Cuprous selenide cluster supported visible-light-induced catalyst with property of reducing Cr (VI) ions

A catalyst, visible light technology, applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, reduced water/sewage treatment, etc., can solve problems such as Cr(VI) ion pollution, achieve chemical conversion Contaminants are rapid, inexpensive, and cycle-reducing effects

Active Publication Date: 2016-09-21
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In order to solve the pollution problem caused by Cr(VI) ions in water, the present invention discloses a copper selenide cluster-supported visible light photocatalyst with reduced Cr(VI) ions

Method used

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  • Cuprous selenide cluster supported visible-light-induced catalyst with property of reducing Cr (VI) ions
  • Cuprous selenide cluster supported visible-light-induced catalyst with property of reducing Cr (VI) ions
  • Cuprous selenide cluster supported visible-light-induced catalyst with property of reducing Cr (VI) ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of cuprous selenide cluster-supported visible light catalyst C with the property of reducing Cr(VI) ions:

[0032] (1) Synthesis of the aromatic ring-containing selenoether ligand L: Take a 100 mL three-necked flask, repeatedly evacuate it with nitrogen for 3 times, measure 60 mL of ethanol, dry it with anhydrous magnesium sulfate, and add it to the three-necked flask. Weigh 0.156g of diphenyl diselenide (0.5mmol) and add it to a three-necked flask filled with nitrogen, repeatedly degas, ice bath for 3-8 minutes, weigh 0.7674g of 20 equivalents of sodium borohydride and add it to a three-necked flask, and the solution Immediately turn into a white emulsion, continue to ice bath for 15min, remove the ice bath, continue to react at room temperature for 2h, the solution gradually becomes a clear and transparent colorless solution, after 2h, weigh 0.098g (0.25mmol) 9-(3 -Bromo-2-bromomethylpropyl)anthracene was dissolved in a little refluxed tetrahydrofuran, and...

Embodiment 2

[0038] Prepare 4 groups of 30ml 1×10 -4 mol / L potassium dichromate aqueous solution, add respectively 20mg embodiment 1 and prepare gained catalyst C, TiO 2 , Ligand L and a group of blank experiments, stirred in the dark for 30 minutes and then turned on the light source to continue the reaction. Collect 3ml of reaction liquid samples every 30min, and measure the UV of each group of samples according to the above operation. Such as figure 2 Shown, λ>400nm, C 0 is the initial Cr(VI) concentration, C t It is the concentration of Cr(VI) changing with time. It can be seen from the analysis of the ultraviolet absorption spectrum that after the catalyst C is added, the absorption peak of the Cr(VI) ion at a wavelength of 540nm weakens and disappears with the reaction time, while the other groups do not occur. It can be seen that only catalyst C has visible light catalytic reduction activity.

Embodiment 3

[0040] Prepare 4 groups of 30ml 1×10 -4 10-40 mg of the catalyst C prepared in Example 1 was added to the mol / L aqueous solution of potassium dichromate, stirred in the dark for 30 min, and then the light source was turned on to continue the reaction. Collect 3ml of reaction liquid samples every 30min, and measure the UV of each group of samples according to the above operation. The result is as image 3 shown, where the initial concentration is 1×10 -4 mol / L, analyzing the ultraviolet absorption spectrum, it can be seen that as the input amount of catalyst increases from 10mg-20mg, the catalytic conversion rate increases obviously. When continuing to increase the amount of catalyst input to 40mg, the catalytic reduction time is not shortened, and when the input amount of catalyst is 20 mg, there is the best catalytic conversion efficiency.

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Abstract

The invention discloses a cuprous selenide cluster supported visible-light-induced catalyst with a property of reducing Cr (VI) ions. According to the principle of the catalyst, a selenide-containing aromatic nucleus ligand is designed, a cuprous cluster complex of the selenide-containing aromatic nucleus ligand is taken as a sensitizer, the selenide-containing aromatic nucleus ligand is supported to TiO2 through physical absorption step by step, and then the compounds are taken as the catalyst for characterizing optical properties; analysis validation is performed with a diphenylsemicarbazide color developing agent. The invention further discloses a preparation method of the catalyst. The catalyst performs catalysis only under irradiation of a visible light source; chemical conversion of pollutants is fast, and the period of water purification can be shortened; the selected compounds are stable, and secondary pollution caused by decomposition or difficulty in recycle can be avoided; a chemical material for wastewater treatment is abundant, low in cost, non-toxic and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of metal-organic photocatalytic materials, in particular to a cuprous selenide cluster-supported visible light catalyst capable of reducing Cr(VI) ions. Background technique [0002] Heavy metal ions in water are a common source of pollution. They are usually highly toxic and carcinogenic, which seriously threaten people's health and safety. Studies have shown that especially Cr(VI) ions are highly toxic, and inhalation of the human body can cause allergies, poisoning and gene defects to humans; at the same time, Cr(VI) is also very carcinogenic, excessive, especially Cr(VI) exceeding 10ppm has a lethal effect on aquatic organisms. The reduced trivalent chromium ions do not have these toxicity. [0003] In the past few years, traditional biological and physical treatment methods, including adsorption, ultrafiltration, coagulation, etc., have become mainstream technologies for removing pollutants from waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J31/38C02F1/30C02F1/70C02F1/62
CPCY02W10/37B01J31/22B01J31/38B01J35/004B01J2531/0211B01J2531/0222B01J2531/16C02F1/30C02F1/70C02F2305/10
Inventor 景苏吴敬伟吉玮李城安
Owner NANJING UNIV OF TECH
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