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Adsorbent for anion and cation adsorption and preparation method thereof

An anion and cation and adsorbent technology, applied in the field of environmental pollution control, can solve the problems of high cost and difficult separation of adsorbents, and achieve the effects of short preparation period, increased specific surface area and simple preparation method

Active Publication Date: 2018-02-16
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide an adsorbent for the adsorption of anions and cations and a preparation method thereof, so as to improve the problems of high cost and difficult separation of the adsorbent

Method used

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  • Adsorbent for anion and cation adsorption and preparation method thereof
  • Adsorbent for anion and cation adsorption and preparation method thereof
  • Adsorbent for anion and cation adsorption and preparation method thereof

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preparation example Construction

[0035] The invention provides a kind of preparation method of the adsorbent used for anion and cation adsorption, comprising the following steps:

[0036] S1: Obtain or prepare a weakly acidic magnetite solution.

[0037] In an optional embodiment of the present invention, the step of preparing weakly acidic magnetite solution comprises:

[0038] S1.1: Dissolving magnetite with acid to form a magnetite solution.

[0039] Further, in an optional embodiment of the present invention, while adding the acid or after adding the acid, stirring or shaking is performed for a period of time to promote dissolution.

[0040] Further, in an optional embodiment of the present invention, the acid used to dissolve the magnetite is hydrochloric acid with a volume concentration of 5-80%, and the acid dissolution time is 120min-2880min.

[0041] Dissolving magnetite with acid can also be referred to as acid-dissolving for short. The magnetite solution obtained by acid-dissolving treatment is b...

Embodiment 1

[0070] A preparation method for an adsorbent for anion and cation adsorption, comprising the following steps:

[0071] 1) Take 0.5g of industrial magnetite, place it in a 1000mL beaker containing 250ml of 1M hydrochloric acid, and stir evenly with a high-speed stirrer for 2880min. Then add 8g of sodium hydroxide and stir for 15 minutes, then add 0.4625g of lanthanum nitrate hexahydrate to ensure that the total mass ratio of lanthanum nitrate hexahydrate to the theoretical composite material is 0.25:1. The pH was then adjusted to 10 with 1M sodium hydroxide.

[0072] 2) Wash the composite product prepared in the above steps with ultrapure water until neutral, centrifuge and dry. Then place it in a muffle furnace for calcination at 200°C for 2 hours to obtain lanthanum-based modified industrial magnetite (adsorbent La-Fh@Mag).

Embodiment 2

[0074] A preparation method for an adsorbent for anion and cation adsorption, comprising the following steps:

[0075] 1) Take 0.5g of industrial magnetite, place it in a 1000mL beaker containing 250ml of 1M hydrochloric acid, and stir evenly with a high-speed stirrer for 2880min. Then add 8g of sodium hydroxide and stir for 15min, then add 0.0925g of lanthanum nitrate hexahydrate to ensure that the total mass ratio of lanthanum nitrate hexahydrate to the theoretical composite material is 0.05:1. The pH was then adjusted to 10 with 1M sodium hydroxide.

[0076] 2) Wash the composite product prepared in the above steps with ultrapure water until neutral, centrifuge and dry. Then place it in a muffle furnace for calcination at 200°C for 2 hours to obtain lanthanum-based modified industrial magnetite (adsorbent La-Fh@Mag).

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Abstract

Belonging to the field of environmental pollution control, the invention provides an adsorbent for anion and cation adsorption and a preparation method thereof. Specifically, the preparation method includes the steps of: adding a lanthanum salt into a weakly acidic magnetite solution, and adding alkali to adjust the magnetite solution to alkaline, mixing the substances evenly, then conducting washing with water to neutral, and the carrying out dehydration, calcination and grinding. The adsorbent has a core-shell structure, and comprises a magnetic composite material and lanthanum hydroxide loaded to the composite material. The composite material includes ferrihydrite coated magnetite. The adsorbent provided by the invention has high efficiency adsorption capacity on anions and cations, also is low in preparation cost, and is easy for separation. The preparation method provided by the invention is simple and has low energy consumption, the prepared sample is magnetic and is easy to separate, at the same time, the preparation process is a liquid phase reaction process, has no need for harmful reagent, and is easy for large-scale preparation. And the adsorbent has wide application prospects in the field of pollution control.

Description

technical field [0001] The invention relates to the field of environmental pollution control, in particular to an adsorbent for anion and cation adsorption and a preparation method thereof. Background technique [0002] With the rapid development of industrial and agricultural production technology, a large amount of wastewater is discharged into surface water bodies, causing the concentration of pollutants in surface water bodies to increase. The main way for pollutants to enter the water environment is the discharge of industrial wastewater and domestic sewage. Therefore, effective removal of pollutants before sewage and wastewater discharge is an important means of controlling water pollution. At present, the main methods for treating pollutants include chemical precipitation, biological methods, and adsorption methods. Among them, the adsorption method is a method suitable for treating solute pollutants in solutions with low pollutant content. It has the advantages of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/28B01J20/06C02F1/28C02F101/10C02F101/16
CPCB01J20/02B01J20/0207B01J20/06B01J20/28009B01J20/28057C02F1/281C02F2101/105C02F2101/163
Inventor 朱润良傅浩洋陈情泽刘晶朱建喜何宏平
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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