I. What is Iodine Value in Activated Carbon?
The iodine value (mg/g) gauges the quantity of iodine absorbed per gram of activated carbon, usually ranging from 500 to 1200 mg/g. It shows:
- Micropore volume: Higher iodine value = higher micropore content.
- Adsorption capacity: Indicates how well PAC removes small molecular compounds.
- Purification efficiency: Critical for pollutants such as VOCs, dioxins, or organic impurities in water.
👉 In simple terms: the greater the iodine value, the higher the adsorption capacity.
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II. Typical Iodine Value Ranges of Powdered Activated Carbon
- 500–700 mg/g → Low-grade, often used for basic wastewater treatment.
- 800–900 mg/g → Medium-grade, widely applied in industrial water purification.
- 1000–1100 mg/g → High-grade, suitable for air purification and steel industry flue gas treatment.
- >1100 mg/g → Premium-grade, often used in food, pharmaceutical, or high-purity chemical applications.
III. How to Select the Right Iodine Value for Different Applications
4.1 Steelmaking & Flue Gas Treatment
In steel plants, PAC is injected into the flue gas stream to adsorb dioxins, mercury, and heavy metals.
- Recommended iodine value: 1000–1100 mg/g
- Why: Higher micropore volume ensures efficient capture of toxic compounds at high temperatures.
4.2 Industrial & Municipal Water Treatment
PAC is dosed into water treatment systems to remove organic pollutants, pesticides, and taste/odor compounds.
- Recommended iodine value: 800–1000 mg/g
- Why: Balanced adsorption efficiency with cost-effectiveness.
4.3 Food & Beverage Industry
Used for sugar decolorization, beverage purification, and flavor improvement.
- Recommended iodine value: 1000–1100 mg/g
- Why: High purity and high adsorption ensure removal of colorants and off-flavors without compromising product quality.
4.4 Pharmaceutical & Fine Chemicals
Activated carbon plays a role in decolorization, purification of intermediates, and impurity removal.
- Recommended iodine value: 1100–1200 mg/g
- Why: Maximum adsorption capacity and stringent quality control standards.
4.5 Gas Purification & VOC Control
For industries handling solvents, chemical vapors, or odorous gases, PAC provides quick adsorption.
- Recommended iodine value: 900–1100 mg/g
- Why: High iodine ensures efficient capture of low molecular weight VOCs.
activated-carbon-powder-application
5. Other Parameters to Consider Besides Iodine Value
While iodine value is important, it should not be the only selection criterion. Engineers and procurement teams should also evaluate:
- Moisture Content– Impacts storage and dosing efficiency.
- Ash Content– Lower ash ensures higher purity and less interference.
- pH Value– Determines suitability for specific industrial processes.
- Particle Size Distribution– Fine powders allow faster adsorption, but handling requires proper dosing systems.
6. Cost vs. Performance: Finding the Right Balance
Higher iodine value generally means better performance, but also higher price. The key is to match iodine value with application requirements:
- For bulk wastewater treatment, medium iodine value PAC may be the most economical.
- For high-stakes industries like pharmaceuticals or steel emission control, higher iodine PAC is worth the investment.
7. Conclusion
Choosing the right iodine value for powdered activated carbon is not just a technical specification — it directly impacts efficiency, compliance, and cost-effectiveness.
- Steelmaking → 1000–1100 mg/g
- Water treatment → 800–1000 mg/g
- Food & beverage → 1000–1100 mg/g
- Pharma & chemicals → 1100–1200 mg/g
When evaluating suppliers, always request a technical data sheet (TDS) and test performance under real operating conditions.
👉 The right PAC can help your business achieve cleaner production, regulatory compliance, and long-term sustainability.
