Removal of Heavy Metals from Drinking Water Using Chikni Mitti (Kaolinite): Isotherm and Kinetics
| Autor: | Muhammad Irfan Jalees, Sadia Asghar, Muhammad Umar Farooq, Sarosh Basheer |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Arabian Journal for Science and Engineering. 44:6351-6359 |
| ISSN: | 2191-4281 2193-567X |
| DOI: | 10.1007/s13369-019-03722-z |
| Popis: | Heavy metals in drinking water can cause adverse health effects. This study deals with the removal of heavy meals, i.e. $$\hbox {Pb}^{+2}$$ , $$\hbox {Ni}^{+2}$$ , $$\hbox {Cd}^{+2}$$ and $$\hbox {Cr}^{+6}$$ using locally available Chikni Mitti (Kaolinite). This natural adsorbent was used after grinding and without doing any kind of chemical modification. Optimum conditions including pH, concentration of Chikni Mitti, contact time, and agitation speed were established on experimental basis. Under these optimum conditions, 19.33 mg of $$\hbox {Pb}^{+2}$$ , 16.46 mg of $$\hbox {Ni}^{+2}$$ , 29.16 mg of $$\hbox {Cd}^{+2}$$ and 37.64 mg of $$\hbox {Cr}^{+6}$$ were removed per gram of Chikni Mitti used. Langmuir, Freundlich, Temkin, Dubinin–Raduskevich (D–R) and Flory Huggins isotherm models were found applicable on experimental data. Freundlich isotherm fitted best for the adsorption of $$\hbox {Cr}^{+6}$$ , $$\hbox {Cd}^{+2}$$ and $$\hbox {Pb}^{+2}$$ whereas for $$\hbox {Ni}^{+2}$$ , both Freundlich and Temkin fitted well. Kinetics of adsorption of $$\hbox {Pb}^{+2}$$ , $$\hbox {Ni}^{+2}$$ , $$\hbox {Cd}^{+2}$$ and $$\hbox {Cr}^{+6}$$ were found to follow second-order kinetics. |
| Databáze: | OpenAIRE |
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