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https://sci.ldubgd.edu.ua/jspui/handle/123456789/6120| Title: | MICROWAVE-TREATED BENTONITE FOR REMOVAL OF LEAD FROM WASTEWATER |
| Authors: | Sysa, L.V. Stepova, K.V. Petrova, M.A. Kontsur, A.Z. |
| Keywords: | modified clays; bentonite; microwave treatment; adsorption isotherms; nonlinear modeling; lead removal. |
| Issue Date: | 2019 |
| Publisher: | Державний вищий навчальний заклад “Український державний хіміко-технологічний університет” |
| Series/Report no.: | Voprosy khimii i khimicheskoi tekhnologii; |
| Abstract: | Clay-based materials are promising adsorbents for removal of various pollutants from wastewater. This work is aimed to study the changes in structure and adsorption capacity of microwave-treated bentonite after adsorption of lead(II) ions. The structural investigation of the microwave-treated sample reveals that a partial destruction of silica skeleton takes place, and new surface nucleation centers are formed during microwave processing. The adsorption of Pb2+ on natural bentonite occurs on heterogeneous adsorption sites, whereas the removal of lead on microwave-treated sample is accompanied by the formation of plumbophyllite microcrystals. The natural and microwave-treated adsorbents were tested for lead adsorption in batch experiments. The results were fitted according to Langmuir, Freundlich, Toth, Redlich-Peterson, and Langmuir-Freundlich isotherms of adsorption. The microwave-treated samples revealed substantially higher efficiency towards the removal of lead, their maximal adsorption capacity was 114.7 mg g–1, whereas natural samples showed only 31 mg g–1. . |
| URI: | http://hdl.handle.net/123456789/6120 |
| ISSN: | 0321-4095 |
| Appears in Collections: | 2019 |
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