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Heavy metal adsorbent and preparation method and application thereof

A heavy metal and adsorbent technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, special forms of dry distillation, etc., can solve problems such as limited treatment effect

Inactive Publication Date: 2016-11-09
SHENZHEN TECHAND ECOLOGY & ENVIRONMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption performance of biochar is closely related to its raw materials, preparation methods, and specific surface area. However, biochar prepared by commonly used raw materials and technologies has very limited effects on the treatment of heavy metals in water and soil.

Method used

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  • Heavy metal adsorbent and preparation method and application thereof
  • Heavy metal adsorbent and preparation method and application thereof
  • Heavy metal adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The discarded mustard collected from the vegetable market was air-dried naturally, and biochar was prepared by pyrolysis under the protection of nitrogen. The equipment used was a tubular muffle furnace. The pyrolysis temperature control program was as follows: 1. Increase the temperature from room temperature to 350°C, ② keep the temperature at 350°C for 30 minutes, ③ increase the temperature from 350°C to 650°C at a heating rate of 500°C / h, ④ keep the temperature at 650°C for 120 minutes, and ⑤ cool down naturally; use a ball mill to grind the fired biochar until the particle size is less than 1 micron, to obtain the heavy metal adsorbent I.

Embodiment 2

[0024] The discarded rapeseed will be collected and air-dried naturally, and the air-dried rapeseed will be pyrolyzed under the protection of nitrogen to prepare biochar. The equipment used is a tubular muffle furnace. The pyrolysis temperature control program is: 1. The temperature was raised from room temperature to 350°C, ②at 350°C for 30 minutes, ③at a heating rate of 500°C / h from 350°C to 650°C, ④at 650°C for 120 minutes, and ⑤naturally cooling down; If the diameter is less than 1 micron, the heavy metal adsorbent II is obtained.

Embodiment 3

[0026] The discarded cabbage will be collected and air-dried naturally, and the air-dried cabbage will be pyrolyzed under the protection of nitrogen to prepare biochar. The equipment used is a tubular muffle furnace. The pyrolysis temperature control program is: 1. Raise the temperature from room temperature to 400°C, ② keep the temperature at 400°C for 20 minutes, ③ raise the temperature from 400°C to 600°C at a heating rate of 300°C / h, ④ keep the temperature at 600°C for 180 minutes, and ⑤ cool down naturally; If the diameter is less than 1 micron, the heavy metal adsorbent III is obtained.

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Abstract

The invention discloses a heavy metal adsorbent and a preparation method and application thereof. The heavy metal adsorbent is biological charcoal obtained by air-drying and pyrolyzing cruciferous plants in a grinding mode, wherein the cruciferous plants comprise leaf mustards, radishes, oilseed rape, Chinese cabbages, cabbages, shepherd's purse, wild cabbages and the like. Through tests, it is found that the cruciferous plants contain more sulfhydryl compounds, and the biological charcoal with a sulfydryl group can be obtained after the sulfhydryl compounds are pyrolyzed, can generate adsorbing and chelating effects with heavy metal ions and has the high affinity with positive ions of heavy metals such as Cd, Cu, Mn, Ni and Zn; the waste cruciferous plant bodies such as the Chinese cabbages and the leaf mustards are collected to be air-dried and pyrolyzed to prepare the biological charcoal, therefore, the discharge amount of garbage can be decreased, reutilization of waste resources is achieved, the high heavy metal adsorption capacity is achieved, and wide application prospects in heavy metal-containing water body treatment, heavy metal-contaminated soil remediation and permeable reactive barrier packing are achieved.

Description

technical field [0001] The invention relates to the technical field of heavy metal pollution control, in particular to a heavy metal adsorbent, its preparation method and application. Background technique [0002] Biochar refers to the high-temperature treatment of biomass under anoxic conditions. The oil and gas in the biomass are burned or collected after separation, and the remaining solid matter is mainly biochar. Preparation of waste biomass resources into biochar by carbonization technology for development and utilization can solve complex problems such as sustainable development and environmental protection to a large extent, and is of great significance for ensuring national environmental security and sustainable use of resources. Biochar is an insoluble and stable black solid substance with dense microporous structure and huge specific surface area, which can effectively adsorb and stabilize inorganic ions and organic compounds, and can be used in soil improvement, ...

Claims

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Application Information

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IPC IPC(8): C02F1/28C10B53/02C10B57/02C01B31/02B09C1/00C02F101/20
CPCB01J2220/485B09C1/00C02F1/283C10B53/02C10B57/02Y02E50/10
Inventor 黄雷张时伟李红艳任重赵亮周巍许建新
Owner SHENZHEN TECHAND ECOLOGY & ENVIRONMENT CO LTD
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