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Preparation method of black phosphorus nano lamina for photocatalytic degradation of dye wastewater

A technology of nano-sheets and dye wastewater, applied in the field of nano-materials, can solve the problems of small amount of preparation by chemical vapor deposition, low yield of preparation by mechanical stripping, cumbersome operation, etc., to improve photocatalytic activity and stability, application The effect of high value and high production efficiency

Active Publication Date: 2017-04-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production yield of mechanical exfoliation method is low, it is not suitable for the production of commercially applicable materials, and the operation is cumbersome and time-consuming; while the preparation amount of chemical vapor deposition method is very small, and it is not easy to repeat

Method used

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  • Preparation method of black phosphorus nano lamina for photocatalytic degradation of dye wastewater
  • Preparation method of black phosphorus nano lamina for photocatalytic degradation of dye wastewater
  • Preparation method of black phosphorus nano lamina for photocatalytic degradation of dye wastewater

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Effect test

Embodiment 1

[0033] A method for preparing black phosphorus nanosheets for photocatalytic degradation of dye wastewater, specifically comprising the following steps:

[0034] (1) Preparation of multilayer black phosphorus:

[0035] Using red phosphorus as a template, add 2g of red phosphorus and 15mL of ultrapure water into a 25mL hydrothermal kettle and steam at 200°C for 12 hours to remove the oxide layer on the surface of red phosphorus. Then take it out and dry it, grind it with an agate mortar for 0.8h to get the multilayer black phosphorus precursor, then put the multilayer black phosphorus precursor under the protection of argon at normal temperature and pressure for mechanical ball milling, ball milling for 30h, and keep the rotation speed at 500r / min. Multi-layer black phosphorus can be obtained after mechanical ball milling.

[0036] (2) Preparation of black phosphorus nanosheets:

[0037] Add multi-layer black phosphorus and surfactant into ultrapure water at a mass ratio of...

Embodiment 2

[0044] A method for preparing black phosphorus nanosheets for photocatalytic degradation of dye wastewater, the method specifically comprising the following steps:

[0045] (1) Preparation of multilayer black phosphorus: add red phosphorus and ultrapure water into a hydrothermal kettle, add 0.1g of red phosphorus per 1mL of water, and then react at 190°C for 15h. After the reaction, take out the solid , after drying, the red phosphorus with the surface oxide layer removed is obtained; the red phosphorus with the surface oxide layer removed is placed in a mortar and ground for 0.5h to obtain a multilayer black phosphorus precursor, and then the multilayer black phosphorus precursor is rotated at a speed of 400r / Mechanical ball milling under min, and filled with argon for protection at the same time, to prevent the multi-layer black phosphorus precursor from being oxidized, after 48 hours, the multi-layer black phosphorus is obtained;

[0046] (2) Preparation of black phosphoru...

Embodiment 3

[0048] A method for preparing black phosphorus nanosheets for photocatalytic degradation of dye wastewater, the method specifically comprising the following steps:

[0049] (1) Preparation of multi-layer black phosphorus: add red phosphorus and ultrapure water into a hydrothermal kettle, add 0.2g of red phosphorus per 1mL of water, and then react at 210°C for 10h. After the reaction, take out the solid , after drying, the red phosphorus with the surface oxide layer removed is obtained; the red phosphorus with the surface oxide layer removed is placed in a mortar and ground for 1 hour to obtain a multilayer black phosphorus precursor, and then the multilayer black phosphorus precursor is heated at a speed of 600r / min Under mechanical ball milling, at the same time filled with argon for protection, to prevent the multi-layer black phosphorus precursor from being oxidized, after 24 hours, the multi-layer black phosphorus is obtained;

[0050] (2) Preparation of black phosphorus n...

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Abstract

The invention relates to a preparation method of a black phosphorus nano lamina for photocatalytic degradation of dye wastewater. The method specifically comprises the following steps: (1) preparing multilayer black phosphorus, namely grinding red phosphorus without a surface oxidation layer in a mortar, and then performing mechanical ball milling to obtain the multilayer black phosphorus; and (2) preparing the black phosphorus nano lamina, namely adding the multilayer black phosphorus and a surfactant into water together, performing primary ultrasonic treatment and primary centrifugation, then collecting supernatant, adding the supernatant into water, stirring the materials uniformly, then performing secondary ultrasonic treatment, performing secondary centrifugation to obtain a solid deposit, and drying the solid deposit to obtain the black phosphorus nano lamina. Compared with the prior art, the preparation method provided by the invention is simple in preparation process, high in preparation efficiency, and suitable for large-scale production, and the prepared black phosphorus nano lamina has a higher specific surface area and band gap and photocatalytic activity, and can be used for performing photocatalytic efficient degradation on coloring agents including methylene blue in the dye wastewater.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a method for preparing black phosphorus nanosheets used for photocatalytically degrading dye wastewater. Background technique [0002] In recent years, two-dimensional nanomaterials such as graphene and transition metal sulfides have shown extraordinary application potential in the fields of electronics, sensing and optoelectronic devices due to their excellent physical and structural properties. Among them, graphene, as the most representative two-dimensional material, has been widely studied. Graphene has ultra-high carrier mobility, but at the same time lacks a band gap, which seriously hinders its application in logic semiconductor devices such as field-effect transistors. As a representative of transition metal sulfides, molybdenum disulfide (MoS 2 ) has an obvious band gap, but the presence of structural defects will lead to a decrease in electron mobility. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/02C02F1/30B82Y40/00B82Y30/00B01J27/14B01J35/10
CPCC01B25/02C02F1/30B01J27/14C02F2101/308C02F2305/10C01P2004/24C01P2004/04C01P2002/82C01P2002/72B01J35/39B01J35/60
Inventor 徐群杰吴桐林艳刘其余克范金辰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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