两种结构不同的纳米羟基聚合铝十三（Keggin-Al13和Mogel-Al13）絮凝形态学研究

The flocculation morphology plays a decisive role in preparing and applying efficient flocculants. The research on Poly Aluminum Chloride (PAC) was mainly focused on Al13 polymer, because many experiment results indicated that Al13 species was the key/effective component of flocculation. In the early stage, our project team concentrated on the preparation and structural study of M-Al13, and confirmed that it can be transformed into the "core-shell" K-Al13 when dissolved in water. This indicated that there was a strong correlation between these two Al-13 polymers. Therefore, this project is planned to focus on the flocculation morphology of M-Al13 and K-Al13, including the study of their solutions' morphological transformation and distribution, their stability and crystallization, as well as their characters and mechanism for flocculation. In the end, a dynamic model and mechanism of their morphological transformation will be built up. The properties of their stability and crystallization, coagulation-flocculation dynamics behavior and mechanism will be grasped. Consequently, prominent contributions can be made to the fundamental research of flocculation morphology and coagulation-flocculation mechanism. It will be improve the efficiency of coagulation technology on water treatment in a more in-depth way.

絮凝形态学的研究对高效絮凝剂的制备及应用有着至关重要的决定作用。无机聚合氯化铝絮凝剂的关键成份为羟基聚合铝十三。本课题组前期主要集中在"板挂式"结构M-Al13的制备及结构研究，并且证实了M-Al13结晶溶于水中形态转变为"笼状"结构的K-Al13，表明两种铝十三具有形态关联性。因此，本项目拟集中于M-Al13与K-Al13的絮凝形态学研究，重点在M-Al13和K-Al13的溶液转化和分布、M-Al13与K-Al13的稳定化和结晶化以及二者的絮凝特征、机理等方面展开研究。最终建立M-Al13和K-Al13形态转化的动力学模型，建立合理的M-Al13和K-Al13形态转化机理，掌握M-Al13的稳定化和结晶化性质，掌握M-Al13和K-Al13的絮凝动力学行为特征，获得M-Al13和K-Al13的凝聚絮凝作用机理。从而促进羟基聚合铝十三絮凝剂在水处理环节的功效。

无机高分子聚合物形态转变及其性能研究是当前研究的重要热点。无机聚合氯化铝中羟基聚合铝十三(Al13)形态是絮凝剂的关键成份。絮凝形态学的研究对高效絮凝剂的制备及应用至关重要。本项目在Al13结构的稳定性，形态转变，重结晶和絮凝性能的研究基础上，证明了溶液中M-Al13向K-Al13的形态转变主要受温度、pH值、溶剂等因素影响，证实了以自发水解法获得的一系列聚合物形态具有比强制水解法获得的形态更优越的絮凝性能和吸附性能。重要突破是在自发水解产物基础上，通过形态调控实现Keggin型结构的聚合氯化物晶体的直接制备，从而解决了，自1960年以来该Keggin型聚合氯化物只能间接地通过硫酸盐沉淀法才能获得晶体的难题。