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Iron-carrying meso-porous silicon composite material as well as preparation method and application thereof

A silicon composite material and composite material technology, applied in the field of materials, can solve the problems of difficulty in recycling nano zero-valent iron particles, affecting the ability of dispersion and migration, large specific surface area of ​​nano iron, etc., achieving low price, short drying time, increased The effect of dispersion properties

Inactive Publication Date: 2014-12-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large specific surface area and magnetism of nano-iron, it is easy to agglomerate, resulting in a decrease in specific surface area, high surface energy and easy to be oxidized, which affects the dispersion and migration capabilities, resulting in a bottleneck in in-situ repair. At the same time, it is difficult to recover nano-zero-valent iron particles. , entering the environment will cause potential environmental hazards

Method used

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  • Iron-carrying meso-porous silicon composite material as well as preparation method and application thereof
  • Iron-carrying meso-porous silicon composite material as well as preparation method and application thereof
  • Iron-carrying meso-porous silicon composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of iron-loaded mesoporous silicon composite material:

[0036] (1) Preparation of mesoporous silicon SBA-15 carrier:

[0037] First, 4.0 g of block copolymer P123 was added to 160 mL of hydrochloric acid solution with a concentration of 1.54 mol / L, placed in a 35 °C water bath and stirred until dissolved, and then 8.6 g of tetraethyl orthosilicate (TEOs) was added dropwise to obtain a mixture . The aforementioned mixture was stirred at 35°C for 20 h, then transferred to a reaction kettle, and heated at 140°C for 24 h to obtain a white precipitate. Filter the white precipitate to collect the precipitate, air-dry the precipitate at room temperature, and obtain a white powder after drying; put the white powder obtained above into a box furnace, control the heating rate to 1°C / min, and heat up to 550°C in air for 4 h, to remove excess block copolymer P123, after the block copolymer P123 is removed, the mesoporous silicon SBA-15 carrier is obtained by ...

Embodiment 2

[0048] Take 80 ml of wastewater with a p-nitrophenol concentration of 400 mg / L, divide it into 8 groups on average, each group is 10 mL, and adjust the pH value of the solution to 2, 3, 4, 5, 6, 7, 8, and 9, respectively. To each group of wastewater, 50 mg of iron-loaded mesoporous silicon composite reduction material (experimental group) or mesoporous silicon material (control group) was added, and the temperature was 25 °C and the rotation speed was 150 rpm. After the reaction was completed, carry out solid-liquid separation with a 0.2 μm filter membrane, and measure the amount of unreduced p-nitrophenol in the filtrate using a UV-visible spectrophotometer. The experimental results are as follows: Figure 4 shown.

[0049] Depend on Figure 4 It can be seen that the reduction efficiency of the iron-loaded mesoporous silicon composite material of the present invention decreases slightly and then increases with the increase of the pH of the solution. When the pH of the soluti...

Embodiment 3

[0051] Prepare 30 groups of 10 mL p-nitrophenol-containing solutions, the initial concentrations of which are 200 mg / L, 400 mg / L, and 600 mg / L each in 10 parts, respectively add 50 mg of the iron-loaded mesoporous silicon composite prepared in Example 1 materials, at around 25°C and 150 rpm, for different concentrations of p-nitrophenol solutions (concentrations of p-nitrophenol solutions are 200 mg / L, 400 mg / L, 600 mg / L respectively) and the reaction time Samples were taken at 1 min, 2 min, 3 min, 5 min, 15 min, 30 min, 60 min, 90 min, 120 min, and 240 min, and the reaction solution was separated from the solid and liquid by a 0.2 μm filter membrane, and finally used The concentration of p-nitrophenol (PNP) solution after treatment was measured by ultraviolet-visible spectrophotometer.

[0052] The result is as Figure 5 shown by Figure 5 It can be seen that the iron-loaded mesoporous silicon composite material of the present invention has a good removal effect on p-nitrop...

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Abstract

The invention discloses an iron-carrying meso-porous silicon composite material as well as a preparation method and application thereof. The iron-carrying meso-porous silicon composite material is prepared by adopting the preparation method comprising the following steps: suspending meso-porous silicon in n-pentane, slowly introducing an iron source under magnetic stirring to obtain a ferric oxide meso-porous silicon composite material; after drying the ferric oxide meso-porous silicon composite material at a temperature of 50-70 DEG C, suspending in the n-pentane, under the atmosphere of an inert gas, dropwise adding a sodium borohydride solution, completely reducing ferric oxide to generate zero-valent iron so that the making of the iron-carrying meso-porous silicon is completed. The iron-carrying meso-porous silicon composite material is prepared by adopting a dual-solvent dipping method, can be applied to removal of organisms of nitrophenol organic matters in a water body, has the advantages of strong reducing property, high reaction rate, extremely short balance time, excellent oxidation resistance, and the like, and is high in removal rate and short in treatment time.

Description

technical field [0001] The invention relates to the field of material technology, in particular to an iron-loaded mesoporous silicon composite material and a preparation method and application thereof. Background technique [0002] Nitrophenol organic compounds are widely used in industry and agriculture, and are often used as intermediates for pesticides, polymer materials, explosives, pharmaceuticals, and synthetic dyes and other polymers. Such pollutants can enter the body through skin contact and ingestion, and can also be inhaled into the body. They are dangerous goods with cumulative effects. Therefore, the removal of nitrophenolic organic compounds in water has received extensive attention at home and abroad. [0003] At present, the methods for removing nitrophenolic organic compounds in wastewater mainly include: ion exchange, oxidation, adsorption, catalysis and so on. Among the removal methods of numerous nitrophenol organic pollutants, especially p-nitrophenol,...

Claims

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Application Information

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IPC IPC(8): C01G49/00C02F1/70C02F101/34C02F101/38
Inventor 汤琳汤晶杨贵德曾光明邓垚成章毅谢霞周耀渝方艳
Owner HUNAN UNIV
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