Adsorptive removal of chromium(VI) using spherical resorcinol-formaldehyde beads prepared by inverse suspension polymerization

Mulani, Khudbudin; Patil, Vishwanath R.; Chavan, Nayaku; Donde, Kamini

doi:10.1007/s10965-019-1705-9

Cited by 13 publications

(4 citation statements)

References 39 publications

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“…After the AAM-MSMPM adsorbed the Cd(II) ions, the binding energy of C=O exhibited a blueshift of 4.03 eV, indicating that C had an obvious electron-receiving tendency [ 31 ]. The binding energy of N 1 s had a redshift of 0.09 eV, meaning that N has a noticeable tendency to lose electrons or share lone pair electrons [ 32 ], possibly because the five electrons in the outer layer of the N atom bonded in pairs, and the rest of the lone pair electrons could not easily form complexes with Cd(II) ions. During the process, N and Cd(II) ions shared electrons, decreasing N’s electron density, and increasing binding energy.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Modified Mechanically Activated Cassava Starch Magnetic Porous Microspheres and Its Adsorption for Cd(II) Ions

et al. 2023

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The magnetic polymer microsphere is a promising adsorbent due to its high adsorption efficiency and good regeneration ability from wastewater. Cassava starch magnetic porous microspheres (AAM-MSMPMs) were synthesized by graft copolymerization in inverse emulsion. Mechanically activated cassava starch (MS) was used to graft skeletons, vinyl monomers [acrylic acid (AA) and acrylamide (AM)] as copolymerized unsaturated monomers, methyl methacrylate (MMA) as the dispersing agent, and polyethylene glycol/methanol (PEG2000/MeOH) as the porogen. It was found that the AAM-MSMPM adsorbent is superparamagnetic, the saturation magnetization is 14.9 emu·g–1, and it can be rapidly and directionally separated from Cd(II) ions in aqueous solution. The FTIR indicated that the carboxyl and hydroxyl groups were grafted into MS. The AAM-MSMPM had good speroidization and a uniform size. After the porogen was added, the particle size of the AAM-MSMPM decreased from 19.00 to 7.00 nm, and the specific surface area increased from 7.00 to 35.00 m2·g–1. The pore volume increased from 0.03 to 0.13 cm3·g–1. The AAM-MSMPM exhibited a large specific surface area and provided more adsorption active sites for Cd(II) ions. The maximum adsorption capacity of the AAM-MSMPM for Cd(II) ions was 210.68 mg·g–1, i.e., 81.02% higher than that without porogen. Additionally, the Cd(II) ion adsorption process on the AAM-MSMPM can be described by Langmuir isothermal and pseudo-second-order kinetic models. A chemical reaction dominated the Cd(II) ion adsorption process on the AAM-MSMPM, and chemisorption was the rate-controlling step during the Cd(II) ion adsorption process. The AAM-MSMPM still had excellent stability after five consecutive reuses.

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Section: Resultsmentioning

confidence: 99%

Characterization of Modified Mechanically Activated Cassava Starch Magnetic Porous Microspheres and Its Adsorption for Cd(II) Ions

et al. 2023

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“…However, these methods have their own disadvantages of high cost, generation of secondary pollutants, less adaptability toward water from a variety of sources, and sensitivity toward pH change, which make them restricted to some of the metal ions. Adsorption is a well-developed process and has an edge over these methods due to its simplicity, cost-effectiveness, and applicability to all types of metal ions. − There is a large amount of published research literature, where a variety of bioadsorbents (rice husk, chitosan/bentonite composites, , chitosan beads, alginate beads, groundnut shell, biomass gasifier waste materials, tea leaf biomass, and biochar), organic sorbents (α-FeOOH, iminodiacetic acid cation-exchange resin, resorcinol–formaldehyde beads, imidazole-functionalized adsorbents), organic polymers and composites (porous organic polymers, polyaniline-doped sulfuric acid, polypyrrole/monodisperse latex spheres, cellulose@PEI aerogel, NFe 3 O 4 starch-Glu-NFe 3 O 4 ED, and silica-based inorganic–organic hybrid materials), metal–organic frameworks (Cu(I)-MOF@Fe 3 O 4 , ZIF-67 MOF@-aminated chitosan beads), metal oxides (Fe/Mn binary oxides, Fe 3 O 4 nanoparticles hybridized with carbonaceous materials, ferric hydroxide/oxohydroxides), and core@shell particles (polypyrrole attapulgite core–shells, Fe@Fe 2 O 3 core–shell nanowires) have been employed for the adsorptive removal of Cr(VI) and various other heavy metal ions . To the best of our knowledge, intermetallic compounds are still untouched in this field despite their superior properties, such as high thermal and structural stability, hardness, corrosion, chemical resistance, etc.…”

Section: Introductionmentioning

confidence: 99%

Transition-Metal Antimonides as Highly Efficient and Reusable Adsorbents for Hexavalent Chromium Removal from Water

Gujjar,

Srivastava

et al. 2023

ACS EST Water

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Herein, two mesoporous intermetallic compounds, CoSb and NiSb, synthesized using a green and cost-effective coprecipitation method, are investigated as efficient adsorbents for Cr(VI) removal. The synthesized samples were subjected to comprehensive characterization through X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) isotherm, X-ray photoelectron spectroscopy (XPS), and ζ-potential analyses. Batch adsorption experiments were conducted to evaluate the efficacies of CoSb and NiSb nanoparticles in removing Cr(VI) ions, considering key parameters such as the initial Cr(VI) concentration (2–50 mg L–1), contact time (24 h), pH (1.7, 4.5, 8.5), adsorbent dosage (0.3–0.9 g L–1), and recyclability (5 cycles). The results revealed that Cr(VI) adsorption on CoSb followed a pseudo-second-order kinetic model, while NiSb displayed a pseudo-first-order kinetic model. The Langmuir isotherm model best described the equilibrium data, indicating maximum adsorption capacities of 33.3 mg g–1 for CoSb and 30 mg g–1 for NiSb. A plausible mechanism regarding the adsorptive removal of Cr(VI) onto CoSb and NiSb particle surfaces is proposed in the discussion. Overall, this study underscores the effectiveness of CoSb and NiSb as promising candidates for the efficient removal of toxic Cr(VI), opening avenues for the use of other intermetallic compounds in heavy metal removal and various water treatment applications.

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“…Photocatalysts are commonly considered as the most promising and frequently used feasible strategy, owing to its easy operation, eco-friendly, low cost, regeneration, and high performance when compared to other approaches [16,17]. Various photocatalyst for the removal of Cr (VI) have been investigated, including active carbon [18], metal oxide nanoparticles [19,20], synthesized polymer beads [21] and agriculture waste [22]. Among these, iron oxide (Fe 3 O 4 ) is one of the most widely studied due to its high efficiency, chemical stability, low cost, and availability [23,24].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Visible Light Photodegradation of Cr(VI) Using Electrospun MWCNTs-Fe3O4@PES Nanofibers

et al. 2021

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The development of highly efficient photocatalysis has been prepared by two different methods for the photodegradation of Cr(VI) from an aqueous solution under visible light. The electrospun polyethersulfone (PES)/iron oxide (Fe3O4) and multi-wall carbon nanotubes (MWCNTs) composite nanofibers have been prepared using the electrospinning technique. The prepared materials were characterized by SEM and XRD analysis. The result reveals the successful fabrication of the composite nanofiber with uniformly and smooth nanofibers. The effect of numerous parameters were explored to investigate the effects of pH value, contact time, concentration of Cr(VI), and reusability. The MWCNTs-Fe3O4@PES composite nanofibers exhibited excellent photodegradation of Cr(VI) at pH 2 in 80 min. The photocatalysis materials are highly stable without significant reduction of the photocatalytic efficiency of Cr(VI) after five cycles. Therefore, due to its easy separation and reuse without loss of photocatalytic efficiency, the photocatalysis membrane has tremendous potential for the removal of heavy metals from aqueous solutions.

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Adsorptive removal of chromium(VI) using spherical resorcinol-formaldehyde beads prepared by inverse suspension polymerization

Cited by 13 publications

References 39 publications

Characterization of Modified Mechanically Activated Cassava Starch Magnetic Porous Microspheres and Its Adsorption for Cd(II) Ions

Characterization of Modified Mechanically Activated Cassava Starch Magnetic Porous Microspheres and Its Adsorption for Cd(II) Ions

Transition-Metal Antimonides as Highly Efficient and Reusable Adsorbents for Hexavalent Chromium Removal from Water

Highly Efficient Visible Light Photodegradation of Cr(VI) Using Electrospun MWCNTs-Fe3O4@PES Nanofibers

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