Adsorption of methylene blue on modified electrolytic manganese residue: Kinetics, isotherm, thermodynamics and mechanism analysis

Synthesis of Zeolite from Carbothermal Reduction Electrolytic Manganese Residue for the Removal of Macrolide Antibiotics from Aqueous Solution

“…This result may be because of the saturation of the active sites at the early stages of adsorption. Many vacant active sites of 6 h-synthesized zeolite EMANA are accessible, but as time increases, the adsorbent surface adsorption point is occupied, thus slowing down the adsorption process [33]. For further experiments, more than 400 min was set to be sufficient for macrolide antibiotics to achieve uptake equilibrium.…”

“…The second step can be ascribed to the intraparticle diffusion stage. None of the plot passed through the origin, indicating that the intraparticle diffusion was not the rate limiting step [33]. k i 1 was larger than k i 2 but still lower than 0.9, suggesting that film diffusion only acts minimally on the first step of the adsorption process, and is not the determinant of the entire process.…”

“…These outcomes can be explained by ROX containing two more methoxyl functional groups and ethoxylate than AZM, signifying that ROX has several adsorption sites for the hydroxyl group. Moreover, the peak of H–O–H deformation at 1648 cm −1 shifted to 1644 cm −1 after macrolide antibiotic adsorption, possibly attributed to the negatively charged surfaces of the adsorbent, wherein numerous –Si–O– existed and could provide adsorption sites for electrostatic interaction [33]. Furthermore, Chetan K. Chauhan demonstrated that the medium absorption band at 728 cm −1 indicates the wagging modes of vibration of the coordinated water and the metal–oxygen bond in the complex [44].…”

An organic–inorganic hybrid nanomaterial composed of a Dowson-type (NH4)6P2Mo18O62heteropolyanion and a metal–organic framework: synthesis, characterization, and application as an effective adsorbent for the removal of organic dyes

“…The goal is to discover an appropriate adsorption material which not only has the ability to reduce pollutant organic dyes with low loss and high efficiency, but also enables selective separation and recovery of raw materials. 15,16 Polyoxometalates (POMs) are an exceptional family of metal oxide clusters with manageable shapes and sizes, rich redox reactions, high electronegativity, oxo-enriched surfaces, rich topologies and photoactivity; they have been used in many exploration elds, including biochemistry, chemical analysis, sensors, catalysis, ion-selective membranes, magnetism and proton exchange membranes. 17 However, the submission of pure POMs as adsorbents or catalysts is imperfect because of their comparatively low surface areas (5-8 m 2 g À1 ), the according seriously obstructed accessibility to their active sites, and their high dissolvability in water, which creates difficulty in detaching them from the reaction mixture.…”

Electrokinetic Remediation of Electrolytic Manganese Residue Using Solar-Cell and Leachate-Recirculation

“…Titanium dioxide coating technology was used on the residue, which was solidified by cement to form a new photocatalytic self-cleaning material (Li et al, 2016), which combined waste incineration fly ash with electrolytic manganese residue under alkaline conditions to form a geopolymer system via a curing/stabilizing mechanism (Zhan et al, 2018). Under alkaline conditions, the electrolytic manganese residue was modified, and prepared into a synthetic zeolite by a melt reaction and hydrothermal treatment, to be used for adsorption of methylene blue or metal ions in wastewater (Li et al, 2015a(Li et al, , 2015bShu et al, 2018b). In addition, in all studies, the removing of the manganese ions and ammonium ions contained in the electrolytic manganese residue leachate was mainly by the carbonate and struvite precipitation method (Shu et al, 2019a(Shu et al, , 2019b, or the ammonium sulfite-electrochemical method (Shu et al, 2017b).…”