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an alpha-fe 2 o 3 -zno/gangue composite photocatalyst and preparation method and application thereof

A technology of -fe2o3-zno and coal gangue, which is applied in the field of photocatalyst preparation and can solve problems that have not been reported yet

Active Publication Date: 2021-02-05
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] So far, no information about α-Fe 2 o 3 -Report of ZnO / coal gangue composite photocatalyst

Method used

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  • an alpha-fe <sub>2</sub> o <sub>3</sub> -zno/gangue composite photocatalyst and preparation method and application thereof
  • an alpha-fe <sub>2</sub> o <sub>3</sub> -zno/gangue composite photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Coal gangue from the Pingshuo mining area in Shanxi was crushed and fully ground, passed through a 200-mesh sieve, and calcined at 700 °C for 2 h for later use. At the same time, the preparation of Fe 3+ Iron salt solution with an ion concentration of 0.2 mol / L, Zn 2+ Zinc salt solution with ion concentration of 0.1 mol / L, 6 mol / L and 0.1 mol / L sodium hydroxide aqueous solution are used for later use.

[0046] 20 mL of zinc sulfate aqueous solution (Zn 2+ The ion concentration is 0.1 mol / L) and the calculated amount of ferric nitrate aqueous solution (Fe 3 + ion concentration of 0.2 mol / L) into a three-neck flask, distilled water to a volume of 100 mL, added 5 g of pretreated coal gangue powder, stirred magnetically for 1 h, and slowly added 6 mol / L and 0.1 mol / L of sodium hydroxide aqueous solution, the pH value of the reaction system was adjusted to 9 by controlling the addition of sodium hydroxide aqueous solution, and boiling refluxed for 3 h. After suction fi...

Embodiment 2~6

[0047] Embodiment 2~6 and comparative example 1~4

[0048] The operation steps of Examples 2-6 and Comparative Examples 1-4 are the same as those of Example 1, the difference is only in the type of zinc salt and iron salt used, the amount of iron salt aqueous solution, the coal gangue calcination temperature, the coal gangue amount and the pH of the reaction system values, as shown in Table 1.

[0049] Table 1 Examples 2~6 and Comparative Examples 1~4

[0050] .

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Abstract

The present invention relates to a kind of α-Fe 2 o 3 ‑ZnO / coal gangue composite photocatalyst, which comprises the following raw materials prepared by boiling reflux: pretreated coal gangue, an aqueous solution of zinc salt and an aqueous solution of iron salt; Fe in the aqueous solution of iron salt 3+ Zn in an aqueous solution of ions and zinc salts 2+ The molar ratio of ion is 2:1~10, and Zn in the aqueous solution of described zinc salt 2+ The mass ratio of the moles of ions to the pretreated gangue is 0.002 mol:5 g. The present invention also relates to a method for preparing the composite photocatalyst and its application. The product of the invention can effectively degrade chlorophenol compounds under the condition of ultraviolet-visible light. The preparation method of the invention has the characteristics of less raw materials, simple process, short reaction time, relatively mild conditions and no pollution to the environment, is a green synthesis process, and is easy to realize industrialization.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation, in particular to an α-Fe 2 o 3 -ZnO / coal gangue composite photocatalyst, its preparation method and its application in the degradation of chlorophenol compounds. Background technique [0002] Photocatalytic technology can directly use light energy to degrade organic pollutants into small inorganic molecules under normal temperature and pressure, and has the characteristics of low energy consumption, simple operation, mild reaction conditions, and small secondary pollution. It is an ideal environmental pollution governance technology. In today's increasingly tense fossil energy and increasingly serious environmental pollution, the importance of photocatalytic technology is self-evident, and its core is to research and develop photocatalysts with excellent performance. [0003] The common photocatalytic material is TiO 2 , SnO 2 , CdS, WO 3 , ZrO 2 and Fe 2 o 3 and other n-type sem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B01J37/10C02F1/30C02F1/72C02F101/36C02F101/34
CPCC02F1/30C02F1/725B01J23/002B01J23/80B01J37/10C02F2101/36C02F2101/345C02F2305/10B01J35/39
Inventor 谢娟杜红霞许永权赵树春张国刚赵华许红
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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