Quaternized Cellulose Resin for Recoverable PFAS Adsorption

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Solution Overview

Problem

Existing aminated resin materials for PFAS removal require toxic reagents and organic solvents, making them environmentally unfriendly and difficult to recover, limiting their scalability and effectiveness in water purification.

Innovation Solution

A quaternized cellulose-based resin is prepared using a green process involving cellulose from traditional Chinese medicine waste residues, modified with chloromethylated polystyrene through quaternization, avoiding toxic reagents and enabling easy recovery and large-scale use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional aminated resin materials are used for PFAS adsorption, then adsorption effectiveness is improved, but environmental friendliness deteriorates due to requirement of toxic reagents and organic solvents

Engineering Contradiction:

Improveadsorption effectivenessVSAvoidenvironmental friendliness

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention changes the chemical composition parameters by replacing toxic organic amine reagents with cellulose-based materials and substituting harmful organic solvents with water as the reaction medium. This parameter substitution maintains the adsorption functionality while eliminating environmental harm, directly resolving the contradiction between effectiveness and environmental friendliness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite material system combining cellulose (from renewable biomass) with quaternary ammonium functional groups. This composite structure integrates the biodegradability and eco-friendliness of cellulose with the effective PFAS adsorption capability of quaternary ammonium groups, achieving both high reliability and environmental compatibility

Inventive Principle:

Principle #40Composite materials

2Reliability

If traditional aminated resin materials are used, then adsorption capability is improved, but ease of recovery deteriorates

Engineering Contradiction:

Improveadsorption capabilityVSAvoidease of recovery

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The invention modifies the physical and chemical parameters of the resin by incorporating cellulose-based components with specific surface properties and porosity. These parameter changes enhance both the adsorption capability through increased surface area and the ease of recovery through optimized particle morphology and reduced aggregation, simultaneously improving both features

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If green preparation methods are adopted, then environmental friendliness is improved, but manufacturing complexity increases due to avoidance of toxic reagents

Engineering Contradiction:

Improveenvironmental friendlinessVSAvoidmanufacturing complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The invention employs cellulose, a naturally occurring and readily available biomass material, as the base component. This self-service approach utilizes abundant renewable resources that require minimal processing and eliminate the need for complex synthesis procedures involving toxic reagents, thereby reducing manufacturing complexity while maintaining environmental friendliness

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention introduces water as an intermediary reaction medium instead of organic solvents. This intermediary substitution simplifies the manufacturing process by eliminating the need for specialized handling, disposal, and safety protocols associated with toxic chemicals, reducing overall manufacturing complexity while preserving green chemistry principles

Inventive Principle:

Principle #24Intermediary (Mediator)

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 quaternized cellulose-based resin effectively removes perfluorinated substances like PFOA and PFOS from drinking water, ensuring safety and compliance with drinking water standards, while being easy to separate and recover, thus preventing PFAS pollution.

Implementation Method 1

adsorption is the simplest and most cost-effective method to remove the PFAS

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS20250333546A1Quaternized cellulose-based resin and preparation method and application thereof

Publication Date: 2025.10.30 SHANGHAI JIAOTONG UNIV

AI summary

Disclosed are a quaternized cellulose-based resin and a preparation method and application thereof. Cellulose extracted from traditional Chinese medicine waste residues is subjected to functional modification, and then grafted to a surface of chloromethylated polystyrene, so as to obtain the quaternized cellulose-based resin. The preparation method does not involve toxic reagents, is green and environment-friendly, is low in cost, and effectively prevents and controls PFAS pollution while realizing harmless treatment and resource utilization of solid wastes, thus ensuring the safety of drinking water. The quaternized cellulose-based resin comprises the chloromethylated polystyrene and the quaternized cellulose modified on the surface of the chloromethylated polystyrene. The quaternized cellulose-based resin is easy to recover, is used on a large scale, solves the problem that a powder adsorbent is difficult to recover and use on a large scale, has good stability, and effectively removes trace perfluorinated substances in drinking water.