Ricerc@Sapienza

Many studies have demonstrated an inhibition of hydrogen permeance through a Pd or Pd-alloy membrane due to competitive adsorption of CO, ammonia and other species. Several corrections to Sieverts’ law were suggested to account for these effects, based on a Langmuir isotherm, but they all suffer from certain drawbacks as detailed below. We derive a new correction, based on the kinetic balances on the adsorbed layer, and on the underlying dissolved H layer from which the diffusing H atoms originate.

Producing culture media for microalgae from wastewaters may help reduce the culture management and wastewater treatment costs, but concomitant light limitation, nutrient restriction, toxic and growth-promoting effects complicate the preliminary data analysis and their subsequent exploitation.

In this work the shrinking core model was used for the mathematical modelling of Cu(II)/Fe(0)-induced chemical denitrification in aqueous system. The nano-zero valent iron particles have already been demonstrated their efficiency in the nitrate removal process, and various authors have investigated the influence of several parameters, such as pH and Fe(0)/NO3-molar ratio, on the process. In particular, the addition of a second metal, such as Cu, has proved to improve the kinetic of the overall process, allowing to reduce also the nano-particle surface passivation.