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Nitrogen ligand chelate resin nanoscale zero-valent iron-loaded composite material and method thereof for reduction of bromate in water

A nano-zero valent iron, chelating resin technology, applied in the reduction water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of high treatment cost, secondary pollutants, low removal rate, etc. , to achieve the effect of stable performance and rapid degradation ability

Inactive Publication Date: 2013-03-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the existing water treatment method can't remove the bromate produced in the pretreatment process of drinking water well, there are disadvantages such as low removal rate, high treatment cost, and secondary pollutants

Method used

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  • Nitrogen ligand chelate resin nanoscale zero-valent iron-loaded composite material and method thereof for reduction of bromate in water
  • Nitrogen ligand chelate resin nanoscale zero-valent iron-loaded composite material and method thereof for reduction of bromate in water
  • Nitrogen ligand chelate resin nanoscale zero-valent iron-loaded composite material and method thereof for reduction of bromate in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A nitrogen ligand chelating resin loaded nanometer zero-valent iron composite material, the synthesis method of which is as follows:

[0029] (1) Put 4ml Reillex 402 into a glass adsorption column of Ф1.0cm×20cm, add 0.2% (W / W), pH=2.4 Fe 3+ The solution was loaded with metal ions through the adsorption column, which was recorded as Reillex 402-Fe after loading for 24 hours, and then the Reillex 402-Fe was poured out of the glass column and washed with deionized water until neutral.

[0030] (2) NaBH with a concentration of 0.2mol / L 4 Mix 200ml of aqueous solution with Reillex 402-Fe in a three-necked flask while stirring with a stirring paddle, NaBH 4 The aqueous solution is deoxygenated beforehand. When NaBH 4 When the solution was added dropwise to the three-necked flask, the resin immediately turned black. After the dropwise addition was completed and the reaction was continued for 2 hours, the material was filtered, rinsed with an ethanol solution except peroxy...

Embodiment 2

[0033] Step is the same as embodiment 1, but the 0.2% (W / W) in the step, the Fe of pH=2.4 3+ The aqueous solution is replaced by Fe with p H=3.5 2+ Aqueous solution, other conditions remain unchanged, the iron loading amount of the material is 90mg / g. For BrO 3 - The working capacity was 0.656g / l, and no iron ions were detected throughout the process.

Embodiment 3

[0035] The steps are the same as in Example 1, but the Reillex 402 resin in the step is replaced by Reillex 425 resin, other conditions are unchanged, and the iron loading amount of the material is 124 mg / g. For BrO 3 - The working capacity was 1.077 g / l, and no iron ions were detected throughout the process.

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Abstract

The present invention discloses a nitrogen ligand chelate resin nanoscale zero-valent iron-loaded composite material and application thereof for reduction of bromate in water, and belongs to the field of drinking water advanced treatment. The structure of the composite material is that: (1) the carrier of the composite material is the chelate resin having a pyridyl group, and (2) inner and outer surfaces of the carrier loads nanoscale zero-valent iron, wherein the preparation of the zero-valent iron includes guiding Fe3+ or Fe2+ by chelation into the inner and outer surfaces of the resin, reducing to zero-valent iron by using sodium borohydride, and vacuum drying to obtain the zero-valent iron composite material. The step of bromate reduction in water includes: passing a bromated-containing solution through a fixed bed adsorption column loaded with the nitrogen ligand chelate resin nanoscale zero-valent iron-loaded composite material. Treated by the present invention, the BrO3- concentration at the adsorption column outlet can be reduced to below 10 [mu]g / L. The composite material overcomes the problem that the reduction efficiency of ordinary iron element is low, and the release of iron ions is excessive during the reduction of pollutants, realizes the reduction of bromate well, and is a highly efficient and rapid material for pollutant degradation.

Description

technical field [0001] The invention relates to a high-performance environmental functional composite material and its application, in particular to a composite material loaded with nanometer zero-valent iron and a method for reducing bromate solution. Background technique [0002] Bromate (BrO 3 - ) is a disinfection by-product commonly produced during the ozonation of drinking water containing bromide ions. The International Agency for Research on Cancer (IRAC) has classified bromate as a potential carcinogen of Class 2B (higher carcinogenic potential), and various countries and organizations have set corresponding standards for bromate. In 1993, the World Health Organization (WHO) set the limit value of bromate as 25ug / L in the "Guidelines for Drinking Water Quality", which was revised to 10 ug / L in 2004. The United States Environmental Protection Agency (USEPA) stipulates that the maximum concentration of bromate in drinking water is 10 ug / L. The newly revised "Drink...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F1/58
Inventor 龙超伊胜楠史嘉璐李爱民
Owner NANJING UNIV
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