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Industrialization and urbanization have now become major factors in damaging different segments of the environment. Synthesis of novel nanomaterials for the removal of dyes and free radicals from aqueous medium has become a challenge for the researchers. The present work describes formation of novel-franklinite (ZnFe2O4) nanoparticles (FNPs) which have been synthesized adopting economical route of green method using extracts of fresh and dried leaves of Coriandrum sativum. The fabricated NPs were characterized employing state of the art analytical techniques including UV-visible, FTIR, SEM and XRD. The nanocatalyst exhibited excellent catalytic properties for the degradation of eosin yellow up to 86 % in 22 min and 90 % in 16 min using zinc-ferrite NPs synthesized using dried and fresh leaves respectively. Antioxidant activity of ZnFe2O4in terms of DPPH and ABTS free radicals scavenging was also determined. Nanoparticles synthesized using fresh leaves exhibited better antiradical potential in comparison to NPs synthesized dried leaves. Therefore, synthesis of FNPs with active features can be achieved using extract of fresh plant. Franklinite NPs can be used as promising photocatalyst for the degradation of organic pollutants and scavenging of free radicals.

Visible light active, highly stable, nontoxic, and efficient photocatalysts based on 1 %, 3 %, and 5 % Mn@Co3O4were synthesized and functionalized with reduced graphene oxide. The X-rays diffraction (XRD) spectroscopy and FT-IR spectroscopy were employed for structural and functional group studies. Under visible light irradiation, photocatalytic activities of 1 %, 3 %, and 5 % Mn@Co3O4/rGO nanocomposites were studied for the degradation of organic pollutant methylene blue. Almost 85.4 %, 90.2 %, and 93.4 % degradation of methylene blue were observed after 80 min with 1 % Mn@Co3O4/rGO, 3 % Mn@Co3O4/rGO, and 5 % Mn@Co3O4/rGO respectively. The prepared nanocomposites followed pseudo-first-order kinetic studies. Among all samples, the 5 % Mn@Co3O4/rGO showed maximum degradation of 93.4 % in 80 min. Moreover, 5 % Mn@Co3O4/rGO nanocomposite maintained its excellent dye degradation ability even after three cycles.

Graphical Abstract:

Graphical abstract: Kinetic model of solute diffusion including MgZn2/Al-matrix interface is established based on the classical dissolution model.

One of the key issues involved in successfully achieving hydroxyapatite (HA) ceramic body without defects using colloidal processing technique, is the preparation of homogeneously high solid loading HA ceramic suspension. This could be achieved via controlling the HA powder properties. The maximum achievable solid loading suspension from the as received HA powder was found to be 14 vol%. The treatment of the as received powder via heat treatment process play a very versatile role in changing the physical properties of the powder. Owing to these changes, well dispersed high solid loading HA suspensions reaching 57 and 59 vol% were successfully prepared from HA powder heat-treated at 1000 and 1100 °C, respectively. The suspensions prepared from the heat-treated powder was found to have acceptable rheological properties for casting processes in terms of low particle interaction, lower number of floc and floc network and higher fluidity.

The precorneal drainage of radiolabeled solutions containing polyvinyl alcohol (PVA) or hydroxypropyl methylcellulose (HPMC) have been measured in rabbit and man by gamma scintigraphy. Concentration of the polymers was varied to produce solutions with a viscosity range between 10.2 and 102 mPas. Solution drainage was faster in man than in the rabbit with a more pronounced effect of viscosity. Significant retardation of drainage in man was noted at the higher polymer concentrations (0.9% HPMC or 5.85% PVA).

Degenerativ verfettetes Myokard enthÄlt je nach Ausma\ der Verfettung rund 14–19% Gesamtlipide, davon etwa 5–12% Neutralfett. Phosphatide und Cholesterin als strukturbildende Lipoide der Herzmuskelfaser haben, wie nach bekannten morphologischen Befunden zu erwarten, mit der degenerativen Myokardverfettung nichts zu tun.