改性纤维兼具良好的吸附能力和机械强度，在污染土治理方面具有广泛的应用前景。优选黄麻作为纤维材料，分别采用均苯四甲酸二酐、聚苯胺和双氧水进行改性，结合无侧限抗压强度、土体阳离子交换量（cationexchange capacity，CEC）、电导率（electricalconductivity，EC）、pH值等指标探究改性黄麻纤维协同水泥的固化效能，并借助醋酸缓冲溶液法分析其毒理性演变规律。结果表明，适宜的改性黄麻纤维协同水泥固化铅污染土可同步实现强度提升和毒性释放的控制，协同固化污染土较单一水泥固化污染土，无侧限抗压强度提高了76.78%，浸出毒性量降低了64.73%，且10次冻融循环作用下浸出毒性的波动缩小至1/3。黄麻纤维水解所生成碱性纤维素会引起水泥固化污染土pH的增大，羧基类酸性官能团的改性有助于借助中和作用进一步促进水化反应，增强水化硅酸钙（calciumsilicate hydrate，CSH）凝胶的生成。黄麻特别是改性纤维的引入对于EC和CEC的增益显著，纤维水泥协同固化作用下EC提高量可达单一水泥固化提高量的2.25倍，是增强吸附固化稳定性的关键。但由于纤维团聚、微粒间聚合及金属离子间静电斥力的影响，固化污染土强度和浸出毒性与纤维掺量及纤维长度并非呈正相关关系，3种改性方式中酸酐改性黄麻纤维吸附固化效果受纤维长度和掺量影响较小，且在强度和毒性控制指标方面均表现良好，统筹考虑工程应用和生态发展需求，纤维掺量0.9%+纤维长度18 mm的酸酐改性黄麻纤维适合用于协同水泥进行重金属污染土的固化处置。Themodified fibers exhibit excellent heavy metal adsorption capacity andmechanical strength

offering broad application potential in the remediation ofcontaminated soil. Jute was used as a fiber material

which was modified bypyromellitic dianhydride

polyaniline and hydrogen peroxide respectively. Thestudy examined the solidification efficiency of modified jute fiber inconjunction with cement

utilizing indicators such as unconfined compressivestrength

cation exchange capacity (CEC)

electrical conductivity (EC)

and pHvalue. Additionally

the toxicological evolution of this material was analyzedusing the acetic acid buffer solution method. The results indicate that theoptimal combination of modified jute fiber and cement co-solidificationeffectively enhances strength and mitigates toxicity release. The unconfinedcompressive strength of the co-solidified contaminated soil exceeds that ofcement-only solidification by 76.78%. Furthermore

the leaching toxicity andits fluctuation under 10 freeze-thaw cycles are reduced by 64.73% and to one-thirdof the original level. The hydrolysis of jute produces alkaline cellulose

which effectively elevates the pH of cement-solidified contaminated soil. Themodification of carboxyl acid functional groups promotes hydration reactionsvia neutralization

thereby enhancing the formation of calcium silicate hydrate(CSH). The introduction of jute

especially modified fibers

significantlyimproves the EC and CEC. Under the co-solidified function of fiber and cement

the increase of EC can reach 2.25 times that of cement-only solidification

which is the key to enhance the stability of adsorption. However

due to theinfluence of fiber agglomeration

particle polymerization

and electrostaticrepulsion between metal ions

the strength and leaching toxicity of solidifiedcontaminated soil are not positively correlated with fiber dosage and length.Among the three modification methods

the jute fiber modified with pyromelliticanhydride exhibits a robust adsorption and solidification effect

which isminimally influenced by fiber length and dosage. Furthermore

it demonstratessuperior performance in terms of strength and toxicity control indicators. Consideringboth engineering applications and ecological development requirements

pyromellitic dianhydride-modified jute fiber (with a dosage of 0.9% and a fiberlength of 18 mm) is more suitable for enhancing the effectiveness of cement intreating heavy metal-contaminated soil.