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Magnetic photocatalyst
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A photocatalyst and magnetic technology, used in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of high price, achieve low price and strong photocatalytic activity Effect
Inactive Publication Date: 2011-11-16
SHUNDE POLYTECHNIC
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Embodiment 1
[0018] It is a kind of magnetic photocatalyst, and the manufacture method of the present invention is as follows:
[0019] a. First mix ferric nitrate and strontium nitrate solution, then add excess citric acid drop by drop, the molar ratio is ferric nitrate: strontium nitrate: citric acid=1:1:6, stir for 15 minutes and place in polytetrafluoroethylene In a lined autoclave, react at 160°C for 13 hours to obtain grass-green SrFeO 3-x Sol, marked as SOL-1; again ferric nitrate and strontium nitrate solution were mixed, then excessive citric acid was added dropwise, the molar ratio was ferric nitrate: strontium nitrate: citric acid=12:1:11.8, stirred for 15 minutes Then put it in a high-pressure reactor lined with polytetrafluoroethylene, and react at 110 ° C for 13 hours to obtain red SrFe 12 o 19 Sol, labeled as SOL-2;
[0020] b. Mix 10ml of SOL-1 and 28ml of SOL-2, stir thoroughly for 32 minutes, then dry to dry gel at 90°C, calcinate the obtained dry gel at 610°C for 1 ho...
Embodiment 2
[0028] It is a kind of magnetic photocatalyst, and the manufacture method of the present invention is as follows:
[0029] a. First mix ferric nitrate and strontium nitrate solution, then add excess citric acid drop by drop, the molar ratio is ferric nitrate: strontium nitrate: citric acid=1:1:6, stir for 13 minutes and place in polytetrafluoroethylene In a lined autoclave, react at 150°C for 12 hours to obtain grass-green SrFeO 3-x Sol, marked as SOL-1; again ferric nitrate and strontium nitrate solution were mixed, and then excessive citric acid was added dropwise, the molar ratio was ferric nitrate: strontium nitrate: citric acid=12:1:11.8, stirred for 13 minutes Then put it in a high-pressure reactor lined with polytetrafluoroethylene, and react at 90 ° C for 12 hours to obtain red SrFe 12 o 19 Sol, labeled as SOL-2;
[0030] b. Mix 10ml of SOL-1 and 12ml of SOL-2, stir thoroughly for 30 minutes, then dry at 70°C to dry gel, calcinate the obtained dry gel at 590°C for 1...
Embodiment 3
[0033] It is a kind of magnetic photocatalyst, and the manufacture method of the present invention is as follows:
[0034] a. First mix ferric nitrate and strontium nitrate solution, then add excess citric acid dropwise, the molar ratio is ferric nitrate: strontium nitrate: citric acid=1:1:6, stir for 14 minutes and place in polytetrafluoroethylene In a lined autoclave, react at 150°C for 12 hours to obtain grass-green SrFeO 3-x Sol, marked as SOL-1; Ferric nitrate and strontium nitrate solution were mixed again, and then excessive citric acid was added dropwise, the molar ratio was ferric nitrate: strontium nitrate: citric acid=12:1:11.8, stirred for 14 minutes Then put it in a high-pressure reactor lined with polytetrafluoroethylene, and react at 100 ° C for 12 hours to obtain red SrFe 12 o 19 Sol, labeled as SOL-2;
[0035] b. Mix 10ml of SOL-1 and 20ml of SOL-2, stir thoroughly for 30 minutes, then dry to dry gel at 90°C, calcinate the obtained dry gel at 600°C for 1 ho...
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Abstract
The invention relates to a magnetic photocatalyst which is characterized by having a manufacturing method comprising ferric nitrate, strontium nitrate and citric acid. The magnetic photocatalyst is prepared by the steps of: a, mixing a ferric nitrate solution with a strontium nitrate solution, dropwise adding excessive citric acid, wherein the mol ratio of the ferric nitrate to the strontium nitrate to the citric acid is 1:1:6; placing into a high-pressure reaction kettle with polytetrafluoroethylene as a lining after stirring for 12-18 min, reacting for 11-13 hours at a temperature of 140-180 DEG C to obtain a grass-green SrFeO3-x sol marked as SOL-1; mixing the ferric nitrate solution with the strontium nitrate solution, dropwise adding excessive citric acid, wherein the mol ratio of the ferric nitrate to the strontium nitrate to the citric acid is 12:1:11.8; placing into the high-pressure reaction kettle with the polytetrafluoroethylene as the lining after stirring for 12-18 min, reacting for 11-13 hours at a temperature of 80-120 DEG C to obtain a red SrFe12O19 sol marked as SOL-2; and b, mixing 10ml of SOL-1 with 4-40ml of SOL-2, drying at a temperature of 60-100 DEG C to form a dried gel after fully stirring for 25-35min; calcining the obtained dried gel for 0.5-1.5 hours at a temperature of 580-620 DEG C, then roasting for 11-13 hours at a temperature of 780-820 DEG C to prepare a magnetic compound photocatalyst SrFeO3-x / SrFe12O19. The magnetic photocatalyst has the advantages of low cost, strong photocatalyst activity, economy, practicability and the like.
Description
technical field [0001] The invention relates to a magnetic photocatalyst. Background technique [0002] One of the existing photocatalysts is TiO 2 , is favored because of its high chemical stability, light corrosion resistance, and harmlessness to the human body. At present, TiO 2 Great progress has been made in the research of "green" engineering such as drinking water treatment, industrial wastewater treatment, air purification, sterilization, self-cleaning and precious metal recovery; however, TiO 2 The application in the degradation of sewage organic matter is mostly based on the suspension system, and the suspension phase TiO 2 It has the disadvantages of easy deactivation and difficult recovery, and TiO 2 Higher price, especially TiO 2 The bandgap width is 3.2eV, and the unfavorable factors such as only responding to ultraviolet light severely limit its wide application in production. [0003] In recent years, magnetic substances and TiO 2 Combined to form a mag...
Claims
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Application Information
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