Adam Fatima A, Ghoniem M G, Diawara Moussa, Rahali Seyfeddine, Abdulkhair Babiker Y, Elamin M R, Ben Aissa Mohamed Ali, Seydou Mahamadou
Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU) Riyadh 11432 Saudi Arabia
Laboratoire de Centre de Calcul de Modélisation et de Simulation (CCMS), DER de Physique de La Faculté des Sciences et Techniques (FST), Université des Sciences des Techniques et des Technologies de Bamako (USTTB-Mali) Bamako Mali.
RSC Adv. 2022 Aug 31;12(38):24786-24803. doi: 10.1039/d2ra02636h. eCollection 2022 Aug 30.
Novel doped MgO nanoadsorbents were effectively fabricated at various BiO doping concentrations (0, 2.5, 5 and 10%). DFT-D3 study showed that the doping is done by substitution of two magnesium atoms by two bismuth atoms with the creation of a vacancy of one Mg atom. TEM, SEM, EDX, BET, XRD, and FTIR were used to characterize the obtained nanostructures. The removal of indigo carmine (IC) dyes from wastewater by doped MgO nanoparticles is investigated. Experimental parameters such as the initial dye concentration, contact time, BiO doping concentration, and pH were optimized to enhance the adsorption capacity. BiO doped MgO prepared at 5% (MgOBi2) is the best adsorbent with a maximum IC adsorption capacity of 126 mg g at a solution pH equal to 7.00 and contact time of 74 min. The results indicated that the adsorption process followed pseudo-second-order (PSO) reaction kinetics, and the Freundlich isotherm model gave a better goodness-of-fit than the linear Langmuir model. The FTIR study established that IC molecules are successfully adsorbed onto the surface of MgOBi2 a chemisorption process.
新型掺杂氧化镁纳米吸附剂是在不同的BiO掺杂浓度（0%、2.5%、5%和10%）下有效制备的。DFT-D3研究表明，掺杂是通过两个铋原子取代两个镁原子并产生一个镁原子空位来实现的。采用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、能谱仪（EDX）、比表面积分析仪（BET）、X射线衍射仪（XRD）和傅里叶变换红外光谱仪（FTIR）对所得纳米结构进行了表征。研究了掺杂氧化镁纳米颗粒对废水中靛蓝胭脂红（IC）染料的去除效果。对初始染料浓度、接触时间、BiO掺杂浓度和pH值等实验参数进行了优化，以提高吸附容量。在5%（MgOBi2）条件下制备的BiO掺杂氧化镁是最佳吸附剂，在溶液pH值为7.00、接触时间为74分钟时，对IC的最大吸附容量为126 mg/g。结果表明，吸附过程遵循准二级（PSO）反应动力学，与线性朗缪尔模型相比，弗伦德利希等温线模型的拟合优度更好。FTIR研究表明，IC分子成功吸附在MgOBi2表面，这是一个化学吸附过程。
