Sains Malaysiana 43(11)(2014): 1761–1768

Pengoksidaan Elektrokimia C. I. Reactive Orange 4 Menggunakan

Elektrod Komposit Dwilogam

(Electrochemical Oxidation of C. I. Reactive Orange 4 Using Bimetallic Composite Electrodes)

NORAZZIZI NORDIN¹ & MOHAMED ROZALI OTHMAN^1,2*

¹Makmal Elektrosintesis dan Elektrokimia Sekitaran, Pusat Pengajian Sains Kimia

dan Teknologi Makanan, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor, Malaysia

²Pusat Penyelidikan dan Analisis Air (ALIR), Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Diserahkan: 17 April 2013/Diterima: 1 April 2014

ABSTRAK

Elektrod komposit dwilogam yang disediakan hasil campuran serbuk argentums (Ag) dan karbon (C) (dinamakan AgC-PVC) memberikan hasil elektrolisis larutan pewarna C. I. Reactive Orange 4 (RO4) yang tidak berwarna dan tanpa penghasilan enapan lumpur berbanding elektrod komposit dwilogam lain. Perbezaan nisbah komposisi serbuk Ag:C (30:70, 50:50 and 70:30) dalam penyediaan elektrod seterusnya diuji untuk melihat kesan perbezaan komposisi ini terhadap penyahwarnaan RO4. Melalui persamaan Tafel yang diperoleh, elektrod Ag_28.5C_66.5-_PVC5 yang menggunakan komposisi 30% Ag dan 70% C memberikan nilai perubahan ketumpatan arus, io yang lebih tinggi iaitu 3.555 mA/cm² berbanding elektrod lain. Elektrod ini mempunyai aktiviti pemangkinan elektrokimia yang lebih baik berbanding elektrod lain. Hasil proses elektrolisis elektrod Ag_28.5C_66.5-PVC₅ terhadap larutan RO4 telah dianalisis menggunakan spektrofotometer UV-Nampak dan didapati proses degredasi kumpulan azo dalam pewarna tersebut telah berlaku selepas proses elektrolisis yang menghasilkan larutan tidak berwarna.

Kata kunci: Elektrod komposit dwilogam; pengoksidaan elektrokimia; penyahwarnaan

ABSTRACT

Bimetallic composite electrode prepared from mixture of argentums (Ag) and carbon (C) powder (known as AgC-PVC) becomes the best electrode to decolorize C. I. Reactive Orange 4 (RO4) solution without sludge formation in the end of electrolysis process. Three ratios of Ag:C powder (30:70, 50:50 and 70:30) have been used for preparation of electrode to investigate the effect of electrode composition toward decolorization of RO4 solution. From Tafel equation obtained, the value of exchange current density, io for Ag_28.5C_66.5-PVC₅ prepared from 30% Ag and 70% C is 3.555 mA/cm² becomes the highest than other electrodes. This electrode gives the best electrocatalytic activity compared to others. The clear solution produced after electrolysis of RO4 was analyzed by UV-VIS spectrophotometer to identify the level of decolorization. The UV-Vis spectrum shows that degradation of azo group occurs in RO4 structure to produce clear solution after electrolysis process.

Keywords: Bimetallic composite electrode; decolorization; electrochemical oxidation

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*Pengarang untuk surat menyurat; email: rozali@ukm.edu.my