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Modified walnut shell active carbon adsorbent and preparation method thereof

An activated carbon adsorption, walnut shell technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of large optimal adsorption dosage, unstable adsorption performance of adsorbents, harsh experimental conditions, etc. To achieve the effect of strong market competitiveness and promotion value, good ability to remove heavy metal ions, and easier control of process parameters

Inactive Publication Date: 2015-12-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The existing biomass adsorbents generally have the following disadvantages: adsorbents prepared from different biomass materials have different saturated adsorption capacities, and are limited by the pore structure and surface structure of the adsorbents, and the adsorption capacity cannot meet the processing requirements; some biomass The process of preparing activated carbon from materials is complex, expensive, difficult to regenerate, and cannot be put into production in batches; the adsorption performance of some adsorbents is unstable and the reproducibility is poor, and the performance of different batches of the same material from the same manufacturer often varies greatly
However, the effect of this adsorbent after modification does not change significantly, the required experimental conditions are relatively harsh, the optimal adsorption dosage is relatively large, and the requirements for suitable temperature and pH value are relatively high. High cost, not conducive to market promotion and application

Method used

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  • Modified walnut shell active carbon adsorbent and preparation method thereof
  • Modified walnut shell active carbon adsorbent and preparation method thereof
  • Modified walnut shell active carbon adsorbent and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0043] The walnut shell powder sieved through 150 mesh is dried for later use, then the concentrated phosphoric acid solution is diluted with water to form a phosphoric acid solution with a mass fraction of 25%, and then the dried pyrolusite powder is added to the walnut shell powder according to 0.1% of the total mass Mix evenly, and add 20mL of prepared phosphoric acid solution to immerse. After fully stirring, place it in an ultrasonic cleaner for 2 hours, take it out and place it in an oven for activation for 18 hours. The mixture was then fired at 450 °C for 1 h in a tube furnace. After cooling to room temperature, wash repeatedly with hot water until neutral, dry, grind and sieve.

example 2

[0045] The walnut shell powder sieved through 200 mesh is dried for later use, then the concentrated phosphoric acid solution is diluted with water to form a phosphoric acid solution with a mass fraction of 40%, and then the dried pyrolusite powder is added to the walnut shell powder according to 1.0% of the total mass Mix evenly, and add 40mL of prepared phosphoric acid solution to immerse. After fully stirring, place it in an ultrasonic cleaner for 2 hours, take it out and place it in an oven for activation for 24 hours. The mixture was then fired at 550 °C for 1 h in a tube furnace. After cooling to room temperature, wash repeatedly with hot water until neutral, dry, grind and sieve.

example 3

[0047] The walnut shell powder sieved through 300 meshes is dried for later use, then the concentrated phosphoric acid solution is diluted with water to form a phosphoric acid solution with a mass fraction of 30%, and then the dried pyrolusite powder is added to the walnut shell powder according to 2.0% of the total mass Mix evenly, and add 25mL of prepared phosphoric acid solution to immerse. After fully stirring, place it in an ultrasonic cleaner for 3 hours, take it out and place it in an oven for activation for 20 hours. The mixture was then fired at 480 °C for 2 h in a tube furnace. After cooling to room temperature, wash repeatedly with hot water until neutral, dry, grind and sieve.

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Abstract

The invention provides a modified walnut shell active carbon adsorbent and a preparation method thereof. The preparation method of the modified walnut shell active carbon adsorbent comprises the following steps: drying crushed and sieved walnut shell powder in a drying oven till constant weight is realized, weighing a proper amount of soft manganese ore powder, adding the soft manganese ore powder into the walnut shell powder, chemically activating the walnut shell powder by using H3PO4, soaking and activating the walnut shell powder in a phosphoric acid solution for 18-24 hours, then burning and carbonizing at high temperature, cooling the walnut shell powder to the room temperature, washing with water till to neutral, drying the walnut shell powder in the drying oven, grinding and sieving to prepare the modified walnut shell active carbon adsorbent. Compared with the ordinary walnut shell active carbon, the adsorbent is high in removal rate of heavy metal ions such as copper, lead and chromium; the adsorption capacity is high; the raw materials for preparing the adsorbent are wide in sources and low in cost; the adsorbent can be widely used in natural water and industrial sewage and wastewater for removing the heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of adsorbents used in sewage treatment and their preparation, and in particular relates to a modified walnut shell activated carbon adsorbent and a preparation method thereof. Background technique [0002] With the rapid development of industry and the unreasonable discharge of wastewater, the pollution of heavy metals in water bodies in my country is becoming more and more serious. Heavy metal pollution is highly toxic, difficult to metabolize in the environment, easy to bioaccumulate, and easy to enter the human body through the food chain, seriously endangering human health. The development of economical and effective technologies for the removal and recovery of heavy metal ions in wastewater has important practical significance for the protection of the ecological environment, human health and comprehensive utilization of resources. [0003] Heavy metal wastewater mainly comes from mining, smelting, ele...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 陈尧姚思聪刘纪龙唐述雄
Owner SICHUAN UNIV
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