Preparation method and application of non-metal water-soluble heavy metal adsorbent based on reversible phase transition

A technology of heavy metals and adsorbents, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve problems such as difficult to achieve capture agent molecule recycling, secondary pollution, etc., to achieve good selectivity, preparation The process is simple and the effect of increasing the mass transfer rate

Active Publication Date: 2021-11-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the separation of soluble substances in water based on the interaction between conventional water-soluble molecules often needs to be coupled with precipitation, flocculation and other processes to separate the generated products, which not only leads to the formation of secondary pollutants but also makes it difficult to realize the recycling of capture agent molecules.

Method used

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  • Preparation method and application of non-metal water-soluble heavy metal adsorbent based on reversible phase transition
  • Preparation method and application of non-metal water-soluble heavy metal adsorbent based on reversible phase transition
  • Preparation method and application of non-metal water-soluble heavy metal adsorbent based on reversible phase transition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The preparation method of non-metallic water-soluble dissolved adsorbent comprises the steps:

[0051](1) Weigh 6 g (0.048 mol) of melamine, 0.8 g (0.02 mol) of sodium hydroxide, and 2.24 g (0.04 mol) of potassium hydroxide, and grind them thoroughly in a mortar to obtain a mixture.

[0052] (2) Add the mixture obtained in (1) into a covered crucible, put it into a muffle furnace and raise it from room temperature to 330 °C at a rate of 5 °C / min and keep it for 2 hours. After cooling to room temperature, it is fully ground into powder.

[0053] (3) Dissolve the powder obtained in (2) in 400ml ultrapure water, and then put it into a 3500Da dialysis bag for dialysis for 4 days to obtain a non-metallic water-soluble adsorbent based on the reversible phase transition function.

Embodiment 2

[0055] The difference between the present application and Example 1 is that the raw material consumption of the present example is different from Example 1, and the difference is as follows: 6g (0.048mol) melamine and 0.8g (0.02mol) sodium hydroxide are fully ground in a mortar, Obtain the mixture, then take the calcination and dialysis process of Example 1 to obtain the non-metallic water-soluble adsorbent.

Embodiment 3

[0057] The difference between the present application and Example 1 is that the raw material consumption of the present example is different from Example 1, and the difference is as follows: 6g (0.048mol) melamine and 2.44g (0.04mol) potassium hydroxide are fully ground in a mortar, Obtain the mixture, then take the calcination and dialysis process of Example 1 to obtain the non-metallic water-soluble adsorbent.

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Abstract

The invention provides a preparation method and application of a non-metal water-soluble heavy metal adsorbent based on reversible phase transition. The preparation method of the adsorbent comprises the steps of (1) uniformly mixing melamine and an alkaline substance; (2) heating the mixture in the step (1) to the temperature of 250-600 DEG C, keeping the temperature for 1-5 hours, and cooling to room temperature; and (3) dissolving the solid obtained in the step (2) in ultrapure water, dialyzing in the ultrapure water through a dialysis bag, and drying the liquid in the dialysis bag to obtain the adsorbent. According to the technical scheme, raw materials are cheap and easy to obtain, the preparation process is simple, and secondary activation and other steps are not needed. The adsorbing material has a reversible phase inversion function which is not possessed by other adsorption materials. In addition, the mass transfer rate of an adsorption micro-interface is greatly improved, and the interface action between molecules and ions adsorbed in water is enhanced. No metal ion is needed in the preparation process of the adsorbing material, so that the adsorbing material is environment-friendly.

Description

technical field [0001] This article relates to but not limited to a method for the removal of heavy metal ions in water and water pollution control, especially involves but not limited to a preparation method of a non-metallic dissolved heavy metal adsorbent based on reversible phase transition and its application in pollutant removal . Background technique [0002] With the rapid development of social economy, various types of wastewater containing highly toxic, harmful and refractory substances are continuously discharged into natural water bodies, which poses serious hazards to ecosystem security and human health. Adsorption technology based on physical separation is the most common method to remove heavy metals, organic matter and other pollutants in water. Currently, adsorbents based on porous solids such as activated carbon, zeolites, molecular sieves, and resins are widely used in practical wastewater treatment processes. Nevertheless, insufficient adsorption capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/30C02F1/28C02F101/20
CPCB01J20/0259C02F1/281C02F2101/20
Inventor 兰华春安晓强刘会娟曲久辉
Owner TSINGHUA UNIV
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