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从枣树废物中优化纳米多孔活性碳的合成,以增强CO2捕获

Ebrahim H Al-Ghurabi¹, Mourad M Boumaza¹, Waheed Al-Masry¹

¹Department of Chemical Engineering, College of Engineering, King Saud University, 12372, Riyadh, Saudi Arabia.

Scientific reports

|May 17, 2025

概括

用枣树叶片制造活性炭 (AC) 以有效捕获二氧化碳 (CO2). 优化的合成条件产生了具有优越二氧化碳吸收的AC,证明了其对可持续碳捕获应用的潜力.

科学领域:

材料科学材料科学材料科学
环境科学环境科学
化学工程是化学工程的重要组成部分.

背景情况:

优化工艺参数对于开发有效的碳酸吸附剂至关重要.
从生物质中提取的活性碳 (AC) 提供了碳捕获的可持续途径.
枣树叶片呈现出丰富而未充分利用的前体材料.

研究的目的:

从枣树叶片中合成高度纳米孔的活性炭 (AC),以增强二氧化碳 (CO2) 捕获.
系统地调查和优化影响CO2吸附的AC合成的关键过程参数.
评估合成的AC在各种条件下的性能,并评估其工业应用的潜力.

主要方法:

通过系统变化的热解温度,停留时间和KOH与碳 (KOH/C) 浸比率,合成了二十多个交流样本.
利用响应表面方法 (RSM) 进行结构化流程优化.
使用N2吸附异热体,元素分析,SEM和FTIR对交流电的特性进行表征.
在0°C和25°C时对二氧化碳吸附能力的评估以及在多个吸附-脱附周期中的稳定性.

主要成果:

在最佳的合成条件下 (700°C,1.5小时,3:1KOH/C比) 产生了具有特殊CO2吸收能力的交流电 (在0°C时6.71mmol/g,在25°C时4.214mmol/g).
优化的AC表现出高度发达的纳米孔状结构和高含量,有助于其卓越的性能.
吸附的高同位素度 (35kJ/mol) 表明在有利的纳米孔位点有偏好的CO2吸附.
合成的AC在多个吸附-脱附周期中表现出极好的稳定性.

结论:

枣树叶片是生产高效活性碳以捕获二氧化碳的可行和可持续的前体.
在这项研究中合成的优化AC在二氧化碳吸收方面优于之前报告的许多生物质衍生AC.
这些发现强调了定制合成策略的潜力,如RSM,用于开发先进的碳吸附剂.

关键词:

活性炭是一种活性炭.生物质价值化生物质价值化捕获二氧化碳的方法枣树的传单枣树的传单激活KOH的激活方式在 RSM RSM 中.

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