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Silica/nano-titanium dioxide/silicalite composite material for treating cyanide-containing wastewater and its application

A nano-titanium dioxide and silicon dioxide technology, used in physical/chemical process catalysts, metallurgical wastewater treatment, water/sewage treatment, etc., can solve problems such as weak adsorption capacity, achieve increased surface area, large specific surface area, and ensure modification. effect of effect

Active Publication Date: 2019-10-25
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, when treating cyanide-containing wastewater, the composite materials generally use diatomite composite materials or bentonite composite materials, and these composite materials have relatively weak adsorption capacity for copper, zinc and cyanide.

Method used

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  • Silica/nano-titanium dioxide/silicalite composite material for treating cyanide-containing wastewater and its application
  • Silica/nano-titanium dioxide/silicalite composite material for treating cyanide-containing wastewater and its application
  • Silica/nano-titanium dioxide/silicalite composite material for treating cyanide-containing wastewater and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Preparation of silicalite carrier

[0042] Mix silicalite and sodium hydroxide solution with a mass ratio of 1:4, put them in a three-necked flask, place in an electric heating mantle, and stir at 60°C for 36 hours. Add diethylenetriamine as a pore structure regulator during the stirring process , The dosage of diethylenetriamine is 1g / L to synthesize modified silicalite gel.

[0043] Put the modified silica zeolite gel in an autoclave with a pressure of 2atm, control the temperature at 100℃, react for 24 hours, filter, first wash with deionized water 3 times, then dry at 80℃ for 12 hours, and finally roast at 550℃4 A modified silicalite support was obtained within hours.

[0044] (2) Preparation of silica / nano-titanium dioxide / silica zeolite composite material

[0045] Dissolve butyl titanate, absolute ethanol, concentrated nitric acid, and lanthanum nitrate in water, stir at 300r / s for 30 minutes to obtain a milky white liquid, and evaporate to dryness at 80°C to obtain ...

Embodiment 2

[0051] (1) Preparation of silicalite carrier

[0052] Mix silicalite and sodium hydroxide solution with a mass ratio of 1:2, place them in a three-necked flask, place in an electric heating mantle, and stir at 90°C for 32 hours. Add AlCl during the stirring process 3 As a pore structure regulator, AlCl 3 The dosage is 3g / L to synthesize modified silicalite gel.

[0053] Put the modified silica zeolite gel in an autoclave with a pressure of 3atm, control the temperature at 60℃, react for 35 hours, filter, first wash with deionized water 3 times, then dry at 50℃ for 22 hours, and finally calcinate at 450℃8 A modified silicalite support was obtained within hours.

[0054] (2) Preparation of silica / nano-titanium dioxide / silica zeolite composite material

[0055] Dissolve butyl titanate, absolute ethanol, concentrated nitric acid, and lanthanum nitrate in water, stir at 400r / s for 25 minutes to obtain a milky white liquid, and evaporate to dryness at 50°C to obtain nano titanium dioxide pa...

Embodiment 3

[0060] (1) Preparation of silicalite carrier

[0061] Mix silicalite and sodium hydroxide solution with a mass ratio of 1:5, put them in a three-necked flask, place in an electric heating mantle, and stir at 120°C for 30 hours. Add FeCl during the stirring process 3 As a pore structure regulator, FeCl 3 The dosage is 5g / L to synthesize modified silicalite gel.

[0062] Put the modified silica zeolite gel in an autoclave with a pressure of 3.5 atm, control the temperature at 80°C, react for 30 hours, filter, wash with deionized water 4 times, dry at 60°C for 20 hours, and finally roast at 600°C The modified silicalite support was obtained in 6.5 hours.

[0063] (2) Preparation of silica / nano-titanium dioxide / silica zeolite composite material

[0064] Dissolve butyl titanate, absolute ethanol, concentrated nitric acid, and lanthanum nitrate in water, stir at 350r / s for 20 minutes to obtain a milky white liquid, and evaporate to dryness at 60°C to obtain nanometer titanium dioxide partic...

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Abstract

The invention belongs to the technical field of waste water treatment, and in particular relates to a silicon dioxide / nano titanium dioxide / silicalite composite material for treating cyanide-containing waste water and an application thereof. The preparation method of the silicon dioxide / nano-titania / silicalite composite material comprises the following steps: firstly mixing the silicalite with the sodium hydroxide solution, adding a pore structure regulator, synthesizing the silicalite gel, reacting, filtering, washing, drying and calcining to obtain a silicalite carrier; then mixing the silicalite carrier and nano-titanium dioxide particles uniformly, pressing into thin sheets, roasting, soaking in silica gel, and drying to obtain a silica / nano-titanium dioxide / silicalite composite material. In the present invention, free cyanide and complex cyanide are decomposed under the catalysis of nano-titanium dioxide and become non-toxic substances, while zinc and copper heavy metals are adsorbed to the surface of the material, which realizes the effective degradation of cyanide in cyanide-containing wastewater and the treatment of heavy metals. effective adsorption of ions.

Description

Technical field [0001] The invention belongs to the technical field of wastewater treatment, and specifically relates to a silica / nano-titanium dioxide / silicate composite material for treating cyanide-containing wastewater and its application. Background technique [0002] Cyanide-containing wastewater is the most toxic wastewater in electroplating production. Because cyanide ions have good complexing, surface activity, and activation properties, cyanide is used in large quantities in the cyanide leaching process of the electroplating industry and the gold industry, and cyanide and thiocyanide are extremely toxic substances, so cyanide-containing wastewater Governance is particularly important. [0003] Cyanide-containing wastewater usually contains free cyanide ions and cyanide ions complexed with copper and zinc. At present, there are many methods for treating cyanide-containing wastewater. The acidification method is a technology commonly used in factories, which can maximize ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J29/04B01J35/10C02F1/28C02F1/30C02F103/16C02F101/18C02F101/20
CPCB01J20/10B01J20/18C02F1/281C02F1/30B01J29/04B01J2229/14C02F2103/16C02F2101/18C02F2101/20B01J35/643B01J35/615
Inventor 张亚莉宫本奎楚玮李德刚张仰顺李瀚程虎
Owner SHANDONG UNIV OF TECH
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