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Heterostructure photocatalyst for enhancing visible light response and preparation method thereof

A photocatalyst and heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve problems such as affecting visible light absorption, reduce recombination rate, improve stability, and improve photocatalytic activity. Effect

Inactive Publication Date: 2020-08-18
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that BiOCl has a wide band gap in the prior art, which affects the absorption of visible light

Method used

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  • Heterostructure photocatalyst for enhancing visible light response and preparation method thereof
  • Heterostructure photocatalyst for enhancing visible light response and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) White CaBi 2 o 4 Preparation of powder materials. Weigh 1.3573gCa(NO 3 ) 2 4H 2 O and 5.5844gBi(NO 3 ) 3 ·5H 2 O, Ca(NO 3 ) 2 4H 2 O was dissolved in 50mL deionized water to make a transparent solution, and then Bi(NO 3 ) 3 ·5H 2 O was dissolved in 50mL of dilute nitric acid solution just prepared, put the above two transparent solutions into a 200mL beaker and mix them, and stir for 30min to make them evenly mixed. Take a 500mL beaker, add 100mL deionized water as the bottom solution, mix the solution with 3mol / L ammonia water (NH 3 ·H 2 O) The two solutions are titrated together in the bottom solution, while stirring continuously to mix the precipitation reactants evenly, so that the pH of the reaction solution is kept at about 8, and the precipitation suspension obtained after the titration is completed is continued to stir and age for 30 minutes. Then use a centrifuge to separate the solid from the liquid, and wash the resulting white precipitate ...

Embodiment 2

[0021] (1) White CaBi 2 o 4 Preparation of powder materials. Weigh 1.3566gCa(NO 3 ) 2 4H 2 O and 5.5812gBi(NO 3 ) 3 ·5H 2 O, Ca(NO 3 )2 4H 2 O was dissolved in 50mL deionized water to make a transparent solution, and then Bi(NO 3 ) 3 ·5H 2 O was dissolved in 50mL of dilute nitric acid solution just prepared, put the above two transparent solutions into a 200mL beaker and mix them, and stir for 30min to make them evenly mixed. Take a 500mL beaker, add 100mL deionized water as the bottom solution, mix the solution with 3mol / L ammonia water (NH 3 ·H 2 O) The two solutions are titrated together in the bottom solution, while stirring continuously to mix the precipitation reactants evenly, so that the pH of the reaction solution is kept at about 8, and the precipitation suspension obtained after the titration is completed is continued to stir and age for 30 minutes. Then use a centrifuge to separate the solid from the liquid, and wash the resulting white precipitate wi...

Embodiment 3

[0025] (1) White CaBi 2 o 4 Preparation of powder materials. Weigh 1.3530g Ca(NO 3 ) 2 4H 2 O and 5.5856gBi(NO 3 ) 3 ·5H 2 O, Ca(NO 3 ) 2 4H 2 O was dissolved in 50mL deionized water to make a transparent solution, and then Bi(NO 3 ) 3 ·5H 2 O was dissolved in 50mL of dilute nitric acid solution just prepared, put the above two transparent solutions into a 200mL beaker and mix them, and stir for 30min to make them evenly mixed. Take a 500mL beaker, add 100mL deionized water as the bottom solution, mix the solution with 3mol / L ammonia water (NH 3 ·H 2 O) The two solutions are titrated together in the bottom solution, while stirring continuously to mix the precipitation reactants evenly, so that the pH of the reaction solution is kept at about 8, and the precipitation suspension obtained after the titration is completed is continued to stir and age for 30 minutes. Then use a centrifuge to separate the solid from the liquid, and wash the resulting white precipitate...

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Abstract

The invention discloses a CaBi2O4 / BiOCl heterojunction composite photocatalyst and a preparation method thereof, and belongs to the technical field of photocatalytic materials. The preparation methodcomprises the following steps: dissolving calcium nitrate tetrahydrate in deionized water, dissolving barium nitrate pentahydrate in dilute nitric acid, and uniformly mixing the calcium nitrate tetrahydrate and barium nitrate pentahydrate; dropwise adding dilute ammonia water and the mixed solution into deionized water at the same time, and continuously stirring until the pH value is 6-8 to obtainwhite turbid liquid; stirring and aging the obtained precipitate suspension for 30 minutes, carrying out solid-liquid separation by using a centrifugal machine to obtain a white precipitate, washing,diluting, putting into a reaction kettle, carrying out heating treatment at 180-260 DEG C for 6 hours, and cooling and drying to obtain calcium bismuthate; roasting Calcium bismuthate for 4 h, and then adding absolute ethyl alcohol and deionized water for ultrasonic treatment; and adding hydrochloric acid with required volume according to different molar fractions, stirring, filtering, washing and drying to obtain a series of CaBi2O4 / BiOCl heterojunction photocatalysts with different BiOCl contents. The method has the characteristics that the preparation temperature is low, the process is simple, the absorption of the prepared CaBi2O4 / BiOCl heterojunction photocatalyst to visible light is enhanced, and the degradation performance to rhodamine B is also obviously superior to that of CaBi2O4.

Description

technical field [0001] The invention relates to the technical field of preparation of a novel photocatalyst, in particular to a method for synthesizing CaBi by using calcium nitrate tetrahydrate, bismuth nitrate pentahydrate, ammonia water, dilute nitric acid and deionized water as raw materials. 2 o 4 / BiOCl heterojunction composite photocatalyst method. Background technique [0002] The use of semiconductor photocatalytic technology to degrade organic pollutants has attracted more and more attention because of its energy saving and high efficiency. Among them, TiO 2 Due to the advantages of non-toxicity, low cost and easy availability, and good thermal stability, it has attracted great interest in the early research of heterogeneous photocatalysis. But TiO 2 The bandgap width is large, and the utilization rate of visible light is low; in addition, TiO 2 The high recombination rate of photogenerated carriers also leads to the decrease of its photocatalytic efficiency. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138C01G29/00
CPCB01J27/138C01G29/00C01P2004/80B01J35/39
Inventor 李文强陈宁宁詹美玲张铎黄朝晖
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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