Author
C. Allegre
Bio: C. Allegre is an academic researcher from Université Paul Cézanne Aix-Marseille III. The author has contributed to research in topics: Dyeing & Reactive dye. The author has an hindex of 5, co-authored 6 publications receiving 814 citations.
Topics: Dyeing, Reactive dye, Reverse osmosis, Nanofiltration, Brine
Papers
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TL;DR: In this article, the state of the art of different processes currently used for the treatment of dye house wastewaters and evaluated a four-step process to recover the water and the mineral salts, while leaving the spent dyes in the reject stream.
447 citations
TL;DR: A comparative review of the current legislations on the dyeing industry emissions is given, first in France and then in other countries around the world.
246 citations
TL;DR: The coagulation-flocculation-decantation process used to optimize water recovery from the concentrate shows that it is possible to recycle a great volume of water using a small decanter area, since the concentrate flow rate is low.
126 citations
TL;DR: In this article, a process for the treatment of used reactivedye baths which consists of four steps: pre-filtration, neutralization, nanofutration and reverse osmosis is presented.
54 citations
TL;DR: In this article, a feasibility study performed on a variety of nanofiltration membranes with different characteristics shows that for this membrane range the separation is poorly influenced by the membrane cut-off but greatly influenced by membrane chemistry.
18 citations
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TL;DR: This review outlines the preparation of MCCs as well as methods to characterize these materials using FTIR, XRD, TGA and other microscopy-based techniques to show their advantages as adsorbents in the treatment of polluted aqueous solutions.
579 citations
TL;DR: In this article, a comparison of the present decolorization/degradation techniques for water-sensitized azo dyes is presented, where the hierarchy of reduce, reuse, and degrade is adopted and measures are taken to remove color from the industrial discharge.
Abstract: Azo dyes represent the largest class of industrial colorants. These are no longer used only for the coloration of textiles, plastics, paints, inks, and lacquers, but rather serve as key components in high-tech applications such as optical data storage, reprographics, display devices, dye-sensitized solar cells, energy transfer cascades, light-emitting diodes, laser welding processes, or heat management systems. Azo dyes are also of growing importance in the medical and biomedical fields. In most of these applications, the color is largely irrelevant and it is the ability of the colorants to absorb visible electromagnetic radiation with high efficiency, or other functional property, that is exploited. With the growing awareness and environmental concerns, it is imperative that the hierarchy of reduce, reuse, and degrade be adopted and measures be taken to remove color from the industrial discharge. The present review (a) embodies a comparison of the present decolorization/degradation techniques for water-s...
511 citations
TL;DR: The results showed that under most cases Al(13) had significantly higher efficiency in removal of direct dyes than traditional Al salt and commercial PACl with the exception of Direct Red 28 removal under high pH range.
478 citations
TL;DR: In this article, the removal of methylene blue (MB) from aqueous solutions using a raw Algerian kaolin sample as a low-cost adsorbent was studied using a pseudo-second order model.
455 citations
TL;DR: The continuous two-dimensional imine-linked COF-LZU1 membrane with a thickness of only 400 nm was prepared on alumina tubes by in-situ solvothermal synthesis and shows excellent water permeance and outstanding water stability, rendering it an interesting system for water purification.
Abstract: Covalent organic frameworks (COFs) are attractive candidates for advanced water-treatment membranes owing to their high porosity and well-organized channel structures. Herein, the continuous two-dimensional imine-linked COF-LZU1 membrane with a thickness of only 400 nm was prepared on alumina tubes by in situ solvothermal synthesis. The membrane shows excellent water permeance (ca. 760 L m-2 h-1 MPa-1 ) and favorable rejection rates exceeding 90 % for water-soluble dyes larger than 1.2 nm. The water permeance through the COF-LZU1 membrane is much higher than that of most membranes with similar rejection rates. Long-time operation demonstrates the outstanding stability of the COF-LZU1 membrane. As the membrane has no selectivity for hydrated salt ions (selectivity <12 %), it is also suitable for the purification of dye products from saline solutions. The excellent performance and the outstanding water stability render the COF-LZU1 membrane an interesting system for water purification.
448 citations