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| Establishment of Semi-empirical Modified Langmuir Adsorption Isotherm Equation and Its Application in Zeolite Adsorption of Heavy Metals |
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Received:November 11, 2019
Revised:December 11, 2019
Accepted:December 12, 2019
Published Online:March 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.04.017 |
| KeyWord:Langmuir; semi-empirical modified; adsorption isotherm; multivariate adsorption; heavy metal; zeolite |
| Author | Institution |
| ZHANG Xiao |
江苏开放大学 环境生态学院 |
| CHEN Chen |
江苏科技大学 环境与化学工程学院 |
| CHENG Ting |
江苏开放大学 环境生态学院 |
| WANG Jinnan |
南京大学盐城环保技术与工程研究院，南京大学环境学院 |
| YE Chenhao |
江苏科技大学 环境与化学工程学院 |
| DENG Qin |
江苏科技大学 环境与化学工程学院 |
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| Abstract: |
| Based on experimental data and classical Langmuir adsorption isotherm equation, transforming concept of traditional equilibrium adsorption capacity to equilibrium adsorption area and introducing concept of fictitious heavy metal ion and partition coefficient of equilibrium adsorption area, modified semi-experienced adsorption isotherm equation and adsorption data analysis method were successfully set up, which fit for analyzing multivariate adsorption process of heavy metal ions on zeolite with satisfactory results. According to hypothesis and fitting results, it is indicated that the maximum adsorption area sequence in unitary adsorption system is Ni>Cu>Pb>Cd. In any multivariate adsorption system, the total maximum adsorption area is lower than sum of maximum adsorption area of each heavy metal in unitary adsorption systems. Cu always occupies a prominent position among all heavy metals no matter high-low of initial concentration and keep steady with increase of initial concentration. Competitive edge of Pb is shown under the condition of high initial concentration and rises with increase of initial concentration. Relatively, competitive edges of Cd and Ni are obvious when the initial concentration is low and gradually drop with increase of initial concentration. |
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