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A method for efficiently treating cr-containing 6+ (b,o) co-doping g-c of wastewater 3 no 4 Preparation method of photocatalyst

A photocatalyst, g-c3n4 technology, used in physical/chemical process catalysts, chemical instruments and methods, special compound water treatment, etc. The effect of simple process and low production cost

Active Publication Date: 2022-04-08
广东沁华智能环境技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For g-C in the prior art 3 N 4 The high recombination rate of photogenerated carriers leads to low photocatalytic activity, and most of the existing literature and patents are based on g-C 3 N 4 Composite with other semiconductor materials to improve g-C 3 N 4 Photocatalytic activity, complex process, high production cost, strict control of g-C 3 N 4 The ratio between other semiconductor materials and other issues

Method used

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  • A method for efficiently treating cr-containing <sup>6+</sup> (b,o) co-doping g-c of wastewater <sub>3</sub> no <sub>4</sub> Preparation method of photocatalyst
  • A method for efficiently treating cr-containing <sup>6+</sup> (b,o) co-doping g-c of wastewater <sub>3</sub> no <sub>4</sub> Preparation method of photocatalyst
  • A method for efficiently treating cr-containing <sup>6+</sup> (b,o) co-doping g-c of wastewater <sub>3</sub> no <sub>4</sub> Preparation method of photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, weigh 10g of urea with an electronic analytical balance, and then weigh 0.1g of NaBH 4 (i.e. urea and NaBH 4 The mass ratio is 100:1), put it into a mortar, grind for 20 minutes to mix all components well, then put it into a 100ml crucible, cover it and heat it in a muffle furnace at a rate of 5°C / min rate, calcined at a high temperature of 550°C for 2h, and took out the sample after naturally cooling to room temperature with the furnace. The samples were centrifuged and washed three times with deionized water, put into a drying oven at 60°C for 24 hours, and finally the catalyst was collected.

[0044] XRD spectrum ( figure 1 (b)) shows that for the addition of 0.1g of NaBH 4 Modified g-C 3 N 4 , with g-C before modification 3 N 4 In contrast, the diffraction peak corresponding to the (100) crystal plane is missing in the XRD spectrum, which is caused by the preferred orientation of the crystal plane; and the position of the diffraction peak corresponding...

Embodiment 2

[0046] First, weigh 10g of urea with an electronic analytical balance, and then weigh 0.2g of NaBH 4 (i.e. urea and NaBH 4 The mass ratio is 50:1), put it into a mortar, grind for 20 minutes to mix all components well, then put it into a 100ml crucible, cover it and heat it in a muffle furnace at a rate of 5°C / min rate, calcined at a high temperature of 550°C for 2h, and took out the sample after naturally cooling to room temperature with the furnace. The samples were centrifuged and washed three times with deionized water, dried in a drying oven at 60°C for 24 hours, and finally collected.

[0047] XRD spectrum ( figure 1 (c)) shows that for the addition of 0.2g of NaBH 4 Modified g-C 3 N 4 , with g-C before modification 3 N 4 In contrast, the diffraction peak corresponding to the (100) crystal plane is missing in the XRD spectrum, which is caused by the preferred orientation of the crystal plane; and the position of the diffraction peak corresponding to the (002) crys...

Embodiment 3

[0049] First, weigh 10g of urea with an electronic analytical balance, and then weigh 0.4g of NaBH 4 (i.e. urea and NaBH 4 The mass ratio is 25:1), put it into a mortar, grind for 20 minutes to mix all components well, then put it into a 100ml crucible, cover it and heat it in a muffle furnace at a rate of 5°C / min rate, calcined at a high temperature of 550°C for 2h, and took out the sample after naturally cooling to room temperature with the furnace. The samples were centrifuged and washed three times with deionized water, dried in a drying oven at 60°C for 24 hours, and finally collected.

[0050] XRD spectrum ( figure 1 (d)) shows that for the addition of 0.4g of NaBH 4 Modified g-C 3 N 4 , with g-C before modification 3 N 4 In contrast, the diffraction peak corresponding to the (100) crystal plane is missing in the XRD spectrum, and the diffraction peak corresponding to the (101) crystal plane appears near 43°, which is caused by the preferred orientation of the cry...

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Abstract

The invention discloses a method for efficiently treating Cr-containing 6+ (B,O) co-doping g‑C of wastewater 3 N 4 The preparation method of photocatalyst, this preparation method comprises the following steps: Step 1, takes by weighing 8-12g of urea, NaBH 4 0.1g‑0.8g, and urea and NaBH 4 Put it into a mortar, grind for 10-30min so that the two components are evenly mixed to obtain a mixture A; step 2, put the mixture A into a crucible, cover it, and place it in a muffle furnace for calcination for 1-3 hours. After naturally cooling to room temperature, take out the semi-finished product; step 3, centrifuge and wash the semi-finished product with deionized water for 3-5 times, then dry for 24-36 hours to obtain (B, O) co-doped g-C 3 N 4 catalyst of light. Compared with the prior art, the photocatalytic reduction of Cr in the present invention 6+ The waste water has high efficiency, simple preparation method and low cost, and is suitable for industrialization.

Description

technical field [0001] The invention belongs to Cr 6+ The technical field of catalytic reduction, specifically relates to a method for efficiently treating Cr-containing 6+ (B, O) co-doping g-C of wastewater 3 N 4 Preparation method of photocatalyst. Background technique [0002] Heavy metal pollution is the most important source of water pollution in my country, and chromium is one of them. Chromium in water mainly includes trivalent chromium (Cr(III) or Cr 3+ ) and hexavalent chromium (Cr(VI) or Cr 6+ ) in two ways. Among them, hexavalent chromium is an ingestion poison / inhalation poison, and skin contact may cause sensitivity; it is more likely to cause hereditary gene defects, and has a persistent danger to the environment. Hexavalent chromium is easily absorbed by the human body, and it can invade the human body through digestion, respiratory tract, skin and mucous membranes. It has been reported that when breathing air containing different concentrations of chr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/22
CPCB01J27/24B01J35/004C02F1/30C02F2101/22C02F2305/10
Inventor 董鹏玉李皓奚新国肖丽娜孟承启刘大兴王亚娟陈小卫
Owner 广东沁华智能环境技术股份有限公司
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