Synthesis of zeolite A using raw kaolin from Ethiopia and its application in removal of Cr(III) from tannery wastewater
| Autor: | Yonas Chebude, Lijalem Ayele, Alvaro Mayoral, Eduardo Pérez, Isabel Díaz |
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| Rok vydání: | 2017 |
| Předmět: |
General Chemical Engineering
chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Raw material 01 natural sciences Inorganic Chemistry Crystallinity Chromium Adsorption Zeolite Waste Management and Disposal 0105 earth and related environmental sciences Waste management Renewable Energy Sustainability and the Environment Organic Chemistry 021001 nanoscience & nanotechnology Pulp and paper industry Pollution Fuel Technology Wastewater chemistry Sewage treatment 0210 nano-technology Clay minerals Biotechnology |
| Zdroj: | Journal of Chemical Technology & Biotechnology. 93:146-154 |
| ISSN: | 0268-2575 |
| DOI: | 10.1002/jctb.5334 |
| Popis: | BACKGROUND The commercial production of zeolite A mainly involves costly synthetic chemicals. However, cheaper raw materials such as clay minerals, coal ashes, natural zeolites, solid wastes and industrial sludge have been tested. Based on this, the objective of present study is synthesis of zeolite A from two sources of raw kaolins (Ansho and Bombowha) from Ethiopia and evaluation of its application in tannery wastewater treatment. RESULTS The synthesis result indicated high crystallinity (>90%) of zeolite A using Ansho kaolin. Lower grade Bombowha kaolin yielded zeolite A with crystallinity of 80%. In the tannery wastewater treatment study, a real sample having chromium concentration of 2036 mg/L was treated obtaining 99.8% removal and about 200 mg/g adsorption capacity of Cr(III) using 100 g/L and 5 g/L adsorbent dose respectively. This indicated that the synthesized zeolite A has a great potential in Cr(III) removal from tannery wastewater. CONCLUSION In this study, zeolite A has been synthesized from two sources of kaolin from Ethiopia and has been evaluated in tannery wastewater treatment. The synthesis result indicated the formation of crystals of zeolite A with optimum crystallinity of 91% and the material exhibited chromium removal efficiency of 99.8%. |
| Databáze: | OpenAIRE |
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