chromium (vi) adsorption behavior and capacity by surface modified nanozeolite a has been investigated. surface modification was performed and the morphology of modified and unmodified nanozeolite was studied using scanning electron microscope (sem) and transmission electron microscope (tem). adsorption isotherms were studied under different conditions (ph, adsorbent dose, adsorbate concentrati...

The European Union has banned chromium(VI) compounds in electrical and electronic equipment (EEE), such as chromate conversion coating films. Chromium(III) compounds are not banned. Using Raman spectroscopy without any preparation, we distinguished chromium(VI) oxide from chromium(III) oxide and chromium(III) hydroxide in chromate conversion coating films. Raman bands of chromium(VI) oxide were...

The most important solution in the new sodium chromate production process implemented in Alwernia Chemical Works is in-process recycling of chromic mud. This allows lessening the hazard to the natural environment resulting from released chromic waste. It also involves economical advantages. This paper presents studies on the optimisation of this process using of a fuzzy logic method. The influe...

In the title compound, [Cd(2)Cr(2)O(8)(C(12)H(8)N(2))(4)]·2H(2)O, which was obtained by hydro-thermal reaction of CdCO(3) and phenanthroline with K(2)CrO(4) at 393 K, two distorted Cd(N(4)O(2)) octa-hedra are linked through μ(2)-bridging chromate anions, forming a centrosymmetric tetra-nuclear eight-membered ring complex. The water mol-ecules link the chromate O atoms via inter-molecular O-H⋯O ...