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A kind of chitosan-silica gel hybrid magnetic adsorbent and its preparation method and application

A hybrid technology of magnetic adsorbent and silica gel, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as easy swelling, achieve fast adsorption rate, simple operation, and broad application prospects Effect

Inactive Publication Date: 2018-10-26
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of chitosan itself, such as insoluble in water, easy to swell, and too much affected by pH, it must be properly modified before it can be better used in wastewater treatment.

Method used

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  • A kind of chitosan-silica gel hybrid magnetic adsorbent and its preparation method and application
  • A kind of chitosan-silica gel hybrid magnetic adsorbent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation steps of chitosan-silica gel hybrid magnetic adsorbent:

[0032] (1) take by weighing 4g chitosan, add volume percent concentration wherein to it and be 2% acetic acid aqueous solution 100ml, leave standstill until chitosan is all dissolved after stirring, obtain chitosan solution; Take by weighing 30g silica gel (60- 100 mesh) in a constant temperature drying oven at 110°C for 2 hours for later use; finely grind the magnetite powder to below 0.043 mm, weigh 0.2 g for later use; measure 2 ml of tetramethoxysilane binder for later use;

[0033] (2) Add activated silica gel, magnetic seed, binding agent successively in the above-mentioned prepared chitosan solution, blend 4h;

[0034] (3) The homogeneously mixed blend solution is sprayed into shape by a droplet generator, then transferred to a 2mol / L sodium hydroxide solution for deposition and aging for 2 hours;

[0035] (4) Separate the formed adsorbent microspheres from the alkali solution with a magnet...

Embodiment 2

[0039] 1. Preparation steps of chitosan-silica gel hybrid magnetic adsorbent:

[0040] (1) take by weighing 5g chitosan, add volume percentage concentration wherein to it and be 2% formic acid aqueous solution 100ml, leave standstill until chitosan is all dissolved after stirring, obtain chitosan solution; Take by weighing 20g silica gel (60- 100 mesh) activated in a constant temperature drying oven at 100°C for 1 hour for later use; finely grind the magnetite powder to below 0.043mm, weigh 0.4g for later use; measure 5ml of KH-570 binder for later use;

[0041] (2) Add activated silica gel, magnetic seed, binding agent successively in the above-mentioned prepared chitosan solution, blend 4h;

[0042] (3) The homogeneously mixed blend solution is sprayed into shape by a droplet generator, then transferred to a 2mol / L sodium hydroxide solution for deposition and aging for 2 hours;

[0043] (4) Separate the formed adsorbent microspheres from the alkali solution with a magnet bl...

Embodiment 3

[0047] 1. Preparation steps of chitosan-silica gel hybrid magnetic adsorbent:

[0048] (1) take by weighing 3g chitosan, add volume percentage concentration wherein to it and be 2% acetic acid aqueous solution 100ml, leave standstill until chitosan is all dissolved after stirring, obtain chitosan solution; Take by weighing 20g silica gel (60- 100 mesh) in a constant temperature drying oven at 120°C for 1 hour for later use; finely grind the magnetite powder to below 0.043 mm, weigh 0.3 g for later use; measure 4 ml of epichlorohydrin binder for later use;

[0049] (2) Add activated silica gel, magnetic seed, binding agent successively in the above-mentioned prepared chitosan solution, blend 4h;

[0050] (3) The homogeneously mixed blend solution is sprayed into shape by a droplet generator, then transferred to a 2mol / L sodium hydroxide solution for deposition and aging for 2 hours;

[0051] (4) Separate the formed adsorbent microspheres from the alkali solution with a magnet ...

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Abstract

The invention belongs to the technical field of chitosan applications, and particularly relates to a chitosan-silica gel hybridized magnetic adsorbent as well as a preparation method and an application thereof. The adsorbent comprises chitosan, silica gel, magnetic seeds and a binder in the mass ratio being 1: (4-10): (0.05-0.5): (0.1-3) and is prepared with a method including steps of blending, spray deposition modeling and medium-temperature drying. The chitosan-silica gel hybridized magnetic adsorbent has the advantages of good acid resistance, high mechanical strength, easiness in solid-liquid separation, high adsorption speed, good recyclability and the like. The preparation technological process of the adsorbent is simple, the cost is low, and the adsorbent is environment-friendly and can be applied to harmless utilization and resource utilization of low-concentration heavy metal ions in wastewater.

Description

technical field [0001] The invention belongs to the technical field of chitosan application, in particular to a chitosan-silica gel hybrid magnetic adsorbent and its preparation method and application. Background technique [0002] At present, with the development of industry, industries such as metallurgy, electroplating, mining, and chemical industry produce a large amount of wastewater containing heavy metals. More and more heavy metals enter natural water bodies and soils and cause harm to human body. Heavy metal pollution in water has become a major environmental problem to be solved worldwide. How to reduce and control heavy metal pollution has always been a hot issue in the field of environmental protection in the world. [0003] The types, contents and forms of heavy metal ions in wastewater vary with different production types. At present, the commonly used methods for removing heavy metals from aqueous solutions mainly include chemical precipitation, reverse osm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
Inventor 严波郑其车小奎段锦
Owner 有研资源环境技术研究院(北京)有限公司