School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou City, Jiangsu 221008, China.
Water Sci Technol. 2011;63(9):1950-4. doi: 10.2166/wst.2011.198.
Series of experiments for phenol degradation with assistance of TiO2 catalyst at pH of 6.5 and temperature of 25 degrees C were conducted using a lab-scale electrochemical reactor constructed in our laboratory. According to the results, at the presence of the TiO2 catalyst the removal of phenol was increased and first-order kinetics could describe the evolution of phenol concentration. For inspecting the relationship between rate constants and dosage of TiO2, two possible kinetics were proposed in this study. Contrasted to the abundant experimental data, a reasonable kinetics was obtained for the estimation of phenol concentration effluent during continuous flow of raw wastewater, especially when the TiO2 dosage was less than 0.5g L(-1). The model obtained from these experiments could employed for the calculation of rate constants at different TiO2 dosage and the necessary dosage of catalyst when a discharge standard was designed.
采用自制的实验室规模电化学反应器，在 pH 值为 6.5、温度为 25℃的条件下，用 TiO2 催化剂辅助进行了苯酚降解的一系列实验。结果表明，在 TiO2 催化剂的存在下，苯酚的去除率增加，苯酚浓度的变化可以用一级动力学来描述。为了考察速率常数与 TiO2 用量之间的关系，本研究提出了两种可能的动力学。与丰富的实验数据相比，当 TiO2 用量小于 0.5g·L(-1)时，该动力学模型可以合理地估算连续流动的原废水出口处的苯酚浓度，特别是当 TiO2 用量小于 0.5g·L(-1)时。这些实验得到的模型可用于计算不同 TiO2 用量下的速率常数，以及在设计排放标准时所需的催化剂用量。
