Morphogenesis of ZnO nanostructures: role of acetate (COOH−) and nitrate (NO3−) ligand donors from zinc salt precursors in synthesis and morphology dependent photocatalytic properties

Kumar, Neeraj; Mittal, Hemant; Reddy, Leelakrishna; Nair, P. Sreekumari; Ngila, Jane Catherine; Parashar, Vyom

doi:10.1039/c5ra04162g

Cited by 70 publications

(31 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The development of various morphologies for Mn 2 O 3 has been investigated by different synthetic methodologies as a function of salt concentration, pH of the medium, solvent types, templates, and reaction temperature. There are examples of precursor dependent morphology evolution in case of ZnO, CdS, Cu 2 S and CdSe . Similar studies for the manganese‐based oxides are not reported to the best of our knowledge.…”

Section: Introductionsupporting

confidence: 66%

Manganese Trioxide with Various Morphologies: Applications in Catalytic Dye Degradation

et al. 2020

View full text Add to dashboard Cite

Hierarchical manganese trioxides (Mn 2 O 3 ) with different morphologies are prepared by thermal treatment of carbonate precursors synthesized using a facile and template-free hydrosolvothermal method. Various morphologies of Mn 2 O 3 have evolved as a function of precursor salts keeping the solvent system and temperature of synthesis intact. On hydrosolvothermal treatment, manganese carbonate with different microstructures is formed first and on subsequent calcination at 500°C, the carbonates are converted into manganese trioxide with the retention of the initial microstructure. While formation of Mn 2 O 3 microcubes is achieved with MnCl 2 and Mn (NO 3 ) 2 as precursor salts, microspheres and microflakes are obtained with Mn(OAc) 2 and MnC 2 O 4 precursors, respectively. The average microcrystal size varied from ∼ 10-20 (� 5) μm with somewhat high surface areas. The catalytic dye degradatin studies conducted on Mn 2 O 3 microcubes and microspheres in aqueous acidic mediums show rapid removal of dyes in the dark. While an aqueous acidic solution of methyl orange (MO) is decolorized in 2 min, more than 90 % of rhodamine B (RhB) and methylene blue (MB) are degraded within 50-60 min. Retention of catalytic activity after five cycles indicates their reusability and promise as simple binary oxide catalysts for wastewater treatment.[a] V.

show abstract

Section: Introductionsupporting

confidence: 66%

Manganese Trioxide with Various Morphologies: Applications in Catalytic Dye Degradation

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Various morphologies of Cu-CuO/ZnO were also formed as the generated nuclei were surrounded by CH 3 COO − ions. This was followed by further structural evolution upon decomposition of the CH 3 COO − ions to give CO 2 [11]. It can also be observed that ZnO NPs grow on the surface of the Cu-CuO rods.…”

Section: Structural and Morphological Characterizationmentioning

confidence: 95%

“…As expected, the XRD pattern of Cu-CuO/ZnO contained peaks corresponding to Cu, CuO, and ZnO nanomaterials. More specifically, intense sharp peaks (as indicated by *) at 43.35° (111), 50.49° (200), and 74.08° (220), suggest the formation of crystalline Cu NPs [32], while peaks at 31.76° 100 [11]. In this case, the presence of ZnO reduced the crystallinity of CuO in the Cu-CuO/ZnO composite.…”

Section: Structural and Morphological Characterizationmentioning

confidence: 95%

“…Due to establishment of force of electric field, the photogenerated electrons are shifted to conduction band (CB) of p-type CuO NPs to the CB of n-type ZnO. This leads to efficient separation of the photo-generated charge carriers (electrons and holes) at the CuO/ZnO heterojunction interface, resulting to lower recombination rate [42] [11,36,43,44]. The ROS can attack the reactive positions (i.e., the 9 and/ or 10 positions) of phenanthrene and disturb the electron arrangement of the phenanthrene aromatic rings, which results in the formation of intermediate products such as alcohol, ketone, and aldehyde derivatives [45].…”

Section: Kinetic Analysismentioning

confidence: 99%

“…One such PAHs is phenanthrene, which is also found in cigarettes and has been reported to lead to cardiovascular disease [7,8]. Although several techniques have been employed for the removal of organic pollutants from wastewater, complete removal has yet to be achieved [9][10][11][12]. In addition, a number of these techniques are undesirable, as they create sludge by-products and require a significant energy input to maintain high pressures [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photocatalytic activity of Gd2O2CO3·ZnO·CuO nanocomposite used for the degradation of phenanthrene

et al. 2018

Self Cite

View full text Add to dashboard Cite

Multimetal oxides nanocomposite photocatalysts based on Gd 2 O 2 CO 3 •ZnO•CuO were prepared by a co-precipitation method and carefully characterized using a range of analytical techniques. More specifically, analysis by X-ray diffraction and electron microscopies confirmed the identity and quality of the as-synthesized powders. The photocatalytic degradation activities of these nanocomposites towards phenanthrene were then investigated by measuring the effects of catalyst dosage, irradiation time, and oxidant addition. In addition, the pseudo first-order kinetic model was used to determine the rate constant of the degradation reaction. Optimum dosages of 0.6, 0.6, and 0.4 gL −1 were recorded when using CuO, Cu-CuO/ZnO, and Gd 2 O 2 CO 3 •ZnO•CuO, respectively. In addition, the Gd 2 O 2 CO 3 •ZnO•CuO composite exhibited a higher removal efficiency than both Cu-CuO/ZnO and the pure CuO nanoparticles. Furthermore, the addition of oxidants influenced the removal of phenanthrene from solution. Finally, the photocatalytic degradation data followed pseudo first-order kinetics as defined by the Langmuir-Hinshelwood model, which allowed prediction of the faster degradation rate by the Gd 2 O 2 CO 3 •ZnO•CuO nanocomposite. The newly synthesized nanocomposite could therefore be considered for the removal of phenanthrene and related polycyclic aromatic hydrocarbons from contaminated water.

show abstract

Factors Influencing the Photocatalytic Activity of Photocatalysts in Wastewater Treatment

Gusain

Kumar

Ray

2020

Photocatalysts in Advanced Oxidation Processes for Wastewater Treatment

View full text Add to dashboard Cite

Morphogenesis of ZnO nanostructures: role of acetate (COOH⁻) and nitrate (NO₃⁻) ligand donors from zinc salt precursors in synthesis and morphology dependent photocatalytic properties

Abstract: We investigated how the presence of one anion effects the overall ZnO growth in the presence of another anion.

Cited by 70 publications

References 58 publications

Manganese Trioxide with Various Morphologies: Applications in Catalytic Dye Degradation

Manganese Trioxide with Various Morphologies: Applications in Catalytic Dye Degradation

Photocatalytic activity of Gd2O2CO3·ZnO·CuO nanocomposite used for the degradation of phenanthrene

Factors Influencing the Photocatalytic Activity of Photocatalysts in Wastewater Treatment

Contact Info

Product

Resources

About