Preparation method of fly ash and chitosan composite particle adsorbing material

A technology of composite particles and adsorption materials, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve the problems of limited application and insufficient adsorption performance of fly ash, and achieve significant hydrophilicity, Realize the effect of resource utilization and low production cost

Inactive Publication Date: 2018-11-27
深圳中天景程环保咨询有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is that traditional fly ash has insufficient adsorption performance, and its application in wastewater treatment, especially wastewater treatment containing heavy metal ions, is limited. Preparation method of functionalized fly ash-chitosan composite particle adsorption material with good adsorption performance for heavy metal ions

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  • Preparation method of fly ash and chitosan composite particle adsorbing material
  • Preparation method of fly ash and chitosan composite particle adsorbing material
  • Preparation method of fly ash and chitosan composite particle adsorbing material

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Experimental program
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Embodiment 1

[0034] The present embodiment provides a kind of preparation method of fly ash-chitosan composite particle adsorption material, and it comprises the steps:

[0035] S1. Take fly ash from a thermal power plant, remove impurities and dry it, pass through a 200-mesh sieve, and use 2.5mol / L hydrochloric acid as an activator to activate the fly ash: mix fly ash and hydrochloric acid solution according to 1 : The volume ratio of 6 was stirred and activated at a stirring speed of 80r / min for 3.5h at 70°C to obtain activated fly ash.

[0036] S2. Wash the activated fly ash obtained after the activation treatment with deionized water to neutrality, then settle naturally in deionized water, separate the upper layer of suspended fly ash after the sedimentation, take the lower layer of settled fly ash, filter and dry, and obtain Heavy activated fly ash, the density of the heavy activated fly ash is 1.9cm 3 / g, the specific surface area of ​​fly ash before activation is about 3.0~5.2m 2 ...

Embodiment 2

[0047] The present embodiment provides a kind of preparation method of fly ash-chitosan composite particle adsorption material, and it comprises the steps:

[0048] S1, get fly ash from thermal power plant, after removing impurity and drying, cross 200 mesh sieves, adopt the sulfuric acid of 1mol / L as activator, carry out activation treatment to fly ash: fly fly ash and sulfuric acid solution according to 1: The volume ratio of 2 was stirred and activated at 100° C. at a stirring speed of 100 r / min for 1 hour to obtain activated fly ash.

[0049] S2. Wash the activated fly ash obtained after the activation treatment with deionized water to neutrality, then settle naturally in deionized water, separate the upper layer of suspended fly ash after the sedimentation, take the lower layer of settled fly ash, filter and dry, and obtain Heavy activated fly ash, the density of the heavy activated fly ash is 1.9cm 3 / g, the specific surface area of ​​fly ash before activation is about ...

Embodiment 3

[0059] The present embodiment provides a kind of preparation method of fly ash-chitosan composite particle adsorption material, and it comprises the steps:

[0060] S1, get fly ash from thermal power plant, after removing impurity and drying, cross 200 mesh sieves, adopt the sulfuric acid of 5mol / L, hydrochloric acid mixed solution as activator (the volume ratio of described sulfuric acid, hydrochloric acid is 1:1), Activate the fly ash: stir and activate the fly ash, sulfuric acid and hydrochloric acid mixed liquid solution at a volume ratio of 1:10 at 20°C for 6 hours at a stirring speed of 50r / min to obtain activated fly ash.

[0061] S2. Wash the activated fly ash obtained after the activation treatment with deionized water to neutrality, then settle naturally in deionized water, separate the upper layer of suspended fly ash after the sedimentation, take the lower layer of settled fly ash, filter and dry, and obtain Heavy activated fly ash, the density of the heavy activat...

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Abstract

The invention discloses a preparation method of fly ash and chitosan composite particle adsorbing material. Fly ash is used as a raw material that is activated before separation; as the fly ash has good pore structure and rich hydroxy radicals may occur to the surface of fly ash particles during hydration reaction, the fly ash can gain significant hydrophilicity, adsorbability and surface chemicalactivity; functionalized fly ash is prepared by modification with functional groups; the functionalized fly ash and chitosan are made into particulate composite particle adsorbing material; the synergy of the functionalized fly ash and rich functional groups (amino groups) on the surface of chitosan is given to full play, the material herein can adsorb negatively-charged heavy metal ions, such asCu2+, Ni2+, Zn2+, Pb2+, Cd2+, CrO42+, and Cr2O72+. Recycling of fly has is achieved; the specific surface area of the fly ash modified by activation may be increased by 15-20 times; the functionalized fly ash and chitosan material prepared herein can be reused through desorption, so that no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a preparation method of an adsorption material, in particular to a preparation method of a functional fly ash-chitosan composite particle adsorption material. Background technique [0002] Fly ash is the waste residue discharged from coal-fired boilers such as thermal power plants. The annual discharge in my country can reach more than 11.8 billion tons, but its utilization rate is only about 30%. resources, but also caused serious pollution to the environment. In fact, the density of fly ash is 2-216t / m 3 , bulk density is 550-658kg / m 3 , because it is formed by the pulverized coal undergoing heat absorption by the hot surface under the condition of suspended combustion and then cooling. Therefore, under the action of surface tension, the surface of fly ash is loose and porous, with a large specific surface area and adsorption characteristics. Through its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/103B01J20/24B01J20/28019C02F1/281C02F1/286C02F2101/20C02F2101/22
Inventor 汪乐燕梅立永王波庄艺璇王磊薛燕刘欢
Owner 深圳中天景程环保咨询有限公司
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