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Method of degrading glyphosate in water body

A technology of glyphosate and water bodies, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of secondary pollution, general effect, difficult to popularize, etc., achieve high oxygen storage capacity, operation Simple, easy-to-promote effects

Inactive Publication Date: 2019-04-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN108585336A discloses a treatment method of glyphosate mother liquor wet oxidation series catalytic wet oxidation. The core of the method is to use ceramic-activated carbon as a carrier, loaded with precious metal ruthenium to make a heterogeneous catalyst, and use air as an oxidant to degrade glyphosate , the cost of precious metals is high, it is not easy to popularize, and the gas-liquid two-phase mass transfer is hindered, and the oxidation ability of air itself is limited, so the effect of this method is average, and the preparation method and process are relatively cumbersome
CN105461127A discloses a method for treating glyphosate wastewater, the method mainly adopts Fe 3+ Pre-oxidize wastewater, and then add Fenton's reagent to deeply oxidize wastewater. This method uses ionic Fe 3+ with Fe 2+ , will cause the formation of iron sludge, the catalyst will not only be unrecyclable, but will also cause secondary pollution, and the price of hydrogen peroxide is relatively high, so the practical application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Pretreatment of honeycomb ceramic filler: take 30mL of oxalic acid solution with a mass fraction of 30% in a flask, add 5g of honeycomb ceramic filler (ingredient: cordierite), boil and condense to reflux for 0.5h, wash with deionized water after cooling pH = 4, and then dried in an oven at 50°C for 12 hours for later use.

[0029] (2) Preparation of Co 3 o 4 -CeO 2 / CH catalyst: Weigh 2.91gCo(NO 3 ) 2 ·6H 2 O, 4.34gCe(NO 3 ) 2 ·6H 2 O and 10gAl(OH) 3 Dissolve in 50mL deionized water, stir for 1h, drop 5 drops of aluminum sol and mix thoroughly to form a mixed solution. Take the pretreated CH in step (1) and soak it in the above mixed solution for 1 hour, take it out, blow off the remaining liquid in the channel with nitrogen gas at a flow rate of 10 mL / min, place it in an oven at 50°C for 1 hour, and repeat the soaking and drying for 3 hours. times; then placed in a muffle furnace for calcination at 300°C for 2h, with a heating rate of 50°C·h -1 , that i...

Embodiment 2

[0032](1) Pretreatment of honeycomb ceramic filler: take 50mL of oxalic acid solution with a mass fraction of 50% in a flask, add 10g of honeycomb ceramic filler (ingredient: aluminum powder), boil and condense to reflux for 1h, wash with deionized water to pH after cooling =7, and then dried in an oven at 100°C for 24 hours for later use.

[0033] (2) Preparation of Co 3 o 4 -CeO 2 / CH catalyst: Weigh 17.46gCo(NO 3 ) 2 ·6H 2 O, 8.68gCe(NO 3 ) 2 ·6H 2 O with 20gAl(OH) 3 Dissolve in 150mL deionized water, stir for 2 hours, drop 10 drops of aluminum sol and mix thoroughly to form a mixed solution. Take the pretreated CH in step (1) and immerse it in the above mixed solution for 2 hours, take it out, blow off the residual liquid in the channels with nitrogen gas with a flow rate of 13 mL / min, place it in an oven at 100°C for 2 hours, and repeat the immersion and drying for 4 hours. Second-rate. Then put it into a muffle furnace for calcination at 600°C for 3h, with a h...

Embodiment 3

[0036] (1) Pretreatment of honeycomb ceramic filler: get 70mL mass fraction and be 70% oxalic acid solution in the flask, add 15g honeycomb ceramic filler (ingredient: cordierite), boil and condense and reflux for 1.5h, wash with deionized water after cooling pH = 10, and then dried in an oven at 150°C for 48 hours for use.

[0037] (2) Preparation of Co 3 o 4 -CeO 2 / CH catalyst: Weigh 29.10gCo(NO 3 ) 2 ·6H 2 O, 13.02gCe(NO 3 ) 2 ·6H 2 O with 30gAl(OH) 3 Dissolve in 250mL deionized water, stir for 3 hours, drop 15 drops of aluminum sol and mix thoroughly to form a mixed solution. Take the pretreated CH in step (1) and soak it in the above mixed solution for 5 hours, take it out, blow off the residual liquid in the channels with nitrogen gas with a flow rate of 15mL / min, put it in an oven at 150°C for 3 hours, and repeat the immersion and drying for 5 hours. Second-rate. Then put it into a muffle furnace for calcination at 900°C for 5h, and the heating rate is 100°C...

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Abstract

The invention relates to a method of degrading glyphosate in a water body. The method comprises the following steps: adding honeycomb ceramic packing into a 30-70% by mass of oxalic acid solution, boiling, condensing and refluxing the solution, washing the cooled solution with deionized water till the pH is 4-10 and putting the solution in an oven to be dried; weighing Co(NO3)2.6H2O, Ce(NO3)2.6H2Oand Al(OH)3 in deionized water, stirring the mixture and dropwise adding an aluminum sol to be fully mixed to form a mixed solution; impregnating the honeycomb ceramic packing in the mixed solution for 1-3 hours and taking out the same, blowing a residual liquid in ducts by nitrogen, putting the filler into the oven to be dried, and impregnating and drying the filler repeatedly for 3-5 times; putting the filler into a muffle furnace to combust to prepare a Co3O4-CeO2 / CH catalyst, wherein the molar ratio of Co to Ce is (1-5): 1 and the loading amount is 0.3-0.7; and activating persulfate by the catalyst to degrade glyphosate in the water body, wherein the removal rate of glyphosate reaches 95-100%.

Description

technical field [0001] The invention relates to a technology for treating organic pollutants in water body. Specifically, it relates to a preparation method of a catalyst with a honeycomb ceramic filler (CH) as a carrier and loaded with a transition metal oxide. Cobalt tetroxide and ceria synergistically activate persulfate to generate sulfate radicals to degrade glyphosate in water. Background technique [0002] Glyphosate (Glyphosate) commonly known as: Roundup, chemical name: N-phosphonic acid methyl-glycine. Monsanto Chemical Company of the United States first screened and synthesized glyphosate in the 1960s. In the 1970s, my country began to conduct research on glyphosate. Glyphosate has a wide range of uses and can be used on crops and non-crops. Compared with chlorinated pesticides, glyphosate is less toxic, more effective and less costly. It has been registered for use all over the world. As of July 2012, there are about 130 registered glyphosate manufacturers in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72B01J23/83B01J37/02C02F101/30
CPCB01J23/83B01J37/0207B01J37/0213C02F1/725C02F2101/306
Inventor 丁辉郝利静薛花朱慧真
Owner TIANJIN UNIV
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