The removal of chromium(VI) from an aqueous solution using persimmon gel was examined. The amount of chromium(VI) removed was strongly affected by the pH of the solution, with all chromium(VI) being removed at pH 2 or lower. However, in a solution containing, 15 mg dry weight of immobilized persimmon gel, the amount of removed chromium(VI) decreased as the pH increased. A part of chromium(VI) w...

We performed first-principles calculations on the structural and electronic properties of chromium nitrides under high pressure. Based crystal structure predictions, we identified several novel nitrogen compounds pressure-induced phase transitions in Cr–N system from ambient pressure to 200 GPa. The dynamic stable compounds—CrN2, CrN6, Cr2N3—are studied through both phononic calculations. This ...

Most often, reagent methods are used to treat wastewater from Cr (VI) compounds. This treatment technology allows reducing the concentration of in only. Comparing composition after chromium compounds using Ca(OH)2 with established standards, it can be concluded that is necessary purify a number pollutants. In this study, afterpurification production by ultrafiltration and reverse osmosis was co...

Some metal compounds, including arsenic, beryllium, cadmium, chromium and nickel have long been recognized as human and animal carcinogens, while for other as antimony, cobalt, lead and vanadium their carcinogenic action are probable or possible. Except chromium (VI), carcinogenic metals are only weak mutagens in mammalian cells and often inactive in bacterial assays. Since the mutagenicity in ...

Different types of activated carbon were prepared by chemical activation of brewer's spent grain (BSG) lignin using H(3)PO(4) at various acid/lignin ratios (1, 2, or 3g/g) and carbonization temperatures (300, 450, or 600 degrees C), according to a 2(2) full-factorial design. The resulting materials were characterized with regard to their surface area, pore volume, and pore size distribution, an...