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 Wysłany: Nie 14:24, 26 Gru 2010 Temat postu: UGG 激安 Adsorption of Phenol in Simulat |
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Adsorption of Phenol in Simulated Wastewater
K value of 27.509 at 0 ℃ was significantly greater than the k value of 11.341 at 60 ℃, the adsorption amount decreases with increasing temperature, consistent with the general absorption law that adsorption is an exothermic process, heat is not conducive to adsorption; the other hand, the solubility of phenol due to temperature changes have a significant impact on the adsorption j. Normal temperature,[link widoczny dla zalogowanych], low solubility of phenol in the ACF surface of the main absorption; 60 ℃, the phenol is almost completely miscible with water, solubility increases, the dominant desorption of phenol. Therefore, temperature is not conducive to adsorption, adsorption decreased. 2.2ACF compared with activated carbon and activated carbon at 20 ℃ ACF phenol adsorption isotherm shown in Figure 2. Friedrich Figure 220 ℃ isotherm obtained by linear regression Friedrich isotherm as ACF: q = kc '= 27.509c. -. Activated Carbon: q = kc = 16.296c \, 20 ℃ the adsorption 24h, visit ACF India Indian carp ∞ ∞ ∞ plus plus 0 .. Yu. ∞ I work _ \ No. 7 and Quantitative such as: Adsorption of Phenol in Simulated Wastewater dosage on the removal of 19 * rate effect, the results shown in Figure 3. l0o8060 basket 4o. 2OO00.10.20.30.40.50.60.7ACF dosage / g Figure 3ACF amount on the impact of removal from the Figure 3 shows, ACF amount 0.5g, the phenol removal rate can reach 99%, so the ACF to determine the best dosage of 0.5g. 2.4 ACF adsorption time of dosage of 0.5g, respectively, and 4o ℃ at 20 ℃ when the change the adsorption time to study the changes over time phenol removal, the results shown in Figure 4. l008060 \ flap 2OOO20406o8Ol00l2Ot/min Figure 4 removal rate versus time can be seen from Figure 4, 20 ℃ the adsorption 30min, 40 ℃ adsorption 25min, 9l% removal rate over time after removal with no significant increase, indicating that the ACF and its adsorption equilibrium; the higher the temperature, the faster the adsorption rate to achieve shorter adsorption equilibrium time . 2.5pH value of ACF dosage of 0.5g, 20 ℃, the use of HCI or NaOH adjusted pH, temperature oscillation 4h, investigated the impact of pH value on the removal, the results shown in Figure 5. \ 1i { Bu pH, Figure 5pH value on the removal rate can be seen from Figure 5, in acidic and neutral conditions,[link widoczny dla zalogowanych], the removal rate changed little,[link widoczny dla zalogowanych], to keep more than 97%; strong alkaline conditions, the rapid removal decline. This is because the weak acid phenol, and little solubility in acidic and neutral conditions, the phenol molecules to adsorption on the ACF-based; strong alkaline conditions, phenol molecules into the phenolate and increase the dissolved capacity, this time on the desorption of phenol-based ACF, so the removal rate dropped drastically. 2.6 Dynamic adsorption and activated carbon adsorption capacity of ACF in Table 2. can be seen from Table 2,[link widoczny dla zalogowanych], ACF after repeated regeneration, little change in adsorption capacity and adsorption capacity than activated carbon large ACF. Table 2ACF and activated carbon adsorption capacity 300025002ooo \ l500l0oo *. a -3-- a 7500O04OO800l200m water volume / mL Figure 6ACF and dynamic adsorption curves of activated carbon can also see from Figure 6 out quickly saturated adsorption breakthrough, ACF deal more water than carbon, showing a good adsorption performance. 3 Conclusion ACF and its adsorption properties, temperature is not conducive to adsorption, the adsorption capacity decreases; but l High temperatures reduce the time to reach adsorption equilibrium. ACF and adsorption amount of time there is an optimal value, in acidic and neutral conditions, the removal rate changed little; strong alkaline conditions, the phenol removal rate sharply, alkaline The stronger adsorption worse. isotherm and dynamic adsorption results show that, ACF is better than activated carbon adsorption. ACF after repeated regeneration, the adsorption capacity is almost does not change,[link widoczny dla zalogowanych], can be reused.
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