Synthesis Of AgCl Modified Hydrotalcite And Its Photocatalytic Removal Of Phenol From Water

Today,technology drives productivity advancement,followed by rapid economic growth and higher energy demand.Earth life also faces key issues such as environmental pollution.In recent years,Photocatalytic degradation of pollutants in water has become an emerging research direction in the field of environmental chemicals.This paper focuses on the goal of“developing a new type of high-efficiency photo-responsive catalyst”.Ni-Fe LDH,Ni-Al LDH and Ni?OH?₂ are used as carriers to prepare the photocatalyst,respectively,and silver chloride nanoparticles are supported on the carrier.The experiments show that three carrier materials Ni-Fe LDH,Ni-Al LDHand Ni?OH?₂ have almost no photocatalytic activity for degradation of phenol,and the photocatalytic degradation performance of AgCl is also very low,and the unsupported silver chloride nanoparticles are easily agglomerated to deteriorate the repeatability.which is loaded on the nanosheet layer to improve cycle stability and dispersibility.At the same time,the hydrotalcite can adsorb the reaction substrate on the surface and accelerate the photocatalytic degradation rate.The composite material can effectively expand the spectral response range of the material and inhibit the rapid recombination of carriers,thereby improving the photocatalytic performance of the material to some extent.The main works of this research are:?1?Ni-Fe LDH carriers with different NiFe ratios were prepared by double-drop method?a kind of co-precipitation?,and then AgCl/Ni-Fe LDH materials with different loading ratios were synthesized.The influence of the structure and morphology of the material and the effect of AgCl/Ni-Fe LDH on photocatalytic removal of phenol in water was investigated.The effects of nickel-iron ratio,AgCl loading,initial photocatalytic concentration,photocatalyst dosage and pH on photocatalytic performance were studied.Besides,the cycle stability test was performed.The results show that the structure of Ni-Fe LDH after loading is unchanged,and the influence of hydrotalcite with different ratio of nickel to iron is weak,whereas the influence of AgCl loading is large.AgCl/Ni-Fe LDH has good visible light utilization rate and Recycling performance.?2?Ni-Al LDH carrier was prepared by double-drop method?a kind of coprecipitation?,and AgCl/Ni-Al LDH with different loading ratios were synthesized.AgCl/Ni-Al LDH was used as catalyst to photocatalytic removal of phenol in water.The effects of AgCl loading,initial solution concentration,catalyst dosage and pH on photocatalytic performance were investigated.Finally,the cyclic stability test was carried out.The results show that the structure of Ni-Al LDH after loading is unchanged and there are uniform AgCl nanoparticles on its surface.The influence of AgCl loading is large.The composite of AgCl/Ni-Al LDH=0.75 shows the highest photoactivity with degradation rate over 95%at pH=7 in 1 h.The.In addition,AgCl/Ni-Al LDH has good cycle regeneration performance.?3?The prepared Ni?OH?₂ nanosheet carrier was used to synthesize AgCl/Ni?OH?₂with different loading ratios,to investigate the effect of loading on the structure and morphology of the catalyst.It was used to remove phenol from water.The effects of silver chloride loading,initial solution concentration,catalyst dosage and pH on the photocatalytic performance of catalyst were investigated.Finally,the cycle stability test was carried out.The results show that the structure of the catalyst is unchanged after AgCl loading,and the influence of silver chloride loading is better.Besides,AgCl/Ni?OH?₂ has good cycle regeneration performance.