活性炭固载离子液体的制备及对Cr(Ⅵ)的吸附性能研究

Preparation of Activated Carbon Immobilized Ionic Liquid and Its Adsorption Performance to Cr(Ⅵ)

以三乙烯二胺、2-溴乙醇、双三氟甲基磺酰亚胺锂为原料合成了新型双羟基功能化离子液体[C_(2)BHDABCOC_(2)][NTf_(2)]_(2),采用化学键合的方法将其固载在活性炭上,制备了活性炭固载离子液体材料AC-1,通过核磁共振图谱(1HNMR、13CNMR)和傅立叶变换红外光谱(FTIR)确认了离子液体的结构,通过FTIR、X-射线衍射(XRD)、热重(TG)分析对AC-1进行了表征,并研究了AC-1对Cr(Ⅵ)的吸附性能。结果表明,在室温298.15 K、Cr(Ⅵ)初始浓度为100 mg·L^(-1)、pH值为4、吸附时间为35 min、AC-1投加量为0.20 g/20 mL的条件下,AC-1对Cr(Ⅵ)的去除率最高可达74%,远高于未处理的活性炭对Cr(Ⅵ)的去除率,且其吸附过程符合Freundlich等温吸附模型和准二级动力学方程。

Using triethylenediamine,2-bromoethanol,and lithium bistrifluoromethylsulfonimide as raw materials,we synthesized a novel bis-hydroxy functionalized ionic liquid[C_(2)BHDABCOC_(2)][NTf_(2)]_(2),and then prepared the activated carbon immobilized ionic liquid material AC-1 through immobilizing[C_(2)BHDABCOC2][NTf_(2)]_(2) on activated carbon by chemical bonds.Moreover,we confirmed the chemical structure of the ionic liquid by NMR(^(1)H and ^(13)C)spectra and Fourier transform infrared spectroscopy(FTIR),and characterized the AC-1 by FTIR,X-ray diffraction(XRD),and thermogravimetric(TG)analysis.Furthermore,we studied the absorption performance of AC-1 to Cr(Ⅵ).The results show that,under the conditions as follows:the room temperature of 298.15 K,the Cr(Ⅵ)initial concentration of 100 mg·L^(-1),the pH value of 4,the adsorption time of 35 min,and the AC-1 dosage of 0.20 g/20 mL,the removal rate of Cr(Ⅵ)by AC-1 can reach 74%,which is much higher than that by untreated activated carbon.The adsorption process accords with the Freundlich isothermal adsorption model and the pseudo-second-order kinetic equation.