The kinetics and mechanism of the reaction between chlorine dioxide and phenol in acidic aqueous solution期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

The kinetics and mechanism of the reaction between chlorine dioxide and phenol in acidic aqueous solution

Affiliation:	1. Chemical Engineering Department, Environmental Catalysis Research Group, Universidad de Antioquia, Calle 70 N° 52-21, Medellín 050010, Colombia;3. Cátedra de Química Orgánica, Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, Calles 60 y 119 s/n, La Plata B1904AAN, Argentina

Abstract:	Chlorine dioxide reacts with phenol in aqueous solution below pH 2 appropriate to the rate law −d[C1O2]dt={k1+k2/H+}[C1O2][φOH] role=presentation style=font-size: 90%; display: inline-block; position: relative;> $− d[C1O_{2}] d t ={k_{1} +k_{2} /H^{+}}[C1O_{2}][φOH]$ $− d[C1O_{2}] d t ={k_{1} +k_{2} /H^{+}}[C1O_{2}][φOH]$ where k₁ = 0·47 ± 0·01 M⁻¹ sec⁻¹ and k₂ = 0·0110 ± 0·0002 sec⁻¹ at 25°C and unit ionic strength. The corresponding activation parameters in the 5–35°C range are ΔH₁³ = 11·6 ± 0·3 kcal mole⁻¹, ΔH₂³ = 13·5 ± 0·3 kcal mole⁻¹, ΔS₁³ = −21 ± 0·5 eu and ΔS₂³ = −22 ± 1 eu.Additional evidence for a term in the rate law also containing ClO₂⁻ and suggesting Cl₂O₄⁻ as an oxidizing species was obtained. The mechanism of the reaction is discussed in terms of the observed rate law and a one-electron transfer process.

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