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机制研究 Cu²⁺/Pb²⁺ 在水相中通过矿物共改性生物炭的固定

Fei Jiang¹, Min Liu¹, Shuangjiang Li¹

¹College of Resources and Environment Science, Anhui Science and Technology University, Fengyang 233100, China.

Langmuir : the ACS journal of surfaces and colloids

|August 15, 2024

概括

改性生物炭与阿塔普尔吉特/二氧化有效吸附铜和等重金属. 这种具有成本效益的吸附剂在废水处理中表现出更好的性能,特别是在更高的pH水平下.

科学领域:

材料科学材料科学材料科学
环境科学环境科学
化学化学化学

背景情况:

生物炭改造显著提高了其对污染物的吸附能力.
开发高效和经济的吸附剂对于环境修复至关重要.

研究的目的:

准备和描述一种新的生物炭复合吸附剂 (MABC10%/MDBC10%),使用粉生物炭和阿塔普尔吉特/二氧化.
为了研究复合物的Cu2+和Pb2+离子的吸附性能和机制.

主要方法:

在没有溶剂的情况下进行单步球磨,以制备生物炭-attapulgite/diatomite复合材料.
表面特性,功能组和孔隙结构的表征.
吸附动力学,异热学研究和Cu2+/Pb2+去除的粒子扩散建模.

主要成果:

在生物炭上成功加载了attapulgite/diatomite,增加了C/O功能组和孔径大小.
Cu2+和Pb2+的吸附是在多层化学吸附之后发生的,其容量高达65.20 mg·L−1 (Cu2+) 和82.63 mg·L−1 (Pb2+).
吸附是通过表面速度限制和边界层扩散来控制的;更高的pH值提高了性能.

结论:

与未经修改的生物炭相比,MABC10%对重金属具有显著的协同吸附效应.
复合吸附剂在废水处理中具有经济性和有效性.
关键的吸附机制包括孔隙扩散,C/O功能组,静电相互作用和离子交换.

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