Department of Civil and Environmental Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran.
Research Laboratory of Spectroscopy & Micro and Nano Extraction, Department of Chemistry, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran.
Sci Rep. 2023 Jul 13;13(1):11341. doi: 10.1038/s41598-023-38511-0.
Sisal fiber is a potent economical biomaterial for designing composites because of its low density, high specific strength, no toxic effects, and renewability. The present study utilized sisal fiber as a starting material and subjected it to modification to produce a sisal fiber/polyaniline/bio-surfactant rhamnolipid-layered double hydroxide nanocomposite material denoted as SF@PANI@LDH@RL. The composite was evaluated for its efficacy in removing reactive orange 16 (RO16) and methylene blue (MB) from aqueous solutions. The synthesized adsorbent was characterized by FTIR, XRD, and SEM-EDS techniques; these analyses indicated the successful modification of the sisal fiber. The primary factors, including contact time, adsorbent dosage, dye concentration, temperature, and pH, were optimized for achieving the most excellent adsorption efficiency. On the one hand, methylene blue removal is enhanced in the basic solution (pH = 10). On the other hand, reactive orange 16 adsorption was favored in the acidic solution (pH = 3). The highest adsorption capacities for methylene blue and reactive orange 16 were 24.813 and 23.981 mg/g at 318 K, respectively. The Temkin isotherm model, which proves the adsorption procedure of methylene blue and reactive orange 16 could be regarded as a chemisorption procedure, supplies the most suitable explanation for the adsorption of methylene blue (R = 0.983) and reactive orange 16 (R = 0.996). Furthermore, Elovich is the best-fitting kinetic model for both dyes (R = 0.986 for MB and R = 0.987 for RO16). The recommended SF@PANI@LDH@RL adsorbent was reused six consecutive times and showed stable adsorption performance. The results demonstrate that SF@PANI@LDH@RL is a perfect adsorbent for eliminating cationic and anionic organic dyes from aqueous media.
剑麻纤维是一种经济实用的生物材料，具有低密度、高强度比、无毒副作用和可再生性等优点，非常适合用于复合材料的设计。本研究以剑麻纤维为原料，对其进行改性，制备了一种剑麻纤维/聚苯胺/生物表面活性剂鼠李糖脂层状双氢氧化物纳米复合材料，记为 SF@PANI@LDH@RL。该复合材料被评估用于从水溶液中去除活性艳橙 16（RO16）和亚甲基蓝（MB）的效果。采用傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）和扫描电子显微镜-能谱仪（SEM-EDS）对合成的吸附剂进行了表征，这些分析表明剑麻纤维的成功改性。通过优化接触时间、吸附剂用量、染料浓度、温度和 pH 值等主要因素，以达到最佳的吸附效率。一方面，在碱性溶液（pH=10）中，亚甲基蓝的去除效果得到增强。另一方面，在酸性溶液（pH=3）中，活性艳橙 16 的吸附效果更好。在 318 K 时，亚甲基蓝和活性艳橙 16 的最大吸附容量分别为 24.813 和 23.981 mg/g。Temkin 等温线模型证明了亚甲基蓝和活性艳橙 16 的吸附过程可以看作是化学吸附过程，为亚甲基蓝（R=0.983）和活性艳橙 16（R=0.996）的吸附提供了最合适的解释。此外，Elovich 是两种染料（MB 的 R=0.986 和 RO16 的 R=0.987）最拟合的动力学模型。推荐的 SF@PANI@LDH@RL 吸附剂重复使用六次后仍具有稳定的吸附性能。结果表明，SF@PANI@LDH@RL 是一种从水介质中去除阳离子和阴离子有机染料的理想吸附剂。
