Method for preparing magnetic-biochar-supported photocatalyst

A photocatalyst, biochar technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of difficult catalyst recovery, unfavorable catalyst regeneration and reuse, etc., to increase the photocatalytic efficiency. , the effect of reducing churn and reducing churn loss

Inactive Publication Date: 2016-05-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But nano TiO 2 Due to its fine particles, the powder suspension system is difficult to recover the catalyst, which is not conducive to the regeneration and reuse of the catalyst

Method used

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  • Method for preparing magnetic-biochar-supported photocatalyst
  • Method for preparing magnetic-biochar-supported photocatalyst
  • Method for preparing magnetic-biochar-supported photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (A) Preparation of magnetic biochar:

[0037] Wash 10.00g of rice roots, dry them, shred them, and place them in a crucible; carry out pre-carbonization treatment in a muffle furnace, in an air atmosphere, at a heating rate of 5°C / min, and heat up to 250°C for 4 hours at a constant temperature. Take it out after cooling to get 4.60g of the pre-carbonized sample; put the pre-carbonized sample into a porcelain boat, raise the temperature in a tube furnace with nitrogen protection (at a rate of 5°C / min), and heat it up to 700°C for 4 hours at a constant temperature , take out after natural cooling, and grind to obtain 2.30 g of magnetic biochar powder.

[0038] The hysteresis curve of the magnetic biochar powder calcined at 700℃ is as follows: figure 1 shown, from figure 1 It can be seen that the magnetic biochar powder is a kind of soft magnetic material.

[0039] (B) Preparation of photocatalyst precursor

[0040] Take 17mL of butyl titanate, add 11mL of absolute eth...

Embodiment 2

[0046] The photocatalyst containing 5% magnetic biochar with the best degradation effect was used for repeated performance tests to degrade the simulated pollutant Active Brilliant Red X-3B.

[0047] Take 5ml of the reactive brilliant red dye stock solution prepared in advance in a 250mL volumetric flask, add deionized water to dilute to a constant volume, and obtain a dye solution with a concentration of 20mg / L. Transfer the solution to a 500ml beaker, add 0.25g catalyst, put it into a constant temperature water tank, stir it mechanically for 30min until the adsorption equilibrium, turn on the light source, and start photocatalytic degradation. Samples were taken at 10min, 20min, 30min, 45min, 60min, and 90min after the start of illumination, and the supernatant was taken after centrifugation (10000rpm, 10min), and the ultraviolet absorption spectrum was measured at 536nm, and compared with the standard curve, the concentration of the dye solution after illumination was calcul...

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Abstract

The present invention discloses a method for preparing a magnetic-biochar-supported photocatalyst, and the method is as follows: first using a rice root pyrolysis method for preparing magnetic biochar, then using a sol-gel method for preparing a photocatalyst precursor, and using a hydrothermal method for preparing the magnetic-biochar-supported photocatalyst. The magnetic-biochar-supported photocatalyst is a upported photocatalyst using the magnetic biochar as a carrier for supporting a TiO2 active ingredient, mass percent of the magnetic biochar is 1 to 10%, and the magnetic-biochar-supported photocatalyst can be used as a photocatalyst oxidation catalyst. The magnetic carrier can be obtained by direct one-step carbonization and reduction from biological material rice root, the magnetic carrier is easy to recycle, the loss of the photocatalyst can be effectively reduced, and visible light wave band absorption capacity can be enhanced.

Description

(1) Technical field [0001] The invention relates to a photocatalyst, in particular to a method for preparing a magnetic biochar-supported photocatalyst. (2) Background technology [0002] Photocatalytic oxidation is an advanced oxidation technology that has developed rapidly in the past 20 years. But nano TiO 2 Due to the fine particles of the powder suspension system, it is difficult to recover the catalyst, which is not conducive to the regeneration and reuse of the catalyst. To realize the application of this technology in large-scale water treatment, it is necessary to solve the loading problem of photocatalyst and improve the activity of photocatalyst. Porous materials usually have significant characteristics and properties such as high specific surface area, high pore volume, adjustable pore structure size, low dielectric constant and low thermal conductivity, so porous adsorption carriers and TiO 2 Photocatalyst compounding to improve photocatalytic efficiency has ...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J21/06
CPCB01J21/063B01J21/18B01J35/33
Inventor 许炉生李许豪黄辉夏阳陶新永甘永平张文魁
Owner ZHEJIANG UNIV OF TECH
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