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Biochar prepared by co-pyrolysis of excess sludge and hazelnut shells and photocatalytic modification method of biochar

A technology for excess sludge and biochar, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Solve the problems of low sunlight utilization rate and achieve the effect of no secondary pollution, good adsorption performance and high reuse rate

Inactive Publication Date: 2021-02-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following disadvantages in the actual process: first, most semiconductors have a low utilization rate of sunlight; second, the photogenerated electron-hole pairs of semiconductors are easy to recombine, which reduces the photon quantum yield and affects the photocatalytic efficiency.

Method used

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  • Biochar prepared by co-pyrolysis of excess sludge and hazelnut shells and photocatalytic modification method of biochar
  • Biochar prepared by co-pyrolysis of excess sludge and hazelnut shells and photocatalytic modification method of biochar
  • Biochar prepared by co-pyrolysis of excess sludge and hazelnut shells and photocatalytic modification method of biochar

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Separately dry the remaining sludge and hazelnut shells at 100-105°C for 24 hours and then break them into solid particles below 1 mm: mix the remaining sludge and hazelnut shells according to the mass percentage of 30% of the hazelnut shells in the mixture, and pass through 4mol / L The potassium carbonate solution was soaked and activated at room temperature with a liquid-solid ratio of 2:1 for 24 hours, and then dried at 100-105°C; the dried mixed particles were vacuum-heated to 800°C at a rate of 10°C / min and kept for 1 hour; The pyrolyzed product is washed successively with dilute hydrochloric acid and deionized water, and dried at 100-105°C to obtain biochar with a yield of 52.5%. In terms of adsorption performance: the specific surface area is 768.33m 2 / g, iodine adsorption value: 673.26mg / g. figure 2 The appearance diagram of the biochar prepared in Example 1 of the present invention is provided. The solid particles are uniform and fine, shiny, good in appeara...

Embodiment 2-1

[0064] Separately dry the remaining sludge and hazelnut shells at 100-105°C for 24 hours and then break them into solid particles below 1 mm: mix the remaining sludge and hazelnut shells according to the mass percentage of 30% of the hazelnut shells in the mixture, and pass through 4mol / L The potassium carbonate solution was soaked and activated at room temperature with a liquid-solid ratio of 2:1 for 24 hours, and then dried at 100-105°C; the dried mixed particles were vacuum-heated to 800°C at a rate of 10°C / min and kept for 1 hour; The pyrolyzed product is washed successively with dilute hydrochloric acid and deionized water, and dried at 100-105°C to obtain biochar with a yield of 52.5%. Dissolve 4mmol of zinc chloride in 60ml of deionized water, add 20mmol of sodium hydroxide under constant stirring, after completely dissolving, mix according to the mass ratio of biochar and catalyst raw materials at 1:1, and prepare the solution Place in a glass bottle and prepare at a c...

Embodiment 2-2

[0066] Same as Example 2-1, the difference is that the mass ratio of biochar to catalyst raw material is 1:3, and the nano-ZnO composite biochar material is obtained. In terms of adsorption performance: the specific surface area is 613.13m 2 / g, iodine adsorption value: 532.52mg / g, photocatalytic methyl orange degradation rate is 87%.

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Abstract

The invention relates to biochar prepared by co-pyrolysis of excess sludge and hazelnut shells and a photocatalytic modification method of the biochar. The method comprises the following steps: dryingand crushing the excess sludge and hazelnut shells, proportionally mixing, adding a potassium carbonate solution, soaking, drying, carrying out vacuum pyrolysis, sequentially washing with diluted hydrochloric acid and deionized water, and drying to obtain the biochar. The method comprises the following steps: dissolving zinc chloride in deionized water, adding a corresponding amount of sodium hydroxide under a stirring condition, completely dissolving and adding biochar, placing the prepared solution in a glass bottle, standing at a constant temperature under a closed condition until the reaction is complete, and cooling to room temperature to obtain the nano ZnO composite biochar material. According to the method, the residual sludge and hazelnut shells containing a large amount of organic matters are mixed and pyrolyzed to prepare the biochar, and the activated pore-forming method of potassium carbonate solution soaking is combined, so that the pyrolysis process is easier to occur,compared with crop pyrolysis modes such as direct incineration, pyrolysis and addition of corn straw, the method is simple, and the biochar product which is high in yield, large in specific surface area and good in porosity and has photocatalytic performance is more favorably formed.

Description

Technical field: [0001] The invention belongs to the technical field of sludge treatment technology and photocatalysis, and in particular relates to co-pyrolysis of excess sludge and hazelnut shells to prepare biochar and a photocatalytic modification method thereof. Background technique: [0002] The remaining sludge of urban sewage treatment plants has the characteristics of high organic matter content and a large amount of carbon enrichment. Pyrolysis treatment at a certain temperature can make the sludge harmless and reduce the amount, and the remaining solid residue can effectively The carbon element in it is retained to form combustible gas, liquid tar and biochar products with high added value. At the same time, the trace heavy metal elements in the sludge are transformed into a special structural residue state during high-temperature pyrolysis, which is inert and cannot be absorbed and utilized by organisms, nor can it be accumulated in the human body through the foo...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J23/06B01J35/00B01J35/10B01J37/08C02F1/30C02F101/30
CPCB01J21/18B01J23/06B01J37/084C02F1/30C02F2101/308C02F2305/10B01J35/39B01J35/617
Inventor 陈熙张冉徐新阳赵冰李海波黄宇范广建
Owner NORTHEASTERN UNIV
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