Magnetic hollow carbon microspheres as a reusable adsorbent for rhodamine B removal

Lu, Fu-Hsing; Huang, Chenguang; You, Lijun; Wang, Jiabing; Zhang, Qiqing

doi:10.1039/c7ra03045b

Cited by 18 publications

(13 citation statements)

References 41 publications

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“…Interestingly, a broad band with maxima at around 2θ of 23.9° was also observed, which could be assigned to the (002) plane of thin carbonaceous layers. 38,39 This suggests that a thin graphitic layer might be deposited on the Fe 3 O 4 nanoparticles. Raman spectroscopy is a potent tool to characterize a distinctive arrangement of crystal structures of carbon.…”

Section: Resultsmentioning

confidence: 99%

Counter Anion-Directed Growth of Iron Oxide Nanorods in a Polyol Medium with Efficient Peroxidase-Mimicking Activity for Degradation of Dyes in Contaminated Water

2019

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Development of nanozymes, which are nanomaterials with intrinsic enzymatic properties, has emerged as an appealing alternative to the natural enzymes with tremendous application potential from the chemical industry to biomedicine. The self-assembled growth of micrometer-sized oxide materials with controlled nonspherical shapes can be an important tool for enhancing activity as artificial enzymes, as the formation of these superstructures often results in high surface area with favorable impact on catalytic activity. Herein, the growth of rod-shaped Fe 3 O 4 microstructures via a one-pot microwave-based method and using a water–poly(ethylene glycol) mixture as a solvent is reported, without the involvement of external shape-directing agents. The precursor metal salt played a key role in the size, shape, and phase selective evolution of iron oxide micro/nanomaterials. Whereas self-assembled microrod superstructures were obtained using Fe(NO 3 ) 3 as the metal salt precursor, use of FeCl 3 or Fe-acetate as precursors afforded hollow Fe 2 O 3 microparticles and Fe 3 O 4 nanoparticles, respectively. A graphitic layer was deposited on the Fe 3 O 4 surface, imparting a negative surface charge as a result of a high-temperature treatment of poly(ethylene glycol). The rod-shaped Fe 3 O 4 microcrystals show efficient peroxidase-mimicking activity toward 3,3,5,5′-tetramethylbenzidine and pyrogallol as peroxidase substrates with a Michaelis–Menten rate constant ( K m ) value of 0.05 and 0.52 mM, respectively. The proficient enzyme mimicking behavior of these magnetic superstructures was further explored for the degradation of organic dyes that includes rhodamine B, methylene blue, and methyl orange with a rate constant ( k ) of 0.038, 0.011, and 0.007 min –1 respectively, using H 2 O 2 . This fast and simple method could help to develop a new pathway for differently shaped oxide nanoparticles in a sustainable and economical manner that can be harnessed as nanozymes for industrial as well as biological applications.

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Section: Resultsmentioning

confidence: 99%

Counter Anion-Directed Growth of Iron Oxide Nanorods in a Polyol Medium with Efficient Peroxidase-Mimicking Activity for Degradation of Dyes in Contaminated Water

2019

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“…Porous activated carbon materials have attracted high interest in the past, due to their remarkable physical and chemical properties, including chemical inertness, mechanical stability, electrical conductivity, and biocompatibility (Lu et al, 2017;Wang et al, 2018). Activated carbons are now used in a broad range of industrial applications, including the gas/air cleaning from pollutants, and catalysis (Benzigar et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…As far as the size and shape control of the carbon materials is concerned, many porous carbons have been successfully obtained through templating methods using hard templates (Benzigar et al, 2018), such as mesoporous silica, zeolites and polymer microspheres, or soft templates, such as copolymer surfactants (Lu et al, 2017). Polymer spheres not only can allocate other systems (metal oxides and other structures in the porous channels) (Cesano et al, 2012a;Wang et al, 2018), but the formation of 3D ordered macroporous materials is promoted (Sadakane et al, 2010(Sadakane et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

“…The template fabrication of core-shell magnetic mesoporous carbon microspheres in 3-Dimensional ordered macroporous silicas has been also reported (Wang et al, 2014). In general, the preparation processes from the templating approaches are usually difficult and cost/time-consuming, which limit their practical applications (Lu et al, 2017). Notwithstanding feasible strategies may be adopted starting from cheaper material, such as polymer precursors (Cesano et al, 2012b;Fenoglio et al, 2015;Xu et al, 2017), biomaterials (Azevedo et al, 2007;Hadidi et al, 2017), and wastes (Franzoso et al, 2017;Nisticò et al, 2018) and performing simple processes, such as chemical and thermal treatments (Molina-Sabio and Rodriguez-Reinoso, 2004;Zhang et al, 2010;Rosas et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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From Polymer to Magnetic Porous Carbon Spheres: Combined Microscopy, Spectroscopy, and Porosity Studies

et al. 2019

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The facile preparation of polymer waste-derived microporous carbon microspheres (S BET ∼800 m 2 /g) 100-300 µm in size, is reported at first. We have taken advantage of both, the crosslinked nature and the porous texture of the poly(4-ethylstyrene-co-divinylbenzene) microspheres, which allow the incoming anions and cations present in liquid media to enter and to remain segregated into the pores of the polymer microspheres as soon as the solvent is removed. Interestingly, the ZnCl 2 phase, when incorporated in the microporous molecular architecture of the polymer, prevents the collapsing of the pore structure of thermosetting polymer spheres during the pyrolysis occurring at 800 • C and acts as an activating agent of the carbon phase under formation, being responsible for the formation of an extended meso-and macroporosity (30-200 and 300-1,000 Å ranges). More interestingly, porous carbon microspheres with magnetic properties have been prepared from the ZnCl 2 -activated porous carbon spheres after impregnation with Fe nitrate solution and thermal treatment at 800 • C. A multi-technique methodology to characterize more extensively carbons at the micro/nanoscale is reported in the paper. More in detail, the morphology, structure, porous texture, and the surface properties of the carbon and of the magnetic carbon microspheres have been investigated by scanning and transmission electron microscopy, atomic force microscopy, X-ray diffraction, N 2 physisorption, diffuse reflectance UV-Vis, Raman and infrared spectroscopies. Furthermore, magnetic properties have been revealed at the nano-and at the macroscale by magnetic force microscopy and simple magnetically guided experiments by permanent magnets. The multi-technique methodology presented in the paper allows in elucidating more extensively about the different characteristics of activated carbons. Notwithstanding the huge amount of literature on activated carbons, the precise control of both the structure and the surface has, for the most part, hidden the relevance of other properties at the molecular scale of the assembled architectures. On the other hand, recent studies indicate that by molecular design, nanostructured, and porous carbonaceous materials could also be rationally proposed.

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“…Recently, multiple adsorbents have been used in the treatment of wastewater [14,15] such as grapheme oxide, zeolites, carbon tubes, clays, polypropylene, polystyrene, polyurethane [16][17][18]. Bearing in mind the further extending of the advanced adsorbents application in the industrial scale, recent research is dedicated to the synthesis of adsorbents that characterized by great sorption capacity as well as favorable reusability [19,20]. There is also other challenge concerning the treatment of dyeing wastewater which is while the anionic dyes removal has been recognized to be effective because of the positively charged surface of the sorbent occurred by protonation process [21,22], the dyeing discharge from textile industrial use is mostly in the pH range (9-11) [23].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of the anionic dye (Diamond Fast Brown KE) from textile wastewater onto chitosan/montmorillonite nanocomposites

et al. 2019

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A NOVEL nanocomposite chitosan/montmorillonite has been prepared by using two different weight ratios of nano-montmorillonite (Chs1 and Chs2). The structure of the prepared adsorbents has been characterized by Fourier transform infrared (FT-IR) spectroscopy, and transmission electron microscopy (TEM). The adsorption kinetics and isotherm behaviors of Diamond Fast Brown KE (DFB) dye molecules onto prepared chitosan nanocomposites had been studied and compared using pseudo-first, pseudo-second, and Langmuir, Freundlich, Dubinin _ Radushkevich models, respectively. The maximum adsorption capacities of DFB according to Langmuir isotherm model were 403.23 and 375.94 mg g-1 for Chs1 and Chs2, respectively. Moreover, our results indicate that the adsorption mechanism can be explained by the formation of the hydrogen bond. Based on the obtained results, Chs1 and Chs2 can be successfully applied for DFB dye removal from textile wastewater.

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Magnetic hollow carbon microspheres as a reusable adsorbent for rhodamine B removal

Abstract: Porous magnetic hollow carbon microspheres (MHCMs) were fabricated with a high surface area and superior adsorption performance for reusable RB removal.

Cited by 18 publications

References 41 publications

Counter Anion-Directed Growth of Iron Oxide Nanorods in a Polyol Medium with Efficient Peroxidase-Mimicking Activity for Degradation of Dyes in Contaminated Water

Counter Anion-Directed Growth of Iron Oxide Nanorods in a Polyol Medium with Efficient Peroxidase-Mimicking Activity for Degradation of Dyes in Contaminated Water

From Polymer to Magnetic Porous Carbon Spheres: Combined Microscopy, Spectroscopy, and Porosity Studies

Adsorption of the anionic dye (Diamond Fast Brown KE) from textile wastewater onto chitosan/montmorillonite nanocomposites

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