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Preparation method and applications of magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent

A technology of lanthanum oxycarbonate and phosphorus adsorbent, which is applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of difficult recycling and low adsorption capacity, and achieve short preparation cycle and high production efficiency. Simple process and good reproducibility

Active Publication Date: 2020-01-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the relatively low adsorption capacity of most lanthanum-based loading materials and the difficulty of recycling and reuse after adsorption, the present invention provides a simple preparation process, low preparation cost, good effect on phosphorus removal in water, and easy magnetic separation, recovery and reuse. Preparation method and application of magnetic recyclable lanthanum oxycarbonate dephosphorization adsorbent

Method used

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  • Preparation method and applications of magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent
  • Preparation method and applications of magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent
  • Preparation method and applications of magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent

Examples

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Embodiment 1

[0042] In this embodiment, a magnetic recyclable lanthanum oxycarbonate dephosphorization adsorbent is prepared according to the following steps:

[0043] Step 1, the synthesis of lanthanum / iron composite metal organic framework precursor:

[0044] (1) Weigh 10 mmol (2.10 g) of trimesic acid, dissolve it in 900 ml of a water / alcohol mixed solution with a volume ratio of 1:1, and place it in a magnetic stirring constant temperature water bath at 60 °C with a constant temperature stirring bar for 0.5 h. Get liquid A;

[0045](2) Weigh 6.67 mmol (2.89 g) of lanthanum nitrate hexahydrate and 3.33 mmol (0.90 g) of ferric chloride hexahydrate, and dissolve them in 100 ml of deionized water to obtain liquid B;

[0046] (3) Under the condition of constant temperature water bath at 60 ℃, drop liquid B into liquid A drop by drop, under the action of vigorous magnetic stirring, react for 1 h, and then stand for 0.5 h to obtain light orange lanthanum / iron (2:1 , molar ratio) composite o...

Embodiment 2

[0073] The difference between this example and Example 1 is that the dosages of lanthanum nitrate hexahydrate and ferric chloride hexahydrate are both 5 mmol, and the molar ratio of metallic lanthanum to iron is 1:1.

[0074] The experimental conditions listed in Application Example 1 are used to detect its phosphorus adsorption performance, and the results show that La 2 o 2 CO 3 / γ-Fe 2 o 3 The (1:1) magnetic adsorbent also has a good removal ability for phosphate anions, and its saturated adsorption capacity can reach 102.41 mg P / g.

Embodiment 3

[0076] The difference between this example and Example 1 is that the amount of trimesic acid is 30 mmol.

[0077] The phosphorus removal performance of the magnetic adsorbent in this example was tested by isothermal adsorption batch experiments, and the results showed that its saturated adsorption capacity was 142.56 mg P / g.

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Abstract

The invention discloses a preparation method and applications of a magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent. The method comprises: 1, synthesizing a lanthanum / iron composite metal organic framework precursor; 2, carrying out primary calcination; and 3, carrying out secondary calcination. According to the invention, the prepared magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent is a red brown powder solid in appearance, the microstructure is an obvious rod-shaped and amorphous mixed structure, the surface of the adsorbent is rough and porous,and the adsorbent integrates strong adsorption capacity of a nanometer material and good magnetic separation capacity of a magnetic material; the prepared magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent can remove medium-high concentration phosphorus from industrial wastewater, domestic sewage and the like and medium-low concentration phosphorus from surface water, secondary sedimentation tank effluent and the like; and the preparation method has characteristics of simple preparation process, good reproducibility, short preparation period and the like, and has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of water body pollution treatment, and relates to a preparation method and application of a magnetically recyclable phosphorus-removing adsorbent for removing phosphate radicals in water bodies. Background technique [0002] Phosphorus is an indispensable element of nucleic acid, the basic substance of life, and a non-renewable natural resource. The presence of appropriate amount of phosphorus in water is conducive to promoting the growth of aquatic plants and maintaining the balance of aquatic ecosystems. Once the concentration of phosphorus in the water body exceeds a certain limit, the existence of excess phosphorus will stimulate the massive proliferation of algae and other plankton in the water body, resulting in a decrease in the concentration of dissolved oxygen in the water body, a large number of fish and other organisms die, the deterioration of water quality, and the formation of eutrophication. ...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/28C02F1/28B01J20/30C02F101/10
CPCB01J20/0207B01J20/0229B01J20/0277B01J20/28009C02F1/281B01J20/06C02F2101/105B01J2220/42Y02P10/20
Inventor 王威单苏洁崔福义
Owner HARBIN INST OF TECH
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