Facile synthesis of mesoporous composite Fe/Al2O3–MCM-41: an efficient adsorbent/catalyst for swift removal of methylene blue and mixed dyes

Pradhan, Amaresh C.; Parida, Kulamani

doi:10.1039/c2jm30451a

Cited by 49 publications

(41 citation statements)

References 64 publications

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“…Li et al have reported the synthesis of TiO 2 /graphene oxide core–shell nanoparticles and used them as an adsorbent for the removal of Congo red 36. Pradhan et al reported the synthesis of Fe/Al 2 O 3 ‐MCM‐41 nanoparticles and used them as an adsorbent for the adsorption of mixtures of methylene blue and methyl orange 37. To the best of our knowledge, the use of nanoparticles with core–shell, yolk–shell, and nanorattle morphologies as adsorbents for the adsorption of mixtures of dyes has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Silica@Ni‐Co Mixed Metal Oxide Core–Shell Nanorattles and Their Potential Use as Effective Adsorbents for Waste Water Treatment

Kandula

Jeevanandam

2015

Eur J Inorg Chem

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SiO2@Ni‐Co mixed metal oxide core–shell nanorattles with different Ni2+/Co2+ molar ratios have been successfully synthesized through a facile, inexpensive self‐template route by the calcination of SiO2@Ni‐Co layered double hydroxides at 500 °C. The formation of SiO2@Ni‐Co mixed metal oxide core–shell nanorattles has been confirmed by an array of characterization techniques. Field‐emission scanning electron microscopy (FE‐SEM) analysis indicates a hierarchical flowerlike morphology for the SiO2@Ni‐Co mixed metal oxide core–shell nanorattles, and transmission electron microscopy (TEM) analysis confirms the formation of core–shell nanorattles. The diffuse reflectance spectra of the SiO2@Ni‐Co mixed metal oxide core–shell nanorattles show two band‐gap absorptions attributed to metal‐to‐ligand charge‐transfer transitions (Mn+→O2–). The SiO2@Ni‐Co mixed metal oxide core–shell nanorattles have been explored as effective adsorbents for the removal of rhodamine B, methylene blue, and their mixture from aqueous solutions. The adsorption of the single dye systems follows Langmuir and Freundlich isotherms, whereas a binary Langmuir model has been applied for the binary dye systems. The SiO2@Ni‐Co mixed metal oxide core–shell nanorattles possess higher adsorption capacity for the individual dyes than for the mixture of dyes. Kinetic studies indicate that the adsorptions of rhodamine B, methylene blue, and their mixture follow pseudo‐second‐order kinetics.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Silica@Ni‐Co Mixed Metal Oxide Core–Shell Nanorattles and Their Potential Use as Effective Adsorbents for Waste Water Treatment

Kandula

Jeevanandam

2015

Eur J Inorg Chem

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“…The S BET values decreased from 161 m 2 g −1 for Fe-Ce-1 to 144 m 2 g −1 for Fe-Ce-4. This may be due to the increased amount of CeO 2 blocking the pore structure of the catalysts and covering the catalyst surface (Alexiadis et al, 2011;Pradhan & Parida, 2012;Ramirez et al, 2007). SEM images of fresh and used Fe-Ce-0 and Fe-Ce-2 catalysts are shown in Fig 5, indicating that the surface morphology of the catalysts did no significantly change after their use.…”

Section: Resultsmentioning

confidence: 86%

“…Their shapes show that the isotherms are type IV standard isotherms (Sing, 1985), typical of mesoporous materials; also, an important hysteresis cycle was observed. Gen- erally, N 2 adsorption in the P/P 0 ranges between 0 and 0.01, 0.01 and 0.4, and 0.4 and 0.95 corresponds with the filling of micropores of size up to 0.8 nm, micropores of size 0.8-2.0 nm, and mesopores, respectively (Pradhan & Parida, 2012 of the Fe-Ce-x catalysts are listed in Table 1; S BET of Fe-Ce-0 was 165 m 2 g −1 , i.e., higher than those of the Ce-doped catalysts, which indicates that S BET decreased with the increasing Ce loading. The S BET values decreased from 161 m 2 g −1 for Fe-Ce-1 to 144 m 2 g −1 for Fe-Ce-4.…”

Section: Resultsmentioning

confidence: 99%

Catalytic wet peroxide oxidation of m-cresol over Fe/γ-Al2O3 and Fe–Ce/γ-Al2O3

Liu¹,

Wei²,

He³

et al. 2015

Chemical Papers

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Catalytic wet peroxide oxidation (CWPO) of m-cresol over Fe/γ-Al2O3 and Fe-Ce/γ-Al2O3 was studied. Catalysts were prepared using the incipient wetness impregnation method, and characterized using XRD, XPS, BET, and SEM techniques. Effects of Ce loading, H2O2 dose, initial solution pH, reaction temperature, and m-cresol concentration on the CWPO of m-cresol were investigated in detail. The results showed that an addition of 2 mass % Ce into Fe/γ-Al2O3 resulted in better catalytic activity over a wider pH range and at lower reaction temperatures, and with lower H2O2 consumption than when using the Fe/γ-Al2O3 catalysts only. The best catalytic activity was obtained using the Fe-Ce-2 catalyst with complete m-cresol degradation, 43.2 % TOC removal using 100 mmol L −1 H2O2 at pH 4.0 and 60 • C in 90 min. XPS showed that an addition of 2 mass % Ce increased the density of non-lattice oxygen on the catalyst surface facilitating electron transfer and thereby producing radicals and promoting catalytic activity in the CWPO reaction. Recycling experiments showed that Fe-Ce-2 retained its activity even after six subsequent runs without changing the morphology, and that iron ions did not significantly leach from the catalyst surface.

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“…3 shows the low-angle XRD patterns of original CMK-3 and modified CMK-3. The XRD patterns of CMK-3 and modified CMK-3 have three diffraction peaks, which can be indexed as (100), (110), and (200) reflections associated with hexagonal symmetry [17]. The presence of these three peaks in modified CMK-3 indicates that modified mesostructure has been retained and still has a high degree of hexagonal mesoscopic organization after ammonia modification.…”

Section: Structural and Textural Propertiesmentioning

confidence: 98%

Preparation of ordered mesoporous carbons with ammonia modification for Orange II adsorption

Peng

2014

Desalination and Water Treatment

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In this study, the ordered mesoporous carbon (CMK-3) was prepared using SBA-15 as hard-template and furfuryl alcohol as the carbon source and then ammonia modification via tube furnace under different temperatures. The effect of ammonia activation temperature and the sorption behavior of Orange II (O II) on ordered mesoporous carbons were investigated. The textural property and surface chemistry of the ordered mesoporous carbons also were investigated by N 2 adsorption, elemental analysis, and X-ray Photoelectron Spectroscopy. Results indicated that the formation of mesopores volume, specific surface area, total pore volume, and the average pore diameter could be enhanced with ammonia modification for the mesoporous carbon. Furthermore, the nitrogen content of as-prepared samples increased with increasing modification temperature. In addition, the results indicated that the mesoporous carbon CMK-3-1173 treated at 900˚C has developed specific surface area and abundant mesopores, which showed the largest adsorption capacity for O II among all samples investigated.

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Facile synthesis of mesoporous composite Fe/Al2O3–MCM-41: an efficient adsorbent/catalyst for swift removal of methylene blue and mixed dyes

Cited by 49 publications

References 64 publications

Synthesis of Silica@Ni‐Co Mixed Metal Oxide Core–Shell Nanorattles and Their Potential Use as Effective Adsorbents for Waste Water Treatment

Synthesis of Silica@Ni‐Co Mixed Metal Oxide Core–Shell Nanorattles and Their Potential Use as Effective Adsorbents for Waste Water Treatment

Catalytic wet peroxide oxidation of m-cresol over Fe/γ-Al2O3 and Fe–Ce/γ-Al2O3

Preparation of ordered mesoporous carbons with ammonia modification for Orange II adsorption

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