Superparamagnetic Adsorbents for Oil Removal
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Solution Overview
Problem
Current methods for removing oil stains from water are inefficient and environmentally harmful, as they often rely on non-biodegradable materials that cannot be easily reused or regenerated, posing a risk of secondary pollution.
Innovation Solution
The synthesis of superparamagnetic adsorptive nanomaterials with an iron oxide spinel crystal structure and a functional organic coating using tetra-alkoxide and tri-alkoxide precursors, allowing for effective adsorption of oil stains and their subsequent removal using an external magnetic field, with a capacity to adsorb 2.0 to 4.0 g of oil per gram of adsorbent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional cleaning methods (aerogels, dispersants, membranes, filters) are used to remove oil spills, then oil adsorption capacity is achieved, but recovery and reuse become difficult and secondary pollution risk increases
Solution Approach 1:
The patent replaces mechanical filtration and physical separation methods with magnetic field-based separation. Superparamagnetic iron oxide nanoparticles functionalized with oleophilic groups adsorb oil from water, and the magnetic field enables easy recovery and reuse of the nanoparticles, eliminating the difficulty of recovery associated with conventional methods.
Solution Approach 2:
The invention creates a composite material system combining superparamagnetic iron oxide core with oleophilic functional coating. This composite structure provides both high oil adsorption capacity through the oleophilic surface and easy magnetic separability through the superparamagnetic core, simultaneously addressing both requirements.
2Quantity of substance
If non-biodegradable adsorbent materials (silicon dioxide, titanium dioxide, zinc oxide, aluminum oxide) are used, then oil adsorption is achieved, but regeneration and reuse become difficult causing secondary pollution
Solution Approach 1:
The patent implements a recovery and regeneration system where superparamagnetic nanoparticles are discarded into the water-oil mixture for adsorption, then recovered using magnetic fields, and regenerated for repeated use. This eliminates the need to discard non-biodegradable materials and prevents secondary pollution from waste adsorbents.
Solution Approach 2:
The invention changes the magnetic parameter of the adsorbent material by using superparamagnetic iron oxide nanoparticles. This parameter change enables the material to respond to external magnetic fields for easy recovery and regeneration, transforming the material from a single-use non-biodegradable adsorbent to a reusable sustainable solution.
3Reliability
If surface-functionalized superparamagnetic nanomaterials are synthesized with complex coating processes, then adsorption properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by functionalizing only the surface of the superparamagnetic iron oxide nanoparticles with oleophilic groups, while maintaining the simple bulk magnetic core structure. This localized functionalization provides high adsorption selectivity for oil without requiring complex modification of the entire material structure, thus balancing performance with manufacturing simplicity.
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
This approach enables efficient, cost-effective, and environmentally friendly oil spill remediation by enhancing the rate of oil removal from water and stabilizing the surface of nanoparticles, while allowing for regeneration and reuse of the adsorbent, thus reducing environmental impact.
Implementation Method 1
superparamagnetic nanoparticles that respond to an external magnetic field, but do not permanently become magnetic themselves
Implementation Method 2
Magnetic properties of nanoparticles would allow the removal of nanoparticles, after the adsorption of oils from the solution, with the aid of an external magnetic field
Implementation Method 3
functional organic coating based on alkoxide precursors... with the purpose of forming a homogeneous siloxane coating obtaining specific physico-chemical properties... and the effective and selective removal of oil stains from water
Implementation Method 4
hydrophilicity/hydrophobicity (oleophilicity/oleophobicity)... capacity adsorption in the range (2.0 to 4.0) g of oil/g of adsorbent
Implementation Method 5
surface-functionalized superparamagnetic nanomaterials with alkoxide precursors are being developed by conventional sol-gel method using hydrolysis and polycondensation of alkoxysilanes in an alcoholic medium in the the presence of a alkaline catalyst, with the purpose of forming a homogeneous siloxane coating
Implementation Method 6
conventional sol-gel method using hydrolysis and polycondensation of alkoxysilanes
Implementation Method 7
conventional sol-gel method using hydrolysis and polycondensation of alkoxysilanes
Data Source
Figure 1~2
Figure 3
AI summary
The present invention belongs to the field of procedures for the removal of oily stains from the water, more precisely to the field of preparation procedures of superparamagnetic adsorptive nanomaterials based on iron oxide nanoparticles. Preparation process of functionalized superparamagnetic adsorbents with trimethoxy (1H, 1H, 2H, 2H-nonafluoroheksyl)silane (NFHTMS) as precursor allows preparation of adsorbents which enable adsorption of oil stains with a capacity in the range 2.0 to 4.0 g of oil/g of adsorbent, and nanostructured core based on iron oxide nanoparticles CoFe2O4 with spinel crystal structure, enabling responsiveness and maneuverability of nanostructures under the influence of an external magnetic field and further, via the functionality of the surface, adsorption and removing of oil stains, recovery and re-use.