The Preparation And Sensitive Properties Of Nano Materials For Rapid Detection Of Acetone Based On Catalytic Luminescence

As one of the common volatile organic compounds,acetone has the characteristics of high volatility,flammability,and explosiveness,and is widely used as an organic solvent in industry or laboratories.On the other hand,acetone is also a respiratory biomarker for type 1 and type 2 diabetes,and is used as one of the indicators to measure human health in the field of biomedicine.Current methods for detecting acetone mostly rely on large-scale instruments,such as gas chromatography,and pre-experiments are required during the detection,which has the disadvantages of cumbersome operation,long detection time,and high price.The gas sensor can be miniaturized,but its stability and anti-interference performance need to be improved.After working for a period of time,the gas of the object to be tested may react chemically with the sensitive material on the sensor,thereby attaching to the sensor surface to make its detection performance Get worse.Therefore,it is necessary to explore new detection methods to achieve fast and highly sensitive detection of acetone gas.In recent years,due to the characteristics of high sensitivity,fast detection speed,good stability,and small device size,the nanomaterial catalytic luminescence method has attracted more and more attention from scientific researchers in the field of volatile organic compounds?VOCs?detection.Catalytic luminescence sensors have become a hot research topic today.In this paper,common metal salts are used as raw materials,and single metal oxide and composite metal oxide nano-sensitive materials are synthesized through a simple preparation process.Three types of acetone detection sensors based on catalytic luminescence methods are designed and their catalytic luminescence performance is systematically studied Research content includes:?1?The needle-like clusters of iron oxyhydroxide nanomaterials were synthesized by co-precipitation method.The study found that under certain conditions,it has a good catalytic luminescence response signal to acetone gas.Based on this phenomenon,a catalytic luminescence sensor for detecting acetone was designed.In order to explore the sensitive characteristics of the sensor for acetone detection,experiments were conducted on the effects of gas concentration,reaction temperature and carrier gas flow rate.The research results show that the sensor has the best detection performance at a reaction temperature of 225?and a carrier gas flow rate of 250 mL/min.Excellent;the linear equation of CTL signal and concentration is:y=226.68x-2476.41.At the same time,this sensor has the characteristics of high sensitivity,good stability,fast response speed,short recovery time,etc.Its response time is 2-3s,recovery time is8-10s,and the relative error of the signal strength repeatedly detected under the same conditions Can be maintained at about 2%.In addition,under the interference of many common volatile organic compounds,such as methyl ethyl ketone,methanol,chloroform,ammonia,ethanol,formaldehyde,acetonitrile,butanol,chlorobenzene and toluene,this sensor still has a good response to acetone,indicating that The sensor has good selectivity.?2?The composite material of polyethylene glycol 1500?PEG1500?and magnesium oxide with flower-like structure was synthesized by simple hydrothermal method.Through preliminary optimization of the preparation scheme,different PEG1500/MgO composite nanomaterials with a mass ratio of about 1:2.03 and 0.1:2.03 were designed and synthesized.The preliminary results of the material performance showed that the PEG1500/MgO composite nanometer with a mass ratio of 0.1:2.03 The material has the best response to catalytic luminescence.Based on this composite material,a new type of catalytic luminescence sensor was developed.The sensor has a strong response signal to acetone gas,and the response time is 1²s,the recovery time is about 15s,and the relative error can be kept below 5%.At the same time,within the detection range of the sensor,the CTL signal intensity has a clear linear relationship with the concentration,and its linear equation is:y=1936.73x-4642.08.In order to explore the best detection conditions,firstly study from five different temperature gradients within the range of 160²40?,and choose 220?as the best reaction temperature by comparing the change law of CTL signal intensity and signal-to-noise ratio In the range of 200⁴00mL/min,the above two evaluation factors are also compared,and finally 350mL/min is selected as the optimal carrier gas flow rate.The lower detection limit of this kind of sensor is lower,and there is still a clear response signal under the condition of a gas concentration of 35mg/L.In addition,it was also found that under the interference of many common volatile organic compounds,such as ethyl acetate,methanol,chloroform,etc.,this sensor still has good selectivity to acetone.?3?Used FeCl₃·6H₂O and Mg?CH₃COO?₂·4H₂O as raw materials,iron-magnesium composite nanomaterials with different morphologies and structures were prepared in molar ratios of 1:1,1:5,and 1:10,respectively.The research found that the detection signal based on the bulk polyhedral iron-magnesium composite nanomaterials with a molar ratio of 1:10 was the strongest,And make it into a catalytic luminescence sensor for the detection of acetone gas.Through the best performance exploration experiment,this sensor has the best detection effect under the conditions of reaction temperature230?and carrier gas flow rate 300mL/min,the strongest signal,and the response time is 1²s,the recovery time is about 15s The relative error can be maintained at about3%,with high sensitivity and stability.In addition,the CTL signal of the sensor in the range of 70⁷00mg/L has a good linear relationship with the concentration of the analyte,and its linear equation is y=514.567x-3507.92.The results of the selectivity study indicate that a variety of interfering volatile analytes such as xylene,triethylamine,chlorobenzene,etc.are passed into the reaction chamber,and the sensor still only responds well to acetone,it showed that the sensor had good selectivity.Figure[25]Table[4]Reference[76]...