水中橙黄Ⅱ的粉煤灰吸附特征研究

ADSORPTION CHARACTERISTICS OF ORANGE Ⅱ DYE IN WATER BY FLY ASH

以火力发电厂燃煤废弃粉煤灰作吸附剂,通过批式试验,研究了粉煤灰对水中阴离子型染料橙黄Ⅱ的吸附去除规律。结果表明,粉煤灰对水中橙黄Ⅱ的吸附动力学遵循1级反应动力学模型,等温吸附服从Freundlic模型;粉煤灰投加量较大时,在相同橙黄Ⅱ含量条件下粉煤灰投加量对粉煤灰吸附容量的影响较小;在pH=4～12时,粉煤灰吸附水中橙黄Ⅱ的Freundlic模型参数a、b呈较好的线性关系;粉煤灰对水中橙黄Ⅱ的吸附总体上属于放热过程,温度在25℃时已明显构成对吸附的不利影响;随着离子强度的增加,粉煤灰对水中橙黄Ⅱ的吸附性能增强。

Using the ash of abandoned burned coal of thermal power plant as adsorbent, the adsorption and removal of the anionic dye orange Ⅱ in the water by fly ash was studied in the batch experiments. The results showed that the adsorption of the anionic dye orange Ⅱ followed the pseudo-first-order reaction kinetics model; The isothermal adsorption obeyed Freundlic model. The added amount of fly ash had less effect on the adsorption capacity of orange Ⅱ at the same concentration of the dye when fly ash was used with enough dosage. At the pH of 4-12, the parameters of a and b in Freundlic model had a good linear relationship; the adsorption of orange Ⅱ in water by fly ash belonged to the exothermic process in general and the adsorption capacity decreased obviously at 25 ℃. With the increase of ionic strength, the adsorption was strengthened.