Background: Chitooligosaccharides (COS) with degrees of polymerization (DP) 6 to 8 are degraded from chitosan, which possess excellent bioactivities. However, technologies that could purify them from hydrolysis mixtures in the narrow DP range (984 to 1,306 Da) are absent. The objective of this research is to purify DP 6 to 8 COS by nanofiltration on the basis of appropriate adjustments of the f...

chitosan/polyethersulfone (cs/pes) composite membrane was prepared from casting chitosan solution on polyethersulfone substrate membrane. the substrate membrane was prepared by phase inversion technique using polyethersulfone (pes) and dimethylacetamide (dmac) as solvent with and without the addition of polyvinylpyrrolidone (pvp) as pore-forming agent. the effects of the composition of the c...

in the present study, the production of low-salt water from salty water by nanofiltration as well as membrane fouling was investigated. furthermore, a new method was proposed and tested experimentally for creating the backpulse in order to minimization of fouling and increase of the filtration efficiency. in the proposed method, the permeate was used instead of gas for creating the backpulse. t...

Glyphosate is currently the herbicide with highest use worldwide for weed control. It has been detected in different water sources, including drinking water, which could be generating potential damage to human health. In Metropolitan Area of Cúcuta, intensive rice cultivation predominant, and as it grows flooded areas, herbicides greater contact bodies, are used sources supply. Based on this, c...

Titanium (Ti) nanoparticles (NPs) were successfully seeded on the platform of a polyacrylonitrile (PAN) ultrafiltration (UF) membrane previously coated with bio-glue (a co-deposition dopamine hydrochloric bicarbonate buffer having undergone pyrocatechol deprotonation). The tools in vogue, especially field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and a...

Thin film composite (TFC) membranes have been experiencing significant modifications recently aiming to improve their structure, properties and separation efficiency. One of the promising tailor more efficient is changing materials used. m -phenylene diamine (MPD), piperazine (PIP), trimesoyl chloride (TMC) are most common monomers used fabricate TFC membranes. Recent studies introduced several...

Would it not be nice to have an organic solvent nanofiltration membrane made from renewable resources that can be manufactured as simply as producing paper? Here the production of nanofiltration membranes made from nanocellulose by applying a papermaking process is demonstrated. Manufacture of the nanopapers was enabled by inducing flocculation of nanofibrils upon addition of trivalent ions.

Arsenic and selenium presence in acid mine waters (AMWs) limits their disposal due to environmental regulations. The focus solve the economic infeasibility is directed sustainable solutions, promoting resource recovery. In fact, rare earth elements (REEs) recovery proposed most of Iberian Pyrite Belt AMWs. However, arsenic may impact REEs Among different alternatives, nanofiltration (NF) provid...

This study focuses on a possible elimination of glucose from a sodium lactate fermentation broth by nanofiltration (NF). The results obtained with single-solute solutions indicate that glucose is clearly more retained that sodium lactate. Nevertheless, glucose retention strongly decreases when the two solutes are present in the same solution and the separation becomes unachievable. Such a incid...