Ghoniem Monira Galal, Ali Fatima Adam Mohamed, Abdulkhair Babiker Yagoub, Elamin Mohamed Rahmt Allah, Alqahtani Arwa Mofareh, Rahali Seyfeddine, Ben Aissa Mohamed Ali
Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia.
Department of Chemistry, College of Science and Arts, Qassim University, Ar Rass, Saudi Arabia.
Nanomaterials (Basel). 2022 Mar 21;12(6):1023. doi: 10.3390/nano12061023.
The organic synthetic dyes employed in industries are carcinogenic and harmful. Dyes must be removed from wastewater to limit or eliminate their presence before dumping into the natural environment. The current study aims to investigate the use of MgO nanoparticles to eliminate basic fuchsine (BF), as a model cationic dye pollutant, from wastewater. The MgO nanorods were synthesized through a coprecipitation method. The obtained nanocomposite was characterized using various techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Brunauer-Emmett-Teller (BET), and FTIR spectroscopy. It was found that the variation of dye concentration and pH influenced the removal of BF by MgO. The adsorption capacity of 493.90 mg/g is achieved under optimum operating conditions (pH = 11, contact time = 236 min, and initial BF concentration = 200 ppm). Pseudo-second-order adsorption kinetics and Freundlich isotherm models best fitted BF sorption onto MgO nanorods. The BF sorption mechanism is associated with the electrostatic attractions and hydrogen bond between the O-H group of MgO and the NH groups of BF, as indicated by the pH, isotherms, and FTIR studies. The reusability study indicates that MgO was effectively used to eliminate BF in at least four continuous cycles. The investigation of MgO with different dyes suggests the high adsorption selectivity of BF, crystal violet (CV), and malachite green (MG) dyes compared with methyl orange (MO) dye. Overall, MgO nanorods can act as a potential and promising adsorbent for the efficient and rapid removal of cationic dyes (CV, MG, and BF) from wastewater.
工业中使用的有机合成染料具有致癌性且有害。在将废水排放到自然环境之前，必须去除其中的染料以限制或消除其存在。当前的研究旨在探讨使用氧化镁纳米颗粒从废水中去除作为模型阳离子染料污染物的碱性品红（BF）。通过共沉淀法合成了氧化镁纳米棒。使用各种技术对所得纳米复合材料进行了表征，如X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、布鲁诺尔-埃米特-泰勒（BET）和傅里叶变换红外光谱（FTIR）。研究发现，染料浓度和pH值的变化会影响氧化镁对碱性品红的去除效果。在最佳操作条件下（pH = 11，接触时间 = 236分钟，初始碱性品红浓度 = 200 ppm），吸附容量达到493.90 mg/g。伪二级吸附动力学和弗伦德利希等温线模型最适合碱性品红在氧化镁纳米棒上的吸附。pH值、等温线和FTIR研究表明，碱性品红的吸附机制与氧化镁的O-H基团和碱性品红的NH基团之间的静电吸引和氢键有关。可重复使用性研究表明，氧化镁至少可以在四个连续循环中有效地用于去除碱性品红。对氧化镁与不同染料的研究表明，与甲基橙（MO）染料相比，碱性品红、结晶紫（CV）和孔雀石绿（MG）染料具有较高的吸附选择性。总体而言，氧化镁纳米棒可作为一种潜在且有前景的吸附剂，用于高效快速地从废水中去除阳离子染料（CV、MG和BF）。
