新型肌酐吸附剂的研究

STUDY ON A NEW ADSORBENT FOR CREATININE

以玉米淀粉和 3 ,5 二硝基苯甲酰氯为原料合成了一种新型肌酐吸附剂并采用红外光谱、元素分析、核磁共振等手段对产物化学结构进行了表征 ,考察了 3 ,5 二硝基苯甲酸淀粉酯对肌酐的静态吸附性能 ,建立了 3 ,5 二硝基苯甲酸与肌酐络合产物的结构模型 ,初步探索了 3 ,5 二硝基苯甲酸淀粉酯对肌酐吸附机理 .结果表明 ,3 ,5 二硝基苯甲酸淀粉酯对肌酐有较好的吸附性能 ,吸附在 4h内完成 ,吸附容量随 3 ,5 二硝基苯甲酸淀粉酯的取代度的增大而提高 ;在肌酐溶液浓度为 0～ 3 0 0mg·L- 1 ,吸附容量亦随肌酐浓度增大而提高 ;吸附温度从 1 9℃升高到 3 7℃时 ,吸附容量呈现降低的趋势 ;吸附容量随溶液pH值的增长呈现先增加后降低的趋势 ,在pH =8左右达到最大 ;在肌酐溶液浓度为 1 0 0mg·L- 1 、吸附温度为 3 7℃、介质pH =7的条件下 ,3 ,5 二硝基苯甲酸淀粉酯对肌酐的最大吸附量达 2 5mg·g- 1 .

A new adsorbent for creatinine by starch esterification with 3,5-dinitrobenzoyl chloride DNBZ-ST was prepared. The chemical structures of DNBZ-ST products were characterized by FTIR, elemental analysis and (13) C-NMR. The adsorption properties of DNBZ-ST for creatinine were examined. A structure model of complex of 3,5-dinitrobenzoic acid with creatinine was proposed, and the adsorption mechanism was explored fundamentally. Results showed that starch 3, 5-dinitrobenzoate has good adsorption properties. The adsorption is complete in 4 It. The adsorption capacity increases with the degree of substitution of adsorbent, as well as with the creatinine concentration. However, the concentration has no apparent effect on adsorption capacity, when the creatinine concentration is higher than 300 mg.L-1. The adsorption capacity decreases with temperature in the range from 19degreesC to 37degreesC The adsorption capacity first increases and then decreases with the increase of,the pH value and has a maximum around pH = 8. The adsorption capacity may reach similar to 25 mg of creatinine per gram of adsorbent at 37degreesC pH = 7 and a creatinine, concentration of 100 mg.L-1.