【摘要】 通过测定汞在吉林省双阳泥炭和黑龙江省洪河农场泥炭吸附等温线,利用热力学函数关系计算汞在两种泥炭等量吸附焓、吸附自由能和吸附熵,结果表明汞在泥炭中的吸附是配位离子吸附,且反应极易发生,由于泥炭残体组成和性质的差异,汞在两种泥炭中的吸附性能也有一定区别。最后讨论了泥炭吸附汞的热力学基本原理及由此所产生的汞对沼泽湿地环境和生物的效应。更多还原

【Abstract】 <abstract>e isotherms of mercury adsorbed on two kinds of peats collected from Honghe Farm Plain in Hei-longjiang Province and Shuangyang district of Changchun city, Jilin Province were respectively measured. The sorption Enthalpy, Free Energy and Entropy of mercury adsorbed on two kinds peats were calculated by using the thermodynamics functions and equations. The results showed that both isotherms of mercury adsorbed on two kinds peats conformed to freundlich equation, and correlative coefficients were 0.8966 - 0. 9915. The sorption capacities of mercury adsorbed on two kinds peats were compared and analyzed with the method of Surface Chemistry. Used covering factor (θ) and some environmental chemistry to explain the course of mercury adsorbed on peat. The material composing and the physi-chemical properties of the two kinds peats were analyzed. Although they belonged to low-horizon peat, there were big differences in material composing and decomposed degree. These differences caused the mercury sorption capacities on peat to be different. The thermodynamics mechanism of mercury adsorbed on peat was discussed and concluded that the mercury sorption on peat increased with the temperature decreasing. The calculated results showed that the sorption enthalpy is about - 130 - - 90 kJ/mol. It shoved that the procedure of mercury adsorbed on peat was an emission hot course. The sorption of mercury on peat is linked by conjugate bond and the sorption reaction happens easily. Furthermore the effect of mercury on the environment was discussed and the conclusions were that mercury could be adsorbed on peat easily and largely in low temperature and could be desorp-tion with temperature increasing.更多还原