The invention provides a strontium-doped LaVO3 nanowire and a preparation method of a gas sensor for the strontium-doped LaVO3 nanowire The preparation method mainly comprises the following steps: adding a strontium nitrate solution and a lanthanum nitrate solution into an ammonium metavanadate solution in sequence according to a certain volume ratio to obtain a mixed solution, and adjusting the pH value of the mixed solution to be 4-65 by using ammonia water; transferring the mixed solution to a hydrothermal kettle, reacting in an oven at 160 DEG C for 16 hours to obtain a product, and drying the product in a vacuum oven to obtain a strontium-doped LaVO4 precursor; performing heat treatment on the strontium-doped LaVO4 precursor in a tubular furnace in a hydrogen atmosphere at 650 DEG C for 2 hours, and performing furnace cooling to obtain the strontium-doped LaVO3 nanowire The obtained strontium-doped LaVO3 nanowire is very long and has a remarkable response on ammonia gas at the normal temperature; the resistance of the prepared gas sensor is slightly changed along with the temperature, so that the error caused by the temperature change is effectively avoided and the stability is good

Strontium-doped LaVO3 nanowire and preparation method of gas sensor for same

The invention relates to a detection method, in particular to a method for rapidly detecting traces of chloroform. The method includes the steps of firstly preparing gold nanoparticle hydrosol and then detecting traces of the chloroform through the gold nanoparticle hydrosol. The gold nanoparticle hydrosol is successfully prepared with oxyethylene steroid (BPS-30) as surfactant; the prepared gold nanoparticle hydrosol is used for detecting chloroform residue; qualitative analysis is conducted through visual observation or a UV (ultraviolet) spectrophotometer. With the gold nanoparticle hydrosol coated by the surfactant of sterols used, colloids are strong in stability and easy to carry. When the gold nanoparticle hydrosol meets the chloroform, the gold nanoparticle hydrosol immediately coagulates to make sol change from purple to light gray; within five minutes, the gold nanoparticle hydrosol completely coagulates, the sol is separated, and transparent aqueous solution is on the upper layer, while aggregation of black gold nanoparticles is on the lower layer. The said changes can be visually detected and determined. Furthermore, operation is simple, and efficiency is high.

Method for rapidly detecting traces of chloroform

The invention relates to a split type high volume automatic control regulable hydrogen production system. The split type high volume automatic control regulable hydrogen production system is characterized in that a water inlet non-return valve and a water outlet are arranged on a water storage tank; the water storage tank is successively communicated with a plurality of reaction vessels through awater-supply-pipe, and a water pump is arranged on a water-supply-pipe; a decompression valve and an electronic pressure gage; a hydrogen storage tank is successively communicated with the plurality of reaction vessels through a hydrogen transmission pipe, and a hydrogen output solenoid valve and a mass flow rate valve are arranged on the hydrogen transmission pipe; aluminium alloy powder are arranged in each reaction vessel, and each reaction vessel is provided with a reaction inlet and outlet control assembly; and the reaction inlet and outlet control assembly is successively connected withan OP liquid crystal operating system and a PLC control circuit. When the split type high volume automatic control regulable hydrogen production system is used, Start is clicked, and then the water pump pumps the water into the first reaction vessel to react with the aluminium alloy powder to generate hydrogen, and the generated hydrogen is transmitted to the hydrogen storage tank; when the pressure of the hydrogen rises to a constant value, the water pump automatically stops pumping water and the hydrogen in the hydrogen storage tank is maintained to use; Start-to-Use is clicked, and then thehydrogen can be taken and used; and after one reaction vessel is used completely, and then the next reaction vessel is automatically switched to. The split type high volume automatic control regulable hydrogen production system has the advantages of being large in the hydrogen storage capacity, being stationary and ordered in the reaction process, being able to take and use at any time, being simple in structure and being safe and stable.

Split type high volume automatic control regulable hydrogen production system

The invention relates to an aluminum alloy/hydroboron hydrolysis reaction-based miniature hydrogen production system and a hydrogen production method thereof, belonging to the field of hydrogen preparation technique. The aluminum alloy/hydroboron hydrolysis reaction-based miniature hydrogen production system comprises a hydrogen production generator and a liquid storage tank, wherein the hydrogen production generator is coated by the liquid storage tank; an outlet at the bottom end of the liquid storage tank is connected with a hydrogen production generator liquid delivery pipe, a liquid delivery control valve, a stainless steel pipe and a reaction region; the top end of the liquid delivery pipe is connected with a hydrogen storage chamber; the hydrogen production generator is divided into a reaction chamber and the hydrogen storage chamber by a separation film; and two symmetrical circular truncated cones are arranged at the bottom of the reaction region. The hydrogen production method of the aluminum alloy/hydroboron hydrolysis reaction-based miniature hydrogen production system is characterized in that the hydroboron solution input velocity of the liquid delivery control valve is regulated to realize the start/stop of the hydrolysis reaction of the hydrogen production system, so as to stabilize the hydrogen pressure of the hydrogen production system. The aluminum alloy/hydroboron hydrolysis reaction-based miniature hydrogen production system and the hydrogen production method have the characteristics of being simple in structure, and safe and reliable, and suitable for supplying hydrogen for portable fuel cells or internal combustion engines.

Aluminum alloy/hydroboron hydrolysis reaction-based miniature hydrogen production system and hydrogen production method

The invention discloses a preparing method for a cerium-doped tin-dioxide sensing material for detecting formaldehyde at the low temperature, and belongs to the technical field of gas sensing. A solvothermal method is adopted, water and ethyl alcohol serve as solvents, a tin source and a cerium source in a certain ratio serve as reactants, and the nanometer material which is in an octahedral shapewith the particle size of 20 nm and is good in dispersity is prepared and obtained at the certain reaction temperature. The invention further provides a preparing method for a cerium-doped tin-dioxide gas sensitive element. The optimal operation temperature for the gas sensitive element to detect formaldehyde gas is 100 DEG C, and the gas sensitive element has good sensitivity and a good responserecovery characteristic. The cerium-doped tin-dioxide sensing material is insensitive to different compounds including ethyl alcohol, acetone, ethyl acetate, methyl alcohol and isopropyl alcohol, andhas good selectivity. The preparing method of the gas sensitive material has the advantages of being low in cost, energy consumption and the like, and has high practical application value.

Preparing method for cerium-doped tin-dioxide sensing material for detecting formaldehyde at low temperature

The invention discloses a portable, safe and controllable hydrolysis hydrogen-producing device which includes a reactor for storing solid reaction materials, a water storage tank and pipelines, wherein a miniature pump for pumping water in the water storage tank into the reactor is arranged between the reactor and the water storage tank; a gas outlet for outputting hydrogen gas and a water inlet for inputting reaction water are arranged on the reactor; the gas outlet is communicated with a pressure sensor and a condensation drier; the pressure sensor and the miniature pump are electrically connected with a control circuit respectively; and a hydrogen gas output pipe is arranged on the condensation drier. The invention has benefits as follows: (1) the device has the advantages of controllable hydrogen-producing rate, short reaction time, high use ratio of the solid reaction materials and the like, and provides a hydrogen source for hydrogen fuel batteries and portable power supplies in various industries; and (2) the device has a simple structure, is simple and easy to control, can carry out controllable hydrogen production, causes no pollution, is low in cost, and is safe and reliable, thereby being suitable for providing a hydrogen source for hydrogen fuel batteries and portable power supplies in various industries.

Portable, safe and controllable hydrolysis hydrogen-producing device

Air-sensitive material with high-sensitivity and quick-response, and preparation method and application thereof

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Portable, safe and controllable hydrolysis hydrogen-producing device

Air-sensitive material with high-sensitivity and quick-response, and preparation method and application thereof