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Magnetic MgO adsorbent as well as preparation method and application thereof

An adsorbent and magnetic technology, which is applied in the field of magnetic MgO adsorbent and its preparation, can solve the problems of poor adsorption effect of the adsorbent, and achieve the effect of fast adsorption speed and strong pH value adaptability

Pending Publication Date: 2022-04-12
TIBET UNIV
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Problems solved by technology

[0004] At present, the removal of fluorine and arsenic ions in geothermal water mainly adopts adsorbent adsorption. The common adsorbents are oxide adsorbents, mainly MgO, Fe 2 o 3 、Al 2 o 3 and TiO 2 etc. However, the adsorption effect of these oxide adsorbents is not good. Taking commercial MgO as an example, its adsorption efficiency for fluorine is only 66%, and the residual concentration of fluorine after adsorption cannot meet the limit of fluorine in surface water and drinking water. standard

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  • Magnetic MgO adsorbent as well as preparation method and application thereof
  • Magnetic MgO adsorbent as well as preparation method and application thereof
  • Magnetic MgO adsorbent as well as preparation method and application thereof

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preparation example Construction

[0036] The invention provides a kind of preparation method of magnetic MgO adsorbent, comprises the following steps:

[0037] Mix the soluble ferric source, magnesium citrate and water, heat and evaporate to obtain the precursor mixture;

[0038] The precursor mixture is calcined to obtain a magnetic MgO adsorbent.

[0039] The invention mixes the soluble ferric iron source, magnesium citrate and water, heats and evaporates to obtain the precursor mixture. In the present invention, the soluble ferric iron source is preferably FeCl 3 , Fe(NO 3 ) 3 and Fe 2 (SO 4 ) 3 one or more of them.

[0040] In the present invention, the magnesium citrate is preferably magnesium citrate nonahydrate.

[0041] In the present invention, in the soluble ferric iron source and magnesium citrate, the molar ratio of Fe and Mg is preferably 1:1-5, preferably 1:3.

[0042] In the present invention, the mass ratio of the magnesium citrate to water is preferably 1:20.

[0043] In the present ...

Embodiment 1

[0057] FeCl 3 Add magnesium citrate to 10mL water, keep the molar ratio of Fe / Mg at 1 / 1, 1 / 3 and 1 / 5 respectively, stir and volatilize in a water bath at 60-90°C, transfer to a muffle furnace for calcination for 1- 5h, the calcination temperatures were 600, 700 and 800°C, and the heating rate was 5°C / min, and the magnetic MgO adsorbent Fe 3 o 4 @MgO.

[0058] For performance comparison, FeCl is omitted 3 The addition of MgO material derived from single magnesium citrate was prepared.

[0059] figure 1 is the adsorbent Fe of the present invention 3 o 4 Schematic diagram of the preparation of @MgO and its removal of fluorine and arsenic from geothermal water.

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Abstract

The invention provides a magnetic MgO adsorbent as well as a preparation method and application thereof, and belongs to the technical field of adsorption materials. The preparation method comprises the following steps: mixing a soluble ferric iron source, magnesium citrate and water, heating and evaporating to obtain a precursor mixture; and calcining the precursor mixture to obtain the magnetic MgO adsorbent. Magnesium citrate serves as a magnesium source, citrate radicals play a role of a pore-forming agent in the calcination process, porous MgO can be formed in the high-temperature calcination process, the magnetic adsorbent can be hydrolyzed to form Mg (OH) 2 when used for water treatment, and the Mg (OH) 2, F <-> and As (V) are subjected to ion exchange adsorption, so that fluorine and arsenic ions in water are removed. In the calcining process, the magnetic MgO adsorbent can form a micropore structure, and the adsorption capacity of fluorine and arsenic ions is increased. Due to the introduction of an iron source, the magnetic MgO adsorbent contains Fe3O4, so that the adsorbent can be conveniently separated and removed from water.

Description

technical field [0001] The invention relates to the technical field of adsorption materials, in particular to a magnetic MgO adsorbent and a preparation method and application thereof. Background technique [0002] my country has abundant geothermal resources, and geothermal resources are distributed in almost every province. High-temperature geotropics are often distributed in my country's Tibet and Yunnan. According to reports, there are 129 hydrothermal systems in Tibet with reservoir temperatures higher than 150°C, of ​​which 12 have reservoir temperatures higher than 200°C. As a cheap, clean and abundant new energy and precious water resource, geothermal water has been strongly supported and developed by the state and local governments for its development and application. [0003] Geothermal water often contains high concentrations of harmful substances such as fluorine and arsenic. Taking the Yangbajing hot field as an example, the concentration of total arsenic in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F101/10C02F101/14
Inventor 张强英于涛谭欣
Owner TIBET UNIV
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