纳米钛酸钙对钯(Ⅱ)的吸附性能研究

Study on the Adsorption Capacity of Nano-calcium Titanate Powder for Palladium(Ⅱ) in Water

研究了纳米钛酸钙对水中钯的吸附性能,考察了介质的pH值、吸附时间和钯的初始浓度等条件对吸附的影响,探讨了钯的解吸回收及吸附剂的再生条件,并用于废水中钯的吸附富集回收。结果表明,当吸附介质pH值为5~8时,振荡吸附5 min吸附达到平衡,吸附量随钯的初始浓度的增大而增加,实验条件下,饱和吸附量可达49.78 mg/g。被吸附的钯可用5 mL 1 mol/L硝酸完全洗脱回收。对钯的富集因子超过100。将该方法应用于水中钯的吸附富集和回收,结果满意。

The adsorptive potential of nano-calcium titanate for palladium ion was investigated, and optimum experimental parameters for the adsorption and elution of the palladium, such as pH value of medium, contact time, eluent and coexisting ion, were studied. The results show that when pH is in the range of 5-8, the adsorption time is 5 min, the adsorption can reach to the equilibrium, and the higher palladium initial concentration ,the bigger the adsorption capacity; Under experimental conditions, the saturation adsorption capacity can reach to 49.78 mg/g. The palladium ion adsorbed on the nano-calcium titanate powder can be completely eluated by using 1 mol/L nitric acid. The enrichment factor is more than 100. The method has been applied into the recovery of palladium ion in industry waste water, satisfactory results have been gained.