Preparation Of Ternary Ag₃PO₄ Nanocomposite And Study On Its Catalytic Degradation Performance Of Nitro Pollutants

The development of scientific research in materials,chemistry,etc.is ultimately to enable human beings to survive and live better.However,the problem of serious water pollution has attracted more and more attention,and water pollution has become one of the most concerned and most urgent environmental problems in the 20th century.Thus,the research of nanomaterials in the field of wastewater-treatment not only can satisfy the needs of society,but also make a contribution in the field of catalysis.In this paper,the in-situ deposition method was used to design two different composite ideas,to better load silver phosphate particles and then to obtain a new type of composite catalyst,tested and explored the catalytic degradation ability of o-nitroaniline and p-nitrophenol.Polypyrrole and polyaniline are widely used in composites with other materials due to their low price and easy preparation,light weight and good electron transfer properties.By controlling the raw material pyrrole and aniline in different volume ratios（4:1,3:2,1:1,2:3,1:4）in the polycondensation reaction,polypyrrole and polyaniline（PPy/PANI）with different morphologies can be synthesized,and then combine Ag₃PO₄ with it by in-situ deposition to generate different ratios of Ag₃PO₄/PPy/PANI.Through various characterization methods and catalytic degradation tests to study and evaluate the catalytic effect of this series of materials with different proportions.The results show that Ag₃PO₄/PPy/PANI,which is produced at a ratio of 1:1 between pyrrole and aniline,has a better catalytic efficiency on dyes,and the effect of catalysis of 2-NA by the catalyst is better than that of 4-NP.On the basis of the above research,in order to resolve for the lack of catalytic efficiency and improve the efficiency of catalyzing p-nitrophenol（4-NP）,a new type of catalyst Ag₃PO₄/Ni-Ti LDH/GO which was successfully prepared by a simple in-situ deposition method:a nickel-titanium layered metal-graphene oxide（Ni-Ti LDH/GO）heterojunction bridged with silver phosphate（Ag3PO4）.And also carried out various characterization and catalytic tests on the samples.The results show that the catalyst has excellent catalytic performance for 2-NA and 4-NP.In addition,the precursor composite materials Ag₃PO₄/GO and Ni-Ti LDH/GO were also tested for comparison.As a result,Ag3PO4/Ni-Ti LDH/GO composite has better catalytic performance and cycle performance.Moreover,the pseudo-first-order rate constants k that can be used to evaluate the catalytic effect were calculated,respectively.And the catalyst has the best degradation efficiency for 4-NP solution.In addition,the complex and irregular surface morphology of Ni-Ti-LDH/GO can be clearly seen,which provides an ideal carrier for the in-situ deposition and stabilization of Ag₃PO₄nanoparticles.The material has good catalytic performance in the degradation of nitro compounds.And the experimental results are basically in line with experimental expectations,which provides a different idea for studying new high-efficiency catalysts.