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Magnetic palladium-carrying nitrogen-doped mesoporous carbon catalyst, preparation method and application thereof

A nitrogen-hybridized mesoporous carbon and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of easy agglomeration and low water solubility of metal particles, and achieve uniform distribution, Stabilizing mesoporous structure and preventing agglomeration

Inactive Publication Date: 2017-03-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, in the redox treatment method, bimetallic catalysts are the most widely used catalysts, but there are common problems such as easy agglomeration of metal particles and low water solubility.

Method used

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  • Magnetic palladium-carrying nitrogen-doped mesoporous carbon catalyst, preparation method and application thereof
  • Magnetic palladium-carrying nitrogen-doped mesoporous carbon catalyst, preparation method and application thereof
  • Magnetic palladium-carrying nitrogen-doped mesoporous carbon catalyst, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0045] A magnetic palladium nitrogen hybrid mesoporous carbon catalyst of the present invention, the catalyst carrier is nitrogen hybrid mesoporous carbon, palladium nanoparticles and iron nanoparticles are supported on the surface and micropores of nitrogen hybrid mesoporous carbon.

[0046] Wherein, the distance between the rod-like structures of nitrogen hybridized mesoporous carbon is 0.4 μm-0.5 μm, the particle diameter of palladium nanoparticles is 40nm-50nm; the particle diameter of iron nanoparticles is 40nm-50nm.

[0047] The preparation method of the above-mentioned magnetically loaded palladium nitrogen hybridized mesoporous carbon catalyst comprises the following steps:

[0048] (1) Synthesis of mesoporous silicon template SBA-15

[0049] Dissolve 8g of block copolymer P123 in hydrochloric acid solution, add 17g of ethyl orthosilicate, heat in a water bath, and control the temperature at 35°C; heat the above-mentioned mixture at 140°C for 24h for hydrothermal react...

Embodiment 2

[0060] Example 2: Investigate the catalytic reduction of magnetically supported palladium nitrogen hybridized mesoporous carbon catalyst

[0061] Prepare 3 batches of the same 50mL solution containing hexavalent chromium ion Cr(VI) with a concentration of 50mg / L in each batch of 5 groups, and add 8mg HCOONa, 8mg Pd-Fe / NMC, 8mg Fe / NMC to each batch of 5 groups respectively. NMC, 8mg Fe / NMC+8mgHCOONa, 8mgPd-Fe / NMC+8mgHCOONa. Adjust the pH value to 2, carry out the catalytic reduction reaction at 30°C and 150rpm, the shaking time is 1h, take 1.5mL of the solution after magnetic separation, take 80μL of the supernatant, dilute it to 8ml, measure the concentration of heavy metals in the supernatant, and calculate six The amount of chromium removal. After the remaining part was diluted to 100ml, the concentration of total Cr and Cr(VI) in the solution after Pd-Fe / NMC treatment was measured by atomic absorption instrument and ultraviolet spectrophotometry, and the amount of catalyti...

Embodiment 3

[0063] Example 3: The influence of different acid-base conditions on the catalytic reduction of hexavalent chromium ion Cr(VI) in water by the magnetic-supported palladium-nitrided mesoporous carbon catalyst was investigated.

[0064] Prepare 3 batches of the same aqueous solution, each batch including 4 groups of 50mL solutions containing hexavalent chromium ion Cr(VI) with a concentration of 50mg / L and HCOONa with a concentration of 600mg / L, and adjust the pH of the 4 groups of solutions respectively Values ​​are 2, 3, 5, 7. To each batch of 4 groups of Cr(VI) solutions containing hexavalent chromium ions, add 8 mg of the magnetic palladium-nitrogen hybrid mesoporous carbon catalyst prepared in Example 1, and carry out the catalytic reduction reaction at 30 ° C and 150 rpm. The time is 1h. Take 1.5 mL of the solution after the catalytic reduction reaction, take 80 μL of the supernatant after magnetic separation, dilute it to 8 mL, measure the concentration of heavy metals i...

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Abstract

The invention discloses a magnetic palladium-carrying nitrogen-doped mesoporous carbon catalyst, a preparation method and an application thereof. A carrier of the magnetic palladium-carrying nitrogen-doped catalyst is nitrogen-doped mesoporous carbon, wherein palladium nano particles and iron nano particles are carried by surface of and pores in the nitrogen-doped mesoporous carbon. The preparation method includes the steps of: dissolving palladium salt to obtain a palladium salt solution, adding the magnetic nitrogen-doped mesoporous carbon to the palladium salt to obtain a mixture liquid; adding a formic acid solution to the mixture liquid, and performing a heating reaction to prepare the catalyst. The catalyst has stable structure and high catalytic performance, can prevent aggregation of the palladium nano particles and iron nano particles, and can be applied for removing Cr(VI) ions in water.

Description

technical field [0001] The invention belongs to the field of mesoporous carbon catalysts, and in particular relates to a magnetically supported palladium nitrogen hybridized mesoporous carbon catalyst and a preparation method and application thereof. Background technique [0002] There are two main particle forms of chromium in water, trivalent chromium and hexavalent chromium, among which hexavalent chromium is a recognized human killer. Because hexavalent chromium (Cr(VI)) is extremely toxic, it is considered to be one of the three serious pollutants in the world. Hexavalent chromium can enter the human body through food chains and drinking water, causing serious impacts on human health. Hexavalent chromium (Cr(VI)) is a commonly used heavy metal, which has a wide range of applications in the process of industrial production, such as steel industry and clothing industry. Due to the leakage and improper use of hexavalent chromium in life, serious chromium pollution often ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/745B01J35/10C02F1/70C02F101/22
CPCC02F1/70B01J23/745B01J27/24C02F2101/22B01J35/617B01J35/635
Inventor 汤琳彭博黎思思曾光明张长邓垚成王敬敬王佳佳
Owner HUNAN UNIV
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