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Sludge carbon-based nanocluster magnesium oxide catalyst, preparation method and applications thereof

A nano-cluster, sludge carbon technology, applied in physical/chemical process catalysts, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve problems such as low uniformity, blocking of carrier voids, and large catalyst particles.

Inactive Publication Date: 2020-03-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Magnesium oxide catalyst has excellent catalytic ozone oxidation effect, but because it exists in the form of powder, it is difficult to separate after use, which seriously hinders its practical promotion and application. Therefore, in order to solve the above defects, a magnesium oxide supported catalyst has emerged
[0003] At present, the preparation of magnesia-supported catalysts is usually prepared by the traditional deposition-precipitation method, but in the process of precipitation, it is difficult to control the nucleation position of the catalyst, and the catalyst particles formed by loading are large, low in uniformity, and easy to block. The gaps in the carrier lead to fewer catalytic sites, and the magnesia loaded on the surface of the carrier is prone to agglomeration, resulting in a decrease in catalytic efficiency, and the prepared magnesia-supported catalyst has disadvantages such as poor repeatability.
[0004] Although the magnesia-supported catalyst is intersected with magnesia powder, the catalytic efficiency and application have been improved to a certain extent, but the shortcomings of the above-mentioned magnesia-supported catalyst still need to be improved urgently, which will be more conducive to the promotion of magnesia-supported catalysts Applications

Method used

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  • Sludge carbon-based nanocluster magnesium oxide catalyst, preparation method and applications thereof
  • Sludge carbon-based nanocluster magnesium oxide catalyst, preparation method and applications thereof
  • Sludge carbon-based nanocluster magnesium oxide catalyst, preparation method and applications thereof

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Effect test

Embodiment 1

[0054] A preparation method of sludge carbon-based nano-cluster magnesium oxide catalyst, specifically comprising the following steps:

[0055] S1. Using residual sludge from municipal sewage treatment plants as a precursor material, coupled with paint slag and zinc benzoate as a pore-forming agent, a sludge carbon material with three-level structural pores, including macropores, mesopores, and micropores, was prepared. denoted as SC PS-Zn ;

[0056] S2. Weigh 2g of SC PS-Zn , add 1mol L -1 HNO 3 -3HCl 40mL, carry out surface carboxylation treatment under the condition of hydrothermal 150℃, 10h, after natural cooling, use deionized water to clean the residual oxidant (HNO 3 -HCl), dried and stored for later use, denoted as SC PS-Zn (AR);

[0057] S3. Using modified material SC PS-Zn (AR) is used as an adsorbent to adsorb magnesium ions in magnesium nitrate solution, and by controlling the contact time between the adsorbent and the adsorbate, the SC PS-Zn (AR) Carboxyli...

Embodiment 2

[0060] The influence of condition in the preparation process of embodiment 2

[0061] 1. To adopt SC PS-Zn Cause Analysis

[0062] Using nitric acid as an oxidant, the non-porous, macroporous, micro-mesoporous, microporous-mesoporous-macroporous sludge carbon materials (SC, SC PS 、SC Zn 、SC PS-Zn ) for surface carboxylation treatment, and its carboxylation effect was studied, and the content of acidic functional groups on the surface of different materials after carboxylation was determined by Boehm titration.

[0063] The measured results are as figure 1 shown by figure 1 It can be seen that different sludge carbon materials modified under the same hydrothermal conditions have a hierarchical pore structure sludge carbon (SC PS-Zn ) surface contains the highest amount of acidic groups (Acidic group), which is 0.95mmol L -1 , is a micro-mesoporous sludge carbon material (SC Zn ) is 1.94 times that of macroporous sludge carbon material (SC PS ) is 4.25 times that of slu...

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Abstract

The invention discloses a sludge carbon-based nanocluster magnesium oxide catalyst, a preparation method and applications thereof. The preparation method comprises the following steps: S1, adding a pore-forming agent to sludge used as a precursor material to prepare a three-level pore sludge carbon material, and recording the three-level pore sludge carbon material as SCPS-M; S2, carrying out surface carboxylation treatment on the SCPS-M by adopting an oxidizing agent, drying after the treatment is finished, and recording the obtained material as SCPS-M(AR); S3, adding the SCPS-M(AR) as an adsorbent into a magnesium nitrate solution, adsorbing magnesium ions, forming magnesium carboxylate on the surface of the porous sludge carbon, and recording the obtained material as Mg<2+> / SCPS-M(AR);and S4, calcining the Mg<2+> / SCPS-M (AR) to dehydrate the carboxyl so as to form the nano magnesium oxide cluster on the surface of the porous sludge carbon material, so that the sludge carbon-based nano-cluster magnesium oxide catalyst is obtained and is recorded as MgO / SCPS-M(AR). According to the method disclosed by the invention, the nucleation position of the catalyst is controlled, the covering uniformity of magnesium oxide on the surface of the precursor material is ensured, the formed magnesium oxide is small nano-particles, the hierarchical pore structure of the precursor material ismaintained to the greatest extent, and the catalytic efficiency of the catalyst is high.

Description

technical field [0001] The invention relates to the technical field of magnesium oxide catalysts, in particular to a sludge carbon-based nano-cluster magnesium oxide catalyst and its preparation method and application. Background technique [0002] Magnesium oxide catalyst has an excellent catalytic effect on ozone oxidation, but because it exists in the form of powder, it is difficult to separate after use, which seriously hinders its practical promotion and application. Therefore, in order to solve the above defects, a magnesium oxide-supported catalyst has appeared. [0003] At present, the preparation of magnesium oxide-supported catalysts is usually carried out by traditional deposition-precipitation method, but in the process of precipitation, it is difficult to control the nucleation position of the catalyst, and the catalyst particles formed by loading are large, low in uniformity, and easy to block. The gaps in the carrier cause fewer catalytic sites, and the magnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J35/02B01J35/10C02F1/78C02F1/72B01J35/00
CPCB01J21/18C02F1/78C02F1/725B01J35/40B01J35/61
Inventor 熊亚李思阳冯锦茜田双红姚玲爱
Owner SUN YAT SEN UNIV
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