Applications of nanometer iron-palladium double-metal composite material, method for removing nitrates and phosphates in water, and subsequent treatment method

A composite material and nano-iron technology, which is applied in the field of environmental functional composite materials, can solve the problems of incomplete removal of nitrate, inability to remove nitrate and phosphate at the same time, a large amount of high concentration, etc., to achieve efficient reduction, easy operation, and selection sex high effect

Active Publication Date: 2015-03-04
NANJING UNIV
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Problems solved by technology

[0008] In view of the problems existing in the process of treating nitrate and phosphate in water bodies in the prior art, such as: the removal of nitrate is not complete or a large amount of high-concentration regeneration waste liquid is generated, and nitrate and phosphate in water bodies cannot be removed at the same time, the present invention provides The application of nano-iron-palladium bimetallic composite material and the method and follow-up treatment method for removing nitrate and phosphate in water, using nitrogen-containing pyridyl chelating resin as a carrier, loading nano-iron-palladium bimetal on the carrier, the material is resistant to nitric acid The root has a good reduction effect, and can selectively convert nitrate into nitrogen, which not only avoids the production of a large amount of ammonia nitrogen in the reduction product, but also realizes the conversion of nitrate into nitrogen without using hydrogen as a reducing agent. the goal of

Method used

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  • Applications of nanometer iron-palladium double-metal composite material, method for removing nitrates and phosphates in water, and subsequent treatment method
  • Applications of nanometer iron-palladium double-metal composite material, method for removing nitrates and phosphates in water, and subsequent treatment method
  • Applications of nanometer iron-palladium double-metal composite material, method for removing nitrates and phosphates in water, and subsequent treatment method

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Embodiment 1

[0039] A method for preparing a loaded nano-iron-palladium bimetallic composite, the steps of which are:

[0040] (a) 1g resin carrier DOWEX TM Add M4195 to 500mL containing Fe 3+ solution, where Fe 3+ The mass concentration is 2g / L, Fe 3+ The pH value of the solution was 2, shaken in a constant temperature shaking incubator at 30°C for 24 hours, and the carrier material was taken out to obtain Fe-chelated 3+ carrier material;

[0041] (b) the chelated iron taken out in step (a) has Fe 3+ The carrier material, added to 200mL containing Pd 2+ solution, where Pd 2+ The mass concentration is 300mg / L, Pd 2+ The pH value of the solution is 2, shake in a constant temperature shaking incubator at 30°C for 10 hours, and take out the secondary load carrier material;

[0042] (c) Put the secondary load carrier material obtained in step (b) into a three-necked flask, add dropwise 200mL of a mass concentration of 1% sodium borohydride solution, stir and react for 2 hours, then che...

Embodiment 2

[0049] With embodiment 1, difference is: the resin carrier in the step (a) is changed into DOWEX TM XFS43084, Fe 3+ The solution was changed to Fe 2+ solution, Fe 2+ The mass concentration is 5g / L, Fe 2+ The pH value of the solution was 4, and shaken in a constant temperature shaking incubator for 20 hours at 30 ° C; the Pd in ​​step (b) 2+ The mass concentration is 700mg / L, Pd 2+ The pH value of solution is 4, shakes 8 hours in constant temperature vibration incubator under 30 ℃, and sodium borohydride solution mass concentration is 5% in step (c), the hydrochloric acid solution concentration in step (1) is 100mmol / L, other Conditions remain the same, after 2 hours of reaction, the removal rate of phosphate in water is 100%, the removal rate of nitrate is 96%, the selectivity of nitrogen in the reduction product is 87%, and no metal ion is detected during the reaction. After repeated use for 3 times, the removal rate of phosphate is 90%, the removal rate of nitrate is 92...

Embodiment 3

[0051] With embodiment 1, difference is: in the step (a) Fe 3+ The mass concentration is 1g / L, Fe 3+ The pH value of solution is 3, shakes 10 hours in constant temperature vibration incubator under 30 ℃, and sodium borohydride solution mass concentration is 0.5% in the step (c); The pH value of the nitrate solution in the step (i) is adjusted to 8. Other conditions remain unchanged, after 3 hours of reaction, the removal rate of phosphate in the water body is 96%, the removal rate of nitrate is 99%, the selectivity of nitrogen in the reduction product is 85%, and there is no metal ion in the reaction process Check out. After repeated use for 3 times, the removal rate of phosphate is 92%, the removal rate of nitrate is 88%, and the selectivity to nitrogen in the reduction product is 72%.

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Abstract

The present invention discloses applications of a nanometer iron-palladium double-metal composite material, a method for removing nitrates and phosphates in water, and a subsequent treatment method, and belongs to the field of environmental function composite materials. The preparation method of the loaded nanometer iron-palladium double-metal composite material comprises: respectively and sequentially loading Fe<3+> or Fe<2+> and Pd<2+> on a chelating resin containing the nitrogen pyridyl functional group in a chelating manner, adopting a NaBH4 solution to reduce the iron-palladium double-metal ion loaded on the resin, and carrying out vacuum drying to obtain the loaded iron-palladium double-metal composite material, wherein nitrates and phosphates in water can be synchronously removed, and the nitrate is reduced into the nitrogen gas. In addition, the hydrochloric acid solution is adopted to treat the failure loaded iron-palladium double-metal composite material, such that the composite material being subjected to the acid washing treatment can be recycled. According to the present invention, the nitrate removing efficiency and the phosphate removing efficiency are high, metal ion dissolution and other secondary pollution problems do not exist, the composite material can be reused, the operation condition is simple, and advantages of economy, environmental protection and the like are provided.

Description

technical field [0001] The invention belongs to the field of environmental functional composite materials, in particular, relates to a high-performance environmental functional composite material, more specifically, relates to the application of nano-iron-palladium bimetallic composite materials and the method and method for removing nitrate and phosphate in water bodies Subsequent processing method. Background technique [0002] Nitrogen and phosphorus are the main elements that cause eutrophication of water bodies. The discharge of industrial and urban sewage treatment plants is considered to be the main source of N and P that cause eutrophication of receiving water bodies. Since the implementation of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) on July 1, 2003, my country has put forward strict requirements for ammonia nitrogen, TN, and TP in the effluent of urban sewage treatment plants (TN<15mg / L, TP<0.5mg / L). At present, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/28C02F1/70B01J20/26B01J20/30B01J20/34B01J31/22B01J31/40
Inventor 龙超史嘉璐何宏磊杨成李爱民
Owner NANJING UNIV
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