首页|金属掺杂氧化铈柱撑蒙脱土改性沥青的老化行为及催化性能

金属掺杂氧化铈柱撑蒙脱土改性沥青的老化行为及催化性能

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针对传统光催化材料在沥青路面中的应用催化降解效能低的问题,综合金属掺杂法和共沉淀法制备了3种金属(Cu、Fe、Mn)掺杂蒙脱土基氧化铈复合材料,探讨其物相成分演变规律、官能团变化特征及光吸收拓展范围,研究在梯度掺量条件下不同光催化复合材料改性沥青的流变性能、高温服役性能、抗老化能力及尾气降解效率.研究结果表明:引入过渡金属阳离子可降低复合材料的带隙,在实现CeO2在负载体上高分散效果的同时,也提高了新型光催化复合材料的光响应能力;当光催化复合材料掺量(质量分数)为4%时,改性沥青的高温流变性能、高温抗变形能力及抗老化性能衰减能力明显提升;当掺量为6%时,Fe3+掺杂CeO2柱撑蒙脱土改性沥青催化效果最佳,其中,对NO的降解效率可以达59.6%,降解效能提升17.3%.
Aging behavior and catalytic performance of asphalt modified by cerium oxide pillared montmorillonite
In view of the low catalytic degradation efficiency of traditional photocatalytic materials in asphalt pavement,three kinds of metal(Cu,Fe,Mn)doped cerium oxide composite materials were synthesized using a combination of metal doping and co-precipitation methods.The evolution of their phase composition,changes in functional groups and extension of light absorption range were investigated.The high dispersion effect of CeO2 on the negative support was achieved,and the photoresponse of the new photocatalytic composite was improved.The rheological properties,high-temperature performance,aging resistance,and exhaust gas degradation efficiency of asphalt modified with different photocatalytic composite materials under gradient doping conditions were studied.The results show that the introduction of transition metal cations can reduce the band gap of the composites.When the dosage of photocatalytic composite materials is 4%(mass fraction),the high-temperature rheological properties,resistance to high-temperature deformation and aging resistance of the modified asphalt are significantly improved.When the dosage is 6%,Fe3+-doped CeO2 supported on pillar-modified montmorillonite has the best catalytic effect,achieving a degradation efficiency of 59.6%for NO,and an increase of 17.3%in degradation efficiency.

photocatalysismetal dopingmodified asphaltaging performanceexhaust gas degradation

刘帅、金娇、刘培、曾湘、高玉超、陈柏臻

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长沙理工大学交通运输工程学院,湖南长沙,410114

公路养护技术国家工程研究中心,湖南长沙,410114

光催化 金属掺杂 改性沥青 老化性能 尾气降解

国家自然科学基金国家自然科学基金湖南省杰出青年科学基金德国优秀青年学者基金长沙市杰出创新青年人才项目广东省现代土木工程技术重点实验室开放基金湖南省研究生科研创新项目湖南省研究生科研创新项目

52174237517040402022JJ10051GZ1717kq22060312021B1212040003CX20230851QL20230205

2024

10.11817/j.issn.1672-7207.2024.03.025

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(3)
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