天祝褐煤腐植酸对Ni^(2+)离子吸附性能研究

Adsorption performance test of lignite humid acid in Tianzhu to Ni^(2+)

通过FTIR、FR分析了天祝腐植酸吸附重金属Ni2+离子前后的红外光谱、荧光强度的变化,对重金属离子Ni2+进行了吸附性能及机理研究。结果表明:在室温条件下(20℃～25℃),吸附最佳pH=6,吸附平衡时间约为5h。符合Freundlich吸附模型,相关系数R=0.9998,特性常数n为2.49。腐植酸对Ni2+有较好的吸附性能,其吸附过程可用Ho准二级反应动力学模型描述。

The infrared spectrum and fluorescence intensity of humic acid from Tianzhu and the change of the spectrum＇properties after adsorption of heavy metal ion Ni^2＋ have been analyzed by FTIR and FR. The property and mechanism of the adsorption of heav- y metal ion Ni^2＋ have been studied. The result shows that under the conditions of room temperature is 20℃- 25℃, optimum pH val- ue is 6, equilibrium time is about 5 hours, the adsorption corresponds to Freundlich adsorption model The correlation coefficient R = 0. 9998, characteristic constant n = 2.49. Humic acid has better performance on the adsorption of Ni2., The adsorption process can