CD Skripsi

Sintesis Dan Aktivitas Katalitik Ag-Mno2 Dengan Metode Refluks Untuk Degradasi Metilen Biru

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Manganese oxides have been applied for the wide range of applications such as catalyst, sensor, adsorben, battery materials and super capacitor. This research focuses on the synthesis of layer and tunnel structures of manganese oxides. The two phases of manganese oxides, birnessite (layered material) and cryptomelane (tunnel material) were successfully synthesized by reflux method and then doped with AgNO3 with a doping concentration of 1% ion Ag+. The pristine MnO2 was first prepared from the reaction between KMnO4 and citric acid by reflux method and followed by doping with ion Ag+ using the same reflux method (two-step reflux route). Both the pristine and Ag-MnO2 were then applied as Fenton heterogeneous catalysts for the degradation of methylene blue. The XRD results indicated that low concentration of KMnO4 (0.25M) resulted in the formation of tunnel structure of cryptomelane especially with the increasing of reflux time from 6 to 24 hours, whereas high concentration of KMnO4 (0.5M) led to production of layered birnessite as main product. Doping with 1% ion Ag+ at low KMnO4 concentration appeared to retain tunnel structure of crystomelane, while higher KMnO4 concentration produced the mixtures of birnessite and cryptomelane phases. No additional phases were detected due Ag ions, suggesting than ion Ag+ was well distributed in the MnO2 phase. The analysis by gas surface analyzer of selected pristine MnO2 indicated that the pristine tunnel cryptomelane and doped cryptomelane have high surface areas compared to those of birnessite and doped birnessite. The catalytic activities of pure and Ag-MnO2 for the degradation of methylene blue showed that both pure cryptomelane and Ag-cryptomelane displayed higher degradation of methylene blue than those of birnessite counterparts. The highest degradation of methylene blue was 87.86% using pristine and Ag-MnO2 that synthesized from concentration of 0.25 M KMnO4 using 5 ml H2O2 and 50 ppm methylene blue within 120 minutes at room temperature, which are correlated with the high surface areas of these materials.

Keywords: birnessite, cryptomelane, doping

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

03 02. 120 (0046)

Penerbit

Pekanbaru : Universitas Riau – FMIPA – Kimia., 2020

Deskripsi Fisik

xiv, 47 hlm.: ill.: 29 cm

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

03 02. 120 (0046)

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

ELFITRA

Versi lain/terkait

Lampiran Berkas

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