Showing papers by "João G. Crespo published in 2005"
TL;DR: In this paper, the use of room temperature ionic liquids (RTILs) in supported liquid membranes (SLMs) has been evaluated and further studies were conducted in order to assess the SLMs' operational stability under dynamic conditions.
122 citations
TL;DR: In this article, the role of water in the mechanism of solute transport between aqueous phases, separated by a supported liquid membrane with ionic liquids, was evaluated using case-study solutes.
89 citations
25 May 2005
TL;DR: Green Chemistry and Environmentally Friendly Technologies (James H. Clark) as mentioned in this paper is a comprehensive overview of green chemistry for sustainable development with a focus on the separation process and its application in sustainable development.
Abstract: Foreword. Preface. List of Authors. Part 1: Green Chemistry for Sustainable Development. 1.1 Green Chemistry and Environmentally Friendly Technologies (James H. Clark). 1.2 Sustainable Development and Regulation (Diana Cook and Kevin Prior). Part 2: New Synthetic Methodologies and the Demand for Adequate Separation Processes. 2.1 Microreactor Technology for Organic Synthesis (G. Jas, U. Kunz, and D. Schmalz). 2.2 Solventless Reactions (SLR) (Rajender S. Varma and Yuhong Ju). 2.3 Combinatorial Chemistry on Solid Phases (Mazaahir Kidwai and Richa Mohan). Part 3: New Developments in Separation Processes. 3.1 Overview of "Green" Separation Processes (Richard D. Noble). 3.2 Distillation (Sven Steinigeweg and Jurgen Gmehling). 3.3 Green Enantiomeric Separations by Inclusion Complexation (Fumio Toda). 3.4 Chromatography: a Non-analytical View (Alirio E. Rodrigues and Mirjana Minceva). 3.5 Fluid Extraction. 3.6 Membrane Processes. 3.7 Nanostructures in Separation. 3.8 Separations Using Superheated Water (Anthony A. Clifford). Part 4: Concluding Remarks. Concluding Remarks (Carlos A. M. Afonso and Joao G. Crespo). Index.
75 citations
TL;DR: This work aims to present a comprehensive study about the macroscopic characteristics of globular vegetable proteins, in terms of their gelling ability, by understanding their molecular behaviour, when submitted to a thermal gelling process.
74 citations
TL;DR: In this paper, a catalyzed esterification reaction in the ionic liquid is studied, where one of the reaction products (water) is removed by pervaporation. But the results show that water removal from the reaction medium allowed shifting the reaction towards formation of the desired product.
69 citations
TL;DR: This work reports on the molecular interactions between room-temperature ionic liquids and Nafion and PDMS membranes, proving that in contact with these polymers RTILs behave like electrolytes rather than solvents.
35 citations
TL;DR: Sensitivity analysis revealed that the main impact on process performance stems from process operation rather than the physiological state of the biological culture, and that in the EMB configuration employed process operation history decisively impacts on the process outcome.
24 citations
TL;DR: This work proposes a biotechnological process for the remediation of vaccine production wastewaters based on the biological degradation of thiomersal to metallic mercury, under aerobic conditions, by a mercury resistant bacterial strain.
24 citations
TL;DR: In this paper, the equilibrium partitioning of model aroma compounds into a membrane polymer, poly(octylmethylsiloxane) (POMS), was studied, and linear sorption isotherms were determined in the concentration range relevant to subsequent pervaporation studies, both in aqueous solution as well as in presence of 10% of ethanol.
19 citations
TL;DR: In this article, chiral activated membranes have been tested for the enantioseparation of the racemic drug propranolol, using polysulfone (PS) based membranes.
Abstract: In this work, chiral activated membranes have been tested for the enantioseparation of the racemic drug propranolol. Polysulfone (PS)‐based membranes have been prepared for this purpose, using N‐he...
12 citations
TL;DR: High selective simultaneous removal of both pollutants was observed, in spite of their very different concentrations in the contaminated water.
TL;DR: Using the example of a membrane-supported biofilm reactor for industrial effluent treatment, different non-mechanistic approaches for the modelling of complex bioprocesses are presented and evaluated and the dynamic modelling approach was found to be superior, and process performance prediction was finding to be strongly dependent on the history of process operation.
TL;DR: The present study investigates the possibility of monitoring the bioproduction of a complex aroma profile with an analytical electronic aroma-sensing technique, the so-called "electronic nose", combined with a pervaporative sample enrichment method necessary to overcome the ethanol interference on the sensors' response.
Abstract: The present study investigates the possibility of monitoring the bioproduction of a complex aroma profile with an analytical electronic aroma-sensing technique, the so-called "electronic nose", combined with a pervaporative sample enrichment method necessary to overcome the ethanol interference on the sensors' response It presents in detail the development of a direct integrated pervaporation-electronic nose unit for a simple and fast analysis, which are key criteria for this technique to be broadly implemented The system developed was investigated using model solutions simulating the muscatel wine must fermentation It proved to be able to evaluate different relevant aroma compounds in solutions of varying degree of complexity, and also in the presence of ethanol, which is a major interference on the sensors' response to the aromas The transient sensors' response was investigated in detail, revealing information for sample discrimination and reducing the analysis time The system developed allowed a simple, fast, and selective analysis, therefore permitting a high sample throughput over time, with the possibility of fully automation
01 Dec 2005
TL;DR: In this paper, the application of membrane separations involving ionic liquids is discussed and discussed in detail, revealing the opportunities that exist for the still recent area of coupling membrane separation processes and ionic liquid.
Abstract: An overview will be given on the application of membrane separations involving ionic liquids. In particular, the use of pervaporation and supported liquid membranes for the recovery of solutes will be presented and discussed in detail, revealing the opportunities that exist for the still recent area of coupling membrane separation processes and ionic liquids.
TL;DR: The IEMB concept combines the transport of anionic pollutants through a dense mono-anion permselective membrane, with their simultaneous biodegradation to harmless products by a suitable microbial culture in a separated biocompartment as discussed by the authors.
Abstract: The presence of anionic micropollutants, such as bromate, perchlorate and nitrate, in drinking water supplies represents a risk for public health. This work evaluates the applicability of the ion exchange membrane bioreactor (IEMB) concept for their removal. The IEMB concept combines the transport of anionic pollutants, through a dense mono-anion permselective membrane, with their simultaneous biodegradation to harmless products by a suitable microbial culture in a separated biocompartment. The transport of the pollutant counter-ions (anions) is governed by the Donnan equilibrium principle and, therefore, it is possible to enhance it by using a more concentrated driving counter-ion (e.g. chloride) added to the biocompartment. The IEMB process proved to selectively remove nitrate and perchlorate to concentrations below the recommended levels of 4 ppb for ClO4 and 25 ppm of NO3 , from a model polluted stream containing 100 ppb of ClO4 and 60 ppm of NO3 . Transport studies, made under Donnan