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

The invention relates to a preparation method and a photocatalytic application of a polyacid-based cobalt metal-organic hybrid material, and also relates to the polyacid-based cobalt metal-organic hybrid material. The purpose of the present invention is to solve the problem of zero or low hydrogen yield of existing photocatalytic hydrogen production materials synthesized in the prior art, caused by wide forbidden bandwidth, easy photogenerated electron-hole recombination and difficult proton reduction surface reaction of the existing photocatalytic hydrogen production materials. The polyacid-based cobalt metal-organic hybrid material with a chemical formula (H2SiW12O40)[Co(pzta)3]2.4H2O is designed and developed in the invention. The synthesis method comprises the following steps: dissolving silicotungstic acid, cobalt chloride and an organic ligand 5-(2-pyrazinyl)-1,2,4-triazole in deionized water, adjusting the pH value of the obtained solution to 2.0, and carrying out a reaction ata temperature of 160 DEG C for 3 days to obtain the polyacid-based cobalt metal-organic hybrid material.

The invention discloses preparation and photocatalytic application of a polyacid-based cadmium metal hybrid material constructed by phosphomolybdic acid, and relates to a polyacid-based cadmium metal organic hybrid material constructed by phosphomolybdic acid. The invention aims to solve the problems that an existing photocatalytic hydrogen production material does not produce hydrogen or the hydrogen production amount is low and the like due to the fact that the energy gap of the photocatalytic hydrogen production material synthesized in the prior art is relatively wide, photo-induced electron holes are easy to compound, the surface reaction of proton reduction is relatively difficult and the like. The invention designs and develops a polyacid group cadmium metal organic hybrid material constructed by phosphomolybdate, the chemical formula of the polyacid group cadmium metal organic hybrid material constructed by phosphomolybdate is (PMo12O40)[Cd(C10H8N2)3], and C10H8N2 is 2,2-dipyridyl. The synthesis method comprises the following steps: dissolving phosphomolybdic acid, cadmium nitrate and an organic ligand (2,2-dipyridyl) into deionized water, adjusting the pH value to 1.5, and conducting reacting for 4 days at the temperature of 160 DEG C. According to the invention, the polyacid group cadmium metal organic hybrid material constructed by phosphomolybdate can be obtained.

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 provides a MoSe2-CdS / CdSe composite photocatalyst and a preparation method thereof. The preparation method includes the following steps that CdS nanorods are prepared by a hydrothermal method, selenium powder, sodium molybdate and cadmium sulfide are added at the same time, MoSe2 and CdSe are prepared on the CdS nanorods through an one-step hydrothermal method, and the MoSe2-CdS / CdSecomposite photocatalyst is prepared. According to the method, the preparation condition is very easy, raw materials are cheap, the 1T phase content in MoSe2 can be controlled by regulating the addition amount of hydrazine hydrate, and thus the phase content is regulated. The prepared photocatalyst has much higher photocatalytic activity than CdS under sunlight (AM1.5), the photocatalytic water splitting and hydrogen production performance is excellent, and the photocatalyst has great application potential in the field of new energy and environmental protection.

The invention discloses an ultrathin-structure carbon nitride-iron oxide photocatalyst and a preparation method of the carbon nitride-iron oxide photocatalyst; prepared carbon nitride and an iron salt solution are mixed, dried and put into a muffle furnace to be calcined, and the ultrathin-structure carbon nitride-iron oxide photocatalyst is obtained after calcination. The method is easy to operate and high in yield, the obtained photocatalyst can effectively catalyze water decomposition to produce hydrogen under visible light, and the method is an efficient and economical photocatalyst preparation method.

The invention belongs to the technical field of preparation of semiconductor materials, and particularly relates to a quantum dot-modified multi-shell CaTiO3 cube, and a preparation method and application thereof. According to the invention, calcium nitrate tetrahydrate, tetrabutyl titanate, sodium hydroxide, nickel nitrate hexahydrate and sodium hypophosphite are used as raw materials, and a simple hydrothermal method and a calcination method are combined to prepare the Ni2P / CaTiO3 heterojunction material with Z-type electron transport mechanism of the multi-shell CaTiO3 cube and Ni2P quantumdots. The Ni2P quantum dots are modified between shells and on the surface of the multi-shell CaTiO3 cube and used for improving abundance of active sites of channels between the shells so as to promote photocatalytic decomposition of water to produce hydrogen.

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 preparation and photocatalytic application of a polyacid-based manganese organic hybrid material constructed by silicotungstate, and relates to a polyacid-based manganese organic hybrid material constructed by silicotungstate. The invention aims to solve the problems that the forbidden band width of the photocatalytic hydrogen production material synthesized in the prior art is relatively wide, photo-induced electron holes are easy to compound, the surface reaction of proton reduction is relatively difficult and the like, so that the existing photocatalytic hydrogen production material does not produce hydrogen or the hydrogen production amount is relatively low. The invention designs and develops a polyacid-based manganese organic hybrid material constructed by silicotungstate. The chemical formula of the polyacid-based manganese organic hybrid material is (H2SiW12O40)[Mn(pzta)3]2.4H2O. The synthesis method comprises the following steps: dissolving silicotungstic acid, manganese chloride and an organic ligand 5-(2-pyrazinyl)-1,2,4-triazole into deionized water, adjusting the pH value to 2.0, and reacting for 3 days at 160 DEG C; according to the invention,the polyacid-based manganese organic hybrid material constructed by silicotungstate can be obtained.

The invention discloses preparation and application of a bismuth tungstate and carbon nitride composite photocatalytic material, relates to a bismuth tungstate and carbon nitride composite photocatalytic material, and aims to solve the problems that a photocatalytic hydrogen production material synthesized in the prior art is relatively wide in forbidden band width, easy to compound photo-induced electron holes and poor in light absorption capability, and thus the existing photocatalytic hydrogen production material is low in hydrogen production efficiency and the like in the prior art. The composite photocatalytic material formed by compounding bismuth tungstate and carbon nitride is designed and developed, and the chemical formula of the composite photocatalytic material is Na9 [BiW11O38] / g-C3N4 (BiW11 / g-C3N4 for short). The synthesis method comprises the following steps: stirring sodium tungstate dihydrate and bismuth nitrate at normal temperature to prepare polyacid Na9 [BiW11O38], and compounding the polyacid Na9 [BiW11O38] with g-C3N4 to prepare the BiW11 / g-C3N4 composite photocatalytic material. The semiconductor composite photocatalytic material obtained by the method is used for preparing hydrogen by photocatalytic decomposition of water at normal temperature and normal pressure.

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 discloses a silicon dioxide-filled nano-cluster composite material. The silicon dioxide-filled nano-cluster composite material comprises silicon dioxide and at least two types of inorganic nano-crystals, wherein one type is the inorganic nano-crystals with a surface plasma resonance effect, and the other type is the inorganic nano-crystals in overlapping absorption with the first type of the inorganic nano-crystals; the at least two types of the inorganic nano-crystals are assembled to obtain nano-clusters; the silicon dioxide is distributed in the whole nano-clusters to form the nano-cluster composite material; the particle size of the inorganic nano-crystals is 1-100nm; and the diameter of the nano-cluster composite material is 50-1000nm. The nano-cluster composite material has the advantages of simplicity, convenience, easiness in obtainment and adjustable size and composition, and further has important significance in actual application. The invention further discloses a method for preparing the silicon dioxide-filled nano-cluster composite material and application.

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.