Chengcheng Yang, Li Liu, Zhaohui Liu, You Huang, Houxuan Pan, Da Yang, Longke Zhang
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引用次数: 0
Abstract
Nano-attapulgite (ATP) is a layered silicate mineral with abundant reserves, large specific surface area, and low cost. The unique structure of ATP has attracted wide attention in the field of adsorption. In this study, a preparation technology of ATP grafting basalt fiber (BF) was proposed by chemical grafting method based on the idea of plant root bionics. The optimal preparation process of ATP grafting BF was determined through the tests of asphalt absorption performance, thermal stability performance, and segregation dispersion performance. The mechanism of ATP grafting BF was analyzed by micro-morphology, functional group changes, and elemental composition. Finally, the adsorption performance of ATP grafting BF was investigated on the basis of adsorption kinetics model and molecular dynamics simulation. The study results indicated that ATP-BFHCl had better compatibility and wettability with asphalt. The quasi-second-order kinetic equation could better fit the adsorption process of ATP-BFHCl on asphaltene, which indicated that ATP-BFHCl adsorbed asphaltene with chemisorption or ion exchange. The diffusion coefficient and diffusion activation energy of the saturate and the aromatic were larger, indicating a smaller molecular weight and faster movement, and lightweight components of asphalt are more easily adsorbed on the surface of ATP. The diffusion activation energy of asphaltene is the smallest and the reaction is the easiest to take place, which indicates that it is the first to react during temperature increase. The research results can provide a theoretical basis and technical support for BF surface treatment technology.
纳米凹凸棒石（ATP）是一种层状硅酸盐矿物，具有储量丰富、比表面积大、成本低等特点。ATP 的独特结构在吸附领域引起了广泛关注。本研究基于植物根系仿生学的思想，通过化学接枝法提出了一种 ATP 接枝玄武岩纤维（BF）的制备技术。通过对沥青吸附性能、热稳定性能和离析分散性能的测试，确定了 ATP 接枝玄武岩纤维的最佳制备工艺。通过微观形态、官能团变化和元素组成分析了 ATP 接枝 BF 的机理。最后，根据吸附动力学模型和分子动力学模拟研究了 ATP 接枝 BF 的吸附性能。研究结果表明，ATP-BFHCl 与沥青具有更好的相容性和润湿性。准二阶动力学方程能较好地拟合 ATP-BFHCl 对沥青质的吸附过程，表明 ATP-BFHCl 以化学吸附或离子交换的方式吸附沥青质。饱和组分和芳香组分的扩散系数和扩散活化能较大，说明分子量较小，移动速度较快，沥青中的轻质组分更容易吸附在 ATP 表面。沥青质的扩散活化能最小，反应最容易发生，说明其在升温过程中最先发生反应。该研究成果可为 BF 表面处理技术提供理论依据和技术支持。
期刊介绍：
Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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