Ding Zhe, Frost Ray L
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, Qld 4001, Brisbane, Australia.
J Colloid Interface Sci. 2004 Jan 15;269(2):296-302. doi: 10.1016/j.jcis.2003.08.043.
Copper was adsorbed onto Ca-exchanged montmorillonite (Cheto clay) under basic conditions. Differential thermogravimetric analysis (DTGA) combined with evolved gas mass spectroscopy (MS) was employed as the principal technology to study the distribution and structure of adsorbed copper species on the montmorillonite clay. The results showed that the original clay was easily rehydrated. After copper adsorption, a step-by-step replacement of hydrated calcium ions by copper-ammonia complex was observed through the gradual decrease of the first DTGA dehydration peak intensity with increasing copper loading. Compared with the original clay, copper loaded samples showed new DTGA peaks assigned to NH(3) and N(2)O. The presence of the N(2)O peak suggested that the loaded copper species were in agglomerated copper oxide form, which dispersed well over the edges and external surfaces of the clay layers.
在碱性条件下，铜被吸附到钙交换蒙脱石（Cheto黏土）上。采用差示热重分析（DTGA）结合逸出气体质谱（MS）作为主要技术，研究蒙脱石黏土上吸附铜物种的分布和结构。结果表明，原始黏土很容易再水化。铜吸附后，随着铜负载量的增加，通过第一个DTGA脱水峰强度逐渐降低，观察到水合钙离子被铜氨络合物逐步取代。与原始黏土相比，负载铜的样品显示出归属于NH₃和N₂O的新DTGA峰。N₂O峰的存在表明负载的铜物种呈团聚的氧化铜形式，其很好地分散在黏土层的边缘和外表面。
