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Method for preparing modified loess with high adsorption performance

A high-adsorption, loess technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of non-economic long-term, secondary environmental pollution, and economical problems , to achieve the effect of low cost, large adsorption capacity and clear wastewater

Inactive Publication Date: 2012-07-18
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of chemicals or the need for larger equipment and instruments in these technologies, this will cause secondary pollution to the environment and form a greater economic burden.
In addition, the method of using microorganisms has disadvantages such as non-economic and long-term, and is also affected by external conditions.

Method used

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  • Method for preparing modified loess with high adsorption performance
  • Method for preparing modified loess with high adsorption performance
  • Method for preparing modified loess with high adsorption performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 A kind of preparation method of the modified loess with high adsorption performance, comprises the following steps:

[0026] (1) Add 5 g of loess into a three-necked flask equipped with a stirring bar, a reflux condenser, and a gas conduit, add 10 mL of distilled water, and 0 g of acrylic acid and stir evenly at room temperature.

[0027] (2) Then add 8 g of hydroxyethyl methacrylate to the above solution and stir for 30 minutes to obtain a mixed solution after uniformity.

[0028] (3) Add 3g of cross-linking agent glycidyl methacrylate to the mixed liquid, vacuumize, pass inert gas and heat to 40°C, finally add 1g of initiator ammonium persulfate, heat up to 50°C and stir for 20min, that is, To form a complex, the complex is first washed with distilled water, and then dried at 50-100° C. to a constant weight to obtain a loess-based polymer composite adsorbent (LC / PHEMA).

Embodiment 2

[0029] Embodiment 2 A kind of preparation method of the modified loess with high adsorption performance, comprises the following steps:

[0030] (1) Add 4g of loess to a three-necked flask equipped with a stirring rod, a reflux condenser, and a gas conduit, add 20mL of distilled water and 8g of acrylic acid and stir for 50min at room temperature, and then dropwise add the NaOH solution with a neutralization degree of 40%. and, to obtain a neutralized solution.

[0031] (2) Add 0 g of hydroxyethyl methacrylate.

[0032] (3) Add 1g of crosslinking agent glycidyl methacrylate to the neutralization solution, vacuumize, pass inert gas and heat to 60°C, finally add 0.5g of initiator ammonium persulfate, heat up to 70°C and stir for 30min, That is, a complex is formed. The complex is first washed with distilled water, then dried at 50-100°C to constant weight, and ground through a 100-mesh sieve to obtain the loess-based polymer composite adsorbent (LC / PAA).

Embodiment 3

[0033] Embodiment 3 A kind of preparation method of the modified loess with high adsorption performance, comprises the following steps:

[0034] (1) Add 10g of loess to a three-necked flask equipped with a stirring rod, a reflux condenser, and a gas conduit, add 40mL of distilled water and 5g of acrylic acid and stir for 40min at room temperature, and then dropwise add the NaOH solution with a neutralization degree of 60%. and, to obtain a neutralized solution.

[0035] (2) Then add 0.5 g of hydroxyethyl methacrylate to the neutralization solution and stir for 40 minutes to obtain a mixed solution after uniformity.

[0036](3) Add 2g of cross-linking agent glycidyl methacrylate to the mixed solution, vacuumize, pass inert gas and heat to 50°C, finally add 0.3g of initiator ammonium persulfate, stir for 40min when the temperature rises to 80°C, that is When a complex is formed, the complex is first washed with distilled water, then dried to constant weight at 50-100°C, and gro...

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Abstract

The invention relates to a method for preparing modified loess with high adsorption performance. The method comprises the following steps of: (1) after stirring loess, distilled water and acrylic acid uniformly under room temperature, dropwise adding a NaOH solution with neutralization being 40-90% for neutralization to obtain a neutralization solution; (2) then adding hydroxyethyl methacrylate to the neutralization solution and stirring the materials uniformly to obtain mixed liquor; and (3) adding a crosslinking agent glycidyl methacrylate to the mixed liquor, heating the materials to 40-90 DEG C after introducing inert gases, finally adding an initiator ammonium persulfate, stirring the materials for 20-120 minutes when raising the temperature to 50-95 DEG C, thus generating a composite, and washing and drying the composite to a constant weight, thus obtaining the loess-based polymer composite adsorbent. The method has the following advantages that the natural loess is used as the raw material and is modified by acrylic acid and hydroxyethyl methacrylate to obtain the loess-based polymer composite adsorbent; and the loess-based polymer composite adsorbent is applied to treatment of wastewater containing heavy metal ions and dyes and has the characteristics of strong absorbability and large adsorption capacity.

Description

technical field [0001] The invention relates to the technical field of polymer synthetic adsorbents, in particular to a method for preparing modified loess with high adsorption performance. Background technique [0002] Loess is a kind of light yellow or brownish yellow soil, its particle size is between clay and fine sand, the particle composition is mainly silt particle size (content > 50%), rich in calcium carbonate, sometimes containing sulfate or chlorine Compound salts, Quaternary continental sediments with pores visible to the naked eye. Loess is widely distributed in the world, accounting for one-tenth of the global land area, mainly in Asia, Russia, the Middle East and North America. In China, loess is mainly distributed in a strip from west to east between 30° and 48° north latitude, covering an area of ​​about 640,000 square kilometers. Because loess has rich sources, it has been reported in literature and patents that loess can be used to treat organic matte...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62C02F1/58
Inventor 何玉凤张玲王荣民王燕
Owner NORTHWEST NORMAL UNIVERSITY
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