Chitosan/sheet silicate nano compound stephanoporate crosslinked microsphere sorbent and preparation method thereof

A layered silicate, cross-linked microsphere technology, applied in silicon compounds, chemical instruments and methods, other chemical processes, etc., can solve problems such as the difficulty of desorption and recovery of heavy metal substances, and achieve the improvement of adsorption process and recovery process, The effect of expanding the scope of application and low price

Inactive Publication Date: 2009-01-21
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the colloidal nature of the layered silicate solution, it is quite stable when dispersed in water, so a flocculant must be used to make it precipitate
In addition, the desorption and recovery of heavy metal substances adsorbed in the sludge-like phyllosilicate is also very difficult.

Method used

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  • Chitosan/sheet silicate nano compound stephanoporate crosslinked microsphere sorbent and preparation method thereof
  • Chitosan/sheet silicate nano compound stephanoporate crosslinked microsphere sorbent and preparation method thereof
  • Chitosan/sheet silicate nano compound stephanoporate crosslinked microsphere sorbent and preparation method thereof

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Embodiment 1

[0042] This embodiment provides a method for preparing a porous microsphere adsorbent that has high-efficiency adsorption and separation capabilities for heavy metal ions and organic pollutants and is inexpensive, which specifically includes the following steps:

[0043] (1) Preparation of phyllosilicate suspension: add 100 to 500 parts by weight of water to 1 to 20 parts by weight of phyllosilicate, and stir at a temperature of 50 to 95° C. for 1 to 6 hours to obtain a suspension of phyllosilicate. suspension;

[0044] (2) Preparation of low molecular weight chitosan solution: 1~20 parts by weight of low molecular weight chitosan is dissolved in 100~500 parts by weight of concentration in the acidic solution of 1~8% (volume ratio), adjust the pH value to 3~ 6, obtain chitosan acidic solution;

[0045] (3) Preparation of chitosan / layered silicate intercalation complex: the layered silicate suspension obtained in the above (1) and the chitosan obtained in the above (2) The ac...

Embodiment 2

[0064] The present embodiment provides a kind of preparation method of chitosan / phyllosilicate nanocomposite porous crosslinked microsphere adsorbent, specifically comprises the following steps:

[0065] (1) Add 5 g of montmorillonite to 150 ml of deionized water, and stir for 6 hours at a temperature of 50° C. to obtain a suspension of montmorillonite;

[0066] (2) mix with the montmorillonite suspension with chitosan acetic acid solution with the same volume as the montmorillonite suspension, the molecular weight is 27,000, the degree of deacetylation is 94.2%, and the concentration is 3% (wt%), adjusting the pH value of the mixed solution to 3.8; stirring at a temperature of 40° C. for 8 hours to obtain a chitosan / montmorillonite intercalation complex solution;

[0067] (3) Weigh 4.8g of chitosan with a molecular weight of 710,000 and a degree of deacetylation of 92.3, dissolve it in the compound solution in (2) above, stir at 50°C for 5 hours, cool to room temperature and ...

Embodiment 3

[0072] The present embodiment provides a preparation method of chitosan / layered silicate nanocomposite porous crosslinked microsphere adsorbent, which is specifically carried out according to the following steps:

[0073] (1) Add 4 g of kaolin to 125 ml of deionized water, and stir for 5 hours at a temperature of 60° C. to obtain a kaolin suspension;

[0074] (2) the chitosan acetic acid solution that is 27,000, the degree of deacetylation is 95.2%, and the concentration is 2% (wt%) is mixed with the kaolin suspension with the molecular weight of the same volume as the kaolin suspension, and the pH value of the adjustment is 4.8, stirring at a temperature of 50° C. for 6 hours to obtain a chitosan / kaolin intercalation complex solution;

[0075] (3) Take by weighing 3.8g, molecular weight is 650,000, the chitosan that deacetylation degree is 91.3 is dissolved in the described complex solution that makes in above-mentioned (2), after stirring 4 hours at 60 ℃ of temperature, cool...

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Abstract

The invention discloses a chitosan/layered silicate nano composite porous crosslinked microsphere adsorbent and a preparation method thereof; in the adsorbent, the layered silicate which is in nano-state is dispersed in the chitosan microsphere which is treated with chemical crosslinking. The preparation method is as follows: the chitosan with low molecular weight/ layered silicate intercalation solution is prepared, the intercalation solution is blended with the chitosan with high molecular weight and is contacted with alkaline coagulant to prepare the microsphere, the microsphere is treated with pre-crosslinking and crosslinking, acid solution is used for removing pre-crosslinking agent to obtain the chitosan/layered silicate nano composite porous crosslinked microsphere adsorbent. By comprehensively utilizing the characters of chitosan and layered silicate in terms of adsorption property and jointly applying intercalation composition, solidification and granulation by alkali solution, and pre-crosslinking and crosslinking techniques, a porous microsphere adsorbent which has low price and excellent adsorption performance for heavy metal ions and organic pollutants can be prepared.

Description

technical field [0001] The invention relates to a preparation technology of an adsorbent material, in particular to a chitosan / phyllosilicate nanocomposite porous crosslinked microsphere adsorbent material and a preparation method thereof. Background technique [0002] Wastewater containing heavy metal substances such as mercury, lead, cadmium, nickel, selenium, arsenic, chromium, thallium, bismuth, vanadium, gold, platinum, silver, etc. exceeding the standard is called heavy metal sewage. Heavy metal sewage generally comes from mining and smelting processes, industrial waste, tannery wastewater, textile factory wastewater, electroplating wastewater and battery industrial wastewater, domestic garbage (such as batteries, cosmetics). Heavy metal sewage has direct physiological toxicity to humans and animals; irrigation of crops with water containing heavy metals can pollute crops with heavy metals, resulting in toxic agricultural products; deposited on the bottom of rivers and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/10B01J20/30
Inventor 石光陈锦龙成文张力侯琼
Owner SOUTH CHINA NORMAL UNIVERSITY
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