College of Chemistry, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou University, No. 100 of Kexue Road, Zhengzhou, 450001, People's Republic of China.
College of Chemistry, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou University, No. 100 of Kexue Road, Zhengzhou, 450001, People's Republic of China.
Chemosphere. 2020 Nov;259:127439. doi: 10.1016/j.chemosphere.2020.127439. Epub 2020 Jun 20.
The presence of emerging micropollutants and dyes in water resource has raised global concern about their intense effects to aquatic environments, ecosystem and human health in general. So far, various adsorbents have been suggested for reducing the levels of bisphenol A, methylene blue and neutral red contamination in wastewaters. However, a number of these adsorbents seemed to have low adsorptive capacities and regeneration performances. In view of these, batch experiment was performed to decontaminate these pollutants from aqueous solutions using an optimized bagasse-β-cyclodextrin polymer (SB-β-CD). Characterization studies of SB-β-CD were performed using FTIR, pH point of zero charge, XRD and BET methods. Adsorption of BPA, MB and NR was favored at lower temperature (298 K) and pH of 7.0, 9.0 and 6.0, respectively. The maximum adsorption capacity of BPA, MB and NR at 298 K was 121, 963 and 685 mg g, respectively. Hydrogen bonding through host-guest inclusion and electrostatic interactions could respectively attribute to uptake of BPA and MB/NR onto SB-β-CD. Adsorption kinetics of three pollutants followed pseudo-second-order model. Langmuir and Freundlich models were fitted to describe the adsorption of BPA and MB/NR, respectively. Thermodynamic parameters confirmed the occurrence of physical adsorption which is spontaneous and exothermic in nature. SB-β-CD loaded with BPA and MB/NR was certainly reused by 75% ethanol and 0.1 mol L HCl solutions, respectively. Novel SB-β-CD showed better adsorptive capacity and regeneration performances; consequently can offers practical application for removal of BPA, MB and NR from wastewaters.
水中新兴的微污染物和染料的存在引起了全球对其对水生环境、生态系统和人类健康的强烈影响的关注。到目前为止，已经提出了各种吸附剂来降低废水中双酚 A、亚甲蓝和中性红的污染水平。然而，许多这些吸附剂似乎具有低的吸附容量和再生性能。有鉴于此，使用优化的蔗渣-β-环糊精聚合物（SB-β-CD）进行了批实验，以从水溶液中去除这些污染物。使用 FTIR、pH 零电荷点、XRD 和 BET 方法对 SB-β-CD 进行了表征研究。BPA、MB 和 NR 的吸附在较低温度（298 K）和 pH 值为 7.0、9.0 和 6.0 时更有利。在 298 K 下，BPA、MB 和 NR 的最大吸附容量分别为 121、963 和 685 mg/g。通过主体-客体包合作用和静电相互作用形成氢键可以分别归因于 BPA 和 MB/NR 被 SB-β-CD 吸收。三种污染物的吸附动力学均遵循拟二级模型。Langmuir 和 Freundlich 模型分别拟合描述了 BPA 和 MB/NR 的吸附。热力学参数证实了物理吸附的发生，物理吸附本质上是自发和放热的。用 75%乙醇和 0.1 mol/L HCl 溶液分别对负载有 BPA 和 MB/NR 的 SB-β-CD 进行了再利用。新型 SB-β-CD 表现出更好的吸附容量和再生性能；因此，为从废水中去除 BPA、MB 和 NR 提供了实际应用。
