WO₃Nanoplates And Ag₂ZnGeO₄Particles

Novel applications of nanostructures in biotechnology, energy, catalysis andenvironmental governance catalysis, electronics, photonics and bionanotechnologyare driving the development of synthetic approaches to modulate the morphology andchemical composition of nanostructures. Among various nanomaterials,nanoplate-like materials and multinary ones are of great importance because of theirunique morphology, composition and tremendous promising applications. Chemicaltransformation synthesis can convert one material into another with good control ofthese parameters, while the using of it for the fabrication of nanoplates and multinarynanoparticals are still challenges.In this thesis, we used WOx-EDA inorganic-organic hybrid nanobelts asprecursors, and with following treatment of acidolysis and calcination, we finallyprepared inorganic WO3nanoplates; Zn2GeO4-DETA inorganic-organic hybridnanoplates reacted with Ag+to generate inorganic Ag2ZnGeO4nanoparticles. SEM,EDX, XRD, IR, TEM and HRTEM were used to systematically characterize themorphology, structure and composition of products. Meanwhile, we conductedtime-dependent experiments to analyze the mechanism of the two chemicaltransformation processes. Further investigation revealed the high performance ofthese two products for photocatalytic degredation of organic pollutant. The workincludes that:1With the treatment of H+in acidic environment, WOx-EDA inorganic-organichybrid nanobelts were converted into H2WO4nanoplates. Once calcinated, they werefinally converted into inorganic WO3nanoplates. It was found that temperature, timeand concentration of acidic treatment played crucial roles in the morphology andcrystalline of final WO3nanoplates. The as-prepared WO3nanoplates had exceptionalability to photodegrade RhB.2Zn2GeO4-DETA nanoplates were transformed into Ag2ZnGeO4quaternaryinorganic nanoparticles via cation exchange reaction with Ag+. With thorough analysisof time-dependent experiments, we clarified the successful transformation fromnanoplate-like inorganic-organic hybrid precursors into inorganic nanoparticles. Also,these as-prepared Ag2ZnGeO4have predominant ability in photodegradation of RhB.