Houghite photocatalyst based on visible light response and preparation method thereof

A technology of talc light and visible light, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low activity, poor light corrosion resistance, and limited visible light catalytic materials Application and development issues, to achieve the effect of excellent performance, low cost, and easy mass production

Inactive Publication Date: 2011-09-07

BEIJING UNIV OF CHEM TECH

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AI-Extracted Technical Summary

Problems solved by technology

[0004] Currently developed visible light photocatalysts mainly focus on CdS, CdSe, WO 3 , Fe 2 o 3 However, due to its poor pho...

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Method used

Catalyst is characterized: as shown in Fig. 1, by regulating and controlling hydrotalcite laminate element composition and interlayer guest, all can form good hydrotalcite structure, its (003), (006), (110) characteristic peak is obvious . The hydrotalcite photocatalyst synthesized as shown in Figure 2 exhibits good visible light absorption characteristics under the visible light spectrum. It can be seen from Figure 4 that the synthesized catalyst of this type, the hydrotalcite ...

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Abstract

The invention discloses a houghite photocatalyst based on visible light response and a preparation method thereof, belonging to the technical field of preparation of photocatalysts. A series of houghite photocatalysts with response under visible light are synthesized by adopting a nucleation/crystallization separation method. By adjusting and controlling the composition of metal and interlaminar guest ions, a series of photocatalysts with excellent performance and full spectrum absorption under visible light can be obtained. The series of catalysts have very high absorption, can make full use of visible light part of sunlight, have high dye photocatalysis performance, can be applied to photocatalytic degradation of environmental pollutants, and have photocatalytic performance greatly superior to that of the conventional P25TiO2 photocatalyst. The photocatalyst produced by adopting the preparation method has low cost and simple process, is easy and convenient to operate, and is easy for mass production.

Application Domain

Metal/metal-oxides/metal-hydroxide catalysts

Technology Topic

Photocatalytic degradationIon +10

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Examples

Experimental program(6)

Example Embodiment

[0019] 【Example 1】

[0020] 1. Preparation of interlayer anion as NO by nucleation crystallization isolation method 3 - The hydrotalcite colloid:

[0021] a. 0.045mol solid Cu(NO 3 ) 2 ·3H 2 O and 0.0225mol of solid Cr(NO 3 ) 3 9H 2 O dissolved in 45mL to remove CO 2 of deionized water;

[0022] b. Dissolve 0.135mol of NaOH in 45mL to remove CO 2 of deionized water;

[0023] c. Add the above two mixed solutions prepared by step a and step b into the rotary liquid film reactor at the same time, adjust the slit width between the reactor rotor and the stator to be 2mm, the operating voltage is 85V, the rotor speed is 5000rpm, and the rotation time 2min;

[0024] 2. Add the obtained hydrotalcite colloid into the reaction kettle, crystallize at 120°C for 24 hours, take it out, cool it to room temperature, wash it thoroughly with deionized water until the pH of the supernatant is 7, and store it at 60°C After drying for 12 hours and grinding, a hydrotalcite photocatalyst based on visible light response is obtained.

[0025] Take by weighing 3.5mg of this catalyst, add it in the solution in 3.5ml sulfonated rhodamine B solution (10ppm), after dark reaction adsorption for 0.5h, under visible light (λ>400nm) irradiation, adopt ultraviolet-visible spectrophotometer to measure The curve of the absorption peak of the dye versus time, to study the relationship of the residual concentration fraction of the dye versus time.

[0026] To characterize the catalyst: by figure 1 It can be seen that by adjusting the element composition of the hydrotalcite layer and the interlayer guest, a good hydrotalcite structure can be formed, and the characteristic peaks of (003), (006), and (110) are obvious. like figure 2 The synthesized hydrotalcite photocatalyst shown has good visible light absorption characteristics under the visible light spectrum. Depend on Figure 4 It can be seen that the synthesized catalyst of this type, the hydrotalcite with nitrate between the layers, has excellent photocatalytic performance compared with P25.

Example Embodiment

[0027] [Example 2]

[0028] 1. Preparation of interlayer anion as NO by nucleation crystallization isolation method 3 - The hydrotalcite colloid:

[0029] a. 0.05mol solid Ni (NO 3 ) 2 ·6H 2 O and 0.025mol of solid Cr(NO 3 ) 3 9H 2 O dissolved in 120mL to remove CO 2 of deionized water;

[0030] b. Dissolve 0.35mol NaOH in 100mL to remove CO 2 of deionized water;

[0031] c. Add the above two mixed solutions prepared by step a and step b into the rotary liquid film reactor at the same time, adjust the slit width between the reactor rotor and the stator to be 2mm, the operating voltage is 85V, the rotor speed is 5000rpm, and the rotation time 2min;

[0032]2. Add the obtained hydrotalcite colloid into the reaction kettle, crystallize at 120°C for 24 hours, take it out, cool it to room temperature, wash it thoroughly with deionized water until the pH of the supernatant is 7, and store it at 60°C After drying for 12 hours and grinding, a hydrotalcite photocatalyst based on visible light response is obtained.

[0033] Take by weighing 3.5mg of this catalyst, add it to the solution in 3.5ml sulfonated rhodamine B solution (10ppm), after dark reaction adsorption for 0.5h, under the irradiation of visible light (λ > 400nm), adopt the ultraviolet-visible spectrophotometer to measure The curve of the absorption peak of the dye versus time, to study the relationship of the residual concentration fraction of the dye versus time.

[0034] To characterize the catalyst: by figure 1 It can be seen that the hydrotalcite structure with good crystal form is synthesized by this method, and the interlayer is composed of nitrate. like figure 2 The synthesized hydrotalcite catalyst shown has good visible light absorption characteristics under the visible light spectrum. Depend on Figure 4 It can be seen that the synthesized catalyst whose main elements are Ni and Cr, and the hydrotalcite with nitrate between the layers has excellent photocatalytic performance compared with P25.

Example Embodiment

[0035] [Example 3]

[0036] 1. Preparation of interlayer anion as NO by nucleation crystallization isolation method 3 - The hydrotalcite colloid:

[0037] a. 0.072mol solid Zn(NO 3 ) 2 ·6H 2 O and 0.036mol of solid Cr(NO 3 ) 3 9H 2 O dissolved in 60mL to remove CO 2 of deionized water;

[0038] b. Dissolve 0.24mol NaOH in 80mL to remove CO 2 of deionized water;

[0039] c. Add the above two mixed solutions prepared by step a and step b into the rotary liquid film reactor at the same time, adjust the slit width between the reactor rotor and the stator to be 2mm, the operating voltage is 85V, the rotor speed is 5000rpm, and the stirring time 2min;

[0040] 2. Add the obtained hydrotalcite colloid into the reaction kettle, crystallize at 120°C for 24 hours, take it out, cool it to room temperature, wash it thoroughly with deionized water until the pH of the supernatant is 7, and store it at 60°C After drying for 12 hours and grinding, a hydrotalcite photocatalyst based on visible light response is obtained.

[0041] Take by weighing 3.5mg of this catalyst, add it to the solution in 3.5ml sulfonated rhodamine B solution (10ppm), after dark reaction adsorption for 0.5h, under the irradiation of visible light (λ > 400nm), adopt the ultraviolet-visible spectrophotometer to measure The curve of the absorption peak of the dye versus time, to study the relationship of the residual concentration fraction of the dye versus time.

[0042] To characterize the catalyst: by figure 1 It can be seen that the hydrotalcite structure with good crystal form is synthesized by this method, the main layer is composed of Zn and Cr, and the interlayer is composed of nitrate. like figure 2 The synthesized hydrotalcite photocatalyst shown has good visible light absorption characteristics under the visible light spectrum. Depend on Figure 4 It can be seen that the synthesized catalyst whose main elements are Zn and Cr, and the hydrotalcite with nitrate between the layers has excellent photocatalytic performance compared with P25.

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Classification and recommendation of technical efficacy words

Excellent performance
Strong absorption

Houghite photocatalyst based on visible light response and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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