温度和电极互换频率对电解过程中聚合Al_(13)形成的影响  

Effect of Temperature and Exchanging Frequency of Electrode on Al_(13) Polymer Formation by Electrolysis

作　　者：李小忠[1,2] 叶群峰[1] 王连军[3] 

机构地区：[1]浙江师范大学生化学院 [2]南京理工大学化工学院,南京210094 [3]南京理工大学化工学院

出　　处：《无机化学学报》2007年第4期743-747,共5页Chinese Journal of Inorganic Chemistry

基　　金：教育部博士基金(No.B20020288015)资助项目

摘　　要：聚合铝作为一种元机高分子絮凝剂．具有比传统絮凝剂如硫酸铝、氯化铁等效能优异，比有机高分子絮凝剂价格低廉等优点。研究表明，聚合铝絮凝剂实际上是在一定条件下控制铝的水解-聚合-沉淀过程的中间产物．其溶液除存在铝的单体及二聚体外，还存在着Al13（分子式AlO4Al12（OH）24（H2O）12^7＋）以及铝的更高聚合形态，其中Al13被认为是聚合铝中的最有效絮凝形态．具有优越的净水性能。采取有效途径获得高含量Al13聚合形态已成为聚合铝絮凝剂研究和生产的主要追求目标。Al13的惰性电极电解法是实现目标的有效手段之一。曲久辉等用形稳阳极电解制备出Al13占总铝比率较高的聚合氯化铝，但其存在电解过程时间较长（一般在10h以上），Al13易沉积阳极表面导致电极钝化，电解效率较低等问题，并且Al13含量有待进一步提高。Al13 was formed by electrolysis method, using AlCl3 as raw material, Pt as electrodes. The effects of electrolyte temperature and the exchange frequency of the anode and the cathode on the synthesis speed of Al13, the ratio of Al13 in total Al and the electrolysis time needed were studied. The results show that, at the beginning of the electrolysis, the synthesis speed of Al13 and the ratio of Al13 in total Al increase as the electrolyte temperature rises, but decrease later; proper exchanging frequency of the electrodes could remove the passivation of the electrodes led by the aggradation of Al13 on the surface of the anode, thus, enhanced the synthesis speed of Al13 and the ratio of Al13 in total Al, reduced the electrolysis time needed. Under the optimal conditions, the liquid product of high quality with basicity of 82.1% and Al13 polymer accounted for 92.6% of total Al was successfully prepare.

关 键 词：AL13 形成速度 电解温度 电极互换频率 

分 类 号：O614.31[理学—无机化学] X703.5[理学—化学]