Study on the absorption effect of hydrolyzed hoof horn powder on cadmium ions

Abstract

Animal hoof horn has complex porous structure and rich keratin, crushed and sieved, adding 5% KOH in the quality of the hoof horn powder, and mixing at 1:5 ratio of solid to liquid, adding water at 121 °C, Hydrolysis at 2 atmospheric pressure for 5 hours, the horn powder was completely hydrolyzed into the hydrolysis products containing sulfhydryl and disulfide bonds, the hydrolysates of the powder were added into 50mg•L−1, 2.0mg•L−1 cadmium Ion solution, centrifuged for 17h and then centrifuged to detect the residual cadmium ions. The results showed that the best particle size was treated with 100 mesh fine mesh powder, the lowest residual Cd2+ concentration in the solution was over 75%, and the high concentration 50mg•L−1 was the best, the residual amount of Cd2+ was 14.887mg•L−1, the removal rate was 70.24%. The adsorption effect of the hydrolyzate of Hoof horn powder on cadmium ion solution with concentration of 2.0 mg•L−1 However, the effect was not significant. When the dosage reached 30ml, the residual amount of Cd2+ was reduced to 1.238mg•L−1 and the removal rate was 38.10%.

Effects of Inorganic and Organic Amendments on the Predicted Bioavailability of As, Cd, Pb and Zn in Kitchen Garden Soils

“…The application of CH effectively reduced the extractable Pb and Zn from the soils in this study. This product, when hydrolyzed, has been associated with the reduction of available aqueous Cd up to 50% depending on its particle size [77]. This effect was attributed to the production of peptides, oligopeptides, and free amino acids with strong ion binding capacities upon hydrolysis.…”