Method for preparing modified wheat straw hydrothermal charcoal by adopting KOH

A technology of wheat straw and biochar, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of limited adsorption sites, adsorption performance and stability limitations, etc., and achieve improved adsorption performance , far-reaching social significance and economic value, the effect of moderate conditions

Inactive Publication Date: 2014-10-01
NANKAI UNIV
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  • Abstract
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  • 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 wheat straw hydrothermal charcoal by adopting KOH
  • Method for preparing modified wheat straw hydrothermal charcoal by adopting KOH
  • Method for preparing modified wheat straw hydrothermal charcoal by adopting KOH

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of hydrothermal biochar modified by KOH wheat straw, the steps are as follows:

[0027] 1) crushing wheat straw (WS) into straw powder, the particle size of which is passed through a 50-mesh sieve;

[0028] 2) Add 5.0g of wheat straw powder 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 neutral, dry it at 105°C and store it in a sealed container to obtain wheat straw hydrothermal biochar (H-WS);

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

[0032] like figure 1 As shown, the impurity content on the surface of wheat straw hydrothermal biochar was obvious b...

Embodiment 2

[0038] Weigh 0.06 g of modified wheat straw hydrothermal biochar, add 30 mL of 20 mg / L cadmium solution (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, 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 wheat straw hydrothermal biochar, the adsorption equilibrium time is the same, but the removal rate of Cd(II) after modification is significantly improved, from 10% of H-WS to 98% of mH-WS, indicating that the modification Hydrothermal biochar has good removal ability for heavy metal cadmium.

Embodiment 3

[0041] Weighed 0.06 g of modified wheat straw hydrothermal biochar, and added 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 hydrothermal biochar before and after modification was 14.05 and 39.15 mg / L, respectively, and the adsorption capacity of modified hydrothermal biochar on Cd(II) increased by nearly 3 times, indicating that the modified hydrothermal biochar had a significant effect on Heavy metal Cd(II) has good adsorption p...

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Abstract

A method for preparing modified wheat straw hydrothermal charcoal by adopting KOH comprises the following steps: smashing the wheat straw into powder; taking proper amount of wheat straw powder, mixing with a distilled water, and conducting hydrothermal reaction in a reaction kettle so as to prepare the wheat straw 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 wheat straw 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 preparation of biochar adsorption materials and environmental pollution control, and in particular relates to a preparation method of hydrothermal biochar using KOH modified wheat straw. Background technique [0002] Agricultural and forestry biomass wastes such as crop stalks, rice husks, and wood chips have a large amount 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 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 i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 唐景春孙克静张海荣刘庆龙黄华
Owner NANKAI UNIV
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