Drying agent with heavy metal removal function and preparation method thereof

A desiccant and heavy metal technology, applied in the direction of separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of inability to achieve effective adsorption of heavy metals, corrosiveness of the esophagus, low moisture absorption rate of silica gel, etc., and achieve good complexation ability , Large desorption capacity and fast desorption rate

Pending Publication Date: 2021-10-29
ANQING XINXIANGRUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The moisture absorption rate of silica gel is low; the quicklime desiccant is pulverized after absorbing moisture, and is corrosive to the oropharynx and esophagus; the moisture absorption rate of anhydrous calcium chloride desiccant is high, but it is prone to seepage, etc.
Therefore, the application of desiccants made of a single raw material is limited, and desiccants with only hygroscopic effect can no longer meet most environments that require drying, and cannot achieve effective adsorption of heavy metals, so there are many restrictions on use.

Method used

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  • Drying agent with heavy metal removal function and preparation method thereof
  • Drying agent with heavy metal removal function and preparation method thereof
  • Drying agent with heavy metal removal function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of silica nanopowder:

[0038] Step S1, add 30.5mL of deionized water, 120.4mL of 2mol / L hydrochloric acid solution and 4.1g of P123 into the three-necked flask, raise the temperature to 40°C and stir until dissolved, add 8.8g of tetraethyl orthosilicate to it, stir evenly, and let stand 18h, then heated up to 95°C for 24h, filtered, the filter cake was washed and dried to obtain mesoporous silica;

[0039] Step S2, add 0.2g of mesoporous silica, 30mL of toluene and 0.1g of phosphorus oxychloride to the autoclave, react at 140°C for 3h, filter, wash and dry the filter cake to obtain silica nanopowder.

Embodiment 2

[0041] Preparation of silica nanopowder:

[0042] Step S1, add 30.8mL of deionized water, 120.6mL of 2mol / L hydrochloric acid solution and 4.2g of P123 into the three-necked flask, raise the temperature to 40°C and stir until dissolved, add 8.9g of tetraethyl orthosilicate to it, stir evenly, and let stand 20h, then heated up to 95°C and kept for 24h, filtered, the filter cake was washed and dried to obtain mesoporous silica;

[0043] Step S2, add 0.25g of mesoporous silica, 35mL of toluene and 0.1g of phosphorus oxychloride into the autoclave, react at 150°C for 3h, filter, wash and dry the filter cake to obtain silica nanopowder.

Embodiment 3

[0045] Preparation of silica nanopowder:

[0046] Step S1, add 31.2mL of deionized water, 120.8mL of 2mol / L hydrochloric acid solution and 4.3g of P123 into the three-necked flask, raise the temperature to 40°C and stir until dissolved, add 9g of ethyl orthosilicate to it, stir well, and let it stand for 22h , and then heated to 95 ° C for 24 hours, filtered, and the filter cake was washed and dried to obtain mesoporous silica;

[0047] Step S2, add 0.3g of mesoporous silica, 40mL of toluene and 0.12g of phosphorus oxychloride into the autoclave, react at 160°C for 4h, filter, wash and dry the filter cake to obtain silica nanopowder.

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Abstract

The invention discloses a drying agent with a heavy metal removal function and a preparation method thereof. The preparation method comprises the following steps: 1, preparing bentonite filtered powder; 2, uniformly mixing the bentonite filtered powder, silicon dioxide nano powder and plant starch, adding water, and preparing a suspension; 3, adding an organic modifier and an auxiliary modifier into the suspension, adjusting the pH with a sodium hydroxide solution and then heating to prepare modifiedbentonite; 4, soaking the modified bentonite in a hydrochloric acid solution, washing the modified bentonite to be neutral with deionized water, granulating, and drying to obtain the spherical drying agent with the particle size of 1-3 mm. The prepared drying agent has a good adsorption effect on heavy metal ions, especially for heavy metal ions such as copper, chromium, nickel, lead, iron and zinc, the lead ion adsorption rate can reach 75% or above, and the chromium ion adsorption rate can reach 80% or above.

Description

technical field [0001] The invention belongs to the technical field of desiccants, and relates to a desiccant with the function of removing heavy metals and a preparation method thereof. Background technique [0002] The desiccant came into being in order to avoid the occurrence of defective products caused by excess moisture. The types of desiccants are divided into physical adsorption desiccants and chemical adsorption desiccants according to their drying principles. Physical adsorption desiccants include silica gel, alumina, molecular sieves, charcoal, mineral desiccants, activated clay, etc. Its drying principle is to physically adsorb water molecules in its own structure. Use the desiccant to absorb the moisture in the bagged items, keep the items relatively dry for a long time, regulate the moisture conditions of microbial survival, chemical reactions, photolysis reactions and enzymatic reactions, so as to achieve moisture-proof, mildew-proof, insect-proof and rust-pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/28B01D15/08B01J20/24
CPCB01D53/28B01D15/08B01J20/24B01J20/12B01J20/103B01D2257/80
Inventor 李向峰黄安宁高豹桂园芬余何建汪层层
Owner ANQING XINXIANGRUI CHEM CO LTD
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