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| Removal of Multiple Heavy Metals from Solution Using Natural Zeolite |
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Received:April 26, 2020
Revised:May 10, 2020
Accepted:May 11, 2020
Published Online:July 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.08.016 |
| KeyWord:natural zeolite; heavy metals; adsorption kinetics; adsorption isotherm; single adsorption; competitive adsorption |
| Author | Institution |
| Zhang Xiao |
江苏开放大学 环境生态学院 |
| Chen Gang |
江苏科技大学 环境与化学工程学院 |
| 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 Jin-nan |
南京大学盐城环保技术与工程研究院 |
| Wang Lei |
江苏科技大学 环境与化学工程学院 |
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| Abstract: |
| Natural zeolite was used as adsorbent to remove heavy metal ions. Macroscopic and microscopic characteristics of zeolite materials were characterized. Adsorption effect of single heavy metal and multiple heavy metals were investigated, and adsorption kinetics and adsorption isotherm characteristics were studied. The results show that heavy metals in solution could be successfully adsorbed by natural zeolite. The natural zeolite contains heulandite, cristobalite, quartz and kaolinite, and particles appear irregular shape with particle sizes of 0.189-129.3 μm, and their surfaces consist of some flake-like minerals, which main components are alumina-silicate minerals. The Zeta potential analysis shows that negative surface makes natural zeolite could efficiently adsorb heavy metals in solutions and sequence of adsorption ability is Pb>Cu>Cd>Zn. Higher solution pH value can promote adsorption process of heavy metals. The fast adsorption process of heavy metals on natural zeolite could complete within 50 min. The quasi-second-order kinetics is more suitable for fitting adsorption process of heavy metals on natural zeolites. Adsorption process of Cd is suitable to Langmuir adsorption isotherm and adsorption process of Pb, Cu and Zn is suitable to Freundlich adsorption isotherm. Under competitive adsorption system, competitive adsorption advantages of Pb and Cu are mainly reflected in higher natural zeolite dosage and the order of adsorption advantage is Pb>Cu>Cd > Zn. |
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