Eureka/dye adsorption

Optimize Dye Adsorption Using Solar-Regenerated Adsorbents

Overview of Technical Issues:

The adsorbing structure insufficiently captures dye molecules from contaminated water, resulting in suboptimal purification rates, while the regenerating structure insufficiently restores adsorption capacity using solar energy after saturation, causing performance degradation over multiple treatment cycles and reducing the economic viability of the system; the goal is to enhance both the dye removal efficiency and the solar-driven regeneration effectiveness for sustainable, cost-effective wastewater treatment.

Problem Direction 1 :
ImproveActive surface area density
VS
ConstraintStructural strength
Inspiration 1 : Cross-domain reference
Application Principle: #1 Segmentation
Cross-domain Case Inspiration
This patent applies [Segmentation] by dividing the mask into metal and resin layers, improving pattern area density (analogous to active surface area) while preventing strength deterioration through the metal substrate. The resin layer maximizes functional area while the metal layer maintains structural integrity under handling stress, directly paralleling the current contradiction of increasing area of stationary object without compromising strength.
Vapor deposition mask with metal plate
Innovative Solution View detail
Modular honeycomb-cell adsorbent architecture with independent reinforced boundaries for high-density dye capture
Divide structure into modular honeycomb cells
How to solve :
  • Divide the adsorbent into independent hexagonal honeycomb cells (cell diameter 8–12 mm, wall thickness 0.8–1.2 mm) where each cell interior contains high-porosity activated carbon foam (porosity 75–85%, pore size 50–200 nm) providing 800–1200 m²/g surface area for dye adsorption, while thick cell walls made of polymer-ceramic composite (epoxy resin reinforced with 15–25 wt% alumina particles, compressive strength ≥25 MPa) bear flow pressure and handling loads
  • Fabricate via modular casting process: pour activated carbon slurry (carbon powder + polyurethane binder at 20:1 mass ratio) into pre-formed honeycomb molds at 60–80°C, cure for 4–6 hours, then coat cell walls with composite matrix via dip-coating (withdrawal speed 5–10 mm/s) and thermal cure at 120°C for 2 hours
  • Implement segmented load distribution where flow pressure (typically 0.1–0.5 MPa in wastewater systems) distributes across reinforced cell boundaries rather than fragile internal nanostructures, with quality control ensuring wall thickness tolerance ±0.1 mm (vernier caliper inspection), cell uniformity >95% (visual + dimensional check), and compressive strength ≥20 MPa (universal testing machine, 10 samples per batch)
Expected Effect : Surface area density 600–900 m²/L, compressive strength ≥20 MPa, flow resistance <0.3 MPa at 2 L/min, dye removal efficiency +40% vs monolithic structures
Risk Control :
  • cell wall thickness variation during casting
  • interface delamination between foam and composite wall
  • non-uniform carbon distribution in slurry
Inspiration 2 : Technology in this field
Search: Porous carbon materials, Mesoporous structures, Metal-organic frameworks, High surface area oxides, Hierarchical pore design
Existing SolutionView detail
Hierarchical Porous Carbon with Controlled Air Activation for Enhanced Dye Adsorption Surface Area
Biomass-derived hierarchical porous carbon with controlled air activation maximizes effective surface area while preserving structural strength
How to solve :
  • Apply two-stage air activation at 450°C for 30-60 min on pre-carbonized biomass (800°C pyrolysis) to achieve 550-670 m²/g BET surface area with hierarchical micro-meso-macropore structure
  • the macropores (>50 nm) provide structural skeleton and flow channels resisting collapse under 0.1-0.5 MPa pressure, mesopores (2-50 nm) enable rapid dye diffusion, and micropores (<2 nm) maximize adsorption density reaching 312.5 mg/g for methylene blue
  • Control activation temperature 400-500°C and time 30-90 min to balance surface area enhancement (260-580 m²/g range) with mechanical strength retention
  • oxygen functional groups (C-O, C=O, hydroxyl) introduced during air oxidation increase from baseline to 15-25% surface coverage, enhancing electrostatic attraction for cationic dyes while maintaining carbon framework integrity
  • Optimize particle size 63-125 μm and bulk density 7.5-25 lb/ft³ ensuring structural robustness during handling and flow operation while maximizing effective surface utilization
  • quality control includes compression strength testing (≥2 MPa), pore size distribution analysis (BJH method), and dye adsorption capacity verification (≥300 mg/g for MB)
Expected Effect : Surface area increased 54% to 580 m²/g; dye removal capacity 312.5 mg/g; structural strength maintained under flow pressure
Risk Control :
  • Activation uniformity across batch scale
  • balancing porosity with mechanical integrity
  • reproducible oxygen functionalization control
Problem Direction 2 :
ImprovePhotothermal conversion efficiency
VS
ConstraintManufacturing complexity
Inspiration 1 : Cross-domain reference
Application Principle: #26 Copying
Cross-domain Case Inspiration
This patent improves emission efficiency (energy use) by [copying the function through layered structures] using simpler blue fluorescent compounds instead of expensive phosphorescent materials, while maintaining ease of manufacture and reducing costs. It demonstrates how [replicating performance through multi-layer simple materials] resolves the contradiction between energy efficiency improvement and manufacturing complexity, directly echoing the current need to achieve high photothermal conversion without expensive specialized coatings.
Light-emitting element, light-emitting device, electronic device, and lighting device
Innovative Solution View detail
Multi-layer carbon-adsorbent composite with gradient photothermal zones for rapid solar regeneration
Replicate photothermal function via layered structure
How to solve :
  • Fabricate three-layer composite structure: top layer 0.3–0.5mm activated carbon felt (adsorption + inherent solar absorption), middle layer 0.2mm graphite sheet (concentrated photothermal conversion), bottom layer 1mm porous ceramic support (structural integrity + thermal insulation)
  • Apply simple dip-coating process: immerse ceramic support in activated carbon slurry (15–20 wt% solids), dry at 120°C for 2h, then laminate commercial graphite sheet between layers using water-glass binder (5 wt%), cure at 150°C for 1h
  • Design gradient absorption zones: graphite layer absorbs 75–85% incident solar radiation (peak at 500–1500nm), converts to heat conducted upward to desorb dyes from activated carbon, while ceramic base reflects transmitted IR back, achieving >80% total solar utilization without anti-reflective coatings
Expected Effect : Regeneration time 1–1.5h under 800 W/m² sunlight; photothermal efficiency 78–82%; manufacturing cost <$8/m²; cycle stability >90% after 60 cycles
Risk Control :
  • graphite-carbon interface delamination under thermal cycling
  • water-glass binder degradation in humid conditions
  • non-uniform graphite layer thickness affecting heat distribution
Inspiration 2 : Technology in this field
Search: Plasmonic nanostructures, Low-cost surface fabrication, Composite photothermal materials, Photothermal membrane systems, Full-spectrum absorbers
Existing SolutionView detail
Plasmonic Gold Nanoparticle-Enhanced Carbon Nanotube Photothermal Membrane for Rapid Solar Regeneration
Integrate plasmonic gold nanoparticles with carbon nanotubes to create dual-mechanism photothermal system
How to solve :
  • Disperse plasmonic gold nanoparticles (20-50 nm diameter) uniformly onto porous hydrophilic polymer substrate pre-coated with carbon nanotubes via vacuum filtration
  • gold nanoparticles provide localized surface plasmon resonance for visible light absorption (400-700 nm) while CNTs capture near-infrared spectrum (700-2500 nm), achieving broadband solar absorption >95%
  • Apply plasma surface treatment (oxygen plasma, 100W, 3 min) to enhance hydrophilicity and nanoparticle adhesion, ensuring photothermal conversion efficiency ≥90% at 1 sun intensity
  • Implement interfacial heating design where photothermal layer floats on water surface, concentrating heat at evaporation interface to reach 80-100°C within 60-90 minutes under 1 sun illumination, enabling thermal desorption of adsorbed dye molecules and restoring adsorption capacity to >92% of original performance
  • Quality control: measure solar absorptance via UV-Vis-NIR spectrophotometry (target >95% in 300-2500 nm range), verify photothermal efficiency by temperature monitoring (acceptance: ΔT ≥45°C in 30 min at 1 kW/m²), test regeneration cycles with methylene blue dye (criterion: <8% capacity loss after 50 cycles)
Expected Effect : Photothermal conversion efficiency 90-94%; regeneration time 60-90 minutes; capacity retention >92% after 50 cycles
Risk Control :
  • Gold nanoparticle aggregation during synthesis
  • uniform dispersion quality control across large membrane areas
  • cost management for gold usage in scalable production
Problem Direction 3 :
ImproveAdsorption-desorption cycle stability
VS
ConstraintManufacturing complexity
Inspiration 1 : Cross-domain reference
Application Principle: #11 Beforehand cushioning (Prior cushioning)
Cross-domain Case Inspiration
This patent improves reliability of fluid delivery through [beforehand cushioning] via redundant systems and pre-integrated protective features during manufacturing, preventing malfunction without complicating production. It demonstrates how pre-built protective mechanisms can enhance cycle stability while maintaining manufacturing simplicity, directly addressing the contradiction between reliability improvement and ease of manufacture.
Patch-sized fluid delivery systems and methods
Innovative Solution View detail
Pre-stabilized hierarchical adsorbent with thermal anchoring for durable dye removal cycles
Pre-stabilize adsorbent during synthesis
How to solve :
  • Perform controlled thermal pre-treatment at 280–320°C in air during initial fabrication to anchor functional groups and create stable oxygen-containing surface sites before first use, preventing degradation without post-cycle treatments
  • Incorporate 3–5 wt% silica sol binder during mixing stage to cross-link adsorbent particles, forming stable Si-O-C bonds that resist thermal stress during solar regeneration while using standard mixing equipment
  • Apply one-step dip-coating in 2 wt% polyvinyl alcohol solution followed by 120°C drying to create protective surface layer that prevents active site loss, using existing coating lines without vacuum or plasma systems
Expected Effect : >92% capacity retention after 60 cycles; manufacturing cost increase <15%; processing time +2 hours per batch
Risk Control :
  • thermal treatment uniformity deviation causing localized weak zones
  • binder concentration inconsistency affecting cross-linking density
  • PVA coating thickness variation impacting regeneration efficiency
Inspiration 2 : Technology in this field
Search: Cyclic stability testing and capacity retention, Composite adsorbent materials, Adsorbent regeneration and reusability, Hydrothermal and mechanical stability, Scalable synthesis methods
Existing SolutionView detail
Micro-Sized Anion Exchange Resin Composite with Photothermal-Enhanced Regeneration for Dye Adsorption
Employ micro-sized anion exchange resin particles as the core adsorbent to maximize dye capture through electrostatic attraction and ion exchange mechanisms, ensuring high initial adsorption capacity and abundant active sites
How to solve :
  • Synthesize micro-sized quaternary ammonium anion exchange resin particles (40-100 mesh) via suspension polymerization with divinylbenzene crosslinking (8-12% DVB content)
  • incorporate 5-10 wt% graphite powder or carbon black as photothermal conversion enhancer, achieving solar absorptivity >85% and thermal conductivity 3-5 W/(m·K)
  • implement humidity-assisted thermal regeneration at 60-80°C under 70-90% RH for 15-25 min, utilizing solar heating combined with water vapor to restore ion exchange sites and remove adsorbed dyes through combined thermal desorption and hydration displacement
  • conduct quality control via measuring adsorption capacity (≥0.35 g dye/g adsorbent), desorption efficiency (≥92% per cycle), particle size distribution (D50: 150-300 μm), and mechanical strength (≥95% integrity after 50 cycles)
Expected Effect : Capacity retention >93% after 50 cycles; regeneration time <30 min; manufacturing cost reduction 40%
Risk Control :
  • Resin particle uniformity and crosslinking density control
  • photothermal additive dispersion homogeneity
  • humidity control precision during solar regeneration
Problem Direction 4 :
ImproveSolar energy utilization rate
VS
ConstraintManufacturing complexity
Inspiration 1 : Cross-domain reference
Application Principle: #2 Taking out (Extraction)
Cross-domain Case Inspiration
This patent applies [extraction] by separating select devices from memory elements in a modular vertical architecture, improving energy efficiency (reducing leakage current losses) while simultaneously improving ease of manufacture (eliminating diodes, simplifying process). It directly mirrors the current contradiction of reducing energy loss without compromising manufacturing simplicity.
Architecture for a three-dimensional nonvolatile memory with vertical bit lines
Innovative Solution View detail
Dual-layer modular solar regeneration system with separated optical and thermal functions
Separate optical and thermal functions into two independent modules
How to solve :
  • Install a removable transparent cover module with micro-textured surface (pyramid height 2–5 μm, pitch 10 μm) above the adsorbent to reduce reflection to <4% without treating the adsorbent itself
  • Position a secondary absorber plate (low-cost graphite-coated aluminum, thickness 0.8 mm, thermal conductivity ≥200 W/(m·K)) beneath the adsorbent to capture transmitted solar radiation and conduct heat upward, converting energy loss into regeneration heating
  • Assemble modules via snap-fit mechanical joints without adhesives or coatings, enabling independent replacement and quality inspection of each layer
Expected Effect : Solar utilization rate ≥85%, regeneration time reduced to 1.5 hours, manufacturing cost +15% vs uncoated baseline
Risk Control :
  • cover-adsorbent air gap thermal resistance
  • secondary plate thermal contact uniformity
  • micro-texture replication consistency across batches
Inspiration 2 : Technology in this field
Search: Surface Texturing, Anti-Reflective Coating, Light Trapping Design, Nanostructure Integration, Graded Refractive Index
Existing SolutionView detail
Hierarchical Micro-Nano Dual-Scale Surface Texturing for Enhanced Solar Absorption
Combine micron-scale pyramid texturing with nanoscale surface structures to achieve broadband anti-reflection without coatings
How to solve :
  • Create micron-scale pyramidal base structures via alkaline etching (KOH 2-5 wt%, 80-90°C, 15-30 min) to reduce reflectance to ~12% at 600 nm through multiple internal reflections, then apply deep reactive ion etching (DRIE) using SF6/C4F8 gas cycles (SF6 etching 5-8 sec, C4F8 passivation 3-5 sec, 15-25 cycles) to form silicon nanotips (height 200-500 nm, density >10^8/cm²) on pyramid surfaces, achieving hierarchical light trapping
  • Control DRIE parameters: RF power 800-1200 W, chamber pressure 10-30 mTorr, substrate temperature 10-20°C to form scalloped nanostructures that create graded refractive index transition from air (n=1.0) through nanostructure layer (effective n=1.5-2.0) to bulk silicon (n=4.3), enabling <5% average reflectance across 300-900 nm spectrum without additional coatings
  • Quality control via SEM verification of pyramid angle 54.7°±2° and nanotip aspect ratio 3-5:1, spectrophotometry confirming weighted reflectance <6% over solar spectrum, ensuring enhanced solar absorption for rapid thermal regeneration of saturated adsorbent structures
Expected Effect : Reflectance reduced to <5% across 300-900nm; solar absorption efficiency increased by 40-50% versus single-scale texturing; regeneration time reduced by 35-45%
Risk Control :
  • DRIE process uniformity over large areas
  • nanotip mechanical durability under repeated wet-dry cycles
  • alkaline-DRIE sequential process integration
Problem Direction 5 :
ImproveActive surface area density
VS
ConstraintMust not deteriorate
Inspiration 1 : Cross-domain reference
Application Principle: #1 Segmentation
Cross-domain Case Inspiration
This patent applies [Segmentation] by dividing the vacuum tool system into a distributed multi-aperture zone (maximizing contact area for flexible material handling) and a refined fewer-aperture zone (providing precise control), improving functional area effectiveness while maintaining operational precision. This mirrors the current need to improve active surface area through porosity without compromising mechanical density for structural strength.
Hybrid pickup tool
Innovative Solution View detail
Radial-segmented adsorbent cartridge with dual-density zones for dye capture
Radial segmentation into functional zones
How to solve :
  • Divide the adsorbent cartridge into radial segments: inner core (80–90% porosity, activated carbon nanofibers, 800–1200 m²/g surface area) for dye adsorption, surrounded by outer shell (15–25% porosity, sintered ceramic or cross-linked polymer, compressive strength ≥15 MPa) for load-bearing
  • fabricate via coaxial extrusion or sequential molding, bonding interface with silane coupling agents at 120°C for 2 hours to ensure mechanical integration
  • design radial flow channels (0.5–1.0 mm diameter, spaced 5 mm apart) through the dense shell to allow contaminated water access to the porous core while the shell withstands flow pressure (up to 0.5 MPa) and handling stress
Expected Effect : Surface area density 750 m²/g, structural strength ≥12 MPa, dye removal efficiency +65% vs monolithic structures
Risk Control :
  • interface delamination under cyclic loading
  • flow channel clogging during operation
  • porosity gradient inconsistency in manufacturing
Inspiration 2 : Technology in this field
Search: Mesoporous carbon materials, High surface area activated carbon, Porosity-strength balance, Hierarchical porous structures, Surface area density optimization
Existing SolutionView detail
CVD-Strengthened Hierarchical Fibrous Carbon Substrate for High-Capacity Dye Adsorption
Construct hierarchical porous carbon substrate using vapor-grown carbon fibers with controlled porosity of 0.70-0.90 to maximize dye-accessible surface area
How to solve :
  • Fabricate substrate by dispersing vapor-grown carbon fibers (diameter 150 nm, aspect ratio 60) in gelable agar solution with surfactant, followed by freeze-drying to create open-pore network with porosity 0.85-0.95 and specific surface area 500-1200 m²/g
  • Apply CVD strengthening layer (0.5-3 μm thickness) of silicon carbide or alumina onto fiber surfaces and nodes at 600-800°C under inert atmosphere, increasing mechanical strength 3-5× while reducing porosity by only 5-10%
  • Optimize hierarchical pore structure with macropores (>50 nm) for rapid dye transport, mesopores (2-50 nm) for bulky dye molecule adsorption, achieving surface area density >2000 m²/cm³
Expected Effect : Adsorption capacity 400-500 mg/g for methylene blue; mechanical strength >3 MPa; porosity maintained at 0.80-0.88
Risk Control :
  • CVD coating uniformity in deep pores
  • thermal expansion mismatch between coating and fiber
  • scalability of freeze-drying and CVD processes for industrial volumes
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