Activated Carbon Basic Functional Groups Adsorption
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Solution Overview
Problem
Activated carbons have low hydrophilicity and adsorption capacity for water vapor and polar substances, limiting their application in adsorption processes such as adsorption heat pumps and water purification due to their hydrophobic nature and poor wettability with water.
Innovation Solution
Imparting basic functional groups to the surface of activated carbons, specifically through contact with a basic substance and subsequent heating under an inert atmosphere, increases hydrophilicity and water vapor adsorption capacity, with a preferred amount of basic functional groups exceeding 0.470 meq/g and a ratio of basic to acidic functional groups of 1.00 or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If activated carbon is used for adsorption applications, then adsorption capacity for non-polar substances is improved, but adsorption capacity for polar substances (water, water vapor) deteriorates due to hydrophobic nature
Solution Approach 1:
The patent changes the chemical parameter of the activated carbon surface by introducing basic functional groups (such as amino groups) through treatment with basic substances like ammonia or amine-containing compounds. This chemical modification transforms the surface from hydrophobic to hydrophilic, enabling effective adsorption of polar substances while maintaining non-polar substance adsorption capacity
Solution Approach 2:
The patent creates a composite surface structure on activated carbon by combining the carbon matrix with basic functional groups. This composite approach integrates the high surface area and pore structure of activated carbon with the hydrophilic properties of basic functional groups, achieving broad-spectrum adsorption capability
2Quantity of substance
If activated carbon is treated with oxidizing agents to enhance hydrophilicity, then water vapor adsorption amount increases, but the structure and properties of activated carbon may be damaged
Solution Approach 1:
Instead of using strong oxidizing agents that can damage the carbon structure, the patent employs basic substances (ammonia, amines) to introduce basic functional groups. This alternative chemical modification achieves hydrophilicity enhancement and water vapor adsorption improvement while preserving the structural integrity and porous framework of the activated carbon
Solution Approach 2:
The patent converts the typically problematic hydrophobicity of activated carbon into a beneficial feature by introducing basic functional groups that create hydrophilic sites. The basic functional groups act as beneficial modifiers that enhance water vapor adsorption without causing structural damage, effectively transforming a limitation into an advantage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The enhanced hydrophilicity and increased water vapor adsorption capacity improve the adsorption performance of activated carbons, making them suitable for moisture adsorption in air and various applications like deodorization and water purification, with improved wettability and dispersibility.
Implementation Method 1
Activated carbons are used in various applications for adsorption because of their increased specific surface areas and developed pore structures
Implementation Method 2
if basic functional groups are imparted to the surface of an activated carbon, the hydrophilicity of the activated carbon is improved and the water vapor adsorption amount of the activated carbon is also increased
Implementation Method 3
the activated carbon is treated with a basic substance in the production process of the activated carbon, basic functional groups contributing to improving of the hydrophilicity of the activated carbon can be imparted to the surface of the activated carbon
Data Source
AI summary
The present invention provides activated carbon with which hydrophilicity is excellent and the amount of steam adsorbed is increased, and provides a method for producing this activated carbon. This activated carbon is characterized in that the amount of basic functional groups in the activated carbon is 0.470 meq/m2 or greater. Preferably the amount of basic groups per specific surface area of activated carbon is 0.200 μeq/m2 or greater and the ratio of the amount of basic functional groups and the amount of acidic functional groups (basic functional groups/acidic functional groups) is 1.00 or greater. This method for producing activated carbon is characterized in comprising a step for imparting basic functional groups by bringing the activated carbon into contact with a basic substance. According to a preferred embodiment, the method comprises a step for heating the resulting activated carbon in an insert atmosphere.