Covalently Functionalized Magnetic Nanoparticles for Water Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for preparing hydrophilic magnetic nanoparticles for forward osmosis require high energy consumption and the use of high-boiling point organic solvents, making them inefficient and costly for water purification applications.
Innovation Solution
A method involving the formation of a hydrophilic polymer coating layer on magnetic metal cores coated with carbon, using diazonium chemistry and atom transfer radical polymerization to create covalently functionalized magnetic nanoparticles that can be efficiently produced at low temperatures without organic solvents, enhancing their dispersibility and separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If thermal decomposition method is used to prepare hydrophilic magnetic nanoparticles, then the dispersibility of nanoparticles is improved, but the energy consumption increases significantly
Solution Approach 1:
The patent changes the temperature parameter from high (150-500°C thermal decomposition) to low (room temperature or mild heating), and changes the solvent parameter from high-boiling point organic solvents to water or low-boiling point solvents, thereby achieving nanoparticle dispersibility without high energy consumption
Solution Approach 2:
The patent replaces the thermal decomposition mechanism with alternative mechanisms such as co-precipitation, solvothermal synthesis, or chemical reduction, which can produce hydrophilic magnetic nanoparticles without requiring high temperature and high energy input
2Stability of the object's composition
If high-boiling point organic solvents are used in nanoparticle preparation, then the hydrophilic polymer coating can be formed, but the environmental impact and cost increase
Solution Approach 1:
The patent extracts and removes the harmful high-boiling point organic solvents from the preparation process, replacing them with environmentally friendly alternatives such as water, ethanol, or other low-toxicity solvents, while still achieving effective hydrophilic polymer coating on magnetic nanoparticles
Solution Approach 2:
The patent uses inexpensive and easily removable solvents such as water or low-boiling point alcohols that can be easily evaporated or recovered, replacing expensive and environmentally problematic high-boiling point organic solvents
3Productivity
If elevated temperature is used for nanoparticle synthesis, then the reaction rate and coating formation are improved, but the equipment complexity and operational difficulty increase
Solution Approach 1:
The patent changes the temperature parameter from high to low, and adjusts other parameters such as pH, solvent composition, or catalyst concentration to maintain adequate reaction rates without requiring high temperature equipment, thereby simplifying the synthesis apparatus and operational procedures
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 results in highly hydrophilic magnetic nanoparticles with high saturation magnetization and stability, allowing for efficient separation and regeneration, reducing energy consumption and environmental impact while improving the osmotic pressure for water treatment processes.
Implementation Method 1
magnetic metal core
Implementation Method 2
hydrophilic polymer coating layer
Implementation Method 3
coated with a carbon coating
Implementation Method 4
Osmosis is the movement of a solvent across a semipermeable membrane towards a higher concentration of solute
Implementation Method 5
The driving force in FO is an osmotic pressure gradient
Data Source
AI summary
The present disclosure relates to a method for manufacturing a covalently functionalized coated magnetic nanoparticle and to said particles and uses thereof. The preparation method includes forming a shell of a hydrophilic polymer coating layer on top of a magnetic metal core coated with a carbon coating. In the method a particle comprising a magnetic metal core coated with a carbon coating is provided. The surface of the particle is subjected to covalent functionalization by generating amino reactive groups via diazonium chemistry and subsequently an irreversible attachment of an atom transfer radical polymerization (ATRP) initiator is carried out on said surface. A hydrophilic polymer layer is formed) by a surface initiated atom transfer radical polymerization (SI-ATRP) reaction with a monomer comprising N-isopropylacrylamide (NIPAM).