环境化学
冯成洪,汤鸿霄.活性羟基铝聚合体形态的Al-Ferron反应动力学与核磁共振光谱分析[J].环境科学学报,2007,27(11):1868-1873
活性羟基铝聚合体形态的Al-Ferron反应动力学与核磁共振光谱分析
- Speciation of the reactive hydroxyl-Al polymers with Al-Ferron reaction kinetics and 27Al NMR spectroscopy
- 基金项目：国家自然科学重点基金(No.20537020)
- 作者
- 单位
- 冯成洪
- 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085
- 汤鸿霄
- 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085
- 摘要：依据不同形态结构铝与Ferron络合反应动力学差异,采用Al-Ferron络合反应动力学曲线拟和计算模式将不同温度下(25℃和80℃)制备的不同碱化度(B=0.5～2.5)的羟基聚合铝溶液中羟基铝分成单体铝(Ala)、活性羟基聚合铝(Alb)和惰性凝胶高聚体铝(Alc)3种形态.此外,结合NMR光谱,Alb进一步分成六圆环结构的快速反应聚合铝(Alb1)和以Al13为主体的慢
- Abstract：Two sets of hydroxyl-Al solutions with the basicity ranging from 0.5 to 2.5 have been prepared under different temperatures (i.e., 25℃and 80℃). Based on the kinetic difference of reactions between Ferron with hydroxyl aluminum of various structures, hydroxyl-Al polymers in these solutions have been differentiated into three categories, i.e., monomer (Ala), reactive hydroxyl polymer (Alb) and non-reactive colloid (Alc) with the Al-Ferron reaction kinetics pattern. Moreover, the Alb fraction has been further differentiated into two kinds of categories as the faster reacting polymers (Alb1) and the slower reacting polymers (Alb2). With the help of 27Al NMR spectroscopy, the former was considered to be composed of some Al6 species, while the latter can be equivalent to Al13. There exists significant difference between the reaction kinetics of Ferron with the above two categories of Al species. The kinetic rates of Ferron reactions with Alb1 and Alb2 are (1～3)×10-2 and (0.6～3)×10-3 respectively. Al-Ferron reaction kinetics can be used to quantify the content of Al13 in solutions in 27Al NMRspectroscopy.
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