汞在泥炭上的吸附动力学研究

采用批次法研究了汞在三江平原泥炭和吉林双阳泥炭上的吸附动力学特征及温度、pH值对吸附的影响,实验表明:在相同的实验条件下,三江平原泥炭对汞的吸附速率小于吉林双阳泥炭;温度升高加快泥炭吸附汞的反应速度;两种泥炭对汞的吸附速率受pH值的影响明显且都在pH6.0左右具有最大的吸附量;在酸性介质内,介质的pH值升高,利于泥炭对汞的吸附;两种泥炭对汞的吸附动力学用Hill方程描述最为合适。湿地泥炭土壤较高的吸附容量,以及湿地低温和适当的pH都利于湿地对汞的累积。

Study on Kinetics of Abdsorption and Desorption of Mercury on Peat

The kinetics characteristics of mercury absorption on the Sanjiang Plain and Jilin Shuangyang peat, and the influences of temperature and pH were studied using the method of Batch. The results showed that the rate of mercury absorbed on the Sanjiang Plain peat was slower than that on Jilin Shuangyan peat. The increase of temperature could accelerate the rate of the mercury adsorbed on peat. The rate of the mercury absorption on peat was affected by pH value of the solution. The maximum absorption was got on the point of pH 6.0. High pH (pH<7) was benefit to the mercury absorption on peat Hill equitation was fit to the kinetics of mercury absorbed on peat. The absorption quantity of peat to mercury inmire wetlands was high. Low temperature and fit pH of wetland was benefit to the storage of mercury in wetland soil.