7 It is considered as a potent toxic to mammalian cells, irritant, recalcitrant in addition to a high coloring capacity for aqueous solutions. 6 It is utilized as dyeing material for many purposes including textile coloring, cosmetics, printing, biological staining, dermatological and antibacterial agent, and as an additive to poultry feed. Indigo carmine, acid blue, is an organic compound with a chemical name, 5,5′-indigodisulfonic acid sodium salt (C 16H 8N 2Na 2O 8S 2, 466.36 g mol −1), 5 with two sulphonated groups and four aromatic rings. ![]() 4 This is a contradicted objective between the industrial sector and the environmental concerns bearing in mind that even a concentration of 1.0 ppm of dyes in the water can heavily impact its characteristics. 3 Color sustainability is one of the most desired characteristics of different industrial products such as textiles, leather, and plastics, hence the coloring materials, mainly dyes, should be stable compounds and nondegradable. ![]() Dyes can be toxic and carcinogenic in addition to their coloring properties. 2 The global annual production of natural and industrial dyes is about one million tons mainly consumed in textile, plastics, food, and other industries as coloring materials. Nondegradable organic materials can disturb the food chain of the aquatic flora and fauna resulting in the death of fishes, algae, and other aquatic organisms leading to ecosystem collapse. Discharging of different organic pollutants such as pesticides, pharmaceuticals, oils, detergents, hydrocarbons, plastic, and dyes 1 can negatively impact the quality of air, soil, and natural water resources through illegal discharge of industrial and domestic effluents. Introduction Dyes and other organic pollutants have a tremendous effect on water resources and the total environment. The FTIR study established that IC molecules are successfully adsorbed onto the surface of MgOBi2 via a chemisorption process. 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. Bi 2O 3 doped MgO prepared at 5% (MgOBi2) is the best adsorbent with a maximum IC adsorption capacity of 126 mg g −1 at a solution pH equal to 7.00 and contact time of 74 min. Experimental parameters such as the initial dye concentration, contact time, Bi 2O 3 doping concentration, and pH were optimized to enhance the adsorption capacity. The removal of indigo carmine (IC) dyes from wastewater by doped MgO nanoparticles is investigated. TEM, SEM, EDX, BET, XRD, and FTIR were used to characterize the obtained nanostructures. 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. ![]() Novel doped MgO nanoadsorbents were effectively fabricated at various Bi 2O 3 doping concentrations (0, 2.5, 5 and 10%). ![]() E-mail: d Université de Paris, ITODYS, CNRS, UMR 7086, 15 Rue J-A de Baïf, 75013, Paris, France E-mail: b 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 c Department of Chemistry, College of Science and Arts, Qassim University, Ar Rass, Saudi Arabia. Mohamed Ali Ben Aissa* c and Mahamadou Seydou d a Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia. RSC Adv., 2022, 12, 24786-24803 Enhanced adsorptive removal of indigo carmine dye by bismuth oxide doped MgO based adsorbents from aqueous solution: equilibrium, kinetic and computational studies
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