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Nanometer magnesium silicate adsorbing material and preparation method therefor

An adsorption material, magnesium silicate technology, applied in chemical instruments and methods, adsorption water/sewage treatment, silicon compounds, etc. Overcome the effects of large-scale production, good adsorption capacity, and broad practical application

Active Publication Date: 2015-10-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the magnesium silicate materials used in the above-mentioned literature is in the order of millimeters or microns, resulting in a small external specific surface area, which is not easy to fully contact with the adsorbate, and limits the adsorption performance of the material.

Method used

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  • Nanometer magnesium silicate adsorbing material and preparation method therefor
  • Nanometer magnesium silicate adsorbing material and preparation method therefor
  • Nanometer magnesium silicate adsorbing material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step A: take by weighing 10.256g (40mmol) Mg (NO 3 ) 2 ·6H 2 O and 11.369g (40mmol) Na 2 SiO 3 9H 2 Dissolve O in 200mL deionized water, stir well to dissolve.

[0027] Step B: Pour the two solutions of step A into the liquid film reactor at a flow rate of 1000mL / min in equal volume, adjust the rotor speed to 4000rpm, and the rotor-stator distance to 0.1mm, and mix quickly for 2min.

[0028] Step C: Transfer the above slurry to a hydrothermal reaction kettle with stirring, the heating rate is 1°C / min, the temperature is slowly raised to 170°C, the temperature is kept constant for 12 hours, and the stirring rate is 100r / min.

[0029] Step D: After the reaction, the slurry was naturally cooled to room temperature, centrifuged, washed with 100 mL of deionized water for 3 times, and dried in an oven at 60°C for 24 hours to obtain the nano-magnesium silicate adsorption material.

[0030] figure 1 It is the XRD analysis result of the prepared nano-magnesium silicate, w...

Embodiment 2

[0032] Step A: Weigh 8.132g (40mmol) MgCl 2 ·6H 2 O and 11.369g (40mmol) Na 2 SiO 3 9H 2Dissolve O in 200mL deionized water, stir well to dissolve.

[0033] Step B: Pour the two solutions of step A into the liquid film reactor at a flow rate of 1000mL / min in equal volume, adjust the rotor speed to 4000r / min, the rotor-stator distance to 0.1mm, and quickly nucleate for 2min.

[0034] Step C: Transfer the above slurry to a hydrothermal reaction kettle with stirring. The heating rate is about 1°C / min, and the temperature is slowly raised to 170°C. The temperature is kept constant for 12h at a stirring rate of 100r / min.

[0035] Step D: After the reaction, the slurry was naturally cooled to room temperature, centrifuged, washed 5 times with 100 mL of deionized water, and no visible precipitation of chloride ions was detected with silver nitrate solution, and then dried in an oven at 60°C for 24 hours to obtain nano Magnesium silicate adsorption material.

[0036] XRD analysi...

Embodiment 3

[0038] Step A: Weigh 4.815g MgSO 4 (40mmol) and 11.369g Na 2 SiO 3 9H 2 O (40mmol) was dissolved in 200mL deionized water respectively, and stirred thoroughly to dissolve it.

[0039] Step B: Pour the two solutions of step A into the liquid film reactor at a flow rate of 1000mL / min in equal volume, adjust the rotor speed to 4000r / min, the rotor-stator distance to 0.1mm, and quickly nucleate for 2min.

[0040] Step C: Transfer the above slurry to a hydrothermal reaction kettle with stirring, the heating rate is 1°C / min, the temperature is slowly raised to 170°C, the temperature is kept constant for 12 hours, and the stirring rate is 100r / min.

[0041] Step D: naturally cool the reacted slurry to room temperature, centrifuge, wash 5 times with 100 mL of deionized water, use barium nitrate solution to detect no visible precipitation of sulfate ions, and then dry it in an oven at 60°C for 24 hours to obtain Nano magnesium silicate adsorption material.

[0042] XRD analysis sh...

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Abstract

The invention provides a method for preparing an efficient nanometer magnesium silicate adsorbing material by using common raw materials through simple steps. A magnesium silicate colloid is synthesized by a liquid film reactor and a nucleation-crystallizing isolating method, and nanometer magnesium silicate particles are obtained through low temperature drying. The rotating liquid film reactor is used, and reaction conditions are regulated, so that the agglomeration of products is effectively improved, and the particle diameter of the products is decreased. Tests prove that the prepared magnesium silicate adsorbing material is the particles of 100nm-2 <mu>m, the specific surface area is 140-200m2 / g, and the magnesium silicate adsorbing material has excellent characteristics of rich hole structures, large specific surface area, high surface charge and the like. The capacity of the magnesium silicate adsorbing material for removing organic dye namely methylene blue is excellent, after about 10 minutes, an adsorption reaction is close to balance, and under the premise that the removing rate is ensured to be more than 90%, the largest adsorption quantity achieves 280-365mg / g. The preparation method provided by the invention has high maneuverability, the used raw materials are cheap, the industrial production is facilitated, and the preparation method has wide application prospects in the field of wastewater treatment.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of inorganic functional materials, and in particular relates to a nanometer magnesium silicate adsorption material and a preparation method thereof. Background technique: [0002] Water pollution is one of the bottleneck problems encountered in the development of today's society. Harmful organic dyes and toxic heavy metal ions discharged from industry are currently important sources of water pollution, directly threatening human production, life and health. The development of efficient and feasible sewage treatment technology is a major problem to be solved urgently in today's society. [0003] At present, sewage treatment technologies mainly include physical methods, biological methods and chemical methods. Among them, physical adsorption is the most commonly used and most economical method. Central to this approach is the development of efficient and inexpensive adsorption materials. Amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28
Inventor 冯拥军黄人瑶李殿卿唐平贵冯俊婷
Owner BEIJING UNIV OF CHEM TECH
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