Abstract
In this work, the uranyl-curcumin metal–organic framework (MOF) samples were synthesized using ultrasound, reflux, hydrothermal and ultrasound assisted reflux techniques. Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, and N2 adsorption/desorption isotherm were used to identify and investigate the properties of the samples. The results showed that the synthesized products by ultrasound methods shows excellent properties than the other methods and had a significant porosity of 2.74 nm with the surface area of 42.66 m2/g. In this method, the size of particles is in the range of 40–90 nm, and the samples had a spherical morphology by uniform distribution without any agglomeration. In the second part of this study, the 2k−1 factorial method was used to evaluate the effects of several parameters (pH, contact time, phenol red concentration and photocatalyst content) on the photocatalytic activity of the uranyl-MOF with curcumin ligands in the degradation of phenol red from aqueous samples. The results showed that in optimal conditions (pH 8.04, contact time: 11 min, phenol red concentration: 0.11 mg/L, and amount of MOF: 18.00 mg), more than 99% of the phenol red could be degraded.
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1 Introduction
Metal–Organic framework (MOF) is a group of porous nanomaterials that have received special attention to their distinctive features over other nanostructures [1, 2]. Unique properties of these compounds are high chemical and thermal stability, ideal physicochemical properties and flexibility in design [3, 4].
These materials are synthesized by various methods under different conditions including electrochemical [5], mechanochemical [6], ionothermal [7], and solvothermal methods [8]. Regarding the manufacturing of high-yield products, also performing reactions in environmental conditions that the speed of the reaction is performed under favorable conditions, novel methods of ultrasound, reflux, and hydrothermal have been considered recently [9, 10].
5f- series of elements are not only unique due to their radioactivity but also because of different oxidation states and atomic and cationic radius. As uranium, which is the heaviest element of this group, has attracted a lot of attention due to its nuclear physics and chemical status [11].
Among several MOFs made of the uranium, uranyl (UO2)+2 is the most common structural unit for this metal [12]. Therefore, the fabricating of uranyl-MOF has a particular importance with regard to its ideal features. These compounds due to their ideal properties in a variety of fields, such as environmental are applicable [13].
The photocatalytic activity is a phenomenon based on the absorption of photons and the formation of electron–hole pairs. These compounds react with molecules present on the surface of the particles [14]. Until the present, a lot of MOFs has been developed due to features such as high surface area, mechano-chemical stability, and high absorption capacity of sunlight for photocatalytic activity [15]. But, the main problem with these compounds is the low quantum efficiency of the photocurrent, which leads to the recombination of the electron–hole pairs [16], so the use of new photocatalysts with high efficiency has particular importance.
Phenol red is an environmental pollutant that is categorized in the tribenzo-methane group of dyes. Phenol red has red crystals with a good stability in the aqueous solutions [17]. The toxicity data show that phenol red inhibits the growth of kidney cells and has very harmful effects on health [18].
In this study, the uranyl-MOF was synthesized for the first time using the curcumin ligand by fast and high efficiency reflux, ultrasound, hydrothermal and ultrasound assisted reflux techniques. The 2k−1 factorial statistical method was applied to design the parameters affecting the photocatalytic activity as well as the systematic study of the process to degradation of phenol red from aqueous samples.
2 Materials and methods
2.1 Materials
The experimental materials include, curcumin ligand (99% purity, Merck, Germany), uranyl acetate (99% purity, Merck, Germany), ethanol (99.8% purity, Merck, Germany), phenol red (Merck, Germany) and distilled water. All materials were used without further purification.
2.2 Instrument and characterization
The ultrasound apparatus manufacturing company of Bandelin sonopuls (model no: HD3200) was used for synthesis procedure. FT-IR spectrometer (tensor, manufactured by Brucker, Germany), X-ray diffractometer (XRD, Philips, Netherlands), thermogravimetric analysis (model Q600), scanning electron microscopy (SEM, model Em3200, manufactured by China kyky corporation), transmission electron microscopy (TEM, Philips CM120), and N2 gas adsorption/desorption measurements (Belsrp Mini ii, Bel company, Japan) were utilized in order to acquire characteristic information.
2.3 Uranyl-MOF synthesis
2.3.1 Ultrasound method
The typical method for the synthesis of uranyl-MOF nanostructures by ultrasound routs is as follows: first, 0.080 g of uranyl acetate was dissolved in 40 mL distilled water. Also, 0.117 g of curcumin ligand was dissolved in 48 mL of ethanol. Then, the two solutions were mixed, and the resultant solution was subjected to the ultrasound irradiation of 200 W for 30 min. After 4 days, the red crystals of the uranyl-curcumin-MOF were formed. After this time, in order to evaporate the solvent, the solution was poured into the watch glasses and placed at room temperature. Finally, it was placed in an oven device for 4 h at 200 °C for removal of excess water.
2.3.2 Reflux method
In order to synthesize uranyl-MOF nanostructures with reflux method, the solutions were first prepared according to the sect. 2.3.1. It was then placed under reflux conditions at 50 °C for 4 h. In order to dry the sediment and evaporate the solvent, the solution was poured into the watch glass and placed at room temperature. After collecting the precipitates, the final product was placed at 200 °C for 4 h in an oven device.
2.3.3 Hydrothermal method
After preparing the solution according to the sect. 2.3.1, the solutions were poured into the autoclave and placed in an oven device at 200 °C for 4 h. In order to remove the impurities, the precipitate was placed three times in a centrifuge at a speed of 3000 rpm and each time for 10 min. After each rotation period, the sediment was washed with distilled water and the resulting precipitate was poured into a glass container for drying. Finally, after drying and collecting precipitates, the final product was placed in oven device at 200 °C for 4 h.
2.3.4 Ultrasound assisted reflux method
After preparing the solution under ultrasound conditions, according to the sect. 2.3.1, the solution was placed under reflux conditions according to the sect. 2.3.2.
2.4 Sorption capacity
Sorption capacity of phenol red is determined by using different concentrations of phenol red (5, 25, 35 and 50 mg/L), and catalyst content of (5 g/L) at room temperature in different times (10–70 min) interval by GC–MS device (model Agilentو GC: 6890).
2.5 Degradation of phenol red
First, a solution of phenol red with a certain concentration (5–50 mg/L) was prepared and then, a certain amount of uranyl-curcumin-MOF (0.1–1 mg) was mixed. The mixture was placed in the shaker device in a certain time (5–35 min) in order to completely mixing the materials. Then, this mixture was centrifuged for 5 min, and after separating the catalyst, spectral solutions were plotted by using visible-ultraviolet spectrometry. Four different experiments were done in various conditions such as, without irradiation, free catalyst, under visible light, and by UV–Vis which is as an irradiation source for a certain period of time.
2.6 Systematic study and RSM optimization
The 2k−1 method and RSM optimization were used for experimental design of the procedure. Also, these systematic studies were applied for evaluating the effects of several parameters (pH, contact time, phenol red concentration and photocatalyst content) on the photocatalytic activity of the uranyl-MOF in the degradation of phenol red.
3 Result and discussion
3.1 Suggested formula
FT-IR spectra were used for identifying the functional groups and organic molecules in the composition structure. Figure 1a shows the FT-IR spectrum of the curcumin ligand. Based on this Fig, the observed peaks in the range of 1428.47–1596.73 cm−1 can be related to the aromatic C=C vibrations. The peaks near 3040.04 and 2940.75 cm−1 refer to the stretching vibrations of the C–H aromatic unsaturated bonds. The presence of absorption bands in the range of 1628 cm−1 probably indicates the vibrations of C=O bond. Also, the peaks in the range of 3500.02–3380.93 cm−1 are related to the vibrations of OH groups. These peaks represent the functional groups in the curcumin structure [19].
In Fig. 1b, the FT-IR spectrum of the synthesized uranyl-MOF samples by ultrasound, reflux, hydrothermal and ultrasound assisted reflux techniques has been shown. In four samples, a new peak appears in the range of 460.96 and 555.58 cm−1, which can be indicative of U–O bonding [20]. According to FT-IR spectra and different configurations of the curcumin ligand [21], the structure of the Fig. 2 is suggested for the formation of uranyl-MOF.
3.2 XRD patterns
The XRD patterns of raw curcumin ligand and uranyl-MOF products are shown in Fig. 3. The new emerged peaks in the products compare to raw curcumin can be related to the formation of a new phase of uranyl-curcumin-MOF. The effects of synthesis routes in the XRD results of the samples (Fig. 3) indicate that ultrasound irradiation causes just the increment in widening of the major peaks. This may come from the effects of new nucleation in preferable sites in the solution. Also, this outcome plays up that the time or power of the irradiation is enough to make such favourable changes [22]. It is seen the minor discrepancy in the hydrothermal patterns than the others in some position (2θ = 25.23, 28.37, 31.84, 33.18), is related to some degeneration of precursors in to subject of higher temperature required for the synthesis procedure. Especially in reflux method, the various diffusion of atoms in the solution are involved that can affect density. There are no significant peak shifts in the patterns. The crystallite size of the synthesized uranyl-MOF samples under different methods is calculated based on Scherer formula (Table 1). Based on the calculated results, it is found that the synthesized samples by ultrasound and ultrasound assisted reflux methods have relatively smaller crystallite sizes than the other methods.
3.3 Thermal gravimetric analysis (TGA)
According to TGA results (Fig. 4), there are two major steps for weighting loss in curcumin precursor. In first step, slightly weight change due to the evaporation of moisture (105 °C) is occuered, and in the later step (275 °C) its structure goes to collapse and cause degenerated. Also, there are two main weight loss levels in the final products of the samples. Firstly, all of them lost their adsorbed water and guest molecules (around 45–250 °C). At last, the frameworks are stable up to 365, 380, 410 and 445 °C, for hydrothermal, reflux, ultrasound assisted reflux and ultrasound methods, respectively. The thermal stability of a MOF is determined by different factors, such as ligand stability, and also how much the strength between used ligands and metal units specifically their chemical bonding [23]. The facile crystallization of the precursor, the better conjunction between ligand and precursor and also excellent uniform particles distribution could be more achievable in the ultrasound power source than afforded heat in the hydrothermal method. These factors could result in better thermal stability for ultrasound synthesized sample compare to hydrothermal or reflux methods.
3.4 Morphology and size distribution
In this section, the morphology and size j of the synthesized uranyl-MOF samples by different methods of reflux, ultrasound, hydrothermal and ultrasound assisted reflux have been investigated by SEM images. Figure 5a, b illustrates the SEM images of the synthesized samples under reflux conditions. Since the average particle size distribution is less than 100 nm, the nanoscale nature of the products is confirmed [24].
SEM images of the synthesized uranyl-MOF samples by ultrasound method (Fig. 5c, d) show that the compounds have a uniform morphology. In this method, the average particle size is in the range of 40–90 nm and agglomeration in the structure is not observed. Also, the particle size distribution of the sample is more uniform than the synthesized sample by the reflux method. The stability of these samples can be attributed to the effects of ultrasound irradiation on the morphology and particle size distribution of the products [25].
Figure 5e shows the SEM image of the synthesized uranyl-MOF samples by ultrasound assisted reflux method, which confirms the nanoscale nature of the samples. The stability of these compounds is higher than the reflux-synthesized samples which cause these structures exhibit less agglomeration. By comparing this image with SEM images of the ultrasound synthesized samples, it is evident that the synthesized sample by ultrasound assisted reflux method is slightly agglomerated which shows the lower stability of this compound [26]. Although the dominant morphology of these structures is spherical, in some parts, the particles are growing in the form of rod shape. This can be due to the use of ultrasound assisted reflux method that affects the morphology of the samples.
Regarding hydrothermal synthesized samples (Fig. 5f), it is evident that these specimens are distributed in the nanoscale and are almost uniform. In this method, the particles aggregated in some areas will be coordinated in the lattice of uranyl-MOF samples. This can be likely attributed to the used solvent in this study. Therefore, a high temperature (about 250 °C) is required to eliminate this solvent [27]. On the other hand, in this study, the hydrothermal method with a temperature of 190 °C has been used, so it is likely that this water is coordinated as impurities placed in the lattice of metal organic framework nanostructure which may cause structural instability.
As a result, the SEM images showed that ultrasound synthesized samples have more homogeneous morphology and more spherical distribution. Also, morphology and size distribution of the sample synthesized by ultrasound (optimal method) are evaluated by TEM images as depicted in the Fig. 6a, b. As observed the particles have nanosized nature. Also, there is no evidence of the agglomeration in this sample that confirms the result obtained from the SEM image. Indeed, the majority of particles have polygonal shape with a mean diameter range of 35 nm.
3.5 Textural properties
The samples synthesized by ultrasound and ultrasound assisted reflux method because of their better properties compared to the other methods, including higher thermal stability and homogeneous particle size distribution, were selected as desirable products. In order to determine the textural properties of these samples, the N2 adsorption/desorption isotherms at 77 K were used. Based on the results obtained from Fig. 7a, b, the ultrasound synthesized sample has a surface area of 42.62 m 2/g, while the hydrothermal synthesized sample had a surface area of 4.94 m2/g. The results of the BJH method Fig. 8a, b indicating that in both methods, the samples had a mesoporous nature, with an average pore size of 2.74 nm. Also, the N2 adsorption/ desorption isotherms of the synthesized samples by both methods are typical IUPAC type IV form [28]. Based on these results, especially higher surface area for the synthesized samples by ultrasound method compare to other, it is concluded that these samples could be much more effective to have such potentials in order to choose for photocatalytic applications.
3.6 Determining the calibration curve for measuring the phenol red
The calibration curves by acquired absorption amount from different solutions of phenol red at the known concentrations (Table 2) were obtained. By using these data, the concentration of unknown solutions was determined [29]. As shown in Fig. 9, the different absorption amounts versus varying concentrations in the wavelengths of 430 and 580 nm for the phenol red are presented.
3.7 Photoluminescence (PL) spectra
PL spectra at room temperature of the synthesized uranyl–MOF samples by ultrasound, reflux, hydrothermal and ultrasound assisted reflux techniques were depicted in Fig. 10. All of them are focused on a main emission band in the range of 495 nm. By comparing these four curves, it is found that the intensity of the synthesized sample by ultrasound method is lower from the other method, and close to the synthesized sample by ultrasound-reflux method. The lower PL intensities for these samples is caused by lower density surface states that is resulted from lower crystallite size (Table 1) and more fine distribution of small particles (Fig. 6c, d. These unique structural properties for these types of the synthesized samples in favour of ultrasound irradiation indicate higher photocatalytic potential [30, 31].
3.8 Sorption capacity
The sorption capacity of the uranyl–MOF sample are depicted in Fig. 11. In all of plots, in early step (about 40 min), there is a steep slope in increasing adsorbate amount of phenol red. However, by increasing time duration, the effect of saturation in sorbent can be seen. Also, by increasing the phenol red concentration, the amount of qe will be growth. The highest amount of capacity of sorption (i.e. qe) equal to 13.84 mg/g will be obtained at initial concentration of phenol red equivalent 50 g/l in a 70 min time of contact.
Photocatalytic activity of the synthesized uranyl–MOF was studied by degrading phenol red in aqueous medium under UV irradiation in different conditions. Band gaps of MOFs determine through the highest occupied molecular orbital (HOMO)- lowest unoccupied molecular orbital (LUMO) gaps of the organic ligand molecule [32]. The proposed mechanism for the degradation of phenol red is that when light falls on photo catalyst result in the excitation of electron (e−) from valence band to the conduction band of electron creating positively charged hole (h+) in the valence band of uranyl–MOF. The created hole reacts with H2O molecules to produce hydroxyl radicals (⋅OH). Also, the electron in the conduction band turns the molecular oxygen to superoxide anion radical (⋅O2−). These radicals are highly reactive toward phenol red degradation. The major reactions are summarized in the following equations.
In order to investigate the photocatalytic activity of uranyl-MOF in the degradation of phenol red from aqueous samples, an experiment was designed, and the percentage of phenol red degradation in different conditions was studied [33]. At first, four solutions with a specific concentration of phenol red were obtained, samples of A, B, C, D, respectively. Sample A is solution containing phenol red without any irradiation. Sample B contains phenol red with a certain amount of the photocatalyst under the influence of visible light (3 h, 200 W lamp). Sample C is free catalyst under UV irradiation (3 h, 14W lamp), and sample D was the phenol red solution that containing a certain amount of photocatalyst under the influence of UV light (3 h, 14 W lamp). Results indicate the severe impacts of UV absorbing on the degradation amount of phenol red, and could increase the efficiency about two-fold and this behavior shows that uranyl-MOF is a UV-light activated photocatalyst (Table 3).
3.9 Experimental design
The 2k−1 factorial method was used to scientific design of the experiments. Also, it studied the effect of experimental parameters on the photocatalytic behavior of the synthesized uranyl-MOF by ultrasound methods in order to degradation of phenol red from aqueous samples [10]. The four factors investigated include pH (A), contact time (B), phenol red concentration (C) and photocatalyst content (D). Each factor is designed at three levels (Table 4). After designing the experiments with the 2k−1 factorial, the samples were carried out experimentally with two replications in the laboratory. The results obtained from degradation of phenol red were reported in Table 5.
3.9.1 Evaluation of the efficiency of phenol red degradation
In order to verify that the experiments are scientific and the person is not involved in the design and layout of the test, the residual plots of the 2k−1 factorial design as output are taken into account [26]. As shown in Fig. 12, there are a number of positive and negative that are equal, and it is demonstrated that the design of the experiments is scientific. In order to investigate the effect of experimental parameters, after designing the experiment with the 2k−1 factorial method and entering the experimental data, the results were investigated by analysis of variance [34].
The smaller (p) and higher (α) values imply on the weight of model terms and coefficients (Table 6) [25, 35]. The very low amount of P-value (about 0.000 for all parameters) indicated on the significancy of this model.
Also, Pareto chart (Fig. 13) shows the effect of experimental parameters on the rate of degradation of phenol red. As it is clear, all factors A, B, C, D have a significant effect on the amount of phenol red degradation. Also, this chart illustrates the fact that the interaction of experimental parameter on the effect of degradation is noticeable.
In this study, such general experimental parameters including pH, contact time, concentration and photocatalyst content influenced on the phenol red degradation are in agreement with previous studies [32, 36]. While, in previous studies, to investigate the effects of experimental parameters, the classical process were used which these studies increase the number of experiments and, therefore, are not economically feasible also is time-consuming [37, 38].
3.9.2 Optimization of the procedure
Since analysis of variance based on 2K−1 factorial design determined the parameters affecting the phenol red degradation, the response surface morphology (RSM) was used to optimize the process and find the best experimental conditions. Since our goal is to achieve the maximum degradation amount (Fig. 14), the predicted value of the parameters influenced the degradation of the phenol red according to the RSM output that is reported in Table 7. This amount of phenol red degradation acquired by uranyl- MOF has been significantly improved compare with other samples [37, 39, 40]. The high efficiency of these products can be attributed to the development of a novel photocatalyst sample, and the study of various synthesis methods with choice of the appropriate route. Also, the systematic study of the procedure can be led to scientific design of effective parameters that affect the diversity of phenol red degradation in these products. In order to verify the accuracy of the parameters obtained by 2k−1 factorial design, the experiment was designed based on optimal parameters (pH 8.04, contact time: 11.00 min, phenol red concentration: 0.11 mg/mL, and photocatalyst content: 18.00 mg), and the percentage degradation was 99%, which indicated the accuracy data obtained by RSM optimization.
Based on what has been investigated, the important factors with effect on the degradation of phenol red from aqueous solutions included pH, contact time, phenol red concentration and photocatalyst content. Also, the ease of production and use of catalysts are vitally important. Based on the Table 8 which summarized similar publications, the main different aspects of this study compare to other researches is fast process and time-saving of degradation by new type of materials developed in this work. Also in this study, the whole process is fast and demand no especial high-cost devices.
3.10 Stability of samples during photocatalytic experiment
One of the restriction in using of photocatalytic materials is related to stability and ability to reusable of these catalysts. In order to examine this features in the synthesized uranyl-MOF sample by ultrasound method, XRD patterns is done, and result is depicted in Fig. 15. Based on this upshot, we concluded that crystallinity of the structure and also the framework is remain almost unchanged that can be cost-effective and contribute in saving resources.
4 Conclusion
The novel metal–organic framework of uranyl with curcumin ligand was synthesized by ultrasound, reflux, hydrothermal and ultrasound assisted reflux methods. The results showed that the synthesized sample by ultrasound methods, indicated the high surface area, good crystalline structure and also have the lowest agglomeration or any clustering among the particles. These features make the ultrasound irradiation as an efficient and optimum route for production such MOFs. The 2k−1 factorial method was used to systematic design and study the effects of experimental parameters on the photocatalytic activity of the synthesized uranyl-MOF by ultrasound methods in the degradation of phenol red from aqueous samples. During the experimental design, different degradation percentages were observed from 20 to 96%, and the optimal parameters (pH 8.04, contact time: 11.00 min, phenol red concentration: 0.11 mg/L and photocatalyst content: 18.00 mg) were determined. According to the optimal parameters, the RSM showed 99.98% of degradation performance. Also stability test showed very good crystallinity and structure preserve even after degradation from synthesized sample by ultrasound method.
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The authors would like to acknowledge financial support for this work from the Graduate University of Advanced Technology, Kerman, Iran.
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Khandan, F.M., Afzali, D., Sargazi, G. et al. Novel uranyl-curcumin-MOF photocatalysts with highly performance photocatalytic activity toward the degradation of phenol red from aqueous solution: effective synthesis route, design and a controllable systematic study. J Mater Sci: Mater Electron 29, 18600–18613 (2018). https://doi.org/10.1007/s10854-018-9978-z
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DOI: https://doi.org/10.1007/s10854-018-9978-z