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a rhpx/g-c 3 no 4 Composite photocatalyst and its preparation method and application

A composite catalyst, g-c3n4 technology, used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. The effect of improving the activity of hydrogen production from water splitting and expanding the response range of visible light

Active Publication Date: 2021-12-07
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that metal phosphides such as Ni 12 P 5 , Ni 2 P, NiP 2 , Fe 2 P, FeP, CoP, Co 2 P, Cu 3 P and MoP, etc., can be used as co-catalysts equivalent to Pt to increase g-C 3 N 4 photocatalyst-modified g-C 3 N 4 In the process of photolysis of water to produce hydrogen, the photocatalytic activity will decrease with the reaction, and its performance cannot be kept stable

Method used

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  • a rhpx/g-c <sub>3</sub> no <sub>4</sub> Composite photocatalyst and its preparation method and application
  • a rhpx/g-c <sub>3</sub> no <sub>4</sub> Composite photocatalyst and its preparation method and application
  • a rhpx/g-c <sub>3</sub> no <sub>4</sub> Composite photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: RhP x / g -C 3 N 4 -1 Preparation of photocatalyst and its photolysis of water to produce hydrogen

[0037] (1) Preparation of ultra-thin g-C 3 N 4 Nanosheets:

[0038] Weigh a certain amount of urea, dry it in an oven at 80°C overnight, then grind it into a powder form and put it into a crucible with a lid. -1 The heating rate was raised to 550°C and calcined for 4h. After naturally cooling down to room temperature, the calcined product was taken out and stirred overnight in an appropriate amount of concentrated nitric acid (pH=1), then washed several times with deionized water until the pH of the filtrate was consistent with that of deionized water, and dried thoroughly in an oven to obtain g-C 3 N 4 .

[0039] Weigh 2g g-C 3 N 4 , from room temperature to 5°C min in the muffle furnace -1 The heating rate was increased to 500 ° C, and calcined for 4 h to obtain ultra-thin g-C 3 N 4 Nanosheets.

[0040] (2) Preparation of RhP x / g -C 3 N 4 -1...

Embodiment 2

[0045] Example 2: RhP x / g -C 3 N 4 -3 Preparation of photocatalyst and its photolysis of water to produce hydrogen

[0046] Step (1) is the same as in Example 1.

[0047] (2) Preparation of RhP x / g -C 3 N 4 -3 Photocatalyst:

[0048] Weigh 0.2g ultra-thin g-C 3 N 4 , dissolved in deionized water, and ultrasonically stirred to obtain a uniformly dispersed suspension. Accurately weigh rhodium triacetylacetonate, metal Rh and ultra-thin g-C 3 The mass ratio of N is 3:100, dissolved in deionized water, at this time the metal Rh is in the ultrathin g-C 3 N 4 With a loading of 3%, rhodium triacetylacetonate solution was added dropwise to the ultrathin g-C 3 N 4 The suspension was stirred by magnetic force for 3h. Then add 0.15 mol / L NaOH solution drop by drop to the suspension, and the molar ratio of metal Rh to sodium hydroxide n(Rh):n(NaOH)=1:2, magnetic stirring for 1h, 80°C oil bath overnight .

[0049] Grind the sample dried in the oil bath to powder, mix it w...

Embodiment 3

[0052] Example 3: RhP x / g -C 3 N 4 -5 Preparation of photocatalyst and its photolysis of water for hydrogen production

[0053] Step (1) is the same as in Example 1.

[0054](2) Preparation of RhP x / g -C 3 N 4 -5 Photocatalyst:

[0055] Weigh 0.2g ultra-thin g-C 3 N 4 , dissolved in deionized water, and ultrasonically stirred to obtain a uniformly dispersed suspension. Accurately weigh rhodium triacetylacetonate, metal Rh and ultra-thin g-C 3 N 4 The mass ratio is 5:100, dissolved in deionized water, at this time the metal Rh is in the ultrathin g-C 3 N 4 With a loading of 5%, rhodium triacetylacetonate solution was added dropwise to the ultrathin g-C 3 N 4 The suspension was stirred by magnetic force for 3h. Then add a certain amount of 0.15mol / L NaOH solution drop by drop to the suspension, and the molar ratio of metal Rh to sodium hydroxide n(Rh):n(NaOH)=1:2, magnetic stirring for 1h, 80℃ oil Bath overnight.

[0056] Grind the sample dried in the oil bath...

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Abstract

The invention belongs to the technical field of nanomaterial synthesis and relates to a RhPx / g-C 3 N 4 Composite photocatalyst and its preparation method and application, in the present invention, utilize simple and rapid electrostatic drive self-assembly method and direct phosphating method x Heterogeneous Nanoparticle Loading on g‑C 3 N 4 surface, constituting different proportions of RhP x / g‑C 3 N 4 The composite photocatalyst system realizes efficient and stable photolysis of water to produce hydrogen under visible light. in g‑C 3 N 4 Ultrathin layer surface modification of RhP x , which not only provides abundant surface active sites, but also increases g‑C 3 N 4 The ability to absorb light and the separation and transport efficiency of carriers can effectively prevent the recombination of photogenerated electron-hole pairs and improve the photocatalytic activity. In addition, RhP x / g‑C 3 N 4 The composite catalyst has high stability and reusability.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial synthesis and relates to a RhP x / g -C 3 N 4 Composite photocatalyst and its preparation method and application. Background technique [0002] In recent years, semiconductor photocatalysis technology, as an efficient, safe and environmentally friendly solar energy conversion technology, has received extensive attention. Among them, hydrogen production by photolysis of water is non-toxic, non-polluting, mild reaction conditions and strong stability, and can be reused. Characteristics are considered to be one of the most potential ways to alleviate the global energy crisis. So far, although a large number of photocatalytic materials have been developed and utilized, these catalysts still have defects such as photocatalytic instability, inability to fully utilize solar energy, or toxicity to the environment. [0003] Graphite carbon nitride (g-C 3 N 4 ) is a non-metallic semiconductor mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/08C01B3/04
CPCB01J27/24B01J37/08C01B3/042B01J35/39Y02E60/36
Inventor 董红军武慧慧李春梅余晓明于思宇张海波
Owner JIANGSU UNIV
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