Abstract
Thermodynamic calculations for Zn(II)−NH3−Cl−−H2O system have been presented based on free energy minimization algorithms and simultaneous equilibrium principle. Independent predominance diagrams was constructed as a function of Zn(II), NH3, Cl− concentrations versus pH, which indicates that Zn(NH3)2Cl2(s) is the most likely solid phase in near-neutral zinc solutions with high ammonia and chlorine levels. The precipitation trend of Zn(NH3)2Cl2(s) derived from experiments were consistent with the prediction by theoretical calculation. Pure ZnO(s) was successfully synthesized by a two-step hydrolysis approach, in which Zn(OH)1.6Cl0.4(s) was firstly produced from the hydrolytic deamination of Zn(NH3)2Cl2(s) and ZnO(s) was then obtained by the further hydrolytic dechlorination of Zn(OH)1.6Cl0.4(s). Both temperature and water amount played an important role on the hydrolysis procedure. Zn(NH3)2Cl2(s) can be transformed to Zn(OH)1.6Cl0.4(s) completely at room temperature with liquid-solid ratio higher than 9:1, and Zn(OH)1.6Cl0.4(s) can be thoroughly converted to ZnO(s) at 80°C with liquid-solid ratio of 5:1.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
