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Adsorption and thermal degradation of Atenolol using carbon materials: Towards an advanced and sustainable drinking water treatment
Journal of Water Process Engineering ( IF 7 ) Pub Date : 2022-07-13 , DOI: 10.1016/j.jwpe.2022.102987
Helena García-Rosero, Luis A. Romero-Cano, Angelica Aguilar-Aguilar, Esther Bailón-García, Ana P. Carvalho, Agustín F. Pérez-Cadenas, Francisco Carrasco-Marín

With the aim to present an alternative material that can be used in adsorption/degradation processes to remove pharmaceutical pollutants present in water, a biocarbon was designed from Melia Azedarach stones. Material has a high surface area (1230 m2 g−1) with mainly oxygenated groups; these properties give it exceptional characteristics for removing Atenolol. To show the versatility of the material, the adsorption of Atenolol in different water matrices was tested: Ultrapure water (0 mg L−1 CaCO3), solution model (200 mg L−1 CaCO3), and tap water from Lisbon city (80 mg L−1 CaCO3). The pseudo-second-order model can well describe the adsorption kinetics; kinetic constants obtained were: 75.70, 46.18, and 42.58 g mmol h−1, respectively. The adsorption isotherms are correctly described by the Langmuir model, obtaining maximum adsorption capacities of 1.83, 2.00, and 1.81 mmol g−1, respectively. Physisorption phenomena carry out the adsorption mechanism (E < 1 kJ mol−1) between the atenolol molecule, positively charged, and the material's surface, negatively charged, forming a monolayer onto the material's surface. Once the material was saturated, its regeneration was studied by employing thermal treatment at 450 °C. Results show a decrease in the surface area after treatment, resulting in a loss of adsorption capacity (30 %). This procedure makes it possible to achieve repeat cycles of adsorption-degradation until the adsorbent is completely exhausted. The results obtained show this new material as a promising adsorbent for wastewater treatment contaminated with pharmaceutical pollutants since it has higher adsorption capacities than those reported in the literature in different water matrices.



中文翻译:

使用碳材料吸附和热降解阿替洛尔:迈向先进和可持续的饮用水处理

为了提供一种可用于吸附/降解过程以去除水中存在的药物污染物的替代材料,我们从Melia Azedarach石头中设计了一种生物碳。材料具有高表面积(1230 m 2  g -1),主要具有氧化基团;这些特性使其具有去除阿替洛尔的特殊特性。为了显示材料的多功能性,测试了阿替洛尔在不同水基质中的吸附:超纯水(0 mg L -1 CaCO 3)、溶液模型(200 mg L -1 CaCO 3)和里斯本市的自来水( 80 mg L -1 CaCO 3)。准二级模型可以很好地描述吸附动力学;获得的动力学常数分别为:75.70、46.18 和 42.58 g mmol h -1。Langmuir 模型正确描述了吸附等温线,分别获得了 1.83、2.00 和 1.81 mmol g -1的最大吸附容量。物理吸附现象执行吸附机制(E < 1 kJ mol -1) 在带正电的阿替洛尔分子和带负电的材料表面之间,在材料表面形成单层。一旦材料饱和,通过在 450 °C 下进行热处理来研究其再生。结果显示处理后表面积减少,导致吸附容量损失 (30%)。该程序可以实现吸附降解的重复循环,直到吸附剂完全耗尽。所获得的结果表明,这种新材料作为一种很有前途的吸附剂,可用于处理被药物污染物污染的废水,因为它在不同水基质中的吸附能力高于文献中报道的吸附能力。

更新日期:2022-07-14
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