Polymeric membranes for membrane reactors

2013 ◽  
pp. 3-41 ◽  
Author(s):  
J. Vital ◽  
J.M. Sousa
Keyword(s):  
Polymeric Membranes ◽  
Membrane Reactors

Enzyme immobilization on/in polymeric membranes: status, challenges and perspectives in biocatalytic membrane reactors (BMRs)

2011 ◽  
Vol 13 (7) ◽  
pp. 1609 ◽  
Author(s):  
Peter Jochems ◽  
Yamini Satyawali ◽  
Ludo Diels ◽  
Winnie Dejonghe
Keyword(s):  
Enzyme Immobilization ◽  
Polymeric Membranes ◽  
Membrane Reactors

scholarly journals Photocatalytic Membranes in Photocatalytic Membrane Reactors

Processes ◽  
2018 ◽  
Vol 6 (9) ◽  
pp. 162 ◽  
Author(s):  
Pietro Argurio ◽  
Enrica Fontananova ◽  
Raffaele Molinari ◽  
Enrico Drioli
Keyword(s):  
Large Scale ◽  
Advanced Oxidation Processes ◽  
Multidisciplinary Approach ◽  
Polymeric Membranes ◽  
Sustainable Growth ◽  
Membrane Reactors ◽  
Factors Affecting ◽  
Main Factors ◽  
Critical Overview

The present work gives a critical overview of the recent progresses and new perspectives in the field of photocatalytic membranes (PMs) in photocatalytic membrane reactors (PMRs), thus highlighting the main advantages and the still existing limitations for large scale applications in the perspective of a sustainable growth. The classification of the PMRs is mainly based on the location of the photocatalyst with respect to the membranes and distinguished in: (i) PMRs with photocatalyst solubilized or suspended in solution and (ii) PMRs with photocatalyst immobilized in/on a membrane (i.e., a PM). The main factors affecting the two types of PMRs are deeply discussed. A multidisciplinary approach for the progress of research in PMs and PMRs is presented starting from selected case studies. A special attention is dedicated to PMRs employing dispersed TiO2 confined in the reactor by a membrane for wastewater treatment. Moreover, the design and development of efficient photocatalytic membranes by the heterogenization of polyoxometalates in/on polymeric membranes is discussed for applications in environmental friendly advanced oxidation processes and fine chemical synthesis.

scholarly journals The Evolution of Photocatalytic Membrane Reactors over the Last 20 Years: A State of the Art Perspective

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 775
Author(s):  
Raffaele Molinari ◽  
Cristina Lavorato ◽  
Pietro Argurio
Keyword(s):  
Wastewater Treatment ◽  
Membrane Fouling ◽  
Polymeric Membranes ◽  
Membrane Reactors ◽  
Water And Wastewater Treatment ◽  
Know How ◽  
Degradation Reactions ◽  
Water And Wastewater ◽  
Year 2000 ◽  
Synthesis Reactions

The research on photocatalytic membrane reactors (PMRs) started around the year 2000 with the study of wastewater treatment by degradation reactions of recalcitrant organic pollutants, and since then the evolution of our scientific knowledge has increased significantly, broadening interest in reactions such as the synthesis of organic chemicals. In this paper, we focus on some initial problems and how they have been solved/reduced over time to improve the performance of processes in PMRs. Some know-how gained during these last two decades of research concerns decreasing/avoiding the degradation of the polymeric membranes, improving photocatalyst reuse, decreasing membrane fouling, enhancing visible light photocatalysts, and improving selectivity towards the reaction product(s) in synthesis reactions (partial oxidation and reduction). All these aspects are discussed in detail in this review. This technology seems quite mature in the case of water and wastewater treatment using submerged photocatalytic membrane reactors (SPMRs), while for applications concerning synthesis reactions, additional knowledge is required.

Palladium-Loaded Polymeric Membranes for Hydrogenation in Catalytic Membrane Reactors

2011 ◽  
pp. 531-548 ◽  
Author(s):  
V. V. Volkov ◽  
I. V. Petrova ◽  
V. I. Lebedeva ◽  
V. I. Roldughin ◽  
G. F. Tereshchenko
Keyword(s):  
Polymeric Membranes ◽  
Membrane Reactors ◽  
Catalytic Membrane ◽  
Catalytic Membrane Reactors

scholarly journals Critical Issues and Guidelines to Improve the Performance of Photocatalytic Polymeric Membranes

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 570 ◽  
Author(s):  
Marta Romay ◽  
Nazely Diban ◽  
Maria J. Rivero ◽  
Ane Urtiaga ◽  
Inmaculada Ortiz
Keyword(s):  
Process Intensification ◽  
Polymeric Membranes ◽  
Membrane Reactors ◽  
Factors Affecting ◽  
Aqueous Streams ◽  
Critical Issues ◽  
Synthesis Methodology ◽  
Recovery Problem ◽  
Technological Competitiveness ◽  
Selection Of

Photocatalytic membrane reactors (PMR), with immobilized photocatalysts, play an important role in process intensification strategies; this approach offers a simple solution to the typical catalyst recovery problem of photocatalytic processes and, by simultaneous filtration and photocatalysis of the aqueous streams, facilitates clean water production in a single unit. The synthesis of polymer photocatalytic membranes has been widely explored, while studies focused on ceramic photocatalytic membranes represent a minority. However, previous reports have identified that the successful synthesis of polymeric photocatalytic membranes still faces certain challenges that demand further research, e.g., (i) reduced photocatalytic activity, (ii) photocatalyst stability, and (iii) membrane aging, to achieve technological competitiveness with respect to suspended photocatalytic systems. The novelty of this review is to go a step further to preceding literature by first, critically analyzing the factors behind these major limitations and second, establishing useful guidelines. This information will help researchers in the field in the selection of the membrane materials and synthesis methodology for a better performance of polymeric photocatalytic membranes with targeted functionality; special attention is focused on factors affecting membrane aging and photocatalyst stability.

SEM/FESEM imaging of lamellar structures in melt extruded polyethylene films

1992 ◽  
Vol 50 (2) ◽  
pp. 1142-1143
Author(s):  
R.T. Chen ◽  
M.G. Jamieson ◽  
R. Callahan
Keyword(s):  
Imaging Techniques ◽  
Membrane Surface ◽  
High Stress ◽  
Extrusion Direction ◽  
Polymeric Membranes ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Crystalline Polymers ◽  
Lamellar Structures ◽  
Resolution Imaging

“Row lamellar” structures have previously been observed when highly crystalline polymers are melt-extruded and recrystallized under high stress. With annealing to perfect the stacked lamellar superstructure and subsequent stretching in the machine (extrusion) direction, slit-like micropores form between the stacked lamellae. This process has been adopted to produce polymeric membranes on a commercial scale with controlled microporous structures. In order to produce the desired pore morphology, row lamellar structures must be established in the membrane precursors, i.e., as-extruded and annealed polymer films or hollow fibers. Due to the lack of pronounced surface topography, the lamellar structures have typically been investigated by replica-TEM, an indirect and time consuming procedure. Recently, with the availability of high resolution imaging techniques such as scanning tunneling microscopy (STM) and field emission scanning electron microscopy (FESEM), the microporous structures on the membrane surface as well as lamellar structures in the precursors can be directly examined.The materials investigated are Celgard® polyethylene (PE) flat sheet membranes and their film precursors, both as-extruded and annealed, made at different extrusion rates (E.R.).

Low-voltage field-emission SEM of polymeric membranes for glucose biosensors

1990 ◽  
Vol 48 (3) ◽  
pp. 860-861
Author(s):  
Lorna K. Mayo ◽  
Kenneth C. Moore ◽  
Mark A. Arnold
Keyword(s):  
Glucose Sensor ◽  
Low Voltage ◽  
Glucose Sensors ◽  
Polymeric Membranes ◽  
Artificial Endocrine Pancreas ◽  
Self Monitoring ◽  
Conducting Materials ◽  
Insulin Dependent ◽  
Living Tissues ◽  
Voltage Scanning

An implantable artificial endocrine pancreas consisting of a glucose sensor and a closed-loop insulin delivery system could potentially replace the need for glucose self-monitoring and regulation among insulin dependent diabetics. Achieving such a break through largely depends on the development of an appropriate, biocompatible membrane for the sensor. Biocompatibility is crucial since changes in the glucose sensors membrane resulting from attack by orinter action with living tissues can interfere with sensor reliability and accuracy. If such interactions can be understood, however, compensations can be made for their effects. Current polymer technology offers several possible membranes that meet the unique chemical dynamics required of a glucose sensor. Two of the most promising polymer membranes are polytetrafluoroethylene (PTFE) and silicone (Si). Low-voltage scanning electron microscopy, which is an excellent technique for characterizing a variety of polymeric and non-conducting materials, 27 was applied to the examination of experimental sensor membranes.

Column: Polymeric Membranes

Polymer News ◽  
2004 ◽  
Vol 29 (8) ◽  
pp. 253-257
Author(s):  
Tejraj Aminabhavi ◽  
Udaya Toti ◽  
Mahaveer Kurkuri ◽  
Nadagouda Mallikarjuna ◽  
Lakshmi Shetti
Keyword(s):  
Polymeric Membranes
Sign in / Sign up

Export Citation Format

Share Document