US 12453953 B1Patent grantUnited States

Oxide Adsorbent for Antibiotics and Dyes

Official patent title

Co2O3—Bi2O3@SiO2 nanocomposite and method of preparation thereof

Arabic title: مركب نانوي من Co.SUB.2.O.SUB.3.—Bi.SUB.2.O.SUB.3.@SiO.SUB.2 وطريقة تحضيره

Invention

Problem

Antibiotics and dyes can pass through conventional wastewater treatment and persist in receiving waters. An adsorbent needs sufficient capacity, accessible porosity, stability, regeneration, and low secondary contamination.

Why it matters

Removing pharmaceutical and dye micropollutants could reduce ecological exposure and contamination of water resources used by communities and agriculture.

Approach

The nanocomposite combines Co2O3 and Bi2O3 with a silica support in 10–30 nm granular particles and is designed as a high-surface-area adsorbent for ciprofloxacin and selected dyes.

Who may benefit

Potential beneficiaries include wastewater-treatment companies, pharmaceutical and textile plants, environmental laboratories, adsorbent manufacturers, and water-reuse operators.

Potential value

The disclosure reports at least 70 m²/g BET area and adsorption capacities of at least 70 mg/g for ciprofloxacin, 75 mg/g for indigo carmine, and 190 mg/g for fuchsin in claimed embodiments.

Background

Trace antibiotics and synthetic dyes enter water from agriculture, pharmaceutical use, hospitals, and manufacturing. Conventional biological treatment may not fully remove these molecules. Porous metal-oxide composites can adsorb pollutants and sometimes provide photocatalytic functions, while silica can increase dispersion and surface area. Practical treatment nevertheless depends on equilibrium and dynamic capacity, kinetics, selectivity, regeneration, metal leaching, and safe disposal. The disclosed cobalt-bismuth-silica material focuses on nanoscale morphology and reported adsorption capacity for representative compounds.

Technology overview

The Co2O3—Bi2O3@SiO2 particles have a claimed 10–30 nm granular diameter, BET area of at least 70 m²/g, 4–10 nm pores, and at least 0.060 cm³/g pore volume. Preparation separately treats bismuth nitrate in nitric acid, cobalt nitrate in ammonia, and fumed silica with fructose, then combines the mixtures at 190 °C, dries at 150 °C, mills, and calcines at 400–500 °C for 4–6 hours. Adsorption capacities are specified for ciprofloxacin, indigo carmine, and fuchsin.

Potential applications

Antibiotic removal from wastewater.
Dye adsorption in textile effluent.
Water-reuse polishing media.
High-surface-area adsorbent research.

Evidence-supported advantages

Provides high claimed BET surface area.
Targets an antibiotic and multiple dyes.
Uses nanoscale granular particles with mesopores.
Reports compound-specific adsorption capacities.
Provides a defined multi-step preparation route.

Development stage

Laboratory synthesis, porosity and morphology characterization, and claimed adsorption capacities are described; dynamic-column performance, real-water selectivity, metal leaching, regeneration, and reuse were not established. The development stage was not independently verified.

Commercial opportunity

The material could be evaluated for tertiary wastewater polishing. Commercialization needs full isotherms and kinetics, column breakthrough, real-effluent and competing-solute tests, cobalt and bismuth leaching, adsorbent separation, regeneration cycles, spent-media classification, ecotoxicity, batch consistency, precursor and calcination economics, and comparison with activated carbon and other commercial media.

Patent classifications

WIPO IPC

B01J20/10Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/28Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus

CPC

B01J20/28007Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/28064Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/28076Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/28061Chemical 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
B01J20/3078Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/28059Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/103Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/28071Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/28066Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/305Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/3021Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/28083Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J20/28073Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J2220/42Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus
B01J2220/4806Chemical or physical processes, e.g. catalysis or colloid chemistry; their relevant apparatus

Inventors

First inventorMutaz Ezzeldien Salih Amin
InventorRasmiah Saad Almufarij
InventorBabiker Yagoub Elhadi Abdulkhair

Keywords

ciprofloxacin adsorption
dye removal
cobalt oxide
bismuth oxide
silica
nanocomposite
wastewater treatment
mesoporous adsorbent

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.