砷酸铁/针铁矿核壳结构的形成机制及其在低Fe/As比除砷固砷中的应用

Aiming to the cost barriers for the application of the ferric arsenate in the removal and immobilization of arsenic caused by the high Fe/As ratio, the iron arsenate/goethite core-shell structure with the dynamic stability in Fe3+-AsO43- - H2O system was designed to replace the traditional FeAsO4.xFe(OH)3 mixed phase thereby to improve the utilization efficiency of Fe element. By studying on the textural structure, physicochemical properties, formation mechanism and adjusting methods of the goethite shell, this project would clarify how the composition, phase, morphology, thickness, density of the goethite shell influence the kinetic stability of iron arsenate in the core. The new methods and technology with the low Fe/As ratio（Fe/As<2）would be developed on basis of the kinetic stability of the core-shell structure to reduce the cost of arsenic removal and immobilization, thereby to promote the application of iron arsenate in the arsenic pollution treatment in our country.

针对砷酸铁高Fe/As比除砷固砷工艺在推广应用中存在的成本障碍问题，本项目设计了一种在Fe3+-AsO43- - H2O体系中具有动力学稳定性的砷酸铁/针铁矿核壳结构，并以此替代传统的碱性砷酸铁FeAsO4.xFe(OH)3混合相来提高Fe元素的利用效率；通过对该核壳结构的组织结构、理化性质、形成机制以及调控方法进行系统研究，阐明壳的组成、物相、形貌、厚度、致密度等因素对核中砷酸铁动力学稳定性的影响规律，利用该结构的动力学稳定性研究低Fe/As比（Fe/As<2）条件下除砷和固砷的新方法与新工艺，从而降低砷酸铁的除砷和固砷成本，推动砷酸铁在我国砷污染治理的推广应用。

针对砷酸铁高Fe/As比除砷固砷工艺在推广应用中存在的成本障碍问题，本项目设计了一种在Fe3+-AsO43--H2O体系中具有动力学稳定性的砷酸铁/针铁矿核壳结构，并以此替代传统的碱性砷酸铁FeAsO4.xFe(OH)3混合相来提高Fe元素的利用效率；通过对该核壳结构的组织结构、理化性质、形成机制以及调控方法进行系统研究，阐明壳的组成、物相、形貌、厚度、致密度等因素对核中砷酸铁动力学稳定性的影响规律，利用该结构的动力学稳定性研究低Fe/As比（Fe/As<2）条件下除砷和固砷的新方法与新工艺，从而降低砷酸铁的除砷和固砷成本，推动砷酸铁在我国砷污染治理的推广应用。