Method for preparing modified wood chip hydrothermal charcoal by adopting KOH

A biochar, wood chip technology, applied in water pollutants, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of limited adsorption performance and stability, limited adsorption sites, etc., and achieve far-reaching social significance and economical. Value, improved adsorption performance, mild conditions

Inactive Publication Date: 2014-10-01
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, hydrothermal biochar itself has limited surface adsorption sites, so its adsorption performance and stability are greatly limited.

Method used

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  • Method for preparing modified wood chip hydrothermal charcoal by adopting KOH
  • Method for preparing modified wood chip hydrothermal charcoal by adopting KOH
  • Method for preparing modified wood chip hydrothermal charcoal by adopting KOH

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Through the preparation method of KOH modified sawdust hydrothermal biochar, the steps are as follows:

[0027] 1) Sawdust (SD) is crushed into powder, and the particle size is to pass through a 50-mesh sieve;

[0028] 2) Add 5.0g of sawdust and 60mL of distilled water in turn into a 100mL reactor, and seal it;

[0029] 3) Place the reaction kettle in an oven, react at a constant temperature of 200°C for 20 hours, and then cool to room temperature;

[0030] 4) Take out the solid-phase product, wash it with distilled water until it is neutral, dry it at 105°C and store it in a sealed container to obtain sawdust hydrothermal biochar (H-SD);

[0031] 5) Mix 2.0 g of sawdust hydrothermal biochar with 2N KOH solution, stir well for 1 hour, filter, wash with water, and dry to obtain modified sawdust hydrothermal biochar (mH-SD).

[0032] like figure 1 As shown, before modification, the content of impurities on the surface of wood chip hydrothermal biochar is more, while KO...

Embodiment 2

[0038] Weigh 0.06g of modified sawdust hydrothermal biochar, add 30mL of 20mg / L cadmium solution (containing 0.01mol / L of NaNO 3 As a background solution), adjust the pH of the solution with 0.1mol / L NaOH and nitric acid, place the sample bottle in a shaker at 150r / min, shake at 30°C, take samples at different time periods, filter with a 0.22μm filter membrane, and use Atomic absorption spectrophotometer (AA240FS, VARIAN) was used to measure the concentration of Cd(II) in the filtrate. For the unmodified hydrothermal biochar, the same steps as above were taken for comparison.

[0039] image 3 It shows that before and after the modification of sawdust hydrothermal biochar, the adsorption equilibrium time is the same, but the removal rate of Cd(II) after modification is significantly improved, from 11% of H-SD to 95% of mH-SD, indicating that the modified water Thermal biochar has good removal ability for heavy metal cadmium.

Embodiment 3

[0041] Weigh 0.06 g of modified sawdust hydrothermal biochar, and add 30 mL of cadmium solutions with different concentrations (containing 0.01 mol / L NaNO 3 As a background solution), adjust the pH of the solution with 0.1mol / L NaOH and nitric acid, place the sample bottle in a shaker at 150r / min, shake at 30°C for 24h, take a sample, filter it with a 0.22μm filter membrane, and use atomic absorption spectrophotometry Meter (AA240FS, VARIAN) was used to measure the concentration of Cd(II) in the filtrate. For the unmodified hydrothermal biochar, the same steps as above were taken for comparison.

[0042] like Figure 4 As shown, the maximum adsorption capacity of sawdust hydrothermal biochar before and after modification was 14.25 and 41.25 mg / L, respectively, and the adsorption capacity of modified hydrothermal biochar to Cd(II) increased by nearly 3 times, indicating that the modified hydrothermal biochar It has good adsorption performance for heavy metal Cd(II).

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Abstract

A method for preparing modified wood chip hydrothermal charcoal by adopting KOH comprises the following steps: smashing wood chips into powder; taking proper amount of wood chip powder, mixing with distilled water, and conducting hydrothermal reaction in a reaction kettle so as to prepare the hydrothermal charcoal; mixing the obtained hydrothermal charcoal and a KOH solution, stirring for a period of time, and then conducting filtering, water washing and stoving so as to obtain the modified wood chip hydrothermal charcoal. The method is simple, and facilitates industrialized production; comparing the effect of the prepared modified hydrothermal charcoal with that of the conventional charcoal or a conventional similar charcoal adsorbent, the adsorptivity on heavy metal is greatly improved, and the stability is considerable.

Description

technical field [0001] The invention belongs to the fields of biochar adsorption material preparation and environmental pollution control, and in particular relates to a preparation method of KOH-modified sawdust hydrothermal biochar. Background technique [0002] Agricultural and forestry biomass wastes such as crops, rice husks, and sawdust come from a wide range of sources, accounting for 60% of the total biomass energy resources. The traditional incineration treatment method not only wastes resources, but also pollutes the environment. Therefore, it is urgent to develop clean and efficient agricultural and forestry waste. Waste resource utilization technology. In recent years, research on hydrothermal carbonization of biomass has been carried out at home and abroad, making the recycling of waste biomass and energy regeneration possible. So far, hydrothermal biochar has been widely used: as a soil conditioner to improve soil fertility and crop yield; as an inexpensive ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
Inventor 唐景春孙克静张海荣刘庆龙黄华
Owner NANKAI UNIV
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