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Preparation method and applications of biomass modified TiO2 visible light photocatalyst

A photocatalyst and biomass technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, water pollutants, etc., can solve the problems of restricting industrial applications and low photocatalytic quantum efficiency, and achieve improved quantum efficiency and ratio Large surface area for easily controlled effects

Active Publication Date: 2014-07-16
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its large forbidden band width (≈3.2eV), it can only respond to ultraviolet light, the utilization rate of sunlight is only about 4%, and the photocatalytic quantum efficiency is low, which limits industrial applications.

Method used

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  • Preparation method and applications of biomass modified TiO2 visible light photocatalyst
  • Preparation method and applications of biomass modified TiO2 visible light photocatalyst
  • Preparation method and applications of biomass modified TiO2 visible light photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Hydrolyze 10 ml of tetrabutyl titanate in 90 ml of acidic solution with pH=5 to obtain uniform transparent TiO 2 2.3 wt% TiO 2 Sol, adjusted by dialysis to obtain TiO with a pH value of 6 2 Sol.

[0031] (2) After drying 2 grams of soybean orange stalks and crushing them into 200 meshes, add them to TiO 2 sol, stirred at room temperature for 2h, the prepared soybean orange stem-TiO 2 Sol mixture.

[0032] (3) Soybean orange stalk-TiO 2 Soybean orange stalk-TiO was prepared by microwave drying method of sol mixture 2 Gel, the microwave frequency used is 2450 MHz and the power is 500W.

[0033] (4) The obtained soybean orange stalk-TiO 2 The gel was calcined in a calcination furnace at 200°C for 5h to obtain soybean orange stalk-modified TiO 2 Nano visible light photocatalyst.

[0034] Soybean straw modified TiO 2 The X-ray diffraction pattern and UV-visible diffuse reflectance pattern of the visible light photocatalyst are shown in Fig. 1 and Fig. 2 .

Embodiment 2

[0036] (1) 11 milliliters of tetraisopropyl titanate were hydrolyzed in 89 milliliters of pH=3 acidic solution to obtain uniform transparent TiO 2 3.0 wt% TiO 2 sol, TiO with pH 6 was obtained by dialysis 2 Sol.

[0037] (2) After crushing 5 grams of dry cow dung into 100 meshes, add it to TiO 2 Sol, stirred at room temperature for 3h, the dry cow dung-TiO 2 Sol mixture.

[0038] (3) Dry cow dung-TiO 2 The sol mixture was heated and dried under stirring to obtain dry cow dung-TiO 2 Gel, the heating temperature is 120°C.

[0039] (4) the obtained dry cow dung-TiO 2 The gel was calcined in a calcination furnace at 300 °C for 3 h to obtain cow dung modified TiO 2 Visible light photocatalyst.

Embodiment 3

[0041] (1) Hydrolyze 17.5 ml of tetrabutyl titanate in 82.5 ml of alkaline solution with pH=8.5 to obtain uniform transparent TiO 2 4.0 wt% TiO 2 Sol, adjusted by dialysis to obtain TiO with a pH value of 7 2 Sol.

[0042] (2) After drying and grinding 7 grams of sawdust into 150 mesh, add TiO 2 Sol, stirred at room temperature for 1h, sawdust-TiO 2 Sol mixture.

[0043] (3) Sawdust-TiO 2 Sawdust-TiO was prepared from sol mixture by microwave drying method 2 For sol-gel, the microwave frequency used is 2450 MHz and the power is 600 W.

[0044] (4) Calcining the obtained gel at 300°C for 3h to obtain sawdust modified TiO 2 Visible light photocatalyst.

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Abstract

The invention discloses a biomass modified TiO2 visible light photocatalyst. A preparation method of the biomass modified TiO2 visible light photocatalyst comprises the following steps: hydrolyzing titanium alkoxide to obtain sol, adding biomass in the sol and stirring, drying the sol to obtain gel, and calcining the gel. According to the preparation method, the reaction conditions are moderate and easy to control, raw materials are easily available, the synthesis process is simple, industrialized production is achieved easily, the prepared biomass modified TiO2 visible light photocatalyst has the performance of photocatalytically degrading organic substances by visible light and can be used for photocatalytically treating organic pollutants in air, soil and wastewater.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, in particular to biomass modified TiO 2 Preparation method and application of visible light photocatalyst. Background technique [0002] TiO 2 It has the characteristics of high catalytic activity, good stability, low price, non-toxicity, and environmental friendliness. It has been widely used in wastewater treatment, water purification, air purification, antibacterial and other fields. However, due to its large forbidden band width (≈3.2eV), it can only respond to ultraviolet light, the utilization rate of sunlight is only about 4%, and the photocatalytic quantum efficiency is low, which limits the industrial application. Therefore, for TiO 2 For performance improvement, increase TiO 2 The spectral response in the visible light range and its photocatalytic quantum efficiency have important significance and application value, and have become one of the research hotspots in the field of pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/18B01J35/10A62D3/17C02F1/30A62D101/26A62D101/28C02F101/34C02F101/38
CPCY02W10/37
Inventor 薛珲陈庆华张议文钱庆荣黄宝铨肖荔人许兢
Owner FUJIAN NORMAL UNIV
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