柠檬酸钠改性的活性炭对铜离子的吸附性能

摘要

将活性炭(AC)浸渍于5％～15％的柠檬酸钠溶液中,制得柠檬酸钠-活性炭(Nx-AC,x％为柠檬酸钠溶液质量浓度).利用N2吸附法、傅里叶转换红外光谱法和Boehm滴定法表征了Nx-AC的孔结构和表面化学性质,并采用静态吸附法,考察了Nx-AC及吸附饱和再生后的Nx-AC对铜离子的吸附性能.结果表明,表面总酸度对Nx-AC的吸附性能有显著的影响.随着柠檬酸钠浸渍液浓度的增加,Nx-AC对铜离子的吸附容量逐渐增大,其中,吸附剂N15-AC对铜离子的吸附容量可达AC对铜离子的吸附容量的2.76倍.一次再生和二次再生后的N15-AC对铜离子的吸附容量分别可达新鲜N1s-AC的98.2％和95.9％.%Activated carbon (AC) was modified with sodium citrate at a concentration of 5-15% by impregnation to develop a new type of adsorbent, named (Nχ-AC where x is the concentration. Their pore structures and surface chemical properties were characterized by N2 adsorption, Boehm titration and FT-IR. The adsorption of copper ions by the (Nχ-AC and the regenerated ones were investigated through a static adsorption method. Results showed that the carboxyl content had a great influence in the adsorption properties of (Nχ-AC for copper with the adsorption capacity of N15-AC being 1. 76 times higher than the parent AC, which was higher than those of the N5-AC. and the (N10-AC. The adsorption capacity of the regenerated N15-AC s for copper can reach 98.2 and 95. 9% of the original N15-AC for the first and second regenerations respectively.