Ahmida El Achari

A novel glycoconjugated N-acetylamino aldehyde hydrazone azo dye as chromogenic probe for cyanide detection in water

A new selective chemodosimeter probe of cyanide anions in aqueous media was developed by the introduction of a simple glyco-conjugated o-(carboxamido) aldehyde hydrazone into an azo dye as chemodosimeter that recognizes cyanide anions among other competing anions such as acetate, dihydrogen phosphate, fluoride through reversible covalent bonding. The sensing properties of the new materials were investigated in pure water and have demonstrated a very high selectivity toward the cyanide anions. The detection limit of the new chromogenic probe was measured to be 1.29 μM which is much lower than most recently reported chromogenic probes for cyanide determination.

Water soluble and fluorescent copolymers as highly sensitive and selective fluorescent chemosensors for the detection of cyanide anions in biological media

We report a simple colorimetric method based on a water soluble polymer (WSP) for the sensitive and selective detection of cyanide in a biological solution. The WSPs were prepared from a radical polymerization of a methacrylate with a cyanide chemosensor moiety based on a coumarin–dicyano-vinyl derivative motif, and the polymer was then rendered water soluble by copolymerizing this hydrophobic monomer with other glyco-conjugated methacrylate derivatives. The lowest concentration for the quantification of cyanide ions was 0.05 μM, and the polymer exhibited nearly no calorimetric response to the presence of other common anions. Therefore, the chemical incorporation of some carbohydrates, as lactose or its usual monosaccharide moieties (glucose, lactose), represents a new method for the implementation of polymers for the detection of cyanide anions in water, exhibiting both good selectivity and efficiency.

Finishing of polypropylene fibers with cyclodextrins and polyacrylic acid as a crosslinking agent

The present paper deals with the functionalization of polypropylene (PP) fibers with cyclodextrins (CDs) in the presence of polyacrylic acid (PAA) as a crosslinking agent. Evidence of modification was proved via the formation of a crosslinked polymer formed between PAA and CDs. This polymer physically adhered to the fiber network and was resistant to hot water washings. The influence of parameters involved in this specific textile processing, such as the curing conditions (temperature, time) and the CDs dilution of the impregnating bath were investigated. The PAA was then compared, in terms of functionalizing rate, to the citric acid (CTR) and the 1,2,3,4-butanetetracarboxylic acid, which are known as crosslinking agents. Fibers modified by PAA and four types of CDs were characterized by evaluating the contact angle with a polar liquid and by studying the hysteresis of damping of PP fibers (Cahn balance) with various functionalization rates. Infrared spectroscopy and morphological studies confirm the presence of the crosslinked CD polymer that coated on the fibers, and allowed us to evaluate the chemical heterogeneity of the functionalized surfaces. The mechanical characterization of the PP fabrics functionalized with various proportions of CDs revealed that the functionalization reaction does not affect the mechanical properties of the native fabric.

Efficient removal of heavy metals from aqueous solution by chitosan-coated geotextiles based on polyethylene terephthalate

Abstract Novel functionalized geotextiles were prepared through chemical functionalization of the polyethylene terephthalate (PET) non-woven material by chitosan by using a coating technique with sodium tripolyphosphate (TPP) as the cross-linking agent. The prepared functionalized geotextiles were characterized by using different surface analyses and they show that the chitosan was successfully coated on PET non-woven materials. The ability of the prepared geotextiles to remove some heavy metals (Cu2+, Ni2+, Co2+) from the aqueous solution was also evaluated.Graphical Abstract