Abstract

A series of Titanium-doped mesoporous bioactive glass with different Si-Ca ratios (MBG-Ti-1– MBG-Ti-5) were prepared by the sol-gel method. These materials were used to adsorb Norfloxacin (NOR) pollutant from aqueous solution. The morphology, microstructure and chemical properties of MBG-Ti-3 were characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The N₂ adsorption-desorption isotherm and pore size distribution of MBG-Ti-3 were investigated by the Brunauer–Emmett–Teller (BET) method and Barret–Joyner–Halenda (BJH) method. The specific surface of MBG-Ti-3 was 126.68 m²/g and the pore size was about 15 nm. The effect of time, initial concentration, pH and temperature on the adsorption of NOR were investigated. The maximum adsorption efficiency was 68% at 30°C, pH 8.0. Moreover, adsorption of NOR onto MBG-Ti-3 could be well fitted with the pseudo-first-order model and the pseudo-second-order model. Furthermore, adsorption was spontaneous, exothermic process of reduced entropy by analyzing thermodynamic model. Through the analysis of adsorption model, plausible adsorption mechanism was proposed. MBG-Ti-3 exhibited better adsorption efficiency after recycle 3 times. Additionally, bioactive glass was eco-friendly attribute to biological suitability which could not cause secondly pollution for aquatic environment. As an environmentally friendly adsorbent, Titanium-doped mesoporous bioactive glass showed promising potential application in NOR antibiotics removal from aquatic environment.

中文翻译：

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钛掺杂介孔生物活性玻璃吸附诺氟沙星：动力学、等温线、热力学和可再生研究

摘要

采用溶胶-凝胶法制备了一系列不同Si-Ca比例的钛掺杂介孔生物活性玻璃（MBG-Ti-1-MBG-Ti-5）。这些材料用于吸附水溶液中的诺氟沙星（NOR）污染物。采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)和X射线光电子能谱对MBG-Ti-3的形貌、微观结构和化学性能进行表征（XPS）。采用Brunauer-Emmett-Teller (BET)法和Barret-Joyner-Halenda (BJH)法研究了MBG-Ti-3的N ₂吸附-脱附等温线和孔径分布。MBG-Ti-3的比表面积为126.68 m ² /g，孔径约为15 nm。研究了时间、初始浓度、pH和温度对NOR吸附的影响。在30°C、pH 8.0时最大吸附效率为68%。此外，NOR在MBG-Ti-3上的吸附可以很好地符合伪一阶模型和伪二阶模型。此外，通过热力学模型分析，吸附是自发的、熵减的放热过程。通过对吸附模型的分析，提出了合理的吸附机理。MBG-Ti-3循环3次后表现出更好的吸附效率。此外，生物活性玻璃具有生物适应性，具有环保特性，不会对水生环境造成二次污染。作为一种环境友好型吸附剂，掺钛介孔生物活性玻璃在去除水生环境中的 NOR 抗生素方面显示出良好的潜在应用前景。