CD Tesis

Degradasi Oksidatif Metilen Biru Menggunakan Cryptomelane Yang Disintesis Dengan Metode Sol-Gel: Pengaruh Dopan Pada Degradasi Oksidatif

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Manganese oxides plays a major role in the mobility and bioavailability of environmental contaminants, such as heavy metals and toxic organic molecules, and may be strongly regulated by manganese oxides. Manganese oxides are thought to be the strongest, naturally occurring oxidants and oxidize a large variety of organic substrates. This thesis focused on the synthesis of tunnel-type manganese oxide, cryptomelane and its the oxidixing power for degradation of a dye. The oxidative degradation of pristine, Fe-cryptomelane and Cu-cryptomelane was investigated for the degradation of methylene blue (MB). Both pristine and the doped-cryptomelane were synthesized by sol-gel method and the resulting products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), BET, FTIR and AAS. The average oxidation state (AOS) of Mn in the products was determined to investigate an active oxidation state of Mn in this redox process. The XRD results indicated that the cryptomelane-type manganese oxide was obtained from the synthesis and the Cu-cryptomelane has similar diffraction peaks, suggesting that the dopant was well distributed within the structure of cryptomelane. The incorporation of Fe into cryptomelane resulted in the additional reflection peak due to the formation of hematite phase in the pristine cryptomelane. The introduction of the dopant also resulted in the reduction of surface area of cryptomelane. The presence of Fe or Cu in the cryptomelane was detected by AAS and IR spectroscopy due the lattice vibration of O-Fe-O and an increase in dopant concentration following more incorporation of the dopant. The solution pH is the dominant factor for the oxidative degradation of MB, in which pristine cryptomelane exhibited greater degradation ability that the doped-cryptomelane. The presence of the dopant seemed to have a negative effect on the oxidative degradation of MB, which decreased with an increase of doping concentration. The maximum degradation of MB by pristine cryptomelane was 99.07% achieved under condition of solution pH 2, cryptomelane amount of 50 mg, initial MB concentration of 10 ppm.
Key words: oxidative degradation, cryptomelane, doping, sol gel

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

10 05. 220 (0022)

Penerbit

Pekanbaru : Universitas Riau – Pascasarjana – Tesis Kimia., 2020

Deskripsi Fisik

xii, 93 hlm,; ill.: 29 cm

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

10 05. 220 (0022)

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

FATAH

Versi lain/terkait

Lampiran Berkas

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