A bi2wo6 nanocomposite fiber visible light catalyst

A nano-composite fiber and nano-fiber technology, applied in the field of nano-materials and catalytic materials, can solve the problems of low photocatalytic activity, cumbersome and complicated preparation methods, poor controllability and repeatability, etc., and achieve high-efficiency catalytic degradation performance and dispersion effect. Excellent, easy-to-use results

Inactive Publication Date: 2016-01-27
ANHUI POLYTECHNIC UNIV
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Problems solved by technology

[0005] Chinese patent 200810197020.7 discloses a visible light catalyst Bi 2 WO 6 The preparation method of nano powder, the powder has better crystallinity, smaller particle size and larger specific surface area, so it has better visible light catalytic performance when the dye is degraded, but there are still some problems in the application process. Disadvantages of easy reunion
[0006] Chinese patent 201110441585.7 discloses a microwave hydrothermal method for preparing porous and loose wool ball-like bismuth tungstate powder photocatalysts. The prepared powder has a special shape-layered porous loose wool balls composed of thin flakes, Low energy consumption, friendly to the environment, but the photocatalytic activity is still not very high, and it is not easy to recycle after use
[0007] The above preparation methods are cumbersome and complicated, with high cost and poor controllability and repeatability

Method used

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  • A bi2wo6 nanocomposite fiber visible light catalyst

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preparation example Construction

[0025] A Bi 2 WO 6 Nanocomposite fiber visible light catalyst, the Bi 2 WO 6 The nanocomposite fiber visible light catalyst includes an adsorption region (carbon nanofiber) and a visible light catalytic active region (nano-Bi 2 WO 6 ), its preparation method comprises the steps:

[0026] (1) Design a polymer p(AN-g-PEO) that coordinates with bismuth ions. According to the structure of bismuth ions, N and O can form complexes with metal bismuth ions by coordination bonds. The equivalent group polymer is used as a fiber-forming polymer, and the main chain of the designed graft is polyacrylonitrile, which is used as the precursor of carbon nanofibers; the regular branch chain of the graft is designed to be polyoxyethylene, which is used as the 2 WO 6 template molecule;

[0027] (2) Preparation of modified carbon nanofiber visible light catalyst, including the following steps: preparation of electrospinning liquid containing bismuth nitrate and sodium tungstate; optimizatio...

Embodiment 1

[0030] A Bi 2 WO 6 Nanocomposite fiber visible light catalyst, it comprises the steps:

[0031] 1) Take 2.06 mmol of bismuth nitrate and add it to 20 ml of N-N dimethylformamide, and disperse by ultrasonic oscillation for 1 h.

[0032] 2) Add 1.03 mmol of sodium tungstate to the above solution, and disperse by ultrasonic oscillation for 1 hour.

[0033]3) Add 2gp(AN-g-PEO) to the above solution to make a 10% p(AN-g-PEO) solution, stir for 12 hours and mix well to make a spinning solution.

[0034] 4) Transfer the prepared spinning solution into a 10ml syringe, set it up, and carry out electrospinning. The spinning conditions are that the receiving distance is 200 mm based on the distance between the tip of the capillary and the receiving plate, a voltage of 19 kV is applied, the flow rate of silk liquid is 0.2 ml / hour, and the receiving time is 12 hours. What is collected on the receiving screen is the visible light catalyst bismuth tungstate nanofiber film.

[0035] 5) C...

Embodiment 2

[0038] A Bi 2 WO 6 Nanocomposite fiber visible light catalyst, it comprises the steps:

[0039] 1) Take 2.06 mmol of bismuth nitrate and add it to 20 ml of N-N dimethylformamide, and disperse by ultrasonic oscillation for 1 h.

[0040] 2) Add 1.03 mmol of sodium tungstate to the above solution, and disperse by ultrasonic oscillation for 1 hour.

[0041] 3) Add 2gp(AN-g-PEO) to the above solution to make a 10% p(AN-g-PEO) solution, stir for 12 hours and mix well to make a spinning solution.

[0042] 4) Transfer the prepared spinning solution into a 10ml syringe, set it up, and carry out electrospinning. The spinning conditions are that the receiving distance is 180 mm based on the distance between the tip of the capillary and the receiving plate, a voltage of 20 kV is applied, the flow rate of silk liquid is 0.2 ml / hour, and the receiving time is 10 hours. What is collected on the receiving screen is the visible light catalyst bismuth tungstate nanofiber film.

[0043] 5) ...

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Abstract

The invention discloses a Bi2WO6 nano-composite fiber visible photocatalyst and preparation method thereof, and the Bi2WO6 nano-composite fiber visible photocatalyst comprises an adsorption zone (carbon nanofiber) and a visible photocatalytic activity zone (nano Bi2WO6). The invention has the characteristics of low energy band, high quantum efficiency, large specific surface area, high stability, easy recovery, environment protection, etc., and can catalyze and degrade methylene blue with high efficiency. The degradation rate with xenon lamp irradiation for 2.5 h reaches to 95.17%; the preparation method comprises the following steps: designing and synthesizing polymer p (AN-g-PEO) which is coordinated with bismuth ions, and preparing the modified carbon nanofiber visible light catalyst. In the preparation process, the reaction condition of ultrasonic vibration for dispersion is mild, and the invention has the advantages of easy operation, excellent dispersion effect and stable dispersion.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and catalytic materials, specifically a Bi 2 WO 6 Nanocomposite fiber visible light catalyst. Background technique [0002] At present, the dye wastewater treatment methods mainly include adsorption method, biodegradation method, electrolysis method and coagulation precipitation method, etc., but most of them cannot meet the needs of modern society. Adsorption purification has small adsorption capacity, large equipment volume, limited adsorbent capacity, frequent regeneration, low equipment utilization, and cannot completely eliminate pollutants; biodegradation takes a long time but is often difficult to completely eliminate pollutants; electrolysis The current efficiency is still low, the energy consumption is high, the efficiency of the electrocatalytic degradation reactor is low, and the processing cost is high, so it is not suitable for large-scale applications. The use of visible lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31B01J37/34C02F1/30
Inventor 刘新华李红章吴筱徐珍珍
Owner ANHUI POLYTECHNIC UNIV
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