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Article ; Online: Structural Investigation of the Synthesized Few-Layer Graphene from Coal under Microwave

Faridul Islam / Arash Tahmasebi / Behdad Moghtaderi / Jianglong Yu

Nanomaterials, Vol 12, Iss 57, p

2022 Volume 57

Abstract: This study focused on the structural investigation of few-layer graphene (FLG) synthesis from bituminous coal through a catalytic process under microwave heat treatment (MW). The produced FLG has been examined by Raman spectroscopy, XRD, TEM, and AFM. ... ...

Abstract	This study focused on the structural investigation of few-layer graphene (FLG) synthesis from bituminous coal through a catalytic process under microwave heat treatment (MW). The produced FLG has been examined by Raman spectroscopy, XRD, TEM, and AFM. Coal was activated using the potassium hydroxide activation process. The FLG synthesis processing duration was much faster requiring only 20 min under the microwave radiation. To analyse few-layer graphene samples, we considered the three bands, i.e., D, G, and 2D, of Raman spectra. At 1300 °C, the P10% Fe sample resulted in fewer defects than the other catalyst percentages sample. The catalyst percentages affected the structural change of the FLG composite materials. In addition, the Raman mapping showed that the catalyst loaded sample was homogeneously distributed and indicated a few-layer graphene sheet. In addition, the AFM technique measured the FLG thickness around 4.5 nm. Furthermore, the HRTEM images of the P10% Fe sample contained a unique morphology with 2–7 graphitic layers of graphene thin sheets. This research reported the structural revolution with latent feasibility of FLG synthesis from bituminous coal in a wide range.
Keywords	few-layer graphene ; coal ; Raman spectroscopy ; catalyst ; microwave ; Chemistry ; QD1-999
Subject code	530
Language	English
Publishing date	2022-12-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Synthesis of Super-Long Carbon Nanotubes from Cellulosic Biomass under Microwave Radiation

Joy Esohe Omoriyekomwan / Arash Tahmasebi / Jian Zhang / Jianglong Yu

Nanomaterials, Vol 12, Iss 737, p

2022 Volume 737

Abstract: This study reports a novel method for synthesizing super-long carbon nanotubes (SL-CNTs) from cellulose via a microwave treatment process without an external catalyst. CNTs with a length of 0.7–2 mm were obtained via microwave treatment of cellulose ... ...

Abstract	This study reports a novel method for synthesizing super-long carbon nanotubes (SL-CNTs) from cellulose via a microwave treatment process without an external catalyst. CNTs with a length of 0.7–2 mm were obtained via microwave treatment of cellulose biochar temperatures of 1200–1400 °C. Scanning electron microscope (SEM), together with high-resolution transmission electron microscope (HRTEM) results, were used to investigate the changes in the length and morphology of CNTs with respect to treatment temperature. The morphology of CNTs changed from twisted, curved, and threadlike to straight structures. The average length of CNTs after microwave pyrolysis at 600 °C was approximately 600–1800 nm, which after microwave treatment at 1300 °C and 1400 °C increased to about 1–2 mm. X-ray diffractometer (XRD) results confirmed the crystalline structure of CNTs with two prominent peaks at 2θ = 26.3° and 2θ = 43.2° correlating with the graphite (002) and (100) reflections. The I D /I G ratio obtained from Raman spectra of the CNTs decreased to the lowest value of 0.84 after microwave treatment at 1400 °C, implying a high degree of carbon order. The presence of Fe and trace amounts of other elements were confirmed by the energy-dispersive X-ray spectrometer (EDS) and were postulated to have catalyzed the growth of CNTs. The mechanism of the SL-CNTs growth under microwave treatment was proposed and discussed.
Keywords	super-long carbon nanotubes ; microwave radiation ; carbon materials ; Chemistry ; QD1-999
Language	English
Publishing date	2022-02-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Structure of Coal-Derived Metal-Supported Few-Layer Graphene Composite Materials Synthesized Using a Microwave-Assisted Catalytic Graphitization Process

Faridul Islam / Arash Tahmasebi / Rou Wang / Jianglong Yu

Nanomaterials, Vol 11, Iss 1672, p

2021 Volume 1672

Abstract: Metal-supported few-layer graphene (FLG) was synthesized via microwave-assisted catalytic graphitization owing to the increasing demand for it and its wide applications. In this study, we quickly converted earth-abundant and low-cost bituminous coal to ... ...

Abstract	Metal-supported few-layer graphene (FLG) was synthesized via microwave-assisted catalytic graphitization owing to the increasing demand for it and its wide applications. In this study, we quickly converted earth-abundant and low-cost bituminous coal to FLG over Fe catalysts at a temperature of 1300 °C. X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and N 2 adsorption–desorption experiments were performed to analyze the fabricated metal-supported FLG. The results indicated that the microwave-irradiation temperature at a set holding-time played a critical role in the synthesis of metal-supported FLG. The highest degree of graphitization and a well-developed pore structure were fabricated at 1300 °C using a S10% Fe catalyst for 20 min. High-resolution transmission electron microscopy analysis confirmed that the metal-supported FLG fabricated via microwave-assisted catalytic graphitization consisted of 3–6 layers of graphene nanosheets. In addition, the 2D band at 2700 cm −1 in the Raman spectrum of the fabricated metal-supported FLG samples were observed, which indicated the presence of few-layer graphene structure. Furthermore, a mechanism was proposed for the microwave-assisted catalytic graphitization of bituminous coal. Here, we developed a cost-effective and environmental friendly metal-supported FLG method using a coal-based carbonaceous material.
Keywords	few-layer graphene ; catalytic graphitization ; microwave irradiation ; iron oxide ; Chemistry ; QD1-999
Subject code	669
Language	English
Publishing date	2021-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Ice nucleation of water droplet containing solid particles under weak ultrasonic vibration

Shaolei Gai / Zhengbiao Peng / Behdad Moghtaderi / Jianglong Yu / Elham Doroodchi

Ultrasonics Sonochemistry, Vol 70, Iss , Pp 105301- (2021)

2021

Abstract: Water with small volume (a few microlitres or less) often maintains its liquid state even at temperatures much lower than 0 °C. In this study, we examine the onset of ice nucleation in micro-sized water droplets with immersed solid particles under weak ... ...

Abstract	Water with small volume (a few microlitres or less) often maintains its liquid state even at temperatures much lower than 0 °C. In this study, we examine the onset of ice nucleation in micro-sized water droplets with immersed solid particles under weak ultrasonic vibrations. The experimental results show that ice nucleation inside the water droplets can be successfully induced at relatively high temperatures. The experimental observations indicate that the nucleation sites are commonly encountered in the region between the particle and the substrate. A numerical study is conducted to gain insight into the possible underlying phenomenon for ice nucleation in such systems. The simulation results show that the collapse of cavitation bubbles in the crevice at the particle surface is structure sensitive with the hemisphere-shape crevice generating pressures as high as 1.63 GPa, which is theoretically suitable for inducing ice nucleation.
Keywords	Micro-sized water droplet ; Ice nucleation ; Ultrasonic vibration ; Cavitation bubble ; LBM ; Chemistry ; QD1-999 ; Acoustics. Sound ; QC221-246
Subject code	290
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Functional Carbon from Nature

Hongzhe He / Ruoqun Zhang / Pengcheng Zhang / Ping Wang / Ning Chen / Binbin Qian / Lian Zhang / Jianglong Yu / Baiqian Dai

Advanced Science, Vol 10, Iss 16, Pp n/a-n/a (2023)

Biomass‐Derived Carbon Materials and the Recent Progress of Their Applications

2023

Abstract: Abstract Biomass is considered as a promising source to fabricate functional carbon materials for its sustainability, low cost, and high carbon content. Biomass‐derived‐carbon materials (BCMs) have been a thriving research field. Novel structures, ... ...

Abstract	Abstract Biomass is considered as a promising source to fabricate functional carbon materials for its sustainability, low cost, and high carbon content. Biomass‐derived‐carbon materials (BCMs) have been a thriving research field. Novel structures, diverse synthesis methods, and versatile applications of BCMs have been reported. However, there has been no recent review of the numerous studies of different aspects of BCMs‐related research. Therefore, this paper presents a comprehensive review that summarizes the progress of BCMs related research. Herein, typical types of biomass used to prepare BCMs are introduced. Variable structures of BCMs are summarized as the performance and properties of BCMs are closely related to their structures. Representative synthesis strategies, including both their merits and drawbacks are reviewed comprehensively. Moreover, the influence of synthetic conditions on the structure of as‐prepared carbon products is discussed, providing important information for the rational design of the fabrication process of BCMs. Recent progress in versatile applications of BCMs based on their morphologies and physicochemical properties is reported. Finally, the remaining challenges of BCMs, are highlighted. Overall, this review provides a valuable overview of current knowledge and recent progress of BCMs, and it outlines directions for future research development of BCMs.
Keywords	biomass‐derived carbon materials ; electrocatalysts ; environmental applications ; functional carbon materials ; machine learning methods ; Science ; Q
Language	English
Publishing date	2023-06-01T00:00:00Z
Publisher	Wiley
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Mechanistic Study on the Removal of NO2 from Flue Gas Using Novel Ethylene Glycol-tetrabutylammonium Bromide Deep Eutectic Solvents

Jinxiao Dou / Yongqi Zhao / Hua Li / Jieping Wang / Arash Tahmasebi / Jianglong Yu

ACS Omega, Vol 5, Iss 48, Pp 31220-

2020 Volume 31226

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2020-11-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A Study on Mn-Fe Catalysts Supported on Coal Fly Ash for Low-Temperature Selective Catalytic Reduction of NO X in Flue Gas

Xiaoxu Duan / Jinxiao Dou / Yongqi Zhao / Salman Khoshk Rish / Jianglong Yu

Catalysts, Vol 10, Iss 1399, p

2020 Volume 1399

Abstract: A series of Mn 0.15 Fe 0.05 /fly-ash catalysts have been synthesized by the co-precipitation method using coal fly ash (FA) as the catalyst carrier. The catalyst showed high catalytic activity for low-temperature selective catalytic reduction (LTSCR) of ... ...

Abstract	A series of Mn 0.15 Fe 0.05 /fly-ash catalysts have been synthesized by the co-precipitation method using coal fly ash (FA) as the catalyst carrier. The catalyst showed high catalytic activity for low-temperature selective catalytic reduction (LTSCR) of NO with NH 3 . The catalytic reaction experiments were carried out using a lab-scale fixed-bed reactor. De-NO x experimental results showed the use of optimum weight ratio of Mn/FA and Fe/FA, resulted in high NH 3 -SCR (selective catalytic reduction) activity with a broad operating temperature range (130–300 °C) under 50000 h −1 . Various characterization methods were used to understand the role of the physicochemical structure of the synthesized catalysts on their De-NO x capability. The scanning electron microscopy, physical adsorption-desorption, and X-ray photoelectron spectroscopy showed the interaction among the MnO x , FeO x , and the substrate increased the surface area, the amount of high valence metal state (Mn 4+ , Mn 3+ , and Fe 3+ ), and the surface adsorbed oxygen. Hence, redox cycles (Fe 3+ + Mn 2+ ↔ Mn 3+ + Fe 2+ Fe 2+ + Mn 4+ ↔ Mn 3+ + Fe 3+ ) were co-promoted over the catalyst. The balance between the adsorption ability of the reactants and the redox ability can promote the excellent NO x conversion ability of the catalyst at low temperatures. Furthermore, NH 3 /NO temperature-programmed desorption, NH 3 /NO- thermo gravimetric-mass spectrometry (NH 3 /NO-TG-MS), and in-situ DRIFTs (Diffuse Reflectance Infrared Fourier Transform Spectroscopy) results showed the Mn 0.15 Fe 0.05 /FA has relatively high adsorption capacity and activation capability of reactants (NO, O 2 , and NH 3 ) at low temperatures. These results also showed that the Langmuir–Hinshelwood (L–H) reaction mechanism is the main reaction mechanism through which NH 3 -SCR reactions took place. This work is important for synthesizing an efficient and environmentally-friendly catalyst and demonstrates a promising waste-utilization strategy.
Keywords	coal fly ash ; Mn 0.15 Fe 0.05 /FA catalysts ; low-temperature SCR ; De-NO x efficiency ; co-impregnation method ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
Subject code	333 ; 290
Language	English
Publishing date	2020-11-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Desulfurization Performance and Kinetics of Potassium Hydroxide-Impregnated Char Sorbents for SO2 Removal from Simulated Flue Gas

Jinxiao Dou / Yongqi Zhao / Xiaoxu Duan / Hongning Chai / Lichun Li / Jianglong Yu

ACS Omega, Vol 5, Iss 30, Pp 19194-

2020 Volume 19201

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2020-07-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Hypoxia-reprogramed megamitochondrion contacts and engulfs lysosome to mediate mitochondrial self-digestion

Tianshu Hao / Jianglong Yu / Zhida Wu / Jie Jiang / Longlong Gong / Bingjun Wang / Hanze Guo / Huabin Zhao / Bin Lu / Simone Engelender / He He / Zhiyin Song

Nature Communications, Vol 14, Iss 1, Pp 1-

2023 Volume 17

Abstract: Abstract Mitochondria are the key organelles for sensing oxygen, which is consumed by oxidative phosphorylation to generate ATP. Lysosomes contain hydrolytic enzymes that degrade misfolded proteins and damaged organelles to maintain cellular homeostasis. ...

Abstract	Abstract Mitochondria are the key organelles for sensing oxygen, which is consumed by oxidative phosphorylation to generate ATP. Lysosomes contain hydrolytic enzymes that degrade misfolded proteins and damaged organelles to maintain cellular homeostasis. Mitochondria physically and functionally interact with lysosomes to regulate cellular metabolism. However, the mode and biological functions of mitochondria-lysosome communication remain largely unknown. Here, we show that hypoxia remodels normal tubular mitochondria into megamitochondria by inducing broad inter-mitochondria contacts and subsequent fusion. Importantly, under hypoxia, mitochondria-lysosome contacts are promoted, and certain lysosomes are engulfed by megamitochondria, in a process we term megamitochondria engulfing lysosome (MMEL). Both megamitochondria and mature lysosomes are required for MMEL. Moreover, the STX17-SNAP29-VAMP7 complex contributes to mitochondria-lysosome contacts and MMEL under hypoxia. Intriguingly, MMEL mediates a mode of mitochondrial degradation, which we termed mitochondrial self-digestion (MSD). Moreover, MSD increases mitochondrial ROS production. Our results reveal a mode of crosstalk between mitochondria and lysosomes and uncover an additional pathway for mitochondrial degradation.
Keywords	Science ; Q
Subject code	610
Language	English
Publishing date	2023-07-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Pressurized entrained-flow pyrolysis of microalgae: Enhanced production of hydrogen and nitrogen-containing compounds

Maliutina, Kristina / Arash Tahmasebi / Jianglong Yu

Bioresource technology. 2018 May, v. 256

2018

Abstract: Pressurized entrained-flow pyrolysis of Chlorella vulgaris microalgae was investigated. The impact of pressure on the yield and composition of pyrolysis products were studied. The results showed that the concentration of H2 in bio-gas increased sharply ... ...

Abstract	Pressurized entrained-flow pyrolysis of Chlorella vulgaris microalgae was investigated. The impact of pressure on the yield and composition of pyrolysis products were studied. The results showed that the concentration of H2 in bio-gas increased sharply with increasing pyrolysis pressure, while those of CO, CO2, CH4, and C2H6 were dramatically decreased. The concentration of H2 reached 88.01 vol% in bio-gas at 900 °C and 4 MPa. Higher pressures promoted the hydrogen transfer to bio-gas. The bio-oils derived from pressurized pyrolysis were rich in nitrogen-containing compounds and PAHs. The highest concentration of nitrogen-containing compounds in bio-oil was achieved at 800 °C and 1 MPa. Increasing pyrolysis pressure promoted the formation of nitrogen-containing compounds such as indole, quinoline, isoquinoline and phenanthridine. Higher pyrolysis pressures led to increased sphericity, enhanced swelling, and higher carbon order of bio-chars. Pressurized pyrolysis of biomass has a great potential for poly-generation of H2, nitrogen containing compounds and bio-char.
Keywords	Chlorella vulgaris ; biochar ; biogas ; biomass ; carbon ; carbon dioxide ; carbon monoxide ; ethane ; hydrogen ; methane ; microalgae ; nitrogen ; polycyclic aromatic hydrocarbons ; pyrolysis ; quinoline
Language	English
Dates of publication	2018-05
Size	p. 160-169.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2018.02.016
Database	NAL-Catalogue (AGRICOLA)

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