Accepted Manuscript The catalytic effect of AQDS as an electron shuttle on Mn(II) oxidation to bir- nessite on ferrihydrite at circumneutral pH Shuai Lan, Xiaoming Wang, Peng Yang, Zhangjie Qin, Mengqiang Zhu, Jing Zhang, Fan Liu, Wenfeng Tan, Qiaoyun Huang, Xionghan Feng PII: S0016-7037(18)30706-3 DOI: https://doi.org/10.1016/j.gca.2018.12.018 Reference: GCA 11051 To appear in: Geochimica et Cosmochimica Acta Received Date: 26 May 2018 Accepted Date: 13 December 2018 Please cite this article as: Lan, S., Wang, X., Yang, P., Qin, Z., Zhu, M., Zhang, J., Liu, F., Tan, W., Huang, Q., Feng, X., The catalytic effect of AQDS as an electron shuttle on Mn(II) oxidation to birnessite on ferrihydrite at circumneutral pH, Geochimica et Cosmochimica Acta (2018), doi: https://doi.org/10.1016/j.gca.2018.12.018 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.