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在颗粒生物炭中Pb (II) 吸附的动力学和建模,基于微计算机断层扫描的特征表征

Hehu Zhang¹, Weizheng Zhong¹, Rongbin Qiu¹

¹Engineering Laboratory for AgroBiomass Recycling & Valorizing, College of Engineering, China Agricultural University, Box 191, Beijing 100083, China.

Bioresource technology

|August 9, 2023

概括

小麦生物炭有效地从水中去除 (II). 先进的微型计算机断层扫描 (micro-CT) 可视化了吸附,揭示了功率函数关系,并使改进的动力模型能够更好地解释机制.

科学领域:

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

背景情况:

生物炭是一种具有成本效益的吸附剂,用于从水溶液中去除重金属.
从水中去除 (II) 对于环境保护至关重要.
了解吸附动力学是优化生物炭性能的关键.

研究的目的:

用微型计算机断层扫描 (micro-CT) 来研究小麦上的 (II) 吸附动力学.
为了可视化生物炭上吸附的动态变化.
开发和验证修改的吸附动力学模型.

主要方法:

使用先进的微型计算机断层扫描 (micro-CT) 系统直接可视化小麦生物炭中的Pb (II).
分析了正常化的数字图像,以追踪动态Pb (II) 吸附变化.
应用时间依赖常数的修改后伪第一阶 (PFO) 和伪第二阶 (PSO) 模型.

主要成果:

图像灰度尺度在吸附时间上的变化遵循功率函数:GS_e/GS_t=2.45t^-0.27.
修改后的PFO和PSO模型提供了对吸附机制的更好的解释.
微CT可视化提供了直接的,基于证据的关于吸附动态的见解.

结论:

微CT是可视化和理解生物炭重金属吸附的强大工具.
开发的依赖时间的动力学模型增强了对吸附机制的解释.
这种新的方法为环境修复研究提供了有价值的见解.

关键词:

吸附可视化的吸附可视化动力学建模动力学建模微型CT技术的使用伪第一阶层.伪第二阶层.

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