All-solid silver iodide/carbon nitride/bismuth tungstate double z-type ternary heterojunction photocatalyst and its preparation method and application

A photocatalyst and carbon nitride technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of poor photocatalytic activity, low photogenerated electron-hole separation rate, and light absorption ability. Poor and other problems, to achieve the effect of high photocatalytic activity, good use value and application prospect, and strong redox ability

Active Publication Date: 2020-10-27
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the all-solid-state Z-type photocatalytic material has higher redox performance than traditional heterojunction materials, the material still has defects such as poor light absorption ability, low photogenerated electron-hole separation rate, and poor photocatalytic activity. insufficient

Method used

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  • All-solid silver iodide/carbon nitride/bismuth tungstate double z-type ternary heterojunction photocatalyst and its preparation method and application
  • All-solid silver iodide/carbon nitride/bismuth tungstate double z-type ternary heterojunction photocatalyst and its preparation method and application
  • All-solid silver iodide/carbon nitride/bismuth tungstate double z-type ternary heterojunction photocatalyst and its preparation method and application

Examples

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Effect test

Embodiment 1

[0050] An all-solid silver iodide / carbon nitride / bismuth tungstate double Z-type ternary heterojunction photocatalyst, including bismuth tungstate and carbon nitride, wherein bismuth tungstate and carbon nitride are combined to form carbon nitride / bismuth tungstate A heterojunction material, and the surface of the carbon nitride / bismuth tungstate heterojunction material is modified with silver iodide nanoparticles.

[0051] In this embodiment, the mass ratio of bismuth tungstate, carbon nitride, and silver iodide nanoparticles in the all-solid silver iodide / carbon nitride / bismuth tungstate double Z-type ternary heterojunction photocatalyst is 1:0.6:0.2.

[0052] In this example, bismuth tungstate has a microspherical structure with a diameter of 3 μm to 5 μm; carbon nitride is a sheet structure, stacked by smooth two-dimensional nanosheets, with a thickness of 1 nm to 3 nm; the diameter of silver iodide nanoparticles is 200nm ~ 400nm.

[0053] A preparation method of the all-...

Embodiment 2

[0083] Application of an all-solid silver iodide / carbon nitride / bismuth tungstate double Z-type ternary heterojunction photocatalyst in the degradation of antibiotics, specifically using all-solid silver iodide / carbon nitride / bismuth tungstate double Z-type ternary heterojunction The degradation of tetracycline in the water body by the photocatalyst of mass junction includes the following steps:

[0084] Take by weighing the all-solid silver iodide / carbon nitride / bismuth tungstate double Z-type ternary heterojunction photocatalyst (AgI / g-C 3 N 4 / Bi 2 WO 6 ), carbon nitride / bismuth tungstate heterojunction materials (g-C 3 N 4 / Bi 2 WO 6 ), bismuth tungstate (Bi 2 WO 6 ), the carbon nitride (g-C) made in Comparative Example 2 3 N 4 ), silver iodide (AgI) made in comparative example 3 and silver iodide / bismuth tungstate (AgI / Bi 2 WO 6 ), each 0.03g, were added to 100mL tetracycline wastewater with a concentration of 20mg / L, mixed evenly, and oscillated and adsorbed ...

Embodiment 3

[0089]Investigate the reusability of the all-solid silver iodide / carbon nitride / bismuth tungstate double Z-type ternary heterojunction photocatalyst of the present invention, comprising the following steps:

[0090] (1) After the photocatalytic reaction in Example 2 is completed, collect all-solid silver iodide / carbon nitride / bismuth tungstate double Z-type ternary heterojunction photocatalyst, wash, dry, obtain regenerated all-solid silver iodide / nitride Carbon / bismuth tungstate double Z-type ternary heterojunction photocatalyst.

[0091] (2) Weigh 0.03g of the regenerated all-solid silver iodide / carbon nitride / bismuth tungstate double Z-type ternary heterojunction photocatalyst obtained in step (1), and add it to 100mL of tetracycline wastewater with a concentration of 20mg / L , mixed evenly, oscillating and adsorbing for 30 minutes in the dark, and after reaching the equilibrium of adsorption and analysis, the photocatalytic degradation reaction was carried out under the irr...

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Abstract

The invention discloses an all-solid-state silver iodide / carbon nitride / bismuth tungstate double-Z type ternary heterojunction photocatalyst and a preparation method and application thereof. The photocatalyst is characterized in that bismuth tungstate and carbon nitride are compounded to form the carbon nitride / bismuth tungstate heterojunction material, and the surface is modified with silver iodide nanoparticles. The preparation method comprises the following steps of preparing the carbon nitride / bismuth tungstate heterojunction material, mixing with ultra-pure water, preparing mixed liquid of the carbon nitride / bismuth tungstate heterojunction material mixture, mixing with silver nitrate, and adding a potassium iodide solution to precipitate, so as to obtain the photocatalyst. The photocatalyst has the advantages that the photogenic carrier migration and separation efficiency is high, the light absorption ability is strong, the oxidation reduction ability is strong, the photocatalysis activity is high, the reusability is good, and the like. The preparation technology has the advantages that the technology is simple, the reaction conditions are controllable, the cost is low, the green and environment-friendly effects are realized, and the like. The photocatalyst has the advantages that the antibiotics can be degraded at high efficiency, the actual application requirements canbe met, and the application value and application prospect are higher.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to an all-solid silver iodide / carbon nitride / bismuth tungstate double Z-type ternary heterojunction photocatalyst and its preparation method and application. Background technique [0002] With the development of modern industry, the problem of energy crisis and environmental pollution is becoming more and more serious. Therefore, the utilization of new energy and environmental pollution control are of great significance to the national sustainable development strategy. Due to the advantages of low cost, no pollution and high efficiency, photocatalytic technology has broad application prospects in energy storage, conversion and environmental protection. [0003] Bismuth tungstate (Bi 2 WO 6 ) is a photocatalytic material with visible light response, which is widely used in the field of photocatalytic technology because of its suitable band gap, high photostability, uniqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCB01J27/24B01J35/004C02F1/30C02F2101/30C02F2305/10
Inventor 薛文静黄丹莲曾光明李婧邓锐文晓凤杨洋陈莎李博
Owner HUNAN UNIV
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