Hydrophobic Deep Eutectic Solvents for Microplastic Extraction
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Solution Overview
Problem
Current methods are inadequate for detecting and extracting micro- and nano-scale plastic particles (microplastics and nanoplastics) from water samples due to their small size and difficulty in remediation, which poses ecological and health risks.
Innovation Solution
The use of hydrophobic deep eutectic solvents (DES) to enrich and extract plastic contaminants from water samples by mixing them with a hydrophobic DES, allowing for phase separation and subsequent examination or removal of contaminants, utilizing specific hydrogen bond acceptors and donors in various molar ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional detection and extraction methods are used, then the process is simple and cost-effective, but they are ineffective for micro- and nano-scale plastic particles due to their small size
Solution Approach 1:
The patent introduces hydrophobic deep eutectic solvents as an intermediary substance that selectively binds to plastic contaminants through hydrogen bonding. This mediator enables the detection and extraction of micro- and nanoplastics by forming complexes that can be separated from water samples, thereby resolving the limitation of traditional methods that cannot effectively detect such small particles
Solution Approach 2:
The invention changes the chemical parameters of the detection system by using deep eutectic solvents with specific hydrogen bond donor and acceptor ratios. By adjusting the molar ratios of components like choline chloride and organic acids, the system optimizes its binding affinity for plastic particles, enabling effective detection of nanoplastics while maintaining a relatively simple procedural framework
2Reliability
If hydrophobic deep eutectic solvents are used to extract plastic contaminants, then extraction efficiency increases to 60-90%, but the process complexity increases due to multiple steps including mixing, phase separation, and examination
Solution Approach 1:
The patent utilizes phase transition principles by employing hydrophobic deep eutectic solvents that form distinct phases when mixed with aqueous samples. The phase separation process naturally concentrates plastic contaminants in the organic phase, achieving 60-90% extraction efficiency. While this adds processing steps, the phase transition mechanism automates the separation process, reducing manual intervention time
Solution Approach 2:
The method performs preliminary enrichment of plastic contaminants in the hydrophobic phase before final analysis. This preliminary concentration step simplifies subsequent detection by providing a more concentrated sample, thereby compensating for the additional mixing and separation steps with reduced analysis time and improved overall workflow efficiency
3Reliability
If nanoplastics are detected and extracted, then contamination levels decrease, but the difficulty of collecting nanoplastics from water remains high due to their small size
Solution Approach 1:
The hydrophobic deep eutectic solvent acts as a mediator that selectively binds to nanoplastics through hydrogen bonding interactions. This binding forms larger complexes that are easier to collect and analyze, thereby resolving the collection difficulty inherent in detecting free-floating nanoplastics. The mediator enables both effective contaminant removal and simplified collection procedures
Solution Approach 2:
The patent employs optical density measurements and microscopy to detect the presence of plastic contaminants in the hydrophobic phase. By monitoring changes in optical properties after phase separation, the system can quantify nanoplastic contamination levels and confirm successful extraction, thereby overcoming the detection difficulties posed by the small size of nanoplastics
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
Effectively extracts at least 60% to 90% of plastic contaminants from water samples, reducing contamination and enabling efficient detection and quantification of micro- and nanoplastics without polluting the aqueous system.
Implementation Method 1
mixing the water sample with the deep eutectic solvent to form a mixture, and then examining the hydrophobic DES for plastic contaminant enrichment following phase separation between the hydrophobic DES and an aqueous portion of the mixture
Implementation Method 2
introducing the water sample to a hydrophobic DES; and examining the hydrophobic DES for plastic contaminant enrichment
Implementation Method 3
utilizing specific hydrogen bond acceptors and donors in various molar ratios
Data Source
AI summary
Methods for detecting and extracting plastic contaminants within a water sample, which involve introducing the water sample to a hydrophobic deep eutectic solvent, are provided.