In this work, a novel porous biosorbent (HF-D) based on orange peel (OP) was prepared by an efficient and simple method. The prepared HF-D showed well-ordered dendrimerlike structures and remarkable adsorption performance for the removal of arsenic. Particularly, morphology and structure details proved that the dendrimerlike structure was formed by surrounding the crystal iron nanoparticles with amorphous carbon. Furthermore, the influence of various environmental factors (initial pH, coexisting inorganic ions, humic substances, etc.) on the adsorption of As(V) was investigated. An extraordinary As(V) adsorption capacity (81.3 mg/g) has been observed when the Fe/biomass ratio was 10 wt %. Adsorption and characterization data proved that the behavior of As(V) on HF-D was an adsorption–reduction process, including complex adsorption and inner reduction. In addition, the adsorption kinetics and isotherms were analyzed. The regeneration and application in groundwater solution of the prepared HF-D were discussed. This study not only provides an efficient biosorbent for removing arsenic but also a low cost and environmentally friendly method for synthesizing porous biomass based materials.

中文翻译：

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基于改性橙皮废料的新型树枝状大分子磁性生物吸附剂：砷的吸附还原行为

在这项工作中，通过一种有效而简单的方法制备了一种基于橙皮（OP）的新型多孔生物吸附剂（HF-D）。制备的HF-D表现出良好的树枝状结构，并具有显着的吸附性能，能够去除砷。特别地，形态学和结构细节证明，通过用无定形碳包围结晶铁纳米颗粒形成树状大分子结构。此外，研究了各种环境因素（初始pH，共存的无机离子，腐殖质等）对As（V）吸附的影响。当Fe /生物质比为10 wt％时，观察到了非凡的As（V）吸附容量（81.3 mg / g）。吸附和表征数据证明，As（V）在HF-D上的行为是吸附-还原过程，包括复杂的吸附和内部还原。另外，分析了吸附动力学和等温线。讨论了所制备的HF-D的再生及其在地下水中的应用。这项研究不仅为去除砷提供了一种有效的生物吸附剂，而且为合成基于多孔生物质的材料提供了一种低成本且环境友好的方法。