Kinetic and Equilibrium Studies of Coomassie Blue G-250 Adsorption on Apricot Stone Activated Carbon
Received Date: Dec 23, 2014 / Accepted Date: Jan 18, 2015 / Published Date: Jan 24, 2015
The preparation of Activated Carbon from Apricot Stone (ASAC) with H3PO4 and its ability to remove the Coomassie Blue (CB) used in textile industry from aqueous solutions are reported in this study. The FTIR spectroscopy is used to get information on interactions between the adsorbent and CB. A series of contact time experiments were undertaken in stirred batch adsorber to assess the effect of the system variables. The results were discussed and showed that ASAC can be used in the wastewater treatment. A comparison of two models on the overall adsorption rate showed that the kinetic of adsorption was better described by the pseudo-second order model. The adsorption isotherms of CB onto ASAC are determined and correlated with common isotherms equations. The smaller RMSE values obtained for the Freundlich model indicate the better curve fitting; the monolayer adsorption capacity of CB is found to be 10.09 mg/g at temperature 22.5 °C and 98.022 mg/g at temperature 50 °C and pH ~ 2. The thermodynamic parameters indicate the spontaneous and exothermic nature of the adsorption process. The positive value of the entropy (ΔS) clearly that the randomness in decreased at the solid-solution interface during the CB adsorption onto ASAC, indicating that some structural exchange may occur among the active sites of the adsorbent and the ions. The activation energy (66.161 kJ/ mol) indicates that the chemical adsorption was predominant.
Keywords: Apricot stone; Coomassie Blue G-250; Kinetic; Isotherm; Thermodynamic
The dye production plants and many other industries which utilize dyes are increasing globally by the day with advancement in technology [1-3]. Textile, leather, paper, plastic, food, cosmetics, etc. are some of these industries. Presently, it was estimated that about 100000 of different commercial dyes and pigments exist and over 7.105 tones are produced annually worldwide [4,5]. As a result, the water pollution by dyes has become one of the major pollution sources with approximately over 40000 tones of dyes released every year into the environment [5,6]. Furthermore, most dyes are resistant to heat and light and are not biodegradable . Their presence in wastewater causes the water pollution by lowering light penetration and in this way the photosynthesis . Hence, the removal of dyes from waste effluents has become environmentally important. Various processes have been investigated and found to be effective in reducing dye concentrations in wastewaters like the chemical oxidation, biological treatment, coagulation-flocculation, membrane processes, adsorption, etc. [7,8]. Among these methods, the adsorption onto activated carbon has been found to be superior, inexpensive and effective to treat many dyes in wastewaters [5,7,8]. The high adsorption capacity of activated carbon is a result of a high surface area, extensive porosity in the interior of the particles, and presence of many different types of surface functional groups . However, the available activated carbons in commerce are relatively expensive; their production and regeneration cost may constitute their limiting factors . Hence, most researchers worldwide have focused on the search of new low-cost precursors especially issued from agricultural wastes. The precursors from wastes and agricultural by-products such as dolomite , date stones , waste bamboo scaffolding , Wheat Bran , bagasse  and flamboyant Pods  have shown a great absorption potential. The objective of the present study was to use apricot stones as a low-cost precursor since agriculture in Algeria generates more than 20.000 tones of apricot stones each year, and represents a significant amount of solid pollutant. The aim of the study was to assess the ability of activated carbon prepared from apricot stones for the removal of Coomassie blue (G-250), an acid dye largely used in the textile industry and biology and biochemistry for staining proteins . The study was carried out with the aim to optimize the conditions for maximum removal of this dye from aqueous solutions. Besides this, the equilibrium adsorption data were fitted to various models to obtain constants related to the adsorption process. Finally, the thermodynamic and kinetic studies were performed in order to estimate the rate of adsorption in parallel with the activation energy and changes in the free energy, enthalpy and entropy.
Materials and methods
Analytical grade reagents are used in all experiments. Acid dye, CB (99 %) is purchased from Merck Company. The chemical structure and properties of CB are listed in Table 1. Apricot stones obtained from Boumerdes region in Algeria, are air-dried, crushed and screened to obtain two fractions with geometrical mean sizes ranging from 63 to 2.5 mm. 100 g of the selected fraction are impregnated with concentrated H3PO4 (85 %) and dried in air. Then, it is activated in a hot air oven at 250°C (4 h). The carbonized material is washed with distilled water to remove the free acid until the pH reaches 6.8 and dried at 105°C. The clean biomass is mechanically ground and sifted to get a powder of different particle sizes: < 63, [63-80], [80-100], [100-200], [200- 315], [315-800] μm and [0.8-1], [1-1.6], [1.6-2] mm. Table 2 gives the physical and chemical properties of the Apricot Stones Activated Carbon (ASAC).
|Molecular weight||(855.028 ± 0.054) g/mol|
|Density||(0.96 ± 0.05) g/mL|
|Wave number (λmax)||595 nm|
|Refractive index||(1.334 ± 0.124)|
|Name||Coomassie Brilliant Blue (G-250)|
Table 1: Chemical properties of acid dye, Coomassie Blue (G-250)
|Elemental analysis (%)|
|pHzpc||(7.05 ± 0.10)|
|Surface area (m2/g)||(88.05 ± 1.03)|
|Average pore diameter (Ẳ)||(176.32 ± 0.25)|
|Average pore volume (mL/g)||(0.2641 ± 0.003)|
|Conductivity (μS/cm)||(112.0 ± 2)|
|Humidity (%)||(1.48 ± 0.16)|
|The rate of ash (%)||(1.68 ± 0.02)|
|The percentage of organic matter (%)||(98.32 ± 0.11)|
Table 2: Physical and chemical properties of the apricot stones activated carbon (ASAC).
Batch mode adsorption studies
The effects of the experimental parameters such as the initial CB concentration (10-100 mg/L), pH (2-10), adsorbent dosage (1-7 g/L) and temperature (295-329 K) on the adsorptive removal of CB ions is studied in a batch mode of operation for a specific period of contact time (0-60 min). The CB solutions are prepared by dissolving the accurate amount CB (99 %) in distilled water, used as a stock solution and diluted to the required initial concentration. pH is adjusted with 0.1 mol/L HCl or 0.1mol/L NaOH. For the kinetic studies, desired quantity of ASA is contacted with 10 mL of BC solutions in Erlenmeyer flasks. Then, the flasks are placed on a rotary shaker at 300 rpm and the samples are taken at regular time intervals and centrifuged at 3000 rpm for 10 min. The CB content in the supernatant was measured spectrophotometrically on a Perkin Elmer UV-visible spectrophotometer model 550S at wavelength of 595 nm. The amount of CB ions adsorbed by activated carbon qt (mg/g) is calculated by using the following equation (A1):
Where Co is the initial CB concentration and Ct the CB concentrations (mg/L) at any time, V the volume of solution (L) and m the mass of the activated carbon (g).
Due to the inherent bias resulting from linearization of the isotherm and kinetic models, the non-linear regression Root Mean Square Error (RMSE) test is employed as criterion for the quality of fitting .
The RMSE of a model is evaluated by the following equation (A2) :
Where, qe(exp) (mg/g) is the experimental value of uptake, qe(cal) the calculated value of uptake using a model (mg/g), and N the number of observations in the experiment (the number of data points). The small the RMSE values, the better the curve fitting .
The Fourier Transform Infrared (FTIR) spectrophotometer was used to identify the characteristic functional groups in the adsorption onto ASAC. 5 mg of ASAC was mixed with dry spectroscopic KBr. The mixture was thoroughly mixed and pressed under a pressure of 4500 psi to form KBr thin disc. Then, the IR spectrum was plotted with a Perkin Elmer 2000 infrared spectrometer. The sample was scanned from 4000-400 cm-1 for 16 times to increase the signal to noise ratio.
The X-ray Diffraction (XRD) patterns of the Native Apricot Stone (NAS) and ASAC were obtained by using a Philips X-ray diffractometer of PW 1890 model. X-rays were generated from a tube with a copper target (40 kV, 40 mA, λ = 1.54 Å). The spectra were obtained with CONIT T-2T scan mode at 0.17 deg/step of step width and 8 deg/min of scan speed.
To observe the surface structure of the prepared ASAC before and after adsorption of the CB ions, scanning electron micrographs were taken with different resolutions by using a Scanning Electron Microscope (JOEL-5910).
The specific surface area (A) was determined on a Micromeritics ASAP2010M volumetric adsorption analyzer at 77 K. The sample was degassed under vacuum at 573 K overnight before the measurement.
Results and Discussion
Structural characterization by infrared spectroscopy analysis
The Fourier Transform Infrared (FTIR) spectrum of ASAC is shown in Figure 1. The FTIR spectra of the adsorbent display a number of absorption peaks, indicating that many functional groups are present in the adsorbent. Peak positions are observed at 3436, 2929, 1732, 1599 and 1508 cm-1. The band in the region between 3122-3680 cm-1 is related to the hydroxyl (-OH) groups (libber and intermolecular hydrogen band). The band at 2929 and 1508 cm-1 suggest the presence of (–CH2) groups (symmetric and antisymetric) while the band in the region 1600-1665 cm-1 suggest the presence of groups (C-H, -C=Cand C=C). The peak at 1732 cm-1 is assigned to C=O in the carboxylic groups. These results clearly indicate that functional groups including carboxylic and hydroxyl groups contribute to adsorption acid dye ions binding.
Characterization of the prepared ASAC:
The physical and chemical properties of ASAC and the elementary analysis are summarized in Table 2. The XRD patterns of the (NAS) and the prepared ASAC are shown in Figures 2a and 2b, respectively. One can conclude from the ASAC pattern that there are no definite XRD peaks, suggesting that ASAC is mostly amorphous.
Scanning Electron Microscopy (SEM) analysis of the prepared ASAC:
SEM micrographs of ASAC before and after adsorption are pictured in Figures 3a and 3b respectively. The prepared ASAC presents a microporous structure with different pore diameters. In addition, the ASAC surface seems to be rough and presents many protrusions before adsorption. After adsorption, the ASAC morphology has changed and the surface has become smoother with less visible pores, indicating an adsorption on both the surface and within pores.
Effect of analytical parameters
Effect of ASAC size: In the first stage of batch adsorption experiments on ASAC, the effect of particle sizes on the acid dye adsorption by ASAC is examined. Significant variations in the uptake capacity and removal efficiency were observed at different particles sizes, indicating that the best performance is obtained with lower particle sizes (315-800 μm). In general, smaller particles provide large surface area, resulting in high acid dye uptake capacity and removal efficiency. The range (315-800 μm) is subsequently used in all adsorption experiments (Figure 4).
Effect of pH: The pH of the CB solution plays an important role in the adsorption process. It is evident that the percentage of acid dye removal increases consistently with decreasing pH (Figure 5). The effect of pH on the adsorption by ASAC can be explained on the basis of the point of zero charge pH(zpc), for which the adsorbent surface is neutral. The surface charge of the adsorbent is positive when the medium pH is under the pH(zpc) value and negative for pH over pH(zpc) . Consequently due to electrostatic attraction, the adsorption of CB anions is favored. Indeed, the CB molecule presents differently charged states, corresponding to the amount of positive charges at the three nitrogen atoms present, while the two sulfonic acid groups are normally always negatively charged. Above pH 2, only one nitrogen atom carries a positive charge and the dye molecule is a blue anion with an overall charge of -1.
The pH(zpc) of ASAC is 7.05 (Figure 6) and the surface charge of ASAC is negative at higher pH. As the pH decreases, the number of positively charged sites increases and favours the adsorption of CB anion by electrostatic attractions. Similar experimental details have been reported by Demirbas .
Effect of stirring speed: The effect of stirring speed on ASA adsorption is also investigated. The maximum adsorption is obtained for a speed of 300 rpm (Figure 7). Such moderate speed gives the best homogeneity for the mixture suspension. At high speed, a vortex phenomenon occurs and the suspension is no longer homogenous which makes the adsorption of CB ions difficult.
Effect of contact time and initial concentration: The adsorption capacity of CB increases with time and attains a maximum value after 55 min and thereafter, it reaches a constant value indicating that no more CB ions are further removed from the solution. The equilibrium time works out to be 60 mn. Thus changing the initial concentration of acid dye from 10 to 100 mg/L, the adsorbed amount increases from 8.09 to 66.17 mg/g (Figure 8). This may be attributed to an increase in the driving force of the concentrations gradient with increasing the initial acid dye concentration in order to overcome the mass transfer resistance of CB ions between the aqueous and solid phases.
Effect of adsorbent dosage: For the first stage of batch adsorption experiments on ASAC, the effect of adsorbent dosage on the acid dye adsorption by ASAC is examined. Significant variations in the uptake capacity and removal efficiency are observed at different adsorbent dosages (1 to 7 g/L) indicate that the best performance is obtained with an adsorbent dosage of 7 g/L (Figure 9), this result was expected because the removal efficiency is generally increased by the fact that more mass available, more the contact surface offered to the adsorption. Moreover, the higher dose of adsorbent in the solution, the greater availability of exchangeable sites for the ions, i.e. more active sites are available for binding of CB ions. Our results are qualitatively in a good agreement with those found in the literatures. This result is subsequently used in all isotherms adsorption experiments.
Adsorption isotherms: The shape of the isotherms is the first experimental tool to diagnose the nature of a specific adsorption phenomenon. The isotherms have been classified according to Giles et al.  in four main groups: L, S, H, and C. According to the above classification, the isotherms of ASAC at different temperatures (22.5 °C and 50 °C) display L type curve (Figure 10). The initial part of the L curve indicates a small interaction between acid dye and the carrier at low concentrations. However, as the concentration in the liquid phase increases, the adsorption occurs more readily. This behaviour is due to a synergistic effect, with the adsorbed molecules facilitating the adsorption of additional molecules as a result of attractive interaction adsorbate-adsorbate. The equilibrium relationships between the adsorbent and adsorbate are described by the Langmuir  and the Freundlich models  and the applicability to the adsorption study done is compared by evaluating the statistic RMSE values. The linear forms of the Langmuir and Freundlich isotherms are represented by the following equations (B1) and (B2):
Where Ce is the equilibrium concentration (mg/L), qmax the monolayer adsorption capacity (mg/g) and KL the constant related to the free adsorption energy (Langmuir constant, L/ mg).
The constant KF indicates the adsorption capacity of the adsorbent (L/g) and n is an empirical constant related to the magnitude of the adsorption driving force. The linearized forms of the Langmuir and Freundlich isotherms of CB for two temperatures (22.5 and 50 °C) and the theoretical parameters along with the regression coefficients are listed in Table 3. The smaller RMSE values obtained for the Freundlich model indicate a better curve fitting. The favourable nature of the adsorption can be expressed in terms of dimensionless separation factor of equilibrium parameter, which is defined by equation (B3) :
Table 3: Sorption isotherm coefficients of Langmuir and Freundlich models
Where KL is the Langmuir constant and Co the initial concentration of the adsorbate in solution. The values of RL indicates the type of isotherm: irreversible (RL= 0), favourable (0 < RL<1), linear (RL=1) or unfavourable (RL> 1). In this study, the RL values are less than 1, confirming that the adsorption process is favoured in both the cases as well as the applicability of Langmuir isotherm.
Adsorption kinetics: The kinetic study is important for the adsorption process, it describes the uptake rate of adsorbate and controls the residual time of the whole adsorption process. Two kinetic models namely the pseudo first order and pseudo second-order are selected in this study to describe the adsorption. The pseudo first order equation  is given in equation (C1):
Where qt (mg/g) is the amount of metal adsorbed on the adsorbent at various times t (min), K1 the rate constant of the pseudofirst order kinetic (min-1), K2 the rate constant of the pseudo-second order kinetic (g/mg min).
The rate constants, predicted uptakes and the correlation coefficients for ASAC are summarized in Table 4. For the pseudo-first order kinetic, the experimental data deviate greatly from linearity. This was evidenced by the low values of qe and correlation coefficients. Therefore, the pseudo-first order model is inapplicable to this system. The correlation coefficient and qe,cal of the pseudo-second order kinetic model are in good agreement with the experimental results (Table 4).
Table 4: Kinetic parameters for adsorption of CB ions onto ASAC
Effect of temperature: The Activation Energy (Ea) of acid dye BC adsorption onto ASAC is calculated by from the Arrhenius equation (D1) .
The rate constant k (Table 5) increases with increasing the temperature, indicating that the adsorption is favored at high temperature where R is the gas constant (8.314 J/K.mol), and T the temperature (K). The activation energy (66.161 kJ/mol) is computed from the slope of the plot of lnk versus 1/T (Figure 11). The thermodynamic parameters were calculated in the range temperature studies and given in Table 6.
Table 5: The rate constant k2 at different temperatures
Table 6: Thermodynamic parameters for the CB adsorption on ASAC
Performance of the prepared ASAC: In order to have an idea about the efficiency of the prepared ASAC, a comparison of acid dye adsorption of this work and other relevant studies is reported in Table 7. The adsorption capacity of the adsorbent qmax is the parameter used for the comparison. One can conclude that the value of qmax is in good agreement with those of most previous works, suggesting that CB could be easily adsorbed on ASAC used in this work. This indicates that the apricot stone, very abundant in Algeria, is a cheap and effective adsorbent for the CB.
Table 7: Comparison of ASAC performances with precursors from previous studies
This study has shown that activated carbon prepared from apricot stone can be employed as effective adsorbent for the removal of Coomassie Blue from aqueous solution. The Freundlich isotherm model provided a better fit of the equilibrium adsorption data than the Langmuir isotherm one. It gave a maximum adsorption capacity of 10.04 mg/g at temperature 22.5°C which increased up to 98.04 mg/g at 50°C at pH ~ 2. The pseudo-second order model proved the best description of the kinetic data. The negative values of ΔG and ΔH indicate that the adsorption of CB onto ASAC is spontaneous and exothermic over the studied range of temperatures. The positive value of ΔS state clearly that the randomness increased at the solid–solution interface during the CB adsorption onto ASAC, indicating that some structural exchange may occur among the active sites of the adsorbent and the ions. The activation energy and the rate constant increase with increasing temperature, indicating that adsorption is favored at high temperature. The adsorption of CB ions by ASAC follows a pseudosecond order kinetic model, which relies on the assumption that chemisorptions may be the rate-limiting step. In chemisorption, the CB ions are attached to the adsorbent surface by forming a chemical bond and tend to find sites that maximize their coordination number with the surface. This study in tiny batch gave rise to encouraging result, and we wish to achieve the adsorption tests in column mode under the conditions applicable to the treatment of industrial effluents and the present investigation showed that ASAC is a potentially useful adsorbent for the metals, acid and basic dyes.
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Citation: Moussa A, Abdelhamid C, Samia K, Tounsia A, Mohamed T (2015) Kinetic and Equilibrium Studies of Coomassie Blue G-250 Adsorption on Apricot Stone Activated Carbon. J Environ Anal Toxicol 5: 264. Doi: 10.4172/2161-0525.1000264
Copyright: © 2015 Moussa A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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