Enhanced adsorptive removal of indigo carmine dye by bismuth oxide doped MgO based adsorbents from aqueous solution: equilibrium, kinetic and computational studies

Novel doped MgO nanoadsorbents were effectively fabricated at various Bi 2 O 3 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, an...

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Bibliographic Details
Published in:RSC advances 2022-08, Vol.12 (38), p.24786-2483
Main Authors: Adam, Fatima A, Ghoniem, M. G, Diawara, Moussa, Rahali, Seyfeddine, Abdulkhair, Babiker Y, Elamin, M. R, Ben Aissa, Mohamed Ali, Seydou, Mahamadou
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Adsorptivity
Aqueous solutions
Bismuth oxides
Bismuth trioxide
Chemisorption
Chemistry
Doping
Dyes
Goodness of fit
Indigo
Magnesium oxide
Nanoparticles
Reaction kinetics
Substitution reactions
Wastewater
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Summary:Novel doped MgO nanoadsorbents were effectively fabricated at various Bi 2 O 3 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, Bi 2 O 3 doping concentration, and pH were optimized to enhance the adsorption capacity. Bi 2 O 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. 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 via a chemisorption process. The IC adsorption mechanism on the Bi 2 O 3 doped MgO nanosorbents occurred through the chemisorption process.
ISSN:2046-2069
2046-2069
DOI:10.1039/d2ra02636h