scholarly journals Potentiality of Graphene Oxide and Polyoxometalate as Radionuclides Adsorbent to Restore the Environment after Fukushima Disaster: A Mini Review

2021 ◽  
Vol 21 (3) ◽  
pp. 776
Author(s):  
Bangun Satrio Nugroho ◽  
Muh Nur Khoiru Wihadi ◽  
Fabian Grote ◽  
Siegfried Eigler ◽  
Satoru Nakashima
Keyword(s):  
Graphene Oxide ◽  
Ion Trapping ◽  
Future Research ◽  
Impregnation Method ◽  
Promising Candidate ◽  
Similar Materials ◽  
Multiple Oxidations ◽  
Radionuclides Removal ◽  
Fukushima Disaster ◽  
Cation Charge

This paper discusses the promising candidate of excellent materials, graphene oxide (GO) and polyoxometalates (POMs), for radionuclide adsorbent. In this perspective, the unique properties of GO and POMs make them ideal candidates for developing new composites having the ability to adsorb radionuclides, and several essential things are reviewed. First, the anchoring mechanism to deposit POM on the GO surface area by (i) carboxylation method, (ii) covalent bonding, and (iii) impregnation method. Second, the radionuclides removal mechanism is described in several systems: (i) coagulation, (ii) electrostatic interaction, (iii) ion trapping, and (iv) H+-exchange. Third, the experimental condition that employed to enlarge the sorption capacity such as (i) pH adjustment, (ii) employing multiple oxidations, and (iii) cation charge. A thorough understanding of the POM-anchored GO material can pave the way for future research on similar materials. It can also help in understanding the nature of the interactive collaboration present between GO and POM.

scholarly journals A highly sensitive biosensor based on methacrylated graphene oxide-grafted polyaniline for ascorbic acid determination

2020 ◽  
Vol 9 (1) ◽  
pp. 760-767 ◽  
Author(s):  
Seyed Morteza Naghib ◽  
Farahnaz Behzad ◽  
Mehdi Rahmanian ◽  
Yasser Zare ◽  
Kyong Yop Rhee
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Current Response ◽  
Functionalized Graphene ◽  
Serum Samples ◽  
Promising Candidate ◽  
Graphene Nanocomposites ◽  
Selective Determination ◽  
Highly Sensitive

AbstractFunctionalized graphene-based nanocomposites have opened new windows to address some challenges for increasing the sensitivity, accuracy and functionality of biosensors. Polyaniline (PANI) is one of the most potentially promising and technologically important conducting polymers, which brings together the electrical features of metals with intriguing properties of plastics including facile processing and controllable chemical and physical properties. PANI/graphene nanocomposites have attracted intense interest in various fields due to unique physicochemical properties including high conductivity, facile preparation and intriguing redox behavior. In this article, a functionalized graphene-grafted nanostructured PANI nanocomposite was applied for determining the ascorbic acid (AA) level. A significant current response was observed after treating the electrode surface with methacrylated graphene oxide (MeGO)/PANI nanocomposite. The amperometric responses showed a robust linear range of 8–5,000 µM and detection limit of 2 µM (N = 5). Excellent sensor selectivity was demonstrated in the presence of electroactive components interfering species, commonly found in real serum samples. This sensor is a promising candidate for rapid and selective determination of AA.

High effective enrichment of U(vi) from aqueous solutions on versatile crystalline carbohydrate polymer-functionalized graphene oxide

2021 ◽  
Vol 50 (39) ◽  
pp. 14009-14017
Author(s):  
Hai Wang ◽  
Renrong Liu ◽  
Huifang Wang ◽  
Baowei Hu ◽  
Muqing Qiu
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Aqueous Solutions ◽  
Functional Groups ◽  
Void Ratio ◽  
Functionalized Graphene ◽  
Promising Candidate ◽  
Functionalized Graphene Oxide ◽  
Carbohydrate Polymer ◽  
Environmental Decontamination

The highly effective enrichment of U(vi) on COF/GO was attributed to a huge void ratio and a variety of oxygen-containing functional groups. It could be used as a promising candidate for environmental decontamination and energy storage.

A retrospective on MXene-based composites for solar fuel production

2020 ◽  
Vol 92 (12) ◽  
pp. 1953-1969
Author(s):  
Yisong Zhu ◽  
Zhenjun Wu ◽  
Xiuqiang Xie ◽  
Nan Zhang
Keyword(s):  
Artificial Photosynthesis ◽  
Future Research ◽  
Solar Fuel ◽  
Fuel Production ◽  
Promising Candidate ◽  
Research Directions ◽  
Composite Photocatalysts ◽  
Future Research Directions ◽  
General Synthesis ◽  
Photocatalytic Applications

AbstractMXene with two-dimensional layered structure and desirable electronic properties has emerged as a promising candidate to construct MXene-based composites towards various photocatalytic applications. As compared to the downhill-type photodegradation reactions, artificial photosynthesis often involves thermodynamic uphill reactions with a large positive change in Gibbs free energy. Recent years have witnessed the effectiveness of MXene in enhancing the photoactivity of MXene-based composites for solar fuel synthesis. In this review, we mainly focus on the applications of MXene-based composites for photocatalytic solar fuel production. We will start from summarizing the general synthesis of MXene-based composite photocatalysts. Then the recent progress on MXene-based composite photocatalysts for solar fuel synthesis, including water splitting for H2 production, CO2 reduction to solar fuels, and N2 fixation for NH3 synthesis is elucidated. The roles of MXene playing in improving the photoactivity of MXene-based composites in these applications have also been discussed. In the last section, perspectives on the future research directions of MXene-based composites towards the applications of artificial photosynthesis are presented.

Improving Zr0.5Hf0.5O2-based charge-trapped performance by graphene oxide quantum dots

2019 ◽  
Vol 12 (01) ◽  
pp. 1850093 ◽  
Author(s):  
Hong Wang ◽  
Bangfu Ding ◽  
Xiaoyan Tian ◽  
Rui Zhao ◽  
Yuanyuan Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Charge Trapping ◽  
Memory Device ◽  
Wide Bandgap ◽  
Photoelectron Spectra ◽  
Promising Candidate ◽  
New Type ◽  
Charge Trapping Memory ◽  
Graphene Oxide Quantum Dots

In this work, graphene oxide quantum dots (GOQDs) are introduced as an electron-trapped layer in Pd/Zr[Formula: see text]Hf[Formula: see text]O2 (ZHO)/SiO2/Si memory device. This structure possessed longer than 104 s retention capability, a low operation voltage around [Formula: see text][Formula: see text]V and 2.61[Formula: see text]V storage windows. GOQDs contained carbon–carbon and carbon–oxygen single/double bonds based on the analysis of C-1[Formula: see text] and O-1[Formula: see text] X-ray photoelectron spectra. It is proposed that the GOQDs’ wide bandgap with many oxygen-containing functional groups favors charge capture to a greater extent. This new type of charge-trapping memory can be a promising candidate for wide application to storing information with non-volatility in the big data era.

scholarly journals GRAPHENE OXIDE MICROCAPSULES (GOMs) WITH LINSEED OIL CORE VIA PICKERING EMULSION METHOD: EFFECT OF DISPERSE SPEED

2021 ◽  
Vol 22 (1) ◽  
pp. 213-222
Author(s):  
Nurul Nadiah Sahir ◽  
Noor Azlina Hassan ◽  
Norita Binti Hassan ◽  
Norhasnidawani Binti Johari
Keyword(s):  
Graphene Oxide ◽  
Phase Separation ◽  
Linseed Oil ◽  
Pickering Emulsion ◽  
Optical Microscope ◽  
Coating System ◽  
Self Healing ◽  
Promising Candidate ◽  
Emulsion Method ◽  
Method Effect

Graphene oxide microcapsules (GOMs) have been prepared through Pickering emulsion method by varying the disperse speed to study its effect on the GOM’s size. The GOMs were characterized through phase separation observation, polarized optical microscope (POM), and particle size analyser (PSA). Phase separation observation showed more viscous and cloudy emulsion was produced when the disperse speed was increased. After 24 hours, only 800 rpm emulsion did not show any phase separation. POM characterization depicted that increasing the emulsification energy led to the finer emulsion with the 1200 rpm sample showing the smallest microcapsule size of around 8 ?m. However, PSA analysis suggested that although the disperse speed controls the GOMs size, the amount of GO in the emulsion plays an important role for the microcapsule to maintain its stability. Emulsion produced at 800 rpm possesses satisfactory stability with GOMs diameter of 11.15 ?m. The result also suggested that graphene oxide encapsulated linseed oil may act as a promising candidate for healing microcapsules in a self-healing coating system. ABSTRAK: Mikrokapsul graphene oksida (GOMs) telah dihasilkan melalui kaedah emulsifikasi Pickering dengan memvariasikan tenaga pengemulsi untuk mengkaji kesannya terhadap saiz GOMs. GOMs dicirikan melalui pemerhatian pemisahan fasa, mikroskop optik polarisasi (POM) dan penganalisis saiz zarah (PSA). Pemerhatian pemisahan fasa menunjukkan emulsi yang lebih likat dan keruh dihasilkan apabila kelajuan pengemulsi meningkat. Selepas 24 jam, hanya emulsi 800 rpm tidak menunjukkan pemisahan fasa. Pencirian POM meunjukkan bahawa peningkatan tenaga pengemulsi menghasilkan emulsi yang lebih halus dengan sampel 1200 rpm menunjukkan saiz mikrokapsul terkecil, sekitar 8 ?m. Walau bagaimanapun, analisis PSA mencadangkan bahawa walaupun kelajuan pengemulsi mengawal saiz GOMs, jumlah GO dalam emulsi memainkan peranan penting untuk mengekalkan kestabilan mikrokapsul. Emulsi yang dihasilkan pada 800 rpm mempunyai kestabilan yang memuaskan dengan purata saiz GOMs sekitar 11.15 ?m. Berdasarkan dapatan kajian, graphene oksida yang terkandung minyak biji rami boleh menjadi salah satu mikrokapsul penyembuh dalam sistem cat auto-sembuh.

scholarly journals Research Progress of Graphene-Based Flexible Humidity Sensor

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5601
Author(s):  
Rongxuan Liang ◽  
Ansheng Luo ◽  
Zhenbang Zhang ◽  
Zhantong Li ◽  
Chongyang Han ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lattice Structure ◽  
Research Progress ◽  
Dimensional Structure ◽  
Future Research ◽  
Humidity Sensors ◽  
Human Respiration ◽  
New Type ◽  
Working Principle ◽  
Moisture Sensitive

Graphene is a new type of carbon material with a flexible, two-dimensional structure. Due to the excellent stability of its lattice structure and its mechanical flexibility, graphene-based materials can be applied in flexible humidity sensors. At present, the application of graphene-based flexible humidity sensors in the fields of medical care and environmental monitoring is attracting widespread attention. In this review, the basic properties of graphene oxide (GO) and reduced graphene oxide (rGO) as moisture-sensitive materials and methods for their preparation were introduced. Moreover, three methods for improving the performance of moisture-sensitive materials were discussed. The working principle of different types of graphene-based humidity sensors were introduced. The progress in the research on graphene-based flexible humidity sensors in four respects: Human respiration, skin moisture, human sweat, and environmental humidity were discussed. Finally, the future research, following the development trends and challenges, to develop the potential of integrated, graphene-based flexible humidity sensors were discussed.

scholarly journals A Membrane Modified with Nitrogen-Doped TiO2/Graphene Oxide for Improved Photocatalytic Performance

2019 ◽  
Vol 9 (5) ◽  
pp. 855
Author(s):  
Tingting Li ◽  
Yong Gao ◽  
Junwo Zhou ◽  
Manying Zhang ◽  
Xiaofei Fu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Polyvinylidene Fluoride ◽  
Membrane Surface ◽  
Pure Water ◽  
Impregnation Method ◽  
Photocatalytic Efficiency ◽  
Pvdf Membrane ◽  
Microfiltration Membrane ◽  
Doped Tio2 ◽  
Nitrogen Doped

An improved photocatalytic microfiltration membrane was successfully prepared by the impregnation method with nitrogen-doped TiO2/graphene oxide (GO) (NTG). By utilizing the unique role of N and GO, the photocatalytic activity of the membrane in UV and sunlight was improved. Compared with the Polyvinylidene Fluoride (PVDF) microfiltration membrane which was modified by TiO2, N-TiO2 (NT) and TiO2-GO (TG), the NTG/PVDF membrane exhibited high photocatalytic efficiency and significantly improved photodegradation power to the methylene blue (MB) solution under ultraviolet light and sunlight, with the photocatalytic efficiency reaching 86.5% and 80.6%, respectively. Scanning electron microscopy (SEM), X-ray diffractometry (XRD) and Fourier transform infrared spectroscopy (FT-IR) were used to analyze the morphology, crystal structure and chemical bonds of the membrane surface. The hydrophilicity of the modified PVDF microfiltration membrane was significantly improved, the flux of the pure water membrane reached 1672 Lm−2h−1, the flux of the MB solution was also significantly improved due to photodegradation. Therefore, the nitrogen-doped titanium dioxide graphene oxide PVDF microfiltration membrane (NTG/PVDF membrane) has great development prospects in sustainable water treatment.

scholarly journals A New Broadband and Strong Absorption Performance FeCO3/RGO Microwave Absorption Nanocomposites

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2206 ◽  
Author(s):  
Wei Huang ◽  
Shicheng Wei ◽  
Yujiang Wang ◽  
Bo Wang ◽  
Yi Liang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
Solvothermal Method ◽  
Impedance Matching ◽  
Effective Bandwidth ◽  
Broad Absorption ◽  
Promising Candidate ◽  
Reduced Graphene ◽  
Absorption Performance

A novel composite of FeCO3 nanoparticles, which are wrapped with reduced graphene oxide (RGO), is fabricated using a facile one-spot solvothermal method. The composite consists of a substrate of RGO and FeCO3 nanoparticles that are embedded in the RGO layers. The experimental results for the FeCO3/RGO composite reveal a minimum refection loss (−44.5 dB) at 11.9 GHz when the thickness reaches 2.4 mm. The effective bandwidth is 7.9 GHz between 10.1 and 18 GHz when the refection loss was below −10 dB. Compared to GO and RGO, this type of composite shows better microwave absorption thanks to improved impedance matching. Overall, this thin and lightweight FeCO3/RGO composite is a promising candidate for absorbers that require both strong and broad absorption.

scholarly journals Graphene-based membranes: status and prospects

2016 ◽  
Vol 374 (2060) ◽  
pp. 20150024 ◽  
Author(s):  
Hee Wook Yoon ◽  
Young Hoon Cho ◽  
Ho Bum Park
Keyword(s):  
Graphene Oxide ◽  
Basal Plane ◽  
State Of The Art ◽  
Future Research ◽  
Two Dimensional ◽  
Research Directions ◽  
Graphene Layers ◽  
Future Research Directions ◽  
Simulation Results ◽  
Graphene Membranes

Recently, graphene-based membranes have been extensively studied, represented by two distinct research directions: (i) creating pores in graphene basal plane and (ii) engineering nanochannels in graphene layers. Most simulation results predict that porous graphene membranes can be much more selective and permeable than current existing membranes, also evidenced by some experimental results for gas separation and desalination. In addition, graphene oxide has been widely investigated in layered membranes with two-dimensional nanochannels, showing very intriguing separation properties. This review will cover state-of-the-art of graphene-based membranes, and also provide a material guideline on future research directions suitable for practical membrane applications.

scholarly journals Tuning of graphene oxide composition by multiple oxidations for carbon dioxide storage and capture of toxic metals

2017 ◽  
Vol 5 (6) ◽  
pp. 2739-2748 ◽  
Author(s):  
Michal Nováček ◽  
Ondřej Jankovský ◽  
Jan Luxa ◽  
David Sedmidubský ◽  
Martin Pumera ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Graphene Oxide ◽  
Chemical Composition ◽  
Toxic Metals ◽  
Carbon Dioxide Storage ◽  
Oxide Composition ◽  
Multiple Oxidations

The chemical composition and properties of graphene oxide can be controlled by multiple oxidations.

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