Preparation method and application of walnut shell organic matter carbon-doped titanium dioxide photocatalyst

A titanium dioxide, organic carbon technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low photocatalytic efficiency, low removal rate of dye organic matter, etc., to achieve good reaction activity, application Promising prospects and improved utilization

Active Publication Date: 2019-07-09
LULIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve TiO 2 As a photocatalyst, there are technical problems such as low removal rate of dye organic matter and low photocatalytic efficiency, and a preparation method and application of walnut shell organic matter carbon-doped titanium dioxide photocatalyst are provided.

Method used

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  • Preparation method and application of walnut shell organic matter carbon-doped titanium dioxide photocatalyst
  • Preparation method and application of walnut shell organic matter carbon-doped titanium dioxide photocatalyst
  • Preparation method and application of walnut shell organic matter carbon-doped titanium dioxide photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] TiO 2 Determining the optimal ratio with walnut shells

[0039] 20% Pb(NO 3 ) 2 Solution 10mL, investigate TiO 2 Ratios to walnut shells (1:1, 1:2, 1:3, 1:4, 1:5) to TiO 2 Effects of photocatalysts on catalytic efficiency. The measured data after catalysis are shown in Table 1 and figure 1 .

[0040] Table 1 TiO 2 ratio to walnut shells

[0041]

[0042] It can be seen from Table 1 that when TiO 2 When the ratio to walnut shell is 1:2, the prepared new photocatalyst has the best catalytic efficiency.

Embodiment 2

[0044] Pb(NO 3 ) 2 Determination of the optimal dosage of

[0045] immobilized TiO 2 The ratio to walnut shell is 1:2, and the concentration of Pb(NO) is 20%. 3 ) 2 The effect of the dosage (5mL, 10mL, 15mL, 20mL, 25mL) on the catalytic efficiency of the new photocatalyst. The measured data after catalysis are shown in Table 2, figure 2 :

[0046] Table 2 Pb(NO 3 ) 2 dosage

[0047]

[0048] by the curve figure 2 The trend can be seen that when Pb(NO 3 ) 2 The dosage of 10mL and 15mL has a trend of rising first and then decreasing, so the optimal dosage is between 10mL and 15mL. Therefore, change the Pb(NO 3 ) 2 to find the optimum dosage. This results in Table 3:

[0049] Table 3 Pb(NO 3 ) 2 dosage

[0050]

[0051] It can be seen from Table 3 that when 20% of Pb (NO 3 ) 2 When the dosage is 13mL, the catalytic efficiency is the best.

[0052] To sum up: when the carbonization temperature is 500°C, the carbonization time is 3h, and 20% Pb(NO 3 ) ...

Embodiment 3

[0054] Catalysis of different organic dyes with new photocatalysts prepared under optimal conditions.

[0055] For the colored indicators such as 25mg / L acid fuchsin as shown in Table 4, measure their absorbance respectively, put 1g of new photocatalysts prepared under optimal conditions into each, and irradiate them under a UV lamp with a wavelength of 365nm for 30min. Irradiate for 60min, and then measure the absorbance after decomposition. The data are shown in Table 4:

[0056] Table 4

[0057]

[0058] It can be seen from Table 4: the aqueous solution of acid chrome blue K indicator is rose-red with a wavelength of 620-760 nm, the aqueous solution of crystal violet indicator is purple, and its wavelength is 350-455 nm, and the aqueous solution of acidic magenta is red, and its wavelength is 620- 750nm, Alizarin red color is pink at pH=5, its wavelength is 360-380nm, Naphthol Green B aqueous solution is green, and its wavelength is 492-577nm. Therefore, the catalyst h...

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Abstract

The invention relates to the technical field of visible light catalysts, in particular to a preparation method and application of a walnut shell organic matter carbon-doped titanium dioxide photocatalyst. The method comprises the following steps: a, titanium dioxide dissolution; b, walnut shell adsorption and drying; and c, carbonizing. TiO2 is doped with walnut shell organic matter carbon and lead oxide, multiple wave absorption advantages are fused, and the transmissivity can reach up to 90.3%. The novel combined photocatalyst has the advantages that the reaction activity is better, the utilization rate of sunlight is greatly improved, the catalytic efficiency is greatly improved, the photocatalyst can be recycled and reused, and the application prospect is very considerable.

Description

technical field [0001] The invention relates to the technical field of visible light catalysts, in particular to a preparation method and application of a walnut shell organic carbon-doped titanium dioxide photocatalyst. Background technique [0002] As one of the technologies with broad research prospects developed in recent decades, photocatalysts have made great achievements in treating the environment and developing new energy. Extensive research has been carried out on the preparation and modification of photocatalysts, and the shortcomings in the research process have been continuously made up. In recent years, photocatalysts have been applied to environmental treatment such as decomposing water pollutants and organic pollutants. At present, my country's rivers and lakes are seriously polluted, and most of the pollution sources come from industrial wastewater and domestic sewage. [0003] TiO2 is a photocatalyst with high catalytic efficiency for dyes, stable chemica...

Claims

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Application Information

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IPC IPC(8): B01J21/18C02F1/30C02F101/30
CPCB01J21/18C02F1/30C02F2101/308B01J35/39
Inventor 秦永其杨卫民邓立强王毅郭晨
Owner LULIANG UNIV
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