Effect of Ho Substitution on Magnetic Properties of ZnCrSe.

A series of ZnCrHoSe microcrystalline spinels (where = 0.05, 0.075, and 0.

Ultrasound-assisted dispersive micro-solid phase extraction using molybdenum disulfide supported on reduced graphene oxide for energy dispersive X-ray fluorescence spectrometric determination of chromium species in water.

Molybdenum disulfide (MoS) was supported on graphene oxide (GO) by hydrothermal method. The resulting nanocomposite (MoS-rGO) was characterized by X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The experiments show that at pH 2, MoS-rGO has a great affinity for adsorption of hexavalent chromium ions while Cr(III) ions remain in aqueous sample.

Graphene oxide chemically modified with 5-amino-1,10-phenanthroline as sorbent for separation and preconcentration of trace amount of lead(II).

Graphene oxide (GO) was chemically functionalized with 5-amino-1,10-phenanthroline. The resulting conjugate (phen-GO) was characterized by scanning electron microscopy and X-ray photoelectron spectroscopy. The experiments show that phen-GO has a high affinity for extraction of Pb(II) ions.