Adsorptive Removal of Rhodamine B Using Novel Adsorbent-Based Surfactant-Modified Alpha Alumina Nanoparticles

Yen Doan, Thi Hai; Minh Chu, Thi Phuong; Dinh, Thi Diu; Nguyen, Thi Hang; Tu Vo, Thi Cam; Nguyen, Nhat Minh; Nguyen, Bao Huy; Nguyen, The An; Pham, Tien Duc

doi:https://doi.org/10.1155/2020/6676320

Journal of Analytical Methods in Chemistry

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Abstract Introduction Materials and Methods Results and Discussion Conclusions Data Availability Conflicts of Interest References Copyright Related Articles

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Green Analytical Methods and Nanomaterials for Sample Preparation

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Volume 2020 | Article ID 6676320 | https://doi.org/10.1155/2020/6676320

Adsorptive Removal of Rhodamine B Using Novel Adsorbent-Based Surfactant-Modified Alpha Alumina Nanoparticles

Thi Hai Yen Doan,¹Thi Phuong Minh Chu,¹Thi Diu Dinh,¹Thi Hang Nguyen,^1,2Thi Cam Tu Vo,³Nhat Minh Nguyen,³Bao Huy Nguyen,⁴The An Nguyen,⁵and Tien Duc Pham¹

Academic Editor: Pablo Richter

Received06 Oct 2020

Revised25 Nov 2020

Accepted30 Nov 2020

Published09 Dec 2020

Abstract

The objective of the present study is to investigate removal of cationic dye, rhodamine B (RhB), in water environment using a high-performance absorbent based on metal oxide nanomaterials toward green chemistry. The adsorption of sodium dodecyl sulfate (SDS) onto synthesized alpha alumina (α-Al₂O₃) material (M0) at different ionic strengths under low pH was studied to fabricate a new adsorbent as SDS-modified α-Al₂O₃ material (M1). The RhB removal using M1 was much higher than M0 under the same experimental conditions. The optimal conditions for RhB removal using M1 were found to be contact time 30 min, pH 4, and adsorbent dosage 5 mg/mL. The maximum RhB removal using M1 achieved 100%, and adsorption amount reached 52.0 mg/g. Adsorption isotherms of RhB onto M1 were well fitted by the two-step adsorption model. The electrostatic attraction between positive RhB molecules and negatively charged M1 surface controlled the adsorption that was evaluated by the surface charge change with zeta potential and adsorption isotherms. Very high RhB removal of greater than 98% after four regenerations of M1 and the maximum removal for all actual textile wastewater samples demonstrate that SDS-modified nano α-Al₂O₃ is a high-performance and reusable material for RhB removal from wastewater.

1. Introduction

Rhodamine B (RhB) has been commonly used as dyes in the industries such as the printings, textiles, papermaking, paints, and leathers [1–3]. A substantial amount of RhB has been released into the environment, polluting the water and causing danger to the biological systems and human life [4–6]. The characteristics of RhB are similar with other synthetic aromatic dyes which are difficultly eliminated out of water due to the high water solubility and difficultly degraded by the light, the temperature, the chemicals, and the microbes [7, 8]. The removal of RhB is important for the wastewater treatment. The conventional techniques basing on the biochemical, physical, and chemical properties are employed to remove the RhB from aqueous solution which are photocatalytic degradation [9, 10], ion exchange [11, 12], membrane filtration [13], and adsorption [6, 14, 15]. However, these techniques show some disadvantages such as the low efficiency, the long consumption time, and the nonbiodegradable product generations [1]. Some researchers studied photocatalytic degradation of RhB from the industrial effluents under the effective factors of the UV radiation, the temperature, the electron acceptor H₂O₂, pH [10], and the TiO₂ dosage [9, 16], introducing the high removal efficiency, the low cost, and the low consumption time. However, the photocatalytic degradation process is more potential to handle RhB from the pretreated wastewater than the raw one [9]. On the other hand, Goto et al. [17] found that the foam separation is one of the most effective methods to remove zwitterionic RhB from solutions in which RhB was adsorbed onto a the bubble surface of the surfactant anionic sodium dodecyl sulfate. Moreover, adsorption is the most suitable methods to remove RhB from aqueous solution [7, 8, 18]. The activated carbons have widely applied as adsorbents to remove RhB due to its simplicity and efficiency [7, 9, 19]. Recently, the activated carbon has been produced from some diversified natural materials such as the orange peels [2], the chestnut peels [20], the resins [12, 14], the almond shells [19], and the palm shells [21]. However, activated carbon is a high-cost material that is not suitable for developing countries [22]. Therefore, many scientists pay more attention in the development of low-cost adsorbents. The RhB can be removed by raw adsorbents or modified-adsorbents. Qin et al. [23] proved that the Fe₃O₄/RGO composite is more effective for RhB removal than the activated carbon. The authors also found that the RhB adsorption on the composites was 3.7 times higher of the adsorption capacity and 30 times faster of the adsorption rate than that is on the active carbon [23]. Selvam et al. [24] mentioned that the sodium montmorillonite was the available and cheap clay for eliminating dyes. The removal of RhB from the textile effluents was achieved more highly through the adsorption technique using the purified bentonite clays than the natural one due to the smaller diameter particles and the higher proportion of bentonite in the purified clays [25]. The use of the surfactant-modified-substrates to remove RhB has been proved to be more effective in many studies due to the advantages in modifying the surface properties and the essential surface charge [26, 27]. The adsorption isotherms of surfactants onto the oppositely charged surface fast reach to an equilibrium state that is useful to modify the adsorbent surface [28]. The high efficiency of RhB removal from aqueous solution was found to be 83.0% by the adsorption onto the cationic surfactant-modified-bentonite clay at a high pH of 9.0 [26], or 99.3% RhB removal was achieved by using anionic surfactant-modified-zeolite at a pH of 3 [27]. The adsorption kinetics of RhB using various adsorbents followed a pseudo-second-order model [15, 24, 26, 27]. The adsorption kinetics are strongly depended on the substrate surface and the type of surfactant [28].

In our previous research, RhB was completely removed through the adsorption technique using the anion surfactant sodium dodecyl sulfate (SDS) modified-γ-Al₂O₃ [29]. Although, γ-Al₂O₃ has high specific surface area, the α-Al₂O₃ is the most stable form [30]. Also, α-Al₂O₃ is the main component of the natural soil so that a comprehensive study on α-Al₂O₃ is important for further investigation with the real soil. Therefore, the systematically adsorptive removal of RhB using α-Al₂O₃ was used in the present study. The SDS is applied to modify the α-Al₂O₃ surface for RhB removal from the wastewater. The adsorption mechanisms are extensively investigated basing on the charging behaviors of adsorbent and adsorption isotherms. The regeneration of adsorbent and application for RhB removal from actual textile wastewater samples are also studied in this work.

2. Materials and Methods

2.1. Materials

Aluminum nitrate (Al (NO₃)₃·9H₂O) and NaOH pellets, which are analytical reagents, are delivered from Samchun (Korea). Sodium dodecyl sulfate (SDS) (>95% of purify, Wako Pure Chemical Industries, Ltd., Japan) was directly used without further purification as a surface modifier. The critical micelle concentration (CMC) of SDS is measured by the conductometry under different NaCl (p. a, Merck, Germany) concentrations at 22^°C mentioned in somewhere [31]. The stock SDS solution of 0.1 M was prepared for adsorption experiments. Rhodamine B (RhB) was purchased from Merck with a molecular weight of 479.02 g/mol, and the purity > 95% is employed as cationic dye. The chemical structures of SDS surfactants and RhB were described elsewhere [29]. The ionic strength was controlled by adding the suitable volume of 0.1 M NaCl. The salt solution was filtered through a 0.2 μm cellulose membrane before using. The pH solution is adjusted by the addition of HCl and NaOH and measuring by a pH meter (Hanna, Woonsocket city, USA). Ultrapure water with a resistance of 18.2 MΩ.cm used in all experiments was daily produced by an ultrapure water system (Labconco, Kansai, MO, USA).

2.2. Alpha Alumina Synthesis and Modification

Nanosized alpha alumina (α-Al₂O₃) was synthesized by the solvothermal method according to our previously published paper [32]. It should be noted that all alumina forms are transformed to α-Al₂O₃ at a temperature of 1200^°C. Therefore, at the final step, the alumina powder was kept at 1200^°C for 12 h to from α-Al₂O₃ completely before cooling down to room temperature in a desiccator. This material was denoted as M0 adsorbent.

2.3. Modification of α-Al₂O₃ by the SDS Adsorption

Prior to each modification experiment, the α-Al₂O₃ nanoparticles with the size range from about 30 to 40 nm (determined by TEM (transmission electron microscopy)) were vigorously mixed for 2 h by a multiple shaker. Then, the nanoparticles were sonicated for 20 min to eliminate particle aggregation. The α-Al₂O₃ adsorbents were modified by the addition of the appropriate volume of the stock SDS solution. All the adsorption experiments were carried out at pH 6 under the ionic strength condition of 0.01 M NaCl. All samples were thoroughly shaked for 2 h to reach the adsorption equilibrium.

2.4. Adsorptive Removal of RhB Using α-Al₂O₃ and SDS-Modified α-Al₂O₃

The SDS modified α-Al₂O₃ was washed with ultrapure water to remove the excess of SDS and to form M1 adsorbent. The RhB removal using synthesized α-Al₂O₃ (M0) and SDS modified α-Al₂O₃ (M1) was also carried out at room temperature (25 ± 2^oC) under different conditions of pH, contact time, and adsorption dosage. Each adsorptive removal experiment was carried out at least three times. The RhB concentrations were quantified by ultraviolet visible (UV-Vis) spectroscopy at a wavelength of 554 nm using a spectrophotometer (UV-1650 PC, Shimadzu, Japan). The limit of detection (LOD) of UV-Vis spectroscopy for Rh determination was found to be 10⁻⁸ M. The removal (%) of RhB was determined bywhere C_i and C_e are initial and equilibrium concentrations of RhB (mol/L), respectively.

The adsorption capacities of SDS onto M0 and RhB onto M1 were determined bywhere Γ is the adsorption amount of RhB (mg/g), C_i the initial RhB concentration (mol/L), C_e is the equilibrium RhB concentration (mol/L), M is molecular weight of RhB (g/mol), and m is the adsorbent dosage (mg/mL).

The adsorption isotherms of RhB onto M1 were fitted by the two-step model with a general isotherm equation. The general isotherm equation [33] iswhere is the adsorption amount of RhB at concentration C, is the maximum adsorption capacity, and are equilibrium constants for in the first and second step, respectively, and n is cluster of adsorption. C is the equilibrium concentration of RhB.

To evaluate the adsorption mechanisms, the change in surface charge was evaluated by monitoring zeta (ζ) potential. The sample was added into a plastic capillary cell, then inserted in a laser velocimetry setup Zetasizer Nano ZS (Malvern Instruments, UK) under the electric field of 11.3 V/cm. Each measurement was repeated 3 times with 30 subruns. The ζ potential was calculated by Smoluchowski’s equation [34]:where ζ is the zeta potential (mV), ս_e is the electrophoretic mobility (µm cm/V.s), η is the dynamic viscosity of the liquid (mPa. s), ɛ_rs is the relative permittivity constant of the electrolyte solution (F/m), and ɛ₀ is the electric permittivity of the vacuum (8.854 × 10⁻¹² F/m).

3. Results and Discussion

3.1. Adsorption of SDS on the Synthesized α-Al₂O₃ Nanoparticles

The charging behavior of synthesized α-Al₂O₃ nanoparticles (M0) after modifying by SDS in the acid media (pH 5) and the different ionic strengths is represented in Figure 1. It can be seen that the charge sign of M0 changes and even reverses with the adsorption of anionic SDS. The tendency is consistent with the previous research studies in which the adsorption isotherm of the anionic SDS surfactants takes place into four regions or two steps [28, 35]. The zeta potential of M0 significantly decreases with the increment of SDS concentration, passing the isoelectric point (IEP), then moving to the saturated state in which the zeta potential keeps constant. In the first region of the low SDS concentration, the zeta potential of M0 decreases slowly until the neutral net charge due to the simple main electrostatic interactions between the anionic surfactants and oppositely charged alumina particles at pH 5. There is a sudden decrement of potential shown in the second region due to the surfactant aggregation on the α-Al₂O₃ surface which is well-known as hemimicelles. The repulsions between SDS surfactants are shielded by the presence of electrolyte ions combining with the hydrocarbon chain forces, resulting in forming the SDS aggregates. In the third region, the surfactant aggregates continue to develop. In the last region, the zeta potential does not change beyond the critical micelle concentration (CMC).

The effect of ionic strength on the SDS adsorption onto α-Al₂O₃ nanoparticles is clarified. The potential of M0 after adsorbing different concentrations of SDS was measured at pH 5 and under two ionic strength conditions. It is shown that at the fixed SDS concentration, the zeta potential of α-Al₂O₃ nanoparticles decreases with an increment of the ionic strength from 0.1 to 10 mM of NaCl. The SDS adsorption increased with increasing the NaCl concentration. The electrolyte ions shield not only the electrostatic forces between anionic SDS surfactants and oppositely charged alumina nanoparticles but also the repulsive forces between SDS surfactant molecules/or between the hemimicelles [36]. Herein, the later effect is stronger than the former one, resulting that more SDS surfactants adsorbed and formed the bilayer of admicelles on the M0 surface [31, 37]. Therefore, the surface charge of α-Al₂O₃ remained the highly negatively charged that is useful to remove cationic dye RhB. The use of 0.006 M SDS at 10 mM NaCl is suitable to form SDS-modified α-Al₂O₃ (M1) material.

3.2. Adsorptive Removal of RhB Using Different Adsorbents

3.2.1. Effect of pH

The pH solution is one of the most important parameter influences to RhB removal using M0 and M1 materials. The pH solution strongly influences to the surface charge of adsorbent M0 and the desorption of SDS for modified adsorbent M1 [31, 38]. The influence of pH on RhB removal using M0 and M1 was carried out from pH 3 to 10 at 1 mM NaCl using adsorbent dosage of 5 mg/mL, with a contact time of 30 min (Figure 2).

Figure 2 shows that the RhB removal using M0 material did not change significantly except for pH 4 in pH range of 3–10 while the RhB removal reduced with an increase of pH from 3 to 10 when using M1 material. At pH 3, α-Al₂O₃ may dissolve into solution so that the error bars show the standard deviations were high for M1 [39]. It should be noted that the M0 surface charge decreases with increasing pH but the net charge density of M0 is small. Since RhB is positive charged in the pH range so that RhB removal using M0 was rather low (around 25%). For M1 material, the SDS desorption enhanced with increasing pH so that the net negative charge of M1 decreased [38]. In all pH ranges, the RhB removal using M1 was much higher than that using M0 under the same experimental conditions. Figure 2 also indicates that the RhB removal achieved 95.2 and 32.7% at pH 4 when using M1 and M0 materials, respectively. Thus, we kept pH 4 for further investigation on RhB removal using both M0 and M1 materials.

3.2.2. Effect of Adsorbent Dosage

For adsorption technique, binding site and specific surface area highly affect the removal efficiency because they can change the surface charge density of adsorbent [40]. The amounts of M0 and M1 materials were changed from 0.5 to 30 mg/mL (Figure 3). Figure 3 shows that the RhB removal using M0 and M1 materials increased with increasing adsorbent dosage but the RhB removal using M1 achieved the highest efficiency with very small amount of adsorbent. The adsorbent dosage 5 mg/mL is suitable to get the removal approximately 100% for M1 while the RhB removal using M0 was only 26% with such adsorbent dosage. Thus, optimal adsorbent dosage for M1 was 5 mg/mL.

Because the RhB removal using M1 was extremely higher that using M0, further studies only investigate on the adsorption of RhB onto M1 material.

3.2.3. Effect of Contact Time

Contact time is known as the time from initial mixing RhB with adsorbent. The RhB removal using M1 in the contact time range of 0–180 min is shown in Figure 4.

Figure 4 shows that the contact time for RhB removal using M1 reached the equilibrium with only 30 min. This time is much faster than RhB adsorption on well-known adsorbent as activated carbon (120 min) [41]. Therefore, contact time of 30 min was fixed for RhB removal using M1 material.

3.3. Adsorption Mechanisms of RhB onto Synthesized α-Al₂O₃ Nanoparticles with SDS Modification (M1)

Adsorption isotherms are important to understand adsorption mechanisms of RhB onto synthesized α-Al₂O₃ nanoparticles with SDS modification (M1). Figure 5 shows that at acid media (pH 4), the adsorption of RhB at low ionic strength was always higher than at high ionic strength. At high NaCl concentration, the total counter ions are high that can screen the surface charge of M1. As a result, the net negative charge of M1 increased (see Figure 1) while the electrostatic attraction between cationic RhB and negatively charged M1 surface was decreased. We suggest that RhB adsorption onto M1 is mainly controlled by electrostatic attraction and effect of ionic strength on RhB adsorption is important.

As can be seen in Figure 5, the data point represented that experimental results of RhB adsorption onto M1 were in accordance with a two-step adsorption model using the fit parameters in Table 1. Table 1 and Figure 5 show that the plateau RhB adsorption at 1 mM NaCl was higher than at 10 mM. Interestingly, the same fit parameters of k₂ and n could be used for two isothermal adsorptions at 1 and 10 mM NaCl. Nevertheless, the k₁ at 1 mM NaCl was slightly higher than k₁t at 10 mM. It implies that the k₁ can be useful to predict the electrostatic interaction of RhB adsorption onto SDS-modified α-Al₂O₃ nanoparticles. The maximum adsorption capacity of RhB using M1 materials was found to be 52 mg/g that was much higher than many reported adsorbents [42].

To confirm the adsorption mechanism, the charging behavior of α-Al₂O₃ nanoparticles before and after adsorption was considered. Figure 6 indicates that the ζ potential of synthesized α-Al₂O₃ was about +23.0 mV at pH 5. The charge reversal was taken place after SDS adsorption so that a negative charge of M1 was achieved (ζ = - 53.1 mV). Due to the presence of admicelles with local bilayer onto α-Al₂O₃ surface, the surface charge of α-Al₂O₃ was highly negative. [31, 38]. However, after RhB adsorption, a small positive of ζ was obtained. The change of ζ potential indicates that RhB adsorption onto M1 material was controlled by electrostatic interaction that agrees well with the results of adsorption isotherms. In other word, we can demonstrate that electrostatic is the main driving force that induces RhB adsorption onto SDS-modified α-Al₂O₃ nanoparticles.

3.4. The Reuse Potential and the Application of SDS-Modified Nano α -Al₂O₃

The reuse potential of material is needed to examine the stability and regeneration of M1 adsorbent. The M1 absorbent was regenerated by using 0.1 M NaOH. Figure 7 shows the RhB removal after regeneration cycles. It is clear to observe that the RhB removal changed insignificantly after four regenerations. The RhB removal was still higher than 98%, indicating that M1 adsorbent-based SDS-modified nano α -Al₂O₃ was highly reusable and high performance of RhB removal.

The application M1 adsorbent in wastewater samples is important to evaluate the performance of adsorbent. The wastewater samples of a textile company in the Pho Noi industrial zone in Hung Yen Province, Vietnam, were collected at three different discharged locations and analyzed in the same day. Then, the textile samples were centrifuged to remove the solids and the solutions were collected. RhB in each textile wastewater sample was removed under optimal conditions. Table 2 shows the RhB removal from three wastewater samples using M1 adsorbent. Although the RhB removal is strongly influenced by many factors in actual samples, the RhB removal in all samples reached about 100%. Our results again indicate that SDS-modified nano α-Al₂O₃ is a high-performance adsorbent for the cationic dye removal from wastewater.

4. Conclusions

We have reported a scientific research on the RhB removal using synthesized α-Al₂O₃ nanomaterial with surface modification by anionic surfactant SDS. The RhB removal using SDS-modified α-Al₂O₃ was much higher than raw α-Al₂O₃. The suitable parameters for RhB removal using SDS-modified α-Al₂O₃ were contact time 30 min, pH 4, and adsorbent dosage 5 mg/mL. The maximum adsorption capacity of RhB was found to be 52.0 mg/g while the removal reached 100%. Adsorption isotherms of RhB onto SDS-modified α-Al₂O₃ were in accordance with the two-step adsorption model. Based on the change in surface charge monitoring by zeta potential and adsorption isotherm, we indicate that electrostatic attraction was the main driving force induced adsorption. The SDS-modified α-Al₂O₃ is reusable adsorbent for RhB removal with very high efficiency of greater than 98% after four regeneration cycles while the RhB removal using the this adsorbent reached to about 100% for actual textile wastewater.

Data Availability

The data and supporting materials are included within the article.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.

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Copyright © 2020 Thi Hai Yen Doan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Journal of Analytical Methods in Chemistry

Green Analytical Methods and Nanomaterials for Sample Preparation

Adsorptive Removal of Rhodamine B Using Novel Adsorbent-Based Surfactant-Modified Alpha Alumina Nanoparticles

Abstract

1. Introduction

2. Materials and Methods

2.1. Materials

2.2. Alpha Alumina Synthesis and Modification

2.3. Modification of α-Al2O3 by the SDS Adsorption

2.4. Adsorptive Removal of RhB Using α-Al2O3 and SDS-Modified α-Al2O3

3. Results and Discussion

3.1. Adsorption of SDS on the Synthesized α-Al2O3 Nanoparticles

3.2. Adsorptive Removal of RhB Using Different Adsorbents

3.2.1. Effect of pH

3.2.2. Effect of Adsorbent Dosage

3.2.3. Effect of Contact Time

3.3. Adsorption Mechanisms of RhB onto Synthesized α-Al2O3 Nanoparticles with SDS Modification (M1)

3.4. The Reuse Potential and the Application of SDS-Modified Nano α -Al2O3

4. Conclusions

Data Availability

Conflicts of Interest

References

Copyright

2.3. Modification of α-Al₂O₃ by the SDS Adsorption

2.4. Adsorptive Removal of RhB Using α-Al₂O₃ and SDS-Modified α-Al₂O₃

3.1. Adsorption of SDS on the Synthesized α-Al₂O₃ Nanoparticles

3.3. Adsorption Mechanisms of RhB onto Synthesized α-Al₂O₃ Nanoparticles with SDS Modification (M1)

3.4. The Reuse Potential and the Application of SDS-Modified Nano α -Al₂O₃