This study was performed to determine the efficiency of the electro/persulfate process to remove basic violet 16 (BV16) dye and COD from aqueous solutions. The present study was experimentally performed on a laboratory scale. The effect of pH on the process was investigated independently, and after performing the experiments, the effect of voltage (volts), the dose of persulfate (g/L), initial concentration of BV16 dye, and electrolysis time was investigated with the model presented by Box Behnken design, and optimal conditions for BV16 dye removal was obtained. Under optimal conditions, COD removal efficiency and toxicity changes during the process were calculated, and the effect of distance between electrodes and surface of electrodes on process efficiency was investigated. By-products of oxidative degradation were determined with LS-MS. The amount of electrical energy consumed by the process was investigated by voltage changes and then the kinetics of the process was investigated by a pseudo-first-order model. The results showed that the electro/persulfate process in optimal conditions including pH of 5, a voltage of 11.43 V, persulfate dose of 0.09 g/L, initial BV16 concentration of 45 mg/L, and electrolysis time of 48.5 min could provide BV16 dye removal efficiency of 95% and COD removal efficiency of 57.14%. Findings of electrical energy consumption showed that with increasing voltage, the efficiency of the process increased, but the amount of energy consumption also increased. Under optimal conditions, increasing distance between the electrodes was led to a decrease in removal efficiency, but the removal efficiency increased with the increasing surface of the electrodes. Based on the kinetic results, the electro/persulfate process followed pseudo-first-order kinetics with R 2 = 0.9956. The present study showed that the electro/persulfate process as a useful technique has high efficiency in removing BV16 dye and its toxicity from aqueous solutions and can be effective and useful in removing the COD of solution.

中文翻译：

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通过水溶液中的电活化过硫酸盐工艺降解碱性紫罗兰色16染料并使用微生物进行毒性评估：副产物的测定，反应动力学和Box-Behnken设计的优化

进行这项研究是为了确定电/过硫酸盐法从水溶液中去除碱性紫16（BV16）染料和COD的效率。本研究在实验室规模上进行了实验。分别研究了pH值对工艺的影响，并在进行了实验后，用提出的模型研究了电压（伏特），过硫酸盐的剂量（g / L），BV16染料的初始浓度和电解时间的影响。通过Box Behnken设计，获得了去除BV16染料的最佳条件。在最佳条件下，计算了过程中化学需氧量的去除效率和毒性变化，并研究了电极与电极表面之间的距离对工艺效率的影响。氧化降解副产物用LS-MS测定。通过电压变化来研究过程所消耗的电能量，然后通过拟一阶模型来研究过程的动力学。结果表明，在最佳条件下（包括pH值为5，电压为11.43 V，过硫酸盐剂量为0.09 g / L，BV16初始浓度为45 mg / L，电解时间为48.5分钟），电/过硫酸盐法可以提供BV16染料去除率达95％，化学需氧量去除率达57.14％。电能消耗的研究结果表明，随着电压的升高，过程效率提高，但能耗量也有所增加。在最佳条件下，电极之间的距离增加导致去除效率降低，但是去除效率随电极表面的增加而增加。根据动力学结果，电/过硫酸盐过程遵循拟一级动力学，R 2 = 0.9956。本研究表明，电/过硫酸盐法作为一种有用的技术具有从水溶液中去除BV16染料及其毒性的高效率，并且在去除溶液的COD方面可以是有效和有用的。