A facile synthesis of graphene-like cobalt–nickel double hydroxide nanocomposites at room temperature and their excellent catalytic and adsorption properties

Song, Ji‐Ming; Ni, Jiangli; Zhang, Jie; Ling, Dan; Niu, Helin; Mao, Chang‐Jie; Zhang, Shengyi; Shen, Yuhua

doi:10.1007/s11051-014-2269-6

Cited by 19 publications

(13 citation statements)

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“…The XRD patterns of the silica samples indicated their amorphous nature. The XRD patterns of the pure Ni‐Co LDH ([Ni 2+ ]/[Co 2+ ] = 1:2) and SiO 2 @Ni‐Co LDH samples (PM1, PM2, and PM3) show four prominent peaks at 2 θ values of 12.15, 24.56, 33.47, and 59.48°, which are attributed to the (003), (006), (101), and (110) planes of α‐Co(OH) 2 and α‐Ni(OH) 2 38. Both α‐Co(OH) 2 and α‐Ni(OH) 2 have similar lattice constants, and their diffraction peaks are very close.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…It has been shown that this type of heterogeneous catalyst had significant catalytic activity towards the hydrolysis of ammonia borane and methylamine borane [437,438].…”

Section: Coeni Hybrid/graphene Heterogeneous Catalystmentioning

confidence: 99%

Graphene supported heterogeneous catalysts: An overview

Julkapli

Bagheri

2015

International Journal of Hydrogen Energy

436

179

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“…As θ increased to 51% and then to 67%, t i first increases and then decreases, following the inverse trends of surface area change. In comparison to suspended cobalt nano-catalysts [1,12]and cobalt nanoparticles supported on reduced graphene oxide [8,9] and hydrogel [10], LDO-Co exhibits a clear improvement in catalytic activity (cf . Table S1).…”

Section: Reactivity Of Ldo-co In Catalyzingp-nitrophenol Reduction Bymentioning

confidence: 99%

“…According to the London Metal Exchange, cobalt and palladium have a price ratio of approximately 1:750. According to their reactivities in catalyzing the model reaction of pnitrophenol reduction by borohydride, the ratio of their mass-normalized reactivities is less than 1:1000 [1,2], suggesting a discouragingeconomic loss if cobalt is used to replace palladium to remediate p-nitrophenol.…”

Section: Introductionmentioning

confidence: 99%

Highly active layered double hydroxide-derived cobalt nano-catalysts for p-nitrophenol reduction

Wang

et al. 2016

Applied Catalysis B: Environmental

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and Akron Avenue, Lubbock, TX 79409. AbstractReplacing precious noble-metal catalysts with non-precious metal ones is a well-recognized strategy for reducing the cost of catalytic water treatment. The implementation of this strategy is, however, challenging. To reduce the cost by using non-precious metal catalysts, the reactivity ratio between non-precious and precious metal catalysts must exceed their price ratio. Here, we report for the first timethat the parity condition has been surpassedfor cobalt (Co), in comparison to the most active precious metal catalyst made of palladium,in the catalytic reduction of pnitrophenol with borohydride. This is achieved by affixing Co nanoparticles on two-dimensional layered double oxide (LDO) nanodisks through thermal phase transformation of cobaltmagnesium-aluminum layered double hydroxide precursors. We show that the catalytic activity of LDO-Co is a function of Co molar fraction among metal cations.The highest reactivity is achieved at a molar fraction of 28%, giving a pseudo first order rate constant of 86(±3) min -1 at 25 o C for a catalyst dose of 1 g L -1 (as Co) and an initial p-nitrophenol concentration of 0.2 mM.Compared to other Co nano-catalysts described in the literature, the LDO-Co design has improved the reactivity of cobalt by at least 49 times. We further show that the high reactivity of LDO-Co remains after repeated reuse as well as after borohydride is replaced by formate, a moderate reductant and hydrogen donor. We propose that the high reactivity and superior longevity of LDO-Co are results of the heteroepitaxial fixation of cobalt on LDO through cobaltoxygen bonds that are similar to those in spinel cobalt oxide.

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A facile synthesis of graphene-like cobalt–nickel double hydroxide nanocomposites at room temperature and their excellent catalytic and adsorption properties

Cited by 19 publications

References 50 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

Graphene supported heterogeneous catalysts: An overview

Highly active layered double hydroxide-derived cobalt nano-catalysts for p-nitrophenol reduction

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