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A photocatalytic method for the synergistic removal of heavy metal-organic pollutants in water based on natural pyrite

A heavy metal and natural yellow technology, applied in the field of photocatalysis, achieves good application prospects, reduced toxicity, and simple treatment process

Active Publication Date: 2017-08-25
SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing environmental remediation technologies are aimed at water bodies polluted by heavy metals or organic substances. Therefore, it has become the most important issue in environmental science to find an efficient environmental remediation method that can simultaneously remove heavy metals and organic pollutants in water bodies.
Based on the photocatalytic oxidation and reduction properties of pyrite semiconductors, pyrite is used as a photocatalyst to synergistically remove heavy metal-organic pollutants in water under ultraviolet light. However, so far, no similar patented technology has been reported.

Method used

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  • A photocatalytic method for the synergistic removal of heavy metal-organic pollutants in water based on natural pyrite
  • A photocatalytic method for the synergistic removal of heavy metal-organic pollutants in water based on natural pyrite
  • A photocatalytic method for the synergistic removal of heavy metal-organic pollutants in water based on natural pyrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First crush, grind, and sieve the catalyst pyrite so that the particle radius is within the range of 20-40 μm; adjust the pH value of the water body containing heavy metal Cr(Ⅵ) and organic malachite green to 2-7; under the condition of ultraviolet light , add 1.0g / L of treated catalyst pyrite to the water body containing 10mg / L heavy metal Cr(Ⅵ) and 30mg / L organic matter malachite green, and keep stirring at a constant speed under 10-20W ultraviolet light irradiation , carry out the reaction, react for 100-120min, redox synergistically remove Cr(Ⅵ) and malachite green in the water body. The concentration changes of Cr(Ⅵ) and malachite green in the water before and after the reaction were measured.

[0038] In Example 1 results such as figure 1 shown by figure 1 It can be seen that after 120 min of reaction, the removal rate of Cr(Ⅵ) and malachite green showed a downward trend with the increase of pH, among which, the removal rate of malachite green and Cr(Ⅵ) was the ...

Embodiment 2

[0046] The difference from Example 1 is that the initial pH value of the polluted water body is adjusted to be 3, the dosage of the catalyst pyrite is 0.5~1.5g / L, and the concentration of Cr(Ⅵ) and malachite green in the water body before and after the reaction is measured. Variety. In Example 2 results such as figure 2 shown by figure 2 It can be seen that after 120 minutes of reaction, the removal rate of malachite green and Cr(Ⅵ) showed an upward trend with the increase of the dosage of pyrite photocatalyst. When the dosage was 1.0g / L, The removal rate of malachite green and Cr(Ⅵ) almost reached the maximum value. When the dosage exceeds 1.0g / L, the removal rate of malachite green and Cr(Ⅵ) has no change.

Embodiment 3

[0048] The difference from Example 1 is that the concentration ratio of malachite green and Cr(VI) should be adjusted to 12:1-1:1, and the concentration changes of Cr(VI) and malachite green in the water before and after the reaction were measured. In embodiment 3 results such as image 3 shown by image 3 It can be seen that after 120 min of reaction, the removal rate of Cr(Ⅵ) decreased with the decrease of the concentration ratio, while the removal of malachite green first increased with the decrease of the concentration ratio. When the concentration ratio exceeded 3:1, the malachite green The removal rate of stone green decreased with the decrease of the concentration ratio. Therefore, when the ratio of malachite green / Cr(Ⅵ) was 3:1, the removal rates of malachite green and Cr(Ⅵ) reached the maximum respectively.

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Abstract

The invention discloses a natural pyrite based photocatalysis method for synergic removal of heavy metal-organic pollutants from water. The catalyst pyrite involved in the photocatalysis system is crushed, ground and sieved, and then composes a pyrite photocatalysis system together with ultraviolet. The pyrite photocatalysis technology involved in the invention can be applied to synergic removal of heavy metal Cr (VI) and organic matter malachite green from water. Under ultraviolet irradiation, the removal rates of malachite green and Cr (VI) can respectively reach 97% and 52%. The pyrite photocatalyst has good repeated use performance, can maintain good reaction activity after five times of repeated use, and is fully used. The catalytic reaction operation conditions involved in the reaction are simple, and the catalyst raw materials are cheap and easily available. Based on the pollution treatment concept of using waste to treat waste, the method provided by the invention has good application prospects.

Description

[0001] Technical field: [0002] The invention relates to a water treatment method containing heavy metal-organic pollutants, in particular to a photocatalytic method based on natural pyrite that can synergistically remove heavy metal-organic pollutants in water. [0003] Background technique: [0004] At present, with the rapid development of industry and the rapid improvement of the economic level, the substances that human beings demand and discharge from nature have reached an unprecedented level, far exceeding the capacity of the environment itself, thus causing serious damage to the environmental ecological system. a series of environmental pollution problems. In the face of the current severe environmental pollution situation, some traditional environmental restoration methods such as chemical precipitation, physical adsorption, chemical oxidation, and microbial treatment have been applied to the currently polluted environmental media. At present, the control of environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/70C02F1/62C02F1/32C02F101/22
Inventor 刁增辉徐向荣孙毓鑫刘珊
Owner SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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