Comparative investigation of RSM and ANN for multi-response modeling and optimization studies of derived chitosan from Archachatina marginata shell

Isotherms, kinetic and thermodynamic studies of methylene blue adsorption on chitosan flakes derived from African giant snail shell

“…The physicochemical properties of the prepared chitosan flakes from A. marginata shell powder, which included moisture, ash, fiber and protein contents, average molecular weight and apparent viscosity, were reported in our recent work to be 5.5%, 0.25%, 2.70, (0.85  0.27%), 220 kDa and (85.20 cP at 20°C), respectively (Bello and Olafadehan, 2021). Other properties of the chitosan flakes obtained in this study are particle size =150 µm, bulk density = 0.9 g/cm 3 , pH = 7.3 and pHpzc = 7.8.…”

“…Other properties of the chitosan flakes obtained in this study are particle size =150 µm, bulk density = 0.9 g/cm 3 , pH = 7.3 and pHpzc = 7.8. Equally, the morphological features of the chitosan flakes were assessed using Scanning Electronic Morphology (SEM) at 10,000 and 11,000 magnifications in our investigation (Bello and Olafadehan, 2021). It was revealed in Bello and Olafadehan (2021) that the surfaces of the shell of A. marginata and the chitosan flakes possessed cavities, pores and rough surfaces, which are viable characteristics of a typical adsorbent such as chitosan flakes.…”

“…Equally, the morphological features of the chitosan flakes were assessed using Scanning Electronic Morphology (SEM) at 10,000 and 11,000 magnifications in our investigation (Bello and Olafadehan, 2021). It was revealed in Bello and Olafadehan (2021) that the surfaces of the shell of A. marginata and the chitosan flakes possessed cavities, pores and rough surfaces, which are viable characteristics of a typical adsorbent such as chitosan flakes. Also, the Electron Dispersive X-ray Spectroscopy (EDS) spectrum and the distribution of chemical elements in the grated A. marginata shell waste revealed that the precursor contained the highest weight % of calcium (53.35) and least weight % of iron (0.52) with weight % of oxygen, silica, sodium, magnesium, phosphorus and carbon being 3.20, 1.72, 2.24, 3.32, 13.10 and 2.45, respectively (Bello and Olafadehan, 2021).…”

“…The production of the biosorbent (chitosan) used in this study from the shell wastes of A. marginata (African giant snail) was performed by washing the shell, drying, pulverization and following the processes of demineralization, deproteinization, deacetylation and decolorization as detailed in the works of Amoo et al (2019), Olafadehan et al (2020;2021) and Bello and Olafadehan (2021).…”

“…The characterization of the resulting flakes of chitosan was extensively carried out and reported elsewhere (Bello and Olafadehan, 2021). In this study, the surface point of zero charge of the prepared chitosan flakes from A. marginata shell was performed using the pH drift method as adopted by Banerjee and Chattopadhyaya (2013)…”