Mechanisms of Hg Adsorption from Mixed Pollutant Streams

混合污染物流中汞的吸附机制

• 批准号: 7599029
• 负责人: Robert H. HURT
• 金额: $ 27.15万
• 依托单位: BROWN UNIVERSITY
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/7599029
• 关键词: Adsorption; Area; Behavior; Binding; Carbon; Case Study; Chemicals; Chemistry; Chloride Ion; Chlorides; Complex; Condition; Development; Dose; Drug Formulations; Duct (organ) structure; Engineering; Environment; Gases; Goals; Guidelines; Injection of therapeutic agent; Investigation; Kinetics; Knowledge; Lead; Life; Maps; Marine Sediment; Measures; Mercury; Modification; Molecular; Nature; Neurologic; Phase; Process; Range; Recovery; Regulation; Rhode Island; Sampling; Site; Soil; Source; Stream; Surface; Suspension substance; Suspensions; Techniques; Technology; Testing; United States Environmental Protection Agency; Work; aqueous; base; human tissue; improved; mercury fumes; nanoforms; nanomaterials; oxidation; pollutant; prenatal; remediation; research study; vapor; wasting

The interactions of mercury with carbon sorbent surfaces is one of the most complex and important scientific questions in the area of Hg management, and it impacts a broad range of remediation technologies. Hg/C interactions are now known to be highly dependent on secondary components in both vapor and aqueous phases and optimal capture requires the tailoring of carbon surface chemistry for specific waste streams. Our goal is to understand Hg/C heterogeneous chemistry on a site-by-site basis to guide the synthesis and application of carbon sorbents for mixed waste applications. The specific Aims in pursuit of this goal are to: a) Measure mercury vapor adsorption kinetics/capacities on new carbon nanomaterials recently synthesized at Brown using molecular engineering techniques. These materials have uniform, orientationally ordered surfaces that allow a unique study of the separate contributions of graphene planes and edge sites. b) Measure transient desorption behavior and oxidation state changes to provide information on the chemical form and binding energies of adsorbed mercury. c) Extend the test matrix of (a) and (b) to include binary and ternary mixtures incorporating common secondary components in thermal remediation off-gases. d) Carry out aqueous phase Hg adsorption experiments as a function of pH and chloride concentration on the same set of new surface-engineered carbon nanoforms. e) Use the results from (a-d) to develop a comprehensive Hg/C mechanism, new sorbent fomulations, and guidelines for systematically modifying carbon surfaces from knowledge of waste streams composition. f) To work with SBRP partners on Rhode Island case studies involving Hg-containing mixed waste streams, and to use the results of (a-f) to identify and demonstrate effective capture technologies involving the new sorbents formulations.

汞与碳吸附剂表面的相互作用是HG管理领域中最复杂，最重要的科学问题之一，它影响了广泛的补救技术。现在已知Hg/c相互作用高度依赖于蒸气和水相中的二级成分，并且最佳捕获需要针对特定​​的废物流进行碳表面化学量身定制。我们的目标是逐个地点了解Hg/c异质化学，以指导碳吸附剂用于混合废物应用的合成和应用。追求这一目标的具体目的是： a）最近在新碳纳米材料上测量汞蒸气吸附动力学/能力 使用分子工程技术在棕色合成。这些材料具有统一的，定向有序的表面，可以对石墨烯平面和边缘位点的单独贡献进行独特的研究。 b）测量瞬态解吸行为和氧化状态变化，以提供有关吸附汞的化学形式和结合能的信息。 c）将（a）和（b）的测试矩阵扩展到包括二元和三元混合物中，将共同的二级成分掺入热补救置液中。 d）在相同的一组新的表面工程碳纳米型上，进行水相Hg吸附实验是pH和氯化物浓度的函数。 e）使用（A-D）的结果来开发全面的HG/C机制，新的吸烟性和系统从废物流组成的知识中系统地修改碳表面的指南。 f）与SBRP合作伙伴一起研究涉及含HG混合废物流的Rhode Island案例研究， 并使用（A-F）的结果来识别和证明涉及新吸附剂配方的有效捕获技术。