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Modified starch-chitosan copolymer flocculating agent and preparation method thereof

A chitosan copolymer and flocculant technology, applied in the field of modified starch-chitosan copolymer flocculant and its preparation, can solve the problems of low solubility and poor flocculation performance, and achieve strong applicability and excellent environmental friendliness. sexual effect

Inactive Publication Date: 2012-07-25
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both starch and chitosan have disadvantages such as low solubility at room temperature and poor flocculation performance, so we usually use them after modification.

Method used

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  • Modified starch-chitosan copolymer flocculating agent and preparation method thereof
  • Modified starch-chitosan copolymer flocculating agent and preparation method thereof
  • Modified starch-chitosan copolymer flocculating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one, with the non-ionic modified starch prepared by graft polymerization with acrylamide: chitosan mass ratio is 2: 1, at 75 ℃, reaction 12h, initiator initiator cerium ammonium nitrate consumption accounts for total mass When it is 0.5%, it is prepared, dried and crushed to 200 mesh for later use. Through the flocculation test of the dye wastewater (1L) prepared in the laboratory, the chromaticity is 1000 times, and the decolorization rate reaches 90%. The situation of the added quality is shown in Table 1.

[0029] The situation of adding quality is shown in (Table 1)

[0030]

Embodiment 2

[0031] Embodiment two, with the anionic modified starch prepared with phosphate: chitosan mass ratio is 1: 1, at 75 ℃, reacted 16h, when initiator initiator ammonium cerium nitrate consumption accounts for 0.5% of total mass, Prepared, dried and crushed to 200 mesh for later use. See Table 2 for the quality of flocculant added to achieve 99% ion removal rate by testing the ion-containing wastewater (1 L) with an average concentration of 100 mg / L.

[0032]

Embodiment 3

[0033] Embodiment three, with the amphoteric modified starch prepared by sodium tripolyphosphate as esterification agent and urea as catalyst: chitosan mass ratio is 4: 1, at 75 DEG C, reaction 18h, initiator cerium ammonium nitrate consumption accounts for When the total mass is 1%, it is prepared, dried and crushed to 200 mesh for later use. Through the flocculation test on 1L of industrial wastewater containing complex ions (including anions and cations) with a concentration of 100mg / L, see Table 3 for the quality of the dosing to achieve 90% chroma removal and 90% suspended solids removal.

[0034]

[0035] Through the above examples, compared with conventional inorganic flocculants and organic flocculants, it has obvious advantages in the removal of the chromaticity of wastewater, the removal of heavy metal ions, and the removal of suspended solids in water; compared with simple modified starch and chitosan Compared with sugar flocculants, copolymer flocculants can bet...

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Abstract

The invention relates to a modified starch-chitosan copolymer flocculating agent and a preparation method thereof. The flocculating agent and the method are characterized in that: modified starch and chitosan are adopted as raw materials; ammonium cerium nitrate is adopted as an initiator; and the modified starch / chitosan copolymer flocculating agent is synthesized under an alkaline condition. In the steps, the mass ratio of the modified starch to chitosan is (1-4):1, the reaction temperature is 45-90 DEG C, a reaction time is 12-16h, and the initiator accounts for 0.1-1% of a total mass of the system. With the method provided by the invention, the prepared modified starch / chitosan copolymer flocculating agent is highly efficient, cheap, and environment-friendly. With the modified starch / chitosan copolymer flocculating agent, heavy metal ions can be removed. Compared with common flocculating agents, aiming at different sewages, wastewater decolourization rate, wastewater turbidity removal rate, and heavy metal removal rate are higher than 99% with a small dosage.

Description

technical field [0001] The invention relates to a modified starch-chitosan copolymer flocculant and a preparation method thereof, belonging to the technical field of water treatment flocculation. Background technique [0002] Domestically commonly used water treatment flocculants are mainly divided into two categories: inorganic flocculants and organic flocculants. Inorganic flocculants are mainly polyaluminum chloride and polyferric chloride-based flocculants. The principle is to agglomerate and bridging flocculate the hydrolyzed products to form settleable or filterable flocs to achieve the goal of purifying water quality. Purpose. However, the iron-containing flocculant brings iron ions into the system, which is easy to cause corrosion of equipment, and there are trace iron ions in the treated water, which has a certain chroma. The treatment effect of aluminum-containing flocculants is slightly better than that of iron-type flocculants, but the high residual aluminum io...

Claims

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Application Information

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IPC IPC(8): C08G81/00C02F1/56
Inventor 孙磊夏东升龙学军阮新潮
Owner WUHAN TEXTILE UNIV
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