The Geochemical Processes Controlling Vacancy and Mn(III) Concentrations in Birnessite Structure

控制水钠锰矿结构中空位和 Mn(III) 浓度的地球化学过程

基本信息

  • 批准号:
    1529937
  • 负责人:
  • 金额:
    $ 27.37万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2015
  • 资助国家:
    美国
  • 起止时间:
    2015-08-01 至 2019-07-31
  • 项目状态:
    已结题

项目摘要

Soils, sediments and natural waters may become contaminated by toxic metals from anthropogenic sources, such as mining and industrial wastes, vehicle emissions, lead-acid batteries, paints, etc., threatening public health and ecosystem. Birnessite, the dominant type of wide-spread manganese (Mn) oxide mineral in the environment, is a metal scavenger and can hold several percentages of toxic metals of its body weight, hence acting as an effective detoxifying agent. The ability of birnessite to scavenge metals, as well as other properties, highly rely on its structure and chemical composition that are affected by unknown geochemical processes. The main objective of this funded research is to identify the geochemical processes and discover how they take place step by step, how rapidly they happen, as well as whether and how they are affected by common environmental conditions. Results will benefit not only the fundamental research on critical geochemical and mineralogical processes, but also industrial applications of Mn oxides, such as fabricating high-performance birnessite as sorbents and oxidizers for pollution control and as semiconductor for harvesting solar energy in the photovoltaic industry. The proposed study will train students at different levels. The PI and a high school teacher will work together to develop a curriculum in earth science for high school students.The extraordinary properties of birnessite are determined by Mn vacancy and Mn(III) concentrations in its structure. There is, therefore, a critical need to identify those geochemical processes that control birnessite vacancy and Mn(III) concentrations. In the absence of such knowledge, assessing contaminant fate and transport particularly in Mn-rich environments will remain challenging. We hypothesize that the reactions of Mn(II) with birnessite control the vacancy and Mn(III) concentrations, and that the reactions are subject to influences of solution chemistry and birnessite formation rates. Both microbially mediated and chemically-synthetic reaction systems will be employed. X-ray absorption spectroscopy, diffraction and atomic pair distribution function analysis, and high resolution transmission electron microscopy will be used to characterize birnessite samples in addition to wet chemical analyses. Results are expected to advance the current understanding while generating new knowledge of Mn oxide mineralogy and geochemistry and their impact on biogeochemical cycles.
土壤、沉积物和天然沃茨可能受到人为来源的有毒金属污染,如采矿和工业废物、车辆排放物、铅酸电池、油漆等,威胁公众健康和生态系统。水钠锰矿是环境中广泛分布的锰(Mn)氧化物矿物的主要类型,是一种金属清除剂,并且可以保持其体重的几个百分比的有毒金属,因此作为一种有效的解毒剂。水钠锰矿对金属的吸附能力以及其他性质高度依赖于其结构和化学成分,这些结构和化学成分受到未知地球化学过程的影响。这项资助研究的主要目标是确定地球化学过程,并发现它们是如何逐步发生的,它们发生的速度有多快,以及它们是否以及如何受到共同环境条件的影响。研究结果不仅有利于关键地球化学和矿物学过程的基础研究,而且有利于锰氧化物的工业应用,例如制造高性能水钠锰矿作为污染控制的吸附剂和氧化剂,以及作为光伏行业中收集太阳能的半导体。拟议的研究将培训不同层次的学生。PI和一位高中教师将共同为高中生开发一门地球科学课程。水钠锰矿的特殊性质取决于其结构中的Mn空位和Mn(III)浓度。因此,迫切需要确定控制水钠锰矿空位和Mn(III)浓度的地球化学过程。在缺乏此类知识的情况下,评估污染物的归宿和迁移,特别是在富锰环境中,仍将具有挑战性。我们假设Mn(II)与水钠锰矿的反应控制空位和Mn(III)的浓度,并且该反应受到溶液化学和水钠锰矿形成速率的影响。将采用微生物介导的和化学合成的反应系统。除了湿化学分析外,还将使用X射线吸收光谱、衍射和原子对分布函数分析以及高分辨率透射电子显微镜来表征水钠锰矿样品。结果预计将推进目前的理解,同时产生新的知识锰氧化物矿物学和地球化学及其对地球化学循环的影响。

项目成果

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Mengqiang Zhu其他文献

High Co-doping promotes the transition of birnessite layer symmetry from orthogonal to hexagonal
高共掺杂促进水钠锰矿层对称性从正交向六方转变
  • DOI:
    10.1016/j.chemgeo.2015.05.015
  • 发表时间:
    2015-09
  • 期刊:
  • 影响因子:
    3.9
  • 作者:
    Xionghan Feng;Shengqi Chu;Mengqiang Zhu;Fan Liu
  • 通讯作者:
    Fan Liu
Incorporation of Pb(II) into hematite during ferrihydrite transformation
  • DOI:
    DOI: 10.1039/C9EN01355E
  • 发表时间:
  • 期刊:
  • 影响因子:
  • 作者:
    Yang Lu;Shiwen Hu;Zheng Liang;Mengqiang Zhu;Zimeng Wang;Xiaoming Wang;Yuzhen Liang;Zhi Dang;Zhenqing Shi
  • 通讯作者:
    Zhenqing Shi
Incorporation of Pb(II) into hematite during ferrihydrite transformation
水铁矿转化过程中 Pb(II) 并入赤铁矿
  • DOI:
    10.1039/c9en01355e
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Yang Lu;Shiwen Hu;Zheng Liang;Mengqiang Zhu;Zimeng Wang;Xiaoming Wang;Yuzhen Liang;Zhi Dang;Zhenqing Shi
  • 通讯作者:
    Zhenqing Shi
Mn(II)-induced phase transformation of Mn(IV) oxide in seawater
锰(II)诱导的海水中锰(IV)氧化物的相变
  • DOI:
    10.1016/j.gca.2025.01.014
  • 发表时间:
    2025-03-15
  • 期刊:
  • 影响因子:
    5.000
  • 作者:
    Peng Yang;Ke Wen;Kevin A. Beyer;Wenqian Xu;Mengqiang Zhu
  • 通讯作者:
    Mengqiang Zhu
Manganese oxidation states and availability in forest weathering profiles of contrasting climate
  • DOI:
    10.1016/j.gca.2024.10.006
  • 发表时间:
    2025-01-01
  • 期刊:
  • 影响因子:
  • 作者:
    Zhuojun Zhang;Peng Yang;Ke Wen;Hai-Ruo Mao;Zhiqi Zhao;Congqiang Liu;Qing Zhu;Mengqiang Zhu
  • 通讯作者:
    Mengqiang Zhu

Mengqiang Zhu的其他文献

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{{ truncateString('Mengqiang Zhu', 18)}}的其他基金

RAPID: Responses of Soil Organic Carbon Chemistry to Wildfires across a Rainfall Gradient
RAPID:土壤有机碳化学对降雨梯度范围内野火的响应
  • 批准号:
    2409879
  • 财政年份:
    2024
  • 资助金额:
    $ 27.37万
  • 项目类别:
    Standard Grant
Collaborative Research: Climate effects on Mn oxidation states in soils and Mn/SOM interactions
合作研究:气候对土壤中锰氧化态的影响以及锰/SOM 相互作用
  • 批准号:
    2411362
  • 财政年份:
    2023
  • 资助金额:
    $ 27.37万
  • 项目类别:
    Standard Grant
Collaborative Research: Climate effects on Mn oxidation states in soils and Mn/SOM interactions
合作研究:气候对土壤中锰氧化态的影响以及锰/SOM 相互作用
  • 批准号:
    2027284
  • 财政年份:
    2020
  • 资助金额:
    $ 27.37万
  • 项目类别:
    Standard Grant
CAREER:Mineralogical and Biogeochemical Control of Phosphorus Transformation during Soil Development
职业:土壤发育过程中磷转化的矿物学和生物地球化学控制
  • 批准号:
    1752903
  • 财政年份:
    2018
  • 资助金额:
    $ 27.37万
  • 项目类别:
    Continuing Grant

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