Study of the adsorption properties of lignocellulosic material activated chemically by gas adsorption and immersion calorimetry

Activated carbon from Diplotaxis Harra biomass: Optimization of preparation conditions and heavy metal removal

“…When the temperature is greater than 500°C, a decrease in the iodine number could be associated with the sintering effect of the volatiles matter and the shrinkage of the carbon structure, resulting in the narrowing and closing-up of the pores [36,37], as well as the widening of the pores, which means that many micropores were enlarged to mesopores [38]. At temperatures greater than 600°C, a decrease in the iodine number is caused by the both the temperature effect and the progressive evaporation of H 3 PO 4 , which leads to a reduction in the degradation of the tars that are responsible for the shrinkage of the pores [39]. With respect to the effect of the impregnation ratio on the iodine number, in the range of studied temperatures, the H 3 PO 4 assumes a role as a dehydration agent during activation, inhibiting the formation of tars and other liquids that could clog up the pores of the carbons.…”

Use of farming and agro-industrial wastes as versatile barriers in reducing pesticide leaching through soil columns

“…For the other pesticides, the maximum amount leached is lower than 0.1 g. The decrease in pesticide leaching by use of SCG can be attributed to its high content in lignocellulosic biomass (cellulose, hemicellulose and lignin). Lignocellulosic materials are commonly used as starting material for preparing activated carbon, a compound with high adsorption capacity [22]. A lignocellulosic substrate from the agro-industry was shown good as a low-cost and effective adsorbent for removal pesticides from soil [23] and wastewaters [24].…”

Study of Carbon Foams Synthesized by the Pyrolysis of Wastes Coconut Shells of African Palm at Different Conditions and use of Immersion Calorimetry as a Tool for Characterization

“…Figure 4 shows a typical thermogram The first peak corresponds to the heat generated by the contact of the porous solids with the respective immersion liquid and the second corresponds to the electrical calibration when an electrical work during a measured time is supplied. For a relation between the areas under the peaks it is possible to determine the value of the solid immersion enthalpy 15 .…”

“…Immersion calorimetry is used to ascertain, according to the system's thermodynamic conditions, the heat that is produced when a solid and a liquid come into contact, tantamount to the immersion enthalpy of the contact process, which is established for a specific quantity of the solid being studied. The resultant thermal effects of immersing a solid in a solvent, generally of the non-polar type, with which the solid does not present chemical interactions, can relate to the surface properties of the solid considered [15][16][17][18] .…”