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Eu-doped CdS quantum dots with the Eu dopant concentration in the range of 0.5–10% and zinc blende structure were successfully synthesized by a wet chemical method in the noncoordinating solvent.

In this work, we have carried out systematic studies on the critical role of polyvinyl pyrrolidone (PVP) and citrate in the well-known chemical reduction route to synthesize silver nanodecahedra (AgND).

Polycrystalline Ca 2 Fe 2Àx Al x O 5 (x = 0-1.4) samples were prepared by conventional solid-state reactions. Their crystalline/electronic structures and magnetic properties were characterized in detail. Powder X-ray diffraction analyses revealed that the samples crystallized in orthorhombic brownmillerite-type structures with the occurrence of the Pcmn-Ibm2 phase separation in the region between x = 0.4 and 0.6. The results obtained from analyzing Raman scattering and X-ray-absorption fine-structure spectra also indicated this phase separation. Although x in Ca 2 Fe 2Àx Al x O 5 varies in a wide range from 0 to 1.4, the +3 oxidation state of Fe remained almost unchanged. Magnetization measurements revealed that all Ca 2 Fe 2Àx Al x O 5 samples have weak ferromagnetic order, and both the saturation magnetization and coercive force are dependent on the temperature, x, and structure phases.

This study presents the modification of cassava root husk-derived biochar (CRHB) with ZnO nanoparticles (ZnO-NPs) for the simultaneous adsorption of As(iii), Cd(ii), Pb(ii) and Cr(vi).

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