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Investigation of effectiveness of pine cone biochar activated with KOH for methyl orange adsorption and CO 2 capture
Biomass Conversion and Biorefinery ( IF 4 ) Pub Date : 2020-10-12 , DOI: 10.1007/s13399-020-01063-8
Nihan Kaya , Zeynep Yıldız Uzun

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.



中文翻译:

KOH活化的松果生物炭对甲基橙吸附和CO 2捕集的有效性研究

在这项研究中,在固定床反应器中进行了木质纤维素生物素松果的热解。通过使用化学活化方法将获得的生物炭产物活化。使用KOH作为活化剂,浸渍率为1/4。通过使用诸如SEM,BET和FT-IR等分析技术来表征活化的松果生物炭。在两个不同的应用领域中,对表面积为1714.5 m 2 / g的活化生物炭产品的使用潜力进行了研究。作为第一应用领域,通过热重分析法测定了活性生物炭的CO 2保持能力。一氧化碳2在25°C下,活化的生物炭的吸附容量确定为160 mg / g(3.64 mmol / g)。作为第二应用领域,研究了活化的生物炭产品在从水溶液中去除染料(甲基橙)的有效性。在最佳条件下(pH 2,温度为25°C,初始浓度为100 mg / L,吸附剂量为0.8 g / L),活化的生物炭的甲基橙吸附容量经计算为109.5 mg / g。等温线模型和动力学研究表明,Freundlich模型和拟二阶模型很好地描述了吸附平衡和动力学行为。结果,可以成功评估这种类型的生物质,以去除对水生环境有潜在污染风险的甲基橙染料和CO 2。 这是造成气候变化和大气中温室效应的原因。

更新日期:2020-10-12
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