Abstract

In this research, multiwalled carbon nanotubes (MWCNTs) were firstly oxidized with HNO₃/H₂SO₄ mixture and then functionalized with silane groups and were used for the removal of amoxicillin (AMX) as one of the most consumed antibiotics from the solution media. In addition, NH₄Cl-induced activated carbon (NAC) was also prepared as another adsorbent. Then the adsorption process was investigated by using silanized oxidized MWCNTs (S-F-MWCNTs). Physicochemical characterization of MWCNTs, F‑MWCNTs and S-F-MWCNTs was investigated by FTIR, FESEM, EDS, BET/BJH, TGA, and CA techniques. Also, NAC was characterized by FTIR technique. The effect of the operational variables such as pH, adsorbent dosage, contact time, sorbate concentration and temperature on the removal efficiency of the S‑F-MWCNTs adsorbent was studied in details by batch procedure. The results showed that maximum adsorption efficiency can be achieved under the optimized conditions of pH 7.0, adsorbate concentration = 70.0 mg/L, contact time = 45.0 min, S-F-MWCNTs adsorbent dosage = 0.020 g, and temperature = 25.0°C. Isothermic studies have showed that the Redlich–Peterson equation with a correlation coefficient of 0.995 and the lowest error rate has the highest correlation with the experimental data. The adsorption kinetics results show that AMX adsorption process was well-described by pseudo-second-order kinetic model. Thermodynamic parameters of the adsorption process were also calculated revealing that the adsorption of AMX onto S‑F‑MWCNTs and NAC is an exothermic and spontaneous process. Based on the experimental results, S‑F‑MWCNTs were regarded as an acceptable adsorbent for the removal of AMX from aqueous solutions. The AMX adsorption data under the optimum conditions via S-F-MWCNTs and NAC adsorbents revealed that the adsorption efficiency is desirable and satisfactory.

中文翻译：

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阿莫西林在硅烷化多壁碳纳米管上的吸附研究：等温线，动力学和热力学研究

摘要

在这项研究中，多壁碳纳米管（MWCNT）首先被HNO ₃ / H ₂ SO ₄混合物氧化，然后被硅烷基团官能化，并用于从溶液介质中去除作为消耗最多的抗生素之一的阿莫西林（AMX）。 。此外，NH ₄还制备了Cl诱导的活性炭（NAC）作为另一种吸附剂。然后使用硅烷化的氧化多壁碳纳米管（SF-MWCNT）研究了吸附过程。通过FTIR，FESEM，EDS，BET / BJH，TGA和CA技术研究了MWCNT，F-MWCNT和SF-MWCNT的理化特性。此外，NAC还通过FTIR技术进行了表征。通过分批方法详细研究了pH，吸附剂用量，接触时间，山梨酸盐浓度和温度等操作变量对S-F-MWCNTs吸附剂去除效率的影响。结果表明，在pH 7.0，吸附物浓度= 70.0 mg / L，接触时间= 45.0 min，SF-MWCNTs吸附剂量= 0.020 g，温度= 25.0°C的优化条件下，可以获得最大的吸附效率。等温研究表明，相关系数为0.995且错误率最低的Redlich-Peterson方程与实验数据具有最高的相关性。吸附动力学结果表明，AMX的吸附过程可以通过拟二阶动力学模型很好地描述。还计算了吸附过程的热力学参数，表明AMX在S‑F‑MWCNTs和NAC上的吸附是放热和自发的过程。根据实验结果，SF-MWCNT被视为从水溶液中去除AMX的可接受吸附剂。在最佳条件下，通过SF-MWCNTs和NAC吸附剂的AMX吸附数据表明，吸附效率是令人满意的。995，最低错误率与实验数据具有最高相关性。吸附动力学结果表明，用伪二级动力学模型可以很好地描述AMX的吸附过程。还计算了吸附过程的热力学参数，表明AMX在S‑F‑MWCNTs和NAC上的吸附是放热和自发的过程。根据实验结果，SF-MWCNT被视为从水溶液中去除AMX的可接受吸附剂。在最佳条件下，通过SF-MWCNTs和NAC吸附剂的AMX吸附数据表明，吸附效率是令人满意的。995，最低错误率与实验数据具有最高相关性。吸附动力学结果表明，用伪二级动力学模型可以很好地描述AMX的吸附过程。还计算了吸附过程的热力学参数，表明AMX在S‑F‑MWCNTs和NAC上的吸附是放热和自发过程。根据实验结果，SF-MWCNT被视为从水溶液中去除AMX的可接受吸附剂。在最佳条件下，通过SF-MWCNTs和NAC吸附剂的AMX吸附数据表明，吸附效率是令人满意的。还计算了吸附过程的热力学参数，表明AMX在S‑F‑MWCNTs和NAC上的吸附是放热和自发的过程。根据实验结果，SF-MWCNT被视为从水溶液中去除AMX的可接受吸附剂。在最佳条件下，通过SF-MWCNTs和NAC吸附剂的AMX吸附数据表明，吸附效率是令人满意的。还计算了吸附过程的热力学参数，表明AMX在S‑F‑MWCNTs和NAC上的吸附是放热和自发的过程。根据实验结果，SF-MWCNT被视为从水溶液中去除AMX的可接受吸附剂。在最佳条件下，通过SF-MWCNTs和NAC吸附剂的AMX吸附数据表明，吸附效率是令人满意的。