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Organic azo dyes such as Methylene Blue (MB) pollute water and are considered a global threat to the health and environment. Accordingly, the present study aims to fabricate cost-effective, eco-friendly, and highly performing hybrid beads of Poly (Acrylonitrile-co-Styrene/Pyrrole)@Poly Vinyl Pyrrolidone (Poly (AN-co-ST/Py)@PVP) for Methylene Blue dye adsorption via the phase inversion technique. The fabricated hybrid beads were physico-chemically characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), and atomic force microscopy (AFM). The required experimental adsorption conditions were optimized: contact time, dye solution pH, beads dosage, and MB initial concentration. Langmuir isotherm and pseudo-second order kinetic models described the MB adsorption equilibrium and kinetics well. Only 0.8 g of the fabricated hybrid beads were needed to achieve a maximum of 90% dye removal after 180 min of equilibrium time. For screening, twenty-five runs were applied, and thirteen runs were optimized using the Plackett–Burman Design (PBD) model. Time is the most effective factor in PBD, with an efficiency rate of 88.42%, according to the optimization stage of the process after initial screening revealed that time, dosage, and dye concentration were the most important variables. The fabricated hybrid beads reveal a great ability to adsorb MB molecules effectively from wastewater samples. [ABSTRACT FROM AUTHOR]

Methylene blue azo dye (MB) immobilized onto Poly (glycidyl methacrylate-Co-methyl methacrylate), (PGMA-co-PMMA), and sulphonated Poly (glycidyl methacrylate-Co-methyl methacrylate), (SPGMA-co-PMMA), polymers composites have been developed as novel adsorbents for water treatment applications. The effect of copolymer composition and sulphonation on the MB content has been studied. Maximum MB content was correlated to the Polyglycidyl methacrylate content for both native and sulphonated copolymers. Furthermore, the effect of the adsorption conditions on the MB content was studied. Sulfonated Poly (glycidyl methacrylate; SPGMA) was the most efficient formed composite with the highest MB content. The developed composites' chemical structure and morphology were characterized using characterization tools such as particle size, FTIR, TGA, and SEM analyses. The developed MB-SPGMA composite adsorbent (27 mg/g), for the first time, was tested for the removal of Cr (VI) ions and Mn (VII) metal ions from dichromate and permanganate contaminated waters under mild adsorption conditions, opening a new field of multiuse of the same adsorbent in the removal of more than one contaminants. [ABSTRACT FROM AUTHOR]

The arsenic (As) pollution of water has been eliminated via intensive scientific efforts, with the purpose of giving safe drinking water to millions of people across the world. In this study, the adsorption of As(V) from a synthetic aqueous solution was verified using a Bentonite-Anthracite@Zetag (BT-An@Zetag) composite. The SEM, FT-IR, XRD, DSC, TGA, and SBET techniques were used to characterize the (BT-An@Zetag) composite. The adsorption of As(V) was explored using batch adsorption under varied operating scenarios. Five kinetic modelswere used to investigate kinetic data, whereas three isotherms had been used to fit empirical equilibrium data. According to the findings, the adsorption mechanism of As(V) was best described by the Freundlich isotherm with a maximum monolayer coverage of 38.6 mg/g showing pseudo-second-order mode. The estimated enthalpy (H°) indicates that the adsorption process is both chemical and endothermic.The calculated free energy (G°) indicates that the reaction is nonspontaneous. After four sequential adsorption cycles, the produced BT-An@Zetag composite demonstrated good reusability and a greater adsorption affinity for As(V) ions. Overall, the BT-An@Zetag composite is suited for removing arsenic from wastewater using adsorption as a cost-effective and efficient technique. [ABSTRACT FROM AUTHOR]