Activated carbons produced by pyrolysis of waste potato peels: Cobalt ions removal by adsorption

Zero-Cost Agricultural Wastes as Sources for Activated Carbons Synthesis: Lead Ions Removal from Wastewaters

“…At the final studied pH-value (6), the trend of increase was midler (84%). In general similar pH-behavior was found in other published work regarding some heavy metals removal [20,26,27], meaning low uptake at acidic and higher at neutral-alkaline conditions. As it was mentioned previously, the effect of pH was studied until pH = 6, due to some possible precipitation phenomena which may be governed the whole removal process at pH > 7.…”

“…Those thermodynamic parameters at the optimum pH found (6), at fixed initial Pb(II) concentrations (10, 100, 300, 700 mg/L) and all temperatures (20,30,40, 50 °C) were presented in Table 2.…”

“…Some samples have clear holes on the surface or some of them have smooth surface. The latter can be probably due to the synthesis procedure followed [20]. The activated carbons were also measured regarding their Specific Surface.…”

“…In the present study, based on our previous experience/knowledge in activated carbons and low-cost adsorbent materials [4,5,[13][14][15][16][17][18][19][20][21], activated carbons were produced from agricultural wastes by hydrothermal treatment of potato peels. All samples were activated using KOH at 400 °C.…”

“…The equilibrium data were repeated similarly at 4 different temperatures (20,30,40, 50 °C) in order to result the respective thermodynamic evaluation of this system. Based on the fact that 4 different temperatures was examined in equilibrium, the respective thermodynamic analysis was done in order to export some very important parameters as enthalpy, entropy and free energy for the system.…”