Recent developments in layer-by-layer assembled systems application in water purification

Chemosphere ◽  
2021 ◽  
Vol 270 ◽  
pp. 129477
Author(s):  
Claudiu-Augustin Ghiorghita ◽  
Marcela Mihai
Keyword(s):  
Water Purification ◽  
Layer By Layer ◽  
Recent Developments

scholarly journals A comprehensive review of recent developments in 3D printing technique for ceramic membrane fabrication for water purification

RSC Advances ◽  
2019 ◽  
Vol 9 (29) ◽  
pp. 16869-16883 ◽  
Author(s):  
Hitesh Dommati ◽  
Saikat Sinha Ray ◽  
Jia-Chang Wang ◽  
Shiao-Shing Chen
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Water Purification ◽  
Ceramic Membrane ◽  
Comprehensive Review ◽  
Membrane Fabrication ◽  
Printing Technique ◽  
Recent Developments ◽  
Competitive Prices ◽  
3D Printing Technique

Additive manufacturing (AM), which is also commonly known as 3D printing, provides flexibility in the manufacturing of complex geometric parts at competitive prices and within a low production time.

scholarly journals THE PREPARATION OF COMPOSITE MATERIALS BASED ON MAGNETITE NANOPARTICLES AND SODIUM ALGINATE FOR WASTE WATER PURIFICATION

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Ayse Z. Aroguz ◽  
Vesna Teofilović ◽  
Sinem Karademir ◽  
Ljiljana Tanasić ◽  
Sibel Aydogan ◽  
...  
Keyword(s):  
Waste Water ◽  
Composite Materials ◽  
Sodium Alginate ◽  
Water Purification ◽  
Magnetite Nanoparticles ◽  
Low Cost ◽  
Chemical Precipitation ◽  
Layer By Layer ◽  
Paper Manufacturing ◽  
Composite Beads

The use of synthetic chemical dyes in various industries, including plastics, paper manufacturing, cloth dyeing, printing and leather treatment, has increased considerably over the last years, resulting in the release of dye-containing effluents into the aquatic and soil ecosystems. There are many techniques to remove the waste after dying process (coagulation, chemical precipitation, reverse osmosis, extraction, filtration, biological treatment and adsorption). The releasing of dyes from many industrial plants is environmentally hazardous. The most important goal for the waste water purification is to find the low-cost adsorbents with high selectivity and long life. In our study, an effort has been made to prepare efficient composite materials for dyes removal from aqueous solution based on medium molecular weights deacetylated chitin i.e. poly(D-glucosamine) and a bio-degradable nontoxic anionic polysaccharide sodium alginate filled with magnetite nanoparticles. Alginate composite beads coated with poly(D-glucosamine) were prepared using layer-by-layer (LbL) deposition method. During the adsorption process the concentrations of dyes in solution waste were determined according to the general spectrophotometer method.

scholarly journals Top-Down Polyelectrolytes for Membrane-Based Post-Combustion CO2 Capture

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 323 ◽  
Author(s):  
Daria Nikolaeva ◽  
Patricia Luis
Keyword(s):  
Large Scale ◽  
Polymer Materials ◽  
Layer By Layer ◽  
Solvent Casting ◽  
Top Down ◽  
Layer Deposition ◽  
Recent Developments ◽  
Synthesis And Processing ◽  
Cost Efficient ◽  
Physical And Chemical

Polymer-based CO2 selective membranes offer an energy efficient method to separate CO2 from flue gas. ‘Top-down’ polyelectrolytes represent a particularly interesting class of polymer materials based on their vast synthetic flexibility, tuneable interaction with gas molecules, ease of processability into thin films, and commercial availability of precursors. Recent developments in their synthesis and processing are reviewed herein. The four main groups of post-synthetically modified polyelectrolytes discern ionised neutral polymers, cation and anion functionalised polymers, and methacrylate-derived polyelectrolytes. These polyelectrolytes differentiate according to the origin and chemical structure of the precursor polymer. Polyelectrolytes are mostly processed into thin-film composite (TFC) membranes using physical and chemical layer deposition techniques such as solvent-casting, Langmuir-Blodgett, Layer-by-Layer, and chemical grafting. While solvent-casting allows manufacturing commercially competitive TFC membranes, other methods should still mature to become cost-efficient for large-scale application. Many post-synthetically modified polyelectrolytes exhibit outstanding selectivity for CO2 and some overcome the Robeson plot for CO2/N2 separation. However, their CO2 permeance remain low with only grafted and solvent-casted films being able to approach the industrially relevant performance parameters. The development of polyelectrolyte-based membranes for CO2 separation should direct further efforts at promoting the CO2 transport rates while maintaining high selectivities with additional emphasis on environmentally sourced precursor polymers.

scholarly journals Bridging the gap between laboratory and application in photocatalytic water purification

2019 ◽  
Vol 9 (3) ◽  
pp. 533-545 ◽  
Author(s):  
Gylen Odling ◽  
Neil Robertson
Keyword(s):  
Water Treatment ◽  
Water Purification ◽  
Real World ◽  
Real World Application ◽  
Recent Developments ◽  
Number Of Publications

Despite a large number of publications in the field, photocatalytic water treatment is still somewhat disconnected from real world application and we highlight recent developments to address this.

Efficacy of CNT-bound polyelectrolyte membrane by spray-assisted layer-by-layer (LbL) technique on water purification

RSC Advances ◽  
2014 ◽  
Vol 4 (62) ◽  
pp. 32858-32865 ◽  
Author(s):  
Lei Liu ◽  
Moon Son ◽  
Hosik Park ◽  
Evrim Celik ◽  
Chiranjib Bhattacharjee ◽  
...  
Keyword(s):  
Water Purification ◽  
Layer By Layer ◽  
Ultrafiltration Membranes ◽  
Layer Technique ◽  
Polyelectrolyte Membrane ◽  
Surface Modified ◽  
Layer By Layer Technique

This study demonstrates anti-fouling properties of surface-modified polyethersulfone composite ultrafiltration membranes prepared by a spray-assisted layer-by-layer technique.

scholarly journals The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

2021 ◽  
Author(s):  
Pawel Sikora ◽  
Mehdi Chougan ◽  
Karla Cuevas ◽  
Marco Liebscher ◽  
Viktor Mechtcherine ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Construction Materials ◽  
Great Influence ◽  
Research Progress ◽  
Layer By Layer ◽  
Clay Nanoparticles ◽  
Three Dimensional Objects ◽  
Micro Particles ◽  
Recent Developments ◽  
Alkali Activated

AbstractAdditive manufacturing (AM), also referred as 3D printing, is a technology that enables building automated three-dimensional objects in a layer-by-layer manner. AM of cement-based and alkali-activated composites has gathered attention over the last decade and is one of the most rapidly developing civil engineering fields. Development of proper mixture compositions which are suitable in fresh and hardened state is one of the key challenges of AM technology in construction. As the behaviour of cement-based materials (CBM) and alkali-activated materials (AAM) is determined by chemical and physical processes at the nano-level, incorporation of nano- and micro-sized admixtures has great influence on the performance of printable composites. These modifications are attributed to the unique reactivity of nanoparticles associated with their small size and large surface area. This review paper summarizes recent developments in the application of nano- and micro-particles on 3D printable cementitious composites and how they influence the performance of 3D-printed construction materials. The research progress on nano-engineered CBM and AAM is reviewed from the view of fresh and hardened properties. Moreover, comparison between nano- and micro-sized admixtures including nanosilica, graphene-based materials, and clay nanoparticles as well as chemical admixtures such as viscosity-modifying admixtures and superplasticizers is presented. Finally, the existing problems in current research and future perspectives are summarized. This review provides useful recommendations toward the significant influence of nano- and micro-sized admixtures on the performance of 3D printable CBMs.

scholarly journals Layer-by-Layer Deposition: A Promising Environmentally Benign Flame-Retardant Treatment for Cotton, Polyester, Polyamide and Blended Textiles

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 432
Author(s):  
Eva Magovac ◽  
Bojana Vončina ◽  
Igor Jordanov ◽  
Jaime C. Grunlan ◽  
Sandra Bischof
Keyword(s):  
Flame Retardant ◽  
Inorganic Compounds ◽  
Green Technology ◽  
Layer By Layer ◽  
Covalent Bonds ◽  
Layer Deposition ◽  
Low Concentrations ◽  
Recent Developments ◽  
Finishing Processes ◽  
Oppositely Charged

A detailed review of recent developments of layer-by-layer (LbL) deposition as a promising approach to reduce flammability of the most widely used fibers (cotton, polyester, polyamide and their blends) is presented. LbL deposition is an emerging green technology, showing numerous advantages over current commercially available finishing processes due to the use of water as a solvent for a variety of active substances. For flame-retardant (FR) purposes, different ingredients are able to build oppositely charged layers at very low concentrations in water (e.g., small organic molecules and macromolecules from renewable sources, inorganic compounds, metallic or oxide colloids, etc.). Since the layers on a textile substrate are bonded with pH and ion-sensitive electrostatic forces, the greatest technological drawback of LbL deposition for FR finishing is its non-resistance to washing cycles. Several possibilities of laundering durability improvements by different pre-treatments, as well as post-treatments to form covalent bonds between the layers, are presented in this review.

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