scholarly journals One-Pot Synthesis of Chlorophyll-Assisted Exfoliated MoS2/WS2 Heterostructures via Liquid-Phase Exfoliation Method for Photocatalytic Hydrogen Production

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2436
Author(s):  
I-Wen P. Chen ◽  
Yan-Ming Lai ◽  
Wei-Sheng Liao
Keyword(s):  
Hydrogen Production ◽  
Synthesis Method ◽  
Solar Irradiation ◽  
One Pot ◽  
Neutral Electrolyte ◽  
The Individual ◽  
Bulk Mos2 ◽  
Ws2 Nanosheets ◽  
Simulated Solar Irradiation ◽  
First Time

Developing strategies for producing hydrogen economically and in greener ways is still an unaccomplished goal. Photoelectrochemical (PEC) water splitting using photoelectrodes under neutral electrolyte conditions provides possibly one of the greenest routes to produce hydrogen. Here, we demonstrate that chlorophyll extracts can be used as an efficient exfoliant to exfoliate bulk MoS2 and WS2 to form a thin layer of a MoS2/WS2 heterostructure. Thin films of solution-processed MoS2 and WS2 nanosheets display photocurrent densities of −1 and −5 mA/cm2, respectively, and hydrogen evolution under simulated solar irradiation. The exfoliated WS2 is significantly more efficient than the exfoliated MoS2; however, the MoS2/WS2 heterostructure results in a 2500% increase in photocurrent densities compared to the individual constituents and over 12 h of PEC durability under a neutral electrolyte. Surprisingly, in real seawater, the MoS2/WS2 heterostructure exhibits stable hydrogen production after solar illumination for 12 h. The synthesis method showed, for the first time, how the MoS2/WS2 heterostructure can be used to produce hydrogen effectively. Our findings highlight the prospects for this heterostructure, which could be coupled with various processes towards improving PEC efficiency and applications.

One Pot Microwave Irradiation Synthesis of Spherical and Nanotube Titanates Incorporated Reduced Graphene for Efficient Hydrogen Production Photo-Electrocatalytically

2021 ◽  
Author(s):  
Mohamed Mohamed ◽  
Mahmoud M. Hessien ◽  
Mohamed M. Ibrahim
Keyword(s):  
Hydrogen Production ◽  
Microwave Irradiation ◽  
Particle Diameter ◽  
Hybrid Structure ◽  
High Rate ◽  
Solar Irradiation ◽  
High Quantum Yield ◽  
One Pot ◽  
Reduced Graphene ◽  
A Current

Abstract Nanosphere and nanotube titanates (TNT) amalgamated with different graphene oxide (GO) ratios synthesized by one pot microwave irradiation route have presented excellent potential towards hydrogen production photoelectrochemically under solar irradiation. The hybrid nanospherical array of the 50TNT-50GO photocatalyst showed a current density equal 9.2 mA cm-2 at a bias of 0.20 V vs. RHE exceeding those of the nanotubes 30TNT-70GO (4.0 mA cm-2 at 0.38 V) and 10TNT-90GO (3.7 mA cm-2 at 0.4 V). The former electrode also exhibits small Tafel slope value (40 mV dec-1), decreased particle diameter (7 nm), decreased band gap (2.6 eV) and high rate of charges transfer. The hybrid structure elucidation carried out using TEM-SAED, XRD, N2 adsorption, UV-Vis, FTIR and PL techniques approved the interfacial interaction between TNT and GO(RGO) networks that was responsible for the high quantum yield, delay of charges recombination beside the increase in the pore volume.

scholarly journals Photocatalytic Degradation of Tobacco Tar Using CsPbBr3 Quantum Dots Modified Bi2WO6 Composite Photocatalyst

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2422
Author(s):  
Runda Huang ◽  
Menglong Zhang ◽  
Zhaoqiang Zheng ◽  
Kunqiang Wang ◽  
Xiao Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Degradation ◽  
Solar Irradiation ◽  
Composite Photocatalyst ◽  
Polycyclic Aromatic ◽  
Cigarette Paper ◽  
Novel Applications ◽  
Simulated Solar Irradiation ◽  
First Time ◽  
Cspbbr3 Quantum Dots

Polycyclic aromatic hydrocarbons (PAHs) in tobacco tar are regarded as a significant threat to human health. PAHs are formed due to the incomplete combustion of organics in tobacco and cigarette paper. Herein, for the first time, we extended the application of CsPbBr3 quantum dots (CsPbBr3) to the photocatalytic degradation of tobacco tar, which was collected from used cigarette filters. To optimize the photoactivity, CsPbBr3 was coupled with Bi2WO6 for the construction of a type-II photocatalyst. The photocatalytic performance of the CsPbBr3/Bi2WO6 composite was evaluated by the degradation rate of PAHs from tobacco tar under simulated solar irradiation. The results revealed that CsPbBr3/Bi2WO6 possesses a large specific surface area, outstanding absorption ability, good light absorption and rapid charge separation. As a result, in addition to good stability, the composite photocatalyst performed remarkably well in degrading PAHs (over 96% were removed in 50 mins of irradiation by AM 1.5 G). This study sheds light on promising novel applications of halide perovskite.

scholarly journals One-Pot Synthesis of Sulfur-Doped TiO2/Reduced Graphene Oxide Composite (S-TiO2/rGO) with Improved Photocatalytic Activity for the Removal of Diclofenac from Water

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1621
Author(s):  
Marin Kovačić ◽  
Klara Perović ◽  
Josipa Papac ◽  
Antonija Tomić ◽  
Lev Matoh ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Charge Recombination ◽  
Solar Irradiation ◽  
One Pot ◽  
Doped Tio2 ◽  
X Ray ◽  
Sulfur Doping ◽  
Reduced Graphene ◽  
Simulated Solar Irradiation

Sulfur-doped TiO2 (S-TiO2) composites with reduced graphene oxide (rGO), wt. % of rGO equal to 0.5%, 2.75%, and 5.0%, were prepared by a one-pot solvothermal procedure. The aim was to improve photocatalytic performance in comparison to TiO2 under simulated solar irradiation for the treatment of diclofenac (DCF) in aqueous medium. The obtained composites were characterized for physical-chemical properties using thermogravimetric analysis (TGA), X-ray diffractograms (XRD), Raman, scanning electron microscopy (SEM)/energy dispersive X-ray (EDX), Brauner Emmett Teller (BET), and photoluminescence (PL) analyses, indicating successful sulfur doping and inclusion of rGO. Sulfur doping and rGO have successfully led to a decrease in photogenerated charge recombination. However, both antagonistic and synergistic effects toward DCF treatment were observed, with the latter being brought forward by higher wt.% rGO. The composite with 5.0 wt.% rGO has shown the highest DCF conversion at pH 4 compared to that obtained by pristine TiO2, despite lower DCF adsorption during the initial dark period. The expected positive effects of both sulfur doping and rGO on charge recombination were found to be limited because of the subpar interphase contact with the composite and incomplete reduction of the GO precursor. Consequent unfavorable interactions between rGO and DCF negatively influenced the activity of the studied S-TiO2/rGO photocatalyst under simulated solar irradiation.

scholarly journals Glucose-Assisted One-Pot Hydrothermal Synthesis of Hierarchical-Structured MoS2/C Quasi-Hollow Microspheres for High-Performance Lithium Ion Battery

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 837
Author(s):  
Xingang Liu ◽  
Jiang Tan ◽  
Xi Li ◽  
Chuhong Zhang
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Hydrothermal Process ◽  
Rate Capability ◽  
Lithium Ion ◽  
Nucleating Agent ◽  
Hollow Microspheres ◽  
One Pot ◽  
Bulk Mos2 ◽  
First Time

In this work, hierarchical MoS2/C quasi-hollow microspheres are prepared by a one-pot hydrothermal process with the addition of glucose. The glucose is not only inclined to form the roundish sphere in the completion of the synthesis of MoS2, but at the same time the microspheres formed by the glucose can act as the nuclei on which the MoS2 grows. Glucose, acting as a nucleating agent, has the advantages of being low-cost and environmentally friendly, which can simplify the fabrication process. The interiors of the MoS2/C samples are multi-hole and quasi-hollow, which is beneficial for the insertion and extraction of lithium ions. For the first time, we demonstrate that hierarchical-structured MoS2/C quasi-hollow microspheres exhibit an excellent cycling stability and rate capability in lithium ion batteries (LIBs) and are significantly superior to the bulk MoS2. The method presented in this article may provide a simple, clean. and economical strategy for the preparation of MoS2/C microspheres as a feasible and promising anode material for LIBs.

Facile One-Step Preparation and Efficient Photocatalytic Hydrogen Production of Composite MoS2/g-C3N4 Sensitized by Erythrosin B

NANO ◽  
2020 ◽  
Vol 15 (10) ◽  
pp. 2050127
Author(s):  
Mingcai Yin ◽  
Yixian Li ◽  
Kaiyue Liang ◽  
Jiangfan Sun ◽  
Yaoting Fan ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Photophysical Properties ◽  
Production Performance ◽  
One Pot ◽  
Photocatalytic Hydrogen Production ◽  
Erythrosin B ◽  
Production Activity ◽  
One Step ◽  
Calcination Method ◽  
First Time

MoS2/g-C3N4 (g-C3N4 [Formula: see text] graphitic carbon nitride) composite is considered as a promising photocatalyst for hydrogen production, while the preparation method still needs to be improved. Herein for the first time, nanosized MoS3 and melamine were used as starting materials and a facile one-pot calcination method was successfully applied for the synthesis of MoS2/g-C3N4. The physical and photophysical properties of the as-prepared MoS2/g-C3N4 were characterized by XRD, IR, SEM, TEM and XPS techniques. Sensitized by Erythrosin B (EB), the photocatalytic hydrogen production performance of MoS2/g-C3N4 was investigated and the amount of MoS2 was optimized. An excellent H2 production activity of 1091.2[Formula: see text][Formula: see text] was achieved for 43% MoS2/g-C3N4, which is about 330 times that of pure g-C3N4 (3.3[Formula: see text][Formula: see text]. In addition, its performance was compared with those of three other MoS2/g-C3N4 samples prepared by conventional methods and a possible mechanism of H2 production was proposed based on the photoluminescence and photoelectrochemical results.

Photocatalytic Hydrogen Production from Water Splitting on CdS and Cd0.8Zn0.2S Nanorods: Influence of Ni(OH)2 Modification

2013 ◽  
Vol 805-806 ◽  
pp. 1291-1296 ◽  
Author(s):  
Juan Li ◽  
Xin Jun Li
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Solar Irradiation ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
Cds Nanorods ◽  
Transmission Electron ◽  
Composite Photocatalysts ◽  
Simulated Solar Irradiation

The composite photocatalysts of Ni (OH)2modified Cd1-xZnxS (x=0, 0.2) nanorods were synthesized via a simple deposition-precipitation method using nanorods as support and Ni (NO3)2as nickel hydroxide precursor. The structures, morphologies and optical properties of the catalysts were characterized by X-ray diffraction, scanning electron microscopy, high resolution transmission electron spectroscopy and UV-visible absorption spectroscopy. The photoactivities of the catalysts were examined toward hydrogen production by water splitting under simulated solar irradiation. Results show that the catalyst of Ni (OH)2-Cd0.8Zn0.2S nanorods exhibits a significantly enhanced H2-production activity in compared to the Ni (OH)2-CdS nanorods. The reason for the different effects of Ni (OH)2modification on the photoactivities of the two catalysts was discussed, and the possible mechanism related to the photocatalytic process was proposed.

scholarly journals Sustainable ecofriendly phytoextract mediated one pot green recovery of chitosan

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Judy Gopal ◽  
Manikandan Muthu ◽  
Thirumalai Dhakshanamurthy ◽  
Ki Jun Kim ◽  
Nazim Hasan ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Biomedical Research ◽  
Biological Systems ◽  
Synthesis Method ◽  
Solid Wastes ◽  
One Pot ◽  
The Core ◽  
Core Idea ◽  
Chitin And Chitosan ◽  
First Time

Abstract Chitin and chitosan are biopolymers that have diverse applications in medicine, agriculture, food, cosmetics, pharmaceuticals, wastewater treatment and textiles. With bio-origins, they easily blend with biological systems and show exemplified compatibility which is mandatory when it comes to biomedical research. Chitin and chitosan are ecofriendly, however the processes that are used to recover them aren’t ecofriendly. The focus of this work is to attempt an ecofriendly, sustainable phytomediated one pot recovery of chitosan from commercial chitin and from crab and shrimp shells and squid pen solid wastes. Graviola extracts have been employed, given the fact file that their active ingredients acetogenins actively interact with chitin in insects (resulting in its application as an insecticide). With that as the core idea, the graviola extracts were chosen for orchestrating chitin recovery and a possible chitin to chitosan transformation. The results confirm that graviola extracts did succeed in recovery of chitosan nanofibers from commercial chitin flakes and recovery of chitosan particles directly from solid marine wastes of crab, shrimp and squids. This is a first time report of a phyto-extract mediated novel chitosan synthesis method.

An increase in hydrogen production from light and ethanol using a dual scale porosity photocatalyst

2018 ◽  
Vol 20 (10) ◽  
pp. 2299-2307 ◽  
Author(s):  
Y. X. Chen ◽  
V. Gombac ◽  
T. Montini ◽  
A. Lavacchi ◽  
J. Filippi ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Aqueous Solutions ◽  
Solar Irradiation ◽  
Dual Porosity ◽  
Nanotube Array ◽  
Production Of Hydrogen ◽  
Simulated Solar Irradiation ◽  
Dual Scale

The stable photocatalytic production of hydrogen is demonstrated under simulated solar irradiation from the aqueous solutions of ethanol over a dual porosity 3D TiO2 nanotube array (TNTA).

Victorian Pain

2017 ◽  
Author(s):  
Rachel Ablow
Keyword(s):  
Nineteenth Century ◽  
Victorian Literature ◽  
Social Life ◽  
Charles Darwin ◽  
Harriet Martineau ◽  
The Status ◽  
History Of ◽  
The Individual ◽  
Natural Philosophers ◽  
First Time

The nineteenth century introduced developments in science and medicine that made the eradication of pain conceivable for the first time. This new understanding of pain brought with it a complex set of moral and philosophical dilemmas. If pain serves no obvious purpose, how do we reconcile its existence with a well-ordered universe? Examining how writers of the day engaged with such questions, this book offers a compelling new literary and philosophical history of modern pain. The book provides close readings of novelists Charlotte Brontë and Thomas Hardy and political and natural philosophers John Stuart Mill, Harriet Martineau, and Charles Darwin, as well as a variety of medical, scientific, and popular writers of the Victorian age. The book explores how discussions of pain served as investigations into the status of persons and the nature and parameters of social life. No longer conceivable as divine trial or punishment, pain in the nineteenth century came to seem instead like a historical accident suggesting little or nothing about the individual who suffers. A landmark study of Victorian literature and the history of pain, the book shows how these writers came to see pain as a social as well as a personal problem. Rather than simply self-evident to the sufferer and unknowable to anyone else, pain was also understood to be produced between persons—and even, perhaps, by the fictions they read.

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