PVP modified rGO/CoFe2O4 magnetic adsorbents with a unique sandwich structure and superior adsorption performance for anionic and cationic dyes

Du, Rongxiao; Cao, Haopeng; Wang, Guohui; Dou, Kai; Tsidaeva, Natalia; Wang, Wei

doi:10.1016/j.seppur.2022.120484

Cited by 38 publications

(4 citation statements)

References 64 publications

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“…Concurrently, the sulfonyl bands of PVP-BiOBr@IC were located at 1019.91 cm –1 , which is a lower wavenumber than that of pure IC (1025.48 cm –1 ). These results infer bond formation between IC molecules and adsorbent surfaces …”

Section: Resultsmentioning

confidence: 72%

Preparation of PVP-BiOBr Adsorbent for Efficient Indigo Carmine Dye Removal Using Flow-Circulation Systems

Teerasong,

Saenghirun,

Sunthornchainukul

et al. 2024

ACS Omega

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This work presents an adsorptive removal of indigo carmine (IC) dye using a polyvinylpyrrolidone capped bismuth oxybromide (PVP-BiOBr) adsorbent. PVP-BiOBr was synthesized via a simple precipitation method. The morphology and surface chemical structure of the adsorbent were characterized using XRD, SEM, FTIR, and BET analyses. The adsorption isotherm and kinetics were investigated to reveal the mechanism of dye removal. Prepared PVP-BiOBr has a crystallite size of 19.7 nm, with a mean particle size of ∼2 μm and a surface area of 5.14 m 2 g −1 . The optimum pH for this adsorptive process spanned the range of 4 to 9. Experimental data indicated applicability of the Langmuir isotherm model, and the study confirms a pseudo-second-order kinetics model. The maximum adsorption capacity for IC dye was 208.3 mg g −1 . A flow-circulation system was developed for the treatment of IC dye contaminated water samples. PVP-BiOBr was packed inside a column and did not spill into the water sample after treatment. The removal efficiency was ≥90% after 25 min. The PVP-BiOBr adsorbent could be reused for three cycles. This work demonstrates that PVP-BiOBr is a promising candidate as an adsorbent for IC dye removal. Additionally, the flow-based system establishes an automated operation in continuous mode, which is viable for large scale applications.

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Section: Resultsmentioning

confidence: 72%

Preparation of PVP-BiOBr Adsorbent for Efficient Indigo Carmine Dye Removal Using Flow-Circulation Systems

Teerasong,

Saenghirun,

Sunthornchainukul

et al. 2024

ACS Omega

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“…The anionic surface of the GO nanocomposite exhibits ∼ 93% efficiency of adsorption. 31 34 In this paper, Figure S4 shows the adsorption behavior of rGO, cobalt ferrite, and rGO/CoFe 2 O 4 (RGCF) nanocomposites. The adsorption efficiency trend was found to be RGCF > rGO > CoFe 2 O 4 NPs.…”

Section: Introductionmentioning

confidence: 99%

“…Their result data show that cobalt iron oxide modified by humic acid (CoFe 2 O 4 -HA) has greater adsorption rate . Du et al presented a study on the superior adsorption performance of anionic and cationic dyes by the PVP-modified rGO/CoFe 2 O 4 nanocomposite …”

Section: Introductionmentioning

confidence: 99%

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Reduced Graphene Oxide-Modified Spinel Cobalt Ferrite Nanocomposite: Synthesis, Characterization, and Its Superior Adsorption Performance for Dyes and Heavy Metals

Tanweer

Alam

2023

ACS Omega

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This work is dedicated to the synthesis, characterization, and adsorption performance of reduced graphene oxide-modified spinel cobalt ferrite nanoparticles. The as-synthesized reduced graphene oxide cobalt ferrite (RGCF) nanocomposite has been characterized using FTIR spectroscopy, FESEM coupled with EDXS, XRD, HRTEM, zeta potential, and vibrating sample magnetometer (VSM) measurements. FESEM proves the particle size in the range of 10 nm. FESEM, EDX, TEM, FTIR, and XPS analyses provide the proof of successful incorporation of rGO sheets with cobalt ferrite nanoparticles. The crystallinity and spinel phase of cobalt ferrite nanoparticles have been shown by XRD results. The saturation magnetization (M s ) was measured as 23.62 emu/g, proving the superparamagnetic behavior of RGCF. The adsorption abilities of the synthesized nanocomposite have been tested using cationic crystal violet (CV) and brilliant green (BG) and anionic methyl orange (MO) and Congo red (CR) dyes. The adsorption trend for MO, CR, BG, and As(V) follows RGCF > rGO > CF at neutral pH. Adsorption studies have been accomplished by optimizing parameters like pH (2−8), adsorbent dose (1−3 mg/25 mL), initial concentration (10−200 mg/L), and contact time at constant room temperature (RT). To further investigate the sorption behavior, isotherm, kinetics, and thermodynamic studies have been conducted. Langmuir isotherm and pseudo-secondorder kinetic models suited better for the adsorption of dyes and heavy metals. The maximum adsorption capacities (q m ) obtained have been found as 1666.7, 1000, 416.6, and 222.2 mg/g for MO, CR, BG, and As, respectively, with operational parameters such as T = 298.15 K; RGCF dose: 1 mg for MO and 1.5 mg each for CR, BG, and As. Thus, the RGCF nanocomposite was found to be an excellent adsorbent for the removal of dyes and heavy metals.

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CoFe2O4/ Mg0.9Ni0.1O Nanocomposites with Potential Application in Adsorption: Synthesis, Characterization and Malachite Green Removal

Sharrouf,

Aridi,

Habanjar

et al. 2024

Water Air Soil Pollut

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PVP modified rGO/CoFe2O4 magnetic adsorbents with a unique sandwich structure and superior adsorption performance for anionic and cationic dyes

Cited by 38 publications

References 64 publications

Preparation of PVP-BiOBr Adsorbent for Efficient Indigo Carmine Dye Removal Using Flow-Circulation Systems

Preparation of PVP-BiOBr Adsorbent for Efficient Indigo Carmine Dye Removal Using Flow-Circulation Systems

Reduced Graphene Oxide-Modified Spinel Cobalt Ferrite Nanocomposite: Synthesis, Characterization, and Its Superior Adsorption Performance for Dyes and Heavy Metals

CoFe2O4/ Mg0.9Ni0.1O Nanocomposites with Potential Application in Adsorption: Synthesis, Characterization and Malachite Green Removal

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