Method for detecting formaldehyde by quartz crystal microbalance sensor
A technology of quartz crystal and microbalance, applied in the direction of material absorption and weighing, can solve the problems of low detection sensitivity, long measurement time, poor selectivity, etc., and achieve the effect of high specific surface area, good use selectivity and good stability
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Embodiment 1
[0019] At room temperature at 25°C, in a stirred tank, 0.5g of cellulose acetate (polymerization degree 100) was stirred and dissolved in 9.5g of acetone at a rotating speed of 50rpm to obtain a 5% cellulose acetate solution; at room temperature at 25°C, Under the condition of a humidity of 40%, the cellulose acetate solution was input to the spinneret at a flow rate of 0.2mL / h, and at the same time, the spinneret was connected to a 10kV power supply for electrospinning to prepare cellulose acetate fibers; the spun fibers were deposited On the electrode of the quartz crystal microbalance, the distance between the receiving electrode and the spinneret is 5cm; the quartz crystal microbalance electrode deposited with fibers is immersed in a sodium alginate aqueous solution with a concentration of 0.01mg / ml, and the adsorption is balanced for 5 minutes , washed with distilled water for 5 minutes, and air-dried; the dried material was immersed in a polyethyleneimine aqueous solution...
Embodiment 2
[0021] At room temperature of 25°C, in a stirred tank, 1 g of polystyrene (polymerization degree 200) was stirred and dissolved in 13.3 g of tetrahydrofuran and N, N-dimethylacetamide mixed solvent (weight ratio 1:3) at 200 rpm. In the process, a polystyrene solution with a mass fraction of 7% was obtained; under the conditions of room temperature 25°C and humidity 45%, the polystyrene solution was input to the spinneret at a flow rate of 0.4mL / h, and the spinneret Connect a 15kV power supply for electrospinning to prepare polystyrene fibers; deposit the spun fibers on the electrodes of the quartz crystal microbalance, and the distance between the receiving electrode and the spinneret is 8cm; place the deposited fibers on the quartz crystal microbalance The electrode is immersed in an aqueous solution of sodium polystyrene sulfonate with a concentration of 1 mg / ml, and the adsorption equilibrium is 10 minutes, washed with distilled water for 7 minutes, and air-dried; the dried ...
Embodiment 3
[0023] At room temperature of 25°C, 1.5g of cellulose (polymerization degree 300) was stirred and dissolved in 15.2g of 7wt% NaOH / 12wt% urea aqueous solution in a stirred tank at a speed of 300rpm. After precooling to -12°C, the cellulose was rapidly dissolved to obtain the mass fraction It is a 9% cellulose solution; under the conditions of room temperature 25°C and humidity 45%, the cellulose solution is input to the spinneret at a flow rate of 0.5mL / h, and the spinneret is connected to a 15kV power supply for electrospinning Prepare cellulose fibers; deposit the spun fibers on the electrodes of the quartz crystal microbalance, the distance between the receiving electrode and the spinneret is 10cm; immerse the quartz crystal microbalance electrodes deposited with the fibers into a concentration of 2mg / ml Dextran sulfate aqueous solution, adsorption equilibrium for 15 minutes, washed with distilled water for 9 minutes, and air-dried; the dried material was immersed in a polyac...
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