Regenerable Nanoparticles for Dye Removal
Official patent title
Sulfer-doped silver tungstate (AG2WO4) nanoparticles for water decontamination
Arabic title: جسيمات نانوية من تنغستات الفضة (Ag2WO4) مطعّمة بالكبريت لإزالة تلوث المياه
Invention
Invention
Problem
Persistent dyes and other industrial pollutants can be difficult to remove from water, while existing adsorbents may have limited capacity, regeneration, or stability.
Why it matters
Reusable materials that capture dyes under defined pH, concentration, and contact conditions could support development of more controllable wastewater-polishing steps.
Approach
The method mixes sulfur-doped Ag2WO4 nanoparticles with pollutant-containing water, allows adsorption, and filters the mixture to collect a filtrate with less pollutant.
Who may benefit
Potential beneficiaries include industrial-water researchers, textile and dye-process developers, adsorbent manufacturers, environmental-materials laboratories, and wastewater-treatment equipment companies.
Potential value
The patent defines sulfur content, nanometer particle size, adsorption conditions, dye-removal measurements, and an acid-wash regeneration cycle in one treatment-material package.
Background
Background
Wastewater can contain dyes, pesticides, herbicides, ions, and other industrial or municipal pollutants. Biological treatment is often less effective for dyes that resist biodegradation, while physical and chemical methods include membrane filtration, coagulation, oxidation, and adsorption. Silver tungstate has optical and catalytic properties, but its low surface area and photodegradation can limit reuse in some configurations. The patent instead evaluates sulfur-doped Ag2WO4 nanoparticles as an adsorbent for indigo carmine and methyl red under varied pH, concentration, time, and regeneration conditions.
Technology overview
Technology overview
The claimed particles are spherical, 2–40 nm in average diameter, and contain 5–30 wt.% sulfur; XRD identifies an amorphous morphology. They are mixed with contaminated water at 20–40 °C and separated by filtration. Claims specify indigo-carmine adsorption capacities under acidic, near-neutral, and alkaline conditions, including at least 30 mg/g after 60 minutes at pH 6–8 for a 95–105 ppm feed. Regeneration uses 0.1 M HCl followed by water rinsing, with claimed indigo-carmine removal of at least 90% after three cycles.
Potential applications
Potential applications
- Potential use in treatment studies for dye-containing industrial wastewater.
- Potential use as a polishing adsorbent for indigo carmine or methyl red.
- Potential use in reusable nanoparticle sorbent development.
- Potential use in laboratory comparisons across pH and pollutant concentration.
Evidence-supported advantages
Evidence-supported advantages
- Defines sulfur loading and a narrow nanometer-scale particle-size range.
- Reports adsorption behavior across acidic, neutral, and alkaline conditions.
- Includes measured removal for two model dyes.
- Provides an acid-wash regeneration method and three-cycle performance claim.
Development stage
Development stage
Patent publication with reported laboratory adsorption and regeneration measurements; field treatment, water-safety validation, regulatory compliance, and commercialization were not established.
Commercial opportunity
Commercial opportunity
The adsorbent may support licensing or sponsored trials with industrial-water and materials companies. Scale-up requires testing in real wastewater, continuous-flow operation, regeneration life beyond three cycles, nanoparticle capture, silver and tungsten leaching, residual sulfur, ecotoxicity, sludge handling, acid consumption, competing solutes, treatment cost, and discharge compliance.
Patent classifications
Patent classifications
WIPO IPC
- C02F1/28Treatment of water, wastewater, sewage or sludge
- B01J20/06Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
- C02F101/30Treatment of water, wastewater, sewage or sludge
CPC
- B01J20/3475Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
- B01J20/28007Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
- B01J20/3085Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
- B01J20/28019Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
- B01J20/06Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
- B01J20/3071Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
- C02F1/288Treatment of water, wastewater, sewage or sludge
- B01J20/3433Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
- C02F2305/08Treatment of water, wastewater, sewage or sludge
- C02F1/281Treatment of water, wastewater, sewage or sludge
- C02F2303/16Treatment of water, wastewater, sewage or sludge
- C02F2101/308Treatment of water, wastewater, sewage or sludge
Inventors
Inventors
- First inventorMohamed Khairy Abdel Fattah Omran
- InventorMohamed Mokhtar Mohamed
- InventorSalah Ahmed Ibrahim Eid
- InventorBabiker Yagoub Elhadi Abdulkhair
Keywords
Keywords
- silver tungstate
- Ag2WO4
- sulfur doping
- nanoparticles
- water decontamination
- dye adsorption
- indigo carmine
- regeneration
Patent document and drawings
Patent document and drawings
The patent publication is mapped to this record. Patent drawings remain within that publication; no separately cleared public media package has been supplied.