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Shell powder and chitosan composite microspheres for absorbing heavy metals, and preparation method of shell powder chitosan composite microspheres

A technology for adsorbing heavy metals and composite microspheres, applied in alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc. , to achieve the effect of improving complexing ability, high mechanical strength and increasing mechanical stability

Active Publication Date: 2018-04-24
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan has low specific gravity and mechanical strength, and is unstable to acid and alkali, which limit its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A shell powder-chitosan composite microsphere for adsorbing heavy metals, the weight ratio of chitosan powder and shell powder in the composite microsphere is 1:0.3-0.45, and the diameter of the composite microsphere is 0.4-0.6mm.

[0020] A method for preparing shell powder-chitosan composite microspheres adsorbing heavy metals, comprising preparation of coarse shell powder, preparation of nano-shell powder, preparation of composite microspheres, and modification of composite microspheres, specifically comprising the following steps:

[0021] 1) Preparation of coarse shell powder: clean the shells, soak them in dilute acid solution for 4-5 hours, then neutralize and wash them with dilute lye to remove impurities on the surface of the shells, finally wash them with water, dry them, and heat them at 900-1000°C Calcined at low temperature for 2-3 hours, cooled to room temperature, and passed through a 150-200 mesh sieve after grinding to obtain coarse shell powder;

[002...

Embodiment 2

[0028] A shell powder chitosan composite microsphere for adsorbing heavy metals, the weight ratio of chitosan powder and shell powder in the composite microsphere is 1:0.45, and the diameter of the composite microsphere is 0.4-0.6mm.

[0029] A preparation method of shell powder chitosan composite microspheres adsorbing heavy metals, specifically comprising the following steps:

[0030] 1) Preparation of coarse shell powder: clean the shells, soak them in dilute acid solution for 5 hours, then neutralize and wash them with dilute lye to remove impurities on the surface of the shells, finally wash them with water, dry them, and then calcinate them at 900°C for 3 hours. Cool to room temperature, grind and pass through a 150-mesh sieve to obtain coarse shell powder;

[0031] 2) Preparation of nano-shell powder: add a crushing and dispersing agent of 2.2% of the weight of the coarse shell powder to the coarse shell powder, and then use a nano-pulverizer to crush to obtain nano-she...

Embodiment 3

[0037] A shell powder chitosan composite microsphere for adsorbing heavy metals, the weight ratio of chitosan powder and shell powder in the composite microsphere is 1:0.38, and the diameter of the composite microsphere is 0.4-0.6mm.

[0038] A method for preparing shell powder-chitosan composite microspheres adsorbing heavy metals, comprising preparation of coarse shell powder, preparation of nano-shell powder, preparation of composite microspheres, and modification of composite microspheres, specifically comprising the following steps:

[0039] 1) Preparation of coarse shell powder: clean the shells, soak them in dilute acid solution for 4.5 hours, then neutralize and wash them with dilute lye to remove impurities on the surface of the shells, finally wash them with water, dry them, and then calcinate them at 950°C for 2.5 hours. h, cooled to room temperature, and passed through a 180-mesh sieve after grinding to obtain coarse shell powder;

[0040] 2) Preparation of nano-sh...

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Abstract

The invention discloses shell powder and chitosan composite microspheres for absorbing heavy metals, and a preparation method of the shell powder chitosan composite microspheres. In the composite microspheres, the weight ratio of chitosan powder to shell powder is equal to 1 to (0.3-0.45). The preparation method comprises the steps of soaking shell into acid, washing, drying, calcining, and grinding into coarse shell powder; crushing the coarse shell powder to obtain nano shell powder; carrying out liquid drop molding on the chitosan powder and the shell powder, then carrying out crosslinkingmodification, cleaning up, and drying to obtain composite microspheres; adding the composite microspheres into a solution containing thiourea and epoxy chloropropane, and carrying out a reaction to obtain a composite microsphere product. The shell powder and chitosan composite microspheres provided by the invention combines the advantages of the shell powder and chitosan; due to the addition of the shell powder, not only is the mechanical stability of a chitosan carrier improved, but the complexing capability between the carrier and transition metals can be also improved, and the recycling ofthe heavy metals can be further realized; the microspheres prepared by the preparation method provided by the invention have high monodispersity, and are controllable in particle sizes, morphology, particle diameters and components, uniform in particle diameters and high in mechanical strength.

Description

technical field [0001] The invention relates to the technical field of environmental protection materials, in particular to shell powder chitosan composite microspheres for absorbing heavy metals and a preparation method thereof. Background technique [0002] With the development of the economy, heavy metal wastewater (containing chromium, cadmium, copper, mercury, nickel, zinc and other heavy metal ions) produced in industrial production processes such as mining and metallurgy, machinery manufacturing, chemical industry, electronics, and instrumentation is the most serious and serious water pollution. One of the most harmful industrial wastewater to human beings. Heavy metals in wastewater cannot be decomposed and destroyed by various common water treatment methods, but can only transfer their existing locations and change their physical and chemical states. Therefore, heavy metal wastewater should be treated at the place where it is generated and not mixed with other wast...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28021B01J2220/4825C02F1/286C02F2101/20
Inventor 刘艳萍刘先勇陈庆国李世杰
Owner ZHEJIANG OCEAN UNIV
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