Körbahti Bahadır K, Demirbüken Pelin
Faculty of Engineering, Chemical Engineering Department, Mersin University, Mersin, Turkey.
Front Chem. 2017 Oct 13;5:75. doi: 10.3389/fchem.2017.00075. eCollection 2017.
Electrochemical oxidation of resorcinol in aqueous medium using boron-doped diamond anode (BDD) was investigated in a batch electrochemical reactor in the presence of NaSO supporting electrolyte. The effect of process parameters such as resorcinol concentration (100-500 g/L), current density (2-10 mA/cm), NaSO concentration (0-20 g/L), and reaction temperature (25-45°C) was analyzed on electrochemical oxidation using response surface methodology (RSM). The optimum operating conditions were determined as 300 mg/L resorcinol concentration, 8 mA/cm current density, 12 g/L NaSO concentration, and 34°C reaction temperature. One hundred percent of resorcinol removal and 89% COD removal were obtained in 120 min reaction time at response surface optimized conditions. These results confirmed that the electrochemical mineralization of resorcinol was successfully accomplished using BDD anode depending on the process conditions, however the formation of intermediates and by-products were further oxidized at much lower rate. The reaction kinetics were evaluated at optimum conditions and the reaction order of electrochemical oxidation of resorcinol in aqueous medium using BDD anode was determined as 1 based on COD concentration with the activation energy of 5.32 kJ/mol that was supported a diffusion-controlled reaction.
在存在NaSO支持电解质的间歇式电化学反应器中，研究了使用硼掺杂金刚石阳极（BDD）在水介质中对间苯二酚进行电化学氧化。采用响应面法（RSM）分析了间苯二酚浓度（100 - 500 g/L）、电流密度（2 - 10 mA/cm）、NaSO浓度（0 - 20 g/L）和反应温度（25 - 45°C）等工艺参数对电化学氧化的影响。确定最佳操作条件为间苯二酚浓度300 mg/L、电流密度8 mA/cm、NaSO浓度12 g/L和反应温度34°C。在响应面优化条件下，反应120分钟后间苯二酚去除率达100%，COD去除率达89%。这些结果证实，使用BDD阳极可根据工艺条件成功实现间苯二酚的电化学矿化，然而中间体和副产物的形成以低得多的速率进一步氧化。在最佳条件下评估了反应动力学，基于COD浓度确定使用BDD阳极在水介质中电化学氧化间苯二酚的反应级数为1，活化能为5.32 kJ/mol，支持扩散控制反应。
