School of Sustainable Engineering and the Built Environment, Arizona State University, 660 S. College Avenue, Tempe, AZ, 85287-3005, USA.
School of Molecular Sciences, Arizona State University, 551 E University Dr. Tempe, AZ, 85287, USA.
Environ Pollut. 2022 Nov 15;313:120142. doi: 10.1016/j.envpol.2022.120142. Epub 2022 Sep 8.
Asphalt-surfaced areas such as roads have been reported as major non-combustion sources of reactive organic compounds in urban areas. Emission of latter compounds from asphalt is exacerbated due to exposure to sunlight and high temperature, contributing to negative human and environmental health outcomes. Furthermore, loss of asphalt components over time is linked to bitumen's aging that reduces service life of roads. Here, we introduce a designed bio-grafted-silica nano-filler derived from wood pellet as a sink for latter volatile compounds in an asphalt mixture. Molecular modeling calculations showed the remarkable adsorptive activity of the bio-grafted silica for trapping select asphalt volatiles, especially for the sulfur-containing aromatics and the oxygen-containing aromatics. Laboratory experiment revealed that the bitumen modified with bio-grafted silica exhibited up to 23% lower signs of aging. Thermogravimetric analysis proved that the modified bitumen exhibited a 16% reduction in mass loss compared to neat bitumen. Dynamic vapor sorption analysis also showed bio-grafted silica adsorbed higher amounts of a candidate volatile than pristine silica. The study outcomes highlights the advantages of a bio-derived modifier in asphalt to address concerns associated with the loss of hazardous compounds.
如道路等沥青铺面区域已被报告为城市地区中重要的非燃烧源反应性有机化合物。由于暴露在阳光和高温下，后者化合物从沥青中的排放加剧，导致对人类和环境健康的负面影响。此外，随着时间的推移，沥青成分的损失与沥青的老化有关，这会降低道路的使用寿命。在这里，我们介绍了一种源自木屑的设计生物接枝二氧化硅纳米填料，它可作为沥青混合物中后者挥发性化合物的吸收剂。分子建模计算表明，生物接枝二氧化硅对捕获选择的沥青挥发物具有显著的吸附活性，特别是对含硫芳烃和含氧芳烃。实验室实验表明，用生物接枝二氧化硅改性的沥青表现出高达 23%的老化迹象降低。热重分析证明，与纯沥青相比，改性沥青的质量损失减少了 16%。动态蒸汽吸附分析还表明，生物接枝二氧化硅吸附的候选挥发性物质比原始二氧化硅多。该研究结果突出了生物衍生改性剂在沥青中的优势，可解决与危险化合物损失相关的问题。
