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Preface 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, Mn oxides are widely applied as absorbents, ion sieves, chemical oxidants and catalysts for environmental remediation and pollution control. In the past, significant advances in Mn oxide geochemistry were achieved on the occurrence and mineralogy of Mn oxides in various geological settings, and greatly improved our ability to decipher the evolution processes, reactivity and environmental behavior of Mn oxides. There are, however, still many aspects poorly understood in terms of the environmental geochemistry of Mn 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. It is increasingly recognized that such knowledge is critical for better understanding both biogeochemical processes and environmental applications of Mn oxides. To better address the above knowledge gaps and present current advances on geochemistry of Mn oxides in multiple scientific disciplines, we organized a symposium entitled “Advances in Understanding the Environmental Geochemistry of Manganese (Mn) Oxides” at the 247th American Chemistry Society National Meeting in Dallas on March 16-20, 2014. The full proceedings of the symposium are available at http://geochemistrydivision.sites.acs.org/ acsspring2014sessions.htm. The symposium attracted approximately 100 scientists from the international environmental chemistry and geochemistry communities. Thirty two speakers, including 20 distinguished invited speakers gave presentations over two full-day oral sessions. Many cutting-edge findings and novel methodologies were reported, representing the state-of-the-art in the field of Mn oxide geochemistry. This book is based on the invited papers presented at the symposium, and aims to bring together advances on Mn 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 Mn 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 ix Feng et al.; Advances in the Environmental Biogeochemistry of Manganese Oxides ACS Symposium Series; American Chemical Society: Washington, DC, 2015.
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to todorokite, water-oxidation catalysis by Mn 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. To the best of our knowledge, no ACS symposium series has been published on a similar topic in the past 30 years. 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 Mn oxide biogeochemistry and the engineering application of Mn-bearing materials. It is also targeted for libraries in the above disciplines. The editors would like to acknowledge all the authors of the chapters for their excellent contribution and the anonymous reviewers for their excellent evaluation of the manuscripts. We are also grateful to the ACS Books editors, Tim Marney, Bob Hauserman and Lindsey Watson, for their kind assistance and patience throughout the publication process. We would like to thank all the speakers who participated in the symposium. X.F. thanks the National Natural Science Foundation of China (Nos. 40830527, 41271253 & 40971142) and M.Z. is grateful to the U. S. National Science Foundation under Grant No. EAR-1529937 for their financial support on the studies of manganese oxides.
Xionghan Feng Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture College of Resources and Environment, Huazhong Agricultural University Wuhan 430070, China +86-27-87280271 (telephone) +86-27-87282138 (fax)
[email protected] (e-mail)
Wei Li Key Laboratory of Surficial Geochemistry, Ministry of Education School of Earth Sciences and Engineering, Nanjing University Nanjing 210093, China +86-25-89680700 (telephone) +86-25-83686016 (fax)
[email protected] (e-mail)
Mengqiang Zhu Department of Ecosystem Science and Management University of Wyoming 1000 E. University Ave., Laramie, WY 82071 +1-307-766-5523 (telephone) +1-307-766-6403 (fax)
[email protected] (e-mail) x Feng et al.; Advances in the Environmental Biogeochemistry of Manganese Oxides ACS Symposium Series; American Chemical Society: Washington, DC, 2015.
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Donald L. Sparks Delaware Environmental Institute (DENIN) Department of Plant and Soil Science, University of Delaware 221 Academy St., Suite 250 Newark, DE 19716 +1-302-831-3436 (telephone) +1-302-831-6840 (fax)
[email protected] (e-mail)
xi Feng et al.; Advances in the Environmental Biogeochemistry of Manganese Oxides ACS Symposium Series; American Chemical Society: Washington, DC, 2015.
