Effects of hydrothermal temperature on the morphology and photoelectrocatalytic performance of TiO2-based nanomaterials photoelectrode

2015 ◽  
Vol 08 (04) ◽  
pp. 1550034 ◽  
Author(s):  
Dong Li ◽  
Xiujuan Yu ◽  
Xiuwen Cheng
Keyword(s):  
Three Dimensional ◽  
Photogenerated Electron ◽  
Comparative Investigation ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Photoelectrochemical Performance ◽  
Electron Hole ◽  
Hydrothermal Temperature ◽  
Dimensional Network ◽  
Hole Recombination

TiO 2-based nanomaterials (BNMs) photoelectrode was successfully synthesized via a facile and controllable hydrothermal procedure. The as-prepared TiO 2-BNMs photoelectrode was characterized by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). The resulting TiO 2-BNMs samples assembled by different morphologies were obtained through changing hydrothermal temperature that were: (i) One-dimensional (relative to nanosheets) nanobelts at 140°C, (ii) two-dimensional nanosheets at 160–180°C and (iii) three-dimensional network nanowires at 200–220°C. Structural investigation of the obtained nanomaterials revealed that the content of anatase increased as increasing the apparent dimensionality of the materials. The photoelectrochemical performance of TiO 2-BNMs photoelectrode was elucidated by comparative investigation on the electron transport and electron–hole (e-/h+) recombination in TiO 2-BNMs sample with typically morphology. The photoelectrochemical performance of the TiO 2-BNMs sample was obviously dependent on the morphology. Compared to the nanobelts and the network nanowires structure, the two-dimensional nanosheets displayed the more effective photogenerated electron transfer and reduced electron–hole recombination rate. Moreover, two-dimensional nanosheets had significantly enhanced photoelectrocatalytic efficiency for degradation of methyl orange (MO).

Poly[[μ-(1-azaniumylethane-1,1-diyl)bis(hydrogen phosphonato)]sodium]: a powder X-ray diffraction study

2013 ◽  
Vol 69 (8) ◽  
pp. 815-818 ◽  
Author(s):  
Mwaffak Rukiah ◽  
Thaer Assaad
Keyword(s):  
Hydrogen Bonding ◽  
Rietveld Method ◽  
Three Dimensional ◽  
Coordination Geometry ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dimensional Network ◽  
Distorted Octahedral Coordination Geometry ◽  
Distorted Octahedral

The title two-dimensional coordination polymer, [Na(C2H8NO6P2)]n, was characterized using powder X-ray diffraction data and its structure refined using the Rietveld method. The asymmetric unit contains one Na+cation and one (1-azaniumylethane-1,1-diyl)bis(hydrogen phosphonate) anion. The central Na+cation exhibits distorted octahedral coordination geometry involving two deprotonated O atoms, two hydroxy O atoms and two double-bonded O atoms of the bisphosphonate anion. Pairs of sodium-centred octahedra share edges and the pairs are in turn connected to each other by the biphosphonate anion to form a two-dimensional network parallel to the (001) plane. The polymeric layers are connected by strong O—H...O hydrogen bonding between the hydroxy group and one of the free O atoms of the bisphosphonate anion to generate a three-dimensional network. Further stabilization of the crystal structure is achived by N—H...O and O—H...O hydrogen bonding.<!?tpb=18.7pt>

Syntheses, Structures and Photoluminescent Properties of the Two Novel Coordination Polymers [Cd(pydc)2(tu)]n and [Cd2(SO4)(nic)2(tu)1.5(H2O)2]n (pydc = Pyridine-2,3-dicarboxylate, nic = Nicotinate, tu = Thiourea)

2011 ◽  
Vol 66 (5) ◽  
pp. 459-464 ◽  
Author(s):  
Chao Xu ◽  
Sheng-Bo Liu ◽  
Taike Duan ◽  
Qun Chen ◽  
Qian-Feng Zhang
Keyword(s):  
Hydrogen Bonds ◽  
Coordination Polymers ◽  
Room Temperature ◽  
Three Dimensional ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
One Dimensional ◽  
X Ray ◽  
Dimensional Network

Two novel cadmium coordination polymers, [Cd(pydc)2(tu)]n (1) and [Cd2(SO4)(nic)2(tu)1.5 - (H2O)2]n (2) (pydc = pyridine-2,3-dicarboxylate, nic = nicotinate, tu = thiourea), have been synthesized under hydrothermal conditions and structurally characterized by X-ray diffraction analysis. 1 is a one-dimensional ladder coordination polymer in a two-dimensional network formed by hydrogen bonds. 2 consists of two kinds of Cd(II) centers in different coordination environments connected via nicotinate and sulfate to form a two-dimensional grid network integrated in a three-dimensional framework generated by hydrogen bonds. 2 shows intense fluorescent emission in the solid state at room temperature

scholarly journals TiO2 Nanoparticles Anchoring on Two-Dimensional Bi2Se3 Nanosheet As An Enhanced Visible Light Catalyst

2021 ◽  
Author(s):  
Chengbin Guo ◽  
Rong Hu ◽  
Hui Qiao ◽  
Chenguang Duan ◽  
Xiang Qi
Keyword(s):  
Visible Light ◽  
Coupling Effect ◽  
Photogenerated Electron ◽  
Photocurrent Density ◽  
High Specific Surface Area ◽  
Ultraviolet Region ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
Photocatalytic Application

Abstract Titanium dioxide (TiO2) has been widely studied in the field of photocatalysis. However, the development of TiO2 was limited by the photoresponse only in the ultraviolet region and the rapid recombination of photogenerated electron-hole pairs. In this work, TiO2 and two-dimensional (2D) bismuth selenide (Bi2Se3) hybrid nanosheets (TiO2/Bi2Se3 HNs) have been prepared via a simple ultrasonic route. X-ray diffraction pattern and Raman spectra were carried out to confirm that as-prepared samples were pure and well crystalized. Besides, the microstructure characterization proves that 2D Bi2Se3 nanosheets have high specific surface area and can serve as a stable platform to construct the intimate interaction with TiO2. Furthermore, photoelectrochemical (PEC) measurements demonstrate that the TiO2/Bi2Se3 HNs exhibit excellent photocatalytic performance under visible light, which were much better than pure TiO2 and Bi2Se3. More importantly, the photocurrent density was quite stable and only dropped by 10% after 125 cycles. In summary, the improved photocatalytic activity is due to the unique characteristic of 2D Bi2Se3 nanosheets, such as maximized reaction sites and good electrical conductivity, and the positive coupling effect of the TiO2/Bi2Se3 heterojunction. This study indicates that TiO2/Bi2Se3 HNs photocatalysts have excellent potential for photocatalytic application.

A New 2D Zinc(II)-Organic Framework with Dinuclear Units Based on Iodinated Terephthalate: Synthesis, Crystal Structure and Luminescence Behavior

2014 ◽  
Vol 69 (8) ◽  
pp. 859-863 ◽  
Author(s):  
Kai Cui ◽  
Ji Ma ◽  
Xian-Kuan Huo ◽  
Jian-Xun Zhang
Keyword(s):  
Three Dimensional ◽  
Solvothermal Reaction ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dimensional Network ◽  
Benzenedicarboxylic Acid ◽  
Secondary Building Units ◽  
Thermal Stability Of ◽  
Luminescence Behavior

A new coordination polymer [Zn(BDC-I2)(DMF)]n (1) has been prepared by solvothermal reaction of Zn(II) nitrate with 2,5-diiodo-1,4-benzenedicarboxylic acid (H2BDC-I2) in ethanol-DMF, and characterized by elemental analysis, IR spectroscopy and single-crystal and powder X-ray diffraction techniques. Complex 1 shows a two-dimensional network possessing dinuclear Zn2(CO2)4 secondary building units, which are further assembled into a three-dimensional supramolecular structure through intermolecular C-H···I interactions. Solid-state properties such as photoluminescence and thermal stability of 1 have also been investigated.

scholarly journals Polar crystal of vanillylformamide through replacement of the alkene by an isosteric formamide group

IUCrData ◽  
2018 ◽  
Vol 3 (12) ◽  
Author(s):  
Pierre Baillargeon ◽  
Tarik Rahem ◽  
Carl Amigo ◽  
Daniel Fortin ◽  
Yves L. Dory
Keyword(s):  
Hydrogen Bonds ◽  
Three Dimensional ◽  
Molecular Shape ◽  
Biologically Active ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Polar Crystal ◽  
Dimensional Network ◽  
Structural Database ◽  
Parallel Fashion

Vanillylformamide [systematic name:N-(4-hydroxy-3-methoxybenzyl)formamide], C9H11NO3, (II), has been synthesized from vanillylamine hydrochloride and studied by single-crystal X-ray diffraction. Compound (II) and the well known biologically active eugenol compound (I) can be considered to be `isosteres' of each other, since they share comparable molecular shape and volume. The product (II) crystallizes in the space groupP1. In the crystal, the vanillylformamide molecules are linked mainly by N—H...O, O—H...O and Csp2—H...O hydrogen bonds, forming infinite two-dimensional polar sheets. These two-dimensional layers pack in a parallel fashion, constructing a polar three-dimensional network. Except for van der Waals forces and weak Csp3—H...O hydrogen bonds, there are no significant intermolecular interactions between the layers. A Cambridge Structural Database search revealed that vanillylamide-related crystals are scarce.

Enhanced visible-active photocatalytic behaviors observed in Mn-doped BiFeO3

2018 ◽  
Vol 32 (17) ◽  
pp. 1850185 ◽  
Author(s):  
Yun-Hui Si ◽  
Yu Xia ◽  
Ya-Yun Li ◽  
Shao-Ke Shang ◽  
Xin-Bo Xiong ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Diffuse Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
X Ray ◽  
Mn Doped ◽  
Hole Recombination ◽  
Narrow Band Gap Semiconductors

A series of BiFeO3 and BiFe[Formula: see text]Mn[Formula: see text]O3 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by a hydrothermal method. The samples were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy (EDS) and UV–Vis diffuse reflectance spectroscopy, and their photocatalytic activity was studied by photocatalytic degradation of methylene blue in aqueous solution under visible light irradiation. The band gap of BiFeO3 was significantly decreased from 2.26 eV to 1.90 eV with the doping of Mn. Furthermore, the 6% Mn-doped BiFeO3 photocatalyst exhibited the best activity with a degradation rate of 94% after irradiation for 100 min. The enhanced photocatalytic activity with Mn doping could be attributed to the enhanced optical absorption, increment of surface reactive sites and reduction of electron–hole recombination. Our results may be conducive to design more efficient photocatalysts responsive to visible light among narrow band gap semiconductors.

scholarly journals 2-Amino-3-carboxypyridinium perchlorate

2012 ◽  
Vol 68 (6) ◽  
pp. o1601-o1602 ◽  
Author(s):  
Fadila Berrah ◽  
Sofiane Bouacida ◽  
Hayet Anana ◽  
Thierry Roisnel
Keyword(s):  
Hydrogen Bonds ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Asymmetric Unit ◽  
Dimensional Network

The asymmetric unit includes two crystallographically independent equivalents of the title salt, C6H7N2O2 +·ClO4 −. The cations and anions form separate layers alternating along the c axis, which are linked by N—H...O, O—H...O and C—H...O hydrogen bonds into a two-dimensional network parallel to (100). Further C—H...O contacts connect these layers, forming a three-dimensional network, in which R 4 4(20) rings and C 2 2(11) infinite chains can be identified.

Sign in / Sign up

Export Citation Format

Share Document