The present study takes into account the consumer requirement of an even more massive use of touch screen devices, where the leather has to compete with the modern textile fibers in terms of technological performances, with particular reference to the newest technologies for the production of conductive gloves and other kinds of conductive goods, like shoes, garments, and others. Most of the known technologies able to provide materials with a unique ability to discharge static electricity and conductivity comparable with the human body concern the use of textile fibers. On the other hand, the goal of the present work is to delve into the application of technologies for leather matrix, with particular reference to the use of carbon-based nanomaterials, and attention to economical and/ or practical aspects.
A novel approach, based on chitosan heavy-metal sequestrating ability, is proposed for chromium(III) removal from spent tanning liquor. Experimental results, obtained at lab-scale using real wastewater, are presented and discussed. Resulting efficiencies are extremely high, and strongly dependent on chitosan dose and pH value. Comparative analyses with other polysaccharides is also carried out showing that amine groups are more efficient than carboxyl and sulphate ones. Chromium recovery from sorption complexes and chitosan regeneration is finally proposed to optimize the whole process.
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