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P and S codoped carbon nitride homotype heterojunction composite photocatalyst

A technology of homo-heterojunction and photocatalyst is applied in the field of photocatalytic materials to achieve the effect of improving photocatalytic efficiency, simple preparation method and rapid separation

Inactive Publication Date: 2020-03-13
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the one-step construction of co-doped and homo-heterojunction composites to optimize the photocatalytic efficiency of graphitic carbonitrides

Method used

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  • P and S codoped carbon nitride homotype heterojunction composite photocatalyst
  • P and S codoped carbon nitride homotype heterojunction composite photocatalyst
  • P and S codoped carbon nitride homotype heterojunction composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Synthesis of P, S co-doped g-C 3 N 4 Homogenous junction

[0027] Grind 2g of thiourea, 1g of thiocyanuric acid and 0.2g of hexachlorocyclotriphosphazene (HCCP) into a powder mixture and put it in a covered ceramic crucible. The mixture is calcined at 550°C for 3h, set The heating rate is 8°C min -1 . After the reaction product is cooled to room temperature, it is ground into powder to obtain P, S-codoped homogeneous heterojunction g-C 3 N 4 . The P, S co-doped g-C 3 N 4 Recorded as PSCN.

Embodiment 2

[0034] Embodiment 2 field emission transmission electron microscope (FETEM) test

[0035] Field emission transmission electron microscopy (FETEM) analysis was performed using a Tecnai G2 F30 S-TWIN (FEI, USA) with an accelerating voltage of 300 kV. figure 1 TEM photographs for the elemental maps of SCN-1 and PSCN, from figure 1 It can be seen in (a) that SCN-1 exhibits obvious agglomeration phenomenon, which is due to the uneven heat and mass transfer during thiourea calcination at high temperature. Instead, from figure 1 As can be seen in (b–d), the PSCN has an obvious hierarchical structure and the agglomeration phenomenon is also suppressed. Such as figure 1 (e–k) Shown are the element distribution maps in PSCN samples, and all key elements (C, N, O, P, and S) are uniformly distributed in PSCN in a consistent distribution manner.

Embodiment 3

[0036] Embodiment 3 XRD test

[0037] The crystal structures of SCN-1, SCN-2, SCN-H and PSCN were analyzed by X-ray powder diffractometer. figure 2 (a) is the XRD pattern of SCN-1, SCN-2, SCN-H and P, S co-doped homoheterojunction composite (PSCN). From figure 2 As can be seen in (a), SCN-1, SCN-2, SCN-H, and PSCN all show two distinct characteristic diffraction peaks (002) and (100) attributed to graphitic carbonitrides, which indicate that by The structure of the material formed by S doping and the homo-heterojunction composite material formed by copolymerization did not change significantly. At the same time, it can be observed that the structure of SCN-2 obtained only by calcining thiocyanuric acid has obvious structural defects, and the diffraction peak of the 110 crystal plane almost disappears. according to figure 2 (b) It can be seen that the amplified (002) diffraction peaks of PSCN and SCN-H (PSCN, 27.33°; SCN-H, 27.34°) are located between SCN-1 and SCN-2, in...

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Abstract

The invention discloses a P and S codoped carbon nitride homotype heterojunction composite photocatalyst, and belongs to the technical field of photocatalytic materials. Thiourea, trithiocyanuric acidand hexachlorocyclotriphosphazene (HCCP) are used as raw materials, and are subjected to a mixing and calcining one-step process to obtain the P and S codoped g-C3N4 homotype heterojunction compositephotocatalyst. The P and S codoped g-C3N4 homotype heterojunction composite photocatalyst has excellent photocatalytic activity, the significant enhancement of the photocatalytic activity of the photocatalyst can be attributed to the formation of homotype heterojunctions and the synergistic effect of co-doping of two heteroatoms, the separation efficiency of a photo-induced carrier is improved through accelerated separation, and much visible light can be captured to generate a lot of photo-induced electron holes.

Description

technical field [0001] The invention relates to a P, S co-doped carbon nitride homogeneous heterojunction composite photocatalyst, which belongs to the technical field of photocatalytic materials. Background technique [0002] About 88% of the current world energy economy depends on fossil energy. However, the decrease of fossil energy and the deteriorating climate and environment have seriously affected the sustainable development of society and our healthy life. In addition, due to chemical dyes, pesticide residues, etc. Water pollution is also a serious threat to our health. The photocatalytic technology based on nano-semiconductor materials can not only use solar energy to convert simple small molecules (such as H 2 O and CO 2 ) directly into fuel (such as H 2 、CH 4 、CH 3 OH and other high value-added chemical fuels) can also effectively degrade environmental organic pollutants, bringing hope to the solution of the above problems. However, the activity of current p...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J35/10C01B3/02
CPCB01J27/24B01J37/082B01J37/0036C01B3/02B01J35/613B01J35/39B01J35/633
Inventor 柏寄荣周品邓恩夫周全法
Owner CHANGZHOU INST OF TECH
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