To develop a highly efficient adsorbent to remediate and remove hexavalent chromium ions (Cr(VI)) from polluted water, cellulose acetate (CA) and chitosan (CS), along with metal oxides (titanium dioxide (TiO) and ferroferric oxide (FeO)), and a zirconium-based metal-organic framework (UiO-66) were used to fabricate the composite porous nanofiber membranes through electrospinning. The adsorption performance, influencing factors, adsorption kinetics and isotherms of composite nanofiber membranes were comprehensively investigated. The multi-layer membrane with interpenetrating nanofibers and surface functional groups enhanced the natural physical adsorption and provided potential chemical sites. The thermal stability was improved by introducing TiO and UiO-66. CA/CS/UiO-66 exhibited the highest adsorption capacity (118.81 mg g) and removal rate (60.76%), which were twice higher than those of the control. The correlation coefficients () of all the composite nanofibers regressed by the Langmuir model were significantly higher than those by the Freundlich model. The pseudo-first-order kinetic curve of CA/CS composite nanofibers showed the highest (0.973), demonstrating that the whole adsorption process involved a combination of strong physical adsorption and weak chemical adsorption by the amino groups of CS. However, the values of the pseudo-second-order kinetic model increased after incorporating TiO, FeO, and UiO-66 into the CA/CS composite nanofiber membranes since an enhanced chemical reaction with Cr (VI) occured during the adsorption

中文翻译：

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通过将生物质与金属氧化物和金属有机骨架相结合的电纺复合多孔纳米纤维有效修复 Cr(VI)

开发高效吸附剂来修复和去除污水中的六价铬离子 (Cr(VI))、醋酸纤维素 (CA) 和壳聚糖 (CS)，以及金属氧化物（二氧化钛 (TiO) 和四氧化三铁 (FeO)） ）和锆基金属有机骨架（UiO-66）通过静电纺丝法制备复合多孔纳米纤维膜。综合研究了复合纳米纤维膜的吸附性能、影响因素、吸附动力学和等温线。具有互穿纳米纤维和表面官能团的多层膜增强了自然物理吸附并提供了潜在的化学位点。通过引入TiO和UiO-66提高了热稳定性。 CA/CS/UiO-66表现出最高的吸附容量（118.81 mg·g）和去除率（60.76%），是对照的两倍。 Langmuir模型回归的所有复合纳米纤维的相关系数()均显着高于Freundlich模型。 CA/CS复合纳米纤维的准一级动力学曲线最高(0.973)，表明整个吸附过程是CS氨基的强物理吸附和弱化学吸附的结合。然而，将 TiO、FeO 和 UiO-66 纳入 CA/CS 复合纳米纤维膜后，由于吸附过程中与 Cr (VI) 的化学反应增强，准二级动力学模型的值有所增加