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Agricultural straw biochar loaded nano Co3O4 composite catalyst and preparation method thereof

A composite catalyst, straw biotechnology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of low catalytic efficiency, secondary pollution, unstable environment and other problems, to achieve the effect of large specific surface area, reducing leaching and inhibiting agglomeration

Pending Publication Date: 2020-12-25
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses agricultural straw biochar as a carrier to load Co 3 o 4 Activated persulfate oxidative degradation of organic pollutants can effectively solve the single metal oxide Co 3 o 4 Low catalytic efficiency and instability can easily cause secondary environmental pollution

Method used

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  • Agricultural straw biochar loaded nano Co3O4 composite catalyst and preparation method thereof
  • Agricultural straw biochar loaded nano Co3O4 composite catalyst and preparation method thereof
  • Agricultural straw biochar loaded nano Co3O4 composite catalyst and preparation method thereof

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preparation example Construction

[0029] One aspect of the present invention provides an agricultural straw biochar loaded nano Co 3 o 4 The preparation method of composite catalyst, the method comprises the steps:

[0030] S1: cleaning, drying, crushing and sieving agricultural straw to obtain straw powder, calcining and cooling the straw powder to obtain primary biochar powder;

[0031] S2: Grinding the primary biochar powder and mixing with KOH aqueous solution, stirring and drying to obtain a mixture of primary biochar and KOH; calcining, cooling, washing, and vacuum drying the mixture of primary biochar and KOH , to obtain a high surface area activated biochar with a porous structure;

[0032] S3: Mix the high surface area activated biochar with a porous structure and ethanol to obtain a suspension, and mix the suspension with CoCl 2 ·6H 2 O and NH 4 HCO 3 mixing and stirring, washing and drying to obtain a biochar composite catalyst precursor;

[0033] S4: Grinding, calcining, and cooling the bioc...

Embodiment 1

[0062] This embodiment provides an agricultural straw biochar loaded nano Co 3 o 4 The preparation method of composite catalyst, the method comprises the steps:

[0063] S1: Rinse the rape stalks with tap water, remove the dust on the surface of the rape stalks, dry them in a blast drying oven at 120°C, crush them with a grinder, and sieve them to obtain straw powder with a particle size of less than 200 mesh. 6 g of the straw powder was loaded into a square porcelain boat, then placed in a tube furnace, and calcined at 700° C. for 2 hours under an argon atmosphere, with a heating rate of 5° C. / min. After the tube furnace was naturally cooled to room temperature, the product was taken out to obtain black primary biochar powder.

[0064] S2: After grinding 0.5 g of the black primary biochar powder obtained in step S1, add it to an aqueous solution of KOH, and ultrasonically disperse it for 1 hour to obtain a uniformly dispersed aqueous solution of primary biochar and KOH, and...

Embodiment 2-4

[0068] Embodiments 2-4 respectively provide a kind of agricultural straw biochar loaded nano Co 3 o 4 The preparation method of composite catalyst, the step of described method is identical with embodiment 1, and difference is, changed CoCl in the step S3 of embodiment 2-4 2 ·6H 2 O and NH 4 HCO 3 added amount. The CoCl of said embodiment 1-4 2 ·6H 2 O and NH 4 HCO 3 The addition amount, and the agricultural stalk biochar loaded nanometer Co that embodiment 1-4 obtains 3 o 4 Co in the composite catalyst 3 o 4 The theoretical mass ratios to rapeseed biochar are listed in Table 1.

[0069] Table 1

[0070] CoCl 2 ·6H 2 o

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Abstract

The invention belongs to the field of preparation of organic pollutant catalytic degradation materials, and discloses an agricultural straw charcoal loaded nano Co3O4 composite catalyst and a preparation method thereof. The method comprises the following steps: cleaning, drying, crushing and sieving agricultural straws to obtain straw powder, calcining and cooling the straw powder to obtain primary biochar powder, mixing the primary biochar powder with a KOH aqueous solution, stirring and drying the mixture to obtain a mixture of primary biochar and KOH, and calcining, cooling, washing and vacuum-drying the mixture to obtain the biomass charcoal. The preparation method comprises the following steps: preparing activated charcoal with a porous structure and a high surface area, mixing the activated charcoal with ethanol to obtain a suspension, mixing the suspension with CoCl2. 6H2O and NH4HCO3, stirring, washing and drying to obtain a charcoal composite catalyst precursor, and grinding,calcining and cooling the charcoal composite catalyst precursor to obtain the agricultural straw charcoal loaded nano Co3O4 composite catalyst. The method can solve the problem that a single metal oxide Co3O4 is low in catalytic efficiency and unstable and easily causes secondary pollution to the environment.

Description

technical field [0001] The invention belongs to the field of preparation of materials for catalytic degradation of organic pollutants, more specifically, relates to a kind of agricultural straw biochar loaded nano Co 3 o 4 Composite catalyst and preparation method. Background technique [0002] At present, antibiotics are widely used in the treatment and prevention of human and animal diseases, but because they cannot be completely absorbed in human and animal bodies, they are partially excreted from the body and enter the water environment. Various types of antibiotics have been detected in surface water and groundwater, indicating that antibiotics have caused adverse effects on the water environment, thereby endangering human health. Therefore, how to effectively remove antibiotics in the water environment has become an urgent environmental pollution problem to be solved. [0003] Advanced oxidation technology is a technology that generates strong oxidizing active subst...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/10C02F1/72C02F101/38
CPCB01J23/75C02F1/725C02F2101/38B01J35/61
Inventor 柴波闫俊涛范国枝王春蕾程群鹏宋光森
Owner WUHAN POLYTECHNIC UNIVERSITY
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