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Rhodamine B-grafted chitosan adsorbent and preparation and application thereof

A chitosan and adsorbent technology, which is applied in the field of adsorption material preparation technology, can solve the problems of endangering human life safety, high toxicity, and not easy to degrade, and achieves improved adsorption capacity and selectivity, good reproducibility, and enrichment. Multiplier effect

Inactive Publication Date: 2016-08-03
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Due to the different types, contents and forms of heavy metal ions, and the characteristics of not being easy to degrade and being highly toxic, it seriously pollutes water bodies and seriously endangers human life.

Method used

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  • Rhodamine B-grafted chitosan adsorbent and preparation and application thereof
  • Rhodamine B-grafted chitosan adsorbent and preparation and application thereof
  • Rhodamine B-grafted chitosan adsorbent and preparation and application thereof

Examples

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Embodiment 1

[0023] Preparation of rhodamine B grafted chitosan adsorbent

[0024] (1) Synthesis of rhodamine B hydrazide: first dissolve 2.5mmol rhodamine B in 30mL ethanol, add 3mL (excess) hydrazine hydrate (85%, v / v) dropwise at room temperature, and stir vigorously at the same time; heat to reflux 2h, until the dark purple color becomes orange and transparent, then cool, and remove the solvent under reduced pressure; then add 50mL of 1M HCl to dissolve the solid, then slowly add 70mL of 1M NaOH, and stir until the pH reaches 9~10; the resulting precipitate is washed 3 times with water and dried , and finally get a pink solid;

[0025] (2) Rhodamine hydrazide grafted to chitosan: Dissolve 1 g of rhodamine B hydrazide synthesized in step (1) in 50 mL of methanol, then add 2 mL of glyoxal and 2 g of chitosan in turn, stir, and 2 The reaction was refluxed in the environment for 8 hours, and after cooling to room temperature, the obtained solid was washed three times with methanol and wat...

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Abstract

The invention discloses a rhodamine B-grafted chitosan adsorbent and preparation and application thereof, and belongs to the field of adsorbing material preparation technologies. Preparation of the adsorbent comprises the steps that rhodamine B reacts with hydrazine hydrate to prepare rhodamine B hydrazide; rhodamine B hydrazide is grafted to chitosan by taking glyoxal as a cross-linking agent to obtain the adsorbent. According to the rhodamine B-grafted chitosan adsorbent, through the adsorptivity of chitosan and rhodamine B, bonding is firm, the property is stable, the selectivity is good, and the enrichment factor is large. The adsorbent can be used for adsorption and detection of mercury ions in an environmental water sample.

Description

technical field [0001] The invention belongs to the field of adsorption material preparation technology, and in particular relates to a rhodamine B grafted chitosan adsorbent and its preparation and application. Background technique [0002] Due to the different types, contents and forms of heavy metal ions, and the characteristics of being difficult to degrade and highly toxic, they seriously pollute water bodies and seriously endanger human life. Mercury is a transition metal element and also a very toxic heavy metal element. Since mercury cannot be decomposed by microorganisms in the environment, and mercury can spontaneously accumulate in organisms, and combine with organic matter inside organisms under certain conditions, it will be transformed into more toxic organic mercury. Therefore, mercury produced in the environment Pollution is very serious. Since the Minamata disease broke out in Japan in 1956, people have gained a deeper understanding of mercury pollution an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28G01N1/40
CPCB01J20/24C02F1/286G01N1/405
Inventor 吕海霞范经爽谢增鸿
Owner FUZHOU UNIV
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