CD Skripsi

Pengaruh Penambahan Selenium Terhadap Sifat Fisis Dan Aktivitas Fotokatalis Zno Biosintesis Menggunakan Ekstrak Daun Matoa

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ABSTRACT
Photocatalyst based semiconductor with the addition of doping is the most efficient method to degrade organic pollutants using ultraviolet light. Selenium is an element that has a high reduction potential which can be used to extract electrons from the valence band to the conduction band so that it can degrade pollutants. In this study, ZnO/Se is prepared by a biosynthetic process using Matoa leaf extract. ZnO/Se synthesis is carried out by reacting Zn(NO3)2∙6H2O solution, Selenium powder in NaBH4 solution, and Matoa leaf extract with variations of Selenium doping namely 0%, 3%, 4%, and 5%. The synthesis solution is irradiated with a 540 Watt microwave source for 3 minutes then annealed at 400°C for 2 hours. Optical absorption, crystal structure, morphology and elemental composition as well as pore surface area are characterized using UV-Vis, XRD, FESEM-EDX, and BET spectroscopy. Photocatalyst application from ZnO/Se samples is tested in degrading 4-nitrophenol (4-NP) pollutant. The UV-Vis spectrum shows that the optimum absorption peak is in the range 383.71 - 389.31 nm with the bandgap energy decreasing from 3.23 eV to 3.18 eV. XRD analysis confirm that the sample has a hexagonal wurtzite crystal structure. Samples with the addition of Selenium doping showed smaller crystal sizes than pure ZnO samples. The FESEM image shows the morphology of the nanoflower-shaped sample with a uniform shape and smaller particle size when Selenium doped is added. The EDX spectrum confirms no other elements are found in the sample apart from Zn, O, and Se elements. BET characterization shows that the sample is a type IV isotherm which indicates the formation of a mesoporous structure. The addition of selenium doping also increased the surface area and porosity of the ZnO/Se biosynthetic samples. The ZnO/Se catalyst succeeds in degrading 4-NP pollutant for 120 minutes with the highest degradation occurring in 5% doping, namely 98.90%, with a reaction rate of -0.034 min-1. Furthermore, samples of ZnO/Se 4%, 3% and 0% show degradation of 98.84%, 95.38% and 94.03%. In conclusion, the addition of Selenium doping to ZnO succeeds in increasing the photocatalyst activity.
Keywords : 4-nitrophenol, photocatalyst, selenium doped ZnO, matoa leaf extract

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

1903112193

Penerbit

Pekanbaru : Universitas Riau - FMIPA - Fisika., 2023

Deskripsi Fisik

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Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

1903112193

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

tethi

Versi lain/terkait

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