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Method for preparing magnetic zinc cadmium sulfide composite photocatalyst

A technology of zinc cadmium sulfide and composite light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as difficulty in recycling, complex preparation process of zinc cadmium sulfide, etc., and achieve less equipment and high energy efficiency. The effect of low consumption and simple preparation and operation method

Active Publication Date: 2020-09-22
CHONGQING VOCATIONAL INST OF ENG +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to propose a kind of magnetic zinc cadmium sulfide composite photocatalyst (Mn x Zn 1-x Fe 2 o 4 / C / Zn 0.8 Cd 0.2 S) preparation method, preparation method is simple, cost is low

Method used

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  • Method for preparing magnetic zinc cadmium sulfide composite photocatalyst
  • Method for preparing magnetic zinc cadmium sulfide composite photocatalyst
  • Method for preparing magnetic zinc cadmium sulfide composite photocatalyst

Examples

Experimental program
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Embodiment 1

[0021] A magnetic zinc cadmium sulfide composite photocatalyst (Mn x Zn 1-x Fe 2 O 4 / C / Zn 0.8 Cd 0.2 The preparation method of S), the specific steps are as follows:

[0022] (1) Mn x Zn 1-x Fe 2 O 4 / C preparation

[0023] According to the molar ratio n(MnO):n(ZnO):n(Fe 2 O 3 )=32.8:13.3:53.9, respectively weigh a certain amount of MnSO 4 ·H 2 O, ZnSO 4 ·7H 2 O and Fe 2 (SO 4 ) 3 , Add a certain amount of deionized water and stir well to obtain a uniform mixed solution; weigh a certain amount of NaOH as a precipitant to prepare a NaOH solution with a concentration of 2mol / L; slowly drop the NaOH solution into the mixed solution under magnetic stirring , When there is brown flocculent precipitate in the solution, quickly add NaOH solution dropwise, adjust the pH to 13, and continue to stir for 20 minutes; transfer the stirred solution into a 100 mL reactor, and heat it in an oven at 200°C for 5 hours; After the hydrothermal reaction is completed, take it out and cool it to room te...

Embodiment 2

[0028] A magnetic zinc cadmium sulfide composite photocatalyst (Mn x Zn 1-x Fe 2 O 4 / C / Zn 0.8 Cd 0.2 The preparation method of S), the specific steps are as follows:

[0029] (1) Mn x Zn 1-x Fe 2 O 4 / C preparation

[0030] Same as in Example 1 (1).

[0031] (2) Magnetic composite photocatalyst Mn x Zn 1-x Fe 2 O 4 / C / Zn 0.8 Cd 0.2 Preparation of S

[0032] According to the molar ratio n(Zn 2+ ):n(Cd 2+ ):n(S 2- )=0.8:0.2:1.25, weigh an appropriate amount of Zn(Ac) 2 ·2H 2 O and Cd(Ac) 2 ·2H 2 O, dissolve into 40mL deionized water by ultrasonic, add and theoretically generate Zn 0.8 Cd 0.2 Mn with S mass ratio of 10:100 x Zn 1-x Fe 2 O 4 / C, mechanically stirred for 30min to obtain suspension A; weigh out 0.9g of Na 2 S·9H 2 O ultrasonically dissolved in 40mL deionized water to obtain solution B; under continuous stirring, use a glue-tip dropper to drop solution B into suspension A at a certain rate, continue to stir for a period of time and then leave it for 24 hours; Centrifuge at ...

Embodiment 3

[0034] A magnetic zinc cadmium sulfide composite photocatalyst (Mn x Zn 1-x Fe 2 O 4 / C / Zn 0.8 Cd 0.2 The preparation method of S), the specific steps are as follows:

[0035] (1) Mn x Zn 1-x Fe 2 O 4 / C preparation

[0036] Same as in Example 1 (1).

[0037] (2) Magnetic composite photocatalyst Mn x Zn 1-x Fe 2 O 4 / C / Zn 0.8 Cd 0.2 Preparation of S

[0038] According to the molar ratio n(Zn 2+ ):n(Cd 2+ ):n(S 2- )=0.8:0.2:1.25, weigh an appropriate amount of Zn(Ac) 2 ·2H 2 O and Cd(Ac) 2 ·2H 2 O, dissolve into 40mL deionized water by ultrasonic, add and theoretically generate Zn 0.8 Cd 0.2 Mn with S mass ratio of 15:100 x Zn 1-x Fe 2 O 4 / C, mechanically stirred for 30min to obtain suspension A; weigh out 0.9g of Na 2 S·9H 2 O ultrasonically dissolved in 40mL deionized water to obtain solution B; under continuous stirring, use a glue-tip dropper to drop solution B into suspension A at a certain rate, continue to stir for a period of time and then leave it for 24 hours; Centrifuge at ...

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Abstract

The invention discloses a preparation method of a magnetic zinc cadmium sulfide composite photocatalyst, and belongs to the field of inorganic catalysts. The preparation method comprises the followingsteps of: preparing soft magnetic materials, namely manganese zinc ferrites MnxZn1-xFe2O4 and MnxZn1-xFe2O4 / C, by using a hydrothermal method, and then preparing a magnetic cadmium sulfide compositephotocatalyst (MnxZn1-xFe2O4 / C / Zn0. 8Cd0.2S) by using an impregnation precipitation method. The method is simple in preparation process, little in used equipment and low in energy consumption. The prepared MnxZn1-xFe2O4 / C / Zn0. 8Cd0.2S is stable in magnetic performance and high in photocatalytic activity; under the irradiation of a simulated sunlight xenon lamp, 100mL of a rhodamine B solution witha concentration of 10mg / L is degraded through 0.1g of the prepared composite magnetic photocatalyst, the degradation rate of rhodamine B reaches 92.6% within 90min, the photocatalyst is magneticallyrecycled under an external magnetic field, and the degradation rate of rhodamine B is 86.9% after the photocatalyst is repeatedly used five times. The product prepared by the method can be widely applied to the field of photocatalytic degradation of organic pollutants.

Description

Technical field [0001] The invention relates to a preparation of magnetic zinc cadmium sulfide composite photocatalyst (Mn x Zn 1-x Fe 2 O 4 / C / Zn 0.8 Cd 0.2 The method S) belongs to the technical field of inorganic environmental photocatalysts. Background technique [0002] CdS photocatalyst has excellent photosensitivity and visible light absorption characteristics, with a direct band gap of 2.4eV, suitable for absorbing sunlight, and is widely used due to its excellent photocatalytic performance. However, a single CdS is not photostable, and photocorrosion will occur during the photocatalysis process. At present, in order to overcome this defect, various methods have been studied, such as compounding with other semiconductors and polymers to form a heterojunction, supporting precious metals on the surface, doping with Zn and Mn plasma to form a solid solution. Solid solution Zn 0.8 Cd 0.2 S has excellent photocatalytic activity, and many researchers are devoted to Zn 0.8 Cd 0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J23/889B01J37/03B01J37/10C02F1/30
CPCB01J27/04B01J23/8892B01J23/002B01J37/031B01J37/10C02F1/30B01J2523/00C02F2305/10C02F2101/308B01J35/33B01J35/39B01J2523/27B01J2523/72B01J2523/842
Inventor 郝宇吴廷增成勇徐龙君
Owner CHONGQING VOCATIONAL INST OF ENG
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