通过N2吸附-解吸附、表面电位测试及透射电镜等手段研究了湖南辰溪仙人湾埃洛石的表面吸附性能.本区埃洛石属中空管体,吸脱附等温线属于Ⅱ类等温线.由BJH方程计算孔径在2.5～200 nm之间均有分布,集中在3～40 nm之间,由HK方程计算微孔集中分布在0.6～1.9 nm之间.天蓝色埃洛石孔隙丰富,以中微孔为主,纯白色埃洛石孔隙发育程度相对较低,以微、中、大孔为主.埃洛石的表面零电点接近pH=2.在pH =5～10之间,Zeta 电位趋向稳定在-40mV左右.本区埃洛石比表面积为35～87 m2/g,平均孔径为16.20～30.12 nm,具有很强的气体吸附能力和离子交换吸附能力.天蓝色埃洛石表面吸附性能最强,是优先考虑的开发对象.%The surface adsorption capability of Xianrenwan halloysite from Chenxi in Hunan Province was studied through the nitrogen adsorption-desorption experiment at 77.35 K by using such means as surface potential measurement and transmission electron microscope (TEM). The morphology of halloysite is hollow tubule. The isotherm of nitrogen of the adsorbs-desorption for halloysite is type II isotherm. The pore dimension distribution of halloysite by BJH equation is 2.5~200 ran, and is concentrated in the range of 3 ~ 40 nm. The micro-pore dimension distribution of halloysite by HK equation is concentrated in the range of 0.6~ 1.9 nm. The azure halloysite has abundant pores, which are mainly meso-pores and micro-pores. The white hallosite has relatively less pores, being mainly micro-pores, meso-pores and macro-pores. The surface point of zero charge is close to the pH value of 2. Zeta potential tends to be stable at about - 40 mV. The halloysite has large specific areas(35~ 87 m2/g)and abundant pores(16.20~30.12 nm)so that its capacity for gas adsorption and ion exchange is very strong. Priority should be given to the exploitation of the azure halloysite because it has best adsorption capability.
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