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Honeycomb-like oxygen-doped carbon nitride photocatalyst, preparation method and applications thereof

A carbon nitride light and oxygen doping technology, applied in the field of photocatalytic materials, can solve problems such as limitation and high energy consumption, and achieve the effects of strong practicability, improved photocatalytic performance and simple preparation process

Inactive Publication Date: 2019-11-12
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in previous research work, the pretreatment of precursors (such as pre-hydrothermal or pre-solvothermal) or additional post-treatment (such as thermal exfoliation and acid exfoliation) is a long-term, high-energy-consuming and complicated operation process, Severely limited scalable synthesis of graphitic phase carbon nitride nanostructures and subbandgap modulation

Method used

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  • Honeycomb-like oxygen-doped carbon nitride photocatalyst, preparation method and applications thereof
  • Honeycomb-like oxygen-doped carbon nitride photocatalyst, preparation method and applications thereof
  • Honeycomb-like oxygen-doped carbon nitride photocatalyst, preparation method and applications thereof

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Embodiment 1

[0025] The preparation method of the honeycomb oxygen-doped carbon nitride photocatalyst of the present embodiment comprises the following steps:

[0026] S1. After dicyandiamide and oxamide are uniformly mixed, they are fully ground in a mortar to obtain a mixture, wherein the amount of dicyandiamide is 2g, and the molar weight of oxamide accounts for 1%, 2% of the molar weight of dicyandiamide respectively. %, 3%, 4%, 5%;

[0027] S2. Put the mixture into a muffle furnace and calcine it step by step: first raise the temperature to 110°C at 1.5°C / min; then raise the temperature to 600°C at 5°C / min and keep it warm for 3 hours. After the sample is naturally cooled to room temperature, the obtained sample is collected by grinding, which is the honeycomb oxygen-doped carbon nitride (HOCN) series photocatalyst. The samples whose molar amounts of oxamide are respectively 1%, 2%, 3%, 4%, and 5% of the molar amounts of dicyandiamide are represented as HOCN1, HOCN2, HOCN3, HOCN4, an...

Embodiment 2

[0029] The preparation method of the honeycomb oxygen-doped carbon nitride photocatalyst of the present embodiment comprises the following steps:

[0030] S1. After dicyandiamide and oxamide are uniformly mixed, they are fully ground in a mortar, wherein the amount of dicyandiamide is 2g, and the amount of oxamide added is 4% of the molar amount of dicyandiamide;

[0031] S2. Put the mixture into a muffle furnace and calcine it step by step: first raise the temperature to 120°C at 1°C / min; After the sample was naturally cooled to room temperature, the obtained sample was collected by grinding, which was the honeycomb oxygen-doped carbon nitride (HOCN-1) photocatalyst.

Embodiment 3

[0033] The preparation method of the honeycomb oxygen-doped carbon nitride photocatalyst of the present embodiment comprises the following steps:

[0034] S1. After uniformly mixing dicyandiamide and oxamide, grind them thoroughly in a mortar, wherein the amount of dicyandiamide is 2g, and the amount of oxamide added is 0.01% of the molar amount of dicyandiamide;

[0035] S2. Put the mixture into a muffle furnace and calcine it step by step in stages: first raise the temperature to 90°C at 2°C / min; then raise the temperature to 500°C at 6°C / min and keep it warm for 1 hour. After the sample was naturally cooled to room temperature, the obtained sample was collected by grinding, which was the honeycomb oxygen-doped carbon nitride photocatalyst.

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Abstract

The invention discloses a honeycomb-like oxygen-doped carbon nitride photocatalyst, a preparation method and applications thereof. The preparation method comprises: S1, uniformly mixing dicyandiamideand oxamide, and completely grinding; and S2, calcining the mixture to obtain the photocatalyst. According to the present invention, dicyandiamide and oxamide are physically mixed, the mixture is graded, and one-step calcining is performed to prepare the honeycomb-like graphite phase carbon nitride with wide sub-band gap, wherein the ratio of dicyandiamide to oxamide is further optimized, and themorphology and the sub-band gap position of the photocatalyst are adjusted, such that the light absorption region is broadened and the specific surface area is increased so as to shorten the migrationdistance from the charge to the surface, provide more active sites for photocatalysis, achieve the efficient charge transfer and separation, and achieve good photocatalytic hydrogen production effect.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a honeycomb oxygen-doped carbon nitride photocatalyst and its preparation method and application. Background technique [0002] With the intensification of energy crisis and environmental pollution, hydrogen energy, as a promising renewable alternative to traditional fossil fuels, has received extensive attention, especially for hydrogen production by photocatalytic water splitting. Graphite carbon nitride is a non-metallic semiconductor material with good thermal stability, chemical stability and unique semiconductor electronic structure. However, the photocatalytic efficiency of graphitic carbon nitride is severely inhibited by factors such as easy recombination of photogenerated electron-hole pairs, limited photocatalytic activity, and insufficient response to visible light, which affects its further application in the fields of photocatalysis and environmental treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/04C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277B01J35/39B01J35/56Y02E60/36
Inventor 陈志鸿李珊珊胡春
Owner GUANGZHOU UNIVERSITY
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