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Preparation method and application of chitosan-shell powder compound adsorbent

A composite adsorption and shell powder technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve problems such as poor interface bonding of composites, increased use of chemical reagents, and impact on adsorption performance, etc., to achieve The effect of good economic and social benefits, low cost, and excellent adsorption performance

Inactive Publication Date: 2017-06-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor compatibility of chitosan and inorganic substrates, the interfacial bonding of the resulting composites is poor, which affects the adsorption performance.
Organic modification of the substrate can improve the compatibility, thereby improving the adsorption performance, such as the patent "production method of environmentally friendly chitosan intercalation composite bentonite adsorbent" (application number CN201010107961.4), but increases the use of chemical reagents , which also complicates the preparation process

Method used

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  • Preparation method and application of chitosan-shell powder compound adsorbent
  • Preparation method and application of chitosan-shell powder compound adsorbent
  • Preparation method and application of chitosan-shell powder compound adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1) Wash the discarded mussel shells to remove the residual meat;

[0030] 2) calcining the mussel shells from which the flesh has been removed at 150° C., and pulverizing them to obtain shell powder;

[0031] 3) mixing 1 mass part of shell powder with 20 mass parts of water and stirring to prepare a shell powder suspension;

[0032] 4) The chitosan of 1 mass part is mixed with the mass concentration of 100 mass parts of 0.1% hydrochloric acid, stirred, and prepared chitosan solution;

[0033] 5) under rapid stirring, chitosan accounts for 5% of shell powder mass, chitosan solution is slowly added dropwise in the shell powder suspension, and chitosan is separated out on the surface of shell powder;

[0034] 6) Filter with a sieve, rinse the filtrate with water, and wash away the calcium salt generated by the reaction;

[0035] 7) The filtrate after washing with water is dried at 40° C. and ground to obtain a chitosan-shell powder composite adsorbent.

[0036] from fi...

Embodiment 2

[0038] 1) Washing the discarded scallop shells to remove residual meat;

[0039] 2) calcining the scallop shells from which the flesh has been removed at 400° C., and pulverizing them to obtain shell powder;

[0040] 3) mixing 1 mass part of shell powder with 100 mass parts of water and stirring to prepare shell powder suspension;

[0041] 4) the chitosan of 5 mass parts is mixed with the mass concentration of 100 mass parts of 10% citric acid, stirred, and prepared chitosan solution;

[0042] 5) under rapid stirring, according to chitosan accounts for 10% of shell powder mass, chitosan solution is slowly added dropwise in the shell powder suspension, and chitosan is separated out on the surface of shell powder;

[0043] 6) Filter with a sieve, rinse the filtrate with water, and wash away the calcium salt generated by the reaction;

[0044] 7) The filtrate after washing with water is dried at 100° C. and ground to obtain a chitosan-shell powder composite adsorbent.

[0045]...

Embodiment 3

[0047] 1) Wash the discarded oyster shells to remove the residual meat;

[0048] 2) calcining the oyster shells from which the flesh has been removed at 380° C., and pulverizing them to obtain shell powder;

[0049] 3) mixing 1 mass part of shell powder with 60 mass parts of water and stirring to prepare shell powder suspension;

[0050] 4) 2 mass parts of chitosan and 100 mass parts of oxalic acid with a mass concentration of 5% are mixed and stirred to prepare a chitosan solution;

[0051] 5) under rapid stirring, chitosan accounts for 15% of shell powder mass, chitosan solution is slowly added dropwise in the shell powder suspension, and chitosan is separated out on the surface of shell powder;

[0052] 6) Filter with a sieve, rinse the filtrate with water, and wash away the calcium salt generated by the reaction;

[0053] 7) The filtrate after washing with water is dried at 70° C. and ground to obtain a chitosan-shell powder composite adsorbent.

[0054] from image 3 ...

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Abstract

The invention discloses a preparation method and application of a chitosan-shell powder compound adsorbent. The preparation method mainly comprises the following steps: (1) calcining shells without meat at low temperature, and crushing to obtain shell powder; (2) mixing the shell powder with water to prepare suspension liquid; (3) mixing chitosan with dilute acid to prepare a chitosan solution; (4) dropwise adding the chitosan solution into the shell powder suspension liquid while stirring at high speed so as to enable the chitosan to be separated out at the surface of the shell powder; (5) filtering with bolting cloth, and then washing material, obtained by filtering, with water; (6) drying, and grinding to obtain the chitosan-shell powder compound adsorbent. The preparation method provided by the invention is wide in material source, simple in technology and mild in operation conditions; the prepared adsorbent has excellent adsorption performance for Congo red dye, and is low in cost and environment-friendly, thus having good economic and social benefits.

Description

technical field [0001] The invention relates to the field of dye wastewater treatment, in particular to a preparation method and application of a chitosan-shell powder composite adsorbent. Background technique [0002] In the treatment process of dye wastewater, adsorption is a simple and cost-effective method, and the development of green and cheap biosorbents is receiving more and more attention. As the largest natural organic compound after cellulose on the earth, chitin is widely found in crustaceans, insects and fungi. Chitosan is the product of partial deacetylation of chitin. With its rich functional group composition, biocompatibility, biodegradability and non-toxicity, chitosan shows a strong adsorption capacity for dyes. It is used in dye wastewater treatment It has a good application prospect. However, chitosan has low specific gravity and mechanical strength, and is unstable to acid and alkali, which limit its application. [0003] In order to improve the perf...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/30C02F101/34C02F101/38
CPCB01J20/24B01J20/043B01J20/28011B01J2220/4825B01J2220/4881C02F1/288C02F2101/308C02F2101/34C02F2101/38C02F2101/40
Inventor 葛柳钦夏枚生范能周佑洲杨文叶张维睿叶瑛
Owner ZHEJIANG UNIV
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