Impact of the oxygen functional group of nitric acid‑treated activated carbon on KOH activation reaction

다국어 초록 (Multilingual Abstract)

To prepare activated carbon with a high specific surface area, oxygen functional groups (OFGs) that can serve as useful electron donors during KOH activation were treated with nitric acid and incorporated into activated carbon. OFGs are incorporated differently according to the surface characteristics of starting materials. Up to 22.46% OFGs are incorporated into wood-based activated carbons (WACs), the C=O, COOH contents was 1.90, 17.05%, respectively. Whereas up to 12.82% OFGs are incorporated into coconut shell-based activated carbons, the C=O, COOH contents was 4.12, 6.15%, respectively. The OFGs used for increasing the specific surface area are the carbonyl group, and as the content of the functional group increases, the carbonyl group spreads to the carboxyl group. The specific surface area of activated carbons increased by 10–68% with an increase in the carbonyl group up to 6% (maximum point of carbonyl group). On the other hand, the specific surface area for WACs increased when the carboxyl group was 10% or below, but decreased by 6–15% when it increased to 10% or excess.

목차 (Table of Contents)

• Impact of the oxygen functional group of nitric acid-treated activated carbon on KOH activation reaction
• Abstract
• 1 Introduction
• 2 Materials and methods
• 2.1 Materials
• 2.2 Preparations of activated carbons by HNO3 treatment and KOH activation
• 2.3 Analysis of activated carbons treated with HNO3 and KOH activation
• 3 Results and consideration
• 3.1 Proximate analysis and elementary analysis of nitric acid-treated activated carbons
• 3.2 Functional group structure of nitric acid-treated activated carbons
• 3.3 Crystal structures and specific surface areas of activated carbons treated with HNO3
• 3.4 Specific surface area of activated carbons treated with KOH
• 4 Conclusion
• Acknowledgements
• References