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Removal of Basic Violet 14 from aqueous solution using sulphuric acid activated materials

Abstract

In this study the adsorption of Basic Violet, 14 from aqueous solution onto sulphuric acid activated materials prepared from Calophyllum inophyllum (CS) and Theobroma cacao (TS) shells were investigated. The experimental data were analysed by Langmuir, Freundlich and Temkin isotherm models. The results showed that CS has a superior adsorption capacity compared to the TS. The adsorption capacity was found to be 1416.43 mg/g for CS and 980.39 mg/g for TS. The kinetic data results at different concentrations were analysed using pseudo first-order and pseudo-second order model. Boyd plot indicates that the dye adsorption onto CS and TS is controlled by film diffusion. The adsorbents were characterised by scanning electron microscopy. The materials used in this study were economical waste products and hence can be an attractive alternative to costlier adsorbents for dye removal in industrial wastewater treatment processes.

Background

Colour is an important characteristic of effluent and it leads to serious environmental threat. The highly coloured dyes affect the water bodies by inhibiting sunlight penetration and hence affecting the photosynthetic activity. These highly coloured dyes are extensively used for colouring in industries like textile, paper, leather and cosmetic industries. Dyes and pigments are highly toxic, carcinogenic and mutagenic (Dutta 1994; Yagub et al. 2014). The worldwide dye consumption in textile industry is more than 107 kg/year that is mainly used in fabrics (Ahamed et al. 2007).

As dyes have a complex structure and synthetic origin, it is difficult to decolourise and various treatment methods have different efficiency in treating dye waste water. There are different treatment methods to decolourise dye waste water like coagulation (Orfao et al. 2006), Photocatalytic degradation (Sun et al. 2008), electrochemical, degradation (Fan et al. 2008), chemical oxidation, ozonation and coagulation (Arslan 2001; Kim et al. 2005). However, these processes are costly and cannot be effectively used for a wide range of dye wastewater.

Adsorption using low cost adsorbents is widely used, since it is one of the most effective methods for dye removal from wastewaters because of their unique properties in adsorption of both cationic and anionic dyes. The advantages of adsorption process are simplicity in operation, inexpensive compared to other separation methods, insensitivity to toxic substances and no sludge formation (Waranusantigul et al. 2003).

In treatment of colored effluents different low-cost adsorbents have been investigated at the laboratory scale for effective treatment with different degrees of success (Bhattacharyya and Sharma 2005). Some of the low cost adsorbents are, waste pea shells (Khan et al. 2014), water chestnut peel (Khan et al. 2013), bamboo sawdust (Khan and Nazir 2015), Curcuma angustifolia scales (Maiyalagan et al. 2014), Curry tree seed (Suresh et al. 2011a) Curry tree stem (Suresh et al. 2011b), etc. Still there is a need for effective adsorbents in dye wastewater treatment.

In this study the paper compares the ability of two sulphuric acid activated materials for removing Basic Violet 14 from aqueous solution using the shells of Calophyllum inophyllum (CS) and Theobroma cacao (TS) shells.

Experimental

Materials

Basic Violet 14 is a triaminotriphenylmethane dye (CI 42,510; Molecular weight: 337.85 g mol−1; Molecular Formula: C20H19N3·HCl; Maximum Wavelength: 540 nm. The molecular structure of Basic Violet 14 is shown in Fig. 1. The dye is inflammable and is used in coloring of textile and leather materials. The dye on ingestion may cause nausea, vomiting, diarrhea and the inhalation of dye causes irritation to respiratory tract. In humans and animals, its toxicity includes carcinogenic and mutagenic effects (Littlefield et al. 1985).

Fig. 1
figure 1

SEM micrograph of CS a before dye adsorption, b after dye adsorption and TS adsorbent material c before dye adsorption, d after dye adsorption

Preparation of adsorbent

The raw material Calophyllum inophyllum (CS) shell and Theobroma cacao (TS) shells were collected and it is washed with water to remove the dirt, dust and other surface impurities. The washed shells were dried for 24 h. The dried shells were then soaked in 18N∙H2SO4 (1:2, w/v) and kept in oven at 120 °C for 12 h. This is done to activate the carbonaceous material by chemical activation. The product is washed several times with distilled water and soaked in 1 % sodium bicarbonate solution for 12 h to remove any residual acid and kept in oven at 110 °C for 12 h. The acid treated biomass adsorbent, thus obtained is crushed and sieved to uniform particle size using ASTM standard sieve (Mesh No. 100). The adsorbents thus obtained were labeled as CS and TS.

Batch adsorption experiments

Adsorption experiments were carried out with CS and TS at a varying dye concentration with a fixed adsorbent dose. To study the efficiency to remove Basic Violet 14 from aqueous solution and to find the isotherm constants, experiments were conducted with, 50 mL of various concentrations of dye solutions in a conical flask with fixed adsorbent dosage. Experiments were carried out in the natural pH of the dye solution at room temperature. This mixture was agitated on a mechanical shaker at a constant speed for about 2 h. The dye solutions, after agitation were separated from the adsorbent and the equilibrium dye concentrations were determined spectrophotometrically by measuring the absorbance changes at the wavelength of maximum absorbance (540 nm). Kinetic experiments were carried out using a mechanical stirrer in the concentration range of 260–380 mg/L. The percentage dye removal was accessed using the formula.

$${\text{Percentage}}\;{\text{dye}}\;{\text{removal}} = \frac{{{\text{C}}_{\text{i}} - {\text{C}}_{\text{f}} \, }}{{{\text{C}}_{\text{i}} }} \times 100$$
(1)

The amount adsorbed at equilibrium qe (mg/g) was calculated by

$${\text{Amount}}\;{\text{adsorbed}}\;\left( {q_{\text{e}} } \right) = {\text{C}}_{\text{i}} - {\text{C}}_{\text{f}} \times \frac{\text{V}}{\text{M}}$$
(2)

where C i and C f are the liquid phase concentrations of the dye at initial and final concentrations (mg/L) respectively. M the mass (g) of adsorbents and V is the volume of dye solution (L).

Results and discussion

Characterization of adsorbent

The surface morphologies of the sulphuric acid activated adsorbents CS and TS were analyzed by scanning electron microscroscope (SEM). The surface of the adsorbents CS and TS prior to adsorption process and after the adsorption was shown in Fig. 1a–d. It is clear, that the adsorbents have a rough morphology with considerable porous nature where suitable conditions exist for the dye to be trapped and adsorbed into the adsorbent. The SEM image of CS shows a good morphology compared to TS for adsorption. It is evident from Fig. 1b, that the surface of CS is covered by a layer of Basic Violet 14 and significant changes were observed due to dye adsorption. In TS as a result of entrapment of the dye into the adsorbent a homogeneously dye adhered surface can be observed in Fig. 1d.

The functional groups on CS and TS were identified using FT-IR and the results of the characterized samples were shown in Fig. 2a, b. The band at 3421 cm−1 in the adsorbent CS represented O–H stretching vibration of alcoholic groups. The band at 2336 cm−1 corresponds to the N–H stretching (Hameed and El-Khaiary 2008). The band at 1699 cm−1 is attributed to the C=O stretching of carboxylate anion (Minamisawa et al. 2004). The band at 1221 cm−1 is assigned to S=O stretching. The band at 860 cm−1 is seen due the presence of \({-}{\text{SO}}_{3}^{ - }\) group (Kannan 2014; Figueira et al. 1999) and this band disappears when CS is loaded with the dye. The functional group in this region seems to participate in dye binding. The band at 590 cm−1 is due to C-S stretching. TS shows absorption band at 3423 cm−1 due to O–H stretching of hydroxyl groups. The band at 2930 cm−1 in TS is due to a weak alkyl C–H stretching. The band at 1700 cm−1 is due to C=O stretching. The bands at 1623 cm−1 and 1200 cm−1 corresponds to C=C stretching and S=O stretching. The bands at 861 cm−1 and 871 cm−1 due to S=O indicates the presence of –SO3̶ group, is observed to disappear when TS is loaded with the dye and hence the functional group in this region participates in dye binding. The presence of the band at 590 cm−1 in CS and 589 cm−1 in TS is due to C–S stretching and this band is reduced in band height after adsorption and hence, it appears that this group involves in adsorption. The surface of the sulphuric acid activated adsorbent surface of CS and TS has polar functional group present in it that provides anion exchange capacity for the dye. As the reaction proceeds, in CS and TS the negatively charged surface functional group interacts strongly with the dye molecule to facilitate the ion exchange process, and hence provides good adsorption capacity for the adsorbents.

Fig. 2
figure 2

FT-IR spectra of a CS, b TS adsorbent material

Effect of adsorbent dosage

To find the effect of adsorbent dosage on to the adsorbate, a fixed adsorbate concentration of 260 mg/L and a constant volume (50 mL) is taken, keeping all other experimental conditions constant. It is observed that the amount of Basic Violet 14 adsorbed decreases as the concentration of the adsorbent increases. Thus, it can be observed that maximum dye removal occurs at 10 mg to 30 mg in both CS and TS and then decreased with increase in adsorbent mass.

From Fig. 3, it is observed that for an increase in CS and TS adsorption from 5 to 55 mg the dye uptake decreases from 1523 to 258 mg/g for CS and 1069 to 258 mg/g for TS. The dye adsorption increases with the increase in adsorbent doses and after a particular limit the adsorption slowly decreases and becomes constant for CS and TS. The increase in percentage colour removal with adsorbent dosage can be attributed to the availability of more adsorption sites (Garg et al. 2003). Another reason for the decrease in adsorption capacity with increase in adsorbent mass is an aggregation/agglomeration of adsorbent particles at higher concentrations. It is observed that dye removal by CS and TS is effective at a low adsorbent dosage for the removal of Basic Violet 14 from aqueous solution.

Fig. 3
figure 3

Effect of adsorbent dosage a CS, b TS adsorbent (C0 = 260 mg/L; V = 0.05 L)

Adsorption isotherms

The linear form of three isotherms namely Langmuir and Freundlich and Temkin (Hameed and Daud 2008) were used to analyse the isotherm data. The adsorption isotherm is important from theoretical and practical point of view. The linear form of the equation is given as

$${\text{C}}_{\text{e}} /{\text{q}}_{\text{e}} = 1/{\text{Q}}_{\hbox{max} } {\text{K}}_{\text{L}} + {\text{C}}_{\text{e}} /{\text{Q}}_{\hbox{max} }$$
(3)
$$\log q_{\text{e}} = 1/n\log C_{\text{e}} + \log {\text{K}}_{\text{F}}$$
(4)
$$q_{\text{e}} = B\ln A + B\ln C_{\text{e}}$$
(5)

The values of Q m and K L were calculated from the slope and intercept of the linear plot (Fig. 4a). The better R2 value for Langmuir isotherm indicates the applicability of this model for CS and TS. The applicability of the Langmuir isotherm for both CS and TS suggests the monolayer coverage of adsorbate on the surface of adsorbents (Langmuir 1918). The isotherm parameters obtained using the linear form of Eq. (3) is given in Table 1. The RL value observed indicates the type of isotherm to be favourable (0 < R L < 1), linear (R L = 1), unfavourable (R L > 1) or irreversible R L = 0. The value K L is the Langmuir constant and C 0 is the highest initial dye concentration (mg/L). The value of RL is found to be in the range of 0.1761 to 0.1278 for CS and 0.0612 to 0.0417 for TS,

Fig. 4
figure 4

a Langmuir isotherm, b Temkin isotherm for CS and TS adsorbent

Table 1 Langmuir, Freundlich and Temkin constants for CS and TS
$$R_{\text{L}} = 1/(1 + K_{\text{L}} C_{0} )$$
(6)

From Table 1, Q m, the maximum monolayer adsorption capacity of CS is found to be 1416.43 mg/g and for TS is found to be 980.39 mg/g. The applicability of the linear form of the Langmuir model to CS and TS, proved by the high correlation coefficients R 2 > 0.998 suggests that the Langmuir isotherm provides a good model of the sorption system.

The Freundlich constants KF and n can be calculated from the slope and intercept of the linear plot with log qe versus logCe. The magnitude of the component ‘n’ gives an indication of the favourability of adsorption process and KF is the constant related to the adsorption capacity.

According to Treybal (1980), it has been shown that n > 1, represents favorable adsorption. The n value was found to be 1.85 for CS and 3.51 for TS which indicates favourable adsorption. 1/n indicates the adsorption intensity of dye onto the adsorbent or surface heterogeneity, becoming more heterogeneous as its value gets closer to 0. The isotherm constants Kf and n were calculated from the linear form of the model and the value of Kf, n, and the Correlation Coefficients are given in the Table 1.

The linear form of the Temkin equation is used to analyze the adsorption data and it is observed that the Temkin isotherm fitted well for CS and TS. The Temkin isotherm constants were calculated from the plot of qe versus ln Ce (Fig. 4b) and are given in the Table 1. In CS and TS the Temkin isotherm fitted well with a high correlation coefficient. The isotherm data’s were well represented by the Langmuir, and Temkin isotherm with R2 values fitting in the following series, Langmuir > Temkin > Freundlich. In CS and TS the R2 values were found to be high (>0.99) for all the three isotherms studied, hence, it can be concluded that both monolayer and heterogenous surface conditions exists in the present study. Since CS and TS is observed to have good adsorption capacity and hence it can be used as an effective, low cost adsorbent as an alternative material to commercial activated carbon in the removal of dyes from aqueous solution.

Kinetics

In order to analyse the adsorption process for pseudo first order and pseudo second order model (Hameed and Daud 2008) the kinetic equations were used.

$${\text{Log}}\left( {{\text{q}}_{\text{e}} - {\text{q}}_{\text{t}} } \right) = \log {\text{q}}_{\text{e}} {-}{\text{k}}_{1} /2.303{\text{t}}$$
(7)
$${\text{t}}/{\text{q}}_{\text{t}} = 1/{\text{k}}_{2} {\text{q}}_{\text{t}}^{2} + {\text{t}}/{\text{q}}_{\text{t}}$$
(8)

The kinetic study of CS and TS at different initial dye concentration was carried out and the kinetic data were analyzed using pseudo first order and pseudo second order model. The kinetic parameters give important information for designing and modeling the adsorption process. It is observed that the adsorption of dye on the adsorbent surface takes place by an initial rapid binding of the dye molecule on the adsorbent.

The correlation coefficient (R2) value from Table 2 shows that the pseudo second order model provides the best fit for the adsorption of CS and TS. The correlation coefficient of 0.9973 to 0.9983 for CS indicates that it is a good correlation for pseudo second order model and hence this model is suitable to provide the best fit when compared to the pseudo first order model. The correlation coefficient in TS is >0.997 for pseudo second order model and <0.996 in pseudo first order model. This confirms that pseudo second order model provides the best fit in both CS and TS.

Table 2 Kinetic model values for the adsorption of Basic Violet 14 on to CS and TS

A Plot of log(qe − qt) versus time for CS and TS enables to calculate the rate constant k1 and from the slope and intercept of the plot qe(pred) can be calculated. The adsorption kinetics of Basic Violet 14 from aqueous solution by CS and TS is studied and the influence of various operating parameters on the adsorption process is evaluated. It is observed that the dye uptake was very rapid and the saturation time was found to be 60 min in CS and 40 min in TS.

A plot of t/qt versus t enables to calculate the rate constant k2 that is used to calculate the initial sorption rate h as follows

$${\text{h}} = {\text{k}}_{2} {\text{q}}_{\text{e}}^{2}$$
(9)

Now, the initial sorption rate h, rate constant k2 and qe(calc) for CS and TS can be obtained from the plot of t/qt versus t (Fig. 5). The qe values calculated from the pseudo-second order model system is in better agreement with the experimental qe values for CS and TS. The second order rate constant k2 was found to increase and decrease Basic Violet 14 concentration in CS. A similar trend was observed in the literature for the increase and decrease in k2 with an increase in solute concentration (Ahmad and Rahman 2011). However, in most of the adsorption systems, there exists a trend between the initial dye concentrations and k2 with a decreasing k2 value with the increase in initial dye concentration. A similar trend was observed in TS, with a decrease in k2 for an increase in initial dye concentration (Ho 2004). The correlation coefficient (R2) of the linear plot is very high (>0.997) for all the concentrations studied in pseudo second order model. The material surface has negatively charged surface functional group which interacts strongly with the cationic dye influencing the adsorption process. The values of kinetic constants and qe of Basic Violet 14 adsorption onto CS and TS are given in Table 2.

Fig. 5
figure 5

Pseudo second order Kinetics plot for the adsorption of Basic violet 14 onto a CS and b TS adsorbent

The Table 3 gives the adsorption capacity of some low cost adsorbents used for the adsorption of dyes along with CS and TS. It is clear that in this study the adsorption of the basic dye by the sulphuric acid activated materials prepared from CS and TS is good when compared with some of the adsorbents already reported for the adsorption of basic dyes from aqueous solution.

Table 3 Adsorption capacities of different low cost adsorbents for dye removal from aqueous solution

Adsorption mechanism

The adsorption kinetic data of CS and TS were analysed to identify the diffusion mechanism using the Intraparticle diffusion model proposed by Weber and Morris (Weber and Morris 1963)

$${\text{q}}_{\text{t}} = {\text{k}}_{\text{p}} {\text{t}}^{1/2} + {\text{C}}$$
(10)

where kp is the intraparticle diffusion rate constant and C is the intercept that is obtained from the slope of the plot of qt versus t1/2 (Fig. 6). The kp for CS and TS were found to be in the range of 95.92 to 130.82 for CS and 98.53 to 115.12 for TS. The two phases in the CS and TS intraparticle diffusion plot represents an initial surface adsorption in the reaction and then the next phase is intraparticle diffusion. In the plot of qt versus t1/2 for CS and TS if the straight line passes through the origin, then intraparticle diffusion is the only rate controlling step, or if it does not pass through the origin, then surface adsorption is the rate controlling step. In the present study for both CS and TS the plot does not pass through the origin, hence surface adsorption is the rate controlling step. The intercept C value in Table 4 discusses about the thickness of the boundary layer. The increase in the constant C for CS and TS indicates internal mass transfer and hence the increase in thickness of the boundary layer.

Fig. 6
figure 6

Intraparticle diffusion plot for the adsorption of Basic violet 14 onto a CS and b TS adsorbent

Table 4 Intraparticle diffusion coefficient and diffusion coefficient (Di) for CS and TS

Three types of mechanism are involved in the adsorption process like film diffusion, particle diffusion and the adsorption of the solute molecules on the interior surface of the adsorbent (Chingobe et al. 2006). Since, the third step is fast and negligible it is necessary to distinguish between film and particle diffusion. Therefore Boyd model is used to study the actual slow step using the expression (Boyd et al. 1947)

$${\text{Bt}} = - 0.4977 - \ln (1 - {\text{F}})$$
(11)

where, F represents the fraction of dye adsorbed at any time t, and Bt is a mathematical function of F. The Bt versus time plot (Fig. 7) For CS and TS distinguishes film diffusion and particle diffusion. If the plots are linear and pass through the origin, then the slowest step in the adsorption process is the particle diffusion and if the linear plot does not pass through the origin then film diffusion controls the adsorption process. In this study the plots for CS and TS were found to be linear, at all concentrations and does not pass through the origin, confirming surface adsorption as the rate limiting step. The dye cation interacts strongly with the negatively charged surface functional group in the sulphuric acid activated materials resulting in effective adsorption. The B values were used to calculate the effective diffusion coefficient, Di (m2/s) using the following relationship

$${\text{B}} = \frac{{\pi^{2} {\text{D}}_{\text{i}} }}{{{\text{r}}^{2} }}$$
(12)

The B values were calculated for CS and TS and the results are shown in the Table 4.

Fig. 7
figure 7

Boyd plot for the adsorption of Basic violet 14 onto a CS and b TS adsorbent

Conclusion

Basic Violet 14 adsorbs effectively in the surface of the two sulphuric acid activated adsorbents CS and TS and equilibrium is attained in 60 min for CS and 40 min for TS. The isotherm data prove monolayer adsorption for CS and TS and the adsorption capacity was found to be 1416.43 mg/g for CS and 980.39 mg/g for TS. The kinetic study proves that the pseudo second order model provides the best fit for both the adsorbents. Film diffusion process is involved in the adsorption of Basic Violet 14 onto CS and TS. The comparative studies on the adsorption of prepared activated carbons CS and TS onto Basic Violet 14 showed a higher percentage of dye removal for CS. This study shows that the sulphuric acid activated adsorbent CS and TS can be used as an effective material in the adsorption of Basic Violet 14 from aqueous solution.

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Acknowledgements

The Author is thankful to Centre for Nanoscience and Technology, Anna University, for SEM analysis and SAIF, IIT Madras for FT-IR analysis.

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The author declare that he has no competing interests.

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Suresh, S. Removal of Basic Violet 14 from aqueous solution using sulphuric acid activated materials. SpringerPlus 5, 633 (2016). https://doi.org/10.1186/s40064-016-2294-2

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