Dükkancı Meral
Engineering Faculty, Chemical Engineering Department, Ege University, 35100, Bornova, Izmir, Turkey E-mail:
Water Sci Technol. 2019 Jan;79(2):386-397. doi: 10.2166/wst.2019.065.
In the present study, the sonocatalytic oxidation of Bisphenol-A (BPA) was investigated in the presence of a LaFeO perovskite catalyst. The effects of the reaction temperature, initial pH, catalyst loading, presence of inorganic anions and sonication source (power and frequency) on the removal of BPA using heterogeneous sonocatalytic process were investigated. Under the studied temperature range of 288-318 K, 308 K was selected as the optimum temperature and the highest BPA removal and total oxygen demand (TOC) reduction of, 95.8% and 30.4% were achieved at that temperature. The thermodynamic parameters were calculated in the studied temperature range of 288-308 K. It was seen that an acidic pH of 3.0 was favorable for the BPA oxidation with the highest BPA removal and TOC reduction of 95.4% and 31.5%, respectively. Doubling the catalyst amount from 0.25 g/L to 0.5 g/L increased the BPA removal degree from 81.6% to 90.8%. However, further increase in catalyst amount has no remarkable positive effect on the removal of BPA. The removal of BPA was described by the first order kinetics with an activation energy of 14.9 kJ/mol. The results obtained from this study showed that the LaFeO perovskite catalyst was a good sonocatalyst giving high oxidation rates of BPA.
在本研究中，研究了在LaFeO钙钛矿催化剂存在下双酚A（BPA）的声催化氧化。研究了反应温度、初始pH值、催化剂负载量、无机阴离子的存在以及超声源（功率和频率）对采用多相声催化过程去除BPA的影响。在288 - 318 K的研究温度范围内，选择308 K作为最佳温度，在此温度下实现了最高的BPA去除率和总需氧量（TOC）降低率，分别为95.8%和30.4%。在288 - 308 K的研究温度范围内计算了热力学参数。可以看出，酸性pH值为3.0有利于BPA氧化，BPA去除率和TOC降低率分别最高可达95.4%和31.5%。将催化剂用量从0.25 g/L增加一倍至0.5 g/L，BPA去除率从81.6%提高到90.8%。然而，进一步增加催化剂用量对BPA的去除没有显著的积极影响。BPA的去除符合一级动力学，活化能为14.9 kJ/mol。本研究获得的结果表明，LaFeO钙钛矿催化剂是一种良好的声催化剂，对BPA具有较高的氧化速率。
