Abstract

Due to the negative effects of emerging contaminants on the environment, that can potentially induce deleterious effects in aquatic and human life, this paper focuses on the removal from the water of Furosemide, through the adsorption process. Indeed, only a few papers are available in the literature about the Furosemide adsorption and, chitosan films are thus proposed for this purpose as safe, sustainable, and recyclable adsorbent materials. In the present work, the effects on the adsorption process of several experimental parameters such as the pH values, ionic strength, amount of adsorbent/pollutant, and temperature values were investigated. The kinetics models, isotherms of adsorption, and the thermodynamic parameters were studied showing that the Furosemide physisorption occurred on the heterogeneous Chitosan surface, endothermically (ΔH° = +31.27 ± 3.40 kJ mol⁻¹) and spontaneously (ΔS° = +150.00 ± 10.00 J mol⁻¹ K⁻¹), following a pseudo-second-order kinetic model. The 90% of the pollutant was adsorbed in 2 h, with a maximum adsorption capacity of 3.5 mg × g⁻¹. Despite these relatively low adsorption capacities, experiments of desorption were performed and 100% of adsorbed Furosemide was recovered by using concentrated NaCl solutions, proposing a low-cost and green approach, with respect to the previous literature relative to the Furosemide adsorption, fundamental for the pollutant recovery and adsorbent reuse.

摘要

由于新兴污染物对环境的负面影响，可能对水生生物和人类生活造成有害影响，因此本文着重探讨了通过吸附过程从呋塞米中去除水的方法。实际上，在文献中关于呋塞米吸附的文献很少，因此为此提出了壳聚糖薄膜作为安全，可持续和可回收的吸附材料。在目前的工作中，研究了几个实验参数如pH值，离子强度，吸附剂/污染物的量和温度值对吸附过程的影响。研究了动力学模型，吸附等温线和热力学参数，结果表明速尿的物理吸附发生在异质壳聚糖表面，吸热（ΔH + = 31.27±3.40 kJ mol ^-1）并自发地（ΔS °= +150.00±10.00 J mol ^-1 K ^-1），遵循伪二级动力学模型。90％的污染物在2小时内被吸附，最大吸附容量为3.5 mg×g ^-1。尽管这些吸附能力相对较低，但仍进行了解吸实验，并通过使用浓NaCl溶液回收了100％吸附的呋塞米，相对于先前有关呋塞米吸附的文献（相对于呋塞米的基本吸附方法）而言，该方法提出了一种低成本且绿色的方法。污染物回收和吸附剂再利用。