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A kind of koh-modified southeast sedum hydrothermal carbon preparation method and its application

A hydrothermal carbon, modification technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., to achieve the effects of low leaching toxicity, improved efficiency, and stable metal form

Active Publication Date: 2022-07-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of this, the present invention provides a method for effectively reducing the toxicity of waste biomass and preparing modified biochar to solve the problem of disposal and rational reuse of waste biomass of heavy metal hyperaccumulation plants

Method used

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  • A kind of koh-modified southeast sedum hydrothermal carbon preparation method and its application
  • A kind of koh-modified southeast sedum hydrothermal carbon preparation method and its application
  • A kind of koh-modified southeast sedum hydrothermal carbon preparation method and its application

Examples

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Effect test

Embodiment 1

[0052] A method for preparing KOH-modified Southeast Sedum hydrothermal charcoal. The first step is to prepare hydrothermal charcoal with low toxicity. After cleaning the biomass material, the biomass material is dried to constant quality, and the dried biomass is dried. The material is pulverized into powder, mixed with deionized water in a tetrafluoroethylene reactor, put into a muffle furnace, heated at a preset temperature, cooled to room temperature, taken out, ground and sieved to obtain hydrothermal charcoal. The method specifically includes the following steps:

[0053] The plant collected from the lead-zinc mining area was washed with water to remove some dirt and other impurities on it, the roots were cut off, the water on the surface of the plant was dried, and then slightly cut with scissors, and dried in an oven at 60°C To constant weight, then use a plant grinder to pulverize into powder, pulverize the particle size to 1-2mm, seal it and store it in a desiccator ...

Embodiment 2

[0103] The difference between this embodiment and the first embodiment is that a KOH-SAB material adsorbs Cd-containing 2+ Application in wastewater, during adsorption, the wastewater is treated to make its pH concentration 6; before wastewater treatment, the Cd in wastewater is treated 2+ The ion concentration was detected according to Cd 2+ The ion concentration to determine the amount of the material added, the amount of the material added per liter of wastewater and the amount of Cd per liter of wastewater 2+ The ratio of the content of ions is 40:1.

Embodiment 3

[0105] The difference between this embodiment and the first embodiment is that a KOH-SAB material adsorbs Cd-containing 2+ Application in wastewater, during adsorption, the wastewater is treated to make its pH concentration 5; before wastewater treatment, the Cd in wastewater is treated 2+ The ion concentration was detected according to Cd 2+ The ion concentration to determine the amount of the material added, the amount of the material added per liter of wastewater and the amount of Cd per liter of wastewater 2+ The ratio of the content of ions is 45:1.

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Abstract

The invention discloses a preparation method of KOH-modified Sedum sedum hydrothermal charcoal and application thereof. A microsphere structure is formed on the surface, and a solid product with clear physical and chemical properties is formed by dehydration and decarboxylation. Then, alkali activation is used to change the properties of the hydrothermal carbon, increase the specific surface area, and enrich the functional groups on its surface. After washing and drying, a material with rich functional groups is obtained. Compared with the prior art, the content and concentration of heavy metals in the hydrothermal carbon obtained by the present invention are lower than the critical content in hazardous waste, the specific surface area is three times that of the raw material, and the surface oxygen-containing functional groups are rich, and under certain conditions, Cd 2+ The removal rate is high, which improves the efficiency of the adsorption method to purify water pollution. The isoelectric point is pH 5.1, and the electronegativity is strong. It is an economical and feasible disposal method for hyperaccumulators, and realizes resource reuse while reducing toxicity.

Description

technical field [0001] The invention belongs to the technical field of environmental protection treatment, and relates to a preparation method and application of KOH-modified Sedum sedum hydrothermal carbon. Background technique [0002] As we all know, due to the rapid development of metal electroplating facilities, mining industry, fertilizer industry, paper industry and pesticide industry, more and more heavy metal-containing wastewater is discharged into the environment, and the polluted water body affects agricultural planting, aquatic animals and plants. Reproduction will also accumulate through the food chain, threatening human health, leading to various diseases and poisoning. Cadmium is irritating to the respiratory tract and prolonged exposure can cause hypoxia. [0003] Various methods have been developed to remove heavy metals from wastewater, including chemical precipitation, coagulation and flocculation, membrane filtration, ion exchange, electrochemical treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C01B32/324C01B32/354C02F1/28C02F101/20
CPCB01J20/20B01J20/041C01B32/324C01B32/354C02F1/283C02F1/288C02F2101/20C01P2004/03C01P2002/72C01P2002/80C01P2002/82B01J2220/485B01J2220/4875
Inventor 姜理英汤露姚志伟李珂
Owner ZHEJIANG UNIV OF TECH
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