Valente José Pedro S, Padilha Pedro M, Florentino Ariovaldo O
Department of Chemistry and Biochemistry-IB/UNESP, C. Postal 510, 18618-000 Botucatu, SP, Brazil.
Chemosphere. 2006 Aug;64(7):1128-33. doi: 10.1016/j.chemosphere.2005.11.050. Epub 2006 Jan 6.
An investigation was made on the adsorption and kinetics of photodegradation of potassium hydrogenphthalate in an aqueous suspension of TiO(2). Two models, Langmuir and Freundlich, were used to describe the adsorption process and the model proposed by Langmuir-Hinshelwood (L-H) was employed to describe the kinetics of the photodecomposition reactions of hydrogenphthalate. The results of the adsorptions were fitted to the models proposed by Langmuir and Freundlich. Adsorption was found to be a function of the temperature, with adsorption capacity increasing from 2.4 to 4.5 mg/g when the temperature rose from 20 to 30 degrees C. The kinetic model indicates that the rate constant, k, of the first order reaction, is high in the 10.0 to 100 mg/l interval, which is coherent with the low value of the adsorption constant, K. The results fitted to the L-H model led to an equation that, within the range of concentrations studied here, theoretically allows one to evaluate the photodegradation rate.
研究了邻苯二甲酸氢钾在TiO(2)水悬浮液中的吸附及光降解动力学。采用Langmuir和Freundlich两种模型描述吸附过程，并用Langmuir-Hinshelwood（L-H）提出的模型描述邻苯二甲酸氢根光分解反应的动力学。吸附结果与Langmuir和Freundlich提出的模型拟合。发现吸附是温度的函数，当温度从20℃升至30℃时，吸附容量从2.4mg/g增加到4.5mg/g。动力学模型表明，一级反应的速率常数k在10.0至100mg/l区间内较高，这与吸附常数K的低值相一致。拟合到L-H模型的结果得到一个方程，在此处研究的浓度范围内，该方程理论上允许评估光降解速率。
