The study was focused on the preparation and characterizations of sodium periodate-modified nanocellulose (NaIO₄-NC) prepared from Eichhornia crassipes for the removal of cationic methylene blue (MB) dye from wastewater (WW). A chemical method was used for the preparation of NaIO₄-NC. The prepared NaIO₄-NC adsorbent was characterized by using X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscope (SEM), energy-dispersive X-ray (EDX), and Brunauer–Emmett–Teller (BET) instruments. Next, it was tested to the adsorption of MB dye from WW using batch experiments. The adsorption process was performed using Langmuir and Freundlich isotherm models with maximum adsorption efficiency (q_max) of 90.91 mg·g⁻¹ and percent color removal of 78.1% at optimum 30 mg·L⁻¹, 60 min., 1 g, and 8 values of initial concentration, contact time, adsorbent dose, and solution pH, respectively. Pseudo-second-order (PSO) kinetic model was well fitted for the adsorption of MB dye through the chemisorption process. The adsorption process was spontaneous and feasible from the thermodynamic study because the Gibbs free energy value was negative. After adsorption, the decreased values for physicochemical parameters of WW were observed in addition to the color removal. From the regeneration study, it is possible to conclude that NaIO₄-NC adsorbent was recyclable and reused as MB dye adsorption for 13 successive cycles without significant efficient loss.

中文翻译：

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使用高碘改性纳米纤维素去除废水中的亚甲蓝染料

该研究的重点是从凤眼莲制备的高碘酸钠改性纳米纤维素 (NaIO ₄ -NC)的制备和表征，用于去除废水 (WW) 中的阳离子亚甲蓝 (MB) 染料。化学方法用于制备NaIO ₄ -NC。制备的 NaIO ₄ -NC 吸附剂通过 X 射线衍射 (XRD)、傅里叶变换红外 (FTIR)、扫描电子显微镜 (SEM)、能量色散 X 射线 (EDX) 和 Brunauer-Emmett-Teller ( BET) 工具。接下来，使用批量实验测试了来自 WW 的 MB 染料的吸附。吸附过程使用 Langmuir 和 Freundlich 等温线模型进行，吸附效率最高 ( q_max ) 为 90.91 mg·g ^-1，在最佳 30 mg·L ^-1、60 分钟、1 g 和 8 个初始浓度、接触时间、吸附剂剂量和溶液 pH 值下，颜色去除百分比分别为 78.1% . 伪二级 (PSO) 动力学模型非常适合通过化学吸附过程吸附 MB 染料。由于吉布斯自由能值为负，吸附过程是自发的，并且从热力学研究来看是可行的。吸附后，除了颜色去除外，还观察到 WW 的理化参数值降低。从再生研究中，可以得出结论，NaIO ₄ -NC 吸附剂可回收并作为 MB 染料吸附重复使用 13 个连续循环，而没有显着的效率损失。