Efficiences and Mechanisms of Arsenic (As) Uptake from Aqueous Solution by Vivianite

Vivianite 从水溶液中吸收砷 (As) 的效率和机制

• 批准号: NE/E007716/1
• 负责人: Karen Hudson-Edwards
• 金额: $ 6.43万
• 依托单位: Birkbeck, University of London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FE007716%2F1
• 关键词: Efficiences; Mechanisms; Arsenic; Uptake; Aqueous

The provision of sustainable water resources of appropriate quality for various uses is one of the greatest and most important challenges facing society now and in the future. Within this context, demands on potable water are increasing as the human population grows and becomes more developed at a time when climate is changing the availability of water resources, and the quality of these resources is being undermined by overuse in many areas. Added to these is the problem that the quality of many large resources of water is compromised by natural contamination. For example, many anoxic lake, river and groundwater systems that provide the only sources of water for tens of millions of people worldwide are contaminated with arsenic (As). Consumption of these waters can lead to As toxicosis in animals, and to melanosis, gangrene, cancer and, ultimately, death in humans. Such a situation is best illustrated in West Bengal and Bangladesh, where, according to the World Health Organisation, there is the worst case of mass poisoning in the world. Obviously such a situation must not be allowed to continue if it is at all possible to remediate the problem. To this end, minerals may offer a solution if they are capable of uptaking and stabilizing potentially toxic elements such as As. The mineral vivianite [Fe3(PO4)2.8H2O] forms and is stable in these anoxic environments (acid mine drainage sites, rivers, lakes, urban water bodies), and initial experimental work shows that it can take up As, but its capacity for, and mechanisms of, uptake are not well understood. Our project will determine the efficiencies and mechanisms of uptake of As by vivianite so that it may be developed as a remediation tool in anoxic, As-contaminated water systems, thus protecting humans and ecosystems. This aim will be fulfilled by determining (1) the efficiency of sorption of As3+ and As5+ on synthetic vivianite by batch experiments, and (2) the mechanism of uptake of As3+ and As5+ on synthetic vivianite by spectroscopy. The project falls directly under NERC's priority area 'sustainable economies - identifying and providing sustainable solutions to the challenges associated with energy, land use and hazard mitigation'. The results of this study will be used by the large number of scientists and engineers worldwide studying the mechanisms of, and solutions to, As contamination of anoxic water systems, and, hopefully, offer a solution to the worst natural disaster facing society. The study will form the basis for further studies on synthetic and natural vivianite, including the influence of kinetics and bacteria on vivianite formation and As uptake.

为各种用途提供适当质量的可持续水资源是当今社会和将来面临的最大，最重要的挑战之一。在这种情况下，随着人口的增长，对饮用水的需求正在增加，并且在气候改变水资源的可用性时变得越来越发达，并且在许多地区过度使用这些资源的质量正在破坏这些资源的质量。除此之外，还有一个问题，即许多大型水资源的质量受到自然污染的损害。例如，许多为全世界数千万人提供的唯一水源提供了唯一的水源湖泊，被砷（AS）污染。这些水域的消费可能导致动物的毒性症，黑色素，坏疽，癌症以及最终在人类中死亡。在西孟加拉邦和孟加拉国最好地说明了这种情况，根据世界卫生组织的说法，世界上最糟糕的情况是世界上的大规模中毒。显然，如果完全有可能解决问题，则不得允许这种情况继续下去。为此，如果矿物质能够吸收和稳定诸如等潜在有毒元素（例如），则可以提供解决方案。矿物含量[Fe3（PO4）2.8H2O]形成，在这些缺氧环境（酸性矿山排水地点，河流，湖泊，城市水体）中是稳定的，并且最初的实验工作表明，它可以占据其能力，但其能力和机制的吸收量尚未得到充分理解。我们的项目将确定Vivianite摄取AS的效率和机制，以便可以作为缺氧，AS污染的水系统作为一种补救工具开发，从而保护人类和生态系统。通过（1）通过批处理实验确定（1）AS3+和AS5+在合成中的AS3+和AS5+吸附的效率，以及（2）通过光谱通过SpectRroscoppoy对合成vivianite的吸收机理。该项目直接属于NERC优先领域的“可持续经济体” - 确定并为与能源，土地使用和缓解危害相关的挑战提供可持续的解决方案。这项研究的结果将被全球的大量科学家和工程师使用，研究了缺氧水系统的污染机制，并希望解决方案，并希望能为社会面临的最严重的自然灾害提供解决方案。这项研究将构成有关合成和天然素铁矿的进一步研究的基础，包括动力学和细菌对维维亚岩形成和摄取的影响。

项目成果

Efficiences of As uptake from aqueous solution by a natural vivianite material at 4ºC

• DOI: 10.1180/minmag.2008.072.1.429
• 发表时间: 2008-02
• 期刊: Mineralogical Magazine
• 影响因子: 2.7
• 作者: K. Hudson-Edwards;S. Houghton;K. Taylor