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Value of [R.sub.L] indicates whether the Langmuir adsorption isotherm will be unfavorable ([R.sub.L] > 1), linear ([R.sub.L] = 1), favorable (0 < [R.sub.L] < 1), or irreversible ([R.sub.L] = 0).
The adsorption isotherm of MB on the corallina elongata at room temperature is shown in Fig.
Fitted equation, correlation coefficients and [K.sub.1] and [K.sub.2] values, corresponding to the adsorption isotherm obtained from copper ions adsorption on calcined substrate Substrate Fitted equation r NAS [C.sub.eq]/x/m = 0.4850 + 230.31 [C.sub.eq] 0.9977 AS [C.sub.eq]/x/m = 0.5703 + 98.21 [C.sub.eq] 0.9868 Substrate [K.sub.1] [K.sub.2] NAS 474.86 0.0043 AS 172.20 0.0102 Table 2.- mmol of [H.sub.3][O.sup.+] ions produced during the adsorption reaction [Cu.sup.+2] M mmol [H.sup.+] 10 mL soln.
Adsorption isotherm is the study of adsorption equilibrium at given temperature.
Adsorption isotherms are basic requisites for understanding the adsorption process and indicate how the adsorbate is distribute between the liquid and solid phases when the process reaches equilibrium (HAMEED; DIN; AHMAD, 2007; MEZOHEGYI et al., 2012).
Caption: Figure 2: Adsorption isotherms for nitrate adsorption onto CGAC and Zn[Cl.sub.2]-modified CGAC: (a) experimental points; (b) Langmuir adsorption isotherm plots; (c) Freundlich adsorption isotherm plots; (d) Temkin adsorption isotherm plots.
For the adsorption isotherm experiments, different initial Cu(II) concentrations (0.5-200 mg [L.sup.-1]) were agitated with 1 g soil adsorbent in a thermostated rotary shaker at the speed of 180 rpm for 24 hours.
Adsorption of alkyl sulfate surfactants onto [gamma]-[Al.sub.2][O.sub.3] is discussed in detail based on the change in surface charge, the change in functional groups by FTIR, and the adsorption isotherm.
Adsorption is considered promising if value of [K.sub.F] is found in range of 1-20, and results reveal that in the present study, [K.sub.F] was 9.5 and 12.2, respectively, for linear and nonlinear approaches of Freundlich adsorption isotherm. Similarly, adsorption intensity represented by n indicates fitness of model for adsorption purposes if value of n is above 1.
Adsorption Isotherms. Freundlich [32], Langmuir [33], Temkin [34], and Dubinin-Radushkevich [35] models related to adsorption equilibrium are investigated as described in the literature to understand the nature and mode of adsorption.
Adsorption Isotherm. The adsorption process can be described using an adsorption isotherm.
The results obtained from the batch adsorption experiments conducted to study the effect of the initial dye concentration on dye adsorption were used to investigate the adsorption capacity of fly ash for reactive blue 25 dye through the well-known Langmuir and Freundlich adsorption isotherms.