磁铁矿负载生物炭强化截留老化微塑料的性能和机制研究

唐宇琛; 熊村; 罗长健; 邱宇平

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中国环境科学 ›› 2026, Vol. 46 ›› Issue (1) : 429-439.

新污染物

磁铁矿负载生物炭强化截留老化微塑料的性能和机制研究

唐宇琛, 熊村, 罗长健, 邱宇平

作者信息 +

Performance and mechanisms of enhanced retention of aged microplastics by magnetite-loaded biochar

ANG Yu-chen, XIONG Cun, LUO Chang-jian, QIU Yu-ping

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文章历史 +

摘要

本研究通过调控相同铁炭质量比,采用共沉淀法制备了四种铁(氢)氧化物负载型生物炭,对比了其对水体中老化微塑料的截留效率.研究发现,铁(氢)氧化物(水铁矿、针铁矿、赤铁矿和磁铁矿)负载强化了静电吸引作用,提升了生物炭截留微塑料的能力.其中,磁铁矿负载生物炭的吸附去除最优(>90%),最大吸附量为25.02mg/g,较原始生物炭提升5.53倍,这可能与其铁氧化物负载量最高(4.15wt%)有关.吸附过程遵循Langmuir单层吸附模型与准一级动力学规律.在不同离子强度、阳离子价态和pH值影响下,磁铁矿负载生物炭的截留率均大于95%,且在多床体积截留与实际水体测试中依然保持了90%以上的截留率.磁铁矿负载生物炭经碱洗再生循环后,截留能力依然维持稳定,表明其具有良好的重复利用性.

Abstract

To compare their capture efficiency, four types of iron (hydro)oxide-loaded biochar functionalized with ferrihydrite, goethite, hematite, or magnetite were synthesized via co-precipitation method at a consistent iron-to-biochar mass ratio. The modification significantly improved electrostatic attraction between the biochar and aged microplastics, thereby increasing retention capacity. Among these materials, magnetite-loaded biochar demonstrated the highest removal efficiency exceeding 90% and maximum adsorption capacity of 25.02mg/g, representing a 5.53-fold improvement over unmodified biochar. This superior performance is likely attributed to its highest iron oxide loading (4.15wt%). Adsorption data followed both the Langmuir monolayer model and pseudo-first order kinetics. Notably, magnetite-loaded biochar maintained over 95% retention under varying ionic strengths, cation valences, and pH conditions. It also preserved greater than 90% of microplastics in multi-bed volume tests and real-water samples. Moreover, after multiple alkaline washing regeneration cycles, the material remained stable adsorption performance, demonstrating its excellent reusability potential.

导出引用

唐宇琛, 熊村, 罗长健, 邱宇平. 磁铁矿负载生物炭强化截留老化微塑料的性能和机制研究[J]. 中国环境科学. 2026, 46(1): 429-439

ANG Yu-chen, XIONG Cun, LUO Chang-jian, QIU Yu-ping. Performance and mechanisms of enhanced retention of aged microplastics by magnetite-loaded biochar[J]. China Environmental Science. 2026, 46(1): 429-439

中图分类号： X703.1

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