Pengembangan Fotokatalis Heterojunction CdS/TiO2 terdoping CQDs untuk Degradasi Polutan Organik dan Produksi Hidrogen

Handayani, Wury (2024) Pengembangan Fotokatalis Heterojunction CdS/TiO2 terdoping CQDs untuk Degradasi Polutan Organik dan Produksi Hidrogen. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proses reaksi fotokatalisis dimanfaatkan dalam degradasi limbah pewarna AZO Methyl Orange dan produski hidrogen secara simultan. Fotokatalis yang disintesis adalah CdS/TiO2 dengan metode Sol Gel. CdS banyak digunakan sebagai fotokatalis dan TiO2 digunakan sebagai cocatalyst karena dapat meningkatkan efisiensi fotokatalitik. CdS/TiO2 kemudian didoping dengan CQDs. Pada penilitian ini variasi fotokatalis yang disintesis adalah 1:4, 1:2, dan1:1 CdS/TiO2 dengan variasi doping CQDs 0%, 1%, 1.5%, dan 2% pada setiap fraksi massa CdS/TiO2. Karakterisasi fotokatalis dilakukan dengan menggunakan teknik XRD, SEM, FTIR, UV-Vis, dan BET. Berdasarkan hasil karakterisasi XRD, terbentuk TiO2 fase anatase dengan ukuran kristal 16,067 nm dan terbentuk CdS dengan ukuran kristal lebih kecil dari TiO2 yaitu 9,626 nm berbentuk agregat yang terlihat pada hasil SEM. Analisis UV-Vis menunjukkan fotokatalis CdS/TiO2 membentuk struktur heterojunction semikonduktor tipe II. Analisis BET menunjukkan doping CQDs dapat menurunkan aktivitas fotokatalitik karena surface area fotokatalis semakin kecil setela di doping. Namun, penambahan CdS mampu meningkatkan aktivitas fotokatalitik karena surface area fotokatlis semakin meninggkat seiring bertambahnya massa CdS. Aktivitas fotokatalisis untuk uji degradasi polutan organik dan produksi hidrogen dilakukan menggunakan UV-Vis dan chronoamperometry. Hasil uji degradasi menunjukkan 98% removal MO pada variasi 1:1 CdS/TiO2 1% terdoping CQDs. Adapun hasil uji produksi hidrogen terbaik adalah 1:1 CdS/TiO2 1% terdoping CQDs yaitu 13.26 μmol g-1h-1.
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The photocatalytic reaction process is utilized for the simultaneous degradation of AZO Methyl Orange dye waste and hydrogen production. The synthesized photocatalyst is CdS/TiO2, produced using the Sol-Gel method. CdS is widely used as a photocatalyst, and TiO2 is used as a cocatalyst because it can enhance photocatalytic efficiency. CdS/TiO2 is then doped with CQDs. In this study, the variations of the synthesized photocatalysts are 1:4, 1:2, and 1:1 CdS/TiO2 with CQD doping variations of 0%, 1%, 1.5%, and 2% in each mass fraction of CdS/TiO2. The photocatalysts are characterized using XRD, SEM, FTIR, UV-Vis, and BET techniques. Based on the XRD characterization results, anatase phase TiO2 with a crystal size of 16.067 nm and CdS with a smaller crystal size than TiO2, namely 9.626 nm, forming aggregates visible in the SEM results, were formed. UV-Vis analysis shows that CdS/TiO2 photocatalysts form a type II semiconductor heterojunction structure. BET analysis indicates that CQDs doping can decrease photocatalytic activity because the surface area of the photocatalyst becomes smaller after doping. However, the addition of CdS can increase photocatalytic activity because the surface area of the photocatalyst increases with the increasing mass of CdS. Photocatalytic activity for testing organic pollutant degradation and hydrogen production was performed using UV-Vis and chronoamperometry. The degradation test results show 98% MO removal with a 1:1 CdS/TiO2 1% CQDs-doped variation. The best hydrogen production test result is with 1:1 CdS/TiO2 1% CQDs-doped, yielding 13.26 μmol g⁻¹h⁻¹.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CQDs, Fotokatalisis, Heterojunction CdS/TiO2, Hidrogen, Methyl Orange, CdS/TiO2 Heterojunction, Hydrogen, Photocatalysis
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD430 Water--Purification. T Technology > TP Chemical technology > TP248 Nanogels. Nanoparticles. T Technology > TP Chemical technology > TP255 Electrochemistry, Industrial.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	WURY HANDAYANI
Date Deposited:	05 Jul 2024 05:07
Last Modified:	05 Jul 2024 05:07
URI:	http://repository.its.ac.id/id/eprint/108154

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