidrotermal Terhadap Aktivitas Fotokatalitik CuO/ZnO untuk Mereduksi CO2

Widiwijaya, Yanuar (2025) Analisis Pengaruh Temperatur Hidrotermal Terhadap Aktivitas Fotokatalitik CuO/ZnO untuk Mereduksi CO2. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5011211081-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 April 2027. Download (10MB) | Request a copy

Abstract

Perubahan iklim akibat meningkatnya kadar gas rumah kaca terutama gas CO2 membawa dampak buruk seperti meningkatnya temperatur global, penyusutan gletser, hilangnya es laut Antartika, hingga hilangnya keanekaragaman hayati. Sebagai peserta Paris Climate Agreement, Indonesia telah mengupayakan transisi ke energi terbarukan, efisiensi energi, penyimpanan karbon, dan inovasi teknologi konversi CO2 menggunakan fotokatalisis. Fotokatalisis adalah reaksi yang diinduksi cahaya dan dipercepat dengan adanya katalis material semikonduktor. Material CuO dan ZnO telah banyak diteliti sebagai fotokatalis untuk konversi CO2 ataupun degradasi limbah warna. Keduanya mampu membentuk heterojungsi saat digabungkan sehingga efisiensi fotokatalitik dapat tercapai. Oleh karena itu, penelitian ini bertujuan untuk menganalisis pengaruh temperatur hidrotermal dengan variasi 120, 140, dan 160oC selama 12 jam terhadap aktivitas fotokatalitik CuO/ZnO untuk mereduksi CO2. CuO disintesis dari prekursor Cu(CH3CO2)2 menggunakan presipitasi, ZnO disintesis dari prekursor Zn menggunakan thermal oxidation, dan komposit CuO/ZnO disintesis menggunakan hidrotermal. Karakterisasi yang digunakan dalam penelitian ini yaitu SEM-EDX, FTIR, UV-Vis, CV-EIS, dan GC-MS untuk menganalisis performa fotokatalitik material. Hasilnya komposit CuO/ZnO berhasil disintesis dan peningkatan temperatur hidrotermal CuO/ZnO tidak memberikan pengaruh yang linear terhadap ukuran kristal, morfologi, karakteristik, dan performanya dimana variasi optimal adalah 120oC lalu 160oC dan 140oC karena interaksi kompleks antara nukleasi dan pertumbuhan kristal. Pada temperatur 120oC pertumbuhan dominan terjadi sedangkan pada temperatur 140oC lebih dominan nukleasi sehingga kristal kecil yang terbentuk bersaing untuk tumbuh. Ukuran kristal yang diperoleh yaitu 59.41, 40.64, 54.89 nm menghasilkan bandgap yaitu 3.42, 3.59, 3.52 eV. CuO/ZnO menghasilkan konduktivitas listrik masing-masing 214.13, 137.53, 168.74 S/m dan dikategorikan semikonduktor karena berada pada rentang 10-6 – 104 (ohm.m)-1. Aktivitas fotokatalitik reduksi CO2 dipengaruhi oleh ukuran kristal yang dihasilkan dimana variasi 120, 140, 160oC masing-masing menghasilkan 3065, 640, dan 1057 mmol/gr.katalis dengan konversi 68.14, 14.22, 23.51%. Produk utama yang dihasilkan bukan alkohol (etanol, metanol) melainkan (C2H7BO2), (C2H6N2O), dan (C7H17NO2) dikarenakan pelarut DMF teroksidasi yang dibuktikan dengan GC-MS.
=================================================================================================================================
Climate change due to increasing levels of greenhouse gases, especially CO2, has adverse impacts such as increasing global temperatures, shrinking glaciers, loss of Antarctic Sea ice, and loss of biodiversity. As a participant in the Paris Climate Agreement, Indonesia has made efforts to transition to renewable energy, energy efficiency, carbon storage, and innovation in CO2 conversion technology using photocatalysis. Photocatalysis is a reaction induced by light and accelerated by the presence of a semiconductor material catalyst. CuO and ZnO materials have been widely studied as photocatalysts for CO2 conversion or degradation of colored waste. Both are able to form heterojunctions when combined so that photocatalytic efficiency can be achieved. Therefore, this study aims to analyze the effect of hydrothermal temperatures with variations of 120, 140, and 160oC for 12 hours on the photocatalytic activity of CuO/ZnO to reduce CO2. CuO was synthesized from Cu(CH3CO2)2 precursors using precipitation, ZnO was synthesized from Zn precursors using thermal oxidation, and CuO/ZnO composites were synthesized using hydrothermal. The characterization used in this study were SEM-EDX, FTIR, UV-Vis, CV-EIS, and GC-MS to analyze the photocatalytic performance of the material. The results showed that the CuO/ZnO composite was successfully synthesized and the increase in hydrothermal temperature of CuO/ZnO did not have a linear effect on the crystal size, morphology, characteristics, and performance where the optimal variation was 120oC then 160oC and 140oC due to the complex interaction between nucleation and crystal growth. At a temperature of 120oC, dominant growth occurs while at a temperature of 140oC nucleation is more dominant so that small crystals that are formed compete to grow. The crystal sizes obtained were 59.41, 40.64, 54.89 nm producing bandgaps of 3.42, 3.59, 3.52 eV. CuO/ZnO produces electrical conductivity of 214.13, 137.53, 168.74 S/m respectively and is categorized as a semiconductor because it is in the range of 10-6 – 104 (ohm.m)-1. The photocatalytic activity of CO2 reduction is influenced by the size of the crystals produced where variations of 120, 140, 160oC produce 3065, 640, and 1057 mmol/gr.catalyst respectively with conversions of 68.14, 14.22, 23.51%. The main products produced are not alcohol (ethanol, methanol) but (C2H7BO2), (C2H6N2O), and (C7H17NO2) due to the oxidized DMF solvent as evidenced by GC-MS.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CO2, CuO, Fotokatalis, Temperatur Hidrotermal, ZnO CO2, CuO, Hydrothermal Temperature, Photocatalysis, ZnO
Subjects:	Q Science > QD Chemistry > QD1 Oxidation-reduction reaction. Q Science > QD Chemistry > QD181.Z6 Zinc oxide Q Science > QD Chemistry > QD501 Catalysis. Catalysts. Q Science > QD Chemistry > QD716 Photocatalysis.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Yanuar Widiwijaya
Date Deposited:	23 Jan 2025 07:31
Last Modified:	23 Jan 2025 07:31
URI:	http://repository.its.ac.id/id/eprint/116747

Actions (login required)

View Item