Malaysian Journal of Analytical Sciences Vol 21 No 3 (2017): 745 - 753

DOI: https://doi.org/10.17576/mjas-2017-2103-24

 

 

 

O₃/S₂O₈^2- OXIDATION OF REACTIVE RED 120: EFFECT OF OPERATIONAL PARAMETERS

 

(Pengoksidaan O₃/S₂O₈^2- Terhadap Reactive Red 120: Kesan Parameter Operasi)

 

Siti Nasuha Sabri, Che Zulzikrami Azner Abidin*, Fahmi Muhammad Ridwan, Ong Soon An, Razi Ahmad,

Kow Su Huan

 

School of Environmental Engineering,

Universiti Malaysia Perlis, Kompleks Pusat Pengajian Jejawi 3, 02600 Arau, Perlis, Malaysia

 

*Corresponding author: zulzikrami@unimap.edu.my

 

 

Received: 28 November 2016; Accepted: 5 February 2017

 

 

Abstract

In this research, the decolourisation performance of Reactive Red 120 (RR120) in aqueous solution using O₃/S₂O₈^2- was evaluated. RR120 was selected due to high solubility in the aquatic environment. Ozonation (O₃) experiments were conducted as a control, to compare the treatment performance after addition of sodium persulphate. The aim of this research is to identify the effect of operational parameters of O₃/S₂O₈^2- treatment on colour and COD removal. All experiments were carried out under continuous operation in a bubble column reactor. Operational parameters, namely initial dye concentration, S₂O₈^2- dosage, initial pH, and contact time, were manipulated to optimize the performance of O₃/S₂O₈^2-. The effect of parameters on decolourisation performance was identified based on colour and COD removal. The performance of colour and COD removal in the O₃ was also compared with O₃/S₂O₈^2- treatment processes. The intermediates were characterized based on its spectra evolution via UV-Vis spectrophotometer. The findings showed on increases in S₂O₈^2- dosage that leads to an increase in the decolourisation efficiency. In addition, when the initial concentration increased to 300 mg/L, the decolourisation efficiency decreases as high concentration of azo bond cause the deficiency of the oxidation process.  The O₃/S₂O₈^2- performance also improved in alkaline pH, in the presence of hydroxyl radical. By comparing these two treatments, O₃/S₂O₈^2- obtained better removal efficiency in colour than O₃.

 

Keywords:  O₃/S₂O₈^2-, ozonation, decolourisation, Reactive Red 120, persulphate

 

Abstrak

Dalam kajian ini, prestasi penyingkiran warna O₃/S₂O₈^2- dinilai terhadap Reactive Red 120 (RR120) dalam larutan akues. RR120 telah dipilih kerana keterlarutan tinggi dalam persekitaran akuatik. Eksperimen pengozonan (O₃) telah dijalankan sebagai kawalan, untuk membandingkan prestasi rawatan selepas penambahan natrium persulfat. Tujuan kajian ini adalah untuk mengenal pasti kesan parameter operasi rawatan O₃/S₂O₈^2- terhadap penyingkiran warna dan COD. Eksperimen ini telah dijalankan di bawah operasi yang berterusan dalam reaktor turus panjang. Parameter operasi, iaitu kepekatan awal pewarna, dos S₂O₈^2-, pH awal, dan masa sentuhan, telah dimanipulasikan untuk mengoptimumkan prestasi O₃/S₂O₈^2-. Kesan parameter terhadap prestasi penyingkiran telah dikenal pasti berdasarkan penyingkiran warna dan COD. Prestasi penyingkiran warna dan COD dalam O₃ juga telah dibandingkan dengan proses rawatan O₃/S₂O₈^2-. Perantaraan daripada RR120 telah dicirikan berdasarkan perubahan spektrum menerusi spektrofotometer UV-Vis. Hasil kajian menunjukkan peningkatan dos O₃/S₂O₈^2- membawa kepada peningkatan kecekapan penyingkiran warna. Di samping itu, apabila kepekatan awal RR120 meningkat kepada 300 mg/L, kecekapan peyingkiran warna turut berkurangan, kerana kepekatan ikatan azo meningkat menyebabkan proses pengoksidaan berkurangan. Prestasi O₃/S₂O₈^2-juga bertambah baik pada pH alkali, dengan kehadiran radikal hidroksil. Dengan membandingkan kedua-dua perawatan, didapati O₃/S₂O₈^2- mempunyai kecekapan penyingkiran warna yang lebih baik daripada O₃.

 

Kata kunci:  O₃/S₂O₈^2-, pengozonan, penyingkiran warna, Reactive Red 120, persulfat

 

 

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