Mn(II) removal from aqueous solutions by Co/Mo layered double hydroxide: Kinetics and thermodynamics

Bakr, A.A.; Mostafa, Mohsen S.; Sultan, E.A.

doi:10.1016/j.ejpe.2015.04.002

Cited by 30 publications

(8 citation statements)

References 36 publications

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“…The acidity of the metal-ion solution increases with time because of H + release during ion exchange between the (−SO 3 H)/ (−SO 3 H and −COOH) groups of adsorbents and the metal ions. 41 The increase in the acidity of the solution during Cd (II) removal by AAm-AMPS|MMT is slightly higher than that observed in removal by AMPS|MMT and significantly higher than that observed in removal by MMT. This increased acidity of the solution can be attributed to the increased probability of occurrence of ion change due to the presence of additional functional groups in the first structure than the latter two.…”

Section: Effect Of Initial Solution Ph On CD (Ii) Adsorptionmentioning

confidence: 79%

Synthesis and Characterization of Polymerized Acrylamide Coupled with Acrylamido-2-Methyl-1-Propane Sulfonic Acid-Montmorillonite Structure as a Novel Nanocomposite for Cd (II) Removal from Aqueous Solutions

et al. 2020

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This study introduces a novel hydrogel nanocomposite as a superabsorbent for the water decontamination of cadmium ions. The absorbent was prepared by the intercalation of polymerized acrylamide (AAm) and 2-acrylamido-2-methyl-1propane sulfonic acid (AMPS) in the presence of montmorillonite (MMT). The structural, morphological, and thermal properties of the synthesized hydrogel were determined by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The prepared organic structure was next tested in the removal of Cd (II) ions from an aqueous solution. Solution pH, retention time, metal-ion concentration, and absorbent dose were the tracked parameters during the removal of Cd ions. Successful elimination of cadmium ions from polluted water, by the absorbent, has been generally achieved under various operating conditions. The maximum Cd removal was observed under operating conditions of pH 5, absorbent dose 0.2 g/L, and time 105 min. The prepared hydrogel was able to absorb 301.5 mg of Cd (II) per each gram of its mass. The elevated absorption capacity of the presented hydrogel (AAm/AMPS/MMT) is explained by the presence of versatile functional groups within its structure and also by the network distributions onto its surface. Ion exchange between the absorbent and Cd (II) is another key factor for the observed absorption activity. The subsequent absorption/desorption cycles of the spent AAm-AMPS/MMT absorbent could show its high reliability in reusing with a display of consistent activity during the capture of Cd ions.

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Section: Effect Of Initial Solution Ph On CD (Ii) Adsorptionmentioning

confidence: 79%

Synthesis and Characterization of Polymerized Acrylamide Coupled with Acrylamido-2-Methyl-1-Propane Sulfonic Acid-Montmorillonite Structure as a Novel Nanocomposite for Cd (II) Removal from Aqueous Solutions

et al. 2020

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“…Commonly used adsorbents for Mn removal include activated carbon [46], zeolites [47], kaolinite clay [48], nanoparticles [49,50], polymers [51,52], and a wide range of natural and artificial solids [53,54]. The search for low-cost adsorbents is a major focus of current research efforts, and a variety of natural minerals [15,55], agricultural and industrial wastes [56], and bio-sorbents [57] have been tested.…”

Section: Adsorbentsmentioning

confidence: 99%

Removal of Manganese(II) from Acid Mine Wastewater: A Review of the Challenges and Opportunities with Special Emphasis on Mn-Oxidizing Bacteria and Microalgae

et al. 2019

Water

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Many global mining activities release large amounts of acidic mine drainage with high levels of manganese (Mn) having potentially detrimental effects on the environment. This review provides a comprehensive assessment of the main implications and challenges of Mn(II) removal from mine drainage. We first present the sources of contamination from mineral processing, as well as the adverse effects of Mn on mining ecosystems. Then the comparison of several techniques to remove Mn(II) from wastewater, as well as an assessment of the challenges associated with precipitation, adsorption, and oxidation/filtration are provided. We also critically analyze remediation options with special emphasis on Mn-oxidizing bacteria (MnOB) and microalgae. Recent literature demonstrates that MnOB can efficiently oxidize dissolved Mn(II) to Mn(III, IV) through enzymatic catalysis. Microalgae can also accelerate Mn(II) oxidation through indirect oxidation by increasing solution pH and dissolved oxygen production during its growth. Microbial oxidation and the removal of Mn(II) have been effective in treating artificial wastewater and groundwater under neutral conditions with adequate oxygen. Compared to physicochemical techniques, the bioremediation of manganese mine drainage without the addition of chemical reagents is relatively inexpensive. However, wastewater from manganese mines is acidic and has low-levels of dissolved oxygen, which inhibit the oxidizing ability of MnOB. We propose an alternative treatment for manganese mine drainage that focuses on the synergistic interactions of Mn in wastewater with co-immobilized MnOB/microalgae.

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“…To achieve these targets, the chemical reactions involve different types of catalytic materials; in order to save catalytic metal and cocatalysts, heterogeneous catalysis has retained an increasing attention from research community. Specific applications have been designed using supports as zeolite [1][2][3][4][5], tungstate/niobate [6], zirconia [7], silica [8,9], nickel [10], alumina [11], aluminosilicates [9,12,13], and layered double hydroxides (LDHs) [14,15]. Alumina is one of the most applied material for designing sorbents and catalysts because of its wide availability, high thermal stability, high mechanical strength, and large versatility (several phases and tailored structures can be produced for facing specific applications and requirements).…”

Section: Introductionmentioning

confidence: 99%

A new route for the synthesis of self-acidified and granulated mesoporous alumina catalyst with superior Lewis acidity and its application in cumene conversion

et al. 2019

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Self-acidified and granulated mesoporous alumina (SAGMA) with dendritic-like microscopic shape was prepared by a new route that involves: (a) direct dehydration of AlCl 3 (in the presence of capping petroleum wax), and (b) oxi-dation of intermediary AlCl 3 -nanorods. The AlCl 3 solution dispersed in petro-leum wax (capping media) was firstly dehydrated at 100 °C under inert atmosphere for manufacturing anhydrous AlCl 3 -nanorods (length: 50-100 nm; diameter: 5-10 nm). In a second step, this support was oxidized into c-alumina at 300 °C, under air atmosphere. In the course of the manufacturing process, released chlorine was deposited at the surface of the nanorods (more specifically during the oxidation step). The binding of chlorine (5.35%, w/w at the surface) onto c-alumina was demonstrated by both electron dispersive X-ray analysis (SEM-EDX) and Fourier-transformed infrared spectroscopy. Specific surface area reached 230 m 2 g -1 ; the average pore size was 7.8 nm. Material charac-terization was completed by measuring the surface acidity through both tem-perature-programmed desorption and pyridine desorption. The morphology and the phase structure were investigated using scanning electron microscopy and X-ray diffraction analysis, respectively. SAGMA (c-alumina) can be described as a strong Lewis (1.713 mmol g -1 ; i.e., about 93% of total acid sites) and Brønsted acid catalyst supported on a mesoporous structure (self-granular size of 177-250 lm). Cumene conversion (through a dealkylation pathway) was tested on SAGMA: maximum catalytic activity reached 87% at 300 °C. The conversion is highly selective: the reaction produces benzene and only traces of ethylbenzene (mass fraction below 4% compared to benzene). Apart from this good catalytic efficiency, the material is characterized by its strong stability in terms of both catalytic activity (loss less than 2%, for optimum conditions) and surface acidity (loss less than 3%), even for long reaction times (i.e., 24 h) under severe conditions (i.e., T 300 °C). This new material, easily manufactured, is characterized by high efficiency and selectivity in cumene conversion into benzene, associated with high acidity and good stability

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Mn(II) removal from aqueous solutions by Co/Mo layered double hydroxide: Kinetics and thermodynamics

Cited by 30 publications

References 36 publications

Synthesis and Characterization of Polymerized Acrylamide Coupled with Acrylamido-2-Methyl-1-Propane Sulfonic Acid-Montmorillonite Structure as a Novel Nanocomposite for Cd (II) Removal from Aqueous Solutions

Synthesis and Characterization of Polymerized Acrylamide Coupled with Acrylamido-2-Methyl-1-Propane Sulfonic Acid-Montmorillonite Structure as a Novel Nanocomposite for Cd (II) Removal from Aqueous Solutions

Removal of Manganese(II) from Acid Mine Wastewater: A Review of the Challenges and Opportunities with Special Emphasis on Mn-Oxidizing Bacteria and Microalgae

A new route for the synthesis of self-acidified and granulated mesoporous alumina catalyst with superior Lewis acidity and its application in cumene conversion

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