Green synthesis of Ag/ZnO nanohybrid using sodium alginate gelation method

Highly efficient catalytic/sonocatalytic reduction of 4-nitrophenol and antibacterial activity through a bifunctional Ag/ZnO nanohybrid material prepared via a sodium alginate method

“…Meanwhile, the band characteristic of the hydroxyl group at about 3290 cm À1 disappears, maybe due to the elimination of the hydroxyl groups from sodium alginate aer its decomposition. 49,50 Moreover, the Zn-O band vibrations in the case of Ag/ ZnO and in the case of pure ZnO elaborated in a previous study 43 were compared. As shown in Fig.…”

“…52,53 Also, we noticed that the microstructure of all materials was affected by the presence of metallic silver and alginate decomposition, as explained in our previous work. 43 As the amount of silver was increased, the decomposition became less fast. 54 In fact, the silver cation affects both carboxylic and hydroxyl groups.…”

Supercritical CO2 drying of alginate/zinc hydrogels: a green and facile route to prepare ZnO foam structures and ZnO nanoparticles

“…In the case of the Alg/Zn-X1 sample, we showed the rst weight loss at 93 C due to the removal of the alcohol residues remaining aer CO 2 supercritical drying, while the second weight loss (54.09 wt%) and third weight loss (80.49 wt%) which occurred at 254 and 383 C respectively can be attributed to the thermal degradation of the alginate. 62 Thus, the Alg/Zn aerogel and xerogel were calcined at 500 C for 4 h under air wherein the Alg/Zn xerogel gave denite nanostructured zinc but this was not foamy in nature. All samples prepared in this study have been characterized by X-ray diffraction.…”

“…These ndings are in agreement with those obtained in our previous study. 62 The N 2 adsorption-desorption technique has been applied to determine the textural properties of all of the prepared samples. First of all, it should be noted that Alg/Zn xerogel beads are considered as non-porous materials since the corresponding N 2 adsorption-desorption isotherms were difficult to collect.…”

“…60,61 In the context of a series of research studies that we are leading dealing with porous nanomaterials, we were able to synthesize Ag/ZnO xerogels by an air drying process in a previous publication. 62 The as-obtained xerogels exhibit a shrunken random micro-structure with limited porosity and a low surface area. Aiming to compare the advantages of aerogel materials, in our present research study, we investigate the effect of a supercritical CO 2 drying process on the physicalchemical properties of ZnO materials.…”