温度对沉积物中磷吸附的影响研究

Temperature effects on the sorption of phosphate

在10℃、25℃和35℃条件下,通过辽河干流两个采样点(马虎山、盘锦兴安)的表层沉积物中磷吸附的实验,研究温度对沉积物吸附磷的影响。结果表明:沉积物对磷的吸附是一个吸热反应,吸附量随温度升高而增加。马虎山、盘锦兴安沉积物吸附磷的标准熵变分别为9.64和10.24,标准吸附热分别为7.56和7.90。温度对马虎山沉积物吸附磷的影响相对较小。另外,表示沉积物对磷吸附结合能大小的K值与温度有关,温度越高,磷的吸附强度越大,磷被吸附得越牢固。

The adsorption of phosphorus on two samples of sediments taken from LiaoHe river at 283K and 308K were studied. The results indicated that the phosphorus adsorption was endothermic reaction, as the phosphate adsorption rate increased along with the increase of temperature. S0 of the sediments from the Mahushan and Xing’an were 9.64 and 10.24, H0 were 7.56 and 7.90. The effect of phosphate adsorption by temperature was lower for the sediment from the Mahushan. In addition, temperature and K that mean the binding energies of the phosphate adsorption are related. The higher the temperature is, the greater the intensity of the phosphate adsorption would be, the more secure the phosphate adsorption would be.