Sébastien Déon

University of Bourgogne Franche-Comté · Institut UTINAM (UMR CNRS 6213)

The main challenge for a widespread use of nanoporous membranes in the removal of ionic contaminants lies in the adjustment of their physicochemical properties to allow adequate ion rejection and mitigate fouling based on the targeted application. Most of the commercial membranes are negatively charged and their use is thus not necessarily relevant...

Commercial membranes often exhibit difficulties in rejecting specific ionic species, and especially multivalent cations, due to their usual negative charge. To face this drawback, it is proposed here to functionalize the membrane surface by allylamine plasma polymerization. The impact of this modification on both permeation flux and ion rejection i...

Mechanisms governing the rejection of ions from multi-ionic solutions, and especially the selectivity between various anions are not fully understood at the present time. In this study, it is proposed, in a first part, to investigate the evolution of electric and dielectric exclusion mechanisms when anions are mixed in a solution. For this purpose,...

Although many knowledge models describing the rejection of ionic compounds by nanofiltration membranes are available in literature, they are all used in full recycling mode. Indeed, both permeate and retentate streams are recycled in order to maintain constant concentrations in the feed solution. However, nanofiltration of real effluents is impleme...

Among the various technical options for removing ionic contaminants from wastewaters, membrane processes and especially their coupling with polymer addition has proved to provide worthwhile prospects for the removal of metal cations. Nevertheless, their use for the removal of anionic pollutants such as oxyanions has been little studied in literatur...

Membrane processes have demonstrated their enormous potential for water treatment, either by removing organic and mineral contaminants before permeating stream discharge, or by concentrating high added-value compounds in retentate stream [...]

This work addresses the specific interactions between titania membrane and fluoride anions during ultrafiltration operation. In general, the salt transmission increases with salt concentration when pure salt-water solutions are ultrafiltrated, except for fluoride-based salts observed in our study, for which transmission decreased at low concentrati...

In this study, hydrophilic activated carbon has been prepared and used to synthesize innovative activated carbon/polysulfone mixed matrix membranes (MMMs). These membranes were investigated in terms of membrane morphology, hydrophilicity, antifouling ability, and metal ions rejection. The activated carbon (AC) was prepared from a simple chemical ac...

Simple yet powerful strategy is developed for the fabrication of iron oxide doped aluminium oxide composite nanoparticles and investigated its role in membranes as novel nanoadditives for achieving excellent productivity and selectivity upto 120 h.

Worldwide contamination of waters by metals, metalloids, and organometallic pollutants is a major health issue. In particular, the occurrence of the selenium metalloid at rather high concentrations in the environment, especially in the water compartment, is of increasing concern, notably in developing countries. Selenium is difficult to remove from...

Water scarcity is one of the major issues that has put economic growth, societal stability, and ecosystem balance unstable. Wastewater reuse has been recognised as a viable method for securing potable water supply. Due to its inherent advantages over pressure-driven and energy-intensive reverse osmosis (RO), forward osmosis (FO) is one of the most...

Water is the elixir of life and the most elementary need for the survival of the human beings on planet Earth. With rapid industrialization, globalization and human exploitation, natural water...

The assessment of physicochemical parameters governing the transport of ions through nanoporous membranes is a major challenge due to the difficulty in experimental estimation of the dielectric constant of the solution confined in nanopores and the volumetric membrane charge. Numerical identification by adjusting their values to fit experimental da...

To meet the rising global demand for water, it is necessary to develop membranes capable of efficiently purifying contaminated water sources. Herein, we report a series of novel polysulfone (PSf)/GO-vanillin nanofiltration membranes highly permeable, selective, and fouling resistant. The membranes are composed of two-dimensional (2D) graphite oxide...

Removal of heavy metal ions from water is being a challenge and Polysulfone (PSf) membranes have shown great potential to remove them from contaminated solutions. In this work, the introduction of Graphitic carbon nitride nanosheets (g-C3N4) into PSf membranes was implemented to improve the permeability and separation performance of PSf membranes....

After major pollution by nitrates and pesticides, soils and groundwater in some parts of the world are now facing the emergence of a third major issue of selenium (Se) contamination. Selenium occurrence in ecosystems results naturally from weathering of Se-containing rocks, and is further aggravated by human activities. Selenium is ubiquitous in th...

Heavy metal removal from water resources is essential for environmental protection and the production of safe drinking water. In this direction, Zinc doped Aluminium Oxide (Zn:Al2O3) nanoparticles were incorporated into Polysulfone (PSf) to prepare mixed matrix membranes for the efficient removal of heavy metals from water. These Zn:Al2O3 nanoparti...

A novel high-performance nanofiltration membrane was fabricated by a simple and scalable route involving in situ cross-linking of hydrophilic, cheap, and environmentally friendly vanillin as antifouling agent with poly-sulfone (PSf) for salt rejection performance. Vanillin acts as a porogen, which induces a negative surface charge on the membrane s...

Owing to the less energy consumption, positive impact on the environment, and prospect of providing clean water resources, anion exchange membranes (AEMs) are promising materials for acid recovery from various industrial wastewater/effluent. Based on the diffusion dialysis process, AEMs selectively allow rapid proton permeation while efficiently re...

Call for submission of research articles or comprehensive reviews, which could be published in the Special Issue on "Numerical Modelling in Membrane Processes" of the journal Membranes.

The aim of this study was to optimize the operational conditions of the coagulation-flocculation process for the clarification of leachate from the landfill Technical Center of Souk-Ahras city. Three coagulants (ferric chloride, aluminum sulfate and ordinary alum) were tested and two types of agitation (mechanical and ultrasound) were implemented....

Membrane technology has raised considerable interest in sustainable water purification over the past decade. The development of antifouling membranes is always the basic approach to address the omnipresent bottlenecks of the membrane fouling. In this study, AlSi 2 O 6 nanoparticles were synthesized using a coprecipitation technique and their influe...

Reclaiming of wastewaters contaminated by heavy metals has become a major challenge over the last decades. For this reason, nanoporous membrane processes have awaken the interest of industry and local community, and the possible ways to improve their performances has become a priority goal for researchers. Metal removal enhancement by polymer addit...

The efficient removal of Endocrine Disruptive Chemicals (EDCs) namely oxybenzone and atrazine using polysulfone (PSf) composite membranes is reported in this article. A negatively charged hydrophilic mixed matrix membrane was prepared by using Polyaniline modified halloysite nanotubes (PANi-HNT) and polysulfone. The X-ray diffraction (XRD) and atte...

This work focuses on the selectivity modification of ceramic membranes after a mild alkaline treatment. Filtration of pure salt-water solutions was carried out with commercial titania membranes before and after the treatment. After treatment, the rejection of NaF significantly decreased, while the rejection of NaCl and NaBr increased. Additionally,...

Extraction of ethanol from aqueous solutions with or without salts by emulsion liquid membranes (ELMs) was investigated. The important parameters governing the extraction behavior of ethanol were analyzed. These parameters were surfactant concentration and nature, type of diluents, volume ratio of membrane phase to internal phase, emulsification ti...

Polymer assisted ultrafiltration (PAUF) is a relatively new process in water and wastewater treatment and the subject of an increasing number of papers in the field of membrane science. Among the commercial polymers used, poly(ethyleneimine) and poly(acrylic acid) are the most popular to complex numerous metal ions. Recently, there is increasing in...

Herein, an attempt has been made to prepare a novel membrane with good efficiency for removal of heavy metal ions namely lead (Pb), cadmium (Cd) and chromium (Cr). 4-amino benzoic acid (ABA) was covalently grafted onto the poly vinyl chloride (PVC) backbone by C-N bond to enhance the hydrophilicity. ¹H NMR and ATR-IR spectroscopy analysis confirmed...

Up to now, the SEDE (Steric Electric and Dielectric Exclusion) model was used to describe solute rejection in nanofiltration or membrane potential measurements. This model uses four fitting parameters: pore size, thickness to membrane porosity ratio, volume charge density (X) and dielectric constant of the solution inside pores (ep). Because these...

The methodology of tangential electrokinetic measurements with hollow fiber (HF) membranes was investigated. Two cell configurations were used, one configuration in which HF were immersed in the measuring solution and another one in which HF were embedded in a gel. The experiments were conducted with hydrophilic polysulfone HF of different lumen cr...

The dielectric and electric properties of the isolated active layer of an NF membrane were determined by electrochemical impedance spectroscopy (EIS). To our knowledge, this was the first attempt aimed at assessing the above properties from measurements performed directly on the active layer alone. Experiments were conducted with Desal DK membrane...

In this study, the feasibility of implementing a pressure-driven membrane process to remove toxicity from industrial discharge waters was investigated. Several kinds of membranes from reverse osmosis (RO) to tight ultrafiltration (UF) were tested and nanofiltration (NF) was found to be the most relevant process for such a problematic. The performan...

In this study, a transport model is used to characterize structural and physico-chemical changes in a nanofiltration membrane during the filtration of ionic mixtures. The membrane state is analyzed by a set of four model parameters identified from glucose and salts filtration: the membrane water permeability, the mean pore radius, the membrane char...

A mordenite membrane was prepared and surface characterizations were performed on the synthesized mordenite (as powder form). The surface charge remained constant when mordenite powder was in contact with the studied solutions. A pore diameter of 5.8 × 10–9 m was estimated. Filtration tests of single salt–water solutions (NaCl, NaF, and Na2SO4) wer...

The present study is devoted to the validation of a new method for in line electrokinetic characterisation of deposits on membrane surfaces. This method is based upon simultaneous measurements of transversal streaming potential and permeates flux at constant pressure before and during the deposit formation. Dead-end filtration experiments were cond...

Modeling of mass transport through nanofiltration membranes has seen an increasing expansion over the last decades in view of proposing predictive tools. Many models were devoted to the prediction of separation by NF and the model proposed here is classically based on the extended Nernst–Planck equation and equilibrium partitioning at the interface...

In order to investigate the significance of "salting-out" and "pore swelling" effects on the nanofiltration of neutral solutes, rejection properties of two NF ceramic and polymeric membranes were studied with single polyethyleneglycol (PEG) solution and mixed PEG/inorganic electrolyte solutions. For both membranes, the rejection rate of PEG was fou...

One of the major difficulties for the prediction of separation performances in the case of multi-ionic mixtures nanofiltration lies in the description of the concentration polarization phenomenon. Usual models available in literature do not take account of the polarization phenomenon or only describe it cursorily. Very few studies dedicated to the...

This article has been removed: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).

The zeta-potential is an important and reliable indicator of the electrokinetic charge density. Streaming potential measurement is the most commonly used tool for determining the zeta-potential of membranes. Measurements of streaming potential can be performed in a transversal or tangential mode. Even if the tangential mode is used for some 15 yrs...

This article has been removed: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).

This article has been removed: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).

This article has been removed: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).

Prediction of ions rejection by nanofiltration membranes is of prime importance for many industrial or environmental applications. For this purpose, many knowledge models were developed in the last decades to understand which phenomena govern the selectivity between various ions. In the present work, the possibility of predicting salts rejection by...

In the present work, a knowledge model is used to investigate the possibility of predicting the separation of ionic mixtures. In the model, the transfer through the membrane is based upon the classical vision coupling the Donnan, steric and dielectric exclusions at the interfaces with the extended Nernst–Planck transport equation within the pores....

The electrokinetic properties of hollow fiber polymer membranes were investigated from tangential streaming current/streaming potential and electric conductance measurements. The experiments were conducted with a number of fibers n between 1 and 10 and for three fiber lengths l. The quite good linearity of (i) streaming current/potential data versu...

Although the electrokinetic characterisation of particle deposits during filtration is of a great importance for better understanding of the mechanisms involved in the deposit build-up, few studies have been devoted to this characterisation so far. The present study focuses on the description and validation of a method for in situ and real time ele...

In the present work, rejection of mineral salts by nanofiltration membranes is modeled by a new knowledge model considering a charge distribution along the membrane pores. The model is classically based upon the coupling between the extended Nernst–Planck equation of transport within the pores with the Donnan, steric and dielectric interfacial excl...

Nanofiltration is a membrane process which is used to separate charged molecules such as ions. Even if this process is well known, there is no mean to predict the performances of a given separation. The aim of this paper is to present a two-dimensional model called “pore and polarization transport model” which includes all the steps of the ions tra...

This work focuses on the study of adsorption phenomena of magnesium chloride upon an ultrafiltration mineral membrane. Two experimental protocols are studied: first, filtration tests are carried out immediately after filling the pilot plant tank and secondly after contact during 12 h with the magnesium chloride solution. The operating performances...

The membrane potential technique was applied to a nanofiltration polyamide membrane to determine its mean pore radius and the dielectric constant of electrolyte solutions inside pores. To our knowledge, this is the first attempt to assess these features from membrane potential measurements. Membrane potential data were analyzed by means of the SEDE...

Commercial ceramic low cut-off (1 kDa) ultrafiltration TiO2 membrane behavior is studied in the presence of single salt solutions (NaCl and MgCl2: 5.10− 2 M). Surface property characterizations of the membrane layer are carried out on TiO2 powder. Zetametry and streaming induced potential experiments show that the isoelectric point of TiO2 remains...

Rejection rate measurements were carried out with a single polyethyleneglycol (PEG) solution and mixed PEG/inorganic salt solutions for a nanofiltration polyamide membrane. It was observed that PEG rejection is significantly lower in mixed-solute solutions, i.e. when a salt is present (KCl, LiCl, MgCl2 and K2SO4), and that rejection rate drop incre...

In this paper, a knowledge model is used to describe the rejection of ionic components in various proportions obtained by mixing two salts (NaCl and Na2SO4 or NaCl and MgCl2). This model is based on a description of the transport within the pores via the extended Nernst–Planck equation and the steric, electric and dielectric exclusion phenomena at...

Selectivity prediction of charged solutions separation by nanofiltration membranes with a two-dimensional (2-D) model, combining transport through the membrane and polarization layer (PPTM) is presented. Pore transport is based on the Donnan Steric Pore Model (DSPM) with dielectric reassessment, and transport within the polarization layer is modele...

Nanofiltration is a very useful separation process having many industrial and environmental applications. The prediction of separation performances requires the understanding of the various physical phenomena governing the solute transfer through the membrane. In this paper, a two-dimensional model called the pores and polarization transport model...

This paper investigates the hydrodynamic behavior of oil-polluted sands in a cold bubbling bed. The minimum fluidization velocity of sand increased with the oil content of the bed. The quality of fluidization was assessed by measured and calculated coefficients and also by the power spectral density analysis of the pressure fluctuations. The increa...