| Popis: |
The shells of RicinodendronHeudelotii, an agricultural waste, were used to prepare magnetic activated carbon. To do this, activated carbon was prepared by chemical activation with NaOH. By co-precipitation with iron II and iron III ions, magnetic carbon (MG-AC) is obtained. These materials were characterized using scanning electron microscopy (SEM), nitrogen gas adsorption measurements at -196°C, energy dispersive X-ray fluorescence and a vibrating sample magnetometer. The results showed that MG-AC had 86.5% Fe2O3and higher magnetic properties with a magnetic saturation of 75 emu.g-1. The Brunauer-Emmett-Teller (BET) surface area and pore volume of MG-AC were determined as 86.52 m2.g-1and 0.168 cm3.g-1respectively. The removal of methylene blue on these two materials (AC and MG-AC) was done in the absence and in the presence of hydrogen peroxide. In the absence of, methylene blue adsorbs on these materials according to a pseudo order 2 kinetics with rates of 0.0047 and 0.0039 g.mg-1.min-1respectively for AC and MG-AC. This adsorption can be described by the Langmuir model with maximum adsorption amounts of 13.4 and 9.6 mg.g-1respectively for AC and MG-AC. The addition ofleads to the production of hydroxyl radicals thanks to the presence of iron on MG-AC. Over 4 cycles of use Activated Carbon based on RicinodendronHeudelotii removed 99.6% of MB in the 1st cycle and only 5.23% due to the considerable loss of mass, while MG-AC removed this dye at 94.6% in the first cycle and 68.44% in the 4th cycle. There is therefore less loss of mass during the regeneration of MG-AC which still remains efficient after 4 cycles. |
