水热炭接枝紫脲酸铵对铀(Ⅵ)的吸附性能

摘要

The hydrothermal carbon(HTC) was obtained at 180 ℃ for 36 h with glucose solution.A novel Mu-HTC adsorbent was prepared by murexide(Mu)-assisted graft of HTC via thermal treatment,amidation and grafting of Mu in sequence.The analysis of Boehm titration indicate that the new adsorbent has 6 times the amount of carboxyl groups than raw HTC.Fourier transform infrared spectroscopy indicate that Mu is successfully grafted to the surface of HTC.The morphologies and diameters of HTC do not change in the progress of functionalization by the SEM.The theoretical sorption capacity is 102.05 mg/g for uranium(Ⅵ) according to Langmuir adsorption isotherm equation at practical experiment conditions.The experiments of competitive ions indicate that the Mu-HTC selectively absorbs uranyl ions (accounting for about 72.8％ of total adsorption capacity) in a simulated nuclear industrial waste water.The adsorbent can be used to purification of waste water and recovery of uranium.%选用葡萄糖为炭源,在180℃下反应36h得到水热炭(HTC),后经热处理、胺化和接枝紫脲酸铵合成了一种新的水热炭基吸附剂(Mu-HTC).通过Boehm滴定分析,热处理后的水热炭表面羧基含量增加近六倍;红外光谱分析证实紫脲酸铵被成功接枝在水热炭上;扫描电镜监测整个合成过程,水热炭球的形貌和粒径没有发生显著变化.根据Langmuir等温吸附方程,该吸附剂对铀(Ⅵ)理论吸附容量为102.05 mg/g.在模拟放射性废液的共存离子竞争吸附中,对铀(Ⅵ)的吸附容量占总吸附容量的72.8％,具有较好的选择性.该吸附剂可用于含铀废水的净化处理或从水体中回收铀资源.