Effects of biomass feedstocks on the activation of persulfate by magnetic biochar for the removal of norfloxacin

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-03-11 DOI:10.1016/j.colsurfa.2025.136501

Yun Zhang , Yunqiang Yi , Yue Fu , Qin Wang , Yu Wang , Yi Diao , Zenghui Diao , Zhenguo Chen

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Abstract

The activation of persulfate (PS) by magnetic biochar (MBC) is a promising approach for degrading organic pollutants in water. However, the influence of biomass feedstocks on the activation performance of MBC for PS remains underexplored. In this study, three types of MBC were synthesized from sugarcane bagasse (GMBC), rice straw (DMBC), and water hyacinth (SMBC) to evaluate their effectiveness in activating PS for norfloxacin (NOR) degradation. NOR degradation experiments showed variations in NOR removal efficiency among the different MBC/PS systems. Specifically, the DMBC/PS system achieved a NOR removal efficiency of 91.53 %, which was approximately 1.32 and 1.25 times higher than those of the GMBC/PS and SMBC/PS systems, respectively. Free radical scavenging experiments and electron paramagnetic resonance (EPR) analysis confirmed that the contribution of free radicals to NOR removal varied significantly among the MBC/PS systems, indicating that the types and behaviors of free radicals were influenced by the biomass feedstocks. The active sites responsible for PS activation were identified, elucidating the variability in the contribution of active sites among different MBC/PS systems. These findings suggested that biomass feedstocks indeed played a pivotal role in influencing the activation efficiency of MBC, offering valuable insights for optimizing advanced oxidation technology based on MBC.

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磁性生物炭（MBC）对过硫酸盐（PS）的活化是一种很有前景的降解水中有机污染物的方法。然而，生物质原料对磁性生物炭活化过硫酸盐性能的影响仍未得到充分探索。本研究以甘蔗渣（GMBC）、稻草（DMBC）和水葫芦（SMBC）为原料，合成了三种类型的 MBC，以评估它们活化 PS 降解诺氟沙星（NOR）的效果。诺氟沙星降解实验表明，不同的 MBC/PS 系统对诺氟沙星的去除效率存在差异。具体而言，DMBC/PS 系统的 NOR 去除率为 91.53%，分别是 GMBC/PS 和 SMBC/PS 系统的约 1.32 倍和 1.25 倍。自由基清除实验和电子顺磁共振（EPR）分析证实，在不同的 MBC/PS 系统中，自由基对 NOR 去除的贡献率存在显著差异，这表明自由基的类型和行为受到生物质原料的影响。确定了 PS 活化的活性位点，阐明了不同 MBC/PS 系统中活性位点贡献的差异性。这些发现表明，生物质原料在影响 MBC 的活化效率方面确实起着关键作用，为优化基于 MBC 的高级氧化技术提供了宝贵的见解。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.

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