The Construction And The Photocatalytic Reduction Of CO₂ Study Of The Organic Electron Donor/acceptor Co-intercalated LDHs Composites

CO₂ as a greenhouse gas,on the green transformation is an important issue in the field of environmental and energy research.Layered metal hydroxide LDHs are a kinds of two-dimensional nanometer layered metal materials,in recent years more and more get the attention of the scientific research workers.Due to the modulability of the interlayer object molecules,more and more complex functional materials are derived from layered double hydroxide.In the photocatalysis,biological monitoring,pharmaceutical and other fields LDHs products appear more and more times.And already some excellent layered double hydroxide composite materials have gone to the market and realized industrialization in the final.In the field of photocatalysis,the researchers have made use of the interlayer assembly of LDHs to realize the interlayer electron transfer between the layers and change the composition of the object molecules.In this way,the restricted photoionization problem in two-dimensional materials is activated,and the separation and transport of light absorption and photoelectric charge are effectively improved.This paper was prepared by in situ oxidation of carbonate ions layered double hydroxide and hydrothermal co-precipitation successful organic small molecule DAS?4,4'-styrene 2 amino 2-2,2'-disulfonic acid?and DNS?4,4'-two nitro two styrene-2,2'-disulfonic acid?inserted into the interlayer of layered double hydroxide.The transfer of optical telephone charge is realized.It has a very high efficiency in catalyzing carbon dioxide.The specific work is as follows:1:A series of NiMn-LDHs solid powders with different atomic ratios were successfully prepared by in-situ oxidation.The NiMn-LDHs was applied to the experiment of photocatalytic reduction of carbon dioxide.In the experiment,the fluorescence of the powder was quenching,indicating that there was a photoelectric charge transfer.It was found in the experiment that this kind of catalyst can reduce carbon dioxide to methanol.The material has a good catalytic efficiency.It shows that this kind of catalyst has a very bright future.2:the organic small molecule DAS?4,4'-diaminodiphenylene-2,2'-disulfonic acid?and DNS?4,4'-2 '-2'-disulfonic acid?were successfully introduced to the layer of Ni2Mn-LDHs by hydrothermal co-precipitation.A series of co-interlayer powder with adjustable DNS/DAS ratio was prepared.This kind of catalyst is applied to photocatalytic reduction of carbon dioxide.And the methanol was found in the product.It was found that the efficiency of photocatalysis was greatly improved by the introduction of organic small molecules.Calculated through the experiment of intercalating DNS and DAS after the forbidden band width of co-intercalated LDHs,found that the conduction band is located in the co2 reduction for other organic products?such as methane,methanol,carbon monoxide?above the reduction potential.It is indicated that the catalyst is suitable for photocatalytic reduction of carbon dioxide.Organic small molecules between the layers act as independent electron donor and electron acceptors.Delayed electron-hole recombination.Because of its low cost,simple production and high selectivity,it has a very bright future in the era of fossil energy depletion.