Dendrimeric Carbon Dot-Polyamide Membranes for Water Purification

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Solution Overview

Problem

Existing membrane technologies for water filtration, such as thin-film-composite (TFC) membranes, face challenges in efficiently removing a wide range of impurities, including heavy metals, salts, and organic contaminants, due to limitations in surface charge and hydrophilicity.

Innovation Solution

The development of dendrimeric carbon dot-polyamide membranes, which incorporate polyamidoamine (PAMAM) dendrimeric carbon dots into the polyamide active layer, enhancing the membrane's hydrophilicity and filtration efficiency by providing additional protonation/deprotonation sites.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional thin-film-composite membranes are used, then the membrane provides mechanical support and basic filtration, but the rejection efficiency for heavy metals, salts, and organic contaminants is insufficient

Engineering Contradiction:

Improverejection efficiencyVSAvoidmembrane structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent incorporates dendrimeric carbon dots into the polyamide active layer to create a composite membrane structure. The carbon dots serve as functional fillers that enhance the membrane's ability to reject heavy metals, salts, and organic contaminants while maintaining the structural integrity provided by the polyamide matrix.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The dendrimeric carbon dots are specifically incorporated into the active layer where filtration occurs, providing localized enhancement of rejection efficiency. The functional groups on the carbon dot surfaces create localized protonation/deprotonation sites that selectively interact with contaminants at the filtration interface.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the polyamide active layer is made more hydrophobic to improve mechanical stability, then the membrane durability increases, but the ability to remove polar contaminants and heavy metals decreases

Engineering Contradiction:

Improvemembrane stabilityVSAvoidcontaminant removal efficiency

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent modifies the surface chemistry parameters of the polyamide active layer by incorporating carbon dots with tunable surface functional groups. These functional groups can be adjusted to alter the hydrophilicity, surface charge, and protonation behavior of the membrane, enabling optimized contaminant removal while maintaining stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The carbon dots introduce localized regions with enhanced hydrophilicity and protonation capability within the polyamide matrix. These localized modifications create specific interaction zones for contaminant removal without compromising the overall mechanical stability of the membrane structure.

Inventive Principle:

Principle #3Local quality

3Reliability

If dendrimeric carbon dots are incorporated into the polyamide active layer, then the rejection efficiency for heavy metals and organic contaminants increases to 100%, but the manufacturing process complexity increases

Engineering Contradiction:

Improverejection efficiencyVSAvoidmanufacturing process simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The dendrimeric carbon dots are pre-synthesized and characterized before incorporation into the polyamide active layer. This preliminary preparation allows for controlled addition of the functional particles during membrane fabrication, simplifying the overall manufacturing process by separating the complex carbon dot synthesis from the membrane formation steps.

Inventive Principle:

Principle #10Preliminary action

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 dendrimeric carbon dot-polyamide membranes demonstrate improved rejection efficiency for heavy metals, salts, and organic contaminants, with rejection rates of 100% for heavy metals and organic pollutants, and over 94% for certain salts, compared to unmodified membranes.

Implementation Method 1

enhancing the membrane's hydrophilicity and filtration efficiency by providing additional protonation/deprotonation sites

Methodology Applied

Scientific EffectProtonation/Deprotonation:

Implementation Method 2

The dendrimeric carbon dot-polyamide membranes demonstrate improved rejection efficiency for heavy metals, salts, and organic contaminants

Methodology Applied

Scientific EffectElectrostatic interaction: Ion Repulsion/Attraction

Implementation Method 3

enhancing the membrane's hydrophilicity and filtration efficiency

Methodology Applied

Scientific EffectHydrophilicity enhancement: Hydrophile

Implementation Method 4

The thin-film-composite (TFC) membranes include a substrate layer and an interfacial polymerized polyamide (PA) active layer

Methodology Applied

Scientific EffectInterfacial polymerization: Chemical Bonding

Data Source

PatentUS12274988B2Dendrimeric carbon dot-polyamide membranes

Publication Date: 2025.04.15 SAUDI ARABIAN OIL CO

AI summary

A dendrimeric carbon dot-polyamide membrane, a method for making the dendrimeric carbon dot-polyamide membrane, and a method for producing purified water are provided. An exemplary carbon dot-polyamide membrane includes polyamidoamine dendrimeric carbon dots and a polyamide membrane. The polyamidoamine dendrimeric dots are dispersed throughout the polyamide membrane.