scholarly journals Metal Oxide-Based Photocatalytic Paper: A Green Alternative for Environmental Remediation

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 504
Author(s):  
Daniela Nunes ◽  
Ana Pimentel ◽  
Rita Branquinho ◽  
Elvira Fortunato ◽  
Rodrigo Martins
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Environmental Remediation ◽  
Low Cost ◽  
Future Perspective ◽  
Wet Chemical Synthesis ◽  
Earth Abundant ◽  
Recent Developments ◽  
Microorganism Inactivation ◽  
Nanostructured Metal Oxides

The interest in advanced photocatalytic technologies with metal oxide-based nanomaterials has been growing exponentially over the years due to their green and sustainable characteristics. Photocatalysis has been employed in several applications ranging from the degradation of pollutants to water splitting, CO2 and N2 reductions, and microorganism inactivation. However, to maintain its eco-friendly aspect, new solutions must be identified to ensure sustainability. One alternative is creating an enhanced photocatalytic paper by introducing cellulose-based materials to the process. Paper can participate as a substrate for the metal oxides, but it can also form composites or membranes, and it adds a valuable contribution as it is environmentally friendly, low-cost, flexible, recyclable, lightweight, and earth abundant. In term of photocatalysts, the use of metal oxides is widely spread, mostly since these materials display enhanced photocatalytic activities, allied to their chemical stability, non-toxicity, and earth abundance, despite being inexpensive and compatible with low-cost wet-chemical synthesis routes. This manuscript extensively reviews the recent developments of using photocatalytic papers with nanostructured metal oxides for environmental remediation. It focuses on titanium dioxide (TiO2) and zinc oxide (ZnO) in the form of nanostructures or thin films. It discusses the main characteristics of metal oxides and correlates them to their photocatalytic activity. The role of cellulose-based materials on the systems’ photocatalytic performance is extensively discussed, and the future perspective for photocatalytic papers is highlighted.

scholarly journals Starch-Based Hybrid Nanomaterials for Environmental Remediation

2021 ◽  
Author(s):  
Ashoka Gamage ◽  
Thiviya Punniamoorthy ◽  
Terrence Madhujith
Keyword(s):  
Metal Oxide ◽  
Environmental Remediation ◽  
Membrane Filtration ◽  
Anthropogenic Activities ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Volume Ratio ◽  
Hybrid Nanomaterials ◽  
Metal Metal

Environmental pollution is becoming a major global issue with increasing anthropogenic activities that release massive toxic pollutants into the land, air, and water. Nanomaterials have gained the most popularity in the last decades over conventional methods because of their high surface area to volume ratio and higher reactivity. Nanomaterials including metal, metal oxide, zero-valent ions, carbonaceous nanomaterials, and polymers function as adsorbents, catalysts, photocatalysts, membrane (filtration), disinfectants, and sensors in the detection and removal of various pollutants such as heavy metals, organic pollutants, dyes, industrial effluents, and pathogenic microbial. Polymer-inorganic hybrid materials or nanocomposites are highly studied for the removal of various contaminants. Starch, a heteropolysaccharide, is a natural biopolymer generally incorporated with other metal, metal oxide, and other polymeric nanoparticles and has been reported in various environmental remediation applications as a low-cost alternative for petroleum-based polymers. Therefore, this chapter mainly highlights the various nanomaterials used in environmental remediation, starch-based hybrid nanomaterials, and their application and limitations.

Recent developments of metal oxide based heterostructures for photocatalytic applications towards environmental remediation

2018 ◽  
Vol 267 ◽  
pp. 35-52 ◽  
Author(s):  
J. Theerthagiri ◽  
Sivaraman Chandrasekaran ◽  
Sunitha Salla ◽  
V. Elakkiya ◽  
R.A. Senthil ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Environmental Remediation ◽  
Recent Developments ◽  
Photocatalytic Applications

scholarly journals Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1026
Author(s):  
Shulin Yang ◽  
Gui Lei ◽  
Huoxi Xu ◽  
Zhigao Lan ◽  
Zhao Wang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensing ◽  
Response Times ◽  
Chemical Vapour ◽  
Pure Metal ◽  
Main Emphasis ◽  
Nanostructured Metal Oxides ◽  
Nanostructured Metal ◽  
Sensing Performance

The construction of heterojunctions has been widely applied to improve the gas sensing performance of composites composed of nanostructured metal oxides. This review summarises the recent progress on assembly methods and gas sensing behaviours of sensors based on nanostructured metal oxide heterojunctions. Various methods, including the hydrothermal method, electrospinning and chemical vapour deposition, have been successfully employed to establish metal oxide heterojunctions in the sensing materials. The sensors composed with the built nanostructured heterojunctions were found to show enhanced gas sensing performance with higher sensor responses and shorter response times to the targeted reducing or oxidising gases compare with those of the pure metal oxides. Moreover, the enhanced gas sensing mechanisms of the metal oxide-based heterojunctions to the reducing or oxidising gases are also discussed, with the main emphasis on the important role of the potential barrier on the accumulation layer.

Photodefinable Metal Oxide Dielectrics II: Direct Fabrication of Patterned High-k Dielectrics for Low Cost RF Capacitive MEMS Switches

2004 ◽  
Vol 833 ◽  
Author(s):  
Michael Romeo ◽  
Isaac Finger ◽  
Augustin Jeyakumar ◽  
Guoan Wang ◽  
John Papapolymerou ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Oxygen Plasma ◽  
Rf Mems ◽  
Dielectric Breakdown ◽  
Low Cost ◽  
Dielectric Constants ◽  
Mems Switches ◽  
Rf Mems Switches ◽  
Metal Organic

ABSTRACTIn this paper, recent advancements related to a novel approach for fabricating low cost capacitive radio frequency microelectromechanical (RF MEMS) switches using directly photodefinable high dielectric constant metal oxides are discussed. In this approach, a radiation sensitive metal-organic precursor is deposited via spin coating and converted patternwise to a metal oxide using exposure to ultraviolet light. The feasibility of this approach has previously been demonstrated by fabricating bridge-type and cantilever-type RF MEMS switches. These early experiments showed that the photopatterned oxides displayed dielectric breakdown strengths that were insufficient for reliable operation of MEMS switches which required actuation voltages on the order of 20 V to 30 V. Recent work has focused on developing advanced processes based on the photodefinable metal-organic approach that can produce oxides with higher dielectric breakdown strengths and higher dielectric constants. A variety of post-patterning processes, including thermal baking and oxygen plasma annealing, were investigated and the impact of such processing on the resulting dielectric properties are discussed in this paper. It is shown that a combination of thermal annealing and oxygen plasma treatment can substantially improve the dielectric breakdown strength of the metal oxides produced using the photosensitive metal-organic process.

Recent advances in ordered meso/macroporous metal oxides for heterogeneous catalysis: a review

2017 ◽  
Vol 5 (19) ◽  
pp. 8825-8846 ◽  
Author(s):  
Yuan Wang ◽  
Hamidreza Arandiyan ◽  
Jason Scott ◽  
Ali Bagheri ◽  
Hongxing Dai ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Porous Metal ◽  
Review Article ◽  
Oxide Catalysts ◽  
Present Review ◽  
Metal Oxide Catalysts ◽  
Recent Advances ◽  
Recent Developments

The present review article highlights the preparation, characterization, properties, and recent developments in porous metal oxide catalysts for heterogeneous catalysis.

scholarly journals Template free mild hydrothermal synthesis of core–shell Cu2O(Cu)@CuO visible light photocatalysts for N-acetyl-para-aminophenol degradation

2019 ◽  
Vol 7 (36) ◽  
pp. 20767-20777 ◽  
Author(s):  
Sekar Karthikeyan ◽  
Chitiphon Chuaicham ◽  
Radheshyam R. Pawar ◽  
Keiko Sasaki ◽  
Wei Li ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Visible Light ◽  
Environmental Remediation ◽  
Light Harvesting ◽  
Low Cost ◽  
Core Shell ◽  
Earth Abundant ◽  
Template Free ◽  
Photocatalytic Processes

Solar photocatalytic processes are a promising approach to environmental remediation, however their implementation requires improvements in visible light harvesting and conversion and a focus on low cost, Earth abundant materials.

scholarly journals An Overview on Recent Progress of Metal Oxide/Graphene/CNTs-Based Nanobiosensors

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Ahmet Aykaç ◽  
Hazal Gergeroglu ◽  
Büşra Beşli ◽  
Emine Özge Akkaş ◽  
Ahmet Yavaş ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Textile Industry ◽  
Limit Of Detection ◽  
Low Cost ◽  
Hybrid Structure ◽  
Biologically Active ◽  
Operating Characteristics ◽  
Recognition Element ◽  
Bedside Testing ◽  
Recent Developments

AbstractNanobiosensors are convenient, practical, and sensitive analyzers that detect chemical and biological agents and convert the results into meaningful data between a biologically active molecule and a recognition element immobilized on the surface of the signal transducer by a physicochemical detector. Due to their fast, accurate and reliable operating characteristics, nanobiosensors are widely used in clinical and nonclinical applications, bedside testing, medical textile industry, environmental monitoring, food safety, etc. They play an important role in such critical applications. Therefore, the design of the biosensing interface is essential in determining the performance of the nanobiosensor. The unique chemical and physical properties of nanomaterials have paved the way for new and improved sensing devices in biosensors. The growing demand for devices with improved sensing and selectivity capability, short response time, lower limit of detection, and low cost causes novel investigations on nanobiomaterials to be used as biosensor scaffolds. Among all other nanomaterials, studies on developing nanobiosensors based on metal oxide nanostructures, graphene and its derivatives, carbon nanotubes, and the widespread use of these nanomaterials as a hybrid structure have recently attracted attention. Nanohybrid structures created by combining these nanostructures will directly meet the future biosensors’ needs with their high electrocatalytic activities. This review addressed the recent developments on these nanomaterials and their derivatives, and their use as biosensor scaffolds. We reviewed these popular nanomaterials by evaluating them with comparative studies, tables, and charts.

Earth-abundant stable elemental semiconductor red phosphorus-based hybrids for environmental remediation and energy storage applications

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44616-44629 ◽  
Author(s):  
Sajid Ali Ansari ◽  
Ziyauddin Khan ◽  
Mohammad Omaish Ansari ◽  
Moo Hwan Cho
Keyword(s):  
Energy Storage ◽  
Visible Light ◽  
Environmental Remediation ◽  
Organic Dyes ◽  
Low Cost ◽  
Environmentally Friendly ◽  
Solar Light ◽  
Red Phosphorus ◽  
Earth Abundant ◽  
Energy Storage Applications

The photocatalytic generation of hydrogen and the photodegradation of organic dyes in wastewater using solar light, preferably visible light, have attracted considerable interest because they are clean, low-cost, and environmentally friendly processes.

Nanostructured Metal Oxides as Cathode Interfacial Layers for Hybrid-Polymer Electronic Devices

2010 ◽  
Vol 75 ◽  
pp. 74-78
Author(s):  
Maria Vasilopoulou ◽  
Leonidas C. Palilis ◽  
Dimitra G. Georgiadou ◽  
Panagiotis Argitis ◽  
Ioannis Kostis ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Electronic Devices ◽  
Cell Performance ◽  
The Other ◽  
Device Performance ◽  
Hybrid Polymer ◽  
Interfacial Layers ◽  
Nanostructured Metal Oxides ◽  
Nanostructured Metal

We report the use of nanostructured metal oxides as cathode interfacial layers for improved performance hybrid polymer electronic devices such as light-emitting diodes (PLEDs) and solar cells. In particular, we employ a stoichiometric (WO3) and a partially reduced tungsten metal oxide (WOx) (x<3), both deposited as very thin layers between an aluminum (Al) cathode and the active polymer layer in hybrid PLEDs and achieve improved PLED device performance reflected as an increase in the current density and luminance and a reduction of the operating voltage. On the other hand, we investigate the use of a stoichiometric tungsten oxide layer as a thin cathode interfacial layer in hybrid polymer photovoltaic cells (Hy-PVs). We demonstrate improved photovoltaic cell performance, primarily as a result of the substantial increase in the short-circuit photocurrent. The improved PLED device characteristics are attributed to enhanced electron injection that primarily results from the lowering of the effective interfacial barrier, as evidenced by photovoltaic open circuit voltage measurements, and improved electron transfer. On the other hand, the observed improvement in the hybrid solar cell performance is primarily attributed to its enhanced internal quantum efficiency, most likely due to the improved electron transport and extraction at the active layer/WO3/Al interface and the reduction of the corresponding contact series resistance. Correlation between the metal oxide surface morphology and the device performance is also investigated and will be discussed.

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