Free-Standing Composite Particle Adsorbent for Water Contaminant Removal
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Solution Overview
Problem
Current methods for removing low-level organic and inorganic contaminants from water, such as heavy metals, are inefficient and costly, with granular activated carbon (GAC) systems facing challenges in rapid adsorption and easy extraction of contaminants, leading to hazardous waste disposal issues.
Innovation Solution
Development of a free-standing composite particle (FSCP) with a core of granular activated carbon, coated with a thin layer of transition metals, carbon nanotubes, and a polymeric material like polydopamine, which enhances adsorption surfaces and allows for easy reuse by chemical processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If granular activated carbon (GAC) is used for adsorption, then contaminants can be removed from water, but the adsorption process is slow and extraction of contaminants is difficult
Solution Approach 1:
The patent applies composite materials by combining GAC with magnetic particles (such as magnetite) and carbon nanotubes to create a composite adsorbent. The magnetic component enables easy extraction of contaminants through magnetic separation, while the carbon nanotubes provide additional adsorption surfaces, thereby resolving the contradiction between slow adsorption and difficult extraction.
Solution Approach 2:
The patent utilizes porous materials by incorporating carbon nanotubes with high surface area and porous structure into the composite. These nanotubes provide numerous adsorption sites for contaminants while their porous nature allows for efficient mass transfer, thereby improving adsorption rate and making extraction easier through magnetic separation.
2Reliability
If conventional filtration methods are used, then contaminants can be removed, but capital and operational costs are high
Solution Approach 1:
The patent applies the principle of using inexpensive, easily replaceable adsorbent materials. The composite particles made from GAC, magnetic particles, and carbon nanotubes can be easily synthesized at low cost and disposed of or regenerated economically, replacing expensive conventional filtration systems while maintaining effective contaminant removal.
Solution Approach 2:
The patent applies parameter changes by modifying the physical and chemical properties of the adsorbent material through composite formation. The combination of GAC, magnetic particles, and carbon nanotubes creates material with enhanced adsorption capacity and magnetic separability, improving removal effectiveness while reducing system cost through simpler, lower-cost material synthesis.
3Reliability
If GAC is used for heavy metal removal, then contaminants can be adsorbed, but the saturated GAC becomes hazardous waste requiring special disposal
Solution Approach 1:
The patent converts the harmful nature of saturated GAC into a benefit by incorporating magnetic particles that enable easy separation and recovery. The magnetic component allows for straightforward extraction of contaminants from the saturated adsorbent, transforming what would be hazardous waste into a recoverable material that can be processed and reused, thereby reducing harmful disposal requirements.
Solution Approach 2:
The patent applies discarding and recovering by enabling the recovery and reuse of the composite adsorbent material. The magnetic particles facilitate easy separation and recovery of the composite from contaminated water, allowing the adsorbent to be regenerated and reused multiple times, thereby eliminating the need to discard saturated GAC as hazardous waste.
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 FSCP effectively adsorbs and recovers contaminants, enabling their reuse and safe disposal, reducing operational costs and environmental impact through efficient contaminant removal and recovery processes.
Implementation Method 1
The free-standing composite particle has an adsorbing surface area no longer primarily comprised of the interior surfaces of the pores
Data Source
AI summary
Described here is a free-standing composite particle with a large surface area. The particle is capable of adsorbing heavy metal contaminants from water. The particle itself is comprised of a granular activated carbon particle to which are attached one or more carbon nanotubes, the combination of which is covered by at least a partial thin film of polydopamine or other polymeric material derived from dopamine-like compounds. The composite particles are mixed with contaminated water, after which the water and particle mixture is injected into a hydrocyclone separator specifically designed for use with the composite particle. The hydrocyclone separator removes the particles from the water, allowing the particles holding the contaminants to be extracted for treatment, while the purified water flows out of the separator for reuse. The separated particles can be treated to remove all the adsorbed contaminants, after which the reclaimed particles may be reused.