Althumayri Khalid, Guesmi Ahlem, El-Fattah Wesam Abd, Houas Ammar, Hamadi Naoufel Ben, Shahat Ahmed
Department of Chemistry, College of Science, Taibah University, Al-Madinah Al-Munawarah 30002, Saudi Arabia.
Chemistry Department, College of Science, IMSIU (Imam Mohammad Ibn Saud Islamic University), P.O. Box 5701, Riyadh 11432, Saudi Arabia.
ACS Omega. 2023 Feb 6;8(7):6762-6777. doi: 10.1021/acsomega.2c07377. eCollection 2023 Feb 21.
In the present study, a nanocomposite adsorbent based on mesoporous silica nanotubes (MSNTs) loaded with 3-aminopropyltriethoxysilane (3-APTES@MSNTs) was synthesized. The nanocomposite was employed as an effective adsorbent for the adsorption of tetracycline (TC) antibiotics from aqueous media. It has an 848.80 mg/g maximal TC adsorption capability. The structure and properties of 3-APTES@MSNT nanoadsorbent were detected by TEM, XRD, SEM, FTIR, and N adsorption-desorption isotherms. The later analysis suggested that the 3-APTES@MSNT nanoadsorbent has abundant surface functional groups, effective pore size distribution, a larger pore volume, and a relatively higher surface area. Furthermore, the influence of key adsorption parameters, including ambient temperature, ionic strength, initial TC concentration, contact time, initial pH, coexisting ions, and adsorbent dosage, had also been investigated. The 3-APTES@MSNT nanoadsorbent's ability to adsorb the TC molecules was found to be more compatible with Langmuir isothermal and pseudo-second-order kinetic models. Moreover, research on temperature profiles pointed to the process' endothermic character. In combination with the characterization findings, it was logically concluded that the 3-APTES@MSNT nanoadsorbent's primary adsorption processes involved interaction, electrostatic interaction, hydrogen bonding interaction, and the pore-fling effect. The synthesized 3-APTES@MSNT nanoadsorbent has an interestingly high recyclability of >84.6 percent up to the fifth cycle. The 3-APTES@MSNT nanoadsorbent, therefore, showed promise for TC removal and environmental cleanup.
在本研究中，合成了一种基于负载3-氨丙基三乙氧基硅烷的介孔二氧化硅纳米管（3-APTES@MSNTs）的纳米复合吸附剂。该纳米复合材料被用作从水介质中吸附四环素（TC）抗生素的有效吸附剂。它具有848.80 mg/g的最大TC吸附能力。通过透射电子显微镜（TEM）、X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和N吸附-脱附等温线对3-APTES@MSNT纳米吸附剂的结构和性能进行了检测。后续分析表明，3-APTES@MSNT纳米吸附剂具有丰富的表面官能团、有效的孔径分布、较大的孔体积和相对较高的比表面积。此外，还研究了关键吸附参数的影响，包括环境温度、离子强度、初始TC浓度、接触时间、初始pH值、共存离子和吸附剂用量。发现3-APTES@MSNT纳米吸附剂吸附TC分子的能力与朗缪尔等温线和准二级动力学模型更相符。此外，对温度曲线的研究表明该过程具有吸热特性。结合表征结果，合理推断出3-APTES@MSNT纳米吸附剂的主要吸附过程涉及相互作用、静电相互作用、氢键相互作用和孔填充效应。合成的3-APTES@MSNT纳米吸附剂具有高达第五个循环时>84.6%的有趣的高可回收性。因此，3-APTES@MSNT纳米吸附剂在去除TC和环境净化方面显示出前景。
