2018, Aumeier, B., Dang, H.Q.A., Wessling, M.

Temperature swing adsorption (TSA) is a well-established process for gas purification. In this work, the feasibility of TSA in aqueous phase was studied. This concept could enable in situ adsorbent regeneration and thus fostering sustainable decentralized adsorption processes applied to water treatment. The adsorption processes with the use of granular activated carbon (GAC) have been widely applied to remove the residual amounts of pesticides in water treatment. Amitrole was chosen as a typical pesticide in this study, GAC was selected as the main adsorbent for amitrole removal. Adsorption isotherm experiments were conducted at different temperatures of 20°C, 57°C and 94°C to identify the most appropriate sorptive – sorbent system for dynamic adsorption and TSA research. Once the isotherm experiments were accomplished, breakthrough curve experiments were subsequently investigated. Finally, TSA process was conducted with the activated carbon regeneration at the elevated temperature of 125°C. Consequently, initial obtained results proved the feasibility of the proposed TSA technique for pesticide removal in aqueous phase.

2018, Kayser, S., Lüdge, A., Böttcher, K.

The major task for the Lateral-Photovoltage-Scanning-Method is to detect doping striations and the shape of the solid-liquid-interface of an indirect semiconductor crystal. This method is sensitive to the gradient of the charge carrier density. Attempting to simulate the signal generation of the LPS-Method, we are using a three dimensional Finite Volume approach for solving the van Roosbroeck equations with COMSOL Multiphysics in a silicon sample. We show that the simulated LPS-voltage is directly proportional to the gradient of a given doping distribution, which is also the case for the measured LPS-voltage.