Malaysian Journal of Analytical Sciences Vol 19 No 2 (2015): 388 – 396

 

 

 

SINTESIS AMORFUS MANGAN DIOKSIDA (MnO₂) NANO-POROS MENGGUNAKAN PROSES SONOKIMIA DAN BUKAN SONOKIMIA

 

(Synthesis of Nanoporous Amorphous Manganese Dioxide (MnO₂) via Sonochemical and Non-Sonochemical Processes)

 

Siti Zubaidah Hasan, Muhammad Rahimi Yusop, Mohamed Rozali Othman*

 

School of Chemical Science and Food Technology,

Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

*Corresponding author: rozali@ukm.edu.my

 

 

Received: 17 February 2015; Accepted: 17 March 2015

 

 

Abstrak

Amorfus-MnO₂ nano-poros telah disintesis menggunakan proses sonokimia (sonikasi) dan bukan sonokimia (hidroterma) terhadap larutan 0.1 M KMnO₄ menggunakan mangkin silika dan silika-alumina yang permukaannya terubahsuai masing-masingnya pada suhu bilik dan 100⁰C. Amorfus-MnO₂ nano-poros yang diperolehi seterusnya dicirikan dengan menggunakan spektrometer FTIR, dan spektrum yang diperolehi menunjukkan kewujudan serapan ikatan MnO₂. Produk juga dicirikan menggunakan pembelauan sinar-X (XRD), dan morfologi diimbas dengan menggunakan mikroskopi pengimbas elektron-pembolehubah tekanan (VP-SEM) dan juga mikroskopi elektron transmisi (TEM). Kelakuan elektrokimia MnO₂ dikaji menggunakan kaedah voltametri berkitar dan ia menunjukkan MnO₂/Mn²⁺ yang berbalik.

 

Kata kunci: proses sonokimia, proses bukan sonokimia, amorfus MnO₂ nano-poros, voltametri berkitar

 

Abstract

Nano-porous amorphous MnO₂ was synthesized using sonochemical (sonication) and non-sonochemical (hydrothermal) processes to a 0.1 M KMnO₄ solution with modified surface of silica and silica-alumina catalyst at room temperatures and 100⁰C respectively. Nano-porous amorphous MnO₂ obtained was then characterized using infrared spectrometer (FT-IR), and the spectrum shows the absorption of MnO₂ bonding. Structure of the product was later characterized by X-ray diffraction (XRD), and morphology scanned using a scanning electron microscope-variable pressure (VP-SEM) and transmission electron microscopy (TEM). The electrochemical behavior of MnO₂ was studied and it shows reversible of MnO₂ / Mn²⁺.

 

Keywords: sonochemical process, non-sonochemical process, nanoporous amorphous-MnO₂, cyclic voltammetry

 

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