从酸性矿井排水 (AMD) 获得铜 (II) 的批量和连续固定床吸附,使用来自纤维素微晶 (CMC) 的绿色和可回收吸附剂
Musamba Banza1, Tumisang Seodigeng1, Sibali Linda2
1Department of Chemical and Metallurgical Engineering, Vaal University of Technology, Vanderbijlpark, South Africa.
概括
化学修饰的纤维素微晶 (CMCs) 有效地从水中去除重金属离子. 这项研究优化了吸附条件,达到258.09毫克/克的高容量,证明了可行的,低成本的水处理解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
- 纳米技术 纳米技术
背景情况:
- 开发简单,低成本的水处理方法对于去除重金属离子至关重要.
- 有机,可生物降解的聚合物,如纳米材料改性纤维素微晶 (CMCs),提供了一个可持续的解决方案.
- 工业应用需要在静态和动态过程中使用高效的吸附剂.
研究的目的:
- 研究化学改性CMC作为重金属离子去除吸附剂的有效性.
- 使用柱式技术,优化运行参数以达到最大吸附能力.
- 为了阐明吸附机制和热力学行为.
主要方法:
- 利用柱式技术研究pH值,床深度,度和流速的影响.
- 在各种输入度 (20-120毫克L-1) 和流速 (5-20毫升min-1) 的评估吸附能力.
- 使用FTIR,SEM和TGA对化学修饰的CMC吸附剂进行了表征.
主要成果:
- 在pH6下达到258.09±0.96 mgg-1的最佳吸附能力,初始度为200 mg L-1,接触时间为300分钟,剂量为5 g/200 mL.
- 吸附能力随着床深和初始度的增加而增加,但随着流速的增加而下降.
- 兰迈尔模型最好地描述了吸附,而伪二阶动力学表明了混合的物理吸附-化学吸附机制. 吸附是外热的和自发的.
结论:
- 化学改性CMC是工业重金属离子去除的高效和可行的材料.
- 该研究确定了在动态过程中最大限度地提高吸附效率的最佳条件.
- 吸附剂的性能与已建立的吸附模型保持一致,证实了其在水处理创新方面的潜力.
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