Zinc cadmium sulfur-bismuth doped indianite composite photocatalyst and preparation method thereof

A composite light and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as agglomeration of zinc, cadmium, and sulfur nanocrystals, and achieve rich resources, simple pretreatment methods, and excellent The effect of catalytic performance

Active Publication Date: 2019-12-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above modification methods all use natural silicate as the carrier, and do not make halloysite participate in the photocatalytic reaction as a photocatalyst, and at the same time, there is agglomeration phenomenon in the preparation of a single zinc cadmium sulfur nanocrystal

Method used

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  • Zinc cadmium sulfur-bismuth doped indianite composite photocatalyst and preparation method thereof
  • Zinc cadmium sulfur-bismuth doped indianite composite photocatalyst and preparation method thereof
  • Zinc cadmium sulfur-bismuth doped indianite composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the first step, 1.5mmol halloysite (258g / mol) was mixed with saturated aluminum chloride solution, ultrasonically dispersed for 10min, and then stirred on a magnetic stirrer for 0.5h;

[0030] In the second step, weigh 0.3 mmol of bismuth nitrate pentahydrate (1:5 molar ratio to halloysite) and disperse it in 5 mL of ethylene glycol solution for 10 min;

[0031] In the third step, the solution obtained in the second step is added dropwise to the suspension obtained in the first step and transferred to a 100mL polytetrafluoroethylene reactor, and taken out after solvent heating in an oven at 180°C for 24 hours;

[0032] In the fourth step, the sample obtained in the third step was washed by centrifugation, and dried in an oven at 60° C. for 12 hours to prepare a modified bismuth-doped halloysite nanomaterial.

[0033] figure 2 It is the optical picture of the unmodified halloysite nanotube (A) prepared in Example 1 and the halloysite (B) after bismuth doping. It ca...

Embodiment 2

[0035] The first step is to disperse 100mg of bismuth-doped halloysite in 50mL of deionized water, and ultrasonically disperse for more than 30min;

[0036] In the second step, quantitatively add 0.8 mmol cadmium acetate dihydrate and 0.2 mmol zinc acetate dihydrate (molar ratio 8:2) to the solution obtained in the first step, and ultrasonically stir for more than 1 hour;

[0037] In the third step, 1 mmol thioacetamide was added to the solution obtained in the second step, and ultrasonically mechanically stirred for 2 h;

[0038]In the fourth step, the samples obtained in the third step were washed by centrifugation, and dried in an oven at 60° C. for 12 hours to obtain a zinc cadmium sulfur-bismuth doped halloysite composite material (named ZCS / Bi-HNT-1).

Embodiment 3

[0040] In the first step, 20 mg of zinc cadmium sulfur-bismuth doped halloysite was dispersed in 50 mL of 10 mg / L rhodamine B solution, and stirred in a dark room for 1 h;

[0041] In the second step, the suspension obtained in the first step is placed under a 300W xenon lamp (λ>420nm) for light, with 3 mL of liquid at intervals of 10 minutes;

[0042] In the third step, the liquid sample obtained in the second step is centrifuged at 9000r / min for 1min to remove the catalyst;

[0043] In the fourth step, the centrifuged liquid obtained in the third step is detected in an ultraviolet-visible spectrophotometer to evaluate the photocatalytic performance.

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Abstract

The invention discloses a zinc cadmium sulfur-bismuth doped indianite composite photocatalyst and a preparation method thereof. In the zinc cadmium sulfur-bismuth doped indianite composite photocatalyst, indianite is of a nanotube structure, and zinc cadmium sulfur is grown on the surface of the bismuth doped indianite in a dispersion manner. The modified bismuth doped indianite is prepared by using a one-step solvent thermal method, and is subjected to ultrasonic compounding with zinc cadmium sulfur to form the composite photocatalyst. The zinc cadmium sulfur-bismuth doped indianite compositephotocatalyst disclosed by the invention is good in dispersibility and rich in active site, is adopted for photocatalysis degradation on 10mg/L of rhodamine B, has excellent catalysis properties andhas a degradation rate up to 85% or greater within 60 minutes.

Description

technical field [0001] The invention relates to a zinc cadmium sulfur-bismuth doped halloysite composite photocatalyst and a preparation method thereof, belonging to the technical field of nanometer material preparation. Background technique [0002] Photocatalytic technology uses the unique photoelectric and electrical conversion characteristics of materials to convert solar energy into chemical energy, obtain energy substances such as hydrogen and hydrocarbons, and remove pollutants and bacteria. However, the existing photocatalysts have limited their applications due to factors such as low light utilization efficiency, high recombination rate of photogenerated electrons, and few surface active sites. The photocatalytic performance can be improved by modifying the photocatalyst. The modification methods include noble metal doping, semiconductor recombination, introducing defects or heteroatoms, adding photosensitizers, etc. [0003] Halloysite is a natural clay-like silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30C02F101/30
CPCB01J27/04B01J35/004C02F1/30C02F2305/10C02F2101/308
Inventor 刘孝恒张敏
Owner NANJING UNIV OF SCI & TECH
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