Toward Carbon-Negative and Emission-Curbing Roads to Drive Environmental Health
Toward Carbon-Negative and Emission-Curbing Roads to Drive Environmental Health
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DOI：
10.1021/acssuschemeng.1c07356
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发表时间：
2022-01
影响因子：
8.4
通讯作者：
H. Ghasemi;H. Yazdani;A. Rajib;E. Fini
中科院分区：
文献类型：
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作者：
H. Ghasemi;H. Yazdani;A. Rajib;E. Fini
道路基础设施在其使用寿命期间暴露于太阳紫外线（UV）辐射。紫外线会产生自由基，扩散到沥青层深处，加速沥青复合材料的老化和降解。在这里，我们假设，生物衍生的分子，如胺和酰胺接枝的碳质颗粒可以作为自由基的清除剂，延缓沥青复合材料的老化。为了验证这一假设，我们使用实验室实验和分子动力学模拟来比较由木质生物质和藻类生物质制成的生物炭在延缓沥青复合材料老化方面的功效。我们进一步研究了潜在的分子机制，通过计算自由基通过无定形石墨膜的原始形式和胺和酰胺官能化形式的扩散程度，延迟老化。实验室结果表明，藻类生物炭在延缓衰老方面比木本生物炭有效得多。模拟结果证实了实验室的研究结果表明，即使在低浓度下，表面官能团，如胺和酰胺，大大提高了原始碳屏蔽下面的层对自由基，如过氧化氢（H2O2）的扩散的功效。在高浓度下（例如，10重量%）时，发现胺在降低H2O2的扩散速率方面比酰胺更有效。这表明碳质颗粒的清除效率可以通过适当的生物接枝来优化。在这项研究中，用于制造功能化碳质颗粒的藻类是从空气中捕获CO2的一种手段。因此，我们的研究结果有助于延长公路基础设施的可持续性，同时朝着碳负和减排道路发展，以促进环境健康。
Roadway infrastructures are exposed to solar ultraviolet (UV) radiation during their service life. UV rays generate free radicals that diffuse deep into bitumen layers, accelerating the aging and degradation of bituminous composites. Here, we hypothesize that carbonaceous particles grafted by bioderived molecules such as amines and amides can serve as scavengers of free radicals, delaying aging in bituminous composites. To test this hypothesis, we use laboratory experiments and molecular dynamics simulations to compare the efficacy of biochars made from woody biomass and algal biomass in delaying the aging of bituminous composites. We further examine the underlying molecular mechanisms that delay aging by computing the extent of diffusion of free radicals through an amorphous graphite film in the pristine form and in amine- and amide-functionalized forms. The laboratory results indicate that algal biochar is considerably more effective than woody biochar in delaying aging. The simulation results corroborate laboratory findings showing that even at low concentrations, surface functionals such as amines and amides considerably enhance the efficacy of pristine carbon in shielding the underlying layers against the diffusion of free radicals such as hydrogen peroxide (H2O2). At high concentrations (e.g., 10 wt %), amines were found to be more effective than amides in reducing the diffusion rate of H2O2. This indicates that the scavenging efficacy of carbonaceous particles can be optimized by proper biografting. The algae that were used to make functionalized carbonaceous particles in this study are a means to capture CO2from air. Therefore, our findings contribute to extending the sustainability of highway infrastructures while moving toward carbon-negative and emission-curbing roads to promote environmental health.