Green activation of tea-stalk biochar for sustainable suppression of asphalt fume emissions via multi-mechanism adsorption

IF 8.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI:10.1016/j.conbuildmat.2026.145897

Hao Duan , Sanpeng Mao , Quantao Liu , Zhenyu Zou , Shi Xu , Jianying Yu

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Abstract

To promote sustainable road construction and reduce harmful emissions during asphalt paving, a green bio-based adsorbent was developed by activating tea-stalk-derived biochar (TB) using phytic acid, a biodegradable plant-derived organophosphate. This activation introduced a multiple adsorption mechanism that integrates physical adsorption, chemical interactions, and catalytic transformation. The results show that phytic acid significantly increased the specific surface area and micropore volume of TB, facilitated the development of graphitic structures to enhance π–π interactions with aromatic hydrocarbons, and incorporated phosphorus-containing functional groups that enabled chemical bonding and catalytic conversion. At only 0.5% dosage, the activated biochar (PTB) achieved a 64.2% reduction in VOCs and a 93.1% for H₂S, both exceeding the higher dosage of 2% TB (58.6% and 85.4%, respectively). GC-MS results confirmed that, under the influence of multiple adsorption mechanisms, PTB exhibited higher suppression efficiency across all categories of asphalt fume components, particularly for highly hazardous compounds such as benzene derivatives, alkenes, thiophenes, and ketones. This biochar-based approach offers a sustainable pathway for reducing asphalt-related air pollution during road construction, thereby supporting cleaner transport infrastructure and contributing to improved urban air quality.

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茶秆生物炭的绿色活化多机理吸附可持续抑制沥青烟尘排放

为了促进可持续道路建设和减少沥青铺装过程中的有害排放，研究了一种绿色生物基吸附剂，该吸附剂是用植酸（一种可生物降解的植物来源的有机磷酸盐）激活茶茎衍生的生物炭（TB）。这种活化引入了一种集物理吸附、化学相互作用和催化转化为一体的多重吸附机制。结果表明，植酸显著增加了TB的比表面积和微孔体积，促进了石墨结构的发展，增强了与芳烃的π -π相互作用，并引入了含磷官能团，实现了化学键和催化转化。在0.5%的添加量下，活性生物炭（PTB）的挥发性有机化合物（VOCs）和硫化氢（H2S）分别减少了64.2%和93.1%，均超过了2%的添加量（分别为58.6%和85.4%）。GC-MS结果证实，在多种吸附机制的影响下，PTB对所有类别的沥青烟成分都表现出更高的抑制效率，特别是对苯衍生物、烯烃、噻吩和酮类等高度有害化合物。这种基于生物炭的方法为减少道路建设过程中与沥青相关的空气污染提供了可持续的途径，从而支持更清洁的交通基础设施，并有助于改善城市空气质量。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.