The seasonally shed bark of London Plane tree is an ideal source for biochar due to its high lignin content. Microplastics derived from plastic wastes has become a hot topic due to its potential threats to ecosystems. The aim of this work is to convert the shed bark into efficient London Plane bark biochar (LBC) adsorbents and investigate its application in microplastics adsorption. The effects of pyrolysis temperature on LBC structure, surface properties and microplastic adsorption were investigated and the best adsorption performance of 60.05 mg/L was found at the 550 °C-pyrolyzed LBC. The wet sieve-weighing method was applied to assess the adsorption effect of LBC and verified with thermogravimetric analysis. The adsorption of polystyrene (PS) particles on LBC was in accordance with the Sips isothermal model and the second-order-kinetics model. The robustness of LBCs and the adsorption mechanism were investigated. With the analysis from pore size distribution, SEM images, FTIR and XPS spectra, physical trapping, surface complexation, hydrogen bonding and π-π interaction all play key roles in the adsorption of PS onto the LBC surface. This study not only provides a new approach for the removal of microplastics, but also offers a broad perspective on the treatment of biomass waste.

中文翻译：

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用伦敦刨花树皮生物炭去除水溶液中的聚苯乙烯微塑料：热解温度、性能和机制


伦敦梧桐树的季节性脱落的树皮因其木质素含量高而成为生物炭的理想来源。由于塑料废物对生态系统的潜在威胁，源自塑料废物的微塑料已成为热门话题。这项工作的目的是将棚皮转化为高效的伦敦平面树皮生物炭（LBC）吸附剂，并研究其在微塑料吸附中的应用。研究了热解温度对LBC结构、表面性质和微塑料吸附的影响，发现550 ℃热解LBC的最佳吸附性能为60.05mg/L。采用湿筛称重法评估LBC的吸附效果，并通过热重分析进行验证。聚苯乙烯（PS）颗粒在LBC上的吸附符合Sips等温模型和二级动力学模型。研究了 LBC 的稳健性和吸附机制。通过孔径分布、SEM图像、FTIR和XPS光谱、物理捕获、表面络合、氢键和π-π相互作用的分析，这些都在PS在LBC表面的吸附中发挥着关键作用。这项研究不仅为去除微塑料提供了一种新方法，也为生物质废物的处理提供了广阔的前景。