Mechanisms of Hg Adsorption from Mixed Pollutant Streams

混合污染物流中汞的吸附机制

• 批准号: 7394376
• 负责人: Robert H. HURT
• 金额: $ 26.14万
• 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/7394376
• 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汞管理领域最复杂和最重要的科学问题之一，它影响着广泛的修复技术。现在已知汞/碳相互作用高度依赖于气相和水相中的次要成分，并且最佳捕获需要针对特定​​废物流定制碳表面化学。我们的目标是逐个了解汞/碳异质化学，以指导混合废物应用中碳吸附剂的合成和应用。实现这一目标的具体目标是： a) 最近测量新型碳纳米材料上的汞蒸气吸附动力学/容量 在布朗大学使用分子工程技术合成。这些材料具有均匀的、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) 测量瞬时解吸行为和氧化态变化，以提供有关吸附汞的化学形态和结合能的信息。 c) 扩展（a）和（b）的测试矩阵，以包括在热修复废气中掺入常见次要组分的二元和三元混合物。 d) 在同一组新型表面工程碳纳米结构上进行水相汞吸附实验，作为 pH 值和氯化物浓度的函数。 e) 利用 (a-d) 的结果开发全面的 Hg/C 机制、新的吸附剂配方以及根据废物流成分知识系统地修改碳表面的指南。 f) 与 SBRP 合作伙伴合作开展涉及含汞混合废物流的罗德岛案例研究， 并利用（a-f）的结果来确定和证明涉及新吸附剂配方的有效捕获技术。