Materials and Energy Research Center MERC Contents lists available at ACERP Advanced Ceramics Progress Journal Homepage:www.acerp.ir Original Research Article Synthesis of CuO and CuO/ZnO Composite Powders for Antibacterial, Photocatalytic, and Pigment-Related Applications Moshkan Dokht Khosravi a, Mehdi Ghahari b, , Mahdi Shafiee Afarani c, Amir Masoud Arabi d a MSc, Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Sistan and Baluchestan, Iran b Associate Professor, Department of Nano Materials and Nano Coatings, Institute for Color Science and Technology (ICST), Tehran, Tehran, Iran c Professor, Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Sistan and Baluchestan, Iran d Associate Professor, Department of Inorganic Pigments and Glazes, Institute for Color Science and Technology (ICST), Tehran, Tehran, Iran Corresponding Author Email: email@example.com (M. Ghahari) URL: https://www.acerp.ir/article_147533.html ARTICLE INFO ABSTRACT Article History: Received 15 February 2022 Received in revised form 17 March 2022 Accepted 5 April 2022 Incorporation of CuO into ZnO contributes to the formation of CuO/ZnO composite, thus enhancing some properties of individual oxides such as antibacterial and photocatalytic activities. The current study evaluated the effect of both synthesis and in-situ syntheses of copper oxide on the zinc oxide particles using Copper(II) nitrate trihydrate as the starting material as well as acetic acid, D200, SHMP, PVP, CTAB, SDS, urea, and M2P surfactants. The impact of surfactants on the microstructure and chromatic properties of the samples was also investigated. The results from scanning electron micrographs showed different morphologies of copper oxide particles in the forms of needle, round, and flake depending on the type of surfactant. Moreover, the chromatic properties of the powders showed that the pigment synthesized in the presence of SHMP was in a better and darker black color than the others. Further, copper oxide powders exhibited more proper anti-bacterial behavior than the copper oxide/zinc oxide composite powders. In addition, copper oxide/zinc oxide particles had higher photocatalytic activity (up to 95 %) than copper oxide powders (about 65 %). Keywords: CuO/ZnO Composite Surfactants Chromatic Characterization Antibacterial Photocatalytic Activity https://doi.org/10.30501/acp.2022.329820.1082 1. INTRODUCTION The increasing growth of population has negatively affected water quality by releasing a variety of pollutants into water sources. It is predicted that more than 50 % of the countries around the globe will face water crisis by 2025 . Different pollutants such as heavy metal ions, organic dyes, industrial wastes, pesticides, and pharmaceutical wastes are considered seious threats to water quality. This is the reason why application of efficient water purification technologies such as photocatalysis, electrochemical treatment, membrane filtration, ozonation, and flocculation for water treatment have gained significance. For a long time, photocatalysis has used as a simple and efficient technique for water purification. Nowadays, using composite materials has significantly contributed to developing highly efficient materials and removing a wide range of pollutants . Synthesis, coating, and fabrication of copper (II) oxide and copper (I) oxide materials have considerably drawn researchers’ attention in the last decades due to their numerous applications. They are employed in different fields of ceramic applications such as producing inks for FET transistors , antibacterial materials for medical and biological applications [4-6], solar cells [7-9], gas sensors [10,11], electrochemical sensors [12,13], photocatalysts [14-16], and pigments . Copper oxide was synthesized through several methods such as thermal decomposition [18,19], sonochemical [20,21] and hydrothermal [22,23], milling [24,25], electrodeposition [26,27], ultrasonic spray pyrolysis [25,28], solution combustion [25,29], electrochemical oxidation , and precipitation [28,31]. The precipitation method as an easy-eco route was employed to prepare copper oxide particles in many studies. Several investigations evaluated the effects of different surfactants on the microstructure and properties of copper oxide particles . Of note, addition of CuO to ZnO can form CuO-ZnO composite that increases the particle size and decreases the bandgap energy. In other words, the higher the concentration of CuO in the composite, the smaller the bandgap energy. It can also increase the stability of the photocatalytic reaction and radical species such as superoxide anion radical (•O2-), (HO2•) and (HO2-) which can inhibit the growth of bacteria . Some researchers have evaluated the effects of antibacterial and photocatalytic properties of CuO/ZnO composites on different pollutants under UV or visible irradiation . The main objective of the current study was to synthesize copper oxide and copper oxide/zinc oxide composite particles based on the precipitation method in the presence of different surfactants. To the best of the authors’ knowledge, the effect of these surfactants on the morphology of CuO/ZnO particles was investigated for the first time. In this regard, the structure, microstructure, and antibacterial and optical properties of the powders were examined. In addition, the photocatalytic properties of the synthesized composite were studied on DR23 dye for the first time. 2. MATERIALS AND METHODS CuO and CuO/ZnO composite powders were synthesized using Copper (II) nitrate trihydrate (Cu(NO3)2.3H2O, Merck), Manganese (II) acetate tetrahydrate (Mn(CH3COO)2•4H2O, Merck), Zinc nitrate hexa-hydrate (Zn(NO3)2.6H2O, Merck) as the starting materials. In addition, Glycine (C2H5NO2, Merck) and Glucose (C6H12O6, Merck) were used as the fuels. Moreover, Cetyl trimethyl ammonium bromide ((C16H33)N(CH3)3]Br, CTAB, Merck), Polyvinyl-pyrrolidone ((C6H9NO)n, PVP, Rahavard Tamin Pharmaceutical Co.), Sodium hexametaphosphate ((NaPO3)6, SHMP, Dai Viet Chem), Sodium dodecyl sulfate (NaC12H25SO4, SDS, Merck), acetic acid (CH3COOH, Merck), Urea (CH4N2O, Merck), Acrylic homopolymer (D200, MW=5000, Simab Rezin Co.), dispersants (MP, ICST), Anionic PEG acrylate homopolymer dispersants (M2P, ICST) were used as the surfactants. Copper oxide powders were synthesized through the precipitation method in the presence of different surfactants. To this end, first, 0.97 g copper nitrate tri-hydrated and 0.0194 g Manganese acetate tetra-hydrate (0.02 wt. % of Cu precursor) were dissolved in 250 mL water. Then, the surfactants were added to the solution and agitated under magnetic stirring to dissolve completely. The weight ratio of the surfactant to copper precursor was assumed to be 1:2. Next, NaOH solution (1 molar, Merck) was added drop wise to the solution up to the pH adjustment of 9 and mixed for 15 min followed by more heating at 100 °C for an hour until a black precipitate was obtained. Finally, the obtained sample was washed three times and dried at 100 °C in an electric oven for one hour. Zinc oxide particles were synthesized through solution combustion synthesis method. To this end, first, 5 g zinc nitrate hexahydrate, 1.15 g glucose, and 0.1 g glycine were dissolved in 20 mL deionized water under magnetic stirring. The transparent solutions were heated at 80 °C under magnetic stirring until yellowish gel-like precipitates were obtained. The combustion reaction of samples occurred in a commercial microwave oven (SAMSUNG) with the frequency of 50 Hz and power of 900 W for one min, and spongy-foam like agglomerated particles were obtained. To complete the reaction and remove the residual organic matters, the samples were transferred to an electric furnace and calcined (post-heated) at 500 °C at the soaking time of one hour and heating rate of 10 °C min−1. The mentioned CuO synthesis process was repeated in the presence of synthesized ZnO particles to obtain CuO/ZnO composite. All other synthesized processes are similar to those of CuO synthesis. The microstructure and structural characteristcs of the samples were identified using Scanning Electron Microscopy (SEM, LEO 1455 VP) and XRD (Siemens D-500) methods. The mean particle size of the powder samples was determined using an image processing software, i.e., ImageJ 1.44p. The mean diameter (dScherrer) of zinc aluminate (gahnite) crystallite was determined considering the half-height width (β) of the (311) diffraction peak of gahnite using Scherrer equation (dScherrer=0.9λ/βcosθ). In addition, WQF-510 FT-IR (RAYLEIGH) Spectrometer was used to study the bonding structures. Photoluminescence (PL) studies were conducted using a PerkinElmer LS 55 Fluorescence Spectrometer (phosphorescence mode) with the exciting wavelength of 360 nm. Chromaticity color index (CIE) calculations were performed based on the photoluminescence spectra using MATLAB programming. Broth microdilution method was used in the anti-bacterial tests with E. coli and S. aureus bacteria which were Gram-negative and Gram-positive, respectively. The photocatalytic activities of the prepared CuO and CuO/ZnO powders were evaluated based on the degradation of Direct Red 23 (RD23) under UV light source in a prototype photocatalytic agitated reactor. Suspensions were prepared by adding 0.4 g of the synthesized powders to 500 mL standard solution of DR23 with the concentration of 20 mg/L. First, suspensions were kept in a dark medium under agitating for 30 min to complete the absorption/desorption process. Then, the DR23 photodegradation yield was obtained during 210 min of suspension irradiation. Photodegradation reactions occured in a 500 mL volumetric glass where a transparent silica glass tube containing a 15 Watt UV lamp was located. The suspension was agitated by a magnet stirrer rotating at 500 rpm during the test. Two mL of suspensions were obtained at each 15 min interval, and their absorbency was measured using a UV–vis spectrophotometer (Perkin-Elmer Lambda 25) at the maximum absorption wavelength of 503 nm. 3. RESULTS AND DISCUSSION Figure 1 depicts the XRD patterns of the synthesized copper oxide and copper oxide/zinc oxide powder samples. As shown in this figure, copper oxide powder contained CuO phase characterized by a monoclinic structure (card no. 01-080-1916). Apparently, NaOH and surfactant function locally as a redox in the synthesis process that leads to the Cu2O minor phase. Moreover, ZnO with wurtzite structure (card no.01-076-0704) was formed in addition to these phases in copper oxide/zinc oxide composite powder samples. Figures 2 (a-h) show the SEM micrographs of copper oxide particles synthesized in the presence of different surfactants. As shown in Figures 2 (a-b), the presence of acetic acid and D200 surfactants contributes to the formation of highly agglomerated particles. Moreover, some spherical nanoparticles of the particle sizes of 50-70 nm were formed. In comparison with the synthesis of case in the presence of acetic acid and D200, synthesis in the presence of Sodium Hexametaphosphate (SHMP) led to formation of very fine spherical particles with less agglomeration (Figure 2(c)). In addition, PVP and CTAB surfactants made the synthesis of particles with flake-like microstructures (Figures 2 (d-e)) feasible. Moreover, synthesis in the presence of amine containing surfactants, i.e., SDS, urea, and M2P, resulted in a combination of needle- and flake-shaped morphologies, as illustrated in Figures 2 (f-h), respectively. Figure 1. XRD pattern of the synthesized copper oxide (a) and (b) copper oxide/zinc oxide powders Figure 3 presents the macro images of the synthesized particles using different surfactants. Based on these images, darker powders were selected for chromatic characterization (Table 1). Powder samples synthesized in the presence of SHMP surfactant are shown in darker colors than the other ones. The anti-bacterial properties of ZnO/CuO composite and CuO powders synthesized in the presence of SHMP surfactant were studied using two E. coli and S. aureus bacteria. Table 2 lists the MBC values where both CuO and CuO/ZnO composite materials affect the S. aureus bacteria. However, the CuO samples failed in properly elimintaing the E. coli bacteria. Malwal et al. pointed out to the effect of ZnO/CuO composite on S. aureus instead of E. coli . Sakib et al. reported that upon increasing the amount of CuO in ZnO/CuO composites, the antibacterial activities of both bacteria would increase . Figure 2. SEM micrographs of the copper oxide particles synthesized in the presence of different surfactants: a) acetic acid, b) D200, c) SHMP, d) PVP, e) CTAB, f) SDS, g) urea, and h) M2P The composite samples exhibted better performance in terms of removing bacteria than the individual oxide . He et al. remarked that the antibacterial properties of CZ-ESM indicated improvement in their activity against S. aureus and E. coli, compared to single components, mainly due to the synergistic interaction of Zn2+ and Cu2+ ions . Without surfactant Acetic acid D200 SHMP PVP CTAB SDS Urea M2P M2P with Mn dopant Figure 3. Macro images of synthesized particles synthesized with different surfactants TABLE 1. Chromatic properties of the samples synthesized in the presence of different surfactants L* a* b* c* h* M2P with Mn dopant 37.26 -0.34 -0.25 0.43 216.21 M2P 36.31 -0.24 -0.21 0.32 220.37 D200 36.01 -0.34 -0.25 0.42 215.98 SHMP 35.26 -0.06 0.38 -0.38 99.24 TABLE 2. Chromatic properties of the samples synthesized in the presence of different surfactants E. coli S. aureus Bacteria Yield (%) Remained Yield (%) Remained 100 0 100 0 ZnO/CuO 100 0 99.5 3.5×104 100 0 100 0 99 3.5×104 100 0 CuO 97 3.5×104 100 0 92 5.5×104 100 0 Figure 4a shows the concentration changes (C/C0) of DR23 with pH=9 as a function of illumination time in the reactor under UV irradiation for ZnO/CuO composite and CuO powders synthesized in the presence of SHMP surfactants. The initial 30 min was considered as the dark interval. As illustrated, photocatlitic yield of ZnO/CuO composite powder (about 90 %) was more than that of CuO particles (about 64 %) mainly due to the narrower band gap of CuO (1.2-1.7) than that of ZnO (3.7 eV) . ZnO with a wide band gap can absorb UV irradiation properly and increase photocatalytic activity. The decrease in the DR23 concentration resulting from degradation was taken into account in the kinetic study. Given the low initial concentration of the DR23 solution, the reaction rate can be considered apparently first-ordered, as presented in following equation: Rate = -dC/dt = KαC (1) where Kα is the apparent rate constant, and C the concentration of DR23. The kinetic degradation order for the process using CuO and CuO–ZnO composite powders as photocatalysts was calculated by plotting (Ln(C/C0) versus irradiation time (Fig. 4b). The rate constants of the CuO–ZnO and CuO photocatalysis processes were calculated from the slopes which fitted the first-order kinetic equation (-Ln(C/C0)=kt). According to the findings, CuO and CuO–ZnO samples under UV irradiation represented the constant photocatalytic activity values equal to 0.23×10-2 and 1.2×10-2 min-1, respectively. P. Muhambihai et al. reported that NiO/CuO composite showed a higher degradation ability on Direct Red 80 dyes than that of ZnO/CuO . Wei et al. also reported that the photocatalytic reduction of Cr(VI) was obtained over the composite films with 0.73 atomic Cu/Zn ratios. The enhanced activity of CuO/ZnO composite films could be mainly attributed to the efficient separation of charges photogenerated in CuO/ZnO heterostructures . Zhu et al. remarked that the photocatalytic removal efficiency of phenol, in comaparison to that of the CuO/ZnO composite, was up to 78 % under the irradiation of the light, which was ∼2 and ∼4 times higher than those of the pristine ZnO and CuO, respectively . (a) Irradiation Time (min) (b) Irradiation Time (min) Figure 4. a) concentration changes (C/C0) and b) -Ln(C/C0) versus irradiation time of DR23 with pH=9 versus irradiation time UV irradiation for ZnO/CuO composite and CuO powders synthesized in the presence of SHMP surfactants 4. CONCLUSIONS In the present study, copper oxide and copper oxide/zinc oxide particles were successfully synthesized in the presence of different surfactants to investigate their effect on the morphology of particles. The main results are suammarized in the following: 1) Copper oxide powders with different morphologies in the forms of needle, round, and flake were synthesized in the presence of acetic acid, D200, SHMP, PVP, CTAB, SDS, urea, and M2P surfactants. 2) The chromatic properties of the powders indicated that the pigment synthesized in the presence of SHMP had a better and darker black color than that of the others. Therefore, it could be a suitable candidate for the black pigment in the ceramic industry. 3) Copper oxide powders exhibted a more proper anti-bacterial behavior than copper oxide/zinc oxide powders in dealing with S. aureus bacteria. 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Please cite this article as: Khosravi, M. D., Ghahari, M., Shafiee Afarani, M., Arabi, A. M., “Synthesis of CuO And CuO/ZnO Composite Powders for Antibacterial, Photocatalytic and Pigment-Related Applications”, Advanced Ceramics Progress, Vol. 8, No. 1, (2022), 1-8. https://doi.org/10.30501/acp.2022.329820.1082 2423-7485/© 2022 The Author(s). Published by MERC. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).
This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).