Aluminum doped ZnO crystal powders have been successfully prepared by sol-gel method with low temperature (150°C) crystallization process. The AlNO3 as material dopant were varied by 0.5 wt% and 1.0 wt% relate to 5 mmol of zinc acetate dihydrate as precursor. Degradation of the methylene blue (MB) was used to evaluate the photocatalytic property. The results showed that all ZnO samples have spherical morphology with hexagonal wurtzite crystal structures. The ZnO powder with 0.5 wt % of aluminum has a better photocatalytic property that related to the optical characteristics. The optimum of Al content (0.5wt%) reduces the crystallite size and give some advantages in optical characteristics that directly relate to the increments in photocatalytic behavior. The photodegradation rate of Al doped ZnO 0.5 wt% is increase almost 100% compared with ZnO undoped. The stability and reusability of 0.5 wt% Al doped ZnO as photocatalyst, is also observed by monitoring the photocatalytic behavior under 14 hours irradiation (in three recycle used)
Studi pembuatan beserta karakterisasi serbuk ZnO berukuran sub-nano telah berhasil dilakukan. Untuk mengetahui sifat optik, morfologi serta struktur dari serbuk ZnO, dilakukan beberapa karakterisasi menggunakan spektroskopi UV-Vis, spektroskopi FTIR, spektroskopi fotoluminesensi (PL), scanning electron microscopy (SEM), tunnelling electron microscopy (TEM) dan difraksi sinar-X (XRD). Berdasarkan spektrum absorbansi dan fotoluminesensi, energi gap nanopartikel ZnO sekitar 3,25 eV. Puncak emisi yang teramati pada panjang gelombang daerah ultraviolet (381 nm) berkaitan dengan nilai energi gap. Sedangkan puncak emisi pada daerah hijau-kuning menunjukkan defect berupa oxygen vacancy dan surface trap. Hasil karakterisasi FTIR, ikatan Zn-O telah terbentuk dan mendominasi, meskipun masih adanya keberadaan gugus karbonil yakni ikatan C=O dan ikatan CO. Hal tersebut kemungkinan besar berkaitan dengan proses pemanasan yang hanya mencapai 150°C. Sedangkan, kemurnian tinggi dimiliki film tipis yang ditandai dengan ketidakberadaannya gugus karbonil pada spektrum FTIR dan hanya menyisakan gugus Zn-O saja. Berdasarkan karakterisasi SEM dalam bentuk film tipis, ukuran partikel yang dapat teramati berkisar 50 nm. Sedangkan berdasarkan hasil pengukuran menggunakan TEM pada serbuk ZnO, ukuran partikel terkecil berkisar 15 nm. Berdasarkan hasil karakterisasi XRD dapat diketahui serbuk nano dan lapisan tipis ZnO memiliki struktur kristal hexagonal wurtzite.
Serbuk nanokomposit ZnO:GO telah berhasil disintesis menggunakan metode sol-gel dengan kristalisasi suhu rendah (150 ° C). Variasi waktu aging juga diberikan untuk melihat karakteristik optik dan sifat fotokatalitik dari ZnO:GO. Degradasi metilen biru (MB) digunakan untuk mengevaluasi sifat fotokatalitik ZnO:GO. Hasil penelitian menunjukkan bahwa semua sampel ZnO memiliki struktur kristal hexagonal wurtzite. ZnO:GO dengan waktu aging 5hari dapat mengurangi ukuran kristal namun tidak menunjukan karakteristik fotokatalitik yang lebih baik. Serbuk ZnO:GO dengan waktu aging 3 hari memiliki sifat fotokatalitik yang lebih baik dibanding dengan variasi lainnya, hal ini dikonfirmasi dengan laju fotodegradasi ZnO:GO meningkat hampir 100%. Selain itu, beberapa sifat optik juga menunjukan karakteristik yang secara langsung berhubungan dengan peningkatan perilaku fotokatalitik.
ZnO:Graphene Oxide composite nanopowders have been successfully prepared by sol-gel method. The study of composite preparation is discussed in this paper. Graphene oxide was added in two ways in order to study the mixed behaviour especially in photocatalytic properties. The degradation of methylene blue (MB) concentration in water was used to evaluate the photocatalytic property under low UV-light irradiation (14 μW/cm2). The results showed that all varian ZnO-GO composite samples have spherical morphology and hexagonal wurtzite crystal structure. An addition of graphene oxide (GO) in ZnO precursor solution during preparation shows a better photocatalytic property that related to reducing in particle size, thereby produce a large surface area and formed a better interfacing with GO/rGO. The existence of GO around ZnO nanoparticles gives some advantageous due to presences of hydroxyl component that directly relate to the increments in photocatalytic behavior. The photodegradation rate of MB in water using ZnO-GO composite as catalyst is significantly increase compared with pure ZnO.
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