Ferrocenated nanocatalysts derived from the decomposition of ferrocenium in basic solution and their aerobic activities for the rapid decolorization of methylene blue and the facile oxidation of phenylboronic acid

Kumpan, Nuttapong; Poonsawat, Thinnaphat; Chaicharoenwimolkul, Laksamee; Pornsuwan, Soraya; Somsook, Ekasith

doi:10.1039/c6ra25515a

Cited by 27 publications

(19 citation statements)

References 37 publications

(32 reference statements)

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“…3 show a distinct peak at 1330 and 1384 cm −1 which indicates the presence of -C-N bonds of aromatic amines attributed to adsorption of MB on SCH. Also, the increase in peak intensity at 1597 cm −1 after adsorption indicates an increase in the number of -C = C bonds due to cyclic alkene probably due to adsorption of MB [49,50].…”

Section: Ftir Analysismentioning

confidence: 98%

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Murthy

Gowrishankar

2020

SN Appl. Sci.

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Coffee husk (CH) was physically and chemically treated with autoclaving (SCH) and NaOH (NCH) to develop low-cost adsorbent for the removal of methylene blue (MB) from synthetic wastewater, and their adsorption efficiencies were evaluated in batch mode. The prepared adsorbent was characterised by SEM, FTIR and point of zero charge. The central composite rotatable design (CCRD) was employed to optimise the adsorption process parameters such as pH, adsorbent dosage and initial MB concentration. The second-order quadratic model fitted best with the experimental adsorption data, and ANOVA results showed that the developed model was significant. The linear terms in the model significantly influence the adsorption capacity of SCH and NCH, but interaction terms were not significant. At optimised conditions, the developed adsorbents can remove > 90% of MB from the aqueous solution. Freundlich model showed a better fit with the adsorption isotherm data with R 2 greater than 0.95. Kinetics of MB adsorption onto SCH and NCH followed the pseudo-second-order model. The maximum monolayer adsorption capacity was found to be 129 and 200 mg/g for SCH and NCH, respectively. The present study showed that pretreated coffee husk waste can be used as an alternative for expensive adsorbents for the removal of dyes from wastewater.

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Section: Ftir Analysismentioning

confidence: 98%

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Murthy

Gowrishankar

2020

SN Appl. Sci.

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“…However, this process not only increases energy requirements due to the reduction potential of water (thermodynamic potential of −0.41 V vs standard hydrogen electrode at pH 7) and subsequent current leakage, [ 24 ] but also changes the solution chemistry through basification, which can severely impact separation performance due to the fouling of PVFc + active sites by nucleophilic hydroxide anions [ 21,25 ] or even chemical degradation of the ferrocene moieties. [ 26 ] Carbonaceous electrodes are widely employed in CDI processes for salt electrosorption, where typical operating potential windows can reach as high as 1 to 1.4 V, but significant improvements in salt adsorption capacity have been observed when Faradaic species are used over purely capacitive materials. [ 9b,24,27 ] To maintain the modularity of the electrochemical cell, the cathode can be functionalized with a Faradaic species to act as an electron sink, yielding an asymmetric electrochemical system.…”

Section: Introductionmentioning

confidence: 99%

An Asymmetric Iron‐Based Redox‐Active System for Electrochemical Separation of Ions in Aqueous Media

Tan

Hatton

2020

Adv Funct Materials

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Electrochemically mediated redox-active processes are gaining momentum as a promising liquid-phase separation technology. Compared to conventional systems, they offer potential benefits, such as smaller energy footprints, nondestructive operation, reversibility, and tunability for specific analyte removal, with clear applications to societal and industrial challenges like water treatment and chemical synthesis. An asymmetric Faradaic cell heterogeneously functionalized with a metallopolymer at the anode and a hexacyanoferrate material at the cathode is presented for the first time. The redox-active species' iron centers enhance the electrosorption of heavy metal oxyanions with up to 98% removal in the ppb range, and offer tunable operating windows as low as ≈0.1 V at ≈1 A m −2 . By avoiding water splitting, the hexacyanoferrate cathode imparts additional advantages, namely a fourfold reduction in adsorption energy requirements, full suppression of solution pH increase, and the ability to capture redox-active catalytic anions such as polyoxometalates without altering their bulk oxidation state. This hybrid framework of a polymeric ferrocene anode and crystalline hexacyanoferrate cathode allows for simultaneous and synergistic uptake of anions and cations, respectively, creating a new asymmetric scheme for water-based separations, with foreseeable future extension to fields such as ion-sensing, energy storage, and electrocatalysis.

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“…The other absorption occurring at 1238 cm −1 , 1729 cm −1 , 1735 cm −1 , and 3302 cm −1 corresponds to C-N stretching vibrations, C=O of amide, C-H stretching vibrations, CH 3 bending, and O-H of alcohol, respectively (Inyinbor et al 2016). On raphia fibers after sorption of methylene blue, one could observe compounds exhibited the dominant peak corresponding to the C-C stretching of methylene blue at 1600 cm −1 (Kumpan et al 2017).…”

Section: Sorbent Characterizationmentioning

confidence: 93%

Sorption behavior of methylene blue from aqueous solution by raphia fibers

Staroń

Chwastowski

Banach

2019

Int. J. Environ. Sci. Technol.

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This research shows a method of elimination of methylene blue from aqueous solutions using raphia fiber. Sorption was applied in a bath system and in the system with mixing and online measurement. The obtained data in equilibrium can suggest adjusting the sorption isotherm model and calculation of the maximum sorption capacities. The Langmuir isotherm model has the highest correlation coefficient R 2 which shows that the adsorption process of methylene blue on the raphia fibers is a monolayer adsorption process. On the other hand, the Freundlich isotherm is also well fitted, which may indicate that the isotherm is also well adapted, while in the system with mixing and online measurement, the highest matching factor is characterized by the Freundlich isotherm model. The pseudo-second-order rate model is best fit for the sorption kinetics, on basis of which it can be concluded that the sorption rate-limiting step is chemisorption.

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Ferrocenated nanocatalysts derived from the decomposition of ferrocenium in basic solution and their aerobic activities for the rapid decolorization of methylene blue and the facile oxidation of phenylboronic acid

Abstract: A strategic preparation of ferrocenated compounds as aerobic catalysts was successfully carried out for the decolorization of methylene blue and oxidation of phenylboronic acid without light irradiation and excess addition of hydrogen peroxide.

Cited by 27 publications

References 37 publications

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

An Asymmetric Iron‐Based Redox‐Active System for Electrochemical Separation of Ions in Aqueous Media

Sorption behavior of methylene blue from aqueous solution by raphia fibers

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