甲壳素对Cr(Ⅵ)的吸附研究

Research on Adsorption of Chitin for Cr(Ⅵ)

采用正交实验法 ,使用甲壳素 (粗制壳聚糖 ) ,研究温度、时间、吸附剂用量、酸度、盐效应对甲壳素吸附水中溶解的 Cr( )离子的吸附过程的影响 ,将实验结果进行极差分析 ,得到较优的吸附条件。实验结果表明 :在 p H =2、30℃、离子强度 5 mmol/ L的条件下 ,甲壳素对 Cr( )的最大吸附量为 13.1mg/ g。根据化学平衡及红外光谱分析结果表明 :甲壳素对 Cr( )的吸附主要是游离氨基静电吸附 Cr2 O2 -7,吸附符合 L

Characteristics of absorption of chitin for Cr(Ⅵ) f rom solution were studied in various conditions of temperature, time, the using quantity of chitin, pH value and salinity by orthogonal design. In condition of pH=2, 30℃, ionic strength 0.005mol/L ,the maxim absorption quantity was 13. 1mg/g. The absorption mechanism was investigated preliminary. Static electvicity attraction between -NH + 3 and Cr 2O 2- 7 was major cause to the abso rption of chitin for Cr(Ⅵ) and the absorption isotherm fit Langmuir absorption isotherm.