CN-121466981-B - Modified coal activated carbon for sewage treatment and preparation method and application thereof

Abstract

The application relates to the technical field of wastewater treatment materials, in particular to modified coal activated carbon for wastewater treatment and a preparation method and application thereof. The adsorption material takes coal dust and CNC as matrixes, is prepared by soaking a composite nitrate solution and then mixing and sintering, and realizes the double functions of oxidation reaming and metal/amino. The adsorption material of the application has excellent adsorption efficiency (more than or equal to 90%) and long-term stability in the water quality with complex pollution of organic matters and heavy metals, and can effectively meet the application in the water quality with complex pollution.

Inventors

• LIU GEN
• WANG SHAOHUA
• SONG GUOQIANG
• ZHU YAGUANG
• XIN XIN

Assignees

• 大同市金盛豪达炭业有限责任公司

Dates

Publication Date

20260512

Application Date

20260109

Claims (4)

1. 1. The modified coal activated carbon for sewage treatment is characterized in that the modified coal activated carbon is prepared by mixing pulverized coal and CNC, dipping the pulverized coal in a compound nitrate solution, and sintering the mixture; The compound nitrate solution consists of the following components in percentage by weight: 15-18wt% of ferric nitrate, 7-9wt% of lanthanum nitrate, 5-7wt% of ammonium nitrate and the balance of water; the CNC is cellulose nanocrystalline; The weight ratio of the pulverized coal to the CNC to the compound nitrate solution is 1 (0.1-0.2) to 2-3; the preparation method comprises the following specific steps: S1, mixing and soaking pulverized coal, CNC and a compound nitrate solution according to the corresponding weight ratio, and stirring for 1-3 hours at the constant temperature of 60 ℃ to obtain a sintering precursor for standby after the pulverized coal, the CNC and the compound nitrate solution are uniformly mixed; S2, sintering the sintering precursor obtained in the step S1, wherein the specific process is as follows: 1) Dehydrating the coal precursor obtained in the step S1 for 1-2h at 100-120 ℃; 2) After the temperature is raised to 250-280 ℃, introducing nitrogen to continue sintering for 1-2h; 3) Heating to 300-350 ℃ to perform amino fixation treatment for 0.5-1h; 4) Heating to 600-620 ℃ for metal oxidation treatment for 0.5-1h.
2. 2. The modified coal activated carbon for sewage treatment according to claim 1, wherein the pulverized coal is anthracite coal, ash content is less than or equal to 5%, and particle size is 80-120 mesh.
3. 3. The modified coal activated carbon for sewage treatment according to claim 1, wherein the CNC has a diameter of 10 to 20 nm, a length of 200 to 500 nm, a crystallinity of >85%, and a surface charge of-35 mV to-50 mV.
4. 4. The application of the modified coal activated carbon for sewage treatment according to any one of claims 1 to 3 is characterized in that the modified coal activated carbon is suitable for industrial wastewater treatment of complex components and has better long-acting applicability and universality.

Description

Modified coal activated carbon for sewage treatment and preparation method and application thereof Technical Field The application relates to the technical field of sewage treatment materials, in particular to modified coal activated carbon for sewage treatment and a preparation method and application thereof. Background In response to the national green development policy, serious industries have begun to more strictly control sewage discharge and treatment in recent years, wherein organic matter pollution of water bodies is most common, and based on the pollution, various adsorption materials capable of effectively removing organic matters or derivatives thereof in water bodies are tested. The adsorption material used in the related technology is mainly natural materials with lower cost, specifically activated carbon, zeolite and fly ash, and mainly depends on Van der Waals force and pore interception, namely physical adsorption, to adsorb organic matters in water, so that the adaptability and the broad spectrum are strong. However, the adsorption material is more suitable for the primary treatment of water bodies, or a system (only organic matters) with relatively simple water quality components cannot meet the application (organic matters and heavy metals) in the composite polluted water quality, and the reproducibility and the stability are weak, so the modified coal activated carbon for sewage treatment and the preparation method thereof are particularly provided based on the defects of the existing adsorption material. Disclosure of Invention In order to solve the technical problems, the application provides the modified coal activated carbon for sewage treatment and the preparation method thereof, and the adsorption material has excellent adsorption efficiency (more than or equal to 90%) and long-term stability in the water quality with the combined pollution of organic matters and heavy metals. In a first aspect, the application provides a modified coal activated carbon for sewage treatment, which adopts the following technical scheme: The modified coal activated carbon for sewage treatment is prepared by mixing pulverized coal and CNC, dipping the pulverized coal in a compound nitrate solution, and sintering the immersed pulverized coal; the compound nitrate solution consists of ferric nitrate, lanthanum nitrate, ammonium nitrate and water. Preferably, the compound nitrate solution consists of the following components in percentage by weight: 15-18wt% of ferric nitrate, 7-9wt% of lanthanum nitrate, 5-7wt% of ammonium nitrate and the balance of water. Preferably, the dosage ratio of the pulverized coal, CNC and the compound nitrate solution is 1 (0.1-0.2): 2-3. Preferably, the pulverized coal is anthracite, ash content is less than or equal to 5%, and particle size is 80-120 meshes. Preferably, the CNC has a diameter of 10-20 nm, a length of 200-500 nm, a crystallinity of >85%, and a surface charge of-35 mV to-50 mV. Preferably, the sintering is stage-wise temperature-rising sintering under the condition of stage nitrogen. By adopting the technical scheme, the modified coal activated carbon takes coal dust and CNC as matrixes, is prepared by soaking the composite nitrate solution and then mixing and sintering, so that the oxidation reaming and metal/amino double-functionalization are realized, and the treatment of organic matters and heavy metals in complex water quality is realized based on the oxidation reaming and metal/amino double-functionalization. In a second aspect, the application provides a preparation method of modified coal activated carbon for sewage treatment, which adopts the following technical scheme: The preparation method of the modified coal activated carbon for sewage treatment comprises the following steps: S1, mixing and soaking pulverized coal, CNC and a compound nitrate solution according to the corresponding weight ratio, and stirring for 1-3 hours at the constant temperature of 60 ℃ to obtain a sintering precursor for standby after the pulverized coal, the CNC and the compound nitrate solution are uniformly mixed; S2, sintering the sintering precursor obtained in the step S1, wherein the specific process is as follows: 1) Dehydrating the coal precursor obtained in the step S1 for 1-2h at 100-120 ℃; 2) After the temperature is raised to 250-280 ℃, introducing nitrogen to continue sintering for 1-2h; 3) Heating to 300-350 ℃ to perform amino fixation treatment for 0.5-1h; 4) Heating to 600-620 ℃ for metal oxidation treatment for 0.5-1h. By adopting the technical scheme, the finished product of the modified coal activated carbon for sewage treatment prepared by the steps has stable and uniform performance, excellent pore structure and heavy metal adsorption effect, remarkably prolonged service life and the following principle possibly combined with corresponding data analysis: After the dehydration in the step 1), the obtained coal precursor is decomposed into ammonium nitrat