60results about How to "Efficient reduction" patented technology

The invention relates to an offshore photovoltaic module comprehensive performance test system, and aims to solve the problem that a traditional photovoltaic test system cannot accurately simulate an offshore complex environment, and the system comprises a test cavity which is provided with an air inlet; a photovoltaic support and a photovoltaic module arranged on the photovoltaic support; a sunlight simulation lamp; the photovoltaic module tester is electrically connected with the photovoltaic module; the refrigerating / heating module is used for inputting hot / cold air into the air inlet; the salt mist / acid mist / alkali mist nozzle module is arranged at the top of the test cavity; the salt liquid / acid liquid / alkali liquid configuration module is connected with the salt mist / acid mist / alkali mist nozzle module through a liquid conveying pipeline and exchanges heat with an air outlet of the refrigerating / heating module; a fan can be arranged at the air inlet, and a sun shield capable of adjusting the sun-shading coverage area is arranged on the photovoltaic support. Compared with the prior art, the device and the method have the advantages that complex environmental factors such as illumination, temperature, corrosion and shadow shielding on the sea can be comprehensively and accurately simulated, and an effective means is provided for performance test and evaluation of the photovoltaic module on the sea.

The invention relates to the technical field of enzyme engineering, in particular to a glucose dehydrogenase mutant and application thereof. The invention discloses a glucose dehydrogenase mutant. The glucose dehydrogenase mutant is selected from mutation of at least one amino acid of the 20th site, the 132th site, the 135th site, the 176th site and the 182th site of an amino acid sequence shown in SEQ ID NO.1. The invention further discloses a preparation method of the glucose dehydrogenase mutant. Compared with a conventional wild type glucose dehydrogenase mutant, the glucose dehydrogenase mutant provided by the invention has higher reductase activity on NMN, the enzyme activity of the glucose dehydrogenase mutant can reach 1220 times of that of the wild type, and the glucose dehydrogenase mutant can efficiently reduce NMN into NMNH; the glucose dehydrogenase mutant can be mechanically applied for more than 20 times after being immobilized, 800 mM of NMN can be completely transformed within 1 hour, and 1.2 M of NMN can be completely transformed within 1.5 hours.

The invention relates to the field of metallurgy, and provides an efficient titanium slag smelting method which comprises the following steps: controlling the total charging quantity of titanium concentrate in a single furnace according to the effective volume and rated power supply power of an electric furnace, blanking according to a fixed feeding speed, and calculating the total charging quantity of a reducing agent in the single furnace based on the total charging quantity of the titanium concentrate in the single furnace, blanking is carried out according to the feeding speed from high to low; the titanium concentrate and a reducing agent are conveyed into a smelting furnace to be subjected to continuous micro-negative-pressure smelting, first-time deslagging operation is carried out, a first part of titanium slag is obtained, and electrification is maintained; and when the total iron content of the first part of titanium slag is reduced to an expected value, electrifying is stopped, secondary slag tapping and iron tapping operation are carried out, and a second part of titanium slag and low-carbon molten iron are obtained. According to the method, on the premise that the unit furnace burden reducing agent adding amount and the unit power supply power are not changed, the furnace feeding system and the corresponding power supply power of the reducing agent are adjusted, so that the high-and-low carbon adding system and the low-and-low power supply system are formed, and the smelting efficiency in the titanium slag smelting process is effectively improved.

The method comprises the following steps: crushing the cyanidation tailings, putting the crushed cyanidation tailings, biomass material powder and an alkaline substance into a reaction kettle, adding water, heating to 200-350 DEG C, carrying out hydrothermal reaction treatment, and filtering after the hydrothermal reaction is finished, so as to obtain a sodium silicate solution and a solid filter; adding hydrochloric acid into the sodium silicate solution for pH regulation, then adding bone glue, heating, stirring, filtering and separating to obtain the sodium silicate solution and desiliconized tail liquid; and the solid filtered matter is subjected to gold element enrichment through a carbon leaching method, then solid-liquid separation is conducted, the solid obtained through separation is subjected to magnetic separation, and gold-loaded carbon and iron ore concentrate are obtained. According to the method, the waste biomass material is adopted as a reduction material of the cyanidation tailings, and a hydrothermal treatment mode is adopted in an alkaline environment, so that the process cost in the production process can be greatly reduced, no harmful substance is generated in the reduction process, and the environment can be effectively protected; and meanwhile, separation of valuable metals can be promoted.

The invention discloses a method for realizing precise green restoration of environmental heavy metal pollutants by coupling a heavy metal sensing module and an aerobic sulfate reduction module. The method comprises the following steps: constructing an aerobic sulfate reduction pathway by heterologous reconstruction of cysteine feedback inhibition-resistant serine acetyltransferase and cysteine desulfylase, putting the aerobic sulfate reduction pathway under the control of a sensing module composed of heavy metal sensing protein genes, so as to construct a'sensing integration 'module, and transferring the'sensing integration' module into environmental microorganisms. The heavy metal in-situ remediation engineering strain is formed. When a specific heavy metal sensing module in the engineering strain recognizes heavy metal pollution, expression of an aerobic sulfate reduction module can be effectively started, so that heavy metal ions are converted into stable metal sulfide, and in-situ green low-carbon remediation of environmental heavy metal pollutants is realized. The genetic method disclosed by the invention is simple and efficient, saves the cost, can realize accurate perception and accurate control of environmental heavy metal pollution, and has important environmental protection application value.

The present invention discloses a nitrogen-doped porous graphene and a preparation method and application thereof. The preparation method comprises the following steps: uniformly dispersing graphene oxide aerogel, a nitrogen-containing precursor and an activator in deionized water, followed by drying and high-temperature calcination to obtain nitrogen-doped porous graphene; wherein the nitrogen-containing precursor is selected from at least one of urea, melamine and ammonium hydroxide; and the activator is selected from at least one of KFeO4 and KOH. The present invention uses KOH and KFeO4 as activators, and urea, melamine and ammonium hydroxide as nitrogen sources to simply and efficiently prepare nitrogen-doped porous graphene. The obtained nitrogen-doped porous graphene has a large specific surface area, developed pores and a high nitrogen content. When applied to the catalytic reduction of aromatic nitro compounds, its catalytic activity is far superior to the catalysts reported in the literature, including metal catalysts and carbon-based metal-free catalysts. It can efficiently reduce aromatic nitro compounds in aqueous solution under mild conditions, and also has the advantages of low cost and environmental friendliness.

The invention discloses a method for improving metallization rate and dezincification rate of solid waste based on cascade distribution of coke oven gas, which comprises the following steps: mixing a binder and iron-containing and zinc-containing solid waste according to a ratio, and feeding the mixture into a powerful mixer to form a mixture; the mixture enters a ball press machine to obtain green balls containing zinc and iron, and the green balls enter a rotary hearth furnace after being preheated, dried and screened; the green pellets sequentially pass through a heating area, a first reduction area, a second reduction area, a third reduction area, a fourth reduction area and a fifth reduction area which are sequentially arranged in the rotary hearth furnace in the trolley direction to form metallized pellets; and discharging the metallized pellets to a cylindrical cooling machine through a spiral discharging machine, and introducing nitrogen into the cylindrical cooling machine to obtain a final product. The method has the advantage that the metallization ratio of the carbon-containing pellets of the rotary hearth furnace is increased on the premise that the dezincification rate of the zinc-containing and iron-containing solid waste is guaranteed.

The invention relates to the technical field of photocatalytic processes, in particular to a catalyst for preparing methanol through photocatalytic reduction of CO2 as well as a preparation method and application of the catalyst. The catalyst comprises a composite carrier and active sites dispersed on the surface or in pores of the composite carrier, the composite carrier is of a heterojunction composite structure formed by a hollow TiO2 sphere and MCN, the hollow TiO2 sphere comprises a shell layer and a spherical cavity structure located in the shell layer, the shell layer is formed by TiO2 nanoparticles, and the MCN has a mesoporous pore structure; a II-type or Z-type heterojunction interface is formed between the hollow TiO2 spheres and the MCN through physical contact and chemical action; the active sites comprise copper nano species, sulfur vacancy defects and amino groups; the copper nano species are copper nano particles or clusters, and the valence state of copper is 0 and / or + 1 valence amino is grafted on the surface of the composite carrier through an organic long chain. The catalyst provided by the invention can greatly improve the yield and selectivity of methanol prepared by photocatalytic reduction of carbon dioxide.

The invention discloses a platinum-rhodium alloy loaded titanium dioxide catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysis. The preparation method comprises the following steps: 1, preparing a precursor solution of Pt and a precursor solution of Rh; 2, mixing the Pt precursor solution and the Rh precursor solution, adding TiO2 into the Pt precursor solution and the Rh precursor solution, and carrying out solvothermal reaction to obtain a sample; and 3, washing the obtained sample, and carrying out vacuum drying. The TiO2-loaded platinum-rhodium alloy catalyst prepared by the invention can be used for efficiently carrying out photo-reduction on CO into C2H4, and the yield within 3 hours is up to 362.94 mu mol gcat <-1 >; the catalyst prepared by the invention has high activity and high selectivity which exceed most of currently reported CO photocatalytic reduction performance, and especially can produce C2H4, and the selectivity of C2H4 is close to 50%.