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Nano-mesoporous micro-spherical Ln-Bi5O7I photocatalyst and preparation method thereof

A nano-mesoporous, photocatalyst technology, applied in the field of photocatalytic material research, can solve the problems of small specific surface area of ​​sheet-like structure, and achieve the effects of good photocatalytic performance, simple process flow and improved photocatalytic activity

Inactive Publication Date: 2016-06-15
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there is also mesoporous structure Bi 5 o 7 I, but the sheet-like structure it generates has disadvantages such as small specific surface area. Therefore, it is necessary to explore a Bi that is simple to operate, short in reaction time, large in specific surface area, uniform in shape, and can be successfully doped with rare earth ions. 5 o 7 I, and effectively improve the photocatalytic activity, which has important theoretical and practical significance

Method used

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  • Nano-mesoporous micro-spherical Ln-Bi5O7I photocatalyst and preparation method thereof
  • Nano-mesoporous micro-spherical Ln-Bi5O7I photocatalyst and preparation method thereof
  • Nano-mesoporous micro-spherical Ln-Bi5O7I photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Put 3mmol KI in 20mL ethylene glycol solution, oscillate at 80Hz for 30min until it is completely dissolved, and prepare iodine salt solution A; 2.7645mmolBi(NO 3 ) 3 ·5H 2 O and 0.0855mmolEu(NO 3 ) 3 ·6H 2 O was placed in 30mL and 2mL ethylene glycol solutions respectively, oscillated at 80Hz for 30min until it was completely dissolved, and prepared into bismuth salt solution B and Eu salt solution C.

[0028](2) Add Eu salt solution C to bismuth salt solution B, stir magnetically for 30 minutes until it completely dissolves to obtain BC mixed solution, add iodine salt solution A dropwise to BC mixed solution, wherein A, B and C The volume ratio is 1:1.5:0.05, n Bi+Eu :n I =0.95:1,n Eu :n Bi =0.03:1, magnetically stirred for 60 min to prepare the precursor Eu-BiOI solution.

[0029] (3) Put the precursor Eu-BiOI solution into a polytetrafluoroethylene reactor with a filling ratio of 65%, place the reactor in a constant temperature heating box, set the reac...

Embodiment 2

[0034] (1) Put KI in ethylene glycol solution, 70Hz ultrasonic vibration for 25min, until it is completely dissolved, and prepare iodine salt solution A with a concentration of 0.16mol / L; Bi(NO 3 ) 3 ·5H 2 O and Er(NO 3 ) 3 ·6H 2 O was respectively placed in 30mL and 4mL ethylene glycol solutions, 80Hz ultrasonic vibration for 30min, until it was completely dissolved, and prepared into 0.1mol / L bismuth salt solution B and 0.03mol / L Er salt solution C;

[0035] (2) Add Er salt solution C to bismuth salt solution B, stir magnetically for 35 minutes until it is completely dissolved to obtain BC mixed solution, and add iodine salt solution A dropwise to BC mixed solution, wherein A, B and C The volume ratio is 1:1.5:0.2, n Bi+Er :n I =0.975, n Er :n Bi =0.04, magnetically stirred for 55 minutes to prepare the precursor Er-BiOI solution.

[0036] (3) Put the precursor Er-BiOI solution into a polytetrafluoroethylene reactor with a filling ratio of 70%, place the reactor in ...

Embodiment 3

[0041] (1) Put KI in ethylene glycol solution, 70Hz ultrasonic vibration for 25min, until it is completely dissolved, and prepare iodine salt solution A with a concentration of 0.17mol / L; Bi(NO 3 ) 3 ·5H 2 O and La(NO 3 ) 3 ·6H 2 O was respectively placed in ethylene glycol solution, 100Hz ultrasonic vibration for 20min, until it was completely dissolved, and prepared into 0.095mol / L bismuth salt solution B and 0.02mol / L La salt solution C;

[0042] (2) La salt solution C was added to bismuth salt solution B, and magnetically stirred for 40 minutes until it was completely dissolved to obtain a BC mixed solution, and iodine salt solution A was added dropwise to the BC mixed solution, wherein A, B and C The volume ratio is 1:1.5:0.1, n Bi+La :n I = 0.85, n La :n Bi =0.014, magnetically stirred for 50 min to prepare the precursor La-BiOI solution.

[0043] (3) Put the precursor La-BiOI solution into a polytetrafluoroethylene reactor with a filling ratio of 68%, place the...

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Abstract

The invention provides a nano-mesoporous micro-spherical Ln-Bi5O7I photocatalyst and a preparation method thereof. The nano-mesoporous micro-spherical photocatalyst is 15-30 nm in surface mesopore diameter, is 1-5 [mu]m in average particle size and has an orthorhombic crystal form, wherein nBi + Ln : nI = 0.85-1:1, and nLn : nBi = 0.01-0.055:1. The preparation method includes the steps of: dissolving a bismuth salt, an iodine salt and nitrate containing rare earth ions respectively in certain-quantity ethylene glycol, performing ultrasonic oscillation, adding the rare earth ion solution to the bismuth-containing solution, adding the iodine-containing solution, and performing magnetic stirring to form a precursor Ln-BiOI; performing a hydrothermal reaction to the precursor to prepare Ln-BiOI powder; and maintaining the temperature of the Ln-BiOI at 425-525 DEG C to prepare the Ln-Bi5O7I powder. The Ln-Bi5O7I photocatalyst has homogeneous appearance, has large specific surface area, is strong in stability and has excellent photocatalytic performance in degradation of rhodamine B, methyl orange, phenol, bisphenol A and the like. The method combines advantages of both hydrothermal and thermal-decomposition methods.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials research, and specifically designs a kind of 3+ 、Er 3+ , La 3+ 、Nd 3+ ) of nano-mesoporous microspheres Ln-Bi 5 o 7 I photocatalyst and hydrothermal-pyrolysis preparation method thereof. Background technique [0002] In recent years, various toxic and harmful synthetic dyes, such as rhodamine B, methylene blue and methyl orange, have been widely used in textile, printing, dyeing and food industries. Serious pollution, and a threat to human health. Due to its low energy consumption, mild purification conditions, and no secondary pollution, photocatalytic technology has attracted the attention of many researchers. Therefore, many semiconductor photocatalytic materials have been widely developed and utilized in the degradation and mineralization of organic dyes. But there are still many other pollutants, such as bisphenol A, phenol, dichlorophenol, etc., due to their unique m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J35/08
CPCB01J27/06B01J35/51B01J35/39
Inventor 朱刚强张亚飞高健智韩娟利赵浩然
Owner SHAANXI NORMAL UNIV
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