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Method used for detecting alcohol concentration of baijiu based on WO3/FTO photoelectric material
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A photoelectric material and technology of alcohol content, applied in the field of liquor, to achieve the effect of enhancing visible light absorption rate, simple preparation method, and superior photoelectrochemical performance
Active Publication Date: 2018-06-01
JIMEI UNIV
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At present, there is still no information on the use of WO 3 A report on the construction of ethanol PEC sensor
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Embodiment 1
[0036] In the first step, the FTO glass was cut into 1.5cm×1.0cm (length×width), ultrasonically cleaned three times with acetone, ethanol and ultrapure water respectively, and dried with nitrogen gas for later use. Weigh 0.3g, 0.35g, 0.4g, 0.45g, 0.5g of sodiumtungstate into a 100mL beaker, add 30mL of ultrapure water with magnetic stirring to dissolve, and dissolve 10mL of HCl (3mol L -1 ) was slowly added dropwise to the above solution, and continued to stir until the solution produced a yellow precipitate. Then add 0.2 g of ammoniumoxalate, stir until the precipitate dissolves, add 30 mL of ultrapure water and stir for 30 min to obtain a clear solution. The FTO (1.5cm×1.0cm) was placed on the side wall of the 30mL reactor with the conductive side facing down, and the angle between the FTO and the side wall of the reactor was about 45°. Slowly add 15 mL of the above clear solution, cover the lid, and place the reaction kettle in a 120°C oven for hydrothermal reaction for ...
Embodiment 2
[0046] The first step, the addition of fixed sodium tungstate is 0.4g, other is the same as embodiment 1.
[0047] Second step, as embodiment 1.
[0048] The 3rd step, as embodiment 1.
[0049] The fourth step, with 100mW·cm -1 Xenon lamp as light source, using chronoamperometry, at 28°C, pH=3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 of 0.05mol L -1 In phosphate buffer, set the bias voltage to 1.0V, test ethanol in VAP-WO 3 / Photocurrent enhancement behavior on FTO electrodes.
[0050] The 5th step, as embodiment 1.
[0051] The 6th step, as embodiment 1.
Embodiment 3
[0053] The first step, such as example 2.
[0054] Second step, as embodiment 1.
[0055] The 3rd step, as embodiment 1.
[0056] The fourth step, with 100mW·cm -1 Xenon lamp as light source, using chronoamperometry, at 28°C, pH = 5.0 0.05mol L -1 In phosphate buffer, set the bias voltage to 0.8V, 0.9V, 1.0V, 1.1V, 1.2V, test ethanol in VAP-WO 3 / Photocurrent enhancement behavior on FTO electrodes.
[0057] The 5th step, as embodiment 1.
[0058] The 6th step, as embodiment 1.
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Abstract
The invention discloses a method used for detecting alcohol concentration of baijiu based on WO3 / FTO photoelectric material. The method comprises following steps: FTO glass is subjected to cutting, ultrapure water is added into sodiumtungstate for dissolving, HCl is added into an obtained dissolved solution, continuous stirring is carried out until a yellow precipitate is generated in the dissolved solution, ammoniumoxalate is added, and ultrapure water is added for stirring so as to obtain a settled solution; FTO is added into the settled solution for hydro-thermal reaction, WO3.nH2O / FTO iscollected, and is subjected to rinsing with ultrapure water so as to obtain VAP-WO3 / FTO; disodium hydrogen phosphate is mixed with a sodium dihydrogen phosphate solution so as to obtain a phosphoricbuffer, an alcoholaqueous solution is prepared, and is diluted with the phosphoric buffer so as to obtain a standard solution; a photoelectrochemistry measuring device is constructed; the phosphoricbuffer is provided with bias voltage, and alcoholphotocurrent enhancement behavior is measured; single electrode repeatable performance evaluation is carried out; commercial available baijiu is collected, and is diluted with the phosphoric buffer, and the photoelectric current of the diluted baijiu is measured; after dilution with the phosphoric buffer, alcohol is added to measure adding standardexperiment results.
Description
technical field [0001] The present invention relates to liquor, especially relates to a kind of based on WO 3 / FTO photoelectric material detects the method for the alcohol content in liquor. Background technique [0002] Baijiu is a kind of distilled liquor unique to our country. It is mainly obtained by making fermented grains from starch or sugary raw materials or distilled after fermentation. The main component of liquor is ethanol, which is often expressed by converting it into alcohol in the study of alcohol. Alcohol, also known as alcohol, refers to the volume percentage of ethanol in liquor at 20°C. In liquor production and sales, alcohol content is an important quality and technical index. The product standards of all kinds of liquor have clear requirements on the alcohol content, and stipulate that the error range between the product measurement results and the label value is within ±1.0 o within. Common detection methods for alcohol content include density bo...
Claims
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