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Method for preparing environment-friendly starch/bentonite composite material

An environment-friendly, composite material technology, applied in the field of starch/bentonite composite material preparation, can solve the problems of insufficient resistance to mechanical agitation and stability, lack of water resistance and emulsification ability, paste liquid instability, etc., and achieve improved flocculation performance , low price and low desorption rate

Active Publication Date: 2015-04-22
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural starch has a wide range of uses, but its defects such as insolubility in cold water, unstable paste, poor transparency, low gel strength, insufficient resistance to mechanical agitation and stability, lack of water resistance and emulsification ability cannot meet the performance requirements of modern industrial production

Method used

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  • Method for preparing environment-friendly starch/bentonite composite material
  • Method for preparing environment-friendly starch/bentonite composite material
  • Method for preparing environment-friendly starch/bentonite composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 100 g of calcium-based bentonite with a particle size of 200 mesh, add 1.0 L of distilled water, stir for 2 hours, let stand for stratification, discard the bottom layer of particles larger than 2 μm, and take the upper layer of bentonite suspension for subsequent use;

[0026] (2) Sodiumization: add 2.5L of 0.50mol / L NaCl solution to the bentonite aqueous solution, stir for 24 hours, and discard the supernatant after standing for stratification; then add 2.5L of 0.50mol / L NaCl solution for secondary sodiumization , stirred for 12 hours, allowed to stand for stratification, and discarded the supernatant; centrifuged the bentonite suspension at a speed of 8000rpm for 20min, poured off the supernatant, added distilled water, and repeated washing until there was no Cl- in the supernatant (using AgNO 3 Solution test (Cl-); dry the washed sample at 80°C, grind it into powder, and pass through a 100-mesh sieve to obtain purified bentonite after sodium;

[0027] (3) ...

Embodiment 2～6

[0035] Implementation method is the same as Example 1, change the granularity of calcium-based bentonite in step (1), NaCl solution concentration in step (2), cationic degree, concentration, solution pH of cationic starch in step (3), in step (4) The mass ratio of sodium bentonite to starch solution, water bath temperature, stirring time, starch content, Zeta potential and interlayer distance d of the obtained starch / bentonite composite 001 And the removal rates of methylene blue, Congo red, p-nitrophenol and Cr(VI) in water are shown in the table below.

[0036]

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Abstract

The invention relates to a method for preparing an environment-friendly starch / bentonite composite material. The method is characterized by comprising the following steps: modifying calcium-base bentonite by cation starch, namely fully dispersing the calcium-base bentonite into water, performing washing purification, adding a sodium chloride solution for sodium treatment, then uniformly dispersing the bentonite subjected to sodium treatment into the water, adding the cation starch aqueous solution with a concentration of 1 to 8g / L, controlling the mass ratio of the bentonite subjected to sodium treatment to the solution at 1: (4-8), stirring for 0.5 to 2.5 hours in the water bath at the temperature of 25 to 75 DEG C, performing solid and liquid separation on the product, washing, drying, activating, grinding, screening, and thus obtaining the starch / bentonite composite material. The environment-friendly starch / bentonite composite material is low in cost, high in performance and environment-friendly; compared with the bentonite, the starch / bentonite composite material is changed in the aspect of surface appearance, electric characteristic and interlayer space; the environment-friendly starch / bentonite composite material can remove pollutants such as dye methylene blue, Congo red, p-nitrophenol and hexavalent chromium and is applicable to waste water treatment in the environment-friendly industry.

Description

technical field [0001] The invention relates to an environment-friendly, pollution-free, non-toxic and harmless starch / bentonite composite material preparation method and application. Background technique [0002] my country is rich in bentonite resources and widely distributed in regions. The estimated resource reserves are more than 8 billion tons, ranking first in the world; the proven reserves are 2.46 billion tons, accounting for 60% of the world. Bentonite belongs to layered aluminosilicate clay minerals. It is one of the earliest developed and most widely used non-metallic minerals at home and abroad. It is known as "universal clay". Bentonite has excellent physical and chemical properties such as cation exchange, water swelling, thixotropy, dispersion suspension, adsorption, cohesiveness and plasticity, low diffusivity, low permeability, chemical stability, thermal stability, etc., and is widely used in Environmental protection, pharmaceutical excipients, catalysts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 闫良国于海琴尹蓉于洁杜斌
Owner UNIV OF JINAN
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