Environmentally sustainable processes for the synthesis of ...
A ball mill of laboratory-scale running continuously for 48 h at 300 rpm was used to pulverize the treated shells into powder. The samples in powdery form were heated in a furnace to 1000 °C and 1200 °C at a rate of 5 °C/min. A combination of sodium hydroxide and deionized water in solution was used to remove the black coloration caused by ...