3.4. Metode Penelitian
4.2.4. Bentonit Terpilar TiO 2 sebagai Katalis Pembuatan Hidrogen
Bentonit terpilar TiO2 diuji sebagai katalis. Karena TiO2 merupakan
material yang sensitif pada cahaya sehingga dalam H2O bentonit terpilar
sensitifnya terhadap cahaya tidak mengalami perubahan. Akitvitas titania di dalam
bentonit akan menurunkan energi aktivasi dari molekul air sehingga cahaya
ultraviolet akan dapat menjadikan molekul oksigen dan hidrogen aktif. Lama
H O H Ikatan Hidrogen H O H UV, 180 nm O H H2 + O2 H
Hole Silika sebagai Co-Katalis
Gambar 4.8. Bentonit Terpilar TiO2 sebagai Katalis Pembuatan Hidrogen
Akibat penyinaran ultraviolet λ =180 nm, ikatan hidrogen dari air akan terlepas lalu oksigen dari air melakukan interaksi dengan oksida logam TiO2 dan
hidrogen dari molekul air akan berinteraksi dengan silika. Interaksi ini dapat
menurunkan energi aktivasi molekul air. Cahaya ultraviolet masuk ke pori-pori
bentonit oleh SiO2 cahaya ultraviolet diubah menjadi gelombang pendek
mengakibatkan molekul hidrogen dan oksigen putus.
Dari pengujian dihasilkan gas total sebanyak 78,5 % menggunakan
bentonit terpilar yang dietsa, sedangkan yang menggunakan bentonit terpilar–TiO2
5.1. Kesimpulan
1. Bentonit terpilar TiO2 dibuat dari jenis natrium bentonit dapat meningkatkan
basal spacing, luas permukaan, dan volum pori total.
2. SiO2 dari bentonit terpilar TiO2 yang dietsa terjadi hole sehingga silika
merupakan volum yang berlobang, sehingga dapat sebagai co-katalis.
3. Bentonit terpilar TiO2 yang dibuat dalam suasana asam sulfat 1,5 M dapat
digunakan sebagai katalis pembuatan gas hidrogen.
5.2. Saran-Saran
Perlu diteliti cara memisahkan gas hidrogen dan oksigen yang
terbentuk dari peruraian air.
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