摘要
采用聚丙烯酰胺凝胶柱层析法分离纯化聚合氯化铝(PAC)中的Al1 3 形态,并采用Al- Ferron逐时络合比色法、透射电镜(TEM)和ZATESIZER测定仪对分离纯化过程中所得3个级分进行了分析表征和电荷特性的研究;采用烧杯实验法对3个级分处理实际和模拟水样的混凝效果进行了对比性研究.Al- Ferron逐时络合比色法和TEM结果表明,在层析法分离中级分随着洗脱时间延长按分子的大小依次洗脱下来,因此截取中间组分即可得到含量95 %左右的纳米Al1 3 形态;电荷特性和混凝效果研究结果表明,第3个级分其他两者具有更好的除浊、除腐殖酸和脱色效果,并且具有更强的电中和能力,因此Al1 3 形态是一种具有较高正电荷和较高的水解稳定性以及宽的pH适用范围,在给水和废水处理中是一种较为有效的Al形态.
The polynuclear keggin species, Al_ 12AlO_4(OH)_ 24(H_2O) 7+_ 12 (Al_ 13), was separated and purified from polyaluminum chloride (PAC) by column chromatography method. The three fractions were characterized by Al-Ferron timed complexation spectrophotometry, TEM and ZATESIZER tester. Jar tests were performed to test the coagulation efficiency of the three fractions in treating synthetic or actual water samples. The results show that the sample purified by the column chromatography method influenced by the size of the species. The bigger molecules were eluted first, then the smaller ones. Al_ 13 would be obtained by taking out the middle fraction. Compared with the other two fractions, the third fraction gives the best results for turbidity, humic acid and color removal, and achieves the highest charge-neutralizing ability. Al_ 13 species is a higher positive-charged species and can be applied in a wide pH range, and it is much more steady in hydrolyzing process and most effective polymeric Al species in water and wastewater treatment.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2005年第3期87-91,共5页
Environmental Science
基金
国家高技术研究发展计划 (863计划 )项目(2 0 0 2AA60 12 90 5 )
高等学校博士点专项科研基金资助项目 (2 0 0 2 0 42 2 0 0 1)
山东省自然科学基金项目(Y2 0 0 2B0 3 ) .
关键词
AL13形态
分离纯化
聚合氯化铝(PAC)
柱层析
Al_ 13 species
separation and purification
polyaluminum chloride (PAC)
column chromatography
