Synthesis, characterization and stability of Cr(III) and Fe(III) hydroxides

Papassiopi, Nymphodora; Vaxevanidou, K.; Christou, Christos N.; Karagianni, Eleftheria; Antipas, Georgios S.E.

doi:10.1016/j.jhazmat.2013.09.058

Cited by 133 publications

(75 citation statements)

References 31 publications

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“…The as-prepared Co hydroxide crystalizes in CoOOH (R-3m), which can be demonstrated by its XRD pattern ( Figure S8), The as-prepared Cr hydroxide has a extremely low crystallinity suggested by its corresponding XRD result ( Figure S8), but its FT-IR spectrum( Figure S9) is similar to previous reported Cr(OH)3. [27][28][29] The LSV plots of CoOOH, Cr(OH)3 and CoCr LDH are presented in Figure 6a. It's worth noting that the current density of CoCr LDH at 1.6 V (vs. RHE) is ~20 mA/cm 2 , which is 15 times larger than that of CoOOH (1.2 mA/cm 2 ) and 221 times larger than that of Cr(OH)3 (0.09 mA/cm 2 ).…”

Section: Electrochemical Performancementioning

confidence: 99%

Rational design of cobalt–chromium layered double hydroxide as a highly efficient electrocatalyst for water oxidation

et al. 2016

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The design of high performance, stable and cost-effective eletrocatalyst for oxygen evolution is crucial for the H2 production from electrochemical water splitting. Here, dual-functional-site catalyst, cobalt-chromium layer double hydroxide (CoCr LDH) nanosheets are designed and synthesized , where the Co 2+ is the catalytic active site and Cr 3+ is the charge transfer site.It's for the first time for OER investigation of CoCr LDH. The CoCr LDH nanosheets have high specific surface area of 151.78 m 2 g -1 and exhibit outstanding OER activities, among the best of Co-based candidates. Accordingly, our catalyst affords a low onset potential of 1.47 V (vs. reversible hydrogen electrode, RHE) and a stable current density of 22.8 mA cm -2 at 1.61 V (vs. RHE) for 12 h. The Tafel slope of CoCr LDH is 81.0 mV dec -1 , smaller than that of state-of-the-art RuO2 (90.1 mV dec -1 ). Therefore, the CoCr LDH nanosheets are promising OER catalysts.

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Section: Electrochemical Performancementioning

confidence: 99%

Rational design of cobalt–chromium layered double hydroxide as a highly efficient electrocatalyst for water oxidation

et al. 2016

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“…[28] Moreover,d ifferences among the three complexes for the band at 1385 cm À1 should be attributed to differentl igandsa round Fe III ;t his further demonstrates efficient chelation among CA, DA, and Fe III . [30] In other words, CA-Fe III appended to the surface of Au NPs can capture DA molecules in close proximity to the surface of the Au NPs and successfully amplify DA signals through asimple SERRS strategy. [29] The changes in UV/Vis absorption spectra ands olutionc olor between CA-Fe III and CA-Fe III -DA ( Figure S5 in the Supporting Information) furthers trongly verifiest hat DA is able to chelate with the CA-Fe III structure.…”

Section: Serrs Sensingmechanism For Sensitive Detection Of Damentioning

confidence: 99%

Functionalized Acupuncture Needle as Surface‐Enhanced Resonance Raman Spectroscopy Sensor for Rapid and Sensitive Detection of Dopamine in Serum and Cerebrospinal Fluid

Zhou

Cao

et al. 2017

Chemistry A European J

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It is a challenge to develop a robust sensor for simple, rapid operation and sensitive detection of neurotransmitters in complex specimens. Herein, ferric citrate functionalized gold nanoparticles (CA-Fe /Au NPs) are utilized to develop a facile sensor based on surface-enhanced resonance Raman spectroscopy (SERRS) for sensitive detection of dopamine (DA). The sensor is prepared by decorating the acupuncture needle with Au NPs, which enables sufficient surface-enhanced Raman spectroscopy enhancement. The CA-Fe structure is highly sensitive and selective for DA due to the formation of the CA-Fe -DA resonant structure; this indicates the advantages of capturing, carrying, and separating DA molecules from complicated samples in a simple operation. Furthermore, the practical application of the fabricated sensor is validated by the detection of DA in pretreated serum and cerebrospinal fluid of acupuncture-treated mice with detection limits of 0.1 and 2.5 nm DA, respectively. The developed active acupuncture needle sensor has potential benefits for sensitive detection and qualitative identification of DA molecules from biological samples.

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“…The FTIR absorption band centered at 3440 cm À1 was associated with the surface O-H groups of 2-line ferrihydrite. 34 A very strong and broad band consisting of two peaks at 457 and 582 cm À1 are typical for low crystalline ferrihydrite and these bands can be attributed to Fe-O. 21,32 The FTIR bands observed at 1458 and 1377 cm À1 resulted from carbonates, considering that ferrihydrite or so-called "amorphous" iron(III)-hydroxide was very susceptible to CO 2 from air.…”

Section: Fluoride Removal Mechanismmentioning

confidence: 99%

A facile precipitation synthesis of mesoporous 2-line ferrihydrite with good fluoride removal properties

et al. 2015

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Mesoporous 2-line ferrihydrite was synthesized through a facile precipitation method and was characterized by X-ray diffraction, transmission electron microscopy, and nitrogen adsorptiondesorption isotherms. The surface area of the obtained mesoporous 2-line ferrihydrite was 331.0 m 2 g À1 . The fluoride adsorption performance was investigated. Batch adsorption experiments were conducted to study the influence of various factors such as contact time, initial fluoride concentration, temperature, pH value and co-existing anions on the adsorption of fluoride. The fluoride adsorption process fitted well with the Langmuir model, and the maximum adsorption capacity was 23.89 mg g À1 at pH 7.0. It is worth mentioning that this adsorbent performed well over a considerably wide pH range of 3-9. The fluoride adsorption kinetics over the adsorbent can be well described by a pseudo-second-order kinetic model. Thermodynamic parameters including the Gibbs free energy, standard enthalpy and standard entropy were calculated, and the results suggested that the adsorption of fluoride on the mesoporous 2line ferrihydrite was thermodynamically favorable and exothermic in nature. Furthermore, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses revealed that the surface hydroxyl groups play an important part in the fluoride removal process.

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Synthesis, characterization and stability of Cr(III) and Fe(III) hydroxides

Cited by 133 publications

References 31 publications

Rational design of cobalt–chromium layered double hydroxide as a highly efficient electrocatalyst for water oxidation

Rational design of cobalt–chromium layered double hydroxide as a highly efficient electrocatalyst for water oxidation

Functionalized Acupuncture Needle as Surface‐Enhanced Resonance Raman Spectroscopy Sensor for Rapid and Sensitive Detection of Dopamine in Serum and Cerebrospinal Fluid

A facile precipitation synthesis of mesoporous 2-line ferrihydrite with good fluoride removal properties

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