Preparation method of biosurfactants-modified nano-iron/carbon composite material and application in removing nitrate nitrogen in underground water

A technology of carbon composite material and biological surface, applied in the direction of contaminated groundwater/leachate treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve pollution, rare and other problems

Inactive Publication Date: 2016-03-16
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the introduction of heavy metals into groundwater may pose a contamination risk
[0006] Biosurfactants are widely used in food, cosmetics, agriculture and petrochemical industries due to...

Method used

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  • Preparation method of biosurfactants-modified nano-iron/carbon composite material and application in removing nitrate nitrogen in underground water
  • Preparation method of biosurfactants-modified nano-iron/carbon composite material and application in removing nitrate nitrogen in underground water
  • Preparation method of biosurfactants-modified nano-iron/carbon composite material and application in removing nitrate nitrogen in underground water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation of embodiment one nano-iron / carbon composite material

[0043] Nano-iron was prepared by liquid phase reduction method and loaded on activated carbon to form nano-iron / carbon composites. The reaction equation is as follows:

[0044] Fe 2+ (EQ) +2BH 4 - (EQ) +6H 2 o (I) → Fe 0 (S) ↓+B(OH) 3(EQ) +H 2(g) ↑

[0045] Preparation method: Measure 140mL of deoxygenated ultrapure water and 66mL of absolute ethanol, mix them to form an alcohol-water system and transfer them to a three-necked flask, fix the flask on an electric stirrer, start the stirrer and adjust the speed to 500rpm (rev / min ), to prepare the alcohol-water system. Weigh 1.8g of sodium borohydride solid, dissolve in 10ml of deoxygenated ultrapure water, and set aside. Take another 5 g of ferrous sulfate heptahydrate, dissolve ferrous sulfate heptahydrate in the alcoholic water system, and after it is completely dissolved, add the newly prepared sodium borohydride solution into the fl...

Embodiment 2

[0047] Preparation of Example 2 Modified Nano-iron / Carbon Composite Material

[0048] In addition to dissolving the biosurfactant rhamnoside aglycone and sapindus saponin in the alcohol-water system before dissolving ferrous sulfate heptahydrate, the preparation method of the modified nano-iron / carbon composite material, other materials, The reaction conditions and steps are the same as the preparation of nano-iron / carbon in Example 1. Among them, the feeding amount of rhamnolipid (Daqing Wotaisi Chemical Co., Ltd.), tea saponin (Xi'an Jiatian Biotechnology Co., Ltd.), and Sapindus saponin (Xi'an Jiatian Biotechnology Co., Ltd.) is shown in Table 1 :

[0049] Table 1: The feeding amount of rhamnolipid, tea saponin aglycon and sapindus saponin

[0050]

[0051] In this table, the calculation method of the amount of lyglycolipid and Sapindus sapindus saponin is: in terms of mass percentage, the ratio to the total amount of the reaction material (the sum of the amount of sod...

Embodiment 3

[0052] Embodiment 3 SEM characterization diagram

[0053] The nano-iron / carbon composite material prepared in Example 1 is characterized and analyzed by a scanning electron microscope. The SEM characterization diagram (scanning electron microscope characterization diagram) of the nano-iron / carbon composite material is shown in the appendix of the specification. Figure 5 (a). Among them, the sheet-like structure is activated carbon, and the particles adsorbed on the surface are nano-iron. Experiments show that the nano-iron particles in the unmodified nano-iron / carbon are not well attached to the activated carbon, and the agglomeration is obvious.

[0054] The modified nano-iron / carbon composite materials prepared in Example 2 of tea saponin modified group 4, rhamnolipid modified group 3, and Sapindus saponin modified group 3 were characterized and analyzed by scanning electron microscopy, and the nano-iron The SEM characterization diagram (scanning electron microscope chara...

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Abstract

The invention belongs to the field of groundwater pollution remediation and specifically discloses biosurfactants-modified nano-iron/carbon and its preparation method and application. The biosurfactants-modified nano-iron/carbon can minimize agglomeration of nano-iron and raise dispersion stability and will not cause secondary pollution. Three biosurfactants including tea saponin, sapindus-saponin and rhamnolipid are used to modify nano-iron, and the modified nano-iron is attached to active carbon, thus removing NO3<->-N in water. Through batch testing, a sedimentation test and a migration test, modification effect on the nano-iron/carbon composite material and its influence on removal efficiency of NO3<->-N are analyzed. The invention provides new thinking and a new method for application of the composite material in groundwater pollution remediation.

Description

[0001] Technical field: the invention belongs to the field of groundwater pollution remediation, and specifically discloses a class of biosurfactant-modified nano-iron / carbon and its preparation method and application Background technique: [0002] Due to the excessive use of agricultural nitrogen fertilizers, substandard discharge of nitrogen-containing industrial and domestic wastewater, leaching and infiltration of solid waste, etc., serious nitrate pollution in groundwater has been caused (Bi Jingjing et al., 2010). In 2003, the European Environment Agency found that 80% of Spain, 50% of Britain, 36% of Germany, 34% of France, and 32% of Italy had an average concentration of nitrate nitrogen greater than 25mg / L (BussSetal ., 2008). In countries such as Belgium and Egypt, 50-75Kg / ha of nitrogen fertilizer is excessively used (V.G.Mineevetal., 2015). In my country, shallow groundwater in more than half of the area is polluted by nitrate nitrogen, seriously affecting groundw...

Claims

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Application Information

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IPC IPC(8): C02F1/72
CPCC02F1/72C02F2101/163C02F2103/06
Inventor 刘国高阳阳夏蕾陈春梅陈政阳
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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