氧化石墨烯/膨润土复合材料对废水中铀(Ⅵ)的吸附试验研究

Experimental Study on Adsorption of Uranium(Ⅵ) in Wastewater by Graphene Oxide/Bentonite Composites

以氧化石墨烯(GO)、膨润土(Bent)为原料,十六烷基三甲基溴化铵(CTAB)为表面活性剂,利用超声混合法合成了氧化石墨烯/膨润土复合材料(GO/Bent)。通过静态吸附试验,探讨了p H、投加量、吸附时间、初始浓度对GO/Bent吸附U(VI)的影响。试验结果表明,当p H为6、GO/Bent投加量为0.2 g/L、U(VI)的初始浓度为10 mg/L时、吸附效果达到最好;吸附过程符合Langmuir等温模型和准二级动力学方程。XRD、SEM、EDS分析表明,GO/Bent合成成功,活性位点丰富,离子交换参与了吸附反应。

The graphene/bentonite composites（ GO/Bent） was synthesized by ultrasonic blending with graphene oxide（ GO）,bentonite（ Bent） and cetyltrimethyl ammonium bromide（ CTAB） as surfactants. The effects of p H,GO/Bent dosage,adsorption time and initial concentration on GO/Bent adsorption U（ Ⅵ） were investigated by static adsorption test. The results suggested that the best adsorption result occurred when the dosage of GO/Bent was 0. 2 g/L,the pH was 6,the initial concentration of U（ Ⅵ） was 10 mg/L. The adsorption process could be described by Langmuir isothermal model and the pseudo-second-order kinetic equation. XRD,SEM,EDS analysis indicated that GO/Bent was successfully synthesized. The active sites rich,and ion exchange involved in the adsorption reaction.