Title: Wuhan University Journal of Natural Sciences

Title: XXX Congress of the International Union of Leather Technologists & Chemists Societies, Proceedings

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? Tang, K.Y., Zheng, X.J., Tu, L.M. and Shelly, D.C. (2009), Study on the adsorption kinetics of water vapor on collagen fibers. XXX Congress of the International Union of Leather Technologists & Chemists Societies, Proceedings, 56-60.

Abstract: The adsorption behaviors and adsorption kinetics of water on collagen fibers was investigated. It is shown that water uptaking on collagen fiber is rapid in the first 6 hours, followed by a slower rate until equilibrium is reached. The water adsorption on collagen fibers at equilibrium (water adsorption capacity, Me) increases with increasing the relative humidity of the environment. The more the relative humidity of the environment is, the longer the time is needed to reach equilibrium. Both the Lagergren first-order adsorption kinetics model and the second-order adsorption kinetics model were employed to analyze the experimental data, while the second-order adsorption kinetics model presented a better correlation to the experimental data, suggesting that there are chemical bonds in the adsorption. Intra-particle diffusion plots showed multi-linearity with three distinct stages: initial curved portion, followed by intermediate linear portion and then, a plateau. It was proposed that the water adsorption process in the intermediate linear part should be controlled by intra-particle diffusion. The linear plots, not passing through the origin, indicated that the intra-particle diffusion was not the only one factor controlling the water adsorption rate.

Keywords: Adsorption, Adsorption Capacity, Adsorption Kinetics, Adsorption Rate, Capacity, Chemical, Collagen, Collagen Fiber, Collagen Fibers, Correlation, Data, Diffusion, Environment, Equilibrium, Experimental, Fibers, First, First Order, Hide, Intra Particle Diffusion, Intra-Particle Diffusion, Intraparticle Diffusion, Kinetics, Kinetics Model, Leather, Model, Origin, Second Order, Second-Order, Water, Water Adsorption, Water Adsorption Capacity

? Huang, X., Ren, T., Chen, J., Liao, X.P. and Shi, B. (2009), Preparation of un-tanned pig skin waste-loaded metal ions adsorbents and their adsorption behaviors to fluoride, Phosphate and arsenate in aqueous solutions. XXX Congress of the International Union of Leather Technologists & Chemists Societies, Proceedings, 243-253.

Abstract: Leather making process inevitably produce skin wastes due to the operation of splitting, trimming and shaving. The production of un-tanned skin waste is increasing since the wet-white technology is widely adopted. The un-tanned skin wastes are characterized by a high content of collagen protein. Considering the high activity of collagen protein towards many metal ions, it is feasible to obtain low-cost adsorbents by the reaction of un-tanned skin waste with different metal ions such as Fe(III) and Zr(IV), which can be applied for the effective removal of fluoride, phosphate and arsenate from aqueous solutions. In this study, two kinds of adsorbents, un-tanned pigskin waste-loaded Fe(III) or Zr(IV) (denoted as: UPW-Fe or UPW-Zr), were prepared and batch adsorption experiments were carried out to evaluate their adsorption behaviors, including the effect of pH, adsorption isothermal, as well as the adsorption kinetics. As a result, both UPW-Fe and UPW-Zr exhibited excellent adsorption capacities and fast adsorption rate to fluoride, phosphate and arsenate in aqueous solutions. These investigations provide a promising alternative utilization of an-tanned skin waste.

Keywords: Activated Carbons, Adsorbents, Adsorption, Adsorption Capacities, Adsorption Isothermal, Adsorption Kinetics, Adsorption Rate, Alternative, Aqueous Solutions, Arsenate, Batch, Batch Adsorption, Chrome Shavings, Collagen, Cr(III), Experiments, Fe(III), Fluoride, Investigations, Ions, Isothermal, Kinetics, Leather Waste, Low Cost, Low Cost Adsorbents, Low-Cost Adsorbents, Metal, Metal Ions, Operation, Oxide, pH, Phosphate, Protein, Removal, Skin, Solutions, Technology, Un-Tanned Skin Waste, Utilization, Waste, Zr(IV)