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Material with adsorption-precipitation composite function as well as preparation method and application thereof

A compound function and compound salt technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as difficulty in achieving heavy metal stabilization effects, low adsorption affinity of heavy metals, eutrophication of water media, etc. Achieve good heavy metal stabilization effect, optimize capture ability and stabilization performance, and achieve good stability

Active Publication Date: 2022-03-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are methods to combine the two for the stabilization of heavy metals, but they show low adsorption affinity for heavy metals, poor stabilization performance, and it is difficult to achieve long-term heavy metal stabilization effects
In addition, traditional phosphoric acid group-containing materials mainly contain phosphates, and there is a risk of phosphorus leaching, which can easily lead to acidification of soil media and eutrophication of water media.

Method used

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  • Material with adsorption-precipitation composite function as well as preparation method and application thereof
  • Material with adsorption-precipitation composite function as well as preparation method and application thereof
  • Material with adsorption-precipitation composite function as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0045] In one of the specific examples, the preparation method of the carrier material includes the following steps:

[0046] Phosphate and calcium salt are subjected to hydrothermal precipitation reaction at 85°C to 95°C, and the obtained solid is subjected to high temperature aging reaction at 500°C to 600°C. Understandably, after the high-temperature aging reaction is completed, crushing and sieving may also be performed.

[0047] In one specific example, the molar ratio of the iron element to the manganese element in the compound salt is 1:(0.8-1.2). Specifically, the molar ratio of iron element to manganese element in the compound salt includes but not limited to: 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2.

[0048] In one specific example, the content of phosphoric acid groups in the carrier material is 4-6 mmol / g.

[0049] In one specific example, the mass ratio of the carrier material to the loading agent is 1:(25-35). Specifically, the mass ratio of the carrier material to th...

Embodiment 1

[0070] This example provides a method for preparing a stabilized heavy metal composite functional material with adsorption-precipitation, the steps are as follows:

[0071] (1) Preparation of loading agent solution: Mix ferrous nitrate and potassium permanganate with a molar ratio of iron and manganese elements of 1:0.8 into ultrapure water, stir until the iron and manganese salts are completely dissolved, and the concentration of the iron salts is 0.5mol / L , the concentration of manganese salt is 0.4mol / L;

[0072] (2) Preparation of carrier material: Slowly inject diammonium hydrogen phosphate solution into calcium chloride solution, monitor and adjust the pH value of the system to keep it between 9 and 10, stir at 70°C until the water is evaporated to dryness, and the obtained solid is heated at 600°C Aged for 4 hours, crushed through a 200-mesh sieve to obtain a carrier material, wherein the content of phosphoric acid groups was 4.98mmol / g;

[0073] (3) Preparation of ads...

Embodiment 2

[0077] This example provides a method for preparing a stabilized heavy metal composite functional material with adsorption-precipitation, the steps are as follows:

[0078] (1) Preparation of loading agent solution: Mix ferrous nitrate and potassium permanganate with a molar ratio of iron and manganese elements of 1:1 into ultrapure water, stir until the iron and manganese salts are completely dissolved, and the concentration of iron salts is 0.4mol / L , the concentration of manganese salt is 0.4mol / L;

[0079] (2) Preparation of carrier material: Slowly inject diammonium hydrogen phosphate solution into calcium chloride solution, monitor and adjust the pH value of the system to keep it between 9 and 10, stir at 70°C until the water is evaporated to dryness, and the obtained solid is heated at 600°C Aging for 4 hours, pulverized through a 200 mesh sieve to obtain a carrier material, wherein the content of phosphoric acid groups is 4.67mmol / g;

[0080] (3) Preparation of adsorp...

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Abstract

The invention relates to a material with an adsorption-precipitation composite function as well as a preparation method and application thereof. The material with the adsorption-precipitation composite function comprises a carrier material and a loading agent loaded on the carrier material, the carrier material comprises a phosphate group; the loading agent is composite salt formed by ferric salt and manganese salt. The material is high in heavy metal adsorption affinity and good in stabilization performance, and the long-acting heavy metal stabilization effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of pollution prevention and control, in particular to a material with adsorption-precipitation composite function and its preparation method and application. Background technique [0002] The rapid development of modern industry has led to a rapid increase in the total amount of pollutant discharge, and the quality of regional water and soil environments has declined significantly, especially heavy metal pollution. Heavy metal pollution has the characteristics of concealment and high toxicity. It can directly or indirectly endanger the health of animals, plants and humans. It is currently a relatively serious environmental problem facing the world. Based on the difficulty of biodegradation of heavy metals, effectively improving the stability of heavy metals in environmental media has become the key to the remediation of heavy metal pollution. Stabilization technology is widely used in pollution remediation ...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/30B09C1/08C02F1/28C02F101/20
CPCB01J20/0292B01J20/0229B01J20/0222C02F1/281B09C1/08C02F2101/20
Inventor 李广贺苗秋慈
Owner TSINGHUA UNIV
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