Eco-friendly and cost-effective synthesis of ZnO nanopowders by Tapioca-assisted sol-gel route

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [VZn+VO+] Defects in Self-Assembled ZnO Nanoparticles

“…55 Moreover, terpenoids present in aqueous leaf extracts of Azadirachta indica and Emblica officinalis are thought to be responsible for stabilizing and capping ZnO nanoparticles. 56 Previous studies 15,51 have also shown that the shape and size of ZnO nanoparticles are mainly controlled by the Zn 2+ ion affinity of incomplete binding between two glucose molecules of cassava starch. These last findings shed light on the tuning of hydroxyl group content in this starch medium to control the size, morphology, and growth reaction rate of the oxide nanoparticles.…”

“…Among these semiconductors, ZnO has been recognized as an excellent material for photocatalytic processes due to its high photosensitivity, nontoxic nature, low cost, and wide band gap (∼3.3 eV, at 300 K). 13,15 Nevertheless, some researchers have reported that ZnO still exhibits low photocatalytic efficiency, most likely because of its fast recombination of charge carriers and relatively low charge separation efficiency, and further modification is indeed required. 16−18 It is well-known that the properties of a material are strongly dependent on decreasing particle size and increasing surface area, defects, and so on.…”

“…Notedly, photocatalysts with nanostructured semiconductor metal oxides have been reported to exhibit significant efficiency in degrading some dyes in an aqueous solution under ultraviolet or visible-light irradiation. − In this sense, various semiconductor metal oxides, such as In 2 O 3 , Bi 2 O 3 , Fe 2 O 3 , TiO 2 , and ZnO, − have been used as photocatalysts for water decontamination. Among these semiconductors, ZnO has been recognized as an excellent material for photocatalytic processes due to its high photosensitivity, nontoxic nature, low cost, and wide band gap (∼3.3 eV, at 300 K). , …”

“…The use of biomass-based chelating agents in nanoparticle synthesis is quickly developing due to their growing success in forming high quality nanomaterials. Some of these biomass-based chelating agents include carbohydrates and plants extracts such as tapioca, starch, natural whey, aloe vera extract, and teca (Tectona grandis (L.)) leaf extract, which are low-cost biomasses with high availability in the tropical and subtropical parts of the world. The green synthesis of oxide nanoparticles has steadily opened new avenues for the sustainable consumption and production of eco-friendly materials.…”

Fabrication of zinc oxide‐coated microcrystalline cellulose and its application in truck tire tread compounds

“…Indeed, a chemical (wet) process plays a significant role in the synthesis of the ZnO with very small particle size, known as active ZnO (A-ZnO). This process could be done by a variety of techniques, for example, mechanochemical process, [4][5][6][7] controlled precipitation, [8][9][10] sol-gel method, [11][12][13][14][15] hydrothermal, [16][17][18][19][20] solvothermal, [21][22][23] sonochemical, [24][25][26][27] and so forth.…”