The water precipitation products of Zn(NO3)2 and NaOH obtained by changing the combination of reactants and using lysozyme as an additive were studied. In the case of the single addition method, octahedral ε-Zn(OH)2 and plate-like β-Zn(OH)2 structures were formed in the absence and presence of lysozyme, respectively. These Zn(OH)2 samples were calcined at 700 °C to generate porous ZnO structures by preserving template crystals. When the zinc source was added dropwise to the NaOH solution, clover-like ZnO crystals were mainly obtained irrespective of the addition of lysozyme. Mixed spherical and elongated ZnO morphologies were observed when NaOH was added dropwise to the Zn(NO3)2 solution containing lysozyme. The lysozyme content of the precipitated product was estimated to be in the range of ~5-20%, and FTIR indicated no significant change in the conformation of lysozyme in the composite. These results suggest that the lysozyme-ZnO/Zn(OH)2 composite may have value as an antimicrobial material. Zinc oxide (ZnO) is used in a wide range of applications due to its specific chemical, surface and microstructural properties, including the manufacture of varistors, protective elements in electrical and electronic equipment, as gas sensors, catalysts, in the pigment industry as a hue, In cosmetics as a UV absorber etc. 1,2 There are many preparation techniques for zinc oxide in the literature zinc hydroxide
Zinc hydroxide carbonate was prepared from zinc nitrate by a simple low temperature (85 °C) aqueous urea process. The effect of different additives on the final particle morphology was investigated. In the presence of polyvinylpyrrolidone (PVP-K30), chrysanthemum-shaped porous spherical particles with an average particle size of 4 μm and a surface area of 16 m2/g were obtained. The ZnO particles formed after heat treatment maintained the size and shape of the hydrozincite precursor. The morphology and crystallinity of the obtained solids before and after heat treatment were characterized by FE-SEM, XRD, FTIR, BET and TG methods.