Manganese (Mn) oxides are among the most reactive minerals in the
earth's surface environment, and play a significant role in
adsorption, co-precipitation and redox reactions, affecting
biogeochemical cycles of numerous nutrients and contaminants. In
addition, manganese oxides are widely applied as absorbents, ion
sieves, chemical oxidants and catalysts for environmental
remediation and pollution control. There are, however, still many
aspects poorly understood in terms of the environmental
geochemistry of manganese oxides, such as biogenic formation
mechanisms, detailed crystal structure of nanocrystalline phases,
electron transfer paths in redox reactions, adsorption mechanisms
of contaminants on surfaces, physiochemical factors controlling the
contents of structural Mn(III) and vacant sites that largely
determine Mn oxide reactivity, and the role of Mn(III) in the above
processes. This book aims to bring together advances on manganese
oxide environmental biogeochemistry from leading scientists in
multiple disciplines, e.g., mineralogy, geochemistry, soil science
and environmental engineering. A number of frontier research topics
are included in the book, such as in-situ characterization of Mn
oxide reactivity with As and Cr, kinetics and molecular-scale
mechanisms of metal oxidation by mangnese oxides, mechanistic
understanding of metal sorption through density function theory,
the role of surface edge sites of birnessites in metal(loid)
sorption, reactivity of natural crytomelane, pathways of
phyllomanganate transformation to todorokite, water-oxidation
catalysis by manganese oxides, in situ As immobilization using
stabilized Fe-Mn binary oxides, and synthesis of Li ion-sieves from
biogenic oxides and stability of colloidal Mn oxides. The book
should be of interest to scientists and engineers in a broad range
of disciplines, such as geochemistry, soil science, mineralogy,
microbiology, materials science, and environment engineering, as
well as graduate students who are engaged in research on manganese
oxide biogeochemistry and the engineering application of Mn-bearing
materials.
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