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The Photocatalytic Application of Semiconductor Stibnite Nanostructure Synthesized via a Simple Microwave-Assisted Approach in Propylene Glycol for Degradation of Dye Pollutants and its Optical Property
Nanoscale Research Letters volume 12, Article number: 589 (2017)
Stibnite (Sb2S3) semiconducting material was successfully synthesized by a rapid and facile microwave route using antimony chloride (SbCl3) and sodiumthiosulfate (Na2S2O3) dissolved in propylene glycol (PG) containing different hydroxyethyl cellulose (HEC) masses. The phase identification, morphology, and elemental composition of products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field- emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The results revealed the orthorhombic phase of Sb2S3 single crystal-forming sheaf-like nanostructure, and a possible formation mechanism was proposed and discussed. Its direct band gap calculated from UV-visible absorption is 1.60 eV. In this research, the photocatalytic activities of Sb2S3 nanostructure were investigated through the degradation of methyl orange (MO) and methylene blue (MB) under visible light irradiation. The as-obtained 0.30 g HEC-added solution (0.3 HEC-Sb2S3) photocatalyst exhibited better photocatalytic activity than the other products, which degraded 91% of MO within 300 min and 90% of MB within 240 min under the Xe-lamp irradiation. The first-order plot was fitted with this experiment which the rate constant (k) of 0.3 HEC-Sb2S3 for MO and MB degradation are 0.0085 and 0.0098 min−1, respectively. Therefore, the new experience with a novel and simple synthetic procedure of Sb2S3 photocatalyst that exhibits the characteristics of a highly effective photocatalyst under visible light irradiation was discovered.
Presently, the photocatalytic activity of semiconductor nanomaterial has drawn considerable interest worldwide because they have significant potential for the degradation of dye pollutants in wastewater and elimination of environmental contaminations. A serious problem with toxic synthetic dyes was arisen from discharging the wastes of textile, paper, and plastic industries. Consequently, it is necessary to treat these dye pollutants in water before draining to natural resources.
Typically, a variety of procedures have been used for removal of synthetic dyes from water, including membrane separation, microbiological decomposition, adsorption, and photocatalysis [1,2,3,4,5,6,7]. Among them, the most potential method with a high efficiency is using photocatalytic material for dye degradation . Over the last 10 years, semiconductor photocatalyst has grown significantly. A primary focus on TiO2 has been applied to environmental problems, due to it has traditionally formed as photocatalyst under irradiation for pollutant degradation by generating strong oxidants such as HO• radicals that can rapidly and non-selectively degrade organic compounds . Other types of semiconductors such as ZnO, α-Fe2O3, CdS, ZnS, ZnO-SnO2, CeO2-TiO2, and Ag3PO4 composite were also used as photocatalyst because of their optimum optoelectrical, physical, and chemical properties . A variety of approaches have been developed to prepare the unique structure of semiconductor nanostructures such as one-dimensional nanostructures due to their low number of grain boundaries, rapid charge transfer dynamics, and high specific area can improve the photocatalytic performance [9, 11,12,13,14,15]. In recent years, there are a number of processes used to synthesize photocatalysts with different morphologies: hydrothermal routes to synthesize ZnO-SnO2 hollow spheres , α-Fe2O3 hollow spheres , α-Fe2O3 nanospindles, nanotubes, and nanotires , and CeO2-TiO2 nanobelt heterostructures ; microwave-assisted sol-gel method to synthesize N-Cu-activated carbon (AC)/TiO2 nanoparticles  and carbon-based (N,Fe)-codoped TiO2 nanoparticles ; and a combined chemical vapor deposition (CVD) technique and hydrothermal route to prepare Ag3PO4/CNFs/silica-fiber hybrid composites .
Previously, the pure TiO2 photocatalyst can only absorb ultraviolet light, due to its large band gap (3.0–3.2 eV) . To solve these problems, numerous strategies have been studied to reduce the charge recombination and enhance visible light utilization of photocatalysts. Chalcogenide semiconductor photocatalyst is one of the promising materials that has been found to mark enhancement of the photocatalytic activity in the visible region because of its narrow band gap [19,20,21,22].
Recently, chalcogenide photocatalysts can play an important role in the degradation of dyes, such as In2S3 used for MB photocatalytic degradation under visible irradiation ; SnS, Sn2S3, and SnS2 quantum dots were studied for the photocatalytic degradation of MB ; the photocatalysis of Sb2S3 nanowires was investigated for the degradation of MO ; SnS microstructure was used for the photocatalytic degradation of Rhodamine B (RhB) under sunlight .
Herein, semiconducting photocatalysts of main group metal chalcogenide A2X3 (A = As, Sb, Bi; X = S, Se, Te), such as Sb2S3 or stibnite, have been studied intensively due to their numerous applications including optoelectronic, thermo-electric technologies, solar energy utilization, and semiconducting photocatalyst [23,24,25]. Different approaches were used for synthesizing of Sb2S3: refluxing , spray pyrolysis , hydrothermal process , and microwave-assisted synthesis . In this research, microwave-assisted synthesis in a facile solution-phase method was used for synthesizing Sb2S3. This method has a lot of benefits: very simple, effective, low cost, fast, and precise control of the reaction (mixing condition and size and shape controlling) [11,12,13, 27]. The results show that this method has high potential and reproducibility. Thus, it is one of the most promising techniques used for controlling the morphology of products. In addition, the photocatalytic activities were also evaluated through the degradation of methyl orange (MO) solution and methylene blue (MB) solution under visible light irradiation.
Preparation of Sb2S3 Photocatalysts
All chemicals used in this experiment were analytical grade and used without further purification. To synthesize Sb2S3, each of 2 mmol of antimony chloride (SbCl3, assay: 99.0%, Sigma-Aldrich) and 3 mmol of sodium thiosulfate (Na2S2O3, ≥ 99.0%, Sigma-Aldrich) was dissolved in 30 mL propylene glycol (PG, assay: 99.5%, QRëC). They were thoroughly mixed, followed by pH adjusting to 4 using 0.1 M HCl (diluted from concentrated HCl (37% v/v), Sigma-Aldrich), and stirred for 15 min. Then, 0.10, 0.20, and 0.30 g of HEC (Mw ~ 250,000, Sigma-Aldrich) were added to the mixed solutions and irradiated with microwave radiation at 300 W for 20 min to form 0.1 HEC-Sb2S3, 0.2 HEC-Sb2S3, and 0.3 HEC-Sb2S3 products, respectively. The as-obtained product appears as black precipitates which were separated by filtration, washed with absolute ethanol, and dried at the 70 °C for 24 h, for further characterization. For the present synthesis, different contents of hydroxyethyl cellulose (HEC) were also used as a template.
Characterization of Photocatalysts
Phase and purity were characterized by an X-ray diffractometer (XRD, SIEMENS D500) operating at 20 kV and 15 mA and using Cu-Kα line in 2θ range of 10–60 deg. Shape, size, and composition of the precipitates were investigated by a field-emission scanning electron microscope (FE-SEM, JEOL JSM-6335F) equipped with an energy dispersive X-ray (EDX) analyzer operating at 15 kV, a transmission electron microscope (TEM, JEOL JEM-2010), a selected area electron diffractometer (SAED) operating at 200 kV, and Fourier transform infrared spectroscopy (FTIR). The optical property was studied by a UV-visible spectrometer (Lambda 25, PerkinElmer) using a UV lamp with a resolution of 1 nm.
Measurement of Photocatalytic Activity
The photocatalytic activities of Sb2S3 nanostructure were evaluated by MO (C14H14N3NaO3S) and MB (C16H18ClN3S) degradation under visible light irradiation. A 300-W Xe lamp equipped with a 420-nm cut-off filter was used as a visible light source. Practically, 30 mg of the photocatalyst was dispersed in a 100 mL of 11 mg L−1 MO solution and 100 mL of 10 mg L−1 MB solution, respectively. Prior to irradiation, the dye solution was continuously stirred for 1 h in the dark for adsorption-desorption equilibrium. Then, the visible light was turned on to start photocatalysis. During the process, 3 mL of suspension was withdrawn every a certain time interval and centrifuged to precipitate the photocatalyst. The absorbance of the clear solution or the change of MO and MB concentration were determined by UV-visible spectrophotometer (PerkinElmer, Lambda 25) using the maximum absorbance at 464 and 665 nm, respectively. The photocatalytic efficiency of MO and MB degradation was calculated using the formula
where C 0 is the initial concentration of MO or MB concentration and C is the concentration of MO or MB after visible light irradiation within the elapsed time (t).
Results and Discussion
Phase and Morphology Analysis
The crystalline degree and phase purity of Sb2S3 crystal were shown in Fig. 1 which have been characterized by an X-ray diffractometer (XRD). At 300 W of microwave power, the XRD results revealed the pure phase of Sb2S3 with Pbnm space group, in accordance with the JCPDS File no. 06-0474 . All the diffraction peaks can be readily indexed to an orthorhombic phase of stibnite. Upon increasing the mass of HEC, the XRD peak turned into sharper and higher intensity, implying that the crystalline degree was improved—in accordance with the good order of the lattice atom reported by Thongtem et al. . In this research, the highest content of HEC-added solution was 0.30 g due to the problem in the synthesis of Sb2S3 in PG is very viscous, and the delay of kinetic control can cause agglomeration due to inefficient physical mixing .
To reveal the shape and size of the as-obtained Sb2S3, Fig. 2 is a set of SEM images which show the development of Sb2S3 morphologies in different contents of HEC-added solutions. There are a number of nanorods with irregular shape in the HEC-free solution. When 0.10 g HEC was added to the mixed solution, it caused each nanorod to split more to be a bundle of nanorods. A bundle of nanorod was enlarged and more open at their end tips in 0.20 g HEC-added solution. Finally, the Sb2S3 morphology was changed into a sheaf-like structure and more beautiful in 0.30 g HEC-added solution. The present morphology is similar to the report by Ota et al.  who started the straw tide-like morphology with 18-h reaction time synthesized by hydrothermal. Previously, the straw-bundled-like nanorods were synthesized in 1,4-butanediol using polyvinylpyrrolidone (PVP) as surfactant via refluxing polyol process for 30 min as reported by Zhang et al. . But for this work, the sheaf-like structures were successfully synthesized by microwave-assisted synthesis for 20 min, spends less reaction time than the previous researches.
TEM image, SAED, and simulated patterns  of Sb2S3 synthesized in 0.30 g HEC-added solution (0.3 HEC-Sb2S3) are illustrated in Fig. 3. Each individual nanorod growing along the  direction —in accordance with the growth direction identified by Ota et al. , Kavinchan et al. , and Wang et al. . The SAED pattern shows a systematic array of white spots of orthorhombic phase of Sb2S3 single crystal, corresponding to the diffraction pattern obtained by simulation .
Quantification of the EDX spectrum (Fig. 4) of 0.3 HEC-Sb2S3 product provides close to 2:3 atomic ratio of Sb:S—in good accordance with the stoichiometric composition of Sb2S3. It should be noted that other peaks were also detected—caused by the electronic transition of copper stub and carbon tape used for holding the analyzed sample .
Energy Gap Analysis
Figure 5 shows the photonic absorbance attenuating through the Sb2S3 nanorods. The absorption was controlled by two photon energy (hν) ranges, corresponding to the high and low energies. When photon energy is greater than the energy band gap (E g ), the absorption was linearly increased with the increase in photon energy. This research shows the (αhν) 2 and (hν) plot for direct allowed transition, where α is the total absorption coefficient, h is the Plank constant, and ν is the photonic frequency . The band gap energy of Sb2S3 is therefore estimated to be 1.60 eV, in accordance with 1.59–1.60 eV of Sb2S3 determined by Alonso et al.  compare to those products reported by other researchers, such as the 1.52 eV prepared by Zhu et al. , 2.08 eV by Ota et al. , and 2.27 eV by Chate et al. . The band gap of this report is less than 1.80 eV of flower-like and 2.08 eV of Sb2S3 nanorods determined by Ota et al.  and 2.27 eV of thin film Sb2S3 calculated by Chate et al. . This analysis implies that the Sb2S3 nanostructure has the potential to absorb visible light and can be used for solar-light-driven applications and optical nanodevices [22, 35, 37].
A Possible Mechanism of Sb2S3 Formation and Simulation
A possible formation mechanism of Sb2S3 was controlled by hydrolytic decomposition of sodiumthiosulfate as a sulfur source. First, antimony (III) ions (Sb3+) in the solution formed complexes with thiosulfate. In the mixed solution containing Sb3+ and S2− at pH 4 as an acidic medium, thiosulfate ions slowly released sulfide ions to combine with antimony (III) ions, and colloidal complexes formed. Finally, the black precipitates of Sb2S3 were synthesized. Moreover, the concentration of Sb3+ and S2− ions in the solution also played the role in the formation rate of Sb2S3 [36, 38].
Figure 6 illustrates Sb2S3 structure obtained by simulation. It shows that the infinite chains of stoichiometric composition of atoms run normal to the axis. The binding force of the chain in b direction is greatly weaker than the one along the chain (a- and c-axis) [29, 39]. The cleavage can easily occur in the (010) plane—caused by the binding between these chains—and is considerably weaker than that within the chains. Thus, the growth direction is preferential along the  direction . The crystal splitting is also associated with fast crystal growth, due to the super saturation that exceeds a certain critical value [26, 39, 40]. In this work, HEC was used as a soft template and capping agent—composed of long macromolecules with a number of hydroxyl groups. The chain molecules were entangled nuclei in liquid medium to form very tiny particles with active site on the surfaces. Consequently, the crystals grew out of active sites and HEC molecules adsorbed on the side walls of the crystals —resulting the products to become lengthy and more beautiful in 0.30 g HEC-added solution. The crystal splitting is also associated with the sudden crystal growth, due to the saturated solution exceeding a certain critical value [39, 40]. Comparing the previous researches, nanorods synthesized using sodium dodecyl sulfate (SDS) as a surfactant by Ota et al. , the double flower-like microcrystal using dodecyltrimethylammonium bromide (DTAB) as a surfactant by Wu et al. , the dumb-bells using polyvinylpyrrolidone as a template by Kavinchan et al. , and nanowires using polyethylene glycol with molecular weight of 6 kDa (PEG-6000) by Wang et al. , the present sheaf-like structures synthesized using HEC as capping agent are more beautiful—affected by the stability and reliability of using polymers as templates .
Figure 7 shows the absorption spectra of MO solution using Sb2S3, 0.1 HEC-Sb2S3, 0.2 HEC-Sb2S3, and 0.3 HEC-Sb2S3 products (Fig. 7a–d) as photocatalyst, respectively. The degradation efficiency of MO solution (Fig. 8a, b) was 79% within 300 min by using Sb2S3 whereas the degradation efficiency of MO was gradually increased, which correspond to 80, 86, and 91% at the same time by using 0.1 HEC-Sb2S3, 0.2 HEC-Sb2S3, and 0.3 HEC-Sb2S3 photocatalysts, respectively—influenced by the more uniform as-prepared product with good crystallinity and the large surface area . Compared to the MO degradation efficiency (71% within 150 min) of Sb2S3 nanowires reported by Zhang et al. , the MO degradation efficiency of this work (75% within 150 min) is more. The first-order plot was fitted with this experiment, and rate constant of MO degradation was obtained by the following equation
where C o is the initial concentration at time t = 0, C is the concentration at time t, k is the first-order rate constant, and t is the irradiation time. As can be observed in Fig. 8c, the computed rate constants for Sb2S3, 0.1 HEC-Sb2S3, 0.2 HEC-Sb2S3, and 0.3 HEC-Sb2S3 photocatalysts were gradually increased which were 0.0052, 0.0053, 0.0068, and 0.0085 min−1, respectively for the MO degradation.
The absorption spectra of MB solution using Sb2S3, 0.1 HEC-Sb2S3, 0.2 HEC-Sb2S3, and 0.3 HEC-Sb2S3 as photocatalyst were shown in Fig. 9. The photocatalytic activities and the first-order plot of MB degradation are shown in Fig. 10. The degradation efficiency of MB solution was 82% by using Sb2S3, compared to using 0.1 Sb2S3-HEC, 0.2 Sb2S3-HEC, and 0.3 Sb2S3-HEC as photocatalyst, the degradation percent were respectively calculated to be 84, 87, and 90% within 240 min. The results show that photocatalytic activities of 0.3 HEC-Sb2S3 have the highest degradation efficiency of all samples in both of MO and MB solution, due to its large specific surface area of nanorods that can promote the electron-hole separation on surface area and increase the photocatalytic reaction site [14, 42]. The calculated first-order rate constants (Fig. 10c) were 0.0076, 0.0080, 0.0087, and 0.0098 min−1 for Sb2S3, 0.1 HEC-Sb2S3, 0.2 HEC-Sb2S3, and 0.3 HEC-Sb2S3, respectively. These results indicate that 0.3 HEC-Sb2S3 photocatalyst was more efficient in MB degradation than MO degradation—due to an equal degradation efficiency close to 90% on MB and MO but the MB degradation time less than MO solution. The results reveal the rate constant (k) of 0.3 HEC-Sb2S3 for MO (0.0085 min−1) and MB (0.0098 min−1) solution were higher than the other samples—caused by the good crystallinity and the large surface area of the product [21, 42].
Figure 11 shows the FTIR spectra in the range of 500–4000 cm−1. As can be seen in Fig. 11a, the peaks at 1010, 949, and 599 cm−1 correspond to the bonds of metallic compounds and M–OH modes of product [43,44,45]. The absorption peaks around 3400 and 1600 cm−1 related to the stretching and bending vibration of O–H bond, respectively [44,45,46]. The peaks between 1100 and 1500 cm−1 are in accordance with the C–H stretching band. Figure 11b shows the peaks at 1368, 1260, 1118, and 1006 cm−1 of 0.3 HEC-Sb2S3 adsorbed by MO sample were attributed to the C–N vibrations, C–N aromatic stretching vibrations, the vibration of C–N bonds, and C–H in-plane bending vibration of benzene rings of MO molecules, respectively [9, 14, 47]. Figure 11c shows the peak at 1010 cm−1 of 0.3 HEC-Sb2S3 adsorbed by MB was broadened compare to 0.3 HEC-Sb2S3—caused by the bonding with 0.3 HEC-Sb2S3 and MB molecules [45, 46]. Moreover, the rather strong peak at 949 cm−1 can be attributed to modes form as a result of H-bond of the type Nhet ··· HO (stretching heterocycle··· HO) . These were obtained from hydrogen bonds between the heterocyclic N atoms of MB molecules and water H of Sb2S3 surfaces [46, 48]. These results indicated that MO molecules act as the anion in aqueous solution may be absorbed on the surface of photocatalyst—causing the peaks of MO molecules on FTIR spectra. On the other hand, MB act as the cation in the aqueous solution that can be interacted with the hydroxyl (–OH) group on the surface area of the photocatalyst—causing the peak at 1010 cm−1 to decrease after adsorption [43,44,45,46,47,48].
Possible Photocatalytic Mechanism
Figure 12 shows the MO and MB degradation mechanism induced by Sb2S3 nanostructure. During the photocatalytic process, electrons and holes reacted with the adsorbed substances (O2 and OH−) on the surfaces of crystals to form oxidative radicals such as O2 •− and •OH [49,50,51] when irradiation energy is equal to or higher than its energy band gap (1.60 eV for 0.3 HEC-Sb2S3) [21, 51]. Then, the MO and MB organic molecules were destroyed and efficiently degraded to form H2O and CO2 molecules as the final products [10, 52,53,54].
In summary, a sheaf-like Sb2S3 nanostructure composed of a number of nanorods act as the visible-light-driven photocatalyst was successfully synthesized by a simple microwave radiation. The purpose of this work was to gain new experience with a simple synthetic procedure of Sb2S3 photocatalyst that has a high degradation efficiency. The first-order plot was fitted with this experiment. The as-obtained 0.3 HEC-Sb2S3 photocatalyst exhibited better photocatalytic activity than the other products, which degraded 91% of MO within 300 min and 90% of MB within 240 min under the Xe-lamp irradiation. The 0.3 HEC-Sb2S3 product is beneficial to the photodegradation of the MO and MB dye. It may be mainly attributed to its band gap (E g = 1.60 eV), which cover range of the solar spectrum and has strong absorption of the visible light. Consequently, these results suggest that the as-prepared 0.3 HEC-Sb2S3 product exhibits a good photocatalytic activity under the visible light irradiation and it is one of the promising photocatalytic materials for wastewater treatment.
Chemical vapor deposition
Energy dispersive X-ray
Field-emission scanning electron microscopy
Fourier transform infrared spectroscopy
- Rh B:
Selected area electron diffraction
Sodium dodecyl sulfate
Transmission electron microscopy
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This work was supported by the revenue budget in 2017, School of Science, University of Phayao (SC08/2560) and Chiang Mai University through the Center of Excellence in Materials Science and Technology.
The authors declare that they have no competing interests.
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Saksornchai, E., Kavinchan, J., Thongtem, S. et al. The Photocatalytic Application of Semiconductor Stibnite Nanostructure Synthesized via a Simple Microwave-Assisted Approach in Propylene Glycol for Degradation of Dye Pollutants and its Optical Property. Nanoscale Res Lett 12, 589 (2017). https://doi.org/10.1186/s11671-017-2356-6
- Microwave-assisted synthesis
- Sb2S3 nanostructure
- Energy gap
- Photocatalytic activity