Preparation method of xanthate macro-pore dextrangel adsorbent

A dextran gel and xanthate-based technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc. The report on the preparation method and application of polysaccharide gel, the easy removal of discharged wastewater, and the low rate of repeated use have achieved good physical and chemical stability, excellent mechanical stability, and low production costs.

Inactive Publication Date: 2013-02-06
UNIV OF JINAN
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  • Abstract
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Problems solved by technology

The adsorption capacity of cross-linked xanthate chitosan to lead ions is 238.9 mg / g (Wang Chongxia et al., Chemical Research and Application, 2012, 24 (2): 301~304); the most widely used is xanthan ester cotton and its pair A variety of heavy metals and precious metals have a strong adsorption effect. These xanthated polymer materials have a better adsorption effect on heavy metal ions, but their mechanical properties are relatively poor, and they are difficult to recycle in wastewater treatment. Repeated use Disadvantages such as low rate
There are also related reports on modifying inorganic materials with xanthic acid functional groups, such as: a patent with application number 200710018213.7 discloses a xanthated bentonite adsorbent and its preparation method, which provides xanthated bentonite adsorbent for waste water The maximum adsorption capacities of copper ions and lead ions are 39 mg / g and 247 mg / g respectively; preparation of sulfonic acid functionalized magnetic nanoparticles and research on removal of copper ions in water (Wang Chaohui et al., Chemical Engineer, 2012, 7: 15~19 ), the mechanical properties of xanthated inorganic materials are better than those of high-scoring materials, and the adsorption effect on heavy metal ions is also better, but it is not easy to recycle in wastewater, and it is easy to take away in wastewater discharge
[0005] The dextran gel is fully soaked in water for activation, freezing, alkalization, and xanthic acid modification to prepare xanthic acid-based macroporous dextran gel. The macroporous dextran gel is connected with more xanthic acid groups, It not only has the advantages of good mechanical properties of inorganic materials, but also has all the advantages of organic materials. At present, there are no reports on the preparation method and application of xanthic acid-based macroporous dextran gel.

Method used

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  • Preparation method of xanthate macro-pore dextrangel adsorbent

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Embodiment 1

[0021] (1) Preparation of macroporous dextran gel, which is characterized by: in the reactor, soak the dextran gel in distilled water for 40 hours, fully wash with distilled water until neutral, filter, and place it at -12°C for 48 hours to freeze quickly. Take it out and thaw it at room temperature to obtain a macroporous dextran gel;

[0022] (2) Preparation of alkalized macroporous dextran gel, the characteristics are: in the reactor, dissolve 10g of sodium hydroxide in 50mL of water, lower the sodium hydroxide solution to room temperature, add 20g of macroporous dextran gel , keep the temperature within the range of 60°C, stir and react for 40 minutes, cool to room temperature, filter, wash, and dry to obtain alkalized macroporous dextran gel;

[0023] (3) The preparation of xanthan acid-based macroporous dextran gel is characterized by: adding carbon disulfide (CS) with a concentration of 60% in the reactor 2 ) Chloroform solution 20mL, add 6g alkalized macroporous dextr...

Embodiment 2

[0025] (1) Preparation of macroporous dextran gel, which is characterized by: in the reactor, soak the dextran gel in distilled water for 40 hours, fully wash it with distilled water until it is neutral, filter it, and place it at -18°C for 30 hours to freeze quickly. Take it out and thaw it at room temperature to obtain a macroporous dextran gel;

[0026] (2) Preparation of alkalized macroporous dextran gel, which is characterized by: in the reactor, dissolve 12g of sodium hydroxide in 50mL of water, lower the sodium hydroxide solution to room temperature, add 30g of macroporous dextran gel , keep the temperature within the range of 55°C, stir and react for 60 minutes, cool to room temperature, filter, wash, and dry to obtain alkalized macroporous dextran gel;

[0027] (3) The preparation of xanthan acid-based macroporous dextran gel is characterized by: adding 70% carbon disulfide (CS 2 ) Chloroform solution 30mL, add 15g alkalized macroporous dextran gel, lower the system ...

Embodiment 3

[0029](1) Preparation of macroporous dextran gel, which is characterized by: in the reactor, soak the dextran gel in distilled water for 48 hours, fully wash it with distilled water until it is neutral, filter it, and place it at -15°C for 40 hours to freeze quickly. Take it out and thaw it at room temperature to obtain a macroporous dextran gel;

[0030] (2) Preparation of alkalized macroporous dextran gel, which is characterized by: in a reactor, dissolve 15g of sodium hydroxide in 50mL of water, lower the sodium hydroxide solution to room temperature, add 35g of macroporous dextran gel , keep the temperature within the range of 50°C, stir and react for 45 minutes, cool to room temperature, filter, wash, and dry to obtain alkalized macroporous dextran gel;

[0031] (3) The preparation of xanthan acid-based macroporous dextran gel is characterized by: adding 80% carbon disulfide (CS 2 ) Chloroform solution 30mL, add 18g alkalized macroporous dextran gel, lower the system tem...

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Abstract

The invention discloses a preparation method of a xanthate macro-pore dextrangel adsorbent and an application thereof. The preparation method comprises the steps of 1) rapidly cooling dextrangel immersed by distilled water to obtain macro-pore dextrangel; 2) placing the macro-pore dextrangel into an NaOH solution with the concentration of 10-30% and reacting at a constant temperature in a range of 50-60 DEG C for 15-60 min to obtain alkalified macro-pore dextrangel; and 3) enabling the alkalified macro-pore dextrangel and carbon disulfide to react to obtain the xanthate macro-pore dextrangel adsorbent. The preparation method disclosed by the invention has the characteristics of simple preparation method, large specific surface area, great quantity of xanthate, and high adsorption capability of adsorbing heavy metal, and the dextrangel has the characteristics of light weight and low cost, good stability, degradability, environmental friendliness and the like; and the adsorbent disclosed by the invention is used for treating the heavy metal in wastewater and analyzing the separation and enriching effect of the heavy metal in chemistry.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of a xanthic acid-based macroporous dextran gel adsorbent and an application technology for adsorbing heavy metal ions in water treatment. Background technique [0002] With the advancement of science and technology and the rapid development of industry and agriculture, people's material living standards continue to improve, global environmental pollution is increasing, and environmental protection and environmental governance issues have received more and more attention from all walks of life. One of the important pollution sources of polluting environmental water quality is heavy metal ions in industrial wastewater. Heavy metal wastewater mainly comes from mechanical processing, mining, smelting of non-ferrous metals and chemical enterprises. Compared with other pollutants, heavy metal pollution has its uniqueness. One is toxic, can cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 李慧芝许崇娟魏琴
Owner UNIV OF JINAN
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