GO/APT复合材料对水中Cd(II)的吸附研究

将氧化石墨烯(GO)与凹凸棒土(APT)通过插层化学的方法制备了氧化石墨烯/凹凸棒土(GO/APT)复合材料,并研究了其对水中Cd(II)的吸附性能,考察了pH值、温度、吸附时间和吸附剂的用量等因素对吸附性能的影响.研究结果表明:制备的GO/APT复合材料具有优异的吸附性能.在温度为298 K、pH值为7、t=24 h条件下,该复合材料对水中Cd(II)的最大吸附量为216.0 mg·g^-1,其吸附等温线符合Langmuir方程、吸附过程可用准1级动力学方程描述.吸附热力学研究表明该吸附过程属于自发吸热过程.与纯GO和APT粉末相比,GO/APT复合材料对水中的Cd(II)的吸附性能更好.

The Adsorption of Aqueous Cd(II)on the GO/APT Composites

The graphene oxide/attapulgite(GO/APT)composites are prepared by the intercalation method between GO and APT.The adsorption behavior and properties of aqueous Cd(II)on the GO/APT composites are also investigated.The effects of pH,temperature,adsorption time and adsorbent amounts on adsorption properties are investigated in details.The results indicate that the GO/APT composites show high adsorption performance for aqueous Cd(II).The maximum adsorption capacity of Cd(II)on the GO/APT composites is obtained over 216.0 mg·g^-1 under pH of 7 and adsorption time for 24 h at 298 K.The adsorption isotherm of Cd(II)on the GO/APT composites can be described better with Langmuir equation model than Freundlich model,and the pseudo-first-order kinetics equation fits well with the adsorption data.The adsorption process for Cd(II)on the GO/APT composites is an exothermic and spontaneous.Compared with pristine GO and APT powders,such the GO/APT composites can significantly improve the adsorption properties for aqueous Cd(II).