【摘要】 采用双氨基硅烷偶联剂KH-792对盐酸改性凹凸棒土(HATT)进行改性,使用FTIR、TGA、DSC、XRD和BET等对目标产物(KHATT)进行了表征。研究了KHATT对模拟水样中Cr(Ⅵ)的吸附性能,系统考察了模拟水样中Cr(Ⅵ)的初始浓度、pH值、吸附时间及KHATT用量等因素对Cr(Ⅳ)去除率的影响。结果表明,在KHATT用量为3 g/L、吸附时间为40 min、pH值为5.5的条件下,KHATT对Cr(Ⅵ)的去除率最高,达85.15%;且KHATT经再生后第4次的吸附量仍可达到第1次吸附量的90%以上。对吸附的过程和机理进行了初步探讨。更多还原

【Abstract】 Attapulgite(ATT) modified by the hydrochloric acid(HATT) was grafted by amino-silane coupling agent KH-792(N-beta-(aminoethyl)-gamma-aminopropyl-trimethoxysilane).Thermal behavior and the structure of the grafted HATT(KHATT) were characterized by FTIR,TGA,DSC,XRD and BET.The results showed that the KH-792 molecules were successfully grafted onto the HATT surface.The adsorption of Cr(Ⅵ) onto KHATT in stimulative water was also investigated.The results showed that removal rate of Cr(Ⅵ) in water was relatively high(85.15%) when the loading of KHATT is 3 g/L,pH of the water is 5.5 and the adsorption time of the KHATT is 40 min.The adsorption capacity of KHATT after four times regeneration retained at least 90% of the initial one,showing a high application value.In addition,an adsorption mechanism of KHATT for Cr(Ⅵ) was proposed.更多还原