Design And Construction Of Sulfide/Biological Structured Carbon Photocatalytic Composites

For a long time,the topic of energy has always been the focus of attention from all walks of life.In order to solve the problem of the decline of traditional fossil energy,researchers have proposed to convert solar energy into chemical energy to alleviate this situation.An important way to convert solar energy into chemical energy in hydrogen is to use II-IV sulfide semiconductor as a catalytic medium,and water as a reactant by photocatalytic reaction.However,metal sulfide semiconductors have some disadvantages compared with other photocatalytic semiconductor materials,such as prone to agglomeration;more common and serious photo-corrosion effects;lowe ffective separation efficiency of semiconductor photogenerated electron-hole pairs;inefficient photocatalytic reaction and so on.Biological structured carbon is an amorphous carbon material with a special microscopic appearance and excellent electrical conductivity.Although the performance has a certain difference compared with graphene and the derivatives,the biological structured carbon material has a low synthesis cost,a safe activation process and high yield.In addition,the biological structured carbon material has considerable strength and not easy to be broken;the irregular structure existing on the surface of the material can provide active sites with a confinement effect.Taking into account various factors,we have proposed to use bamboo leaves as a biological template to prepare biological structured carbon,and load metal sulfides to synthesize metal sulfide/biostructure carbon photocatalytic composite materials.The effects of preparation methods,sulfide species and concentration on the morphology,elements and photocatalytic properties of the materials are investigated.The main research contents and analysis results are as follows:1,Four different concentrations of cadmium sulfide/biological structured carbon photocatalytic composites are prepared by simple impregnation calcination method,hydrothermal calcination method and calcination hydrothermal method.The experimental results show that the introduction of biological structured carbon in the system can effectively enhance the toughness of the material and enhance the effective separation of photogenerated electron-hole pairs in the semiconductor;Moreover,the degree of chelating agent involved in semiconductor synthesis has a regulatory effect on the exposed crystal plane of the material;The forbidden band widths of the three products are calculated by formula to be 2.23 eV,2.27 eV and2.10 eV,respectively;The photo-generated electron-hole pairs of the three materials are superior to that of standerd materials;The photocatalytic performance test shows that after 6 hours of illumination,the CdS/biological structured carbon photocatalytic composite with a concentration of 0.20 mol·L^-11 prepared by calcination hydrothermal method has better hydrogen production,which is 268.19μmol.In addition,the material has a strong recyclability.2,Four different concentrations of molybdenum disulfide/biological structured carbon photocatalytic composites are prepared by simple impregnation calcination method,hydrothermal calcination method and calcination hydrothermal method.The experimental results show that the introduction of biological structured carbon in the system can effectively enhance the toughness of the material and enhance the effective separation of photogenerated electron-hole pairs in the semiconductor;Moreover,the degree of chelating agent involved in semiconductor synthesis has a regulatory effect on the exposed crystal plane of the material;The forbidden band widths of the three products are calculated by formula to be 1.66 eV,1.65 eV and1.64 eV,respectively;The photo-generated electron-hole pairs of the three materials are superior to that of standerd materials.The photocatalytic performance test shows that after 6 hours of illumination,the MoS₂/biological structured carbon photocatalytic composite with a concentration of 0.20 mol·L^-11 prepared by calcination hydrothermal method has better hydrogen production,which is 492.12μmol.In addition,the material has a strong recyclability.3,Four different concentrations of zinc sulfide/biological structured carbon photocatalytic composites are prepared by simple impregnation calcination method,hydrothermal calcination method and calcination hydrothermal method.The experimental results show that the introduction of biological structured carbon in the system can effectively enhance the toughness of the material and enhance the effective separation of photogenerated electron-hole pairs in the semiconductor;Moreover,the degree of chelating agent involved in semiconductor synthesis has a regulatory effect on the exposed crystal plane of the material;The forbidden band widths of the three products are calculated by formula to be 3.14 eV,3.13 eV and 3.08 eV,respectively;The photo-generated electron-hole pairs of the three materials are superior to that of standerd materials.The photocatalytic performance test shows that after 6 hours of illumination,the ZnS/biological structured carbon photocatalytic composite with a concentration of 0.20 mol·L^-1prepared by calcination hydrothermal method has better hydrogen production,which is 551.13μmol.In addition,the material has a strong recyclability.