Size-dependent visible-light-enhanced Cr(VI) bioreduction by hematite nanoparticles

Chemosphere ◽  
2022 ◽  
pp. 133633
Author(s):  
Cheng Yu ◽  
Lu Yu ◽  
Abdelkader Mohamed ◽  
Jun Fang ◽  
Yichao Wu ◽  
...  
Keyword(s):  
Visible Light ◽  
Hematite Nanoparticles ◽  
Size Dependent

Size-Dependent Effect of Cu2O Nanocubes in Electrochemical and Photocatalytic Properties

2018 ◽  
Vol 18 (12) ◽  
pp. 8282-8288 ◽  
Author(s):  
Yuanyuan Tang ◽  
Yinlong Xu ◽  
Caiyu Qi ◽  
Xianyang Li ◽  
Enming Xing ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Visible Light ◽  
Electrochemical Impedance ◽  
Linear Sweep Voltammetry ◽  
Absorption Capacity ◽  
Electrochemical Impedance Spectra ◽  
Size Dependent ◽  
Eis Measurements ◽  
20 Nm ◽  
Degradation Of Methyl Orange

Cu2O nanocubes with different size (ranging from 20 nm to 400 nm) were prepared by a seed-mediated method to systematically explore the strong size-dependent properties in photocatalytic degradation of methyl orange (MO). Cu2O nanotubes were characterized by TEM, XRD, UV-Vis measurements. The size-dependent photocatalytic efficiency of the Cu2O nanocubes was evaluated by degradation of methyl orange (MO) in water under visible light (λ > 420 nm) irradiation. Furthermore, the photocurrent, linear sweep voltammetry (LSV) and electrochemical impedance spectra (EIS) measurements were applied to elucidate the size-dependent properties of Cu2O nanocubes, which demonstrated that smaller Cu2O nanocubes with certain length (30 nm) showed higher current density, faster electron transfer and lower rate of charge recombination in their exposed (100) facet. Therefore, 30 nm Cu2O nanocubes showed stronger visible light absorption capacity and higher photocatalytic activity in MO degradation among a series of nanocubes (20, 30, 100, 130, 200 and 400 nm) and their corresponding photocatalytic activities decreased with increasing the particles sizes.

Size-dependent performance of CdSe quantum dots in the photocatalytic evolution of hydrogen under visible light irradiation

2016 ◽  
Vol 518 ◽  
pp. 176-180 ◽  
Author(s):  
Ivan Grigioni ◽  
Massimo Bernareggi ◽  
Giovanna Sinibaldi ◽  
Maria Vittoria Dozzi ◽  
Elena Selli
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Cdse Quantum Dots ◽  
Size Dependent

scholarly journals Size-Dependent Visible Light Photocatalytic Performance of Cu2 O Nanocubes

ChemCatChem ◽  
2018 ◽  
Vol 10 (16) ◽  
pp. 3554-3563 ◽  
Author(s):  
Sekar Karthikeyan ◽  
Santosh Kumar ◽  
Lee J. Durndell ◽  
Mark A. Isaacs ◽  
Christopher M. A. Parlett ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Size Dependent ◽  
Visible Light Photocatalytic

Morphology and Size-Dependent Visible-Light-Driven Photocatalytic Hydrogen Evolution of Porphyrin Assemblies

MRS Advances ◽  
2019 ◽  
Vol 4 (38-39) ◽  
pp. 2071-2078 ◽  
Author(s):  
Yong Zhong ◽  
Yaoqing Hu ◽  
Jiefei Wang ◽  
Jinghan Wang ◽  
Xitong Ren ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Efficient Energy Transfer ◽  
Photocatalytic Hydrogen Evolution ◽  
Size Dependent ◽  
Actual Application ◽  
Aspect Ratios ◽  
Visible Light Driven ◽  
Sacrificial Agent ◽  
Application Requirements

ABSTRACTPhotocatalytic water splitting to form hydrogen can effectively alleviate energy and environmental problems attracting wide attention. However, the current photocatalysts have low photocatalytic efficiencies due to the narrow absorption spectrum, which is far from the actual application requirements. Herein, we use the as-prepared zinc porphyrin self-assemblies to visible-light-drive photocatalytic hydrogen evolution with Pt as the cocatalyst and ascorbic acid (AA) as the sacrificial agent. The results exhibit morphology-dependent performance and hexagonal stacks achieved optimal H2 evolution rate (47.1 mmol/h/g), then followed by nanodiscs, nanorod and tetragonal stacks, meanwhile the nanorods with different aspect ratios show size-dependent properties. The UV-vis absorption and photoluminescence spectra and the shortening of decay time of the corresponding ZnTPyP aggregates reveal that the well-defined self-assembled porphyrin networks are J-aggregation and boost efficient energy transfer with respect to monomer. Such porphyrin self-assemblies are standing for one of the most promising photosensitizers in photocatalysis field and provide an important reference for designing the next generation of hydrogen production.

Ag size-dependent visible-light-responsive photoactivity of Ag–TiO2 nanostructure based on surface plasmon resonance

2014 ◽  
Vol 2 (46) ◽  
pp. 19861-19866 ◽  
Author(s):  
Zhuo Jiang ◽  
Qin Ouyang ◽  
Bosi Peng ◽  
Youxiang Zhang ◽  
Ling Zan
Keyword(s):  
Surface Plasmon Resonance ◽  
Visible Light ◽  
Surface Plasmon ◽  
Growth Mechanism ◽  
Plasmon Resonance ◽  
Ag Nps ◽  
Size Dependent ◽  
Tio2 Nanostructure

The proposed growth mechanism of Ag NPs during PAg–TiO2 (A) and SAg–TiO2 (B) preparation processes.

Sign in / Sign up

Export Citation Format

Share Document