Solvothermal Synthesis of Zn<sub>2</sub>SnO<sub>4</sub> Nanocrystals and Their Photocatalytic Properties

Sun, Guang; Zhang, Saisai; Li, Yanwei

doi:https://doi.org/10.1155/2014/580615

International Journal of Photoenergy

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Structurally and Elementally Promoted Nanomaterials for Photocatalysis

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Volume 2014 | Article ID 580615 | https://doi.org/10.1155/2014/580615

Solvothermal Synthesis of Zn₂SnO₄ Nanocrystals and Their Photocatalytic Properties

Guang Sun,¹Saisai Zhang,¹and Yanwei Li¹

Academic Editor: Lei Liu

Received22 Jan 2014

Revised16 Feb 2014

Accepted17 Feb 2014

Published23 Mar 2014

Abstract

Crystalline Zn₂SnO₄ nanoparticles were successfully synthesized via a simple solvothermal route by using Zn(CH₃COO)₂·2H₂O and SnCl₄·5H₂O as source materials, NaOH as mineralizing agent, and water and ethanol as mixed solvents. The used amount of NaOH was found to have an important influence on the formation of Zn₂SnO₄. When the molar ratio of OH⁻ : Zn²⁺ : Sn⁴⁺ was set in the range from 4 : 2 : 1 to 8 : 2 : 1, Zn₂SnO₄ nanoparticles with different shape and size were obtained. However, when the molar ratio of OH⁻ : Zn²⁺ : Sn⁴⁺ was set as 10 : 2 : 1, a mixture phase of ZnO and ZnSn(OH)₆ instead of Zn₂SnO₄ was obtained. Photodegradation measurements indicated that the Zn₂SnO₄ nanoparticles own better photocatalytic property to depredate methyl orange than the Zn₂SnO₄ nanopolyhedrons. The superior photocatalytic properties of Zn₂SnO₄ nanoparticles may be contributed to their small crystal size and high surface area.

1. Introduction

In recent years, metal oxide semiconductors (MOSs) have been paid more and more attentions due to their diverse function and promising application in various fields. Among these MOSs, besides the widely studied binary oxides such as ZnO [1], SnO₂ [2], TiO₂ [3], and Fe₂O₃ [4], the ternary MOSs, including Zn₂SnO₄ and ZnSnO₃, have also been investigated [5, 6]. Stimulated by the prominent morphology (shape and size) dependent physical and chemical properties of nanostructured MOS, many researchers have devoted their efforts to the design and synthesis of MOS nanostructures. Up to now, a variety of nanostructures, such as zero-dimensional nanoparticles, one-dimensional nanowires, nanorods and nanotubes, two-dimensional nanosheets, and three-dimensional hierarchical micro/nanostructures that assembled with low dimensional nanobuilding blocks, have been synthesized and investigated. However, it is still a meaningful and important work to develop facile and feasible techniques for the synthesis of MOS nanomaterials with controlled shape and size in the field of nanoscience and nanotechnology.

Zn₂SnO₄, as an important ternary MOS, is a typical n-type semiconductor with the band-gap of 3.6 eV. Because of its high chemical sensitivity, low visible absorption, and excellent optical electronic properties, Zn₂SnO₄ has many promising applications in gas sensors [5, 7, 8], solar cells [9, 10], photocatalysts [11–15], and negative materials for rechargeable lithium ion batteries [16, 17]. Driven by these potential applications, an increasing research interest has focused on the synthesis of Zn₂SnO₄. In order to achieve Zn₂SnO₄, some traditional high-temperature techniques are usually employed, including high-temperature solid-reaction between solid ZnO and SnO₂ [18, 19], thermal evaporation method by heating metal or metal oxides at high temperature [20–23], and the chemical vapor deposition methods [24]. However, these reported methods are usually of high energy consumption, and thus not suitable for practical production in industry from the view point of environment protection. Recently, hydrothermal synthesis methods have been successfully developed to prepare Zn₂SnO₄ [5, 11, 25–29]. Compared with the high-temperature synthesis methods mentioned above, the hydrothermal synthesis method has the merits of low cost and being friendly to environment and is thus considered as one of the most promising methods that can be applied in practical production. Up to now, various micro/nanostructures of Zn₂SnO₄ have been synthesized by hydrothermal methods, such as nanowires [23, 24, 29], nanorods [28], irregular particles [17], well-defined polyhedra [22, 30], and hierarchical cube-like microstructures assembled with nanoplates [8]. As an evolution method of hydrothermal synthesis, the solvothermal synthesis is also an important wet chemical synthesis method that can be used to fabricate MOS nanostructures. However, compared with the widely reported hydrothermal synthesis methods for Zn₂SnO₄, few reports are about the synthesis of Zn₂SnO₄ nanostructure via solvothermal method.

In this paper, a simple and efficient solvothermal route was developed to synthesize crystalline Zn₂SnO₄ nanoparticles by using water and ethanol as mixed solvents. The prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier infrared spectroscopy (FTIR), and nitrogen-sorption techniques. It was found that the crystallinity, particle size, and shape of Zn₂SnO₄ are strongly dependent on the amount of alkali. The photocatalytic properties of the prepared Zn₂SnO₄ were investigated by photodegradation of methyl orange dye. Results indicated that the irregular Zn₂SnO₄ nanoparticles own better photodegradation capacity than Zn₂SnO₄ nanopolyhedrons perhaps due to their smaller crystal size and higher surface area.

2. Experimental Section

2.1. Synthesis of the Zn₂SnO₄

All of the chemical reagents were analytical grade and used as received without further purification. In this paper, Zn₂SnO₄ was prepared via a simple solvothermal method by using Zn(CH₃COO)₂·2H₂O and SnCl₄·5H₂O as starting materials, NaOH as mineralizing agent, and distilled water and absolute ethanol as mixed solvents. In a typical experiment for synthesizing Zn₂SnO₄, the molar ratio of OH⁻ : Zn²⁺ : Sn⁴⁺ was set as 6 : 2 : 1. In detail, 0.525 g SnCl₄·5H₂O and 0.659 g Zn(CH₃COO)₂·2H₂O were dissolved in 20 mL ethanol under magnetic stirring, followed by dropping 20 mL aqueous solution of NaOH (0.45 M). After stirring for 30 min, the obtained white slurry was transferred to a 50 mL Teflon-lined autoclave and then maintained at 160°C for 24 h. When the autoclave was cooled down to room temperature naturally, the white precipitates were collected by centrifugation, washed several times with absolute ethanol and distilled water, and finally dried at 80°C in air for 5 h to get the final products. For comparison, parallel experiments were also carried out by varying the molar ratio of OH⁻ : Zn²⁺ : Sn⁴⁺. The samples prepared at the molar ratio of OH⁻ : Zn²⁺ : Sn⁴⁺ of 4 : 2 : 1, 6 : 2 : 1, 8 : 2 : 1 and 10 : 2 : 1 were denoted as 4S, 6S, 8S, and 10S, respectively.

2.2. Characterization

The phase structure and purity of the as-prepared products were characterized by powder X-ray diffraction (XRD) on Bruker D8 diffractometer with Cu Kα radiation ( = 1.54056 nm). The transmission electron microscopy (TEM) images, selected area electron diffraction (SAED) patterns, and high resolution TEM (HRTEM) images were collected on a JEM-2100 TEM. N₂ adsorption-desorption isotherms were collected at liquid nitrogen temperature using Quantachrome AsiQM0000-3 sorption analyzer. The specific surface area was calculated using multipoint Brunauer-Emmett-Teller (BET) method. The pore size distribution was determined from the adsorption branch of the isotherms using the DFT method. Before carrying out the measurement, each sample was degassed at 180°C for more than 6 h.

2.3. Measurement of Photocatalytic Activities

The photocatalytic activities of the as-prepared Zn₂SnO₄ were measured by photodegradation of methyl orange (MO) at room temperature. In a typical experiment, 50 mg as-prepared catalyst was suspended in 100 mL MO aqueous solutions (20 mg/L) in a water-jacketed reactor with the capacity of 200 mL. The UV lamp (TUV 4W/G4 T5, Philips, wavelength 254 nm) was placed above the reactor, and the distance between the lamp and liquid level was 10 cm. Before UV-light irradiation, the suspensions were stirred in dark for 30 min to ensure the establishment of absorption-desorption equilibrium. During the experiment, 3 mL reaction solution was taken out from the reaction system at a certain time interval and then centrifuged to remove the solid catalyst. After that, the obtained MO solution was analyzed on a UV-Vis spectrophotometer (TU-1810) in the wavelength range of 200–700 nm.

3. Results and Discussion

3.1. Characterization of the Prepared Samples

3.1.1. XRD Analysis

The phase structure and purity of the prepared samples was analyzed by XRD. Figure 1 shows the typical XRD patterns of the samples prepared at different conditions. It can be seen that when the molar ratio of OH⁻ : Zn²⁺ : Sn⁴⁺ was in the range of 4 : 2 : 1–8 : 2 : 1, cubic inverse spinal Zn₂SnO₄ phases can be successfully obtained. For example, as shown in Figure 1 (c), all the appeared reflection peaks from low angle area to high angle area can be indexed as perfect cubic inverse spinal Zn₂SnO₄ (JCPDS no. 24-1470). In the XRD patterns of 4S, 6S, and 8S (Figure 1 (a) to (c), resp.), no peaks from other crystal phases are detected, such as ZnO and SnO₂. This result indicates that the samples prepared at present condition are of pure Zn₂SnO₄ phase. Compared with 8S, the refection peaks of 4S and 6S are seriously broaden, which suggested that the used amount of alkali has important influences on the crystallinity of Zn₂SnO₄. In contrast, when the molar ratio of OH⁻ : Zn²⁺ : Sn⁴⁺ was increased to 10 : 2 : 1, as shown, the XRD pattern of 10S in Figure 1 (d), two crystalline phases of cubic ZnSn(OH)₆ (JCPDS file no. 20-1455), and hexagonal ZnO (JCPDS file no. 36-1451) are observed, which indicates that a mixture of ZnSn(OH)₆ and ZnO is obtained instead of the single Zn₂SnO₄ phase. Such result may be attributed to using excessive amount of alkali.

3.1.2. FT-IR Analysis

The chemical-bond types of the prepared Zn₂SnO₄ were investigated by FT-IR. Figure 2 shows the typical FT-IR spectra of the prepared 4S, 6S, and 8S. From the FT-IR spectra, we can see that the three samples exhibit similar characteristics of infrared adsorption bands, which are quite similar to the spinal Zn₂SnO₄ reported in previous literatures [11, 31]. Therein, the broad absorption peaks at 3426 and 1602 cm⁻¹ can be ascribed to the vibration of absorptive water, and the absorption peaks at 546, 1038, and 1410 cm⁻¹ are due to the vibration of M–O or M–O–M groups in Zn₂SnO₄. The results given by FT-IR analysis further confirm the formation of Zn₂SnO₄ and thus corroborate the results obtained in XRD analysis.

3.1.3. TEM Analysis

In order to obtain the detailed structural information of the as-prepared Zn₂SnO₄, further measurements by TEM and HR-TEM were performed. Figures 3(a)–3(c) show the typical TEM images of the prepared Zn₂SnO₄ samples. From Figures 3(a) and 3(b), it can be seen that a large scale of nanosized particles with irregular shapes are obtained in 4S and 6S, respectively. The size of these nanoparticles is measured to be about 5–8 nm for 4s and 12–15 nm for 6S. In order to minimize their surface energy, most of these formed nanoparticles aggregated together loosely. As for 8S, besides the irregular nanoparticles, many polyhedron-like particles with the size about 30 nm are also formed (Figure 3(c)), being obviously different from that observed in 6S and 8S. The different crystallite size and shape in the obtained Zn₂SnO₄ samples indicated that the used amount of alkali may have important influence on the formation of Zn₂SnO₄. Relatively high concentration of NaOH is favorable for achieving Zn₂SnO₄ with larger size. Moreover, it is worthy to be mentioned that in the three samples numerous nanopores with different size were formed in the interspaces among the nanoparticles due to their loosely aggregated characteristics, as shown in Figures 1 (a), (b), and (c). The existence of porous structure in the prepared Zn₂SnO₄ samples can be further convinced by following N₂-sorption analysis. The insets in Figures 3(a)–3(c) show the corresponding selected area electron diffraction (SAED) images of 4S, 6S, and 8S, respectively. The appeared diffraction rings in the SAED patterns demonstrate the polycrystalline nature of the prepared Zn₂SnO₄ samples. Figure 3(d) displays a representative HR-TEM image taken from one of the observed Zn₂SnO₄ nanoparticles in Figure 3(b). The distance between the adjacent lattice fringes is measured to be 0.263 nm, which can be attributed to the (311) crystal plane of cubic inverse spinal Zn₂SnO₄ (JCPDS no. 24-1470). This result is consistent with the XRD analysis, which further proved the preparation of crystalline Zn₂SnO₄ by the present solvothermal method.

(a)

(b)

(c)

(d)

3.1.4. N₂-Sorption Analysis

N₂-sorption measurements were further performed on the prepared Zn₂SnO₄ samples to obtain the information of specific surface area and pore structure. Figure 4 depicts the nitrogen adsorption-desorption isotherms and the corresponding pore size distributions of 4S, 6S, and 8S. From Figure 4(a) it can be seen that the adsorption-desorption isotherms of all three samples exhibit a type of IV-like behavior including a type H3 hysteresis loop according to the IUPAC classification. Such result demonstrated the existence of mesoporous structure in the prepared samples, which is in agreement with the TEM observation. The pore size distribution curves (Figure 4(b)) of the prepared Zn₂SnO₄ samples, being estimated based on the DFT method from the adsorption branch of the isotherm, indicated that the pore size distribution range for 4S and 6S was mainly centered at 1.7–10 nm, which was smaller than that of 8S (3–14.5 nm). As for the three Zn₂SnO₄ samples, the relative wide pore-size distribution may be mainly contributed to the random and disordered aggregation characteristics of Zn₂SnO₄ nanocrystals in the products. The calculated BET surface areas for 4S, 6S, and 8S were found to be 226, 166, and 91 m²·g⁻¹, respectively. Obviously, the surface area of 4S and 6S was higher than that of 8S. Combined with the TEM analysis, it can be concluded that the surface area of the prepared samples seriously decreased with the increasing of crystal size of Zn₂SnO₄.

(a)

(b)

3.2. Photocatalytic Properties Studies

In general, the photocatalytic properties of MOS can be influenced by many factors, such as the crystal size, exposed crystal plane, morphology, and band structure. In terms of our experiment, the crystal size and the surface area of Zn₂SnO₄ can be controlled by adjusting the used amount of alkali in the reaction system. Therefore, it was expected that the Zn₂SnO₄ samples prepared under different conditions can bring different photocatalytic activities. So, in order to evaluate the photocatalytic activity of the prepared Zn₂SnO₄, the experiments of photodegradation of methyl orange (MO) were performed under UV-light irradiation. Figures 5(a)–5(c) show the time-dependent absorption spectra of MO solution containing different Zn₂SnO₄ catalysts during the UV-light irradiation. It can be seen that the characteristic absorption peak of MO centered around 465 nm decreased rapidly in intensity with the irradiation time and almost disappeared after undergoing a certain time of irradiation. The decreased speed of MO concentration in Figures 5(a) and 5(b) was found to be faster than that in Figure 5(c), indicating that the photodegradation capacity of 4S and 6S is stronger than that of 8S. The photodegradation plots of MO under UV-light by using different Zn₂SnO₄ samples as catalysts are shown in Figure 5(d), in which was substituted by , where and are the initial and actual concentration of MO, respectively, because the normalized concentration of the solution equals the normalized maximum absorbance. For comparison, the degradation plot of MO without any catalyst is also displayed in Figure 5(d). It can be seen that when there was no catalyst in the reaction system, the decrease of is very slow and almost negligible. After irradiating for 100 min, only about 0.5% of total MO molecules were depredated. However, once the catalyst of Zn₂SnO₄ was added, a rapid decrease of was observed, indicating that the prepared Zn₂SnO₄ samples are effective to depredate MO molecules. Under the same irradiation period, the values of for 4S and 6S were larger than thos for 8S, indicating their better photocatalytic activity than 8S. After 100 min irradiation, the values for 4S, 6S, and 8S are about 0, 0.06, and 0.6, corresponding to the degradation about 100%, 96%, and 40% of total MO molecules, respectively. The superior photocatalytic activity of 4S and 6S can be explained by their smaller crystal size and larger surface area. It is generally accepted that the catalytic process is mainly related to the adsorption and desorption of organic dye molecules on the surface of the catalyst. The higher specific surface area of 4S (226 m²·g⁻¹) and 6S (166 m²·g⁻¹) can provide more unsaturated surface coordination sites exposed to the solution and more opportunities for dye molecules to absorb on the surface of catalysts, resulting in the production of more active reaction sites. Moreover, the mesoporous structures in the catalysts enable storage of more dye molecules, which can also promote the photocatalytic properties. Furthermore, the bandgap of the catalyst material may be another important factor that can influence the photocatalytic properties. In our experiment, the crystallite size of Zn₂SnO₄ in 4S and 6S was observed to be less than 20 nm. Therefore, the bandgap of Zn₂SnO₄ catalyst may be broadened by the quantum size effect. The broadened bandgap can not only bring higher redox potentials but also promote electrons transferring form the conductive band of Zn₂SnO₄ with high electric potential to those with low electric potential. Thus, the recombination of the photogenerated electron-hole pair can be hampered, which in turn results in the enhancement of the charge-transfer rates in the catalyst.

(a)

(b)

(c)

(d)

4. Conclusions

In summary, a simple solvothermal route was successfully developed for controlled synthesis of Zn₂SnO₄ nanocrystals with different shape and size. Irregular Zn₂SnO₄ nanoparticles about 5–8 nm (4S) and 12–15 nm in size (6S) and polyhedron-like Zn₂SnO₄ nanoparticles about 30 nm in size (8S) can be easily obtained by adjusting the used amount of alkali. The BET surface areas of the prepared samples of 4S, 6S, and 8S were measured to be 226, 166, and 91 m²·g⁻¹, respectively. Due to the higher specific surface area and quantum size effects, the 4S and 6S exhibited higher photocatalytic activity to degrade MO than 8S.

Conflict of Interests

The authors have no conflict of interests in relation to the instrumental companies directly or indirectly.

Acknowledgments

This work was supported by the National Natural Science Foundation of China (51172065), Program for Innovative Research Team in the University of Henan Province (2012IRTSTHN007), Foundation of Henan Scientific and Technology Key Project (112102310425, 112102310029, and 132102210251), the Education Department Natural Science Foundation of Henan Province (2011B150009 and 13A430315), China Postdoctoral Science Foundation funded project (2012M521394), and Specialized Research Fund for the Doctoral Program of Higher Education (20124116120002).

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International Journal of Photoenergy

Structurally and Elementally Promoted Nanomaterials for Photocatalysis

Solvothermal Synthesis of Zn2SnO4 Nanocrystals and Their Photocatalytic Properties

Abstract

1. Introduction

2. Experimental Section

2.1. Synthesis of the Zn2SnO4

2.2. Characterization

2.3. Measurement of Photocatalytic Activities

3. Results and Discussion

3.1. Characterization of the Prepared Samples

3.1.1. XRD Analysis

3.1.2. FT-IR Analysis

3.1.3. TEM Analysis

3.1.4. N2-Sorption Analysis

3.2. Photocatalytic Properties Studies

4. Conclusions

Conflict of Interests

Acknowledgments

References

Copyright

Solvothermal Synthesis of Zn₂SnO₄ Nanocrystals and Their Photocatalytic Properties

2.1. Synthesis of the Zn₂SnO₄

3.1.4. N₂-Sorption Analysis