Method for reduction removal of heavy metal ions by phosphated nano zero-valent iron

A technology of nano-zero-valent iron and heavy metal ions, which is applied in the field of environmental pollution control, can solve the problems of poor electronic selectivity, weak adsorption capacity of heavy metal ions, weak removal capacity of heavy metal ions, etc., to promote adsorption, promote the ability of adsorption and reduction of heavy metal ions, Effects of Changing Electron Transport/Transfer Properties

Active Publication Date: 2019-01-15
HUAZHONG NORMAL UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of weak adsorption ability of nano zero-valent iron to heavy metal ions, poor electron selectivity, and wea

Method used

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  • Method for reduction removal of heavy metal ions by phosphated nano zero-valent iron
  • Method for reduction removal of heavy metal ions by phosphated nano zero-valent iron
  • Method for reduction removal of heavy metal ions by phosphated nano zero-valent iron

Examples

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Effect test

example 1

[0033] Example 1 phosphating nanometer zero-valent iron removes hexavalent chromium in polluted water (nano zero-valent iron dosage 0.2g / L, hexavalent chromium concentration is 5ppm);

[0034] The 400mL concentration is 0.4mol L -1 The sodium borohydride solution was added dropwise to 1000mL with a concentration of 0.1mol L -1 In the ferric chloride hexahydrate solution (time control in 10min), then immediately add potassium dihydrogen phosphate solid (the molar ratio n of phosphate and iron is successively: 0.0%, 0.2%, 0.4%, 0.6%, 0.8% , namely 0.0%, 0.2%, 0.4%, 0.6%, 0.8% P-nZVI), aged for 2h, filtered with suction, dried with an infrared lamp under argon gas (about 2h), turned off the infrared lamp, and dried under argon gas Under the condition of cooling to room temperature, the phosphided nanometer zero-valent iron is obtained. Such as figure 1 As shown, during the heating process of phosphating nano-zero-valent iron, the infrared spectrum is at 1335cm -1 to 1087cm -...

example 2

[0036] Example 2 phosphating nanometer zero-valent iron removes hexavalent chromium in polluted water (the dosage of nanometer zero-valent iron is 1g / L, and the concentration of hexavalent chromium is 25ppm);

[0037] 400mL concentration is 1.0mol L -1 The sodium borohydride solution was added dropwise to 1000mL with a concentration of 0.25mol L -1 Ferric chloride hexahydrate solution (time control in 10min), then immediately add potassium dihydrogen phosphate solid (the molar ratio n of phosphate and iron is successively: 0.0%, 0.2%, 0.4%, 0.6%, 0.8% , namely 0.0%, 0.2%, 0.4%, 0.6%, 0.8% P-nZVI), aged for 2h, filtered with suction, dried with an infrared lamp (about 2h) under argon gas conditions, turned off the infrared lamp, and dried under argon gas Under the condition of cooling to room temperature, the phosphided nanometer zero-valent iron is obtained. Use 50mL of potassium dichromate solution with a hexavalent chromium concentration of 25mg / L to simulate chromium-cont...

example 3

[0038] Example 3 phosphating nanometer zero-valent iron removes hexavalent chromium in polluted water (the dosage of nanometer zero-valent iron is 2g / L, and the concentration of hexavalent chromium is 50ppm);

[0039] The 400mL concentration is 2mol·L -1 The sodium borohydride solution was added dropwise to 1000mL with a concentration of 0.5mol L -1 Ferric chloride hexahydrate solution (time control in 10min), then immediately add potassium dihydrogen phosphate solid (the molar ratio n of phosphate and iron is successively: 0.0%, 0.2%, 0.4%, 0.6%, 0.8% , namely 0.0%, 0.2%, 0.4%, 0.6%, 0.8% P-nZVI), aged for 2h, filtered with suction, dried with an infrared lamp (about 2h) under argon gas conditions, turned off the infrared lamp, and dried under argon gas Under the condition of cooling to room temperature, the phosphided nanometer zero-valent iron is obtained. Use 50mL of potassium dichromate solution with a hexavalent chromium concentration of 50mg / L to simulate chromium-con...

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Abstract

The invention belongs to the field of environmental pollution control, in particular to a method for reduction removal of heavy metal ions by phosphated nano zero-valent iron. The method comprises thefollowing steps: dropwise adding a sodium borohydride solution into a ferric trichloride solution, immediately adding a phosphate, then aging, carrying out suction filtration, and drying to obtain phosphated nano zero-valent iron; adding the phosphated nano zero-valent iron into an aqueous solution containing the heavy metal ions to carry out reduction removal of heavy metals. According to the method, the problems that nano zero-valent iron is weak in metal ion adsorption capacity, poor in electron selectivity and weak in heavy metal ion reduction removal capability in the heavy metal pollution control process are solved, and the phosphated nano zero-valent iron has the advantages of being efficient and green.

Description

technical field [0001] The invention belongs to the field of environmental pollution control, specifically relates to the control and restoration of heavy metal ions in water bodies, and is applicable to the treatment of waste water in various industrial fields. technical background [0002] Heavy metals (chromium (Cr), arsenic (As), lead (Pb), cadmium (Cd), copper (Cu), nickel (Ni), zinc (Zn), tin (Sn), cobalt (Co), antimony (Sb ), mercury (Hg)) and so on are used in industry, agriculture, science and technology, and daily life, and are released into the environment through various channels, resulting in a continuous increase in the total amount of heavy metal pollution in the environment. Heavy metal pollution has the characteristics of easy accumulation, irreversibility, high toxicity, slow metabolism and easy enrichment, which seriously endangers the healthy life of human beings and hinders the sustainable development of society. Therefore, it is imminent to develop gre...

Claims

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Application Information

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IPC IPC(8): C02F1/70B82Y30/00B82Y40/00C02F101/20C02F101/22
CPCB82Y30/00B82Y40/00C02F1/70C02F2101/20C02F2101/22
Inventor 艾智慧李美琪张礼知
Owner HUAZHONG NORMAL UNIV
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