MXene Nanosheet Ink for Palladium Recovery Without Nanosheet Release

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Solution Overview

Problem

Existing methods for palladium recovery face challenges such as low adsorption efficiency and potential environmental pollution due to the small size and handling of MXene nanosheets, and the need for improved recovery efficiency in aqueous solutions.

Innovation Solution

A MXene nanosheet ink is developed with controlled surface functional group density and zeta potential, allowing for high adsorption and reduction of palladium ions through electrostatic attraction and redox reactions, followed by aggregation and precipitation, achieving up to 1900 mg/g adsorption capacity and 100% recovery efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If MXene nanosheets are used for palladium recovery, then adsorption efficiency is improved, but handling difficulty and environmental pollution risk increase due to their very small size

Engineering Contradiction:

Improveadsorption efficiencyVSAvoidhandling difficulty

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent uses a binder as an intermediary substance to aggregate MXene nanosheets into larger particles. The binder coats the nanosheets and causes them to clump together, forming recoverable aggregates that maintain the high surface area of individual nanosheets while enabling easy separation from the solution through filtration or sedimentation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The binder forms a thin film or coating around the MXene nanosheets, creating a flexible shell structure that holds the nanosheets together in aggregates. This shell allows the nanosheets to maintain their structural integrity and adsorption capabilities while being contained in a form that is easy to handle and recover.

Inventive Principle:

Principle #30Flexible shells and thin films

2Productivity

If MXene nanosheets are used for palladium recovery, then adsorption efficiency is improved, but secondary environmental pollution is caused by nanosheet release

Engineering Contradiction:

Improveadsorption efficiencyVSAvoidsecondary environmental pollution

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The binder acts as a mediator that prevents MXene nanosheets from being released into the environment. By coating and binding the nanosheets together, it creates a contained structure that remains intact during the recovery process, preventing nanosheet dispersion and potential environmental contamination.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The binder forms a protective shell around the MXene nanosheets that prevents their release. This shell structure ensures that even when aggregates are handled or processed, individual nanosheets remain contained and do not escape into the environment, thereby preventing secondary pollution.

Inventive Principle:

Principle #30Flexible shells and thin films

3Ease of operation

If MXene nanosheets are immobilized onto sheets or beads, then recovery is facilitated, but adsorption efficiency decreases due to increased weight

Engineering Contradiction:

Improverecovery facilitationVSAvoidadsorption efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

Instead of immobilizing nanosheets onto large sheets or beads, the patent segments the nanosheets into recoverable aggregates of appropriate size. These aggregates maintain the high surface area-to-mass ratio of individual nanosheets while being large enough for easy recovery, avoiding the weight penalty of traditional immobilization substrates.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The binder forms a thin film around the nanosheet aggregates rather than requiring a bulky substrate. This thin shell provides structural support for recovery while minimizing added weight, preserving the high adsorption efficiency of the MXene nanosheets.

Inventive Principle:

Principle #30Flexible shells and thin films

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 MXene nanosheet ink significantly enhances palladium ion recovery efficiency, achieving high adsorption capacity and selectivity, with the recovered palladium usable as an electrochemical catalyst for hydrogen evolution reactions.

Implementation Method 1

the adsorption mechanism of palladium ions through electrostatic attraction

Methodology Applied

Scientific EffectElectrostatic attraction: Electrostatics

Implementation Method 2

the reduction mechanism of palladium ions via a redox reaction between palladium ions and MXene nanosheets

Methodology Applied

Scientific EffectRedox reaction: Redox Reactions

Implementation Method 3

followed by aggregation and precipitation

Methodology Applied

Scientific EffectPrecipitation: Precipitation

Data Source

PatentUS20260014540A1Mxene nanosheet ink for palladium recovery and its manufacturing method, palladium recovery method using mxene nanosheet ink, and electrochemical catalyst using recovered palladium and its manufacturing method

Publication Date: 2026.01.15 KOREA INST OF SCI & TECH

AI summary

The present invention relates to a MXene nanosheet ink for palladium recovery, a method of manufacturing the same, a method of recovering palladium using a MXene nanosheet ink, an electrochemical catalyst using recovered palladium, and a method of manufacturing the same that are capable of significantly improving the recovery efficiency of palladium ions in water.