Removal of As(V) and Cr(VI) from aqueous solutions using solid waste from leather industry

Leather waste—Potential threat to human health, and a new technology of its treatment

“…Another promising application of solid tannery waste has been published in [16]-the waste serves as an adsorbent for removal of toxic Cr(VI) and As(V) from aqueous media. The sorption capacity is described by Langmuir and Freundlich isotherms.…”

Preparation, properties, and characterization of novel fine leather fibers/polyvinyl alcohol composites

“…Many solutions primarily focus on the following two parts: recovery of trivalent chromium (Cr 31 ) and extraction of collagen through hydrolysis of leather wastes for the further applications [7][8][9][10][11]. Furthermore, the chromed leather shavings can be also used to prepare activated carbon [12,13], absorbent of pollutions [14,15], degreaser [16], ceramic [17,18], etc. By contrast, the researches on incorporating the chromed leather shavings as functional reinforcements in polymer composites have gained much more importance [19][20][21][22][23].…”

Incorporation of mineral phosphorus and potassium on leather waste (collagen): A new NcollagenPK-fertilizer with slow liberation

“…4a) presented a different morphology from the natural leather (without chromium) related in the literature [20]. The fibrous aspect of the wet blue waste is probably due to presence of chromium in the leather [19]. It is interesting to observe that after P and K incorporation ( Fig.…”

“…This value is greater than previous adsorption capacities reported in the literature for other materials [19]. Therefore, the higher values of adsorption capacities for the leather waste at pH 6 can be explained by two possibilities: (I) complexation with the surface hydroxyl groups [17] and (II) electrostatic interaction due the presence of chromium (mainly on wet blue leather waste) in the protein structure [19].…”