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Preparation method of nano Cu2O/Ag/TiO2-zeolite hybridization mesoporous molecular sieve composite material

A technology of mesoporous molecular sieves and composite materials, applied in the field of composite materials, can solve the problems of fast recombination speed of photogenerated electrons and holes, difficult engineering application, large forbidden band width, etc., and achieves good removal effect, strong adsorption capacity, and improved The effect of efficiency

Inactive Publication Date: 2017-05-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its bandgap width is relatively large (3.2eV), and it can only be excited by ultraviolet light to produce photocatalytic activity. At the same time, the photogenerated electrons and holes recombine quickly and have a high recombination rate. These shortcomings make it difficult for engineering applications.

Method used

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  • Preparation method of nano Cu2O/Ag/TiO2-zeolite hybridization mesoporous molecular sieve composite material

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Experimental program
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Effect test

Embodiment 1

[0027] Natural zeolite is mixed with sodium hydroxide solution, wherein, the concentration of sodium hydroxide solution is 5mol / L, and the volume-to-weight ratio (mL solution / g zeolite) of sodium hydroxide solution and zeolite is 5:1, after fully mixing, in 120 The zeolite precursor was prepared by reacting at ℃ for 2 hours; in the hydrogel where the zeolite precursor and the alkali solution of mesoporous molecular sieve MCM-41 were mixed, 2 +Al 2 o 3 ):NaOH:C 16 TMABr:H 2 The molar ratio of O is 1:1:2:100, wherein, among them, SiO 2 :Al 2 o 3 The molar ratio is 30:1. Nano-silver and titanium dioxide are mixed evenly with hydrogel, the mass ratio of nano-silver and hydrogel is 1:2, the mass ratio of described titanium dioxide and hydrogel is 1:4, nano-Cu 2 The mass ratio of O to hydrogel is 1:5. Crystallization was carried out at 105°C and autogenous pressure for 24 hours, followed by separation, washing and drying. Finally, calcination was carried out at 550° C. for ...

Embodiment 2

[0029] The preparation method of nano-silver / titanium dioxide-zeolite hybrid mesoporous molecular sieve composite material in this embodiment specifically includes the following steps:

[0030] (1) adding the zeolite precursor to the alkali solution of the mesoporous molecular sieve, and fully mixing to obtain a hydrogel;

[0031] (2) adding nano-silver and titanium dioxide to the hydrogel and mixing evenly to obtain a mixed gel;

[0032] (3) Carry out crystallization treatment on the mixed gel, and after the end, separate, wash and dry the product;

[0033] (4) calcining the product under high temperature conditions to obtain the Cu 2 O / Ag / TiO 2 - Zeolite hybrid mesoporous molecular sieve composite material.

[0034] In step (1), the silicon source and the aluminum source are added to the alkali solution, mixed thoroughly, and reacted at 130° C. for 3 hours to obtain a zeolite precursor. The silicon source is silica sol, the aluminum source is sodium metaaluminate, and th...

Embodiment 3

[0039] The preparation method of nano-silver / titanium dioxide-zeolite hybrid mesoporous molecular sieve composite material in this embodiment specifically includes the following steps:

[0040] (1) adding the zeolite precursor to the alkali solution of the mesoporous molecular sieve, and fully mixing to obtain a hydrogel;

[0041] (2) adding nano-silver and titanium dioxide to the hydrogel and mixing evenly to obtain a mixed gel;

[0042] (3) Carry out crystallization treatment on the mixed gel, and after the end, separate, wash and dry the product;

[0043] (4) Calcining the product under high temperature conditions to obtain the nano-silver / titanium dioxide-zeolite hybrid mesoporous molecular sieve composite material.

[0044] In step (1), the silicon source and the aluminum source are added to the alkali solution, mixed thoroughly, and reacted at 100° C. for 10 hours to obtain a zeolite precursor. Among them, the molar ratio of silicon source, aluminum source and alkali sol...

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Abstract

The invention relates to a preparation method of nano Cu2O / Ag / TiO2-zeolite hybridization mesoporous molecular sieve composite material. The method specifically comprises the following steps: (1) adding a zeolite precursor into an alkaline solution of a mesoporous molecular sieve, sufficiently mixing, reacting for 1 to 5 hours at 90 to 150 DEG C, and obtaining hydogel; (2) adding nano Ag, nano Cu2O and TiO2 into the hydrogel, and uniformly mixing to obtain mixed gel; (3) crystallizing the mixed gel, after the crystallization, separating, washing, drying, and obtaining a midbody; and (4) calcining the midbody at a high temperature to obtain the nano Cu2O / Ag / TiO2-zeolite hybridization mesoporous molecular sieve composite material. Compared with the prior art, the zeolite precursor is synthesized by a silicon source and an aluminum source, the zeolite precursor is introduced into porous walls of the mesporous molecular sieve; and moreover, by adding the nano Ag, nano Cu2O and TiO2, the efficiency of the composite material for separating and degrading organic pollutants can be increased, the preparation process is simple, the flexibility is high, and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a nano Cu 2 O / Ag / TiO 2 -Preparation method of zeolite hybrid mesoporous molecular sieve composite material. Background technique [0002] With the rapid development of agriculture and industry, a large amount of waste water has caused great harm to the natural environment and human body. Agricultural and industrial wastewater is rich in organic pollutants such as antibiotics, humic acids, etc. High concentrations of organic pollutants lead to environmental damage. Animal husbandry, urban and agricultural wastewater, industrial wastewater will increase the concentration of organic matter in the water environment. Wastewater rich in high concentrations of organic matter has many sources and a large amount of discharge. Untreated or incompletely treated wastewater will cause great harm to the environment. Therefore, the treatment of high-concentration organic pollutan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/00B01J20/18B01J20/30C02F1/28C02F1/30C02F101/30
CPCB01J20/0233B01J20/06B01J20/165B01J20/186C02F1/281C02F1/30B01J29/00C02F2101/30C02F2305/10B01J35/39Y02W10/37
Inventor 刘敏敏于水利
Owner TONGJI UNIV