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Preparation method of CO2-adsorbing shrimp-shell-base nitrogenous activated carbon

A technology of activated carbon and shrimp shells, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as strong corrosion and complex process, and achieve the effect of low price, wide source, and excellent adsorption performance of recycling regeneration

Inactive Publication Date: 2017-05-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method uses a large number of expensive and toxic organic substances as precursors. The KOH activator used is moderately toxic and highly corrosive, and it is first carbonized and then mixed with KOH for activation. The process is complicated. The concept of harmless raw materials does not match

Method used

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  • Preparation method of CO2-adsorbing shrimp-shell-base nitrogenous activated carbon
  • Preparation method of CO2-adsorbing shrimp-shell-base nitrogenous activated carbon
  • Preparation method of CO2-adsorbing shrimp-shell-base nitrogenous activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, wash and dry the discarded shrimp shells at 110°C for 12 hours into powder to 100-140 mesh, then soak in excess 1mol / L hydrochloric acid for 12 hours, filter, wash with distilled water until neutral, and dry at 110°C for 12 hours to obtain shrimp Shell powder; then 2g shrimp shell powder, 2g potassium oxalate (the mass ratio of potassium oxalate and shrimp shell powder is 1:1) is mixed homogeneously in grinder, obtains mixture; Then mixture is placed in N 2 Carbonized material was obtained by carbonizing at 650°C for 2h (heating rate: 5°C / min) under the atmosphere (50ml / min); finally, the carbonized material was repeatedly washed with 1mol / L hydrochloric acid and distilled water until neutral, and dried at 110°C for 12h to obtain activated carbon. CO at normal temperature and pressure 2 The adsorption capacity is 3.64mmol / g (see figure 1 Middle curve A1), the nitrogen element content is 4.99wt%.

Embodiment 2

[0032] Example 2: Firstly, the discarded shrimp shells washed and dried at 110°C for 12 hours were powdered to 100-140 mesh, then soaked in excess 1mol / L hydrochloric acid for 12 hours, filtered, washed with distilled water until neutral, and dried at 110°C Obtain shrimp shell powder after 12h; Then mix 2g shrimp shell powder, 6g potassium oxalate (the mass ratio of potassium oxalate and shrimp shell powder is 3:1) in grinder, obtain mixture; Next mixture is placed in N 2 Carbonized material was obtained by carbonizing at 650°C for 2h (heating rate: 5°C / min) under the atmosphere (50ml / min); finally, the carbonized material was repeatedly washed with 1mol / L hydrochloric acid and distilled water until neutral, and dried at 110°C for 12h to obtain activated carbon. CO at normal temperature and pressure 2 The adsorption capacity is 4.09mmol / g (see figure 1 In curve A2), the nitrogen element content is 6.38wt%.

Embodiment 3

[0033] Example 3: Firstly, the discarded shrimp shells washed and dried at 110°C for 12 hours were powdered to 100-140 mesh, then soaked in excess 1mol / L hydrochloric acid for 12 hours, filtered, washed with distilled water until neutral, and dried at 110°C Obtain shrimp shell powder after 12h; Then 2g shrimp shell powder, 10g potassium oxalate (the mass ratio of potassium oxalate and shrimp shell powder is 5:1) are mixed in grinder, obtain mixture; Next mixture is placed in N 2Carbonized material was obtained by carbonizing at 650°C for 2h (heating rate: 5°C / min) under the atmosphere (50ml / min); finally, the carbonized material was repeatedly washed with 1mol / L hydrochloric acid and distilled water until neutral, and dried at 110°C for 12h to obtain activated carbon. CO at room temperature and pressure 2 The adsorption capacity is 3.91mmol / g (see figure 1 Middle curve A3), the nitrogen element content is 6.45wt%.

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Abstract

The invention discloses a preparation method of CO2-adsorbing shrimp-shell-base nitrogenous activated carbon. The method comprises the following steps: (1) pulverizing cleaned and dried waste shrimp shells into 100-140 meshes, soaking in excessive 1 mol / L hydrochloric acid for 12 hours, filtering the soaked product, washing with distilled water to a neutral state, and drying to obtain the shrimp shell powder; (2) uniformly mixing the shrimp shell powder and potassium oxalate in a grinder in a certain mass ratio to obtain a mixture; (3) carbonizing the mixture in an N2 atmosphere to obtain a carbonized material; and (4) repeatedly washing the carbonized material with 1 mol / L hydrochloric acid and distilled water to a neutral state, and drying to obtain the shrimp-shell-base nitrogenous activated carbon. Carbonization and activation are completed within one step to substitute the traditional post-activation process; the required raw materials are environmentally friendly and renewable, and the preparation technique is simple; the method can implement in-situ nitrogen doping; and the prepared nitrogen-doped activated carbon has excellent adsorbability and stable cyclic regeneration adsorbability for CO2 under the conditions of room temperature and atmospheric pressure.

Description

technical field [0001] The invention relates to a preparation method of nitrogen-containing activated carbon, in particular to a method for efficiently adsorbing CO 2 Preparation method of shrimp shell-based nitrogen-containing activated carbon. Background technique [0002] Since the industrial revolution, especially since 1950, the combustion of fossil raw materials has brought CO 2 A large amount of greenhouse gas emissions, mainly caused by a large number of droughts, floods, rising sea levels, and many unpredictable disasters. Therefore, the implementation of CO 2 The capture and enrichment has important theoretical and practical significance. Currently, capturing CO 2 The main methods are liquid phase absorption method, solid state adsorption method and membrane separation method. Among them, the liquid phase absorption method is highly corrosive to equipment, the energy consumption of absorbent regeneration is large, and it is easy to be oxidized and degraded; th...

Claims

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Application Information

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IPC IPC(8): C01B32/342
CPCC01P2002/08C01P2002/72C01P2004/03C01P2006/12C01P2006/14C01P2006/80
Inventor 蔡卫权张守特
Owner WUHAN UNIV OF TECH
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