Study On Preparation For Inorganic Ion Exchanger LATP And Its Ion Exchanger Behavior For Ag~+

It is well known that silver plays an important role in industrial raw materials, which is widely used in many fields. However, in recent years, we focus on how to recycle the silver in industrial waste efficiently with the silver decreasing productivity year by year. It is a relatively simple approach to adopt the exchange agent except for finding the right adsorbent. So far, with the development of metallurgy and electronics industries, it is a rapid urgent task to efficiently and quickly recycle the silver in industrial waste. Therefore, it is a great practical significance for us to investigate high quality and inexpensive effects silver ion exchange agent.In this paper, we present the new silver ion exchange agent Li1.3Al0.3Ti1.7(PO4)3(LATP) of synthesis, characterization and performance according to the method of solid-state reaction, sol-gel and organic foam impregnation. Some conclusions are as follows:In the aspect of preparation, the structure of LATP is similar to the LiTi2(PO4)3when the added amount of lithium carbonate is equal to2%-6%of the theoretical amount by using solid-state reaction. However, the X-ray diffraction pattern of LATP mixed with some impure diffraction peaks when the lithium carbonate is excessive. The structure of LATP is similar to the LiTi2(PO4)3by using the method of sol-gel. In a way, the method of sol-gel has the advantages of short calcining time, low temperature synthesis and fine powder particles except for high cost of materials compared to solid-state reaction.The experiment has measured the ion exchange capacity of LATP which is synthesized by three methods towards Ag+in0.1mol·L-1solution of AgNO3, the exchange capacity was3.352×10-3mol/g by the method of solid-state reaction, the method of organic foam impregnation is3.347×10-3mol/g, and the method of sol-gel is3.326×10-3mol/g.We study the pH value, particle size and the concentration of silver nitrate on the effect of LATP of Li+/Ag+exchange capacity the method of solid-state reaction. The results demonstrate that the value of pH has no effect on the LATP exchange capacity of Li+/Ag+ Meanwhile, it is exhibit the better performance the exchange of Li+/Ag+of LATP with the smaller the powder particle size, the higher the concentration of silver ions.In dynamics, we established the mathematical models, which is described the LATP of Li+/Ag+exchange process behavior. The experimental results show that the exchange process accord with the model of condensation, we study the exchange dynamics kinetics of LATP Li+/Ag+under the conditions of different temperature and different qualities of lithium carbonate. The results show that temperature, it is beneficial for the LATP on Li+/Ag+exchange reaction when the added amount of lithium carbonate is equal to the theoretical amount of102%-106%with high temperature.In thermodynamics:we measured the exchange balance of the Li+/Ag+of LATP by the method of static-exchange under different temperatures, and the LATP is synthesized by the method of solid-state reaction. The results show that LTAP have high selectivity to Ag+, and it is beneficial for the Li+/Ag+of LATP ion exchange reaction in a certain temperature range, the value of ΔHm is76.6kJ/mol in the Li+/Ag+ion exchange reaction of LATP.