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采用批次法研究了汞在三江平原泥炭、吉林双阳泥炭上等温吸附特征及介质pH值、背景离子浓度的影响。实验结果表明:两种泥炭吸附等温线均同时符合Langmuir和Freundlich等温吸附方程,而与Langmuir方程的拟合效果更好; 在溶液汞浓度相同时,温度升高,泥炭对汞的吸附量降低;在相同的条件下,三江平原泥炭对汞的吸附量大于吉林双阳泥炭对汞的吸附量;两种泥炭对汞的吸附量受pH值的影响明显且都在pH 6.0左右具有最大的吸附量;在酸性条件下,吸附介质的pH值升高利于泥炭对汞的吸附;介质的离子浓度升高,可以使两种泥炭对汞的吸附量迅速降低。
The batch method was used to study the isothermal adsorption characteristics of mercury on peat in the Sanjiang Plain and peat in Jilin Shuangyang, as well as the influence of pH value and background ion concentration. The experimental results show that the adsorption isotherms of both peat samples are in good agreement with the Langmuir and Freundlich isotherms and the Langmuir equations, respectively. When the concentration of mercury is the same, the adsorption of mercury decreases with the increase of temperature. Under the same conditions, the amount of mercury adsorbed by peat in the Sanjiang Plain was greater than that of the peat of Jilin Shuangyang. The adsorption capacity of mercury by both peat was significantly affected by pH and both had the maximum adsorption amount at about pH 6.0. Under acidic conditions, the increase of pH value of adsorption medium is favorable for the adsorption of mercury on peat. The higher the ion concentration of medium, the rapid decrease of mercury adsorption on the two kinds of peat can be achieved.