MXene Sorbent Composition for Selective Urea Removal in Dialysate
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Solution Overview
Problem
Current hemodialysis systems, including wearable artificial kidneys, face challenges in efficiently removing urea without causing side effects such as electrolyte imbalances or clotting, and existing carbon sorbents are ineffective in adsorbing urea effectively.
Innovation Solution
Utilizing MXene compositions, which are two-dimensional transition metal carbides and nitrides, to adsorb urea from aqueous solutions, including blood and dialysate, at ambient temperatures, thereby reducing urea concentrations by up to 90% or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hemodialysis systems are used to remove urea from blood, then urea removal is achieved, but the systems are cumbersome, time-consuming, and inefficient
Solution Approach 1:
The patent employs MXene materials with controlled porosity and surface area to enhance urea adsorption capacity. The porous structure allows efficient diffusion of urea molecules while maintaining a compact device form factor, resolving the contradiction between removal efficiency and device complexity.
Solution Approach 2:
The invention uses composite MXene structures combining different transition metal carbides/nitrides with tailored surface chemistries. These composite materials provide enhanced urea selectivity and adsorption kinetics, enabling high productivity without requiring complex system architectures.
2Object-affected harmful factors
If zirconium phosphate is used to remove ammonia from dialysate, then ammonia is removed, but potassium, calcium, magnesium and other necessary electrolytes are also removed
Solution Approach 1:
The patent applies local quality modification by functionalizing specific regions of the MXene surface with particular terminations (e.g., -OH, -O, -F groups) that create selective binding sites. This local functional differentiation enables ammonia removal while preserving electrolyte passage, resolving the selectivity contradiction.
Solution Approach 2:
The invention utilizes parameter changes in the MXene crystal structure and surface termination composition to tune adsorption selectivity. By adjusting the M-X ratio and surface termination types, the material can be optimized to preferentially bind ammonia over essential electrolytes, maintaining reliability while removing harmful factors.
3Productivity
If ion exchange sorbents are used for hemofiltration to provide effective clearance, then clearance is improved, but bicarbonate and sodium are released causing electrolyte imbalances
Solution Approach 1:
The patent replaces the ion exchange mechanism (chemical reaction-based) with pure physical adsorption on MXene surfaces. This substitution eliminates the stoichiometric release of counter-ions (bicarbonate, sodium) that occurs in ion exchange processes, achieving high clearance efficiency without generating harmful electrolyte releases.
4Object-affected harmful factors
If conventional carbon sorbents are used for detoxification, then general toxin removal is achieved, but urea cannot be efficiently adsorbed
Solution Approach 1:
The invention fundamentally changes the material parameters from conventional carbon sorbents to MXene transition metal carbides/nitrides. This parameter change in composition and electronic structure creates surface properties that are highly selective and efficient for urea adsorption, overcoming the limitation of conventional carbon materials while maintaining general detoxification capabilities.
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
MXenes efficiently and selectively remove urea from low concentration solutions within minutes, maintaining the integrity of blood products for further use, and do not cause electrolyte imbalances or clotting, thus enhancing the efficiency of dialysis treatments.
Implementation Method 1
MXenes, a new class of two-dimensional transition metal carbides and nitrides, to selectively adsorb urea from aqueous solutions
Data Source
AI summary
The present disclosure is directed to methods for scrubbing low levels of urea from aqueous solutions such as a dialysate from dialysis, and including blood and blood products, and devices capable of employing these methods.