Preparation method of metal-nonmetal-codoped nano-titanium dioxide photocatalyst
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A technology of nano-titanium dioxide and photocatalyst, which is applied in the field of photocatalysis, can solve the problems of easy falling off, etc., and achieve the effect of firm combination, simple preparation process and low operating cost
Inactive Publication Date: 2013-01-09
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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However, it was found through experiments that supported TiO 2 TiO was simply absorbed by physical adsorption 2 Fixed on the surface of the carrier, easy to fall off during repeated use
Method used
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Embodiment 1
[0028] a. Take the concentration of 3.5mL as 9.11mol / L TiCl 4 Add 1g of modified polyacrylonitrile fiber dropwise to magnetically stirred 500mL distilled water, mix well, add 1g of modified polyacrylonitrile fiber, stir at room temperature for 1 hour, then heat to 55°C, keep for 7 hours, cool to room temperature, filter, and wash with distilled water until neutral. After drying to constant weight, a non-metallic nitrogen-doped modified nanometer titanium dioxide is obtained.
[0029] b. Take 0.05g of the nitrogen-doped modified nano-titanium dioxide prepared in step a and put it into 30mL 0.0050mol / L silver nitrate solution with pH=3.0, soak at room temperature for 50min, filter, wash with distilled water to neutrality, and dry To constant weight, namely Ag + , N co-doped modified nanometer titanium dioxide.
[0030] Its appearance is like figure 1 Shown.
Embodiment 2
[0032] The steps to divide b are:
[0033] Take 0.05g of the nitrogen-doped modified nano-titanium dioxide prepared in step a and put it in 30mL, 0.0050mol / L ferric chloride solution with pH=1.5, soak for 20min at room temperature, filter, wash with distilled water to neutrality, and dry To constant weight, Fe 3+ , N co-doped modified nanometer titanium dioxide.
[0034] The rest is the same as in Example 1.
Embodiment 3
[0036] The steps to divide b are:
[0037] Take 0.05g of the nitrogen-doped modified nano-titanium dioxide prepared in step a and put it into 30mL, 0.0015mol / L copper chloride solution with pH=5.0, soak for 20min at room temperature, filter, wash with distilled water to neutrality, and dry to constant Heavy, that is Cu 2+ , N co-doped modified nanometer titanium dioxide.
[0038] The rest is the same as in Example 1.
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Abstract
The invention discloses a preparation method of a metal-nonmetal-codoped nano-titanium dioxide photocatalyst. The method comprises the following steps of: a, adding modified polyacrylonitrile fibers to TiCl4 solution, standing for 0.1-2h, heating up to 30-80 DEG C, carrying out heat preservation for 1-10h, filtering, washing with distilled water until the solution is neutral, drying to constant weight, thereby obtaining nitrogen-doped modified nano-titanium dioxide; and b, feeding the prepared nitrogen-doped modified nano-titanium dioxide to a metal ion solution, impregnating for 0.1-2h, filtering, and drying to constant weight so as to obtain the product. Compared with the prior art, materials prepared by the method are rapid in dye wastewater degradation speed, free of secondary pollution, simple in preparation process, low in operation cost, firm in combination with fibers, unlikely to drop, easy to recover, and simple to recycle.
Description
Technical field: [0001] The invention belongs to the research field of photocatalysis technology and is mainly applied to the treatment of dye wastewater. It is a kind of preparation of novel, high-efficiency, metal and non-metal ion co-doped nano TiO 2 Photocatalyst method. Background technique: [0002] At present, in the field of environmental photocatalysis research, TiO 2 Semiconductors have become the most important photocatalysts for their excellent chemical resistance and photo-corrosion properties, and are increasingly favored by researchers. But the higher band gap makes TiO only excited by ultraviolet light. 2 Its photocatalytic activity limits its practical application. So for TiO 2 More and more scholars pay attention to modification to broaden its light response range and to develop new photocatalysts. [0003] And most of the TiO used in photocatalysis 2 Are all powdered TiO 2 , It is not easy to settle in the sedimentation tank during the water treatment applicatio...
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