TAILIEUCHUNG - Thermodynamics Interaction Studies Solids, Liquids and Gases 2011 Part 16

Tham khảo tài liệu 'thermodynamics interaction studies solids, liquids and gases 2011 part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 740 Thermodynamics - Interaction Studies - Solids Liquids and Gases between the adsorbate for example Fe3 ions as it moves from the bulk solution towards the adsorbent surface for example natural zeolite 19 . For example the effect of contact time on sorption of Fe3 ions is shown in Figure 3. At the initial stage the rate of removal of Fe3 ions using natural quartz NQ and natural bentonite NB is higher with uncontrolled rate. The initial faster rate may be due to the availability of the uncovered surface area of the adsorbent such as NQ and NB initially 20 . This is because the adsorption kinetics depends on i the surface area of the adsorbent ii the nature and concentration of the surface groups active sites which are responsible for interaction with the Fe3 ions. Therefore the adsorption mechanism on both adsorbent has uncontrolled rate during the first 10 minutes where the maximum adsorption is achieved. Afterward at the later stages there is no influence for increasing the contact time. This is due to the decreased or lesser number of active sites. Similar results have been shown in our results using zeolite and olive cake as well as other reported in literatures for the removal of dyes organic acids and metal ions by various adsorbents 19 21 . t min. Fig. 3. Adsorption of Fe3 ions onto olive cake. Variation of the Fe3 ions concentration with time. Initial concentration of Fe3 ions 100 ppm Agitation speed 100 rpm pH temperature 28 C . Solubility of adsorbent heavy metals in wastewater water The slightly soluble metal ions in water will be more easily removed from water . adsorbed than substances with high solubility. Also non-polar substances will be more easily removed than polar substances since the latter have a greater affinity for adsorption. Affinity of the solute for the adsorbent If the surface of adsorbent is slightly polar the non-polar substances will be more easily picked up by the adsorbent than polar ones the opposite is correct . .

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