摘要
根据表面化学反应平衡原理，推导出了一个描述液－固吸附的质量作用模型：ｑ＝。上式兼有Ｌａｎｇｍｕｉｒ、Ｆｒｅｕｎｄｌｉｃｈ方程的特性。Ｋ_ａ是吸附反应的平衡常数；ｎ与覆盖一个表面活性点位的吸附质分子或离子数有关，可用于判断反应机理，并在一定程度上可表示反应的强度；Ｍ则是吸附剂表面的活性点位的总数；吸附容量由Ｍ和ｎ共同决定。将该模型应用于土壤体系，上述参数较好地解释了金属Ｃｕ、Ｚｎ在红壤、黄棕壤、灰潮土上的吸附特点。
A mass-action model used to describe adsorption at the solid/solution interface was derived from the surface chemical reaction and equilibrium principles:The model has the characteristics of both langmiur and Freundlich equations. Ka is equilibrium constant of adsorption reaction and could be regarded as the intensive index of the adsorption; n indicates the number of adsorbed molecules or ions covering each active site on the surface , it is helpful to decide the mechanism of reaction; M is refereed to as the sum total of active sites on the surface of adsorbent; the adsorption capacity is determined by both M and n concurrently.The model was applied to the adsorption of Cu and Zn on red soil,Yellow-brown soil and grey chao soil.
出处
《环境科学学报》
CAS
CSSCI
CSCD
北大核心
1996年第4期425-430,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金
中国科学院南京土壤研究所土壤圈物质循环开放实验室资助
关键词
土壤
吸附
重金属
质量作用模型
adsorption, heavy metals , mass-action model, soils.
