No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
and magnetic field during the carbothermic reduction.[6] The high-microwave susceptibility of carbonaceous materials has been exploited for iron oxide reduction using microwave.[6–9] The comparative studies on the microwave-assisted carbothermic reduction between magnetite and hematite ore suggest similar heating behavior and reduction ...
In this brief review, we mainly focus on the microwave-assisted production of reduced graphene oxide in three categories: (1) microwave-assisted chemical reduction of …
The conventional process for CO2 conversion requires high energy and expensive catalysts, and shows poor product selectivity. In this study, we address these challenges by investigating an environmentally friendly method for CO production through the variable frequency microwave-driven CO2 Boudouard reaction over biochar. We hypothesized that tuning the …
In this study, microwave-assisted reduction is carried out to recover iron-enriched concentrate. It is found that red mud is susceptible to microwave exposure and increases its magnetic property considerably. The red mud is microwave reduced in the temperature range of 700–1000 °C for 10–50 min and reductant dosage of 8–12%.
Microwave reduction of GO is an attractive method for larger-scale production, as it is fast and scalable, and allows the reduction and exfoliation steps to be carried out simultaneously.
In this study, reduced graphene oxide (RGO) with a hollow nanostructure was successfully synthesized by layer-by-layer self-assembly using electrostatic interactions and …
Here we report a simple and rapid method to reduce GO into pristine graphene by using 1- to 2-s-long microwave pulses. The microwave-reduced GO (MW-rGO) exhibits …
The main purpose of this work was to extract valuable metals from EAF dust with the addition of biochar, using microwaves to control and optimize the carbothermical reduction process. To achieve better microwave penetration and the most homogeneous electromagnetic heat source distribution possible in a sample, the content of EAF dust and biochar in …
A simple, rapid method to reduce GO into pristine graphene using 1- to 2-second pulses of microwaves is reported using microwave-reduced GO (MW- rGO) as the channel material and into particularly high activity for MW-rGO catalyst support toward oxygen evolution reactions. Efficient exfoliation of graphite in solutions to obtain high-quality graphene flakes is …
the reduction of the oxide. The microwave energy fraction not used in the reduction of the catalyst is reused to supply the heat energy demand of the water splitting reaction.
The enhanced catalysis performance could be ascribed to the surface "knob" with a size of ∼ 17 nm, which accelerated the generation of e – under microwave irradiation, finally promoted the catalytic reduction performance. The microwave catalytic reduction strategy is a hopeful alternative for ultrafast reduction of Cr(VI) in sewage with ...
Water was reduced via reaction with non-equilibrium gadolinium-doped CeO 2 that was previously in situ electrochemically deoxygenated by the sole application of microwaves. …
The route of carbothermal reduction followed by magnetic separation has been proven to be an efficient process to recover valuable metals from spent LIBs. This paper investigated the reductive roasting behaviors of the spent cathode material under microwave-assisted reduction using biochar as the reductant.
Metasurfaces have promised great possibilities in full control of the electromagnetic wavefront by spatially manipulating the phase characteristics across the interface. Here, we report a scheme to realize broadband backward scattering reduction through diffusion-like microwave reflection by utilizing a flexible indium-tin-oxide (ITO)-based ultrathin coding metasurface (less than 0.1 ...
The microwave heating occurs by in-situ heat generation in the mixture, and volumetric heating resulted in a rapid increase in temperature and prevented the generation of a temperature gradient, which reduces the overall reduction duration (Rayapudi and Dhawan, 2019, Samouhos et al., 2013).
The growing demand for high-energy lithium-ion batteries (LIBs) has promoted the production of LiNi x Co y Mn Z O 2 cathode, which results in many spent LIBs to resolve. A novel method that employs microwave carbothermic reduction was used to enhance the leaching of metals from layered LiNi 1/3 Co 1/3 Mn 1/3 O 2 of spent LIBs.The thermodynamic analysis …
The inefficient leaching of manganese is the main factor hindering the commercialization of the reduction process during manganese recovery using pyrite as the reducing agent. Hence, a new method for improving recovery efficiency and reducing the cost is required. This study uses microwave heating as a strengthening method to extract Mn2+ from …
Figure 1 illustrates the schematic of the thermal treatment followed by microwave reduction of GO. Microwave treatment proves to be a highly effective and swift method for reducing GO. Figure 2 shows the XRD pattern of both GO and MrGO. In the XRD pattern of MrGO, there is a pronounced diffraction peak at 2θ = 10.77°, corresponding to the (001) plane, …
A facile method to synthesize rGO using a microwave-assisted method under N 2-atmosphere conditions is reported.Two different reducing agents were used in this research, hydrazine hydrate and L-ascorbic acid (L-AA).The reduction of graphene oxide was completed in 3 minutes by the microwave-assisted method under N 2-atmosphere conditions.The structures …
In addition, the scanning electron microscopy comparison analysis of the samples from microwave reduction and conventional reduction shows that microwave heating could realize the microstructure Ti–Fe separation and reduce the lattice energy of the titanomagnetite concentrate, thus enhancing the reduction process by 7.68% from the perspective ...
We show that the rapid removal of oxygen groups achieved by microwave heating leaves GRA sheets intact. The epoxy groups are most stable within GO. They can rearrange into the …
After the microwave reduction, the oxygen functional groups of the rGO sheets are removed, resulting in higher degree defects on the graphene sheets. Moreover, the removal of oxygen functional groups near to the aromatic graphene are also feasible to reconstruction of C=C bonds in the rGO sheets, which increases the π conjugation of the ...
The mechanism of microwave carbothermal reduction of Sb2O3 was investigated by XRD, SEM-EDS and Mapping analysis, the results show that the microwave reduction process is divided into three stages ...
Microwave reduction is a mild thermal reduction with the lowest efficiency, but the residual oxygen-containing groups increase the hydrophilicity of rGO. To sum up, this work studies that rGO prepared by different reduction methods has different characteristics, which provides a reference for selecting appropriate reduction methods to prepare ...
This study evaluates the carbothermal microwave reduction of low-grade banded hematite jasper iron ore for the preparation of potential feedstock for the alternative iron-making process. The coal sample act as transparent material to microwave irradiation at low temperature, however, above 600 °C, an exponential rise in temperature with a heating rate of ~ 220 °C/min …
Now, researchers have demonstrated low-temperature water splitting to produce hydrogen using microwave catalysis and revealed the important role of reduced oxides in the …
A particularly successful microwave-induced reduction of GO was reported recently (Science, 2016, 353, 1413-1416). We mimic the experiment by reactive molecular dynamics and establish the molecular mechanisms of reduction and their time scales as functions of temperature. We show that the rapid removal of oxygen groups achieved by microwave ...
Rutgers University engineers have found a simple method for producing high-quality graphene that can be used in next-generation electronic and energy devices: bake the …
Therefore, larger sp 2 domains could be restored from GO when using microwave reduction rather than chemical reduction [39,40,41,42]. Open in a separate window. Figure 7. The Raman spectra of GO, RGO, and MRGO-HS. The XPS analysis was used to examine the chemical composition before and after the reduction of the synthesized samples. The ...
In this study, microwave-assisted reduction is carried out to recover iron-enriched concentrate. It is found that red mud is susceptible to microwave exposure and increases its magnetic property considerably. The red mud is microwave reduced in the temperature range of 700–1000 °C for 10–50 min and reductant dosage of 8–12%.
