Investigation of effectiveness of pine cone biochar activated with KOH for methyl orange adsorption and CO 2 capture
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ORIGINAL ARTICLE
Investigation of effectiveness of pine cone biochar activated with KOH for methyl orange adsorption and CO2 capture Nihan Kaya 1
&
Zeynep Yıldız Uzun 2
Received: 13 August 2020 / Revised: 24 September 2020 / Accepted: 2 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, pyrolysis of pine cone, a lignocellulosic biomass, was carried out in a fixed bed reactor. The biochar product obtained was activated by using chemical activation method. KOH was used as the activating agent with the impregnation ratio was ¼. Activated pine cone biochars were characterized by using analysis techniques such as SEM, BET, and FT-IR. The usage potential of the activated biochar product with a surface area of 1714.5 m2/g has been investigated in two different application areas. As the first application area, the CO2 holding capacity of activated biochar was measured by using the thermogravimetric analysis method. The CO2 adsorption capacity of the activated biochar was determined as 160 mg/g (3.64 mmol/g) at 25 °C. As a second application area, the effectiveness of activated biochar product in the removal of dyestuff (methyl orange) from aqueous solutions was investigated. The methyl orange adsorption capacity of the activated biochar in optimum conditions (pH 2, temperature of 25 °C, initial concentration of 100 mg/L, adsorbent amount 0.8 g/L) was calculated as 109.5 mg/g. Isotherm modeling and kinetic investigations showed that Freundlich and pseudo-second-order models describe the adsorption equilibrium and kinetic behavior well. As a result, this type of biomass could be successfully evaluated in removing both methyl orange dye, which is a potential pollution risk for aquatic environment, and CO2 that is responsible for climate change and greenhouse effect in the atmosphere. Keywords Pine cone . Activated biochar . Pyrolysis . Adsorption . CO2 capture . Methyl orange
1 Introduction In recent years, biochars have been accepted as an important tool to improve environmental management and provide energy production. Biochar is a material formed as a result of the carbonization of biomass containing carbon. The most common definition of biochar made so far is stated as a solid material obtained as a result of thermochemical transformations of biomass in an environment where oxygen is limited. These products are potential candidates for sustainable energy
* Nihan Kaya [email protected] Zeynep Yıldız Uzun [email protected] 1
Engineering Faculty, Department of Chemical Engineering, Hitit University, Çorum, Turkey
2
Boyabat Vocational School, Department of Chemistry and Chemical Processing Technologies, Sinop University, Sinop, Turkey
production and environmental management. Biochar products are produced depending on different operating conditions and process parameters as a result of thermochemical processes. Therefore, the products have different physical and chemical properties. Characterization of the biochar is very important as it plays an important
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