Photocatalyst and application thereof in environmentally friendly photocatalytic treatment of power battery

Patent metadata

Field	Value
Publication number	US-2023191371-A1
Application number	US-202118003314-A
Country	US
Kind code	A1
Filing date	Apr 30, 2021
Priority date	Jun 24, 2020
Publication date	Jun 22, 2023
Grant date	—

Abstract

Disclosed are a photocatalyst and application thereof in environmentally friendly photocatalytic treatment of a power battery. The photocatalyst is obtained by loading Ag-TaON on a hollow glass microsphere, wherein a mass ratio of the Ag-TaON to the hollow glass microsphere is 1: 5 to 10. According to the invention, the Ag-TaON and the hollow glass microsphere are compounded, the hollow glass microsphere has better light permeability, which avoids mutual shielding between catalysts, such that the photocatalyst filled in a reactor is fully excited, which is capable of effectively improving a light utilization rate, thus improving the catalytic conversion efficiency of the photocatalyst.

First claim

1 . A photocatalyst, wherein the photocatalyst is obtained by loading Ag-TaON on a hollow glass microsphere; and a mass ratio of the Ag-TaON to the hollow glass microsphere is 1: (5 to 10):
wherein the photocatalyst is prepared by the following steps of:
(1) grinding TaON into powder, dispersing the powder in a solvent, adding a soluble silver salt, stirring, irradiating, centrifuging and washing to obtain a Ag-TaON catalyst; and
(2) dispersing the Ag-TaON catalyst in a sodium tripolyphosphate solution, adding the hollow glass microsphere, stirring and sintering to obtain the photocatalyst with Ag-TaON loaded on the hollow glass microsphere.

2 . The photocatalyst of claim 1 , wherein the hollow glass microsphere has a particle size ranging from 10 µm to 10 mm.

3 . (canceled)

4 . The photocatalyst of claim 1 , wherein in step (1), the solvent is water and methanol; a mass ratio of the TaON to the water to the methanol is 1: (20 to 60): (15 to 40); and the soluble silver salt is a AgNO 3 solution.

5 . The photocaialyst of claim 1 , wherein in step (2), the sintering is carried out at a temperature of 200° C. to 300° C. in a nitrogen atmosphere, and lasts for 1 hour to 2 hours.

6 . The photocatalyst of claim 1 , wherein the TaON is prepared by the following steps:
(1) pretreating a tantalum foil; (2) cooling, introducing an inert gas, then introducing reaction gas A, raising a temperature, keeping the temperature and reacting to obtain Ta 2 O 5 ; and (3) cooling, introducing an inert gas, then introducing reaction gas B, raising the temperature, keeping the temperature and reacting to obtain TaON, wherein in step (2), the reaction gas A is a mixed gas of O 2 and N 2 ; and the reaction gas B in step (3) is a mixed gas of NH 3 and N 2 .

7 . The photocatalyst of claim 1 wherein the pretreating of step (1) comprises pushing a corundum porcelain boat containing the tantalum foil into a middle heating section of a tube furnace, sealing with a flange, and introducing an inert gas at a flow rate of 2 mL·min -1 to 30 mL·min -1 for 20 minutes to 120 minutes at ambient temperature; and then, switching to another gas channel to introduce a pretreatment gas at a flow rate of 2 mL·min -1 to 30 mL·min -1 , then raising the temperature to 250° C. to 350° C. at a rate of 2° C.·min -1 to 8° C.·min -1 , and keeping the temperature for 30 minutes to 150 minutes, wherein the pretreatment gas is a mixed gas of H 2 and N 2 .

8 . The photocatalyst of claim 5 ,
wherein in step (2) and step (3), the inert gas is at least one selected from the group consisting of pure N 2 , Ar, and He.

9 . An environmentally friendly photocatalytic treatment method of a power battery, comprising:
(1) disassembling and pyrolyzing a waste lithium battery to obtain a gas mixed with an electrolyte; and (2) introducing the gas mixed with the electrolyte into a cleaning liquid, then introducing the gas mixed with the electrolyte into a reactor filled with the photocatalyst according to claim 1 , and irradiating with a light source for photocatalysis to degrade the electrolyte into CO 2 and H 2 O.

10 . The environmentally friendly photocatalytic treatment method of the power battery of claim 9 , wherein the cleaning liquid is at least one selected from the group consisting of NaOH, Ca(OH) 2 , and KOH.

Assignees

• Guangdong Brunp Recycling Technology Co Ltd
• Hunan Brunp Recycling Tech Co Ltd
• Hunan Brunp Ev Recycling Co Ltd

Inventors

• Yu Haijun
• Peng Ting
• Xie Yinghao
• Zhang Xuemei

Classifications

• B01J37/341

  making use of electric or magnetic fields, wave energy or particle radiation (use of flames, plasma or lasers B01J37/349) · CPC title

• B01J37/14

  with gases containing free oxygen · CPC title

• B01J35/023

  Operations & Transport · mapped topic

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J23/50 Primary

  Silver · CPC title