40results about How to "Excellent photocatalytic water splitting hydrogen production performance" patented technology

A photocatalyst Pt-carried CdS / Ti-MCM-41 for generating H2 by optical catalytic reaction is prepared through providing CTAB as template agent, hydrothermal reaction to synthesize CTAB / Ti-MCM-41, ion exchange to obtain Cd / Ti-MCM-41, sulfurizing in HS gas to obtain CdS / Ti-MCM-41 and carrying Pt by optical reduction method. It has high H2 output rate.

The invention relates to a transition metal-modified pyridine nitrogen-based conjugated microporous polymer composite photocatalyst. Synthesis and ring amination reaction, and then the transition metal-modified pyridine nitrogen-based conjugated microporous polymer composite photocatalyst was prepared by vapor phase deposition, so that it has a good application in the photo-splitting of water for hydrogen production. The photocatalyst obtained by the invention has good photocatalytic hydrogen production performance and high hydrogen production rate; the invention adopts a vapor phase deposition method, and has simple process, simple equipment and simple operation.

The invention discloses a nanocluster photocatalyst using surface plasma resonance effect and electronic transmission synergistic effect. The nanocluster photocatalyst comprises at least three inorganic nanocrystals, wherein the first is the inorganic nanocrystal with surface plasma resonance effect, the second is the inorganic nanocrystal with overlapping absorption with the inorganic nanocrystal with surface plasma resonance effect, and the third is the inorganic nanocrystal with the electronic transmission effect; the at least three inorganic nanocrystals are assembled to obtain the nanocluster photocatalyst; the grain size of the inorganic nanocrystal is 1-100nm; the diameter of the nanocluster photocatalyst is 50-1000nm. The nanocluster photocatalyst has the features of being simple, efficient, adjustable in size and components, and has important significance in actual application. The invention further discloses a preparation method and application of the nanocluster photocatalyst.

The invention provides a ternary core-shell composite photocatalyst and preparation method thereof. The photocatalyst comprises outer wide-gap semiconductor oxides and inner n-type and p-type narrow bandgap semiconductor oxides. The ratio of them is as follows: the mass ratio of the outer wide-gap semiconductor oxides and the inner n-type and p-type narrow bandgap semiconductor oxides binary assembly is 0.01-0.9:1, the mol ratio of the outer wide-gap semiconductor oxides and the inner n-type and p-type narrow bandgap semiconductor oxides is 0.2-5.0:1. The photocatalyst is used in photocatalysis decomposition water for hydrogen production reaction or photocatalysis dye waste water degradation reaction. The ternary core-shell composite photocatalyst in the invention can resist photochemicalcorrosion, and has good photocatalysis decomposition water for hydrogen production performance and good photocatalysis dye waste water degradation performance.

The invention discloses a nanocluster efficiently utilizing the surface plasma resonance effect. The nanocluster comprises at least two types inorganic nanocrystalline, one of the two types inorganic nanocrystalline is inorganic nanocrystalline having the surface plasma resonance effect, the other of the two types inorganic nanocrystalline is inorganic nanocrystalline having an overlapping absorption function, and at least two types inorganic nanocrystalline are assembled to form the nanocluster. The particle size of the inorganic nanocrystalline ranges from 1 nm to 100 nm. The diameter of the nanocluster ranges from 50 nm to 1000 nm. The nanocluster has the advantages of being simple, convenient and easy to obtain and adjustable in size and composition and has important significance in actual application. The invention further discloses a preparation method and application of the nanocluster.

The invention is applicable to the technical field of photocatalysis, and provides a method for preparing nickel and nickel carbide modified cadmium sulfide nanowires, which comprises: cadmium chloride and sodium diethyldithiocarbamate trihydrate dissolved in water respectively. The two solutions were mixed, stirred, centrifuged and dried. The dried solid is dissolved in ethylenediamine and then hydrothermally reacted to generate cadmium sulfide. Dissolve cadmium sulfide, nickel nitrate, and hexamethylenetetramine in water. Transfer to a reaction kettle, centrifuge the product, and dry it. Calcined in a tube furnace to obtain nickel and nickel carbide modified cadmium sulfide. The linear cadmium sulfide obtained by the present invention has good dispersion and stable structure; the modified cadmium sulfide obtained by the method of the present invention has a hydrogen production capacity of 15000 μmolg ‑1 h ‑1 , and continued to react for 15 hours, still able to maintain good hydrogen production performance. It can also effectively degrade oxytetracycline (OTC), levofloxacin (LEV), tetracycline hydrochloride (TCH), norfloxacin (NFX), and other antibiotics and dye reactive red 2 (RR2), within 90 minutes, the degradation performance reaches 78 %~91%.

The invention relates to a TiO2 photocatalyst and in particular relates to a CdS-MoS2 nanoparticle co-doped black porous TiO2 photocatalyst and a preparation method thereof and a performance study by producing hydrogen by water photolysis, and belongs to the field of semiconductor materials. The catalyst is prepared by the steps: firstly, synthesizing porous MoO3-CdO-TiO2; hydrogenating the porous MoO3-CdO-TiO2 under the supporting action of ethidene diamine to obtain black MoO3-CdO-TiO2; and then performing in-situ vulcanization in a solvothermal condition to obtain black MoS2-CdS-TiO2. As CdS can absorb visible light, MoS2 can effectively transfer photon-generated carriers and black TiO2 can effectively enhance the photon-to-electron conversion efficiency, the catalyst shows an excellent performance of producing hydrogen by photo-catalytic decomposition of water. The speed of producing hydrogen by water photolysis reaches 4527 umol.h<-1>g<-1>. Therefore, a novel path for preparing a novel photocatalyst under visible lights can be provided.

The preparation and photocatalytic application of a polyacid-based cobalt-metal organic hybrid material, the invention relates to a polyacid-based cobalt-metal organic hybrid material. The purpose of the present invention is to solve the problem that the photocatalytic hydrogen production material synthesized in the prior art has a wide band gap, the photogenerated electron holes are easy to recombine, and the surface reaction of proton reduction is difficult, etc., resulting in that the existing photocatalytic hydrogen production material does not produce problems such as hydrogen or low hydrogen production. This patent designs and develops a kind of polyacid-based cobalt metal-organic hybrid material whose chemical formula is (H 2 SiW 12 o 40 )[Co(pzta) 3 ] 2 4H 2 O. Synthesis method: Dissolve silicotungstic acid, cobalt chloride, and organic ligand 5‑(2‑pyrazinyl)‑1,2,4‑triazole in deionized water, adjust the pH to 2.0, and keep the temperature at 160°C Response 3 days. The invention can obtain a polyacid-based cobalt metal-organic hybrid material.

The invention discloses a method for preparing a defect-enhanced tungsten-doped carbon nitride photocatalyst, which belongs to the technical field of photocatalytic materials. The method comprises the following steps: mixing melamine and ammonium metatungstate in liquid phase, rotary evaporating and drying to remove deionized water; calcining the dried product in a muffle furnace, and naturally cooling to room temperature to obtain a tungsten-doped carbon nitride material; The obtained product is calcined at 520° C. for 30-90 min under hydrogen gas, more defects are introduced into the tungsten-doped carbon nitride photocatalyst, and a defect-enhanced tungsten-doped carbon nitride photocatalyst is obtained. A defect-enhanced tungsten-doped carbon nitride photocatalyst provided by the invention has good photocatalytic hydrogen production from water; the defect-enhanced carbon nitride prepared by the method of the invention has high carrier separation efficiency, which is beneficial to The photocatalytic activity is improved.