Method for preparing mercuric sulfide (HgS) quantum dots by using mercury-containing wastewater

A technology of quantum dots and mercury sulfide, applied in chemical instruments and methods, mercury compounds, inorganic chemistry, etc., to achieve the effect of reducing processing costs, cheap prices, and less environmental hazards

Inactive Publication Date: 2012-08-15
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, there is no literature report on the preparation of semiconductor quantum dots by using mercury-containing wastewater

Method used

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  • Method for preparing mercuric sulfide (HgS) quantum dots by using mercury-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Hg in mercury-containing wastewater 2+ Transfer to the organic phase: take 10 ml of 0.1 mol / L mercury-containing wastewater, add 1.2 mmol oleylamine, 20 ml ethanol, and 30 ml n-hexane. Stir the system so that it is at 50 o C for 40 min. After the reaction, the system was cooled to room temperature, and the calculated Hg 2+ The phase transfer rate is 97.9%.

Embodiment 2

[0039] Preparation of HgS quantum dots by conventional solvothermal method: Take 10 ml of 0.02 mol / L mercury-containing wastewater, add 3.0 mmol oleylamine, 20 ml ethanol, and 30 ml n-hexane. Stir the system so that it is at 50 o C for 30 min. After the system was cooled to room temperature, it was transferred to a hydrothermal reaction kettle, 2 mmol thiourea was added, and then the reaction kettle was sealed and heated to 180°C in a heating box. o C, constant temperature for 24 h. After the reaction, the reaction system was separated, the lower aqueous phase was removed, the upper organic phase containing HgS quantum dots was centrifuged, and the obtained black solid particles were dispersed with n-hexane.

Embodiment 3

[0041] Preparation of HgS quantum dots by microwave solvothermal method: Take 10 ml of 0.02 mol / L mercury-containing wastewater, add 3.0 mmol oleylamine, 20 ml ethanol, and 30 ml n-hexane. Stir the system so that it is at 50 o C for 30 min. Then add 3 mmol sulfur powder and continue to stir until the sulfur powder dissolves. Afterwards, the solution system was transferred to the microwave reactor, and at 150 o C microwave reaction for 20 min. After the reaction, the reaction system was separated into liquids, the lower aqueous phase was removed, and the upper organic phase containing HgS quantum dots was centrifuged to obtain black solid particles dispersed with n-hexane.

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Abstract

The invention provides a method for preparing mercuric sulfide (HgS) quantum dots by using mercury-containing wastewater. The method mainly comprises the following steps of: enabling Hg<2+> to react with an organic complexing agent so as to form a mercuric organic complex and transferring the Hg<2+> in a water phase into an oil phase through a phase transfer method; and introducing a sulfur source, and enabling the mercuric organic complex to be combined with the sulfur source so as to produce HgS semiconductor quantum dots respectively through a mixed solvothermal method, a low-temperature stirring method and a high-temperature activation method. According to the method for preparing the HgS quantum dots by using the mercury-containing wastewater, the mercury-containing wastewater can be effectively treated and then can reach the national emission standards (the mercury content is lower than 0.05 mg/L), and the HgS semiconductor quantum dots with a higher application value are synthesized, so that get a double advantage, and the effect of changing waste into valuable is achieved. Moreover, the drugs needed in the method are little in environmental hazard and low in cost, the treatment cost is lowered, and the method for preparing the HgS quantum dots by using the mercury-containing wastewater is especially applicable to the treatment of high-concentration mercury-containing wastewater.

Description

technical field [0001] The invention relates to a method for treating mercury-containing wastewater, in particular to a method for converting mercury-containing wastewater into mercury sulfide (HgS) quantum dots, and belongs to the fields of environmental pollution control and nanomaterial synthesis. Background technique [0002] Mercury-containing wastewater is one of the most serious environmental pollution industrial wastewater, mainly from chlor-alkali, non-ferrous metal smelting, chemical industry, mercury preparation pesticide, papermaking, dyestuff and thermal instrumentation and other industries. If the wastewater is not treated properly, it will not only cause serious environmental pollution, but also endanger human health. At present, researchers have carried out a lot of research, through a variety of methods to deal with mercury-containing wastewater. [0003] The journal "Shandong Chemical Industry" No. 6, 2007, on pages 17 to 22, reported an article written by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G13/00B82Y40/00
Inventor 宿新泰葛建华杨超李怡招王吉德
Owner XINJIANG UNIVERSITY
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