Potassium Iodide KI Impregnated Activated Carbon-Heycarbons
What is Potassium Iodide KI Impregnated Activated Carbon?
Potassium iodide impregnated activated carbon is a functional material made by impregnating potassium iodide (KI) solution into activated carbon.
Activated carbon itself has a high specific surface area and rich pore structure, which can effectively adsorb impurities in gases and liquids.
After impregnation with potassium iodide, the activated carbon not only retains its original adsorption properties, but also increases the chemical adsorption capacity for specific gases (such as hydrogen sulfide, sulfur dioxide, etc.).
The main purpose of impregnating potassium iodide (KI) in activated carbon is to enhance the adsorption capacity of activated carbon for certain specific gases or pollutants, especially to improve its performance by chemical adsorption.
KI impregnated activated carbon is more active and has strong adsorption capacity. The working sulfur capacity of potassium iodide KI activated carbon is 1.5-2.5 times that of KOH impregnated activated carbon. But the price of KI impregnated activated carbon is high. So, sometimes customers choose KI+KOH combined impregnated activated carbon.
Why is the working sulfur capacity of KI activated carbon higher than that of KOH activated carbon?
The main reasons why KI impregnated activated carbon has a higher sulfur capacity than KOH impregnated activated carbon are as follows:
1. Promote chemical adsorption and oxidation
– KI can provide iodide ions (I⁻), which can catalyze the oxidation of sulfur dioxide (SO₂) to sulfate (SO₄²⁻) or elemental sulfur (S) during the adsorption process, thereby increasing the sulfur capacity.
– Although KOH also has a certain oxidation capacity, its main function is to provide an alkaline environment to dissolve SO₂ and form sulfite (SO₃²⁻), but the efficiency of conversion to sulfate is low.
2. Catalytic effect of iodine
– KI can form I₂/I⁻ redox pairs, enhancing the oxidation adsorption capacity of SO₂.
– This helps to convert more SO₂ into more stable sulfate or elemental sulfur, increasing the sulfur capacity.
– KOH adsorbs SO₂ only through alkalinity and cannot provide a similar catalytic effect.
3. Influence of functional groups on the surface of activated carbon
– KI can promote the uniform distribution of iodide on activated carbon, and may introduce more oxygen-containing functional groups (such as C=O, C-OH), further enhancing the adsorption and oxidation capacity of SO₂.
– Although KOH impregnation can increase the surface alkaline groups (such as -OH), its oxidizing property is not as good as KI, resulting in a weaker ability to adsorb SO₂.
4. Stability of reaction products
– Sulfate and elemental sulfur formed by KI are generally more stable and not easily desorbed, so the overall sulfur capacity is higher.
– After KOH adsorbs SO₂, the formed sulfite is more likely to be desorbed, resulting in a relatively low adsorption capacity.
Conclusion
On the whole, the higher sulfur capacity of KI-impregnated activated carbon is mainly attributed to the oxidation catalysis of iodine and the formation of more stable sulfides, while KOH mainly relies on alkaline neutralization and has a weaker oxidation ability, so the sulfur capacity is relatively low.
KI Impregnated Activated Carbon Production Process
Preparation: According to customer requirements, choose the appropriate based carbon. Dissolve water and potassium iodide KI solution in a certain proportion.
Impregnation: After the potassium iodide KI impregnation solution and activated carbon are prepared, the dissolved chemical solution is evenly sprayed on the activated carbon. This method replaces soaking, greatly improves production efficiency and reduces water content.
Heat release: Before packaging, the impregnated activated carbon is left at room temperature for about two days to release heat. This improves safety.
Potassium Iodide KI Impregnated Activated Carbon Reaction
Sulfur Dioxide SO₂ Removal
The principle of SO₂ adsorption by KI impregnated activated carbon is similar to that of SO₂ adsorption by KOH impregnated activated carbon. To learn more about the mechanism and application of SO₂ adsorption by KOH impregnated activated carbon, please click the link below:
KOH Impregnated Activated Carbon – Heycarb
But here, the chemical adsorption process of potassium iodide KI impregnated activated carbon to remove SO₂ mainly relies on redox reaction. KI, as a redox catalyst, reacts with SO₂ to form sulfate and releases iodine (I₂). Its main chemical reactions are as follows:
1. KI reacts with SO₂ to generate potassium sulfite and iodine
SO₂+2KI+H₂O→K₂SO₃+I₂+2H+
In this process, iodine ion (I⁻) is oxidized to elemental iodine (I₂), and SO₂ is converted to potassium sulfite (K₂SO₃).
2. In the presence of oxygen, potassium sulfite is oxidized to potassium sulfate
2K₂SO₃+O₂→2K₂SO₄
The oxygen in the air can further oxidize K₂SO₃ to more stable K₂SO₄.
KI mainly plays a catalytic oxidation role, improving the removal efficiency of SO₂, while iodine (I₂) can also be further adsorbed or recovered.
Hydrogen Sulfide H₂S Removal
In the process of removing H₂S (hydrogen sulfide) from activated carbon impregnated with KI (potassium iodide), redox reactions mainly occur. As a reducing gas, when H₂S reacts with KI, I⁻ is oxidized to elemental iodine (I₂), while H₂S is oxidized to elemental sulfur (S) or sulfate (such as K₂SO₄). The specific reactions are as follows:
1. H₂S reacts with KI to generate sulfur and iodine
H₂S+2KI→2KHS+I₂
In this process, H₂S is oxidized to hydrogen sulfide salt (KHS), while I⁻ in KI is oxidized to I₂.
2. Further oxidation to generate elemental sulfur
In a suitable oxidizing environment (such as O₂ in the air), H₂S will be further oxidized to generate elemental sulfur:
H₂S+I₂→2HI+S
This shows that H₂S can release elemental sulfur (S) under the action of KI, and I₂ may be adsorbed on the surface of activated carbon.
3. In the presence of oxygen, H₂S can be oxidized to sulfate
If oxygen is involved, H₂S can be further oxidized to potassium sulfate:
H₂S+4KI+2O₂+2H₂O→K₂SO4+4HI
This reaction shows that in an oxidizing environment, H₂S can be completely oxidized to potassium sulfate (K₂SO₄), thereby improving the removal efficiency.
Heycarbons KI Impregnated Activated Carbon Product
HEYEAC extruded activated carbon H2S removal series. The product is made of high-quality of anthracite as raw materials, kerosene binder, by milling, compounding, extrusion, carbonize and activation of activated carbon from the cylinder.
The activated carbon is exceptionally hard and resistant to mechanical breakdown resulting from a unique binding and extrusion process used during its manufacture.
We use a unique airflow carbonization method instead of burned it, which results in lower ash content and greater strength.
We also use special cooling equipment that does not require cooling on the ground, thus ensuring that the activated carbon does not fall to the ground during the entire process and will not be mixed with impurities.
This material has an extensively enhanced adsorption capacity for organic vapours coupled with high meso and macro porosity to ensure rapid diffusion of adsorbate to adsorption sites.
Heycarbons KI Impregnated Activated Carbon Features and Benefits
- Potassium iodide KI has high purity
- Use spray impregnation instead of soaking to make the impregnation uniform. It can prevent excessive impregnation from blocking the carbon pores and insufficient impregnation from reducing the sulfur capacity.
- Good adsorption capacity of H₂S
- Excellent SO₂ adsorption
- Low flow resistance
- High mechanical strength and durability
- Uniform particle size
- Low dust content, clean
- Low flammability
The specification of Heycarbons potassium iodide KI impregnated activated carbon is as follows:
| Specification of our HEYCARBONS brand – HEYEAC KI EXTRUDED SERIES | |
|---|---|
| Iodine value | 900-1100mg/g |
| CTC | 50-100% |
| Impregnation KI | 1-3 |
| Moisture | ﹤10%, ﹤15% |
| H2S working capacity | 0.15-0.3g/cc |
Heycarbons KI Impregnated Activated Carbon Customer Case-H₂S Removal
To remove H₂S, the customer used three types of impregnated activated carbon for testing:
- NaOH activated carbon: COCO GAC, 30-60mesh, 6-8% impregnation amount
- KI+KOH combined impregnated activated carbon: 6-8% impregnation amount
- KI impregnated activated carbon: 1.5-2% impregnation amount
The results show that the adsorption effect of the three impregnated activated carbons on SO2 is ranked as follows: KI impregnated activated carbon > KI + KOH combined impregnated activated carbon > NaOH impregnated activated carbon.
However, the price of KI-impregnated activated carbon is the highest, and the customer finally chose KI+KOH combined impregnated activated carbon from an economic perspective.
If you want to know more detailed test data, please contact heycarbons.
Heycarbons KI Impregnated Activated Carbon Customer Case-Iodine Removal
Potassium iodide activated carbon can be used in nuclear power plants to absorb iodine, especially radioactive iodine (such as ¹³¹I).
- Coconut shell activated carbon
- Iodine value: min 1200mg/g (before impregnation)
- 8-16 mesh
- Moisture<10%, <15%
Potassium Iodide KI Impregnated Activated Carbon Application
Sulfur Dioxide SO₂ Removal
1. Industrial waste gas treatment
- Coal-fired power plants: remove SO₂ from coal-fired flue gas to reduce the formation of acid rain.
- Metallurgical industry: purify SO₂-containing waste gas generated during smelting.
- Chemical production: remove SO₂ generated during chemical processes to prevent environmental pollution.
2. Air purification
- Indoor air purifier: used to remove SO₂ from indoor air and improve air quality.
- Industrial ventilation system: such as chemical plants, steel plants, etc., remove SO₂ to protect workers’ health.
3. Environmental protection
- Improvement of urban air quality: used to reduce the concentration of SO₂ in the atmosphere and alleviate the problem of acid rain.
- Ship exhaust treatment: remove SO₂ generated by ship fuel combustion in compliance with international environmental regulations.
Hydrogen Sulfide H₂S Removal
KI impregnated activated carbon is more active and has strong adsorption capacity. The adsorption capacity of KI (potassium iodide) activated carbon for H₂S is 1.5 times that of KOH impregnated activated carbon, but the price is high. Sometimes customers choose to impregnate activated carbon with KI and KOH.
Application scenarios
1. Industrial waste gas treatment
- Petroleum refining: Remove H₂S-containing waste gas generated during the refining process.
- Natural gas processing: Purify H₂S in natural gas to prevent pipeline corrosion and equipment damage.
- Sewage treatment plant: Remove H₂S generated during sewage treatment to improve air quality.
2. Air purification
- Indoor air purifier: Used to remove H₂S from indoor air and improve the living environment.
- Ventilation system in public places: Such as subway stations, underground parking lots, etc., to remove H₂S odor.
3. Environmental protection
- Landfill: Remove H₂S generated during landfilling to reduce odor pollution.
- Agricultural farms: Remove H₂S generated by the decomposition of livestock and poultry manure to improve the breeding environment.
If you want to know more information about impregnated activated carbon, please visit: Heycarb Impregnated Activated Carbon Manufacturer From China.
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