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Magnetic lanthanum-loaded attapulgite clay dephosphorization adsorbent as well as preparation and application methods thereof

A technology of attapulgite clay and phosphorus adsorbent, which is applied in chemical instruments and methods, separation methods, adsorbed water/sewage treatment, etc. High rate, low environmental impact, and the effect of recycling

Pending Publication Date: 2021-07-23
北京师范大学珠海校区
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption materials in the prior art usually have the disadvantages of low saturated adsorption capacity and the phosphorus removal efficiency is easily affected by pH. Therefore, it is necessary to increase the adsorption capacity of the adsorbent and enhance the anti-interference ability of the adsorbent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a magnetic lanthanum-loaded attapulgite clay phosphorus-removing adsorbent. The phosphorus-removing adsorbent includes an attapulgite clay carrier, and lanthanum and ferric oxide are loaded on the attapulgite clay carrier. The preparation method of the magnetic lanthanum-loaded attapulgite clay phosphorus removal adsorbent described in this example comprises the following steps:

[0023] (1) Attapulgite clay was calcined at 400°C for 2 hours to obtain attapulgite clay carrier.

[0024] (2) Pour 100ml of deionized water into a 250mL three-neck flask, add 3.0g of the attapulgite clay carrier calcined in step (1); stir under the protection of a nitrogen atmosphere, and add 2.78g of FeSO 4 ·7H 2 O and 3.25 g FeCl 3 After stirring for 15min, FeSO 4 ·7H 2 O and FeCl 3 The ratio of the amount of substances is 1:2.

[0025] (3) Quickly add 40 mL of ammonia water with a mass concentration of 25 wt % into the three-necked flask, fully stir and react...

Embodiment 2

[0030] This embodiment provides a magnetic lanthanum-loaded attapulgite clay phosphorus-removing adsorbent. The phosphorus-removing adsorbent includes an attapulgite clay carrier, and lanthanum and ferric oxide are loaded on the attapulgite clay carrier. The preparation method of the magnetic lanthanum-loaded attapulgite clay phosphorus removal adsorbent described in this example comprises the following steps:

[0031] (1) Attapulgite clay was calcined at 500°C for 3 hours to obtain attapulgite clay carrier.

[0032] (2) Pour 100ml of deionized water into a 250mL three-necked flask, add 3.5g of the attapulgite clay carrier calcined in step (1); stir under the protection of nitrogen atmosphere, add 3.34g of FeSO 4 ·7H 2 O and 4.86 g FeCl 3 After stirring for 15min, FeSO 4 ·7H 2 O and FeCl 3 The ratio of the amount of the substance is 1:2.5.

[0033] (3) Quickly add 40 mL of ammonia water with a mass concentration of 28 wt% into the three-necked flask, fully stir and react a...

experiment example

[0039] Phosphorus removal ability test experiment

[0040] Configure the phosphate solution, using the La-ATP@Fe prepared in the above-mentioned embodiment 1-2 3 o 4 Adsorption experiments were carried out on the adsorbent, and the conclusions are as follows:

[0041] (1) La-ATP@Fe prepared in Example 1-2 above 3 o 4 The adsorption capacity of the adsorbent to phosphate is relatively large, wherein the adsorbent prepared in Example 1, when the dosage of the adsorbent is 2g / L, the initial concentration of phosphate is 100mg / L, and the adsorption time is 12h, at 25 Theoretical saturated adsorption capacity at ℃, 30℃ and 35℃ is 42.95mg / g, 57.04mg / g and 73.06mg / g respectively.

[0042] (2) Under the condition of 30°C, when the initial concentration of phosphate (calculated as P) is less than 60mg / L, the dosage of adsorbent is 2g / L, and when the adsorption time is 12h, the prepared in Examples 1 and 2 La-ATP@Fe 3 o 4 The phosphate removal efficiency of the adsorbent is great...

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PUM

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Abstract

The invention provides a magnetic lanthanum-loaded attapulgite clay dephosphorization adsorbent, which comprises an attapulgite clay carrier, and lanthanum and ferroferric oxide are loaded on the attapulgite clay carrier. The attapulgite clay carrier provided by the invention provides an ideal structure without additional structural modification, and can ensure uniform distribution of lanthanum loaded in surface and internal mesh holes, thereby improving the adsorption capacity of the adsorbent. Meanwhile, the problem that the lanthanum modified adsorption material is easy to block in the modification process is also solved. According to the method disclosed by the invention, magnetic materials are added to the attapulgite clay by a method of adding Fe3O4, and the magnetic materials are easily separated from a water body, so that effective recovery of phosphate and reutilization of the materials are realized. Therefore, the magnetic lanthanum hydroxide modified attapulgite clay adsorbent (La-ATP-coated Fe3O4) provided by the invention can be used for efficiently adsorbing and recycling the phosphorus in the water body.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a magnetic lanthanum-loaded attapulgite clay phosphorus-removing adsorbent and a preparation method and an application method thereof. Background technique [0002] Phosphorus is one of the key nutrients in most aquatic and terrestrial ecosystems, and excessive phosphorus input into water can lead to eutrophication, which can have devastating consequences for aquatic ecosystems, including excessive growth of harmful algal blooms and Proliferation of dead zones in coastal marine ecosystems. In order to avoid eutrophication and ensure the biological stability of water, my country requires that the phosphorus concentration in discharged wastewater be <0.5mg / L. Therefore, the removal of phosphorus in water has become a key issue in controlling water eutrophication. [0003] There are several existing methods for removing phosphate from water, including chemi...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/28B01J20/30B01J20/34C02F1/28C02F101/10
CPCB01J20/12B01J20/06B01J20/28059B01J20/28071B01J20/28083B01J20/28009B01J20/3475C02F1/281C02F2101/105
Inventor 王圣瑞赵爽倪兆奎
Owner 北京师范大学珠海校区
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