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Preparation method for amino nano-TiO2/SiO2 compound fiber membrane, product and application thereof

A nano-titanium dioxide and composite fiber membrane technology, applied in the field of water pollution treatment, can solve the problems of difficult recovery, secondary pollution, low adsorption rate, etc., and achieve the effects of no secondary pollution, reduction of agglomeration, and increase of adsorption quantity.

Inactive Publication Date: 2018-01-26
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a method for preparing an aminated nano-titanium dioxide / silicon dioxide composite fiber membrane for the problems of low adsorption rate, difficult recovery, and easy generation of secondary pollution of many existing adsorbent materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Under magnetic stirring, dissolve tetrabutyl titanate and tetraethyl orthosilicate in a mixed solvent of 40mL ethanol and 20mL acetic acid according to the molar ratio of 1:1. After mixing evenly, adjust the pH to 8, and add 0.1 mg of silane coupling agent is reacted at 150°C for 6~12 hours to obtain a uniform precursor solution. Using electrospinning technology, take an appropriate amount of aminated TiO 2 / SiO 2 Put the precursor solution in the syringe, control the spinning rate to 1.5mL / h, and the spinning voltage to 10kV. After a period of time, dense aminated nano-TiO can be obtained on the collecting plate. 2 / SiO 2 Composite material precursor fiber film, and then vacuum-dried to obtain aminated nano-TiO 2 / SiO 2 Composite fiber membrane. The prepared aminated nano-TiO 2 / SiO 2 The removal rate of Ni(Ⅱ) by composite fiber membrane is 95.5%.

Embodiment 2

[0026] Under magnetic stirring, dissolve tetrabutyl titanate and ethyl orthosilicate in a mixed solvent of 40mL ethanol and 10mL acetic acid according to the molar ratio of 1:2. After mixing evenly, adjust the pH to 10, and add 0.8mg of silane coupling agent is reacted at 150°C for 6~12h to obtain a uniform precursor solution. Using electrospinning technology, take an appropriate amount of aminated TiO 2 / SiO 2 Put the precursor solution in the syringe, control the spinning rate to 1.5mL / h, and the spinning voltage to 10kV. After a period of time, dense aminated nano-TiO can be obtained on the collecting plate. 2 / SiO 2 Composite material precursor fiber film, and then vacuum-dried to obtain aminated nano-TiO 2 / SiO 2 Composite fiber membrane. The prepared aminated nano-TiO 2 / SiO 2 The removal rate of Ni(Ⅱ) by the composite fiber membrane was 86.3%.

Embodiment 3

[0028] Under magnetic stirring, dissolve tetrabutyl titanate and ethyl orthosilicate in a mixed solvent of 40mL ethanol and 10mL acetic acid according to the molar ratio of 1:1. After mixing evenly, adjust the pH to 9, and add 0.6mg of silane coupling agent is reacted at 150°C for 6~12h to obtain a uniform precursor solution. Using electrospinning technology, take an appropriate amount of aminated TiO 2 / SiO 2 Put the precursor solution in the syringe, control the spinning rate to 1.5mL / h, and the spinning voltage to 10kV. After a period of time, dense aminated nano-TiO can be obtained on the collecting plate. 2 / SiO 2 Composite material precursor fiber film, and then vacuum-dried to obtain aminated nano-TiO 2 / SiO 2 Composite fiber membrane. The prepared aminated nano-TiO 2 / SiO 2 The removal rate of Ni(Ⅱ) by the composite fiber membrane was 91.2%.

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Abstract

The invention relates to a preparation method for an amino nano-TiO2 / SiO2 compound fiber membrane, a product and an application thereof. In the method, a static spinning technique is utilized. The method comprises the following steps: putting an amino TiO2 / SiO2 precursor solution into an injector and controlling the spinning rate and voltage; acquiring a compact amino nano-TiO2 / SiO2 compound precursor fiber membrane on a collecting plate after a period of time; and performing vacuum drying, thereby acquiring the amino nano-TiO2 / SiO2 compound fiber membrane. According to the preparation method,the removal rate of the heavy metal ions in water can be effectively increased. According to the invention, the small size effect, high specific surface area, high porosity and functional group introduction of the nanometer fiber are fully utilized, so that the binding sites with the corresponding heavy metal ions are increased, the adsorption capacity of the adsorbent to the heavy metal ions iseffectively increased, the absorbing balance time is shortened, the absorbing materials are easily separated and recycled and the problem of adsorbent recycling is effectively solved. The process is simple, the cost is low and the selectivity is high.

Description

technical field [0001] The invention relates to a method for preparing an aminated nano-titanium dioxide / silicon dioxide composite fiber membrane and its product and application, which can effectively improve the adsorption capacity of heavy metal ions in waste water, meet national discharge standards, and be used in the field of water pollution treatment. Background technique [0002] Heavy metals will cause serious harm to human health, animals, plants, and aquatic organisms. Therefore, wastewater treatment related to heavy metal ions has always attracted the attention of workers in the field of environmental engineering at home and abroad. At present, the methods for treating heavy metal wastewater mainly include adsorption method, chemical precipitation method, ion exchange method, membrane separation method, etc., and each method has its own advantages in the treatment of heavy metal wastewater. As a traditional heavy metal wastewater treatment method, the adsorption me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/22B01J20/30C02F1/28C02F101/20
Inventor 何丹农童琴赵昆峰代卫国邓洁金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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