Activated Carbon Fabrication Using Persulfate Catalysts
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Solution Overview
Problem
Current methods for converting low-grade carbon black waste into high-value activated carbon are energy intensive and require harsh chemicals, making them unsuitable for large-scale manufacturing and environmentally friendly production.
Innovation Solution
A method combining chemical and physical activation using ammonium persulfate or sodium persulfate as catalysts at moderate temperatures (350-500°C) to produce activated carbon with high surface area and adsorption capacity, reducing energy consumption and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If physical activation at extremely high temperature (>800°C) is used, then activated carbon with high surface area is produced, but energy consumption increases significantly
Solution Approach 1:
The invention changes the temperature parameter from extremely high (>800°C) to moderate (350-500°C) by introducing chemical activation catalysts (persulfates), allowing activation to occur at lower temperatures while still achieving high surface area and adsorption capacity
Solution Approach 2:
The invention introduces persulfate catalysts (ammonium persulfate, sodium persulfate, or potassium persulfate) as intermediaries to facilitate the activation process, enabling chemical activation that produces activated carbon with comparable or superior properties to physical activation but at lower energy input
2Area of stationary object
If chemical activation with highly hazardous chemicals (nitric acid, phosphoric acid, sulfuric acid, potassium hydroxide) is used, then activated carbon is produced, but safety risks and environmental hazards increase
Solution Approach 1:
The invention replaces expensive and hazardous chemicals with cheaper, safer persulfate catalysts that are less hazardous and more environmentally friendly, achieving the same activation effect without the severe safety and environmental risks of traditional strong acids and bases
Solution Approach 2:
The invention converts the previously harmful effect of using hazardous chemicals into a beneficial process by using mild persulfate catalysts that achieve effective activation while eliminating safety risks and environmental contamination associated with strong acids and bases
3Area of stationary object
If charcoal is used as feedstock for activated carbon production, then activated carbon is produced, but production cost increases
Solution Approach 1:
The invention changes the feedstock parameter from expensive charcoal to low-cost carbon black waste, and combines this with moderate temperature activation (350-500°C) using persulfate catalysts to achieve high surface area activated carbon at reduced production cost
Solution Approach 2:
The invention converts the previously harmful waste material (carbon black from incineration) into a valuable resource for producing activated carbon, transforming an environmental problem into an economic benefit while reducing raw material costs
4Ease of manufacture
If low-grade carbon black waste is used as feedstock, then production cost is reduced, but adsorption capacity and surface area are insufficient
Solution Approach 1:
The invention changes the chemical treatment parameters by using persulfate catalysts at moderate temperatures (350-500°C) to effectively activate low-grade carbon black waste, transforming it into high-performance activated carbon with superior surface area and adsorption capacity
Solution Approach 2:
The invention introduces persulfate catalysts as intermediaries to enable effective activation of low-grade carbon black waste, allowing the material to achieve high surface area and adsorption capacity that would otherwise require expensive feedstocks to attain
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 method achieves higher yields and lower energy requirements, producing activated carbon with enhanced surface area and adsorption capacity, making it a cost-effective and environmentally friendly alternative for industrial applications.
Implementation Method 1
Chemical activation was carried out involves using highly hazardous chemicals like nitric acid, phosphoric acid, sulfuric acid and potassium hydroxide to induce the activation
Implementation Method 2
mixing carbon black with an activation catalyst in a polar solvent to form a mixture; heating the mixture at about 350° C. to about 500° C. in order to form the activated carbon; wherein the activation catalyst is selected from ammonium persulfate, sodium persulfate, potassium persulfate
Implementation Method 3
Existing physical activation needs extremely high temperature (>800° C.) in the presence of steam, air, CO2, N2 and inert gases
Implementation Method 4
heating the mixture at about 350° C. to about 500° C. in order to form the activated carbon
Implementation Method 5
the solvent enables a substantial mixing (or complete mixing) of the carbon black and the activation catalyst such that the activation catalyst can at least be adsorbed on the surface of carbon black
Data Source
AI summary
The present invention relates, in general terms, to methods of forming activated carbon. The method of forming activated carbon comprises mixing carbon black with an activation catalyst and heating the carbon black in order to form the activated carbon. The present invention also relates to applications of activated carbon as disclosed herein. In a preferred embodiment, the activation catalyst is selected from ammonium persulfate, sodium persulfate, potassium persulfate or a combination thereof.