Influence of CuO morphology on the enhanced catalytic degradation of methylene blue and methyl orange

Deka, Pangkita; Hazarika, Ankita; Deka, Ramesh Chandra; Bharali, Pankaj

doi:10.1039/c6ra20173c

Cited by 61 publications

(51 citation statements)

References 61 publications

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“…Cases arise where the less active sides of the catalyst are exposed to the dye in order to get adsorbed, resulting in relatively little decrease in MB concentration in after certain interval like at the first and forth reading Figure a and in third reading in Figure b. Similar results were also reported previously because of the change in the surface morphology of the catalyst …”

Section: Resultssupporting

confidence: 86%

“…Similar results were also reported previously because of the change in the surface morphology of the catalyst. [51,52] We also studied the interaction of MB with the Cu(II)-SB-NR and Cu(I)-SB-NR@Si via cyclic voltammetric study. MB in water with KCl as electrolyte shows two cathodic signals at À0.44 V and À1.19 V against Ag/AgCl as reference electrode and GCE (glassy carbon electrode) as working electrode.…”

Section: Catalytic Degradation Of Methylene Bluementioning

confidence: 99%

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Non-Hydrothermal Synthesis of Cu(I)-Microleaves from Cu(II)-Nanorods

et al. 2016

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Simultaneous transformation of structural morphology, material dimension and oxidation state of Cu (II)‐nanorod was achieved with 3‐(Triethoxysilyl)propylamine, (APTS) and 4‐nitrobenzaldehyde (4‐NB) under non‐hydrothermal condition. Morphology of the modified Cu(I) material was found to resemble with the leaf of colocasea. Conversion of a Cu(II) based nono‐material to a Cu(I)‐based micro‐material was confirmed from EPR, MAS‐ NMR and cyclic voltametric (CV) study. BET‐surface area, Raman signal intensity and thermal stability of the Cu(I)‐microleaf was greatly enhanced due to presence of Cu‐O−Si linkage. Both the Cu(II) and Cu(I) material were found to be effective catalyst systems for nitro‐aldol reaction as well as catalytic oxidation of methylene blue (MB) dye in presence of H2O2. High %yield (>90 %) of nitro‐aldol product was obtained with both the catalyst. Catalytic reaction under microwave irradiation was found to bring substantial decrease in reaction time. Cu (II)‐material was however not recyclable because of its soft nature. While the Cu(I)‐microleaf was recycled upto four consecutive cycles. These materials were found to degrade methylene blue dye within 20 min in presence of H2O2 but in absence of light. Dark phase catalytic oxidation of MB was monitored both via UV‐vis and cyclic voltametric study.

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Section: Resultssupporting

confidence: 86%

Section: Catalytic Degradation Of Methylene Bluementioning

confidence: 99%

Non-Hydrothermal Synthesis of Cu(I)-Microleaves from Cu(II)-Nanorods

et al. 2016

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“…When evaluating the photocatalytic efficiency of the CuO synthesized in this work, it is noticed that the CuNH05 sample showed an increase of 11% in the RNL discoloration in relation to the CuNa05 sample. According to literature 3,34,36 , the change in morphology and surface properties, including higher specific surface area, may be the cause of the enhanced activity. But in this case the shape of particles also influences the photodegradation.…”

Section: Photocatalytic Efficiencymentioning

confidence: 99%

“…Among the range of inorganic semiconductors, CuO has attracted attention due to its easy production, as well as its high chemical and thermal stability, and adjustable electronic properties 33,34 . As a photocatalyst for discoloration of organic dyes, CuO was evaluated for the degradation of rhodamine B, methyl orange, tartrazine and methylene blue 3,[35][36] . Either way, the CuO has presented high catalytic activity, being attributed to morphological and superficial aspects.…”

Section: Introductionmentioning

confidence: 99%

CuO Rapid Synthesis with Different Morphologies by the Microwave Hydrothermal Method

et al. 2018

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CuO structures were synthesized by microwave hydrothermal treatment using two different mineralizing agents (NaOH and NH 4 OH) and were evaluated as photocatalysts. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area analysis. The XRD patterns indicated the formation of the monoclinic phase in both samples with 13.78 and 14.23 nm crystallite size. SEM analysis showed different agglomerates morphologies based on the mineralization agent employed. The CuO nanostructure synthesized with NH 4 OH presented agglomerated like-plates which results in a spherical shape, whereas the material synthesized with NaOH presented an agglomerate of larger plates. Both samples showed photocatalytic activity against RNL azo dye. The quasi-spherical shape CuO material reached 93 % of the discoloration.

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“…In recent years morphology dependent catalytic properties of nanomaterials have received wide attention. Motivated by several outstanding reports, we focused in this direction and synthesized different morphology of CuO nanostructures via precursor mediated two step hydrothermal methods. The X‐ray diffraction and Raman spectroscopic analyses confirmed the formation of the monoclinic phase of CuO (Figure a, b).…”

Section: Cu Oxide‐based Nanoparticle Catalystsmentioning

confidence: 99%

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

Deka

Borah

Saikia

et al. 2018

The Chemical Record

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This account provides an overview of current research activities on nanoparticles containing the earth-abundant and inexpensive element copper (Cu) and Cu-based nanoparticles, especially in the field of environmental catalysis. The different synthetic strategies with possible modification of the chemical/ physical properties of these nanoparticles using such strategies and/or conditions to improve catalytic activity are presented. The design and development of support and/or bimetallic systems (e. g., alloys, intermetallic, etc.) are also included. Herein, we report synthetic approaches of Cu and Cu-based nanoparticles (monometallic copper, bimetallic copper and copper (II) oxide nanoparticles/nanostructures) and impregnation of such nanoparticles onto support material (e. g., Co O nanostructure), along with their applications as environmental catalyst for various oxidation and reduction reactions. Finally, this account provides necessary advances and perspectives of Cu-based nanoparticles in the environmental catalysis.

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Influence of CuO morphology on the enhanced catalytic degradation of methylene blue and methyl orange

Abstract: The sheet-like CuO shows enhanced catalytic activity, compared to polycrystalline CuO for the catalytic degradation of methylene blue and methyl orange.

Cited by 61 publications

References 61 publications

Non-Hydrothermal Synthesis of Cu(I)-Microleaves from Cu(II)-Nanorods

Non-Hydrothermal Synthesis of Cu(I)-Microleaves from Cu(II)-Nanorods

CuO Rapid Synthesis with Different Morphologies by the Microwave Hydrothermal Method

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

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