Visible light driven exotic p (CuO) - n (TiO2) heterojunction for the photodegradation of 4-chlorophenol and antibacterial activity

Green Synthesis of CuO-TiO2 Nanoparticles for the Degradation of Organic Pollutants: Physical, Optical and Electrochemical Properties

“…For the CuO-NPs, a Cu-O bond vibration at around 516, 832, and 1052 cm −1 , which shows the formation of the CuO metal oxide, was noted [29,34]. The hydroxyl groups (-OH) from the C. benghalensis plant extract were responsible for the absorption bands at 1663 cm −1 (bending mode) and 3388 cm −1 (stretching mode), whereas the Cu-O stretching vibration mode was responsible for the formation of the absorption bands at 510, 832, and 1052 cm −1 [35,36]. Peaks associated with the bending and stretching vibrations of hydroxyl groups (OH) were seen in CuO-TiO 2 samples at ~1651 and 3356 cm −1 , respectively, and the Ti-O and Ti-O-Ti bands were also detected vibrating at 400-900 cm −1 [32].…”

“…The optical band gap energy (Eg) for all the CuO-TiO 2 nanocomposites was calculated based on the absorption spectrum of the samples according to the equation of E g = 1240/wavelength [23]. From the literature, Gnanasekaran et al [35] obtained a band gap of 2.98 eV, Muzakki et al [36] recorded 3.01 eV, and Chowdhury et al [27] obtained 3.17 eV. These studies used NaOH and urea as reducing agents.…”

Enhanced photocatalytic performance of anatase titania nanotubes via the synergistic effect of trace copper doping and oxygen vacancies

“…The main pollutants found in water include antibiotics, 5 fertilizers, pesticides, 6 heavy metal ions, 7 organic dyes, 8 and other harmful substances. 6,9,10 To solve these pollutants, researchers have developed a variety of purification methods, including membrane separation, 11 adsorption, 12 biodegradation, 13 chemical precipitation, 14 and photocatalysis, 15,16 among which photocatalysis has been widely studied due to its attractive advantages, including high efficiency, simple operation, complete degradation, and environmental friendliness. 17 The technology of photocatalysis has gained deep and extensive interest since its discovery.…”

Engineering cuboctahedral N-doped C-coated p-CuO/n-TiO2 heterojunctions toward high-performance photocatalytic cross-dehydrogenative coupling

“…The TiO 2 /CuO p–n heterojunction has been applied intensively in photocatalysis and green energy development. 20,22,23,28–48 Accordingly, diverse approaches have been employed to fabricate versatile TiO 2 /CuO composites, for instance, electrochemical process, wet impregnation, spinning, hydrothermal, sol–gel, microwave-assisted 40,43,45–48 and magnetron-sputtering methods. 20,39 Even so, the vast majority of the obtained catalyst hardly yields a large surface with concomitant well-defined morphology and high uniformity, 31 and those coated with N-doped carbon (N–C) are further subject to more difficulties.…”