OH-MIL-101 (Al) METALL-ORGANIC FRAMEWORK REAGENTRESEARCH GRADE MATERIAL
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This material exhibits thermal stability with decomposition onset above 350°C. It is chemically stable across a pH range of 3 to 12.
- Thermal Stability: Thermal decomposition onset exceeds 350°C.
- pH Stability: The material remains stable across a pH range of 3 to 12.
How does the hydroxyl functionalization in OH-MIL-101(Al) improve its catalytic and adsorption performance compared to pristine MIL-101(Al)?
The hydroxyl groups enhance hydrophilicity and active site accessibility, leading to a 95% Knoevenagel condensation yield versus 82% for pristine MIL-101(Al) and a 1.4x higher methylene blue adsorption capacity of 500 mg/g at 298 K. Additionally, the photocatalytic degradation rate for methyl orange reaches 0.22 min⁻¹ with 98% total degradation and 85% mineralization efficiency.
What are the pH and thermal stability limits of OH-MIL-101(Al) for use in aqueous or high-temperature reactions?
OH-MIL-101(Al) is chemically stable across a pH range of 3 to 12, making it suitable for mildly acidic to basic conditions. Its thermal decomposition onset is above 350°C, allowing operation in moderate-temperature catalytic and adsorption processes without structural degradation.
What is the regeneration capability of OH-MIL-101(Al) for repeated adsorption cycles?
The adsorbent exhibits excellent regenerability, with less than 7% capacity loss after 20 thermal regeneration cycles at 70°C. This indicates robust structural integrity and reusability for continuous flow purification or batch adsorption applications.
OH-MIL-101 (Al) is a hydroxyl-functionalized aluminum MOF with high BET surface area (2500-3000 m²/g) and mesoporous structure, offering superior catalytic and adsorption performance compared to pristine MIL-101(Al) in applications such as Knoevenagel condensation, heavy metal removal, and supercapacitor electrodes.
Positive
- High surface area and mesoporosity: BET specific surface area of 2500-3000 m²/g with 2-3 nm mesopores provides abundant active sites and rapid mass transport for catalytic and adsorption processes.
- Enhanced catalytic and adsorption performance: Hydroxyl functionalization yields 95% Knoevenagel conversion, 500 mg/g methylene blue uptake (1.4x pristine), and 120 mg/g As⁵⁺ adsorption with rapid equilibrium within 20 minutes.
Trade-offs
- Variable particle size and CAS: Particle size and CAS registry depend on customized batch profile, potentially affecting reproducibility in standardized protocols.
- Fine powder handling required: White powder form may necessitate dust control measures and careful storage to maintain stability and prevent contamination in sensitive applications.
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