This study assesses teh potential of activated carbon prepared from sewage sludge for nickel ions adsorption from aqueous solutions. Activated carbon physicochemical properties were determined. Batch adsorption experiments were performed as a function of pH solution, adsorbent dose, initial metal ions concentration, contact time and temperature. Teh experimental data were analyzed by teh La...

A simple and rapid spectrophotometeric procedure has been established for quantization of Ni(II) at trace levels. The reagent isonicotinohydroxamic acid (INHA) reacts with nickel(II) at pH < 10 and form a 1:2 lemon green complex. The complex has a maximum absorption at 610 nm with the molar absorptivity of 1.44x10 L molcm. Beer’s law is obeyed over the range of 0.32-4.80 μgmL. The Sandell’s sen...

Heavy metal’s release without treatment poses a significant threat to the environment. Heavy metals are non-biodegradable and persistent. In the present study the ash of water hyacinth (Eichhornia crassipes), was used to remove six metals from aqueous solutions through biosorption. Results of batch and column experiments showed excellent adsorption capacity. Removal of lead, chromium, zinc, cad...

Nickel plays a critical role in the mining industry. However, presence of nickel primary source sulfide minerals is decreasing. Focus has since turned to laterite ore, which contains up 80% Ni metal. The purpose this study was optimize leaching using sulfuric acid and conduct kinetic analysis discover mechanism that best controls process. To operating conditions, response surface method (RSM) w...