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A recyclable magnetic chitosan phthalocyanine catalyst and its application

A chitosan and catalyst technology, applied in the field of magnetic chitosan phthalocyanine catalyst and its application, can solve the problems of complex synthesis process, use of additional light source, difficult recycling, etc., achieve simple synthesis steps, reduce the chroma of waste water, The effect of stabilizing physical properties

Active Publication Date: 2019-10-29
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the above-mentioned technical problems in the prior art, the invention provides a kind of recyclable magnetic chitosan phthalocyanine catalyst and application, described this recyclable magnetic chitosan phthalocyanine catalyst and application will solve existing The synthesis process in the technology is complicated, the degradation requires the use of additional light sources, and the technical problems are not easy to recycle

Method used

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  • A recyclable magnetic chitosan phthalocyanine catalyst and its application
  • A recyclable magnetic chitosan phthalocyanine catalyst and its application
  • A recyclable magnetic chitosan phthalocyanine catalyst and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1. Weigh 7.4 g of trimellitic anhydride, 1.363 g of cobaltous chloride, 15.015 g of urea, 0.148 g of ammonium molybdate, and 1.15 g of ammonium chloride into a three-necked flask, heat up to 120 °C and reflux for 2 hours, then heat up to 180 °C Keep warm for 6 hours.

[0039] Step 2. After cooling to room temperature, soak the obtained solid with 1mol / L hydrochloric acid for 5 hours, then pour the solution into water, filter, wash the filtered solid with deionized water 2 to 3 times, dry and collect.

[0040] Step 3. Weigh 5 g of the sample collected in step 2 and dissolve it in 200 ml of 2 mol / L sodium hydroxide saturated sodium chloride solution. After the solution is completely dissolved, heat the solution to 98 °C and heat under reflux for 8 hours.

[0041] Step 4. Suction filter the hydrolyzed reaction solution, add hydrochloric acid to the filtrate to adjust the pH to 2, and let stand to separate the obtained precipitate. The precipitate was washed with wate...

Embodiment 2

[0045] Add 0.1 g tetracarboxyphthalocyanine cobalt-chitosan magnetic powder into 200 mL of 50 ppm methylene blue solution, and stir at room temperature in the dark to make the catalyst and solution reach adsorption equilibrium. Afterwards, air was blown into the solution, and the stirring was continued under the irradiation of a fluorescent lamp. Measure the absorbance change of the solution at the maximum absorption wavelength (at 662nm), and calculate the degradation efficiency. The UV-Vis absorption spectrum changes within 1 hour of solution degradation as image 3 Shown, when reacting 4 hours, the absorbance of methylene blue in the solution reduces to original 10%, and dyestuff degradation rate reaches 90%. Reacted for 6 hours, the degradation rate of methylene blue reached 99.8%, and the degradation rate of methylene blue changed with time as shown in the attached Figure 4 shown. The magnetic catalyst was sucked out and separated by an external magnetic field, and th...

Embodiment 3

[0047] Add 10 mL of H to 200 mL of 50 ppm methylene blue solution dropwise 2 o 2 , Stir evenly under the condition of avoiding light, then add HCl to adjust the pH to 2, and then add 0.05g of tetracarboxyphthalocyanine cobalt-chitosan magnetic powder. Stirring under the condition of avoiding light and introducing air, it was found that the degradation rate of methylene blue reached 98.6% in 5 minutes.

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Abstract

The invention provides a recyclable magnetic chitosan phthalocyanine catalyst. The recyclable magnetic chitosan phthalocyanine catalyst is prepared from a ferroferric oxide magnetic carrier coated with chitosan and tetracarboxy cobalt phthalocyanine which is loaded on the surface of the carrier and has a smooth spherical structure. The invention further provides a preparation method of the recyclable magnetic chitosan phthalocyanine catalyst; the preparation method comprises the following steps: preparing the ferroferric oxide magnetic carrier coated with the chitosan; preparing tetraacylamino cobalt phthalocyanine; preparing the tetracarboxy cobalt phthalocyanine; adding the tetracarboxy cobalt phthalocyanine into a reaction container containing dimethylformamide and stirring for sufficiently dissolving the tetracarboxy cobalt phthalocyanine; then adding ferroferric oxide magnetic carrier powder coated with the chitosan and carrying out ultrasonic dispersion; stirring and pumping out a dimethylformamide solvent; then washing and drying to obtain the recyclable magnetic chitosan phthalocyanine catalyst. The recyclable magnetic chitosan phthalocyanine catalyst is used as a catalyst for catalyzing the degradation reaction of dyestuff molecules in a water solution; the degradation efficiency is high and an auxiliary oxidant is not needed; the catalyst can be recycled through an external magnetic field.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a catalyst, in particular to a recyclable magnetic chitosan phthalocyanine catalyst and its application. Background technique [0002] Compared with homogeneous catalyst acids, heterogeneous catalysts have attracted much attention because of their advantages of separation and recovery, and no need to use co-catalysts. For many years, people have been developing and researching heterogeneous catalysts. Phthalocyanine is one of the earliest biomimetic catalytic materials discovered, and has attracted widespread attention because of its optical activity, thermal stability and high catalytic activity. And it has been applied in many organic synthesis catalysis. However, its low surface area and the need for oxidation sources such as hydrogen peroxide, as well as the difficulty in recycling, limit the wide application of phthalocyanine catalysts in industry. [0003] In order to overco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J35/08C07F15/06C02F1/30C02F1/72
CPCB01J31/2217B01J35/08B01J2531/0238B01J2531/845C02F1/30C02F1/725C02F2101/308C02F2305/10C07F15/065Y02P20/584Y02W10/37
Inventor 孙小玲陈晨马占虎徐圣乐李天奇
Owner SHANGHAI INST OF TECH
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