CD Tesis

Biosintesis Seng Oksida Doping Sulfur Dan Selenium Menggunakan Ekstrak Daun Bidara Untuk Fotodegradasi Polutan 4-Nitrofenol

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Water pollution is a major problem that requires proper treatment. 4-nitrophenol (4 NP) is an organic water pollutant which is very dangerous for living things because it has mutagenic, phytotoxic and cytotoxic effects. Pollutants 4-NP in water can be degraded into harmless compounds by the photocatalyst method. The semiconductor-based photocatalytic process has a mechanism for destroying various organic and inorganic materials without producing harmful by-products. The photocatalytic process utilizes electron-hole pairs that are formed in semiconductor materials when illuminated by light with an energy above its bandgap energy. Doping is one way to modify the bandgap energy in order to increase efficiency in degrading pollutants.
In this study, the non-metallic elements sulfur and selenium were used for doping the ZnO semiconductor material. Zinc nitrate hydrate (ZNH) (0.05 M) was used as the precursor. The doping percentage was varied by 1% to 5% to obtain the best doping composition of sulfur and selenium for the photocatalytic activity of ZnO to degrade 4-NP pollutants. The biosynthesis method was chosen to reduce hazardous chemical waste with bidara leaf extract (ziziphus mauritiana) used to synthesize ZnO doped with sulfur atoms and selenium atoms. This synthesis was carried out under microwave irradiation to increase the reaction rate and selectivity. The doping of sulfur and selenium was varied. The optical properties of the samples were characterized using UV-Vis spectroscopy. The crystal structure is known from the results of Ray Diffraction (XRD) characterization. Elemental morphology and composition were analyzed from the results of Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-ray (EDX) characterization. The surface area was analyzed from the results of the Brunauer-Emmett-Teller (BET) characterization. The results of the photocatalyst test were seen from the color change in the solution and analyzed from the UV-Vis spectroscopy results.
The results showed that the optical absorption peak of ZnO, both sulfur and selenium doped, was at 357-367 nm. These results are consistent with the characteristics of ZnO which has optimal absorption at a wavelength of 360 nm. The ZnO crystal structure obtained was hexagonal wurtzite with an average crystal size of 12.81 nm for sulfur doped ZnO and 13.10 nm for selenium doped ZnO. The surface morphology of ZnO showed a flower-like shape in all samples, both sulfur and selenium doped. The surface area of 1% and 5% sulfur doped ZnO is 11.397 m2g-1 and 31.700 m2g-1, respectively. In ZnO:Se 1 and 5% doping, they were 16.182 m2g-1 and 19.857 m2g-1. The greatest degradation efficiency in
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degrading 4-nitropenol occurred in 1% ZnO:S and 1% ZnO:Se samples, namely 85.89% and 87.17%.
Key words: ZnO, Bidara leaf extract, Photocatalyst, Degradation, 4-NP Pollutant

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

2010247295

Penerbit

Pekanbaru : Universitas Riau – Pascasarjana – Tesis Fisika., 2023

Deskripsi Fisik

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Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

2010247295

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

FISIKA

Info Detail Spesifik

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Pernyataan Tanggungjawab

FATAH

Versi lain/terkait

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