Preparation method of meerschaum-loaded porphyrin-sensitized Bi2WO6 visible light-driven photocatalyst

A sepiolite, visible light technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high photogenerated electron-hole recombination rate and organic matter degradation. It can improve the adsorption and enrichment capacity, promote separation, and excellent visible light catalytic activity.

Active Publication Date: 2016-11-09
XIANGTAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the invention is to solve the problem of pure Bi 2 WO 6 Photocatalysts have low incident light utilization efficiency, high photogenerated electron-hole recombination rate, and low organic degradation rate, and provide a sepiolite-supported porphyrin sensitized Bi 2 WO 6 Preparation method of visible light catalyst

Method used

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  • Preparation method of meerschaum-loaded porphyrin-sensitized Bi2WO6 visible light-driven photocatalyst
  • Preparation method of meerschaum-loaded porphyrin-sensitized Bi2WO6 visible light-driven photocatalyst
  • Preparation method of meerschaum-loaded porphyrin-sensitized Bi2WO6 visible light-driven photocatalyst

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Effect test

Embodiment 1

[0022] Co-THPP / Bi 2 WO 6 / Acid-modified sepiolite composite visible light catalyst (Co-THPP / Bi 2 WO 6 / Acid-Sep) preparation, including the following steps:

[0023] (1) Slowly add purified sepiolite to a mass fraction of 10% HCl (liquid-solid mass ratio 10:1), stir at room temperature for 2 hours, remove the supernatant after the reaction is complete, wash with water until neutral, and dry in an oven Dry it and grind it finely. Calcined at 500°C for 5 hours in a muffle furnace to obtain acid-modified sepiolite.

[0024] (2) Dissolve Na with deionized water 2 WO 4 2H 2 O (0.5 g), add the above modified sepiolite (5 g) and stir for 0.5 h. Add Bi(NO 3 ) 3 ·5H 2 O, and 1~3mg of cobalt-tetrakis-(p-hydroxyphenyl)porphyrin (Co-THPP), stirred at room temperature for 8 hours, then transferred to a hydrothermal kettle, and reacted at 150°C for 24 hours.

[0025] (3) Naturally cool the hydrothermal reaction product in step (2) to room temperature, filter and wash three time...

Embodiment 2

[0031] MgTHPP / Bi 2 WO 6 / Acid-modified sepiolite composite visible light catalyst (Mg-THPP / Bi 2 WO 6 / Acid-Sep) preparation, including the following steps:

[0032] (1) Slowly add purified sepiolite to 12% HCl (liquid-solid mass ratio 10:1), stir at room temperature for 3 hours, remove the supernatant after the reaction is complete, wash with water until neutral, and place in an oven to dry Dry it and grind it finely. Calcined at 500°C for 4 hours in a muffle furnace to obtain acid-modified sepiolite.

[0033] (2) Dissolve Na with deionized water 2 WO 4 2H 2 O (0.5 g), add the above modified sepiolite (5 g) and stir for 1 h. Add Bi(NO 3 ) 3 ·5H 2 O, and 1~3mg of magnesium-tetrakis-(p-hydroxyphenyl)porphyrin (Mg-THPP), stirred at room temperature for 3 hours, then transferred to a hydrothermal kettle, and reacted at 180°C for 16 hours.

[0034] (3) Naturally cool the hydrothermal reaction product in step (2) to room temperature, filter and wash 4 times with deioniz...

Embodiment 3

[0037] ZnTHPP / Bi 2 WO 6 / Acid-modified sepiolite composite visible light catalyst (Zn-THPP / Bi 2 WO 6 / Acid-Sep) preparation, including the following steps:

[0038] (1) Slowly add purified sepiolite to a mass fraction of 8% HCl (liquid-solid mass ratio 10:1), stir for 4 hours at room temperature, remove the supernatant after the reaction is complete, wash with water until neutral, and dry in an oven Dry it and grind it finely. Calcined at 400°C for 6 hours in a muffle furnace to obtain acid-modified sepiolite.

[0039] (2) Dissolve Na with deionized water 2 WO 4 2H 2 O (0.5 g), add the above modified sepiolite (5 g) and stir for 1.5 h. Add Bi(NO 3 ) 3 ·5H 2 O, and 1~3mg of zinc-tetrakis-(p-hydroxyphenyl)porphyrin (Zn-THPP), stirred at room temperature for 15 hours, then transferred to a hydrothermal kettle, and reacted at 140°C for 48 hours.

[0040] (3) Naturally cool the hydrothermal reaction product in step (2) to room temperature, filter and wash twice with de...

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Abstract

The invention discloses a preparation method of a meerschaum-loaded porphyrin-sensitized Bi2WO6 visible light-driven photocatalyst. Modified meerschaum is used as a carrier and Bi2WO6 is modified by porphyrin as a sensitizing agent so that the meerschaum-loaded porphyrin-sensitized Bi2WO6 visible light-driven photocatalyst is obtained. The photocatalyst has excellent visible light-driven photocatalytic activity and substantially improves photoinduced electron and cavity separating efficiency and sunlight clean energy utilization efficiency. Through carrying reinforcement of porphyrin-sensitized Bi2WO6 with modified meerschaum with a large specific surface area and stable performances, the visible light-driven photocatalyst has obvious adsorption and enrichment effects on pollutant molecules.

Description

technical field [0001] The invention belongs to the technical field of preparation of supported semiconductor materials, in particular to a sepiolite-loaded porphyrin sensitized Bi 2 WO 6 Photocatalytic composites. Background technique [0002] Water pollution seriously threatens human health and the ecological environment. Traditional physical, chemical and biological degradation water treatment technologies have unsatisfactory purification effects on wastewater and have the disadvantages of secondary pollution and long treatment time. Therefore, it is urgent to develop efficient and green water pollution control technologies. Titanium dioxide photocatalytic degradation of wastewater has the advantages of high degradation rate, low cost, non-toxicity, and good chemical stability. However, due to the wide band gap (3.2 eV) of titanium dioxide, only ultraviolet light in sunlight can be used, resulting in low utilization efficiency of solar energy. [0003] Bismuth tungsta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C02F1/30C02F1/28C02F101/30
CPCY02W10/37B01J35/004B01J31/22B01J2531/0238B01J2531/22B01J2531/26B01J2531/845C02F1/285C02F1/30C02F2101/30
Inventor 熊绍锋刘平乐朱启超刘佳鑫
Owner XIANGTAN UNIV
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