SiO2@MIL-88A core-shell material for degrading organic printing and dyeing waste and preparation process of SiO2@MIL-88A core-shell material
A core-shell and waste technology, applied in the fields of material engineering and photocatalytic degradation, to achieve the effects of high catalytic activity, mild preparation conditions and large specific surface area
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Embodiment 1
[0103] a. Take 50mL n-propanol, 15.2mL H 2 O, 4.75mL of ammonia water was added to the reaction flask in turn, cooled, stirred at 450rpm, 13mL of tetraethyl silicate in propanol (0.23mL / L) was added dropwise, and reacted for 30min to obtain silicon ball seed solution.
[0104] b. Take 5mL of the above-mentioned seed liquid mixed by ultrasonic, 25mL of propanol, 5.7mL of H 2 0. Add 4mL ammonia water to a 250mL eggplant-shaped flask successively (keep the stirring speed at 450rpm). Continue to add 16mL of ammonia water at 25°C, use a syringe pump, add 59mL of 0.23mol / L tetraethyl silicate / propanol solution at 30mL / h, after the addition is complete (about 2h), slowly reduce the speed to 350rpm, and stir overnight ( 8h or more). Suction filtration to obtain silica spheres, which were washed with water and ethanol in turn, and then vacuum-dried at 55°C for 12 hours for use.
[0105] c, take 500mg of the above SiO 2 The spheres were dispersed in 50mL of ethanol, and refluxed at ...
Embodiment 2
[0108] a, take 50mL n-propanol, 15mL H 2 0, 5mL of ammonia water were sequentially added to the reaction flask, the temperature was lowered, stirred at 520rpm, 15mL of tetraethyl silicate in propanol (0.23mL / L) was added dropwise, and reacted for 40min to obtain silicon ball seed solution.
[0109] b. Take 5mL of the above seed liquid mixed by ultrasonic, 25mL of propanol, 6mL of H 2 0. Add 4.5mL ammonia water to a 250mL eggplant-shaped flask in turn (keep the stirring speed at 450rpm). Continue to add 18mL of ammonia water at 25°C, use a syringe pump, add 60mL of 0.22mol / L tetraethyl silicate / propanol solution at 28mL / h, after the addition is complete (about 2h), slowly reduce the speed to 3300rpm, and stir overnight ( 8h or more). Suction filtration to obtain silica spheres, which were washed with water and ethanol in turn, and then vacuum-dried at 60°C for 12 hours for use.
[0110] c, take 550mg of the above SiO 2 The spheres were dispersed in 50mL of ethanol and reflu...
Embodiment 3
[0113] First, accurately weigh 50.0 mg of acid red (AR-18) into a 50.0 mL volumetric flask, add deionized water to volume, and prepare a 1.0 mg / mL dye solution. The test system is 1.0mL of dye solution, 1.03mL of 30% hydrogen peroxide, 50.0mL of deionized water (at this time, the concentration of dye is about 20mg / L, and the concentration of hydrogen peroxide is about 10mmol / L), after adding 20mg of SiO 2 @MIL-88A core-shell catalyst, stirred under sunlight, and started timing, took about 2mL of samples every 10 minutes, and measured its UV-Vis absorption spectrum. It can be seen that the UV absorption spectrum intensity of AR-18 gradually weakens with time ( Figure 4 ), the reaction solution turns from red to colorless, and its degradation rate (R) reaches 85% in 20min after calculation ( Figure 9 ).
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