Study on catalytic activity of Co(II) in Rhodamine B decolorization by peroxymonocarbonate in aqueous solution. (6th November 2022)

• Record Type: Journal Article
• Authors: Hanh, Nguyen Thi; Huyen, Pham Thi; Thu, Nguyen Hoai; Ngan, Nguyen Bich; Duy, Vu Ngoc; Viet, Nguyen Thi Bich
• Is Part Of: Vietnam journal of chemistry. Volume 60(2022)Supplement 1
• Page Start: 96
• Page End: 102
• Publication Date: 2022-11-06
• Subjects: Peroxymonocarbonate -- Rhodamine B -- cobalt catalyst -- first‐order rate law -- decolorization; Chemistry -- Periodicals; 540
• DOI: 10.1002/vjch.202200089
• Languages: English
• ISSNs: 0866-7144

Abstract

Abstract: Decolorization of Rhodamine B (RhB) by peroxymonocarbonate (HCO4 – ) in aqueous solution was investigated in this study. All experiments were conducted in a 50 mL batch reactor at room temperature (26 ± 1°C) and pH of 9.0. The oxidizing agent (peroxymonocarbonate) was prepared in‐situ by the reaction between hydrogen peroxide and bicarbonate (molar ratio of H2 O2 :HCO3 – is 2:1). The catalytic effect of four metal ions including Co(II), Cu(II), Fe(II), Mn(II) on the decolorization by HCO4 – was evaluated. Co(II), the metal ion giving the best catalytic effect, has been selected to study the stability of peroxymonocarbonate agent. To clarify the role of H2 O2 and HCO4 – in oxidizing RhB dye, a series of experiments were conducted at different concentrations of HCO3 ‐ and Co(II) catalyst. UV and ultrasound irradiations were also tested for enhancing the decolorization rate. The results revealed that in the presence of Co(II) ion, HCO4 – becomes more reactive and a synergic effect on the RhB degradation has been observed when both Co(II) and HCO4 – are present in the oxidation system. And under UV light, complete decolorization of RhB by peroxymonocarbonate agent could be obtained after only 20 minutes of irradiation. Abstract :