Regenerable urchin-like Fe 3 O 4 @PDA-Ag hollow microspheres as catalyst and adsorbent for enhanced removal of organic dyes

Cui, Kuixin; Yan, Bin; Xie, Yijun; Qian, Hui; Wang, Xiaogang; Huang, Qingxue; He, Yuehui; Jin, Shengming; Zeng, Hongbo

doi:10.1016/j.jhazmat.2018.02.011

Cited by 186 publications

(56 citation statements)

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“…In recent times, porous metal oxides have been recognized as excellent solid adsorbents for wastewater treatment owing to their high surface area and the presence of sufficient active surface sites [25][26][27][28] . Among various metal oxides, Fe 3 O 4 nanoparticles (NPs) are drawing considerable attention due to their unique properties such as excellent biocompatibility, low synthetic cost, ease of functionalization, and high magnetic susceptibility leading to easy magnetic recovery [29][30][31][32][33][34] . Owing to the negatively charged surface, bare Fe 3 O 4 NPs have been shown as dye absorbents in many reports [35][36][37] ; however, its applicability is limited due to low adsorption capacity and poor selectivity and recyclability.…”

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confidence: 99%

Selective and Recyclable Congo Red Dye Adsorption by Spherical Fe3O4 Nanoparticles Functionalized with 1,2,4,5-Benzenetetracarboxylic Acid

Chatterjee

Guha

Krishnan

et al. 2020

Sci Rep

120

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In this study, the new material Fe 3 o 4 @BTCA has been synthesized by immobilization of 1,2,4,5-Benzenetetracarboxylic acid (BTCA) on the surface of Fe 3 o 4 NPs, obtained by co-precipitation of FeCl 3 .6H 2 o and fecl 2 .4H 2 O in the basic conditions. Characterization by P-XRD, FE-SEM, and TEM confirm Fe 3 o 4 has a spherical crystalline structure with an average diameter of 15 nm, which after functionalization with BTCA, increases to 20 nm. Functionalization also enhances the surface area and surface charge of the material, confirmed by BET and zeta potential analyses, respectively. The dye adsorption capacity of Fe 3 o 4 @BTCA has been investigated for three common dyes; Congo red (C.R), Methylene blue (M.B), and Crystal violet (C.V). The adsorption studies show that the material rapidly and selectively adsorbs C.R dye with very high adsorption capacity (630 mg/g), which is attributed to strong H-bonding ability of BTCA with C.R dye as indicated by adsorption mechanism study. The material also shows excellent recyclability without any considerable loss of adsorption capacity. Adsorption isotherm and kinetic studies suggest that the adsorption occurs by the Langmuir adsorption model following pseudo-second-order adsorption kinetics.

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confidence: 99%

Selective and Recyclable Congo Red Dye Adsorption by Spherical Fe3O4 Nanoparticles Functionalized with 1,2,4,5-Benzenetetracarboxylic Acid

Chatterjee

Guha

Krishnan

et al. 2020

Sci Rep

120

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“…In comparison, Ag 0 ‐Fe 3 O 4 was almost unreactive (0.005 min −1 ). An even higher rate of 1.78 min −1 was measured with a unique magnetic catalyst with hollow Fe 3 O 4 microspheres (350 nm) of urchin‐like morphology . High catalytic activity could be maintained in recycling washing the catalyst with NaBH 4 solution, ethanol, and water after every run (entry 7).…”

Section: Removal Of Toxic Materialsmentioning

confidence: 99%

Polydopamine – its Prolific Use as Catalyst and Support Material

Molnár

2020

ChemCatChem

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Polydopamine is a mussel-inspired functional material with a unique ability to form surface coatings. It is a green, environmentally benign product available very easily for a multitude of varied applications. This review attempts to collect useful information with respect to polydopamine-based catalytic studies with the use of polydopamine and modified polydopamine preparations loaded with varied catalytically active species including metal ions and metal particles. Major sections are about the use of polydopamine as catalyst material, utilization of immobilized enzymes, removal of toxic materials, results in organic synthesis, and fuel cell applications. A few examples of chiral catalysis and results of recycling studies are also treated. Data collected and analyzed indicate the importance and high potential of polydopamine-based catalysts in sustainable chemistry. of subunits attacked by an immobilized cyclohexeneamine (5) was suggested to be the transition state of CÀ C bond formation.Edouard et al. prepared catalyst 0.29 % PDA/PU by depositing PDA onto polyurethane foam (PU, 180 � 20 mg, 8 cm 3 ) and used it for the reduction of methylene blue (MB) with NaBH 4 . [48] Activities decreased gradually with repeated uses from 100 % to 35 % in run 11 but partial reactivation was achieved upon keeping the sample at 67°C for 8 h (55 % dropping below 10 % in run 13). Exposure to air at room temperature for six days proved to be somewhat more beneficial (90 % conversion in run 14 decreasing to 48 % in run 18). In a recent study they fabricated two oxidized PDA/PU samples and then loaded them with NaBH 4 . [49] One made by the usual method (dopamine/Tris, rt, 12 h, in air; sample PDA O2 PU), whereas the other was made by treating PU in a mixture of dopamine, NaOAc, and NaIO 4 (pH 5, rt, 24 h). The sample was dried (67°C) and washed thoroughly with water (PDA NaIO4 PU). Both products were dipped into an aqueous solution of NaBH 4 (0.1 M, 10 min) to afford boron contents of 2.37 and 2.11 wt%. The catalysts tested in the degradation of MB showed high activities with efficiencies of 97 % and 98 %, respectively (NaBH 4 /MB molar ratio 40, 177 mg and 209 mg catalysts, 25 min). During five reuses, the pH of the reaction medium increased because of boron loss (0.78 wt% and 0.81 wt%). The activity of PDA NaIO4 PU decreased to 89 % in run five. However, dipping the used sample into a 0.1 M NaBH 4 solution restored the original efficiency of 98 %. This, however, was only a temporary remedy, since a low efficiency of 60 % was measured in run 10. PDA was suggested by the authors to act as a redox mediator to prevent the hydrolysis/oxidation of immobilized borohydride.This formula (5) should be moved up and placed before the paragraph starting with "Edouard et al…"The Zuo group used PDA particles (avg. diameter 240 nm) to induce the reduction of MB and rhodamine B (RhB) with NaBH 4 . [50] Quinone moieties of PDA were assumed to channel electrons from NaBH 4 to the dyes. Indeed, PDA oxidized with NaIO 4 exhibited increased degradatio...

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“…Influence of reaction conditions such as catalysis reaction time and initial dyes concentration on dye degradation efficiency was also investigated. The concentrations of dyes in the assay solutions were measured by the method reported by previous reports [31][32][33].…”

Section: Catalytic Activity Measurementsmentioning

confidence: 99%

A Fenton-Like Nanocatalyst Based on Easily Separated Magnetic Nanorings for Oxidation and Degradation of Dye Pollutant

Shi

et al. 2020

Materials

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In this study, uniform Fe3O4 magnetic nanorings (Fe3O4-MNRs) were prepared through a simple hydrothermal method. The morphology, magnetic properties, and structure of the product were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), vibrating sample magnetometer (VSM), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), respectively. The Fe3O4-MNRs were used as Fenton-like catalysts in the presence of hydrogen peroxide (H2O2) and showed excellent Fenton-catalytic activity for degradation of organic dyes such as Methylene blue (MB), Rhodamine B (RhB), and Bromophenol blue (BPB). Furthermore, the obtained Fe3O4-MNRs could be recycled after used for several times and still remained in a relative high activity and could rapidly be separated from the reaction medium using a magnet without considerable loss. All results reveal that Fe3O4-MNRs have potential for the treatment of dyes pollutants.

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Regenerable urchin-like Fe 3 O 4 @PDA-Ag hollow microspheres as catalyst and adsorbent for enhanced removal of organic dyes

Cited by 186 publications

References 61 publications

Selective and Recyclable Congo Red Dye Adsorption by Spherical Fe3O4 Nanoparticles Functionalized with 1,2,4,5-Benzenetetracarboxylic Acid

Selective and Recyclable Congo Red Dye Adsorption by Spherical Fe3O4 Nanoparticles Functionalized with 1,2,4,5-Benzenetetracarboxylic Acid

Polydopamine – its Prolific Use as Catalyst and Support Material

A Fenton-Like Nanocatalyst Based on Easily Separated Magnetic Nanorings for Oxidation and Degradation of Dye Pollutant

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