Silver-loaded nanometer titanium dioxide sol, preparation method and applications thereof
A nano-titanium dioxide, titanium dioxide technology, applied in the direction of botany equipment and methods, applications, chemicals for biological control, etc., can solve the problems of low concentration of titanium dioxide, poor stability, large particle size, etc.
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[0028] Example 1
[0029] (1) Preparation of titanium dioxide aqueous dispersion:
[0030] Convert 53.5g to solid TiO 2 15g of tetraisopropyl titanate was slowly added dropwise to 417g of 3.6wt% hydrogen peroxide aqueous solution. After stirring until the solid particles were completely dissolved, 30g of triethylamine was added dropwise to obtain 500g of yellow, clear and transparent titanium dioxide precursor solution . After that, 15g of commercially available silica sol containing 20wt% solid content (the average particle size of the silica contained in it is 10nm) was added to the 500g titanium dioxide precursor solution, and it was hydrothermally treated in an autoclave at 150°C for 5h to obtain Titanium dioxide aqueous dispersion.
[0031] (2) Washing and concentration:
[0032] The above-mentioned titanium dioxide aqueous dispersion was cooled to room temperature, washed with distilled water to neutrality and concentrated using an ultrafiltration device, to obtain 165 g of co...
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[0035] Example 2
[0036] (1) Preparation of titanium dioxide aqueous dispersion:
[0037] Convert 42.6g into solid TiO 2 10g of tetra-n-butyl titanate was slowly added dropwise to 956.4g of a 6.27wt% aqueous hydrogen peroxide solution, stirred until the solid particles were completely dissolved, and 1g of triethanolamine was added dropwise to obtain 1000g of yellow, clear and transparent titanium dioxide precursor solution . After that, 50g of commercially available silica sol containing 20wt% solid content (the average particle size of silica contained in it is 5nm) was added to the 1000g titania precursor solution, and it was hydrothermally treated in an autoclave at 120°C for 20h to obtain Titanium dioxide aqueous dispersion.
[0038] (2) Washing and concentration:
[0039] The above-mentioned titanium dioxide aqueous dispersion was cooled to room temperature, washed with distilled water to neutrality and concentrated using an ultrafiltration device, to obtain 1000 g of concentr...
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[0042] Example 3
[0043] (1) Preparation of titanium dioxide aqueous dispersion:
[0044] Convert 89.3g to solid TiO 2 25g of tetraisopropyl titanate was slowly added dropwise to 385.7g of 19.45wt% hydrogen peroxide aqueous solution. After stirring until the solid particles were completely dissolved, 25g of citric acid was added dropwise to obtain 500g of yellow, clear and transparent titanium dioxide precursor solution . Then, 125g of commercially available silica sol (the average particle size of the silica contained in it is 8nm) with a solid content of 20wt% was added to the 500g of the titanium dioxide precursor solution, and hydrothermally treated in an autoclave at 200°C for 10h to obtain Titanium dioxide aqueous dispersion.
[0045] (2) Washing and concentration
[0046] The above-mentioned titanium dioxide aqueous dispersion was cooled to room temperature, washed with distilled water to neutrality and concentrated using an ultrafiltration device, to obtain 250 g of concent...
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