Fig. 2. Effect of adsorbent dose on zinc ion removal for ethylenediaminetetraacetic acid-modified and unmo-dified bentonites.
Fig. 3. Effect of (a) mixing intensity and (b) contact time on zinc ion removal for ethylenediaminetetraacetic acid-modified and unmodified bentonites.
Fig. 4. Effect of pH on zinc ion removal for ethylenedi-aminetetraacetic acid-modified and unmodified bentonites.
Fig. 5. Effect of temperature on zinc ion removal for ethylenediaminetetraacetic acid-modified and unmodified bentonites.
Fig. 6. Langmuir and Freundlich isotherms of zinc ion removal for ethylenediaminetetraacetic acid-modified bentonite.
Fig. 7. Pseudo-second order kinetics of zinc ion onto ethylenediaminetetraacetic-modified and unmodified bentonites.
Fig. 1. (a) Images of field emission scanning electron microscope and (b) fourier transform infrared spectroscopy analysis of ethylenediaminetetraacetic acid-modified and unmodified bentonites.
Table 1. Equilibrium constants and thermodynamic parameters, in adsorption process for ethylenediaminetetraacetic-modified and unmodified bentonites
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