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A kind of micro-nano heterojunction visible light composite photocatalyst and its preparation method and application

A heterojunction, visible light technology, applied in the field of photocatalysis, can solve the problems of photocorrosion, easy photocatalyst, poor stability, etc., and achieve the effect of strong photocorrosion resistance, good photocatalytic performance, and high visible light absorption intensity.

Inactive Publication Date: 2019-07-09
FOSHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a micro-nano heterojunction visible light composite photocatalyst and its preparation method and application, aiming at solving the problem of existing Ag 3 PO 4 Photocatalysts are prone to photocorrosion and poor stability, and further strengthen Ag on this basis 3 PO 4 The visible light absorption intensity and photocatalytic activity of

Method used

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  • A kind of micro-nano heterojunction visible light composite photocatalyst and its preparation method and application
  • A kind of micro-nano heterojunction visible light composite photocatalyst and its preparation method and application
  • A kind of micro-nano heterojunction visible light composite photocatalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0048] Preparation of micro-nano heterojunction visible light composite photocatalyst:

[0049] (1) First, CuBi with uniform morphology and structure was prepared by hydrothermal method 2 o 4 , that is, 0.04 mole parts of Bi(NO 3 ) 3 ·5H 2 O dissolved in 3 mL concentrated HNO 3 , stirred to dissolve completely, and then added 20 mL of 0.02 molar parts of Cu(NO 3 ) 2 ·3H 2 O, stir to make it evenly mixed, then dropwise add 20 mL of 1.2 mol / L NaOH, and dilute the dropwise mixed solution to 70 mL, continue stirring for 1 h, then transfer the mixed solution to a high-pressure reactor In the process, the temperature was raised to 100 °C, and the reaction was carried out for 24 h. After the reaction kettle was naturally cooled to room temperature, the precipitate obtained in the reaction was washed with ultrapure water repeatedly and ultrasonically, and centrifuged at a speed of 6000 r / min. Dry in a vacuum oven at 60°C for 12 h, grind and pass through an 80-mesh sieve to obt...

Embodiment 2

[0053] Preparation of micro-nano heterojunction visible light composite photocatalyst:

[0054] (1), CuBi 2 o 4 The preparation is the same as in Example 1.

[0055] (2), further using the in-situ precipitation method to prepare micro-nano heterojunction CuBi 2 o 4 / Ag 3 PO 4 , that is, accurately weigh 0.2 mmol of CuBi prepared in step (1) 2 o 4 Disperse in 40 mL of ultrapure water, and sonicate for 30 min, then add 10 mL of aqueous solution dissolved with 0.72 mmol sodium stearate additive, stir magnetically for 2 h, then add 10 mL of AgNO dissolved with 0.72 mmol dropwise 3 solution, continue to stir for 30 min, and finally add 20 mL of Na dissolved with 0.24 mmol dropwise 2 HPO 4 12H 2 O solution, stirred for 1.5 h, centrifuged at 6000 r / min to recover the solid precipitate, and the solid precipitate was repeatedly ultrasonically washed with absolute ethanol and ultrapure water, and then dried in a vacuum oven at 60 °C 12 h, grind and pass through 80 mesh sieve ...

Embodiment 3

[0058] Preparation of micro-nano heterojunction visible light composite photocatalyst:

[0059] (1), CuBi 2 o 4 The preparation is the same as in Example 1.

[0060] (2), further using the in-situ precipitation method to prepare micro-nano heterojunction CuBi 2 o 4 / Ag 3 PO 4 , that is, accurately weigh 0.2 mmol of CuBi prepared in step (1) 2 o 4Disperse in 40 mL of ultrapure water, and sonicate for 30 min, then add 10 mL of aqueous solution dissolved with 0.72 mmol of sodium citrate additive, stir magnetically for 2 h, then add 10 mL of dissolved AgNO with 0.72 mmol dropwise 3 solution, continue to stir for 30 min, and finally add 20 mL of Na dissolved in 0.24 mmol dropwise 2 HPO 4 12H 2 O solution, stirred for 1.5 h, centrifuged at 6000 r / min to recover the solid precipitate, and the solid precipitate was repeatedly ultrasonically washed with absolute ethanol and ultrapure water, and then dried in a vacuum oven at 60 °C 12 h, grind and pass through 80 mesh sieve t...

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Abstract

A micro-nano heterojunction visible light composite photocatalyst and its preparation method and application of the present invention. The micro-nano heterojunction visible light composite photocatalyst is CuBi 2 O 4 / Ag 3 PO 4 , CuBi in the micro-nano heterojunction visible light composite photocatalyst 2 O 4 For micron structure, Ag 3 PO 4 is a nanostructure, and CuBi 2 O 4 with Ag 3 PO 4 Close contact forms a heterojunction. Compared to pure Ag 3 PO 4 , the micro-nano heterojunction visible light composite photocatalysts prepared by the present invention all have the advantages of high visible light absorption intensity, good photocatalytic performance, and strong resistance to photocorrosion. 0.5 g of CuBi prepared with sodium stearate as additive 2 O 4 / Ag 3 PO 4 (1:1, wt%) was used to treat diclofenac refractory organic wastewater. The removal rate of 1 L 10 mg / L diclofenac solution reached 88.73% in 240 minutes. After being reused for the fifth time, the removal rate of diclofenac solution was 73.69%.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a micro-nano heterojunction visible light composite photocatalyst and its preparation method and application. Background technique [0002] In recent years, the continuous development of the economy and society and the continuous deepening of the industrialization process have led to the discharge of a large number of emerging organic pollutants in wastewater, but the current municipal sewage treatment system is difficult to completely remove them, resulting in these emerging organic pollutants in surface water, groundwater , and even in drinking water systems. And these emerging organic pollutants, such as diclofenac, etc., even at trace concentrations, will be seriously harmed if humans, animals and plants are exposed to them for a long time. Therefore, the removal of emerging organic pollutants in wastewater is still the focus and difficulty in the field of environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J23/843C02F1/30C02F1/70C02F1/72
CPCC02F1/30C02F1/70C02F1/725B01J23/50B01J23/8437C02F2305/10B01J35/394B01J35/39Y02W10/37
Inventor 陈晓娟徐颂王海龙陈忻陈美纶
Owner FOSHAN UNIVERSITY
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