Acid Grafted Graphene Polystyrene Adsorbent for Oil-Water Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current materials for separating oil from water, such as spongy graphene, exhibit poor stability and efficiency due to agglomeration, leading to adverse environmental effects and inadequate oil adsorption capacity.
Innovation Solution
An adsorbent polymeric structure comprising a graphene-containing moiety grafted with polystyrene is developed through an esterification and emulsion polymerization process, creating a superhydrophobic and oleophilic material with enhanced oil adsorption capacity, characterized by a high Brunauer-Emmett-Teller (BET) surface area and increased weight gain ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If spongy graphene is used as an adsorbent material, then oil adsorption capacity is improved, but stability deteriorates due to agglomeration
Solution Approach 1:
The patent creates a composite material by grafting polystyrene chains onto graphene sheets, forming a stable polymeric structure that combines the high surface area of graphene with the stability of crosslinked polystyrene networks, preventing agglomeration while maintaining oil adsorption capacity
Solution Approach 2:
The patent segments the graphene structure by introducing crosslinked polystyrene chains that act as spacers, dividing the continuous graphene sheets into separated units that resist agglomeration while preserving the adsorptive surface area
2Quantity of substance
If adsorbent material is designed for high oil adsorption, then adsorption capacity is improved, but water adsorption increases adversely
Solution Approach 1:
The patent applies local quality by creating superhydrophobic regions on the graphene surface through polystyrene grafting, making specific areas repellant to water while maintaining oleophilic properties for oil adsorption, thus achieving selective adsorption behavior
3Productivity
If current separation materials are used, then oil removal is achieved, but environmental harm increases due to poor efficiency
Solution Approach 1:
The patent changes the physical and chemical parameters of the adsorbent material by controlling the degree of grafting, crosslinking density, and polymer chain length, optimizing the material for high efficiency oil removal while minimizing environmental impact through reduced material usage and improved stability
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 resulting polymeric structure effectively separates non-polar hydrocarbons from polar liquids, demonstrating improved stability and efficiency in oil removal, with increased adsorption capacity and reduced water adsorption, suitable for applications in produced water treatment and wastewater reuse.
Implementation Method 1
mixing graphene and at least one acid catalyst in a polar liquid in the presence of at least one alcohol to form an acid grafted graphene via an esterification reaction
Implementation Method 2
the acid grafted graphene and at least one styrene monomer are introduced to water in the presence of an initiator to form the adsorbent polymeric structure via an emulsion polymerization reaction. During the emulsion polymerization reaction, the initiator breaks a double bond of the acid grafted graphene to produce a reactive site
Implementation Method 3
allowing the at least one non-polar hydrocarbon from the polar liquid to be at least partially adsorbed by the adsorbent polymeric structure
Implementation Method 4
These materials should display the properties of both hydrophobicity and oleophilicity that assist in removing oil from water
Implementation Method 5
These materials should display the properties of both hydrophobicity and oleophilicity that assist in removing oil from water
Data Source
Figure 1
AI summary
Adsorbent polymeric structures are described. These adsorbent polymeric structures are capable of separating non-polar hydrocarbons, such as crude oil or diesel fuel, from polar liquids, such as water. The adsorbent polymeric structures may include acid grafted graphene and at least one styrene. A method of preparing an adsorbent polymeric structure according may include mixing graphene and at least one acid catalyst in a polar liquid in the presence of at least one alcohol to form an acid grafted graphene via an esterification reaction; and the acid grafted graphene and at least one styrene monomer are introduced to water in the presence of an initiator to form the adsorbent polymeric structure according to any of the previously-described embodiments via an emulsion polymerization reaction. Moreover, the adsorbent polymeric structures may be incorporated into methods of fluidly separating at least one non-polar hydrocarbon from a polar liquid.