Physical Activated Carbon Powder
Overview
Physical activated carbon is produced by carbonizing organic materials (e.g., coconut shells, wood, or coal) followed by steam or CO₂ activation at 800-1000°C. Unlike chemical activation, this method avoids corrosive reagents, yielding a pure adsorbent with a well-developed pore structure. Its adsorption capacity stems from a vast network of micropores (1-2 nm) and mesopores (2-50 nm), providing surface areas exceeding 1000 m²/g in premium grades. The powder form (typically 200-400 mesh) maximizes contact efficiency in liquid-phase applications.
Physical and Chemical Properties
The material exhibits near-neutral pH (6-8) and low conductivity, making it suitable for sensitive processes like pharmaceutical purification. Its hardness (Mohs scale 2-3) minimizes attrition losses in flow systems. Thermal stability up to 300°C allows for reactivation via controlled oxidation. Key quality metrics include iodine number (mg/g, indicating micropore volume) and molasses decolorization index (reflects mesopore distribution). Ash content is typically <5% for food-grade variants.
Main Applications
In water treatment, it removes chlorine, organic contaminants, and taste/odor compounds at dosages of 10-50 mg/L. Industrial gas scrubbing utilizes fixed-bed reactors with 4x8 mesh granules for VOC abatement. The food industry employs it for decolorizing syrups and edible oils, where its chemical-free production meets FDA standards. Emerging uses include gold recovery in mining (CIP process) and electrode materials for supercapacitors.
Safety and Storage
Carbon dust poses explosion hazards at concentrations >50 g/m³; use anti-static equipment and grounding in processing areas. NFPA ratings: Health 1, Flammability 3, Reactivity 0. Store in sealed moisture-proof bags to prevent adsorption of atmospheric vapors. Incompatible with strong oxidizers like peroxides. Spent carbon may desorb contaminants; handle as hazardous waste if exposed to toxic substances.
B2B Procurement Guide
Specify parameters: iodine number (800+ for stringent applications), particle size distribution (D90 <50µm for rapid adsorption), and acid-washed variants for low-metal requirements. Bulk shipments (25-ton containers) reduce costs by 15-20% compared to bagged quantities. Verify supplier certifications (AWWA B604 for water treatment, USP-NF for pharmaceuticals). Pilot testing with actual process streams is recommended due to performance variability across feedstocks (coconut vs. coal-based).
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