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铅（II）和镉（II）在商用活性炭上吸附的平衡、动力学及扩散机制

Equilibrium, Kinetic, and Diffusion Mechanism of lead(II) and cadmium(II) Adsorption onto Commercial Activated Carbons.

作者信息

Lach Joanna, Okoniewska Ewa

机构信息

Faculty of Infrastructure and Environment, Czestochowa University of Technology, Brzeznicka 60a, 42-200 Czestochowa, Poland.

出版信息

Molecules. 2024 May 21;29(11):2418. doi: 10.3390/molecules29112418.

DOI:10.3390/molecules29112418
PMID:38893296
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11174129/
Abstract

The adsorption of Pb(II) and Cd(II) on three commercial microporous activated carbons was analysed. Adsorption kinetics and statistics were investigated, and the results were described with different models. The highest values of the correlation coefficient R were obtained for the pseudo-second-order kinetics model for all ions tested and all sorbents used. The adsorption process was found to be determined by both diffusion in the liquid layer and intraparticle diffusion. The adsorption equilibrium is very well described by Langmuir, Temkin, Thoth or Jovanovic isotherm models. Based on the values of n from the Freundlich isotherm and K from the Langmuir isotherm, the adsorption of cadmium and lead ions was found to be favourable. The highest monolayer capacities were obtained during the adsorption of lead ions (162.19 mg/g) and for cadmium (126.34 mg/g) for activated carbon WG-12. This carbon is characterised by the highest amount of acid functional groups and the largest specific surface area. The adsorption efficiency of the tested ions from natural water is lower than that from a model solution made from deionised water. The lowest efficiencies are obtained when the process occurs from highly mineralised water.

摘要

分析了三种商用微孔活性炭对Pb(II)和Cd(II)的吸附情况。研究了吸附动力学和统计学，并使用不同模型描述结果。对于所有测试离子和所用吸附剂，伪二级动力学模型的相关系数R值最高。发现吸附过程由液膜扩散和颗粒内扩散共同决定。Langmuir、Temkin、Thoth或Jovanovic等温线模型能很好地描述吸附平衡。根据Freundlich等温线的n值和Langmuir等温线的K值，发现镉和铅离子的吸附是有利的。在活性炭WG - 12吸附铅离子（162.19 mg/g）和镉离子（126.34 mg/g）时获得了最高的单层容量。这种活性炭的特点是酸性官能团含量最高且比表面积最大。从天然水中吸附测试离子的效率低于从去离子水制成的模型溶液中的吸附效率。当过程从高矿化水中发生时，效率最低。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/ebfadba93562/molecules-29-02418-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/b820d4853ac4/molecules-29-02418-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/dc69fc064e3d/molecules-29-02418-g002a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/672326ec20e4/molecules-29-02418-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/ef2d97bca8f0/molecules-29-02418-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/4b28250999b8/molecules-29-02418-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/ccaff7d38de0/molecules-29-02418-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/4c732967414b/molecules-29-02418-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/37fe4b1f31bf/molecules-29-02418-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/ebfadba93562/molecules-29-02418-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/b820d4853ac4/molecules-29-02418-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/dc69fc064e3d/molecules-29-02418-g002a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/672326ec20e4/molecules-29-02418-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/ef2d97bca8f0/molecules-29-02418-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/4b28250999b8/molecules-29-02418-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/ccaff7d38de0/molecules-29-02418-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/4c732967414b/molecules-29-02418-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/37fe4b1f31bf/molecules-29-02418-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2882/11174129/ebfadba93562/molecules-29-02418-g009.jpg

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