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A preparation method of sludge-loaded tio2 visible light photocatalytic material
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A photocatalytic material and visible light technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of complex steps and high cost, and achieve the goal of reducing recombination rate, improving performance and being easy to promote Effect
Inactive Publication Date: 2016-05-18
TONGJI UNIV
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[0005] At present, TiO is prepared by loading, doping and modification. 2 There are many methods for photocatalytic materials, and TiO prepared by most methods 2 Photocatalytic materials have specific structures and properties, which are different from sludge-supported TiO 2 Visible light photocatalytic materials, in addition, most methods have disadvantages such as high cost or complicated steps
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Embodiment 1
[0028] Preparation of dewatered sludge loaded with TiO 2 Visible light photocatalyst: 10g dewatered sludge, 5g TiOSO 4 ·2H 2O and 5ml of HCl were added to 30ml of distilled water, magnetically stirred at room temperature for 3-10h, and then centrifuged. The resulting suspension was transferred to a 100ml autoclave, and the autoclave was placed in an oven at 150°C for 12h. After cooling to room temperature, it was taken out and centrifuged, and the obtained solid was washed with distilled water until neutral, and then dried in an oven at 105°C. The obtained solid is placed in a muffle furnace for calcination at 700° C. for 3-5 hours in an air atmosphere, and cooled to room temperature to obtain a TiO2 visible light photocatalyst supported by dewatered sludge.
[0029] The obtained catalyst is characterized by SEM, BET, XRD, XPS, such as Figure 1-4 As shown, it can be seen that the obtained sludge loaded with TiO 2 Visible light photocatalysts have meso-mesoporous dual-pore...
Embodiment 2
[0031] Preparation of dewatered sludge-loaded TiO2 visible light photocatalyst: as in Example 1, the difference is that the calcination temperature range of the muffle furnace is from 400-900°C. Comparing the degradation reaction rates of the catalysts prepared at different temperatures to p-nitrophenol under visible light irradiation, it can be seen that the photocatalyst prepared at 700°C has the best effect.
Embodiment 3
[0033] Preparation of Dewatered Sludge Loaded TiO 2 Visible light photocatalyst: as in Example 1, the difference is that the amount of dewatered sludge added ranges from 0 to 30 g. Comparing the degradation reaction rate of p-nitrophenol under visible light irradiation by catalysts obtained under different sludge amounts, it can be seen that the photocatalyst prepared with 10g sludge has the best effect.
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Abstract
The invention relates to a preparation method of a sludge TiO2-loaded visible light photocatalytic material. The preparation method comprises the steps: utilizing an advantage of using sludge as a natural carrier, a part of metals, heavy metals and inorganic substances in the sludge are dissolved out by an acid, but a part of organic substances in the sludge are retained to exist in a solid form, then under certain pressure and temperature conditions, nano TiO2 formation, heavy metal doping and combination of TiO2 and the carrier are carried out through a hydrothermal reaction, finally, TiO2 crystals are formed through high temperature calcination, bound water and organic substances in the sludge carrier are removed, and thus the visible light photocatalytic material loaded with TiO2, having a porous structure and composed of C, P, S, Na, Mg, Al, Si, K, Ca, Ti, Cr, Cu, Fe and other elements is formed. The preparation method can successfully achieve reutilization of the sludge, also makes full use of various inorganic substances and solid organic substances enriched in the sludge, and allows the prepared sludge TiO2-loaded catalytic material to have the performance significantly improved compared with a material before being loaded on sludge; and the preparation method has the advantages of low preparation cost, simple and feasible operation, and easy large-scale popularization.
Description
technical field [0001] The invention belongs to the field of environmental catalytic materials, and relates to the resource utilization of sludge and sludge-loaded TiO that can be used for pollutant degradation 2 Preparation method of visible light photocatalytic material. Background technique [0002] Since the "Twelfth Five-Year Plan", my country's sewage treatment capacity and treatment rate have grown rapidly, and the sewage treatment market has shifted from facility construction to operation. With the improvement of the operation market, the problem of sludge has become prominent. It is predicted that by 2015, the annual output of wet sludge (with a moisture content of 80%) from urban sewage treatment plants will reach 33.59 million tons. Traditional sludge treatment methods, such as landfill, open storage and outbound transportation, have been unable to adapt to the increasingly stringent sludge treatment and disposal standards. Therefore, it is of great environmental...
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