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Magnetic meso-porous silicon, preparation method of magnetic meso-porous silicon, magnetic meso-porous silicon adsorbent, preparation method and application of magnetic meso-porous silicon adsorbent

A mesoporous silicon and adsorbent technology, applied in the field of magnetic mesoporous silicon, preparation, magnetic mesoporous silicon adsorbent, can solve the problems of surfactant and transfer agent toxicity, uneven magnetic distribution, long preparation time, etc. The effect of reducing diffusion resistance, uniform magnetic distribution, and stable physical and chemical properties

Inactive Publication Date: 2014-04-16
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent application number is: 201310123923.1 discloses a synthetic method of magnetic mesoporous silicon, the steps are, dissolving 1.30g-1.40g hexahydrate and ferric chloride in 70-80ml ethylene glycol, stirring until clarification, and Add 3.4-3.8g of sodium acetate to the above product, stir until clarified and continue to stir for 1-3 hours, then transfer the above product to a reaction kettle after ultrasonication for 5 minutes, react at 200°C for 16 hours, and fully wash to obtain magnetic mesoporous silicon. The preparation of magnetic mesoporous silicon takes a long time, and the magnetic preparation and the synthesis of mesoporous silicon are carried out step by step without synchronization. Due to the agglomeration of ferroferric oxide, the magnetic distribution is uneven. In order to solve this problem, it is necessary to add surface active Surfactants and transfer agents are toxic and prone to contamination

Method used

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  • Magnetic meso-porous silicon, preparation method of magnetic meso-porous silicon, magnetic meso-porous silicon adsorbent, preparation method and application of magnetic meso-porous silicon adsorbent
  • Magnetic meso-porous silicon, preparation method of magnetic meso-porous silicon, magnetic meso-porous silicon adsorbent, preparation method and application of magnetic meso-porous silicon adsorbent
  • Magnetic meso-porous silicon, preparation method of magnetic meso-porous silicon, magnetic meso-porous silicon adsorbent, preparation method and application of magnetic meso-porous silicon adsorbent

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Experimental program
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Effect test

Embodiment 1

[0032] Preparation method of magnetic mesoporous silicon

[0033] 1. Synthesis of mesoporous composites

[0034] Preparation by soft template method: prepare 200mL of 0.1mol / L hydrochloric acid solution, add 4g of F-127 block copolymer (purchased from sigma-Aldrich) to it, and stir mechanically; add 35.2g of ferrous ammonium sulfate, and stir until dissolved ; Then add 18.6g ethyl orthosilicate. Stir mechanically for 8 hours in an ice-water bath to obtain a clear solution; add the above mixed solution into a digestion tank, and conduct a hydrothermal reaction at 100° C. for 24 hours; collect solid matter by centrifugation.

[0035] 2. Preparation of magnetic mesoporous silicon

[0036] Under the condition of 60°C water bath, the above mesoporous composite was immersed in 300mL of sodium hydroxide solution with a concentration of 0.1mol / L, and 350μL of hydrogen peroxide solution with a mass concentration of 30% was added to oxidize ferrous iron into tetraoxide Three irons, g...

Embodiment 2

[0042] Removal of hexavalent chromium from water by magnetic mesoporous silica adsorbent

[0043] Add 8 mg of magnetic mesoporous silicon adsorbent to 10 ml of a solution containing hexavalent chromium with a concentration of 100 mg / L, adjust the pH to 2, shake at room temperature at 150 rpm for 410 min, and the removal rate of hexavalent chromium is 92%. Then, the above-mentioned magnetic mesoporous silicon adsorbent adsorbed with hexavalent chromium was added to a sodium hydroxide solution with a concentration of 0.01 mol / L, desorbed by shaking for 3 hours, centrifuged, and washed until neutral to obtain a magnetic mesoporous silicon adsorbent. The polyaniline grafted on the magnetic mesoporous silicon adsorbent can reduce hexavalent chromium to trivalent chromium, and since the toxicity of trivalent chromium is obviously lower than that of hexavalent chromium, the toxicity of pollutants can be reduced.

Embodiment 3

[0045] Removal rate of hexavalent chromium by magnetic mesoporous silica adsorbent under different conditions

[0046] Removal rate of hexavalent chromium by magnetic mesoporous silicon adsorbent under different adsorption time conditions

[0047] Set up nine groups containing 0.008g magnetic mesoporous silicon adsorbent and 10mL hexavalent chromium solution with a concentration of 100mg / L, adjust the pH value to 2, and oscillate at room temperature at 150rmp. , 410, 530min sampling, after centrifugation, use ultraviolet spectrophotometry to measure the content of hexavalent chromium in the supernatant, and calculate the removal rate. Experimental results such as image 3 As shown, under this condition, the equilibrium time for magnetic mesoporous silicon adsorbent to adsorb hexavalent chromium is 410min.

[0048] Removal rate of hexavalent chromium by magnetic mesoporous silica adsorbent under different solution pH values

[0049] Ten groups containing 0.008g magnetic meso...

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Abstract

The invention discloses magnetic meso-porous silicon. A preparation method of the magnetic meso-porous silicon comprises the steps of reacting by taking tetraethoxysilane as a silicon source, ammonium ferrous sulfate as an iron source and an F-127 block polymer as a template, separating to obtain a meso-porous compound, adding an oxidant, reacting, filtering, drying and firing to obtain the magnetic meso-porous silicon which is even in magnetic distribution. The invention also provides a magnetic meso-porous silicon adsorbent. A preparation method of the magnetic meso-porous silicon adsorbent comprises the steps of performing polymeric oxidizing reaction through the magnetic meso-porous silicon, ammonium persulfate and phenylamine under an acid condition, then washing, filtering and drying to obtain the magnetic meso-porous silicon adsorbent; and the preparation method is simple and saves the reaction time. The invention also provides an application of the magnetic meso-porous silicon adsorbent in removal of heavy metal ions in water; and the magnetic meso-porous silicon adsorbent is strong in adsorption force of heavy metals and large in adsorption capacity.

Description

technical field [0001] The invention belongs to the technical field of mesoporous silicon adsorption materials, and in particular relates to a magnetic mesoporous silicon, a preparation method, a magnetic mesoporous silicon adsorbent, a preparation method and an application. Background technique [0002] Heavy metal ions widely exist in various industrial wastewater, which are highly carcinogenic and mutagenic, and have caused serious harm to human health and the ecological environment. At present, the removal methods of heavy metal ions in water mainly include chemical precipitation, ion exchange, coagulation and adsorption. Among them, the adsorption method has attracted widespread attention due to its wide source of raw materials, simple operation, low cost and high treatment efficiency. [0003] Chinese patent application number is: 201310123923.1 discloses a synthetic method of magnetic mesoporous silicon, the steps are, dissolving 1.30g-1.40g hexahydrate and ferric ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30H01F1/00C02F1/28C02F101/20
Inventor 汤琳方艳曾光明周耀渝王佳佳张盛杨贵德陈俊蔡叶黎思思
Owner HUNAN UNIV
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