Abstract

Kinetics of the oxidative degradation of universal strongly acidic cation-exchange resin KU-2×8 is studied using hydrogen peroxide. The effect the nature and concentration of catalytic additives in the form of copper(II) and iron(II) salts have on the oxidation process is determined. It is found that in noncatalytic degradation, the effective rate constant rises from 0.24 × 10⁻³ to 7.54 × 10⁻³ g^1/3 min⁻¹ upon an increase in temperature in the range of 348–368 K. The activation energies of the noncatalytic oxidation of the cation-exchange resin with hydrogen peroxide are characteristic of a process that occurs in the kinetic region and total 132.46–141.96 kJ/mol. It is shown that introducing catalytic additives helps lower E_a of the process to 40.90 kJ/mol and the temperature of degradation by 15–25 K. The pattern of change in the surface morphology of the cation-exchange resin granules during oxidative decomposition is revealed. The approximate composition of the products of cation-exchange resin decomposition is identified via gas chromatography–mass spectrometry.

中文翻译：

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过氧化氢对KU-2×8阳离子交换树脂的氧化降解动力学

摘要

使用过氧化氢研究了通用型强酸性阳离子交换树脂KU-2×8的氧化降解动力学。确定了铜盐（II）和铁盐（II）形式的催化添加剂的性质和浓度对氧化过程的影响。发现在非催化降解中，当温度在348–368 K范围内升高时，有效速率常数从0.24×10 ^-3增至7.54×10 ^-3 g ^1/3 min ^-1。阳离子交换树脂用过氧化氢的非催化氧化是这一过程的特征，该过程发生在动力学区域内，总量为132.46–141.96 kJ / mol。结果表明，引入催化添加剂有助于降低E _a为40.90 kJ / mol，降解温度为15-25K。揭示了阳离子交换树脂颗粒在氧化分解过程中表面形态的变化模式。阳离子交换树脂分解产物的大概组成可通过气相色谱-质谱法鉴定。