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Solid photocatalyst with visible-light response and selectivity as well as preparation method and application of solid photocatalyst

A photocatalyst and selective technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of non-selective characteristics and achieve high The effects of stability, high catalytic efficiency, and high photoactivity

Inactive Publication Date: 2014-04-16
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the study reported that the reaction mechanism is a hydroxyl radical mechanism, indicating that it is not selective.

Method used

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  • Solid photocatalyst with visible-light response and selectivity as well as preparation method and application of solid photocatalyst
  • Solid photocatalyst with visible-light response and selectivity as well as preparation method and application of solid photocatalyst
  • Solid photocatalyst with visible-light response and selectivity as well as preparation method and application of solid photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, preparation solid photocatalyst

[0030] Synthesis of 4,4'-dicarboxy-2,2'-dipyridine platinum(II) chloride:

[0031] Nucleosynthesis was carried out according to the method reported in the literature (Ozawa, H.; Haga M.; Sakai K.J.Am.Chem.Soc. 2006, 128, 4926-4927.), and the absorption spectrum of the product was tested, which was consistent with the literature report.

[0032] 20g K 2 PtCl 4 Dissolve in 100mL water, add dropwise to 7mL DMSO, stir at room temperature for 3 hours, filter the precipitate, wash, collect, and dry. Take 1.06g of the above precipitate and dissolve it in 100mL of methanol, add 0.49g of 4,4'-dicarboxy-2,2'-bipyridine, heat and stir in a 250mL pressure bottle at 120°C for about 5 hours, the product is yellow 4,4 '-Dicarboxy-2,2'-dipyridylplatinum(II) chloride precipitated, which was collected by filtration and dried in vacuo. The yield is about 65%.

[0033] Dissolve 0.2g of the above Pt complex into 100mL of water (molar conc...

Embodiment 2

[0036] Embodiment 2, preparation solid photocatalyst

[0037] Dissolve 500mg of cis-bis(isothiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxy)ruthenium(II) (purchased from Shanghai Dibo Chemical Technology Co., Ltd.) into 200mL In water (molar concentration is 0.0036mol / L), add 0.01mol / L KOH to adjust the pH to about 10, stir well to dissolve it. Slowly add 2g of P25-TiO that has been washed and dried in advance (washed with 0.01M nitric acid for 2 hours, then washed with deionized water until neutral, and filtered) under stirring. 2 , the mixture was stirred at 40°C for 24 hours at room temperature, and the two carboxyl anions in the 4,4'-dicarboxy-2,2'-bipyridine molecule were adsorbed on the surface of titanium dioxide through bonding, and then the above-mentioned loaded solid The photocatalyst was collected by centrifugation, washed with water, filtered, and repeated three times. After centrifugation, it was vacuum-dried at room temperature for 24 hours to obtain a yellow soli...

Embodiment 3

[0040] Embodiment 3, preparation solid photocatalyst

[0041] Weigh 12.5g SnCl 2 2H 2 O (purchased from Sinopharm Chemical Reagent Co., Ltd.) was added into a round bottom flask with 100mL of absolute ethanol, and refluxed at 80°C for 4 hours to form a uniform sol. Then, 25mL of acetylacetone was slowly added dropwise under magnetic stirring, and the mixture was added dropwise Ammonia water was used to adjust the pH to around 9 to form a sol. After standing and aging for a certain period of time, vacuum filtration, the precipitate was washed with water and alcohol for 3 times, collected by centrifugation, dried at 100°C, and calcined at 600°C for 2 hours in a tube furnace to obtain SnO 2 Nano photocatalytic semiconductor material with an average particle size of 50nm.

[0042] Dissolve 0.2g of 4,4'-dicarboxy-2,2'-bipyridine platinum dichloride (II) in 100mL of water (molar concentration is 0.004mol / L), add 0.01mol / L KOH to adjust the pH to about 10, fully Stir to dissolve....

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Abstract

The invention discloses a solid photocatalyst with visible-light response and selectivity as well as a preparation method and application of solid photocatalyst. The solid photocatalyst comprises metal semiconductor nanoparticles and a metal complex loaded on the metal semiconductor nanoparticles, wherein the metal semiconductor nanoparticles are selected from at least one of titanium dioxide, tin dioxide, zinc oxide and cadmium sulfide; central metal ions of the metal complex are selected from platinum (II), ruthenium (II) or iron (II), and a ligand in the metal complex is an organic or inorganic ligand; in the solid photocatalyst, the mass content of the metal complex is 1-100mg / g. The solid photocatalyst can be used for selective degradation treatment of low-concentration toxic phenolic pollutants in various low-toxin high-concentration pollutants and selective oxidation of organic matters, also can be used for treating industrial wastewater, and has the characteristics of simple preparation process and high catalytic efficiency.

Description

technical field [0001] The invention relates to a visible light responsive and selective solid photocatalyst, its preparation method and application. Background technique [0002] At present, water resource pollution is one of the problems that countries all over the world are facing urgently. As an advanced oxidation technology, the photocatalytic synthesis of titanium dioxide has attracted widespread attention due to its good stability, low cost, and environmental friendliness. But TiO 2 Oxidation technology mainly uses dissolved oxygen to generate oxygen under the excitation of ultraviolet light. · OH radicals decompose organic pollutants until they are oxidized and fully mineralized, while · The degradation of pollutants by OH radicals is not selective, so far, TiO 2 Oxidation technology has not really realized the selective degradation of highly toxic and low-concentration pollutants in the presence of high-concentration and low-toxic pollutants. And since TiO 2 T...

Claims

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Application Information

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IPC IPC(8): B01J31/38B01J31/26C02F1/30C02F1/58C02F101/36C02F101/34
CPCY02W10/37
Inventor 李静李泽华连璐诗
Owner CHINA AGRI UNIV
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