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Adsorption enhancement mechanisms of silica-titania nanocomposites for elemental mercury vapor removal

机译：二氧化硅-二氧化钛纳米复合材料吸附去除元素汞蒸气的吸附机理

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摘要

A novel nanocomposite that combines high-surface area silica with the photocatalytic properties of titania has been developed that allows for effective capture of elemental mercury vapor. The adsorption capability of the developed material has been found to improve after periods of photocatalytic oxidation. In this study, the mechanisms for adsorption enhancement were identified. BET nitrogen adsorption and mercury porosimetry were used to evaluate pore structure, and the results suggest that a decrease in contact angle was likely to be responsible for improved mercury capture over time. Contact angle measurements showed a significant change of more than 10degrees, indicating greater attraction to mercury for the used pellets due to deposited mercuric oxide. ICP and TGA analyses showed that mercury was captured as both elemental mercury (Hgdegrees) and mercuric oxide (Hgdegrees). In addition, it was shown that pellets used for nearly 500 h still showed greater than 90% removal efficiency and had an average capacity of 10 mg of Hg/g based on mass balance calculations, while some pellets had a capacity over 30 mg of Hg/g according to ICP and TGA analyses. Mercuric oxide doped pellets removed 100% of elemental mercury without pretreatment. The superior mercury removal efficiency combined with various advantages of the novel composite demonstrates its use as an effective alternative to conventional activated carbon injection technology.
机译：已经开发出一种结合了高表面积二氧化硅和二氧化钛的光催化性能的新型纳米复合材料，可以有效捕获元素汞蒸气。已发现经过光催化氧化一段时间后，显影材料的吸附能力会提高。在这项研究中，确定了吸附增强的机制。 BET氮吸附和汞孔隙率法用于评估孔结构，结果表明，接触角的减小很可能是随着时间推移汞捕获率提高的原因。接触角测量结果显示，变化超过10度，这表明由于沉积的氧化汞，所用颗粒对汞的吸引力更大。 ICP和TGA分析表明，汞被捕获为元素汞（汞度）和氧化汞（汞度）。此外，根据质量平衡计算显示，使用近500小时的颗粒仍显示出90％以上的去除效率，平均容量为10 mg Hg / g，而某些颗粒的容量超过30 mg Hg / g根据ICP和TGA分析。氧化汞掺杂的颗粒无需预处理即可去除100％的元素汞。优异的除汞效率与新型复合材料的各种优点相结合，证明了其可作为传统活性炭注入技术的有效替代品。

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