We explored the adsorption process spontaneity in a temperature range of 300-1000 K (Fig. ). At room temperature (300 K), the adsorption free energy (ΔGads) of the As-PhosO and As-Phos complexes is negative, denoting a spontaneous adsorption process. The In our case, the As-Phos and As-PhosO complexes show an enthalpic governed reaction, which has also been described for the As2O3 adsorption onto carbonaceous surfaces .