Abstract
In the current work, a by-product of local olive pomace was valorized as an eco-friendly biosorbent to clear Basic Red 46 dye (BR46). The surface properties of the biosorbent were studied by various analytical implements such as XRF, XRD, FTIR, SEM, and pHpzc. High removal rates (> 90%) were attained at optimal parameters: 240 min of contact, pH of 7, and 400 rpm at 23 °C. The Freundlich model presented the best adjustment of equilibrium curves, while the pseudo-second-order model was the practical kinetic model that matched the experimental data. The results of the thermodynamic investigation revealed that the adsorption process is spontaneous (ΔG° < 0), exothermic ΔH° (− 40.345 kJ/mol), and probably physical. This study showed that the native olive pomace residue could be successfully transformed into green sorbents of water contaminants.
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1 Introduction
Water, which accounts for almost two-thirds of the earth’s surface, is crucial to maintaining life and producing goods in the industrial and agricultural sectors [1]. Nevertheless, due to the growth of industry and urbanization, wastewater dismissal has grown more hazardous, leading to a considerable increase in water pollution [2]. Consequently, the need for clean drinking water has evolved into a problem affecting around 3 billion people [3].
The textile dyeing industry is among the most complicated industrial sectors, characterized by the potential for significant consumption of water, energy, and chemical resources as well as the disposal of enormous volumes of polluted effluent. Many researchers consider it the world’s most environmentally polluting industry [4]. Due to their non-biodegradability, carcinogenicity, and mutagenicity, synthetic dyes and their byproducts are among the most toxic effluents, hurting aquatic life, human health, and the environment [5]. Since cationic dyes are some of the most often used dyes in the textile industry, there has been an increased focus on properly administering these dyes in recent years. Basic Red 46 is a kind of azo cationic dye well-known for its chemical stability, which represents better than 10% of all dyes yielded worldwide and is ranked as a harmful organic compound. It also harms aquatic organisms since it impedes the photosynthetic process by decreasing sunlight penetration in water [6]. Before leaving this hazardous pigment in bodies of water, it must first be removed since this might cause harm to the surrounding ecosystem.
Particular focus has been placed on eliminating dyes, with various physical, chemical, and biological procedures used to draw these pervasive contaminants from the environment [7,8,9,10]. Even though the processes defined overhead are thriving, they are not viable to employ on a considerable ranking owing to extended working lengths, extreme chemical intake, workforce necessities, heightened costs, and sludge forming, inducing secondary polluting. Given its simple design, ease, effectiveness, ease of operation, environmental, inexpensive pricing, and flexibility, adsorption is becoming an increasingly popular alternative technique for removing dye from textile effluents [11]. Furthermore, several adsorbents, such as biochar prepared from Chrysanthemum morifolium Ramat straw [12], Fe@graphite core–shell magnetic nanocomposite [13], and commercial-activated carbon (Norit PK 1–3) [14], have recently been explored for their removal. However, these materials have various limitations due to their high cost and complex production techniques. As a result, it is critical to look for adsorbents with cheap investment costs and a suitable dye removal undertaking.
The biosorption approach, which employs a variety of natural biomass byproduct materials, offers an attractive alternative for solid waste management and dye remediation. For this purpose, numerous bio-based materials have been used lately for adsorptive dye removal, featuring, Valeriana officinalis roots, bay leaves (Laurus nobilis L.), water tea residue, Rumex acetosella, banana, cucumber and potato peels, pomegranate cactus, almond peels, and Judas tree (Cercis siliquastrum) seeds [15,16,17,18,19,20,21,22,23]. Because of the relative abundance and low cost of these biomass materials, as well as their effective dye molecules binding and sequestration potential linked with the abundance of active functional groups on the surface, the biosorption technique seems to be a reliable method for the efficient treatment of dye-polluted wastewaters.
Algeria’s Kabylie region is well-known for its olive cultivation, production, and derivatives. One of the most common by-products with little economic use is olive pomace. However, no prior study has been published that involves the biosorption of Basic Red 46 onto olive pomace. This research aims to use it as a green and cost-effective biosorbent in removing a cationic dye using a simple and effective adsorption approach. The sample was then characterized using various analytical implements, having XRF, XRD, FTIR, SEM, and pHpzc, to remove Basic Red 46. The process’s operating parameters are adjusted, whereas the isotherm, kinetic, and thermodynamics are checked. Per this view, this adsorbent can be an alternative exploited for water purification in treatment plants or rural towns.
2 Experimental part
2.1 Dye solution
The cationic dye Basic Red 46 (BR46) is acquired from a nearby textile plant and used immediately without further purification. The primary intention was to create a stock solution (1.0 g/L). Then, it was diluted to the concentrations required for test solutions. Utilizing a pH meter BOECO BT-675, the pH was adjusted with either HCl (0.1 mol/L) or NaOH (0.1 mol/L). Figure 1 depicts the HOMO–LUMO orbitals and molecular electrostatic potential surfaces of BR46 as computed by applying the General Atomic and Molecular Electronic Structure System (GAMESS) software.
2.2 Biosorbent
Initially, olive pomace (OP) was acquired from the discharge of a nearby olive mill. It was then flushed with distilled water, dried for 24 h in an oven at 80 °C, ground in a domestic grinder, and sifted into a particle size of 1 mm. The resulting powder was stored in an airtight desiccator receptacle until required.
2.3 Characterization of biosorbent
The elemental constitution of OP was investigated using a Rigaku X-ray Fluorescence Spectrometer “ZSX Primus II.” Powder X-ray diffraction (PANalytical Empyrean) was used for the crystallographic research, using a Cu K radiation source (= 0.15418 nm) and a 2θ running from 10 to 80°. The surface chemical groups were qualitatively investigated using Fourier-transform infrared spectroscopy (FTIR). FTIR spectra were obtained using a Nicolet IS5 spectrophotometer (resolution: 0.4 cm−1; a scan rate: 40 scan.min−1). The surface morphology was scrutinized using scanning electron microscopy (FEI Quanta 250). Several 50 mL solutions of NaCl (0.01 mol/L) were adjusted in pH from 2 to 12 using NaOH or HCl (0.01 mol/L) to get the pH at the point of zero charges (pHpzc). The mixes were then stirred for 24 h in Erlenmeyer flasks with 0.15 g of OP. Following the conclusion of the stirring time, the pHpzc was determined as the intersection of the results (plotting the pHfinal vs. pHinitial curve) with the bisector.
2.4 Adsorption experiments
Adsorption studies were conducted in batches to examine the effects of various operational factors, including contact duration, OP mass, stirring speed, beginning pH, medium reaction temperature, and initial dye concentration. Isotherms, kinetics, and thermodynamics were also investigated.
Following each test, the systems were centrifuged for 10 min at 6000 rpm. The remaining BR46 concentrations were then measured using a UV–vis spectrophotometer (SHIMADZU UV-1800) at the highest absorption wavelength (λmax = 531 nm).
Calculating the adsorption uptake (q) and removal percentage (R) utilized Eqs. (1) and (2):
C0 (mg/L) is the dye concentration at the beginning, Ce and Ct (mg/L) represent, respectively, dye concentrations at the equilibrium and at time t, V (L) is the volume of the solution, and M (g) is the material dried mass.
Several isotherm models featuring Langmuir, Freundlich, and Temkin may be used to study the interactions between BR46 and the OP surface [24,25,26]. These models are provided in turn in Eqs. (3), (4), and (5):
in which qe (mg/g) presents the adsorbed quantity at equilibrium, the final adsorbate’s concentration is Ce (mg/L), the monolayer adsorption capacity is qm (mg/g), the Langmuir and Freundlich constants are KL (L/mg) and KF, the adsorption intensity is n, A is the Temkin isotherm constant (L/mg) representing maximum binding energy, and B is the Temkin adsorption heat constant (J/mol).
The PFO and PSO kinetic models [27, 28] were investigated to explain the reaction sequence of BR46 adsorption onto OP. Equations (6) and (7) provide these models:
qt and qe represent the quantity of BR46 (mg.g−1) adsorbed respectively at time and at equilibrium, k1 represents the PFO rate constant (min−1), and k2 represents PSO’s rate constant (g/mg.min).
The best model fit was evaluated by regression coefficient R-square (R2), Adj. R-square, and chi-square test (χ2) [29, 30].
The intraparticle diffusion model was utilized to explore the rate-limiting step of the process [31]; its linear version is provided by Eq. (8):
ki represents intraparticle diffusion’s rate constant (mg/g.min).
The calculation of thermodynamic constants such as ΔG°, ΔH°, and ΔS° using Eqs. (9) and (10) facilitates understanding of the procedure:
Kd is the distribution coefficient (qe/Ce) [32], R represents the universal constant of gasses (~ 8314 J/mol.K), and T (K) represents the absolute temperature.
3 Results and discussion
3.1 Characterization
The major components of agricultural leftovers are cellulose, hemicellulose, and lignin [33]. Their primary constituents are carbon, oxygen, nitrogen, and hydrogen. The elemental makeup of olive pomace by-products is mostly carbon and oxygen, with 26.9% carbon (Table 1).
In general, agricultural leftovers are amorphous [34]. The XRD pattern of OP (Fig. 2) displayed a distinct and broad peak at 2θ = 21°, confirming its amorphous nature.
The OP’s FTIR spectrum before adsorption (Fig. 3) shows the following peaks: the prominent peak centered at 3301 cm−1 might be caused by stretching vibrations of the OH and NH groups overlapping [35], and at 2922 and 2852 cm−1, the asymmetric stretching vibration of C-H peaks occur [36]. C = O could be linked to the 1629 cm−1 peak [37], CN stretching/NH bending modes correspond to the peaks at 1510 and 1244 cm−1 [38], and peaks at 1443 and 1033 cm−1 are related to C = C and C-O [39]. After adsorption, almost all peaks have shifted positions, revealing that different functional groups on the OP surface could interact with dye molecules.
SEM pictures of OP shown at different magnifications may be seen in Fig. 4 a–d. It is possible to discern an irregular particle form and a rough, heterogeneous, and porous surface, telling that the environment is appropriate for dye molecules to get trapped and adsorbed onto this surface.
In addition, the findings of earlier research [20, 21] have shown that agricultural wastes have a tiny surface area, which is well recognized. However, they function well as adsorbents, implying that adsorption occurs mainly through surface interaction processes [40].
The pHpzc is an excellent tool for determining the adsorbent surface charge. The positive and negative charges on the adsorbent’s surface balance when the pH of the solution equals the pHpzc, resulting in an electrically neutral surface. Alternatively, because of the protonation of the surface functional group, the adsorbent surface is generally positively charged in a solution with a pH < pHpzc. Conversely, a solution pH > pHpzc produces a negatively charged surface containing deprotonated functional groups [41]. According to the data given in Table 1, the pHpzc of OP was almost neutral (7.42).
3.2 Adsorption parameters
Contact time
The aim of studying the influence of contact time on the adsorption process is to select the required duration to establish the adsorption equilibrium. The experiments were conducted out at a temperature of 20 °C, a stirring speed of 500 rpm, an adsorbent mass of 0.2 g, a pH of 7, and a dye concentration of 200 mg/L. Figure 5 reveals that the adsorption equilibrium is reached after 240 min. The considerable number of active sites readily accessible on the surface of the adsorbent may explain the rapid kinetics seen at the beginning of the reaction during the adsorption phase. As the rate of surface covering grows, it becomes more challenging to reach the remaining unoccupied spots; as a result, the adsorption rate evolves slowly [42].
Solution pH
Since the pH of the solution can influence the surface electrical charges of the adsorbent, the ionization of the dye molecules is likely the most crucial operational parameter in the adsorption process, specifically regarding adsorption capacity. The pH impact (2–10) on BR46 adsorption onto OP is seen in Fig. 6. The adsorption capacity rose from 8.72 (8.53%) to 30.21 mg/g (30.01%) when the pH was raised about 2 to 7, then dropped. For low pH values, the lowering in adsorption capacity may be justified by electrostatic repulsion among the cationic adsorbent surface and the dye molecule’s cations, along with a contest for adsorption sites among the hydronium cations and the BR46 cations. Owing to the favorable electrostatic interactions among the anionic adsorbent surface and the cation of the molecule dye, raising the pH improves the adsorption capacity [43]. The electrostatic attraction of hydroxyl anions surrounding the dye cations might be connected to the decline in BR46 retention at higher pHs, which inhibits the dye cations from interacting with the adsorbent anion sites and leads to a drop in BR46 retention.
Biosorbent mass
Figure 7 displays the impact of varying OP mass on adsorption performance. The rate of elimination of BR46 increases with increasing OP mass. Indeed, it goes from 1.85 to 94.22% when the mass of OP goes from 0.1 to 6 g, and then it becomes constant. The increase in PO mass leads to an increase in active sites. This results in an increased dye removal rate. When the mass of the biosorbent exceeds a specific value, the yield becomes constant because the addition of biosorbent no longer involves a boost in the accessible surface area of the grains following the formation of agglomerates [44].
Agitation speed
Figure 8 shows that the quantity adsorbed at equilibrium increases when the stirring speed w increases from 100 to 400 rpm, decreasing considerably. The low amount of dye adsorbed at lower stirring speeds is due to poor dispersion of the OP particles, decreasing the interaction surface between the OP surface and the dye molecules. When the stirring speed is excessively high, more than 400 rpm, giant vortices occur inside the solution, which reduces the adsorbate-biosorbent contact surface [45].
Temperature
Adsorption can be an endothermic or exothermic process, leaning on the adsorbent material’s nature and the adsorbent molecules. The quantity of BR46 dye removed and the rate at which it is removed decrease as the temperature is elevated (Fig. 9). This decline might result from the adsorbent’s active sites being damaged, as well as a reduction in the contact forces between those active sites and the adsorbate [46]. It is also possible that at higher temperatures, species mainly adsorbed on the surface of the adsorbent tend to desorb. The findings point to the possibility that the process will produce exothermic reactions.
Initial dye concentration
The influence of the initial dye concentration was scrutinized by varying the concentration from 20 to 200 mg/L (Fig. 10). The dye’s initial concentration significantly impacts how well the substance absorbs it. As the latter component increases, a higher amount is adsorbed due to a more substantial differential in concentration between BR46 and OP, which increases the driving force required to overcome the mass transfer barrier [47].
3.3 Adsorption isotherms
Figure 11 depicts the non-linear isotherm models’ plots. Compared to alternative models, the Freundlich model provides an outstanding fit predicated on R2, Adj. R-square, and χ2 values (Table 2), indicating that adsorption occurs on a heterogeneous surface with interactions among the deposited BR46 molecules [48]. Furthermore, 1/n was 0.862 < 1 (Table 2), showing that the isotherm is of type L, and the adsorption is spontaneous and favorable [49]. In addition, the heterogeneity factor of the Freundlich model (n) could indicate if the process is linear (n = 1.0), chemical (n < 1.0), or physical (n > 1.0). The value of n was 1.16 suggesting a physical process of adsorption [50].
3.4 Adsorption kinetics
The plots of the non-linear forms of the kinetic models employed are illustrated in Fig. 12, and Table 3 lists the estimated parameter. The PSO model gives the best fit (higher R2 and Adj. R-square values with the lower χ2 values). In addition to that, the experimental and calculated adsorption capacities using this model are closer, suggesting that PSO kinetic model describes the process better. These results indicate that chemisorption occurs in addition to multilayer physical interactions discussed in the isotherm study [51].
The results of the intraparticle diffusion model are given in Fig. 13 and Table 4. In its most general form, the intraparticle diffusion model is represented by three straight-line sections with varying slopes. The steep section is the phase in which the solute and solution move toward the adsorbent’s outer edge coating as a result of external surface adsorption (k1). When a straight line travels through the origin at the rate-limiting stage, the boundary layer control is bypassed, allowing for complete pore diffusion. The gradual section, on the other hand, refers to the solute gradually spreading onto the adsorbent (k2). Finally, the stable section denotes the point where adsorption approaches equilibrium, and the residual solute in the solution is so small that it slows the spread (k3) [52]. Figure 13 and Table 4 show areas with a slight slope and flat sections, implying that border movement outside the adsorbent was instantaneous [53]. Rather, at the rate-limiting step, intraparticle diffusion took place [54].
3.5 Thermodynamic study and general discussion
The values of ΔH° and ΔS° may be computed using the slope and intercept of the plot ln Kd against 1/T (Fig. 14). These values are then used to describe the spontaneity, sorption heat, and randomness at the adsorbent-solution interface (Table 5). The negative value ΔG° implies that the process is spontaneous, while the negative value of ΔH° (− 40.345 kJ/mol) indicates that the process is exothermic; this matter is in the scope of 1–60 kJ/mol, meaning that the process might be regulated by physical sorption [55]. Furthermore, the negative value of ΔS° (− 0.132 kJ/mol.K) implies that the randomness at the solid–liquid interface has decreased.
To summarize, the adsorption mechanism could be managed by chemisorption in addition to multilayer physical sorption, including electrostatic interactions and intraparticle diffusion at the rate-limiting step, according to the obtained results.
In comparison to some adsorbents reported in the literature (Table 6), OP has an average adsorption capacity of 14.15 mg/g with high removal rates (> 90%). However, this biosorbent is green, inexpensive, and requires no chemical or physical modification, whereas others could be relatively expensive and could require complex preparation procedures, large volumes of chemicals, and high energies, making OP suitable for the biosorption of pollutants in liquid media.
4 Conclusion
This work investigated the by-product of olive pomace (OP) as a cost-effective biosorbent to remove BR46 dye. The physicochemical properties of OP were described using XRF, XRD, FTIR, SEM, and pHpzc. The results show that its surface is amorphous, rough, heterogeneous and rich in functional groups, making it an ideal environment for pollutant molecules to be trapped. Adsorption studies were performed in a batch system, and operational factors such as contact duration, solution pH, OP mass, agitation speed, temperature, and starting BR46 concentration were investigated, resulting in high removal rates (> 90%). The Freundlich and the pseudo-second-order models were used to provide the data for the isotherm and the kinetics, respectively. The thermodynamic investigation meant that the adsorption process is spontaneous (ΔG° < 0), exothermic ΔH° (− 40.345 kJ/mol), and most likely physical. In summary, our study implies that the by-product of olive pomace could be developed into a cost-effective and green alternative to remove persisting organic toxins, including the cationic dye BR46.
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Acknowledgements
The authors would like to thank the Algerian Ministry of High Education and the University of Bejaia for the financial support.
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Zahra Graba, Imane Akkari, Nacer Bezzi, and Mohamed Mehdi Kaci: conceptualization, interpretation of results, writing, and editing.
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Graba, Z., Akkari, I., Bezzi, N. et al. Valorization of olive–pomace as a green sorbent to remove Basic Red 46 (BR46) dye from aqueous solution. Biomass Conv. Bioref. 14, 14951–14962 (2024). https://doi.org/10.1007/s13399-022-03639-y
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DOI: https://doi.org/10.1007/s13399-022-03639-y