Abstract:Titania
has recently been identified as a new and effective nonlight-driven
catalyst for degradation of organic pollutant with the use of H
2
O
2
as an oxidant; however, either relatively low
surface area or lack of diversity in chemical composition largely
limits its catalytic performance. In this work, a series of transition-metal
ion (Mn
2+
, Co
2+
, Ni
2+
, and Cu
2+
)-d… Show more
“…Nanomaterials in 3D hierarchical structures such as urchin-like and flower-like (F) offer novel catalytic properties owing to its large surface areas. Li et al [ 117 ] have combined the advantage of 3D hierarchical structure of titania with dopants to synthesize titania nanoflower with variety of transition metal (Mn 2+ , Co 2+ , Ni 2+ , and Cu 2+ ) dopants ( Figure 7 ). Such synthesized catalysts when tested for degradation of methylene blue dye in presence of hydrogen peroxide @30°C, metal-doped titania nanoflowers accomplished the degradation in 60–100 min, while just the control nanoflower titania had achieved only 35% degradation.…”
Section: Applications Of Titania As Photocatalystmentioning
confidence: 99%
“… Figure 7. SEM images of a) titania precursor b) F-TiO 2 c) Mn-FTiO 2 d) Co-FTiO 2 e) Ni-FTiO 2 f) Cu-FTiO 2 [ 117 ] …”
Section: Applications Of Titania As Photocatalystmentioning
Titania is considered to be one of the most versatile material in its nanoform. Scientific community looks towards it to address various pressing global problems. One such problem is aquatic pollution arising from organic chemicals such as dyes, pesticides, antibiotics etc. due to industrial, domestic and agricultural activities. Titania proves to be very effective to address this problem owing to its superior photocatalytic properties. In this review, we will review the recent advances in titania-based nanocomposites. The recent advances discussed in this review include synthesis of titania, modification of titania, exploration of various supports such as silica, carbon, graphene etc., that is documented to enhance its environmental remediation properties.
“…Nanomaterials in 3D hierarchical structures such as urchin-like and flower-like (F) offer novel catalytic properties owing to its large surface areas. Li et al [ 117 ] have combined the advantage of 3D hierarchical structure of titania with dopants to synthesize titania nanoflower with variety of transition metal (Mn 2+ , Co 2+ , Ni 2+ , and Cu 2+ ) dopants ( Figure 7 ). Such synthesized catalysts when tested for degradation of methylene blue dye in presence of hydrogen peroxide @30°C, metal-doped titania nanoflowers accomplished the degradation in 60–100 min, while just the control nanoflower titania had achieved only 35% degradation.…”
Section: Applications Of Titania As Photocatalystmentioning
confidence: 99%
“… Figure 7. SEM images of a) titania precursor b) F-TiO 2 c) Mn-FTiO 2 d) Co-FTiO 2 e) Ni-FTiO 2 f) Cu-FTiO 2 [ 117 ] …”
Section: Applications Of Titania As Photocatalystmentioning
Titania is considered to be one of the most versatile material in its nanoform. Scientific community looks towards it to address various pressing global problems. One such problem is aquatic pollution arising from organic chemicals such as dyes, pesticides, antibiotics etc. due to industrial, domestic and agricultural activities. Titania proves to be very effective to address this problem owing to its superior photocatalytic properties. In this review, we will review the recent advances in titania-based nanocomposites. The recent advances discussed in this review include synthesis of titania, modification of titania, exploration of various supports such as silica, carbon, graphene etc., that is documented to enhance its environmental remediation properties.
“…Zhou and coworkers synthesized 3D hierarchical titania nanosphere with flower‐like morphologies by doping transition metal ions such as Mn 2+ , Co 2+ , Ni 2+ , and Cu 2+ into TiO 2 catalyst (Figure 16(A−F)) [43] . The flower‐like morphologies were synthesized by a hydrothermal process followed by calcination.…”
Section: Flowers Made Of Inorganic Materialsmentioning
confidence: 99%
“… SEM micrographs of (A) pTiO 2 , (B) FTiO 2 , (C) Mn−FTiO 2 , (D) Co−FTiO 2 , (E) Ni−FTiO 2 , and (F) Cu−FTiO 2 as reported by Zhou and coworkers. Reprinted from [43] permission of the American Chemical Society. And the SEM micrographs of (G) NiCo 2 O 4 , (H) NiO and (I) Co 3 O 4 as reported by Elakkiya et al.…”
Section: Flowers Made Of Inorganic Materialsmentioning
Mimicking natural objects such as flowers, is an objective of scientists not only because of their attractive appearance, but also to understand the natural phenomena that underpin real world applications such as drug delivery, enzymatic reactions, electronics, and catalysis, to name few. This article reviews the types, preparation methods, and structural features of flower‐like structures along with their key applications in various fields. We discuss the various types of flower‐like structures composed of inorganic, organic‐inorganic hybrid, inorganic‐protein, inorganic‐enzyme and organic compositions. We also discuss recent development in flower‐like structures prepared by self‐assembly approaches. Finally, we conclude our review with the future prospects of flower‐like micro‐structures in key fields, being biomedicine, sensing and catalysis.
“…However, the exact mechanism behind the promotional nature of these doping agents is still unknown in many cases. It is now well documented that many metal oxide catalysts (CeO 2 , Fe 3 O 4 , TiO 2 , and ZnO) once doped with transition-metal ions can exhibit markedly enhanced catalytic performances toward various organic transformations, and further, wide range of comparative studies involving different transition-metal ions are also available. − To the best of our knowledge, no reports have been found which focused on the comparison of different oxidation states of a single transition-metal ion as a dopant. Keeping these points in mind, we have synthesized Mn 3+ - and Mn 2+ -doped Pd@ l -dopa functionalized ZnO-coated Fe 3 O 4 catalysts and compared the activities of these doped nano-metal catalysts with their undoped counterparts for C–C coupling, reduction, and oxidation.…”
In spite of the enhanced catalytic
performances exhibited by the
doped transition nano-metal catalysts, understanding and unraveling
the mechanistic part behind the promotional nature of dopants remains
a challenge. The present work involves a comparative analysis of Mn3+- and Mn2+-doped supported Pd nano-catalysts with
undoped counterparts for C–C coupling, reduction, and oxidation.
Efforts were made to gain deep insights into the promotional role
of dopant ions. X-ray photoelectron spectroscopy spectra of fresh
and reused catalysts in case of each organic transformation provided
mechanistic insights into the role of dopant ions which has proved
helpful in formulating mechanisms where the electronic synergism between
dopants and reactant/metal nanoparticles has been depicted. The effect
of Mn3+ ions on the electronic environment of aryl halide
in case of C–C coupling makes the Mn3+-doped nano-catalyst
more efficient, as compared to Mn2+-doped and undoped nano-catalysts.
The strong electronic interactions between Mn2+ and Pd
make the Mn2+-doped nano-catalyst efficiently active and
selective for reduction and oxidation. The present approach provides
proper evidence for the changes/interactions that are induced by the
introduction of dopants in heterogeneous nano-metal catalysts. Consequently,
the underlying synthetic route to design efficient doped heterogeneous
transition nano-metal catalysts and a deeper mechanistic view of the
promotional role of dopant will prove to be a promising approach in
the field of heterogeneous nano-metal catalysis.
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