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Friday June 20th
Day 1
Opening
Address
49th John Arthur
Wilson Memorial Lecture - Bi Shi, Sichuan
University, P.R. China
Diversified
Applications of Tanning Principles
Tanning is the basic chemical
reaction which can
transform hide or skin into leather. Some tannages,
like vegetable tanning, aldehyde tanning and metal
tanning, have been used by tanners for several
thousand years. The chemical principles of these
tannages have been clearly revealed in the last
decades, which have extremely improved technologies
of leather processing. At the same time, the
scientific essences involved in these principles are
enlightening our inspirations of diversified
applications of tanning methods to create a series
of novel functional materials based on skin
collagen. Herein, some ingenious applications of the
tanning principles were reported, which might
inspire more scientific ideas and imaginations of
leather chemists.
1. Based on the principle of
vegetable tanning, a novel adsorbent which can
selectively remove tannins from natural beverages
and medicinal plant extracts was devised. It was
prepared by processing skin into collagen fibers
with proper size. This new adsorbent showed to be
more effective for this purpose in comparison with
commonly used polyamides and macroreticular resins.
2. According to the principle of
vegetable-aldehyde combination tanning, tannins
which are able to complex with metal ions were
immobilized onto collagen matrix. As a result, the
tannin-immobilized adsorbent and membrane materials
were prepared. Both of them presented high
adsorption capacity for heavy metal ions, such as
Hg2+,
Pd2+,
Au3+,
UO22+
and Cu2+, in aqueous solutions and
therefore, are expected to be used for removing
toxic metal ions from wastewaters or separating
precious metals from mixed solutions.
3. By utilizing the principle of
metal tanning, a series of functional materials were
prepared by loading metal ions, such as Zr4+,
Fe3+ and Pt4+, onto collagen
fiber. The Zr4+ and Fe3+
loaded materials exhibited strong adsorption to
inorganic anions, such as F-, PO43-,
AsO43-, CrO42-
and V2O74-, in
aqueous solutions, showing potential to be used in
environmental protection. At the same time, Fe3+
and Pt4+ loaded materials have been
experimentally proven to be the heterogeneous
catalysts with high catalytic activity.
Meanwhile, as a special kind of metal-loaded
collagen fiber, the adsorption behaviours of
chrome-containing leather waste to organic compounds
in wastewater were also investigated. It presented
high adsorption capacity to dyes, surfactants and
aromatic acids.
4. In terms of
the principles of versatile metal-organic
combination tannings, a series of novel carbon fiber
and metal fiber materials with controllable
mesoporous structures were prepared by using
collagen fiber as the template. They are believed to
have great potentialities in selective adsorption,
chemical sensor and catalyst support.
Session 1 - |
8:00-8:15am
8:25-9:25am |
