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首页> 外文期刊>RSC Advances >Novel Al2O3/GO/halloysite nanotube composite for sequestration of anionic and cationic dyes
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Novel Al2O3/GO/halloysite nanotube composite for sequestration of anionic and cationic dyes

机译：用于螯合阴离子和阳离子染料的新型Al2O3 / GO /卤化物纳米管复合材料

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In this study, an Al _(2) O _(3) /graphene oxide/halloysite nanotube (Al _(2) O _(3) /GO/HNT) nanocomposite has been synthesized and used as an adsorbent for the sequestration of cationic methylene blue (MB) and anionic congo red (CR) dyes from wastewater. The properties of the synthesized Al _(2) O _(3) /GO/HNT were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Various factors such as pH, contact time, initial concentration and temperature have been investigated for evaluation of the optimum adsorption in the batch sorption experiment and experimental results showed the highest adsorption capacity was found to be 329.8 mg g ~(?1) for CR and 258.4 mg g ~(?1) for MB at an initial concentration of 500 mg l ~(?1) which was three times higher than the individual Al _(2) O _(3) GO and HNT concentrations. Freundlich and Langmuir adsorption isotherm models were fitted to the experimental data and the results implied that the adsorption of MB well described with Langmuir and CR is related to the Freundlich isotherm model. The kinetics data of CR and MB adsorption was well fitted to pseudo-first-order. The calculated values for thermodynamic parameters indicated that the MB and CR adsorption process were spontaneous and exothermic in nature. The effectiveness of the Al _(2) O _(3) /GO/HNT composite was also tested for adsorption of Cu( II ), oxytetracycline (OTC) antibiotic, and 2-chlorophenol (2CP) and the results revealed that the Al _(2) O _(3) /GO/HNT composite is a promising adsorbent for the dyes as well as heavy metals and other organic pollutants.
机译：在这项研究中，Al _（2）O _（3）/氧化石墨烯/卤化物纳米管（Al _（2）O _（3）/ GO / HNT）纳米复合材料已被合成并用作吸附螯合剂。废水中的阳离子亚甲基蓝（MB）和阴离子刚果红（CR）染料。通过X射线衍射（XRD），X射线光电子能谱（XPS），扫描电子显微镜（SEM）和透射电子显微镜（（X））对合成的Al _（2）O _（3）/ GO / HNT的性能进行了表征（ TEM）。在分批吸附实验中，研究了pH，接触时间，初始浓度和温度等各种因素，以评估最佳吸附效果，实验结果表明，对CR和CR的最高吸附容量为329.8 mg g〜（？1）。 MB的初始浓度为500 mg l〜（？1），为258.4 mg g〜（？1），这是单独的Al _（2）O _（3）GO和HNT浓度的三倍。实验数据拟合了Freundlich和Langmuir吸附等温线模型，结果表明Langmuir和CR很好地描述了MB的吸附与Freundlich等温线模型有关。 CR和MB吸附的动力学数据很好地拟合为伪一级。热力学参数的计算值表明，MB和CR的吸附过程是自然的，并且是放热的。还测试了Al _（2）O _（3）/ GO / HNT复合材料对Cu（II），土霉素（OTC）抗生素和2-氯苯酚（2CP）的吸附效果，结果表明Al _（2）O _（3）/ GO / HNT复合材料是一种有希望的染料，重金属和其他有机污染物的吸附剂。

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