Emulsion Liquid Membranes Based on Os–NP/n–Decanol or n–Dodecanol Nanodispersions for p–Nitrophenol Reduction
Andreia Pîrțac,
Aurelia Cristina Nechifor,
Szidonia-Katalin Tanczos,
Ovidiu Cristian Oprea,
Alexandra Raluca Grosu,
Cristian Matei,
Vlad-Alexandru Grosu,
Bogdan Ștefan Vasile,
Paul Constantin Albu,
Gheorghe Nechifor
Affiliations
Andreia Pîrțac
Analytical Chemistry and Environmental Engineering Department, University POLITEHNICA of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
Aurelia Cristina Nechifor
Analytical Chemistry and Environmental Engineering Department, University POLITEHNICA of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
Szidonia-Katalin Tanczos
Department of Bioengineering, University Sapientia of Miercurea-Ciuc, 500104 Miercurea-Ciuc, Romania
Ovidiu Cristian Oprea
National Research Center for Micro and Nanomaterials, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania
Alexandra Raluca Grosu
Analytical Chemistry and Environmental Engineering Department, University POLITEHNICA of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
Cristian Matei
Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, University POLITEHNICA of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
Vlad-Alexandru Grosu
Department of Electronic Technology and Reliability, Faculty of Electronics, Telecommunications and Information Technology, University POLITEHNICA of Bucharest, 061071 Bucharest, Romania
Bogdan Ștefan Vasile
National Research Center for Micro and Nanomaterials, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania
Paul Constantin Albu
Radioisotopes and Radiation Metrology Department (DRMR), IFIN Horia Hulubei, 023465 Măgurele, Romania
Gheorghe Nechifor
Analytical Chemistry and Environmental Engineering Department, University POLITEHNICA of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
Membrane materials with osmium nanoparticles have been recently reported for bulk membranes and supported composite membrane systems. In the present paper, a catalytic material based on osmium dispersed in n–decanol (nD) or n–dodecanol (nDD) is presented, which also works as an emulsion membrane. The hydrogenation of p–nitrophenol (PNP) is carried out in a reaction and separation column in which an emulsion in the acid-receiving phase is dispersed in an osmium nanodispersion in n–alcohols. The variables of the PNP conversion process and p–aminophenol (PAP) transport are as follows: the nature of the membrane alcohol, the flow regime, the pH difference between the source and receiving phases and the number of operating cycles. The conversion results are in all cases better for nD than nDD. The counter-current flow regime is superior to the co-current flow. Increasing the pH difference between the source and receiving phases amplifies the process. The number of operating cycles is limited to five, after which the regeneration of the membrane dispersion is required. The apparent catalytic rate constant (kapp) of the new catalytic material based on the emulsion membrane with the nanodispersion of osmium nanoparticles (0.1 × 10−3 s−1 for n–dodecanol and 0.9 × 10−3 s−1 for n–decanol) is lower by an order of magnitude compared to those based on adsorption on catalysts from the platinum metal group. The advantage of the tested membrane catalytic material is that it extracts p–aminophenol in the acid-receiving phase.
