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Multi-passage-structure and high-adsorption-performance sepiolite/TiO2 composite material and preparation method thereof

A composite material and sepiolite technology, applied in the field of sepiolite/TiO2 composite material and its preparation, can solve the problems of uncontrollable particle size, poor dispersion, long time, etc. The method is simple, energy-saving, and widely used Prospects, the effect of low production costs

Inactive Publication Date: 2017-11-14
湘潭海泡石科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The precipitation method has the advantages of low temperature, simple operation and low cost, so it is used to prepare sepiolite / TiO 2 composite, however the following problems still exist: TiO 2 Easy to aggregate, uncontrollable particle size and poor dispersion; the channel structure of sepiolite is easy to block during the compounding process, which seriously affects the adsorption performance of the compound
The patent has the following characteristics: a two-step synthesis method is adopted; the complex is prepared by reacting in an environment of PH=4; the template agent polyethylene glycol 2000 is added in the synthesis process; the synthesis time is more than 4 days, which is relatively long; at 400-500 ° C Calcined at low temperature for 4 hours, high energy consumption; no description of the morphology and structural characteristics of the composite material; used for photocatalytic degradation of liquid phase dye Shihlin Scarlet, the degradation rate was 87%

Method used

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  • Multi-passage-structure and high-adsorption-performance sepiolite/TiO2 composite material and preparation method thereof
  • Multi-passage-structure and high-adsorption-performance sepiolite/TiO2 composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Sepiolite modification: Add 12 g of sepiolite powder to 300 g of water at room temperature, then add 20 g of concentrated hydrochloric acid, stir for 4 hours, filter, wash, and dry to obtain modified sepiolite;

[0029] (2) Disperse the sepiolite modified in step (1) in water, add sodium pyrophosphate as a dispersant, stir for 30 min, and add 125 mL of 0.6 mol / L TiCl dropwise 4aqueous solution, stirred for 5 min, and then added 40 mL of 1.0 mol / L (NH 4 ) 2 SO 4 The solution was heated to 80 ° C for 2 h, and ammonia water was added to adjust the pH value to 6, and naturally cooled to room temperature to obtain a brown precipitate;

[0030] (3) Wash the precipitate obtained in step (2) with distilled water, dry it at 80°C, and grind it into powder;

[0031] (4) Calcinate the powder obtained in step (3) at a temperature of 550 °C for 2 h to obtain the product sepiolite / TiO 2 Complex.

Embodiment 2

[0033] (1) Sepiolite modification: Add 12 g of sepiolite powder to 300 g of water at room temperature, then add 20 g of concentrated hydrochloric acid, stir for 4 hours, filter, wash, and dry to obtain modified sepiolite;

[0034] (2) Disperse the sepiolite modified in step (1) in water, add sodium pyrophosphate as a dispersant, stir for 30 min, and add 167mL of 0.6mol / L TiCl dropwise 4 aqueous solution, stirred for 5 min, and then added 40 mL of 1.0 mol / L (NH 4 ) 2 SO 4 The solution was heated to 80 ° C for 2 h, and ammonia water was added to adjust the pH value to 6, and naturally cooled to room temperature to obtain a brown precipitate;

[0035] (3) Wash the precipitate obtained in step (2) with distilled water, dry it at 80°C, and grind it into powder;

[0036] (4) Calcinate the powder obtained in step (3) at a temperature of 550°C for 2 h to obtain the product sepiolite / TiO 2 Complex.

Embodiment 3

[0038] (1) Sepiolite modification: Add 12 g of sepiolite powder to 300 g of water at room temperature, then add 20 g of concentrated hydrochloric acid, stir for 4 hours, filter, wash, and dry to obtain modified sepiolite;

[0039] (2) Disperse the sepiolite modified in step (1) in water, add sodium pyrophosphate as a dispersant, stir for 30 min, and add 250 mL of 0.6 mol / L TiCl dropwise 4 aqueous solution, stirred for 5 min, and then added 40 mL of 1.0 mol / L (NH 4 ) 2 SO 4 The solution was heated to 80 ° C for 2 h, and ammonia water was added to adjust the pH value to 6, and naturally cooled to room temperature to obtain a brown precipitate;

[0040] (3) Wash the precipitate obtained in step (2) with distilled water, dry it at 80°C, and grind it into powder;

[0041] (4) Calcinate the powder obtained in step (3) at a temperature of 550°C for 2 h to obtain the product sepiolite / TiO 2 Complex.

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Abstract

The invention discloses a preparation method of a multi-passage-structure and high-adsorption-performance sepiolite / TiO2 composite material. The preparation method comprises the following steps of firstly, carrying out acid modification on sepiolite to obtain modified sepiolite; afterwards, carrying out debundling dispersion on the sepiolite through adding a dispersant; finally, synthesizing the sepiolite / TiO2 composite material under the assistance of ammonia sulfate by adopting an ammonia water precipitation method and using TiCl4 as a titanium source. The morphology of the composite material prepared by the method is that TiO2 nano particles are highly uniformly dispersed on the surface of the fiber-plate-shaped sepiolite; TiO2 particles are combined with the sepiolite to form a loose whole; the composite material shows a multi-passage stricture. According to the preparation method, the sepiolite / TiO2 composite material is prepared under the action of the dispersant of sodium polymetaphosphate, sodium ortho-metaphosphate or sodium pyrophosphate and the like and by using the modified sepiolite as a raw material and the TiCl4 as the titanium source and adopting the ammonia water precipitation method; the TiO2 nano particles are uniformly loaded on a fiber plate of the sepiolite; moreover, the obvious aggregation does not exist; the compound is of the multi-passage structure, high in adsorption performance and is time-saving and environment-friendly in synthesis condition.

Description

technical field [0001] The invention belongs to the field of composite material preparation, in particular to a sepiolite / TiO with multi-channel structure and strong adsorption performance 2 Composite materials and methods for their preparation. Background technique [0002] Sepiolite is a fibrous hydrated Mg-Al silicate mineral, with a layered structure consisting of two layers of silicon-oxygen tetrahedron sandwiching a layer of magnesium-oxygen octahedron. This special structure makes sepiolite have good With the advantages of ion exchange, chemical stability and adsorption, it has shown great advantages in the field of environmental governance as a mineral carrier-supported semiconductor photocatalyst. Eren et al reported sepiolite / Fe in Desalination 262 (2010) 43 2 o 3 Composite materials for Cu in wastewater 2+ Ions have good adsorption performance, which is 1.44 times higher than that of sepiolite raw materials. Zhang et al studied sepiolite / TiO in Chemical Engin...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J21/16B01D53/86B01J20/30B01D53/72
CPCB01D53/02B01D53/8668B01J20/06B01J20/12B01J21/16B01D2255/802B01D2257/708B01J2220/42B01J35/39
Inventor 谭建杰刘蕊蕊廖祥冀志江陈秋霖王静曾召刚张琎珺刘卫湘谢彦
Owner 湘潭海泡石科技有限公司
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