Dehdashti Bahare, Amin Mohammad Mehdi, Gholizadeh Abdolmajid, Miri Mohammad, Rafati Lida
1Student Research Committee, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
2Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
J Environ Health Sci Eng. 2019 Feb 6;17(1):281-293. doi: 10.1007/s40201-019-00347-0. eCollection 2019 Jun.
The removal of pharmaceutical pollutants from the aqueous environment is a great environmental concern, mainly due to their diversity, high consumption, and sustainability. In the current study, we aimed to investigate the ability of multi-walled carbon nanotubes (MWCNTs) modified by sodium hypochlorite (NaOCl) and ultrasonic treatment in refining wastewaters contaminated with Atenolol β-blocker drug (ATN). The physical and structural characteristics of the raw MWCNTs and modified MWCNTs (M-MWCNTs) were analyzed using SEM, TEM, Raman spectroscopy, TGA, and FT-IR techniques. The effects of different parameters, including pH, initial concentration, contact time, and temperature were studied and optimized. Subsequently, the adsorption data were analyzed by several kinetic and equilibrium isotherm equations and modeled by artificial neural network (ANN). Highest ATN removal (87.89%) ((q = 46.03 mg g)) occurred on the adsorbent activated within 10 s of ultrasonication time and NaOCl 30%. Moreover, adsorbent modification significantly improved the ATN removal, so that the removal rate on the raw MWCNTs was about 58%, but in the same conditions, M-MWCNTs removed more than 92% of the adsorbate. The adsorption process reached equilibrium after 90 min under the optimized pH of 6. According to ANN modeling, approximately the whole values dispersed around the 45°line, indicating a good compatibility between the trial results and ANN-predicted data. The modification of MWCNTs in proper ultrasonic power via appropriate concentration of NaOCl solution removed many of the impurities and significantly improved the adsorption performance of MWCNTs.
从水环境中去除药物污染物是一个重大的环境问题，主要是由于它们的多样性、高消耗量和可持续性。在本研究中，我们旨在研究经次氯酸钠（NaOCl）和超声处理改性的多壁碳纳米管（MWCNT）对含有阿替洛尔β受体阻滞剂药物（ATN）的废水进行净化的能力。使用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、拉曼光谱、热重分析（TGA）和傅里叶变换红外光谱（FT-IR）技术分析了原始MWCNT和改性MWCNT（M-MWCNT）的物理和结构特征。研究并优化了不同参数的影响，包括pH值、初始浓度、接触时间和温度。随后，通过几个动力学和平衡等温线方程分析吸附数据，并通过人工神经网络（ANN）进行建模。在超声处理时间为10秒且NaOCl浓度为30%的条件下活化的吸附剂上，ATN的去除率最高（87.89%）（q = 46.0 mg/g）。此外，吸附剂改性显著提高了ATN的去除率，使得原始MWCNT上的去除率约为58%，但在相同条件下，M-MWCNT去除了超过92%的吸附质。在优化的pH值为6的条件下，吸附过程在90分钟后达到平衡。根据ANN建模，几乎所有的值都分散在45°线周围，表明试验结果与ANN预测数据之间具有良好的兼容性。通过适当浓度的NaOCl溶液在适当的超声功率下对MWCNT进行改性，去除了许多杂质，并显著提高了MWCNT的吸附性能。
