Carbon nitrogen co-doped nano titanium dioxide-polyvinyl alcohol composite film with visible-light activity and preparation method and application thereof
A nano-titanium dioxide, polyvinyl alcohol technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, special compound water treatment, etc. The effect of small forbidden band width and simple and easy preparation process
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Embodiment 1
[0035] A method for preparing a carbon-nitrogen co-doped nano-titanium dioxide-polyvinyl alcohol composite film with visible light activity, comprising the following steps:
[0036]1) After uniformly mixing Tween 80, isopropyl titanate, concentrated nitric acid and isopropanol according to the mass ratio of 6:1:1:12, let it stand and age at room temperature for 2 days, and then put the aged The mixed solution is dried to remove the solvent to obtain a xerogel;
[0037] 2) The xerogel obtained in step 1) was calcined and activated at 420°C for 1 hour, then cooled naturally to room temperature, and the calcined and activated product was washed with water and ethanol in sequence, dried, and then ground into uniform nano-sized particles. Carbon and nitrogen co-doped nano-titanium dioxide powder (marked as CN-Ti 2 O);
[0038] 3) Add the carbon-nitrogen co-doped nano-titanium dioxide powder obtained in step 2) into water, ultrasonically disperse to form a uniform suspension with ...
Embodiment 2
[0049] A method for preparing a carbon-nitrogen co-doped nano-titanium dioxide-polyvinyl alcohol composite film with visible light activity, comprising the following steps:
[0050] 1) After uniformly mixing Tween 60, isopropyl titanate, concentrated nitric acid and isopropanol according to the mass ratio of 4.5:1:0.1:5.5, let it stand and age at room temperature for 1 day, and then the aged The mixed solution is dried to remove the solvent to obtain a xerogel;
[0051] 2) The dry gel obtained in step 1) was calcined and activated at 390°C for 5 hours, then cooled naturally to room temperature, and the calcined and activated product was washed with water and ethanol in sequence, dried, and then ground into uniform nano-sized particles. Carbon-nitrogen co-doped nano-titanium dioxide powder is obtained;
[0052] 3) Add the carbon-nitrogen co-doped nano-titanium dioxide powder obtained in step 2) into water, ultrasonically disperse to form a uniform suspension with a concentrati...
Embodiment 3
[0055] A method for preparing a carbon-nitrogen co-doped nano-titanium dioxide-polyvinyl alcohol composite film with visible light activity, comprising the following steps:
[0056] 1) After uniformly mixing Tween 40, isopropyl titanate, concentrated nitric acid and isopropanol according to the mass ratio of 0.6:1:0.1:3.8, let it stand and age at room temperature for 3 days, and then the aged The mixed solution is dried to remove the solvent to obtain a xerogel;
[0057] 2) The xerogel obtained in step 1) was calcined and activated at 400°C for 0.5 hours, then naturally cooled to room temperature, the calcined and activated product was washed with water and ethanol in sequence, dried, and then ground into uniform nano-sized particles, Carbon-nitrogen co-doped nano-titanium dioxide powder is obtained;
[0058] 3) Add the carbon-nitrogen co-doped nano-titanium dioxide powder obtained in step 2) into water, ultrasonically disperse to form a uniform suspension with a concentratio...
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