Fresh air purifying photocatalysis technology for fresh air system

Technical Field

The invention belongs to the field of fresh air equipment, specifically, in particular to a kind of clean fresh air system photocatalysis technology purifying fresh air.

Background Art

Currently, China a large number of civilian construction more room in relying on natural ventilation is ventilation. However, in recent years, because of motor vehicle exhaust emissions, industrial emission, the construction and other factors caused by urban building space gas of high-concentration contamination, especially fog haze day, natural the role of ventilation is no longer dilute indoor air pollution, but deteriorate the quality of the indoor air. Part of the building using the fresh air system, although fresh air system has better bactericidal and the function of filtering particulate matter, but not so as to remove the suction of the outdoor air contains volatile organic compounds (VOCs), is unable to achieve satisfactory air purifying effect.

Content of the invention

The invention solves the technical problem of providing a fresh air system for removing the suction of fresh air containing volatile organic compounds (VOCs) in the photocatalyst: adopts simple, green hydrothermal synthesis method for preparing mesoporous structure, the high-efficient photocatalytic performance TiO₂ photocatalyst.

Hydrothermal synthesis preparation method is as follows : (1) a certain amount of the titanium is mellow salt is dissolved in a water-free ethanol, magnetic stirring to make it dissolve completely, preparation solution A ; (2) the mass percentage content is 15-35% template agent and quality percentage content is 10% - 25% of a chelating agent (mass percentage content to a substance accounted for, titanium alkoxide the quality of raw material percentage content calculation) is dissolved in deionized water, magnetic stirring to make it dissolve completely, preparation solution B ; (3) the and A B solution mixing, stirring, to prepare suspension ; (4) into the suspension crystallization with inner liner of polytetrafluoroethylene Teflon in the reactor, in 150-220 °C reaction under the conditions of 6-24h ; (5) after the end of reaction, the reactor is cooled to the room temperature, the reaction product precipitated out of the centrifugal separation, with deionized water and anhydrous ethanol cleaning 5-10 time, filtering, the obtained sample in 100-120 °C drying in the oven 12-24h, to obtain powder body, the rate of rise of temperature control in 1-5° C/min, heating to 450-650 °C lu the temperature of the roast motor 3-5h, with mesoporous structure obtained TiO₂ photocatalyst, grinding, pressing, and grind siebtechnik, shall be 20-40 mesh particles, and formaldehyde gas reactive to evaluate photocatalytic degradation.

The titanium alkoxide is adopted as tetrabutyl titanate, isopropyl titanate in ethyl titanate or a; template agent is cetyl trimethyl ammonium bromide (CTAB), sodium dodecyl benzene sulfonate (LAS) or ethylene diamine tetraacetic acid (EDTA) in a; chelating agent is citric acid, sodium citrate, tartaric acid or malic acid in one kind or two kinds of.

Mode of execution

Embodiment 1:

Weighing 14.6g tetrabutyl titanate dissolved in 100 ml anhydrous ethanol to, magnetic stirring to make it dissolve completely, will 2.2g cetyl trimethyl ammonium bromide and 1.5g citric acid is dissolved in 50 ml deionized water, mix two kinds of solution to form suspension; into the suspension crystallization with inner liner of polytetrafluoroethylene Teflon in the reactor, in 150 °C reaction under the conditions of 8h, after the end of reaction, the reactor is cooled to the room temperature, the reaction product precipitated out of the centrifugal separation, with deionized water and anhydrous ethanol cleaning 6 times, filtering, the obtained sample in the 110 °C drying in the oven 12h, to obtain powder body, in the 450 °C lu the temperature of the roast motor 3h, the rate of rise of 1 °C/min, with mesoporous structure obtained TiO₂ photocatalyst, grinding, pressing, and grind siebtechnik, shall be 20-40 mesh particles, evaluation of photocatalytic reactivity to formaldehyde, the removal rate of formaldehyde measured 90.5%.

Embodiment 2:

Weighing 11.1g ethylene titanate the ester dissolves in 100 ml to anhydrous ethanol, magnetic stirring to make it dissolve completely, will 3.9g dodecyl benzene sulfonate and 2.8g tartaric acid dissolved in 50 ml deionized water, mix two kinds of solution to form suspension; into the suspension crystallization with inner liner of polytetrafluoroethylene Teflon in the reactor, in the 200 °C reaction under the conditions of 12h, after the end of reaction, the reactor is cooled to the room temperature, the reaction product precipitated out of the centrifugal separation, with deionized water and anhydrous ethanol cleaning 8 times, filtering, the obtained sample in the 110 °C drying in the oven 12h, to obtain powder body, in the 500 °C lu the temperature of the roast motor 3h, the heating rate is 3 °C/min, with mesoporous structure obtained TiO₂ photocatalyst, grinding, pressing, and grind siebtechnik, shall be 20-40 mesh particles, evaluation of photocatalytic reactivity to formaldehyde, the removal rate of formaldehyde measured 85.3%.

Embodiment 3:

Weighing 18.9g isopropyl titanate dissolved in 100 ml anhydrous ethanol to, magnetic stirring to make it dissolve completely, will 4.7g ethylene diamine tetraacetic acid and 2.8g malic acid is dissolved in 50 ml deionized water, mix two kinds of solution to form suspension; into the suspension crystallization with inner liner of polytetrafluoroethylene Teflon in the reactor, in 180 °C reaction under the conditions of 12h, after the end of reaction, the reactor is cooled to the room temperature, the reaction product precipitated out of the centrifugal separation, with deionized water and anhydrous ethanol cleaning 6 times, filtering, the sample obtained 120 °C drying in the oven 18h, to obtain powder body, in the 550 °C lu the temperature of the roast motor 3h, the rate of rise of 5 °C/min, with mesoporous structure obtained TiO₂ photocatalyst, grinding, pressing, and grind siebtechnik, shall be 20-40 mesh particles, evaluation of photocatalytic reactivity to formaldehyde, the removal rate of formaldehyde measured 89.6%.

Embodiment 4:

Weighing 14.6g tetrabutyl titanate dissolved in 100 ml anhydrous ethanol to, magnetic stirring to make it dissolve completely, will 2.9g ethylene diamine tetraacetic acid and 2.2g citric acid is dissolved in 50 ml deionized water, mix two kinds of solution to form suspension; into the suspension crystallization with inner liner of polytetrafluoroethylene Teflon in the reactor, in the 160 °C reaction under the conditions of 6h, after the end of reaction, the reactor is cooled to the room temperature, the reaction product precipitated out of the centrifugal separation, with deionized water and anhydrous ethanol cleaning 6 times, filtering, the obtained sample in the 110 °C drying in the oven 12h, to obtain powder body, in the 450 °C lu the temperature of the roast motor 3h, the rate of rise of 1 °C/min, with mesoporous structure obtained TiO₂ photocatalyst, grinding, pressing, and grind siebtechnik, shall be 20-40 mesh particles, evaluation of photocatalytic reactivity to formaldehyde, formaldehyde removal rate measured for 93.7%.

Embodiment 5:

Weighing 11.1g ethylene titanate the ester dissolves in 100 ml to anhydrous ethanol, magnetic stirring to make it dissolve completely, will 3.9g cetyl trimethyl ammonium bromide, 1.5g citric acid and 1.3g sodium citrate are dissolved in 50 ml deionized water, mix two kinds of solution to form suspension; into the suspension crystallization with inner liner of polytetrafluoroethylene Teflon in the reactor, in 220 °C reaction under the conditions of 24h, after the end of reaction, the reactor is cooled to the room temperature, the reaction product precipitated out of the centrifugal separation, with deionized water and anhydrous ethanol cleaning 10 times, filtering, the sample obtained 120 °C drying in the oven 24h, to obtain powder body, in the 500 °C lu the temperature of the roast motor 3h, the rate of rise of 1 °C/min, with mesoporous structure obtained TiO₂ photocatalyst, grinding, pressing, and grind siebtechnik, shall be 20-40 mesh particles, evaluation of photocatalytic reactivity to formaldehyde, the removal rate of formaldehyde measured 96.3%.

Embodiment 6:

Weighing 18.9g isopropyl titanate dissolved in 100 ml anhydrous ethanol to, magnetic stirring to make it dissolve completely, will 4.8g cetyl trimethyl ammonium bromide, 2.5g citric acid and 2.3g sodium citrate are dissolved in 50 ml deionized water, mix two kinds of solution to form suspension; into the suspension crystallization with inner liner of polytetrafluoroethylene Teflon in the reactor, in the 200 °C reaction under the conditions of 12h, after the end of reaction, the reactor is cooled to the room temperature, the reaction product precipitated out of the centrifugal separation, with deionized water and anhydrous ethanol cleaning 6 times, filtering, the obtained sample in the 110 °C drying in the oven 10h, to obtain powder body, in the 550 °C lu the temperature of the roast motor 3h, the heating rate is 4 °C/min, with mesoporous structure obtained TiO₂ photocatalyst, grinding, pressing, and grind siebtechnik, shall be 20-40 mesh particles, evaluation of photocatalytic reactivity to formaldehyde, the removal rate of formaldehyde measured 91.6%.