Laboratory of Materials and Environment, Faculty of Sciences, Ibn Zohr University, Agadir, Morocco.
Laboratory of Materials and Environment, Faculty of Sciences, Ibn Zohr University, Agadir, Morocco.
Int J Biol Macromol. 2023 Jun 1;239:124373. doi: 10.1016/j.ijbiomac.2023.124373. Epub 2023 Apr 6.
In this study, quartz sand (QS) incorporated into a crosslinked chitosan-glutaraldehyde matrix (QS@Ch-Glu) was prepared and employed as an efficient adsorbent for the elimination of Orange G (OG) dye from water. The sorption process is adequately described by the pseudo-second order kinetic model and the Langmuir isotherm model with maximum adsorption capacities of 172.65, 188.18, and 206.65mg/g at 25, 35, and 45°C, respectively. A statistical physics model was adopted to elucidate the adsorption mechanism of OG on QS@Ch-Glu. Calculated thermodynamic factors revealed that the adsorption of OG is endothermic, spontaneous, and occurs via physical interactions. Overall, the proposed adsorption mechanism was based on electrostatic attractions, n-π stacking interaction, hydrogen bonding interaction, and Yoshida hydrogen bonding. The adsorption rate of QS@Ch-Glu was still above 95% even after 6 cycles of adsorption and desorption. Furthermore, QS@Ch-Glu demonstrated high efficiency in real water samples. All these findings demonstrate that QS@Ch-Glu is qualified for practical applications.
在这项研究中，制备了石英砂（QS）掺入交联壳聚糖-戊二醛基质（QS@Ch-Glu），并将其用作从水中去除橙 G（OG）染料的有效吸附剂。吸附过程通过伪二级动力学模型和 Langmuir 等温线模型得到了充分描述，在 25、35 和 45°C 下的最大吸附容量分别为 172.65、188.18 和 206.65mg/g。采用统计物理模型阐明了 OG 在 QS@Ch-Glu 上的吸附机理。计算得到的热力学参数表明，OG 的吸附是吸热的、自发的，并且通过物理相互作用发生。总的来说，OG 在 QS@Ch-Glu 上的吸附机理基于静电吸引、n-π 堆积相互作用、氢键相互作用和吉原氢键。即使经过 6 次吸附和解吸循环，QS@Ch-Glu 的吸附率仍保持在 95%以上。此外，QS@Ch-Glu 在实际水样中表现出高效性。所有这些发现表明，QS@Ch-Glu 可用于实际应用。
