Preparation and application of high-activation charcoal based on heat and cobalt complex modification

A biochar and complex technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, water pollutants, etc., can solve the kinetics of difficult to achieve activation and degradation of organic pollutants Increase and other problems, to achieve the effect of low price, simple preparation method and wide source

Pending Publication Date: 2021-09-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After activation, the surface of the material will generally be passivated. If the passivation layer cannot be removed, it will be difficult to achieve further activation, and the active sites for activation of persulfate on a single crystal plane are limited, which further restricts the removal of organic pollutants. Increased kinetics of degradation

Method used

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  • Preparation and application of high-activation charcoal based on heat and cobalt complex modification
  • Preparation and application of high-activation charcoal based on heat and cobalt complex modification
  • Preparation and application of high-activation charcoal based on heat and cobalt complex modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of a highly activated biochar based on heat and cobalt complex modification of the present embodiment comprises the following steps:

[0031] (1) Using straws of rice, wheat and other crops as raw materials, crush and sieve, calcinate at 900 °C for 2 hours in an atmosphere of carbon dioxide, wash and dry with hydrochloric acid to obtain biochar;

[0032] (2) Cobalt acetate (0.1 mM, 0.25 mM, 0.5 mM, 1.0 mM, 1.5 mM, 2.0 mM and 2.5 mM) and 1,10-phenanthroline (0.3 mM, 0.75 mM, 1.5 mM, 3.0 mM, 4.5 mM, 6.0 mM and 7.5 mM), after ultrasonic dispersion, calcined biochar was added, evaporated and stirred in a water bath for 4 hours, and the obtained complex was dried in an oven;

[0033] (3) Grind the dried composite into powder, calcinate at 600 °C for 2 hours in an argon atmosphere, take it out after room temperature, and seal it with an inert gas for storage;

[0034] Further, the biochar precursor used in the step (1) is a kind of straw of crops such as rice...

Embodiment 2

[0038] This example is used to illustrate the morphological characterization of thermally and cobalt complex modified biochar.

[0039] Such as figure 2 Shown are scanning electron microscope images of biochars with different loadings of cobalt complexes after calcination, (a-b) are biochar precursors, (c-d) are 0.1 mM cobalt acetate loading, (e-f) are 0.25 mM cobalt acetate loading (g-h) is 0.5 mM cobalt acetate loading, (i-g) is 1.0 mM cobalt acetate loading, (k-l) is 1.5 mM cobalt acetate loading, (m-n) is 2.0 mM cobalt acetate loading, (o-p) is 2.5 mM cobalt acetate loading. After being modified and calcined by the cobalt complex, the biochar no longer has the original structure. Since the cobalt complex melts under heating conditions, the surface of the biochar is covered, and the metal elements are loaded on the surface of the biochar. And with the increase of load, it is more difficult to see the original result of biochar and the degree of agglomeration is more obvi...

Embodiment 3

[0041] This example serves to illustrate the structural characterization of thermally and cobalt complex modified biochar.

[0042] Such as image 3 As shown in -a, it is shown by X-ray diffraction that no characteristic peaks appear after the introduction of cobalt complexes, and the graphite phase results and the existence of some silica impurities are maintained, further indicating that cobalt can reach atomic-level distribution on the surface of biomass , no corresponding characteristic peaks appear.

[0043] image 3 The Raman results in -b show that with the increase of the amount of cobalt loaded on the biochar, the degree of graphitization (ID / IG) first increases and then decreases, and the graphitization degree of 0.5 mM cobalt acetate is the largest .

[0044] Such as image 3As shown in -c and d, the binding energy of the 2p 3 / 2 peak of cobalt in the biochar with different loads of cobalt complexes showed a trend of decreasing first and then increasing, and the ...

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Abstract

The invention relates to preparation and application of high-activation charcoal based on heat and cobalt complex modification, and belongs to the technical field of environmental materials. The material is prepared by the following steps: calcining biomass sieved by a 160-mesh sieve in a carbon dioxide atmosphere, washing with hydrochloric acid, and drying; ultrasonically complexing cobalt acetate and 1,10-phenanthroline in an ethanol solvent, adding charcoal, stirring and evaporating to obtain a compound, and drying the compound in a drying oven; grinding the dried solid into powder, calcining for 2 hours at the temperature of 600 DEG C in an argon atmosphere, and introducing inert gas for storage, so as to obtain the heat and cobalt complex modified high-activation charcoal. The material activates peroxymonosulfate at a low dosage, so that the antibiotic sulfamethoxazole can be completely degraded in a short time, and the material shows high activation in a wide pH range, different salt concentrations and water bodies. The preparation method of the novel material is simple, the raw materials are cheap and easy to obtain, and the novel material is suitable for industrial preparation, has high activation on peroxymonosulfate, and has a wide application prospect in actual organic wastewater treatment.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and relates to the preparation and application of highly activated biochar based on heat and cobalt complex modification. Background technique [0002] Due to the abuse of antibiotics, related resistance genes and resistant microorganisms are constantly produced in the environment, which has caused serious damage to human health and ecosystems. Therefore, how to achieve the degradation of antibiotics in the environment has received extensive attention. As a sulfonamide drug, sulfamethoxazole is widely used in human body, poultry and marine aquaculture because of its broad-spectrum antibacterial efficacy and simple and easy preparation. After ingestion into the human body, most of the metabolites and about 15% to 25% of the precursors cannot be completely absorbed and released into the environment. The presence of yellow amines can be detected in surface water, wastewater and eve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C02F1/72C02F101/34C02F101/38
CPCB01J23/75C02F1/722C02F1/725C02F2101/40C02F2101/38C02F2101/34
Inventor 朱建裕顾春尧甘敏陈耀宗
Owner CENT SOUTH UNIV
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