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Beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent and use thereof

A magnetic nanometer and magnetic nanoparticle technology, which can be used in adsorption water/sewage treatment, other chemical processes, chemical instruments and methods, etc., can solve the problems of difficult separation and recovery, waste of resources, secondary pollution, etc., and achieve good solubility, The effect of small internal mass transfer resistance and strong adsorption capacity

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some conventional adsorbents such as biochar and powdered activated carbon use a large amount, and it is often difficult to separate and recover organic dyes after adsorption and removal, which is likely to cause waste of resources and secondary pollution.

Method used

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  • Beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent and use thereof
  • Beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent and use thereof
  • Beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: β-cyclodextrin functionalized Fe 3 o 4 Preparation of Magnetic Nanosorbents

[0032] (1) Fe 3 o 4 Preparation of Magnetic Nanoparticles (MNPs)

[0033] Weigh FeCl with a molar ratio of 1:1 2 .4H 2O and FeCl 3 .6H 2 O (total iron concentration 0.3mol / L) is placed in a 250mL round-bottomed flask, add an appropriate amount of twice distilled water 200mL, heat to 80°C, stir rapidly and add 25% ammonia water dropwise to pH 10, cool to room temperature after aging for 30min, Wash three times with double distilled water and 117 mg / mL NaCl solution, separate by permanent magnet, and then dry in a vacuum oven (50°C) to obtain MNP powder.

[0034] Characterized by X-ray diffraction technique, it can be seen from the figure that the peaks at 2θ at 30.2, 35.6, 43.2, 53.7, 57.2 and 62.9 correspond to the face-centered cubic Fe 3 o 4 The (220), (311), (400), (422), (511) and (440) diffraction planes, and the standard Fe in JCPDS (No.85-1436) 3 o 4 The phases of...

Embodiment 2

[0049] Example 2: β-cyclodextrin functionalized Fe 3 o 4 Adsorption of Methylene Blue (MB) by Magnetic Nanosorbent

[0050] Take 9.6mg Fe functionalized with β-cyclodextrin 3 o 4 Magnetic nano-adsorbent, add it to 5mL aqueous solution containing methylene blue at a concentration of 0.02mg / mL, adjust the pH of the reaction system to 8, control the temperature at 25°C, ultrasonically disperse for 1 hour, and then fully shake for 8-10 hours. Under the action of an external magnetic field, the fully reacted magnetic nano-adsorbent is separated from the reaction solution, and the supernatant is absorbed at the maximum absorption wavelength of MB at 664nm for ultraviolet spectrum measurement, thereby inferring the content of MB adsorbed by β-CD-MNP .

[0051] Then the same amount of β-CD-MNP (9.6 mg) was added to 5 mL of MB aqueous solution containing different concentrations, the adsorption conditions and adsorption method were the same as above, and the adsorption effect on MB...

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Abstract

The invention provides a beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent. The beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent is prepared through a lay-by-lay assembling method. The beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent has good stability, good dissolvability and strong adsorption capability. The beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent has strong effects of adsorbing azo dyes such as methylene blue, methylene red and the like in waste water. The invention also provides a method for removing methylene blue in waste water. The method comprises the following steps of putting the beta-cyclodextrin functionalized Fe3O4 magnetic nanometer adsorbent into an aqueous solution containing methylene blue, adjusting a pH value of the reaction system to a pH value of 7 to 8, carrying out ultrasonic dispersion for 0.5 to 1 hour, carrying out oscillation for 8 to 10 hours, and separating out precipitates by a permanent magnet. The method for removing methylene blue in waste water has the advantages of good adsorption effects, mild reaction, simple processes, simplification of solid-liquid separation, less secondary pollution and good feasibility for large-scale application.

Description

technical field [0001] The invention relates to magnetic nanomaterials and applications thereof, in particular to a β-cyclodextrin functionalized Fe 3 o 4 Magnetic nano-adsorbent, and a method for removing methylene blue in waste water with the adsorbent. Background technique [0002] With the vigorous development of the textile printing and dyeing industry, the organic dye wastewater discharged by it has become a major killer that threatens the living environment of human beings. Organic dye wastewater not only has high chroma and affects the growth of aquatic organisms, but most dyes are also biologically toxic. The transfer of these toxic substances through the food chain will directly cause varying degrees of damage to the human body. As an important organic synthetic ionic dye, methylene blue is widely used in the printing and dyeing industry. The discharge of industrial wastewater containing methylene blue will cause serious pollution to other pure water bodies. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62C02F103/30C02F101/38
Inventor 董川王海霞周叶红双少敏
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