Photocatalytic activities of hollow and hierarchical Bi3.15Nd0.85Ti3O12 microspheres synthesized through a hydrothermal process

Ba0.6Mg0.4TiO3 (BMT) particles with different morphologies were synthesized through hydrothermal method and their optical and photocatalytic properties were investigated. Their crystal structure and microstructures were characterized using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). XRD patterns demonstrate that the as-prepared samples are tetragonal structure. FESEM shows that BMT crystals can be fabricated in different morphologies by simply manipulating the reaction parameters of hydrothermal process. The UV-visible diffuse reflectance spectra (UV-vis DRS) reveal that the band gaps of BMT photocatalysts are about 2.37 - 2.51 eV. The as-prepared BMT photocatalysts exhibite higher photocatalytic activities in the degradation of methyl orange (MO) under visible light irradiation (λ > 420 nm) compared with traditional N-doped TiO2 (N-TiO2) and pure BaTiO3 (BTO). The high photocatalytic performance of BMT photocatalysts could be attributed to the recombination restraint of the e-/h+ pairs resulting from doping of Mg2+ ions. The influence of morphologies upon the photocatalytic properties of BMT was studied. Furthermore, BMT nanowires reveal the highest photocatalytic activity. Up to 94.0% MO is decolorized after visible light irradiation for 360 min.

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Synthesis and Characterization of Graphene Oxide-Modified Bi2WO6and Its Use as Photocatalyst

International Journal of Photoenergy ◽

10.1155/2016/8730806 ◽

2016 ◽

Vol 2016 ◽

pp. 1-8 ◽

Cited By ~ 9

Author(s):

Xiaoyue Hu ◽

Xiangchao Meng ◽

Zisheng Zhang

Keyword(s):

Photocatalytic Activity ◽

Graphene Oxide ◽

Hydrothermal Process ◽

Charge Carriers ◽

Synthesis And Characterization ◽

High Adsorption ◽

Dye Pollutants ◽

Photocatalytic Activities ◽

Template Free

A Bi2WO6photocatalyst modified with graphene was synthesized in a two-step template-free hydrothermal process. The prepared samples were characterized to explore their properties. The photocatalytic activities of the prepared samples were investigated by degrading dye model, Rhodamine B (RhB), under visible light irradiation. This showed that the modified Bi2WO6photocatalyst with 1.2 wt% of graphene greatly improved photocatalytic activity during the degradation of dye pollutants, compared to pure Bi2WO6. The enhancement can be interpreted as the integrated effects of ultrahigh charge carriers’ mobility and high adsorption of RhB on graphene. Additionally, effects including catalysts dosage amount, pH of RhB solution, and temperature of reactor on the photocatalytically degrading RhB were also studied and discussed.

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Photocatalytic activities of Bi2S3/BiOBr nanocomposites synthesized by a facile hydrothermal process

Applied Surface Science ◽

10.1016/j.apsusc.2013.11.055 ◽

2014 ◽

Vol 290 ◽

pp. 233-239 ◽

Cited By ~ 56

Author(s):

Yumin Cui ◽

Qingfeng Jia ◽

Huiquan Li ◽

Jingyu Han ◽

Liangjun Zhu ◽

...

Keyword(s):

Hydrothermal Process ◽

Photocatalytic Activities ◽

Facile Hydrothermal Process

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Rod-Shaped Carbon Aerogel-Assisted CdS Nanocomposite for the Removal of Methylene Blue Dye and Colorless Phenol

Crystals ◽

10.3390/cryst10040300 ◽

2020 ◽

Vol 10 (4) ◽

pp. 300

Author(s):

Saradh Prasad ◽

P. Shanmugam ◽

K. Bhuvaneswari ◽

G. Palanisamy ◽

T. Pazhanivel ◽

...

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Narrow Band ◽

Photophysical Properties ◽

Phenol Degradation ◽

Hydrothermal Process ◽

Carbon Aerogel ◽

Cds Nanoparticles ◽

Blue Dye ◽

Photocatalytic Activities

A carbon aerogel (CA)-assisted CdS nanocomposite was prepared by hydrothermal process and was investigated as a photocatalyst towards the photodegradation of methylene blue (MB) dye and colorless phenol under visible light irradiation (VLI). CdS have attracted wide attention due to their relatively narrow band gap for the visible light effect and the suitably negative potential of the conduction band (CB) edge for the neutralization of H+ ions. The obtained characterization results suggest that the CA-assisted CdS nanocomposite has enhanced photophysical properties, a more surface area, and the desired morphology at the nm scale. Under optimization, CdS CA 8% shows superior catalytic activity for degradation compared with other samples. The photocatalytic activities of the as-synthesized samples were examined under VLI through the MB and phenol degradation. Compared with pure CA and CdS, the CA (8%)-assisted CdS nanoparticles (NPs) offer significantly enhanced photocatalytic efficiency for MB and phenol. The mechanism of photocatalytic reaction was examined by adding various scavengers, and the results revealed that the holes generated in CA (8%)-assisted CdS NPs have a crucial impact on the visible light photocatalytic process. The improved photocatalytic degradation was due to the strong interaction between the CA and CdS NPs.

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Correlation between photoluminescence spectra with gas sensing and photocatalytic activities in hierarchical ZnO nanostructures

RSC Advances ◽

10.1039/c6ra27737c ◽

2017 ◽

Vol 7 (16) ◽

pp. 9826-9832 ◽

Cited By ~ 27

Author(s):

T. Anh Thu Do ◽

Ho Truong Giang ◽

Do Van Huong ◽

Pham Quang Ngan ◽

Giang Hong Thai ◽

...

Keyword(s):

Gas Sensing ◽

Hydrothermal Process ◽

Zno Nanostructures ◽

Photoluminescence Spectra ◽

Photocatalytic Activities ◽

Different Types ◽

Zinc Salts

We synthesized ZnO architectures, including nanorods, porous plates, and flower-like architectures by using different types of zinc salts and surfactants in a hydrothermal process.

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Investigating on Structural, Optical, Magnetic and Photocatalytic Activities of ZnS and Co2+: ZnS NPs Synthesized by Hydrothermal Process Under MeB Dye

10.21203/rs.3.rs-866114/v1 ◽

2021 ◽

Author(s):

S. Upputuri ◽

S. Lakshmanan ◽

Ramalakshmi N ◽

S. Arul Antony

Keyword(s):

Room Temperature ◽

Dopant Concentration ◽

Hydrothermal Process ◽

Average Crystallite Size ◽

Band Gap Energy ◽

Cubic Phase ◽

Chemical Route ◽

Photocatalytic Activities ◽

Uv Visible ◽

Electron Trapping Center

Abstract In present work, the structural, morphological, optical and photocatalytic activities of ZnS and Co2+: ZnS NPs were prepared through chemical route as hydrothermal process at room temperature. ZnS and Co2+: ZnS were characterized by using various techniques such as, XRD, SEM-EDX, TEM-SAED, UV-visible, PL and BET. The spherical-like morphology with the average crystallite size was found to be 8 to 15 nm. Among them results, it showed that the Co2+ atoms were incorporated into the ZnS lattice, forming cubic phase as the Co2+ dopant concentration increases from 0 to 2 %. The band gap energy of the ZnS and Co2+: ZnS increases from 3.5 to 4.10 eV, which enables stronger absorption of UV region. During catalytic process, Co2+ act as electron trapping center, which inhibits the recombination of the photo induced holes and electrons as showed higher degradation efficiency for MeB.

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Synthesis of tapered tetragonal nanorods of anatase TiO2 with enhanced photocatalytic activity via a sol–hydrothermal process mediated by H2O2 and NH3

Journal of Materials Chemistry A ◽

10.1039/c5ta02396c ◽

2015 ◽

Vol 3 (29) ◽

pp. 15265-15273 ◽

Cited By ~ 10

Author(s):

Linlin Zhang ◽

Long Tian ◽

Yongxin Liu ◽

Taixing Tan ◽

Dan Liu ◽

...

Keyword(s):

Photocatalytic Activity ◽

Band Structure ◽

Surface Area ◽

Electronic Band Structure ◽

Hydrothermal Process ◽

Anatase Tio2 ◽

Large Surface Area ◽

Electronic Band ◽

Photocatalytic Activities ◽

Unique Surface

Enhanced photocatalytic activities of tapered tetragonal nanorods of anatase TiO2 mediated by H2O2 and NH3 were ascribed to their large surface area, unique surface heterojunction and superior electronic band structure.

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New Insights into Cd2+/Fe3+ Co-Doped BiOBr for Enhancing the Photocatalysis Efficiency of Dye Decomposition under Visible-Light

Nanomaterials ◽

10.3390/nano11020423 ◽

2021 ◽

Vol 11 (2) ◽

pp. 423

Author(s):

Hong Sheng ◽

Wei Wang ◽

Rong Dai ◽

Jing Ning ◽

Lei Zhang ◽

...

Keyword(s):

Synergistic Effects ◽

Hydrothermal Process ◽

The Novel ◽

Dye Decomposition ◽

Microwave Hydrothermal ◽

Photodegradation Mechanism ◽

Ion Doping ◽

Photocatalytic Activities ◽

Impurity Bands ◽

Co Doped

Uniform flowerlike microspheres Cd2+/Fe3+ co-doped BiOBr were prepared with the aid of the microwave hydrothermal process. The results indicate that the degradation performance of Bi1−xCdxOBr and Bi1−xFexOBr are 1.31 and 2.05 times that of BiOBr for RhB, respectively. Moreover, the novel Cd2+/Fe3+ co-doped BiOBr photocatalysts with ~0.42 eV impurity bands presented remarkably enhanced photocatalytic activities with being 3.10 times that of pure BiOBr, by achieving e−/h+ efficient separation and narrowed bandgap with the ions synergistic effect of Cd2+ and Fe3+. Based on DFT insights, the photodegradation mechanism was systematically studied that the conversion of multivalent Fe3+ ions promoted the production of •O2−, and Cd2+ ions worked as electron transfer mediators, which elucidated that the •O2− and h+VB mainly participated in the catalytic reaction. The experimental and theoretical results show that the synergistic effects of multi-ion doping have great potential in the field of photocatalysis.

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Hydrothermal Synthesis of Hydrangea-Like F-Doped Titania Microspheres for the Photocatalytic Degradation of Carbamazepine under UV and Visible Light Irradiation

Journal of Nanomaterials ◽

10.1155/2012/583417 ◽

2012 ◽

Vol 2012 ◽

pp. 1-8 ◽

Cited By ~ 5

Author(s):

Miaomiao Ye ◽

Yulong Yang ◽

Yan Zhang ◽

Tuqiao Zhang ◽

Weiyun Shao

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Large Scale ◽

Hydrothermal Process ◽

Average Diameter ◽

Ammonium Fluoride ◽

Light Irradiation ◽

Good Crystallinity ◽

Photocatalytic Activities ◽

Doped Titania

Hydrangea-like F-doped TiO2microspheres have been synthesized on a large scale by a simple hydrothermal process using potassium titanium oxalate as the titanium source, ammonium fluoride and hydrogen peroxide as the etchant. The photocatalytic activities were evaluated using carbamazepine as the target organic molecule under UV and visible light irradiation. Structural characterization indicates that the hydrangea-like TiO2microspheres, with an average diameter of 2.80 μm, are composed of numerous anatase TiO2petals. Moreover, it is found that both the NH4F and H2O2dosages have important effects on the formation of the hydrangea-like structures. In addition, photocatalytic experiments show that the hydrangea-like TiO2microspheres calcined at 500°C exhibit high photocatalytic efficiency under both UV and visible light irradiation. The enhanced photocatalytic activity can be attributed to the successful fluorine doping, good crystallinity, and the unique nanostructures.

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