WO2019051745A1 - Method for preparing surface-modified carbon quantum dot-titanium dioxide composite photocatalyst - Google Patents
Method for preparing surface-modified carbon quantum dot-titanium dioxide composite photocatalyst Download PDFInfo
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- WO2019051745A1 WO2019051745A1 PCT/CN2017/101809 CN2017101809W WO2019051745A1 WO 2019051745 A1 WO2019051745 A1 WO 2019051745A1 CN 2017101809 W CN2017101809 W CN 2017101809W WO 2019051745 A1 WO2019051745 A1 WO 2019051745A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
Definitions
- the invention relates to a method for preparing a surface modified carbon quantum dot-titanium dioxide composite photocatalyst.
- titanium dioxide photocatalytic materials Since the discovery of titanium dioxide to decompose water into oxygen and hydrogen under visible light irradiation, titanium dioxide photocatalytic materials have received continuous and extensive attention.
- the main methods for preparing the titanium dioxide photocatalyst include a sol-gel method, a hydrothermal method, a precipitation method, a dipping method, a microemulsion method, a meteorological hydrolysis method, a supergravity method, and the like.
- the raw materials for preparing TiO 2 by hydrothermal method are mostly tetrabutyl titanate and TiCl 4 , and the research on hydrothermal synthesis using titanium sulfate is relatively rare. Titanium sulphate is weaker than liquid titanium salt, which is easier and more convenient to operate, and has a wide range of applications in industry.
- Carbon quantum dots are a class of zero-dimensional carbon nanomaterials with a good fluorescence performance of less than 10 nm. When the single-walled carbon nanotubes were purified by electrophoresis in 2004, the particle size was only 1 to 10 nm. The large specific surface area, the surface modification by organic matter, makes the carbon quantum dots more stable, and the carbon quantum dots have up-conversion luminescence properties and semiconductor properties, and have important applications in the field of photocatalysis.
- a method for preparing a surface-modified carbon quantum dot-titanium dioxide composite photocatalyst comprises the following steps: adding 20-30 parts of ethylene glycol to a reaction kettle, heating in an oven at 170-190 ° C for 3-5 hours, and taking it after centrifugation The supernatant is added with 0.5-1.5 parts of ammonia water, mixed uniformly, and incubated at 100-110 ° C for 2-4 h. After cooling, the supernatant is centrifuged to obtain a modified carbon quantum dot solution; 5-7 parts of Ti(SO 4 ) 2 Add 40-50 parts of deionized water, adjust to pH 1.5-2.5 with concentrated hydrochloric acid, seal, and then heat in the oven at 180-190 °C for 11-13h.
- the method is placed in an oven and heated at 180 ° C for 4 h.
- the temperature is maintained at 105 ° C for 3 h.
- the pH is adjusted to 2 with concentrated hydrochloric acid.
- the method is heated in an oven at 185 ° C for 12 h.
- the precipitate is dried under vacuum at 42 °C.
- the magnetic stirring is carried out for 3 h, and then it is transferred to a blast drying oven and dried at 75 ° C for 4 h.
- the method provided by the invention is simple and easy to operate, and a composite photocatalyst excellent in catalytic effect can be obtained.
- a method for preparing a surface-modified carbon quantum dot-titanium dioxide composite photocatalyst comprises the steps of: adding 25 parts of ethylene glycol to a reaction kettle, heating in an oven at 180 ° C for 4 hours, and taking the supernatant after centrifugation, adding 1 A portion of ammonia water, mixed evenly, kept at 105 ° C for 3h, cooled, centrifuged to remove the supernatant to obtain a modified carbon quantum dot solution; 6 parts of Ti (SO 4 ) 2 was added to 45 parts of deionized water, adjusted to pH with concentrated hydrochloric acid The value is 2, after sealing, it is heated in an oven at 185 ° C for 12 h.
- the mixture is centrifuged, washed 4 times with water, and the precipitate is vacuum dried at 42 ° C, and then ground in a mortar to prepare a sample of nano TiO 2 ;
- a good TiO 2 was placed in a beaker, the quantum dot solution prepared above was added, and then 15 parts of deionized water was added, magnetically stirred for 3 hours, and then transferred to a blast drying oven at 75 ° C for 4 hours, and cooled to obtain; All are parts by weight.
- a method for preparing a surface-modified carbon quantum dot-titanium dioxide composite photocatalyst comprises the steps of: adding 20 parts of ethylene glycol to a reaction kettle, heating in an oven at 170 ° C for 3 hours, taking the supernatant after centrifugation, adding 0.5 A portion of ammonia water, mixed evenly, incubated at 100 ° C for 2h, cooled, centrifuged to remove the supernatant to obtain a modified carbon quantum dot solution; 5 parts of Ti (SO 4 ) 2 was added to 40 parts of deionized water, adjusted to pH with concentrated hydrochloric acid The value is 1.5, after sealing, it is heated in an oven at 180 ° C for 11 h.
- the mixture is taken out and centrifuged, and washed three times with water.
- the precipitate is vacuum dried at 40 ° C and then ground in a mortar to prepare a sample of nano TiO 2 ;
- a good TiO 2 was placed in a beaker, the quantum dot solution prepared above was added, and then 10 parts of deionized water was added, and magnetically stirred for 2 hours, and then transferred to a blast drying oven at 70 ° C for 3 hours, and cooled to obtain; All are parts by weight.
- a method for preparing a surface-modified carbon quantum dot-titanium dioxide composite photocatalyst comprises the following steps: adding 30 parts of ethylene glycol to a reaction kettle, heating in an oven at 190 ° C for 5 hours, centrifuging, taking the supernatant, and adding 1.5 A portion of ammonia water, mixed uniformly, kept at 110 ° C for 4h, cooled, centrifuged to remove the supernatant to obtain a modified carbon quantum dot solution; 5-7 parts of Ti (SO 4 ) 2 was added to 50 parts of deionized water, adjusted with concentrated hydrochloric acid After the pH is 2.5, after sealing, it is heated in an oven at 190 ° C for 13 h.
- the mixture is taken out and centrifuged, and washed with water for 5 times.
- the precipitate is vacuum dried at 45 ° C and then ground in a mortar to obtain a sample of nano TiO 2 ;
- the prepared TiO 2 was placed in a beaker, the quantum dot solution prepared above was added, and then 20 parts of deionized water was added, and magnetically stirred for 4 hours, and then transferred to a blast drying oven at 80 ° C for 5 hours, and cooled; Each raw material is in parts by weight.
- the method provided by the invention is simple and easy to operate, and a composite photocatalyst excellent in catalytic effect can be obtained.
Abstract
Description
Claims (7)
- 一种制备表面改性碳量子点-二氧化钛复合光催化剂方法,其特征在于包括如下步骤:将20-30份乙二醇加入反应釜中,放入烘箱中于170-190℃加热3-5h,离心后取上清液,加入0.5-1.5份氨水,混合均匀,于100-110℃保温2-4h,冷却后离心取出上清液得到修饰过的碳量子点溶液;将5-7份Ti(SO4)2加入40-50份去离子水中,用浓盐酸调至pH值为1.5-2.5,密封后,置于烘箱中于180-190℃加热11-13h,反应后取出离心,用水洗涤3-5次,将沉淀在40-45℃真空干燥后用研钵研细,制得纳米TiO2样品;将制备好的TiO2置于烧杯中,加入上述制备的量子点溶液,然后再加入10-20份去离子水,磁力搅拌2-4h,然后将其移入鼓风干燥箱中70-80℃干燥3-5h,冷却即得;各原料均为重量份。A method for preparing a surface-modified carbon quantum dot-titanium dioxide composite photocatalyst, comprising the steps of: adding 20-30 parts of ethylene glycol to a reaction kettle, and heating in an oven at 170-190 ° C for 3-5 hours; After centrifugation, the supernatant is taken, 0.5-1.5 parts of ammonia water is added, mixed uniformly, and incubated at 100-110 ° C for 2-4 h. After cooling, the supernatant is centrifuged to obtain a modified carbon quantum dot solution; 5-7 parts of Ti ( SO 4 ) 2 is added to 40-50 parts of deionized water, adjusted to a pH of 1.5-2.5 with concentrated hydrochloric acid. After sealing, it is heated in an oven at 180-190 ° C for 11-13 h. After the reaction, the mixture is centrifuged and washed with water. -5 times, the precipitate was vacuum dried at 40-45 ° C, and then ground in a mortar to obtain a sample of nano TiO 2 ; the prepared TiO 2 was placed in a beaker, and the quantum dot solution prepared above was added, and then 10 was added. -20 parts of deionized water, magnetically stirred for 2-4h, then transferred to a blast drying oven at 70-80 ° C for 3-5h, cooled to obtain; each raw material is part by weight.
- 根据权利要求1所述的方法,其特征在于:放入烘箱中于180℃加热4h。The method of claim 1 wherein it is placed in an oven and heated at 180 ° C for 4 h.
- 根据权利要求1所述的方法,其特征在于:于105℃保温3h。The method of claim 1 wherein the incubation is carried out at 105 ° C for 3 h.
- 根据权利要求1所述的方法,其特征在于:用浓盐酸调至pH值为2。The method of claim 1 wherein the pH is adjusted to 2 with concentrated hydrochloric acid.
- 根据权利要求1所述的方法,其特征在于:置于烘箱中于185℃加热12h。The method of claim 1 wherein the heating is carried out in an oven at 185 ° C for 12 h.
- 根据权利要求1所述的方法,其特征在于:将沉淀在42℃真空干燥。The method of claim 1 wherein the precipitate is dried under vacuum at 42 °C.
- 根据权利要求1所述的方法,其特征在于:磁力搅拌3h,然后将其移入鼓风干燥箱中75℃干燥4h。 The method according to claim 1, wherein the magnetic stirring is carried out for 3 hours, and then it is transferred to a blast drying oven and dried at 75 ° C for 4 hours.
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CN110180521A (en) * | 2019-06-05 | 2019-08-30 | 陕西科技大学 | A kind of preparation method of carbon quantum dot/titanic oxide nano compound material |
CN110354845A (en) * | 2019-06-28 | 2019-10-22 | 广东工业大学 | A kind of bismuth tungstate photocatalyst and its preparation method and application of carbon nano dot modification |
CN114195365A (en) * | 2021-12-16 | 2022-03-18 | 广州光联电子科技有限公司 | Fluorescent glass based on molecular sieve and preparation method and application thereof |
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Cited By (4)
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CN110180521A (en) * | 2019-06-05 | 2019-08-30 | 陕西科技大学 | A kind of preparation method of carbon quantum dot/titanic oxide nano compound material |
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CN110354845A (en) * | 2019-06-28 | 2019-10-22 | 广东工业大学 | A kind of bismuth tungstate photocatalyst and its preparation method and application of carbon nano dot modification |
CN114195365A (en) * | 2021-12-16 | 2022-03-18 | 广州光联电子科技有限公司 | Fluorescent glass based on molecular sieve and preparation method and application thereof |
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