Silver-Impregnated 2D Materials for Bromide Removal
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Solution Overview
Problem
Current methods for removing bromide from water are inefficient due to its low concentration and interference from competing ions and organic matter, which hinders the selective removal of bromide and leads to the formation of toxic disinfection by-products during water treatment.
Innovation Solution
Silver-impregnated two-dimensional materials, such as graphene and graphene oxide, are used to selectively remove bromide from water by forming insoluble silver bromide, minimizing interference from other anions and organic compounds, and can be separated using filtration or flotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If activated carbon is used as support for silver, then bromide removal capacity is improved, but the porous structure blocks easily in complex water matrices reducing silver availability
Solution Approach 1:
The patent uses activated carbon's porous structure to load silver, but addresses the blocking issue by combining it with nanofiber matrices that maintain open pore structures, preventing fouling while preserving silver's accessibility for bromide removal
Solution Approach 2:
The patent creates composite materials combining activated carbon with nanofibers (e.g., PVDF, PAN) to form a hierarchical structure that leverages the high silver loading capacity of activated carbon while the nanofiber component prevents pore blocking and maintains water flow, ensuring continuous silver availability
2Productivity
If high silver loading is used, then bromide removal efficiency is improved, but competing anions like chloride reduce silver availability for bromide interactions
Solution Approach 1:
The patent modifies the local chemical environment around silver particles by using functionalized nanofibers and specific carbon surface treatments that create localized zones with enhanced affinity for bromide over chloride, allowing selective bromide removal even at high silver loadings
Solution Approach 2:
The patent adjusts parameters such as pH, ionic strength, and surface functionalization to optimize the electrostatic and chemical interactions between silver and halide ions, enhancing bromide selectivity while maintaining high removal efficiency in the presence of competing anions
3Quantity of substance
If conventional sorbents are used, then organic matter removal is improved, but bromide removal becomes more difficult and expensive due to lower concentration and competitive ions
Solution Approach 1:
The patent develops multi-functional sorbents that can simultaneously remove organic matter and bromide by integrating materials with both high organic affinity (activated carbon) and high silver loading capacity, enabling dual functionality in a single treatment step
Solution Approach 2:
The patent merges organic matter removal capabilities with bromide removal capabilities by combining activated carbon and silver-loaded nanofibers into integrated composite systems, allowing simultaneous treatment of both contaminants and reducing overall process complexity and cost
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 open structure of these materials enhances silver availability for bromide interaction, achieving high bromide removal efficiency with reduced competition from co-occurring anions and organic matter, thereby reducing the formation of toxic disinfection by-products.
Implementation Method 1
silver ions (Ag+) can react with bromide to form insoluble precipitates (AgBr(s))
Implementation Method 2
The high tortuosity of activated carbon may also limit the kinetics of bromide diffusion and its reaction with silver
Data Source
AI summary
Compositions for bromide removal include a two-dimensional material impregnated with silver. The silver may be impregnated in the two-dimensional material by contacting the two-dimensional material with silver ions in an aqueous solution, allowing the silver ions to adsorb on the two-dimensional material, and drying the two-dimensional material. Removing bromide from an aqueous composition including bromide may include contacting the aqueous composition with a two-dimensional material impregnated with silver, and allowing the bromide to react with the silver to yield silver bromide.