Visible-light-driven photocatalysis of anisotropic silver nanoparticles decorated on ZnO nanorods: Synthesis and characterizations

KNbO3/ZnO heterojunction harvesting ultrasonic mechanical energy and solar energy to efficiently degrade methyl orange

“…9 a shows the transient photocurrent (PC) response of ZnO, KNbO 3 , and KNbO 3 /ZnO composites under simulated sunlight irradiation. ZnO electrode displays higher photocurrent response than KNbO 3 , indicating its better capability in separating electron-hole pairs and higher photocatalytic activity [48] , [49] , [50] . This finding is consistent with Fig.…”

Metal Oxide-Based Photocatalytic Paper: A Green Alternative for Environmental Remediation

“…Several techniques have been reported to produce metal oxide nanostructures or thin films, including chemical bath deposition [82,83], the sol-gel method [84], electrospinning [83,85], electrodeposition [86,87], magnetron sputtering [88][89][90], laser assisted flow deposition (LAFD) [91,92], spray pyrolysis [93,94], and hydrothermal/solvothermal synthesis, either by conventional or by microwave assisted heating [36,62,[95][96][97][98][99], and several other methods have been employed. With such a variety of production methods reported, several different nanostructures were described, including nanowires, nanorods, nanofibers, nanotubes, nanobelts, nanowhiskers, nanospheres, tetrapods, nanosheets, and many others [13,71,[100][101][102][103][104][105]. The 1D nanostructures, which include the nanofibers, nanotubes, nanobelts, nanowhiskers, nanorods and nanowires, are extensively investigated for photocatalysis due to their slower electron-hole recombination resulting in higher photocatalytic oxidation rates.…”

“…The most common are one-dimensional nanostructures, such as nanorods, nanotubes, nanofibers, nanowires, but also nanoplates, nanosheets, nanospheres, tetrapods, and nanoflowers, among others, have been described (Figure 11) [204][205][206][207][208][209]. To produce such a variety of structures, numerous and distinct techniques have been reported, including direct precipitation [210], the sol-gel method [211,212], hydrothermal [213,214] and solvothermal syntheses [101], microwave synthesis [96,97,215], chemical bath deposition [216], electrospinning [217], electrodeposition [218], electrospinning [102,105], magnetron sputtering [219,220], and spray pyrolysis [221], among others. [204], (b,c) ZnO nanoplates [204], (d) ZnO tetrapods [222], (e) ZnO nanosheets [205], (f) ZnO nanospheres [206], (g) ZnO nanotubes [207], (h) ZnO nanoflowers [209], and (i) aligned ZnO nanowire arrays [208].…”

The effect of excitation light source and humidity to photocatalytic activity of g-C3N4 nanosheets for NO removal

“…Furthermore, for evaluating the photocatalytic activity of g-C 3 N 4 nanosheets for NO removal, we conducted the measurement procedure as our previous study under different excitation light sources listed as shown in Table 1 12 . In addition, the calculation formula of photocatalytic NO removal efficiency, NO 2 conversion, NO oxidation efficiency into green products, and kinetic reaction rate k value was explicitly presented in our previous works 8,12 . Moreover, we also experimented with different humidity conditions (70%, 40%, and 20%) to deeply investigate the photocatalytic activity of g-C 3 N 4 nanosheets.…”

“…For instance, TiO 2 , ZnO, SnO 2 are traditional semiconductors that have been widely studied in the photocatalytic field for many decades. Still, most of them are limited by a few factors such as large bandgap, small specific surface area, complicated synthesis method that have restricted the applicability of the photocatalytic method 5,8,9 . Recently, the novel material graphitic carbon nitride (g-C 3 N 4 ) has been widely studied and known as a polymeric metal-free semiconductor for use in photocatalytic fields such as wastewater treatment, water-splitting, and pollutant gas treatment 10 .…”