Wastewater remediation with ZnO photocatalysts: Green synthesis and solar concentration as an economically and environmentally viable route to application

Strategies to Enhance ZnO Photocatalyst's Performance for Water Treatment: A Comprehensive Review

“…Thus, a facile, green, economical, template‐free route is highly demanded for the fabrication of ZnO nanostructure from the view of both scientific research and practical application [129,130] . Miotello et al fabricated ZnO via a green synthesis method via garlic bulbs and chemical method through a standard co‐precipitation for comparative solar photocatalytic studies [18] . They found that the green‐synthesized ZnO exhibited a favorable photocatalytic activity in colloidal suspension for the methylene blue dye degradation upon exposure to concentrated sunlight.…”

“…[129,130] Miotello et al fabricated ZnO via a green synthesis method via garlic bulbs and chemical method through a standard co-precipitation for comparative solar photocatalytic studies. [18] They found that the green-synthesized ZnO exhibited a favorable photocatalytic activity in colloidal suspension for the methylene blue dye degradation upon exposure to concentrated sunlight.…”

“…Advanced oxidation processes using conventional and nonconventional mirrors technology represent an effective alternative for the removal of the pollutants. [18] The use of conventional mirrors can block the reflection of UV portion and this can reduce the yield of reactions depending on the material properties absorbing UV. This method can be broadly divided into two categories: (i) degradation of pollutant species occurs in a single phase, also known as the homogeneous system; (ii) degradation of pollutant species occurs in multiple phases, also known as the heterogeneous system.…”

Síntesis verde de materiales nanoestructurados de ZnO en la degradación de contaminantes orgánicos por medio de la fotocatálisis heterogénea

“…Fotocatálisis Tiempo % degradación Colorante [39] Nitrato de zinc Citrus aurantifolia [40] Acetato de zinc dihidratado Mimosa pudica [41] Acetato de zinc dihidratado Chromalena odorata [42] Nitrato de zinc Citrus reticulata [43] Nitrato de zinc Corn husk [44] Nitrato de zinc Allium sativum 120 69 Azul de metileno [45] Acetato de zinc dihidratado Viburnum opulus [46] Nitrato de zinc Punica granatum [11] Acetato Fuente: elaboración propia.…”

Comparison of photocatalytic activity of ZnO, Ag-ZnO, Cu-ZnO, Ag, Cu-ZnO and TPPS/ZnO for the degradation of methylene blue under UV and visible light irradiation

“…The one-dimensional ZnO rod has the ability to provide natural channels resulting in little resistance for charges during the redox reactions (ZnO þ hυ → znO (h þ vb þ e À cb )), which can facilitate the electron transfer and promote reaction rates (Pare et al 2008). Regardless of innovative fabrication techniques to use of ZnO for degradation of MB under solar light with good result (El Golli et al 2021), the pure ZnO, with large direct band gap energy of 3.37 eV at room temperature with photo activity at UV light, cannot efficiently make use of the solar spectra, because the solar spectra contain only 4% UV light (Guillen & Herrero 2006). The doping of metal ions in ZnO nanostructures can lead to effects such as extending their optical absorption to the visible range (Wang et al 2015;Ebrahimi et al 2019), fluorescence enhancement, and controlling concentration of surface defects.…”