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Preparation method of visible-light response iron-based photocatalyst

A photocatalyst and visible light technology, used in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of waste gas and wastewater treatment that have not been seen, and achieve improved utilization and photocatalytic reaction. The effect of efficiency, high availability, good economic and social benefits

Inactive Publication Date: 2018-09-14
江苏康润净化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, there have been no reports on visible light-responsive photocatalysts co-doped with transition metals and rare earth elements bismuth ferrite, let alone the use of this technology and materials to treat waste gas and wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] 1. Preparation of coordination precursor

[0023] A certain amount of complexing agent diethylenetriaminepentaacetic acid (H 5 DTPA) is dissolved in hot water, and hydrated nitrates of transition metal elements, rare earth elements, bismuth and iron are added according to dosage, and the transition metals are hydrated nitric acid such as chromium Cr, manganese Mn, cobalt Co, nickel Ni, copper Cu and zinc Zn A kind of salt; its rare earth element is one of hydrated nitrates such as lanthanum La, yttrium Y, cerium Ce, praseodymium Pr, neodymium Nd, samarium Sm, europium Eu, gadolinium Gd, dysprosium Dy, erbium Er and yttrium Y . The amount of nitrate addition of transition metals, rare earths, bismuth and iron is based on the final product Bi (1-x-y) T x P y FeO 3 Measurement, where T is a transition metal, P is a rare earth element, 0<x≤0.07, 0<y≤0.07.

[0024] Thoroughly stir the mixture to obtain a transparent solution, and heat the solution at 60°C to 90°C for ...

Embodiment 1

[0035] Embodiment 1: prepare Bi 0.95 Ni 0.05 Ce 0.05 FeO 3 Visible light-responsive photocatalyst, the method is as follows:

[0036] Prepare H at a concentration of 1 mmol 5 500mL of DTPA solution was stirred on a magnetic stirrer and heated to 80°C. 5 DTPA was completely dissolved. Add 0.90mmol of Bi(NO 3 ) 3 ·5H 2 O solution 250mL and 1mmol Fe(NO 3 ) 3 ·6H 2 O solution 250mL, continue to heat and keep at 80°C, and stir well to obtain a yellow-green transparent solution. Then add 0.05mmol of Ni(NO 3 ) 2 ·6H 2 O solution 250mL, 0.05mmol of Ce(NO 3 ) 2 ·6H 2 O solution 250mL, and then the solution was placed in an oven at 80°C for 5 days to form a solid coordination precursor Bi 0.90 Ni 0.05 Ce 0.05 (DTPA)Fe(NO 3 ) 3 ·nH 2 O, finally put into a porcelain crucible and burn in a muffle furnace at 500°C for 1h. After the sample was cooled to room temperature, the sample was taken out and ground to 150 mesh to obtain dark brick red Bi 0.90 Ni 0.05 Ce 0.0...

Embodiment 2

[0043] Embodiment 2: prepare Bi 0.90 Ni 0.03 Ce 0.07 FeO 3 Visible light-responsive photocatalysts.

[0044] In addition to adding 250mL of Ni(NO 3 ) 2 ·6H 2 O solution concentration is 0.03mmol, Ce(NO 3 ) 2 ·6H 2 Except that the concentration of the O solution is 0.07mmol, the concentration and amount of the other added reagents, as well as the operating steps are the same as in Example 1 above.

[0045] Phase characterization and photocatalytic performance test results of samples:

[0046] XRD test shows that the doped bismuth ferrite prepared by this method, the main phase is still hexagonal rhombic R3c phase bismuth ferrite, the crystal size is 28nm, and the composition of the product after burning is close to that of Bi 0.90 Ni 0.03 Ce 0.07 FeO 3 .

[0047] The FT-IR test shows that the precursor needs to be decomposed completely at close to 500 °C, and some characteristic peaks are due to Ni 2+ and Ce 2+ It is caused by BFO lattice distortion and crystal ...

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Abstract

The invention discloses a visible-light response iron-based photocatalyst which comprises components such as transition metal, rare earth, bismuth and iron. The molecular formula of a final product isBi(1-x-y)TxPyFeO3, wherein T refers to transition metal, P refers to rare earth elements, 0<x<=0.07, and 0<y<=0.07. By a low-temperature pyrolysis coordination precursor method, transition metal andrare earth element doped composite bismuth ferrite is rapidly prepared, and the method includes the steps of coordination precursor preparation and coordination precursor pyrolysis. Firstly, a bismuthferrite co-doped precursor is prepared, and metal and rare earth ions enter bismuth ferrite lattices. Secondly, a coordination precursor is pyrolyzed to form nano-scale composite bismuth ferrite oxide Bi(1-x-y)TxPyFeO3. The catalyst has strong paramagnetism, the color removal rate of methylene blue water solution is larger than 95% in visible light, and magnetization recovery rate reaches 90% after a sample is used.

Description

technical field [0001] The invention relates to a visible light-responsive iron-based photocatalyst and its preparation, and belongs to the technical field of inorganic non-metallic material manufacturing. Background technique [0002] At present, the use of photocatalytic technology to degrade environmental pollutants has begun to be applied, but there are several limiting factors: first, semiconductor photocatalysts mainly based on titanium dioxide, because of their wide bandgap (2.8eV), can only rely on photocatalysts below 387nm Only ultraviolet light can play a role, and sunlight cannot be used, and the cost is high; the second is that the photogenerated electrons and photogenerated holes are easy to recombine, which makes the quantum efficiency of the photocatalyst low and the decontamination ability is poor; the third is the prepared powder photocatalyst It is difficult to recycle in wastewater and waste gas treatment, which limits its application. [0003] Bismuth f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/83B01J23/86B01J23/887B01J23/889C02F1/30
CPCC02F1/30B01J23/002B01J23/83B01J23/862B01J23/8871B01J23/8892C02F2305/10B01J2523/00B01J35/33B01J35/39B01J2523/842B01J2523/72B01J2523/54B01J2523/37B01J2523/67B01J2523/68B01J2523/847
Inventor 朱蔚仇建朱彦兆冯嘉炜
Owner 江苏康润净化科技有限公司
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