The invention also discloses application of calcium-manganese oxide catalyst in degradation of organic pollutants in wastewater and soil

A technology for organic pollutants and catalysts, which is applied in the field of catalysis and organic pollutant treatment to achieve good degradation and mineralization effects, low metal dissolution, and easy storage and transportation.

Pending Publication Date: 2020-11-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current research focuses on the activation of PMS by Co-based (B-site) perovskite oxides or rare earth metals La, Sr-based (A-site) perovskite oxides, and there are few perovskite oxides activated by PDS. Research

Method used

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  • The invention also discloses application of calcium-manganese oxide catalyst in degradation of organic pollutants in wastewater and soil
  • The invention also discloses application of calcium-manganese oxide catalyst in degradation of organic pollutants in wastewater and soil
  • The invention also discloses application of calcium-manganese oxide catalyst in degradation of organic pollutants in wastewater and soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A catalyst Ca x Mn y O z Preparation of:

[0037] Calcium nitrate tetrahydrate and manganese nitrate in different stoichiometric ratios were added to 10 mL of deionized water, and the total molar amount of metal Ca and Mn was 4 mmol to synthesize Mn.2 O 3 , CaMn 2 O 4 , CaMnO 3 and Ca 2 MnO 4 The ratios of the added calcium nitrate tetrahydrate and manganese nitrate are 0:1, 1:2, 1:1 and 2:1 respectively, add 8 mmol of citric acid and 2 mL of ethylene glycol, and stir and dissolve at room temperature until uniform. The solution was then placed in an oven at 80 °C for 24 hours to obtain a homogeneous colloid; the obtained colloid was transferred to a crucible, and placed in a muffle furnace for calcination with a set program: the temperature was raised to 900 at a temperature of 5 °C / min. ℃ and maintained for 3 hours, and finally lowered to room temperature at a cooling rate of 5 ℃ / min; the calcined powder was collected and ground to obtain the corresponding cata...

Embodiment 2

[0040] A catalyst Ca x Mn y O z Preparation of:

[0041] Calcium nitrate tetrahydrate and manganese nitrate were added to 10 mL of deionized water, and the total molar amount of metal Ca and Mn was 4 mmol to synthesize CaMnO 3 The ratio of calcium nitrate tetrahydrate and manganese nitrate added was 1:1, 4 mmol of citric acid and 10 mL of ethylene glycol were added, stirred and dissolved at room temperature to obtain a uniform solution, and then placed in an oven at 60 ° C for 48 hours to obtain Homogeneous colloid; transfer the obtained colloid into a crucible, put it into a muffle furnace and calcine with a set program: raise the temperature at 2°C / min to 800°C and keep it for 6h, and finally cool at 2°C / min The rate is reduced to room temperature; the calcined powder is collected and ground to obtain the corresponding catalyst.

[0042] From the diffraction pattern ( figure 2 ), it can be seen that the pure phase CaMnO without impurities was successfully synthesized. ...

Embodiment 3

[0044] A catalyst Ca x Mn y O z Preparation of:

[0045] Calcium nitrate tetrahydrate and manganese nitrate were added to 10 mL of deionized water, and the total molar amount of metal Ca and Mn was 4 mmol to synthesize CaMnO 3 The ratio of calcium nitrate tetrahydrate and manganese nitrate added was 1:1, 4 mmol of acetic acid and 8 mL of ethylene glycol were added, stirred and dissolved at room temperature to obtain a uniform solution, and then placed in an oven at 100 ° C for 6 hours to obtain a uniform solution. Transfer the obtained colloid into the crucible, put it into the muffle furnace and calcine with the set program: raise the temperature at 10°C / min to 1200°C and keep it for 2h, and finally at the cooling rate of 10°C / min Reduce to room temperature; collect and grind the calcined powder to obtain the corresponding catalyst.

[0046] From the diffraction pattern ( figure 2 ), it can be seen that the pure phase CaMnO without impurities was successfully synthesize...

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Abstract

The invention provides an application of a calcium-manganese oxide catalyst in degradation of organic pollutants in wastewater and soil, and relates to the technical field of catalysis and environmental organic pollutant control. The calcium-manganese oxide (Cax(Mn1-aFea)yOz) catalyst is prepared by a sol-gel method and high-temperature calcination, and is used for activating persulfate to generate active substances with strong oxidizing property, such as sulfate free radicals, hydroxyl free radicals, singlet oxygen and the like, so that organic pollutants in water and soil are rapidly oxidized and removed. The catalyst disclosed by the invention is simple to prepare and environment-friendly, the contained elements are Ca and Mn elements which are low in toxicity, cheap and rich in the earth, the metal dissolution rate in the reaction process is low, and the problem of secondary pollution is avoided. In addition, the reaction system formed by the catalyst and persulfate can rapidly degrade phenol, bisphenol A, 2,6-dichlorophenol, parachlorophenol, paracetamol and other refractory organic pollutants, shows good performance in a wide pH range, and has great application potential.

Description

technical field [0001] The invention relates to the technical field of catalysis and organic pollutant treatment, relates to the application of a calcium-manganese oxide catalyst in degrading organic pollutants in wastewater and soil, and in particular relates to a calcium-manganese oxide (Ca x (Mn 1-a Fe a ) y O z ) application of catalysts to activate persulfate to generate free radicals and reactive oxygen species for the degradation of organic pollutants in wastewater or soil. Background technique [0002] With the rapid development of industry and agriculture, the discharge of industrial wastewater has brought great pollution to the water body, and the biotoxic organic pollutants that are difficult to degrade naturally have brought serious damage to the ecosystem, restricting the sustainable development of humans and nature. develop. At present, the treatment methods of industrial wastewater are mainly divided into three categories: physical method, biological meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B09C1/08C02F1/72C02F101/30
CPCB01J23/8892B01J23/002C02F1/725B09C1/08B01J2523/00C02F2101/30B01J2523/23B01J2523/72B01J2523/842
Inventor 赵一新钱旭芳王甜陈晓彤
Owner SHANGHAI JIAO TONG UNIV
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