凹凸棒土高温改性的研究

Study on the high temperature modification of attapulgite

为提高凹凸棒土的吸附性能,通过高温对其进行改性,将其应用于吸附含铬废水。结果表明,高温改性可以脱去凹凸棒土中的吸附水、沸石水和部分结晶水,比表面积随改性温度的提高先增大后减小,当温度为350℃时,可以获得最大的比表面积140.7 m2/g,其Cr6+去除率可以达到80%。

In order to promote the adsorption capability,high temperature modification of attapulgite was studied.The attapulgite were used to deal with in wastewater with Cr6＋.The results showed that the oncave,zeolite water,part of crystal water and the structure of water can be removed at high temperature.With the increase of the modification temperature,the surface area of attapulgite increased and then decreased later.When the temperature was 350 ℃,the maximum surface area of 140.7 m2/g was achieved.The adsorption rate of Cr6＋ in wastewater over passed 80%.