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The primary goal of this research is to compare the efficacy of raw freshwater snail shell (Viviparus Contectus) (FSS) and iron oxide coated calcined snail shell (IOCCSS) in removing As(V) ions from aqueous solution medium via adsorption. FTIR, XRD, EDX, BET surface area analysis and SEM image methods were used to characterise the structures of the obtained solid sorbents. The effects of solution's initial pH, initial As(V) concentration, contact time, adsorbent dose, and ambient temperature parameters on the removal of As(V) ions from aqueous solution medium with FSS and IOCCSS solid sorbents were analysed, and optimum conditions were determined. The maximum efficiency of As(V) ions adsorption was measured 94.27% at a pH value of 7.0, contact time of 60 min, initial ion concentration of 2.0 mg/L, the adsorbent dose of 2.0 g/L, and the ambient temperature of 50°C. Thermodynamic parameters ΔH, ΔG and ΔS were calculated for the removal of As(V) ions with IOCCSS solid sorbent, and the adsorption process was determined to be endothermic. The best fit was obtained by Langmuir isotherm model with maximum monolayer sorption capacity of 3.42 mg/g for arsenate. According to the obtained results, the low-cost IOCCSS solid sorbent has been proposed as a viable alternative material for the removal and preconcentration of As(V) from aqueous solutions. [ABSTRACT FROM AUTHOR]

Within the scope of this study, the removal of methylene blue (MB) dye from aqueous solution with SiNH2@FeNP nanocomposite, which was synthesised by green synthesis method using liquorice root (Glycyrrhiza Glabra) extract, was investigated by applying Box-Behnken experimental design method. With this newly synthesised material, solution pH value, adsorbent dosage and initial dye concentration parameters affecting the adsorption process in methylene blue removal from aqueous solutions were investigated. FTIR, SEM, BET and XRD techniques were applied to characterise the structure of the obtained SiNH2@FeNP nanocomposite. According to the data obtained from the experimental design results, in order to obtain approximately 87% methylene blue dye removal efficiency, pH, initial methylene blue concentration and adsorbent dosage values should be kept constant at 8.8, 35.8 and 3.38 g L−1, respectively. Meanwhile, to achieve an MB adsorption of 22 mg g−1, the initial adsorbent dose and pH should be kept at 0.5 g l−1 and 10, respectively. SiNH2@FeNP nanocomposite produced by the green synthesis method is an environmentally friendly and effective adsorbent. [ABSTRACT FROM AUTHOR]