INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Yuehui Liu,Xiaobo Shi,Xuguang Liu,Xia Li
Nanocomposites of C–Ta 4+ co-doped NaTaO 3 and reduced graphene oxide (C-NTO/rGO) with highly efficient photocatalytic activity were fabricated by a one-step solvothermal reaction. The optimum composites C-NTO/3rGO (with 3 wt% rGO) exhibited superior photocatalytic activity for the degradation of RhB over a mono-component counterpart under visible light irradiation . The photocatalytic efficiency was found to be as high as 97% for 90 min. Both XRD and XPS characterizations indicated that the doping of carbon into the NaTaO 3 lattice leads to the reduction of Ta 5+ to Ta 4+ . Furthermore, the co-doping significantly narrows the band gap (about 2.8 eV). Photo-luminescence (PL), time resolved transient PL decay spectra and photo-current results confirmed that photo-induced hole-electron pairs can be effectively separated resulting from the introduction of rGO. The synergistic effect of a decreased band gap and highly effective separation of photo-generated electrons and holes may be responsible for the enhanced photocatalytic activity of the fabricated nanocomposites. Both h + and •OH active radicals were found to be the key factors for the photo-decomposition process of RhB over the nanocomposites, while •O 2 − was also involved to a smaller extent. A possible photo-degradation mechanism for C-NTO/rGO was proposed on the basis of the experiments results.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Moumita Maiti,Manas Sarkar,Soumen Maiti,Donghong Liu
This work explores noble metal coupled carbon-based nanohybrid materials specifically for their antibacterial and photo-disinfection capabilities from a broader perspective of health to clean. Using gold (Au) nanoparticles (NPs) on the surface of two different shaped zinc oxide-graphene (ZnO-rGO) nanohybrids such as flake and spherical, this experiment aims to manage a pathogen-free environment while filtering and recycling carcinogenic dye-containing wastewater. The shape-tailored ZnO-rGO-Au hybrid generate a substantial amount of reactive oxygen species ; ROSs: hydroxyl radical (•OH), superoxide (•O 2 - ), singlet oxygen, and ( 1 O 2 ) and focal electrostatic interactions on (gram-negative Escherichia coli and gram-positive Staphylococcus aureus ) bacterial cell membranes . Redox cycling and strong potential binding tendency rapture the structural organization of cells that is clearly reflected in growth kinetics, (3(4, 5-dimethylthiazol-2-yl)−2), 5-diphenyl tetrazolium bromide (MTT), inner permeable/ protein/ malondialdehyde assay, and microscopical images after the morphology dependent physical as well as the chemical effects of nanocomposites . The minimum bactericidal concentration (MBC) or minimum inhibitory concentration (MIC) studies show the Au/rGO-ZnO system to be the very potent antibacterial agent , and that only 0.18 mg/ml represents significant bactericidal activity while their toxicity towards mammalian cells is very low (>2 mg/ml). Furthermore, Au NPs alter the bandgap energy of Au/rGO-ZnO hybrids, causing the formation of ROSs at different pH levels or dosages of the catalyst, which results in excellent photocatalytic activity (96% degradation of Rhodamine B when using 0.75 mg catalyst). Based on a Pseudo-first-order kinetic model , a likely mechanistic pathway towards exceptional dye decomposition has also been identified.
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高影响因子
MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Chenxi Wang,Pengcheng Zhao,Li Zhang,Yilin Wang,Qian Fu,Rongjie Li,Jiaodi Li,Chunyan Li,Yixi Xie,Junjie Fei
In this paper, a temperature-controlled “On-Off” electrochemical sensor for the detection of hydroquinone (HQ) is constructed by using a composite film of temperature-sensitive polymer poly (N-vinylcaprolactam) (PNVCL), the nanomaterial rGO@Au and the monoclinic bismuth metavanadate (m-BiVO 4 ). The sensor exhibits good temperature sensitivity and reversibility. When the temperature drops below the Lowest Critical Solution Temperature (LCST) of the PNVCL, the PNVCL will be in a “stretched” state, which hinders the electron exchange between hydroquinone and the surface of the electrode, presenting an “Off” state for the sensor. On the contrary, when the temperature exceeds the LCST, the PNVCL will be in a “contracted” state, which hydroquinone can perform an effective redox process and generate a response current, showing an “On” status. Due to the good electroconductivity and electrocatalytic ability of rGO@Au and m-BiVO 4 , the proposed sensor showed excellent detection performances. Hence, the sensor shows wide linear ranges (2.0 to 30.0 μM and 30.0 to 152.0 μM) and low limit of detection (0.6 μM). In addition, the “On-Off” electrochemical sensor may provide new ideas for the application of intelligent polymers.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yukun Li,Dan Zhang,Qishi Chen,Cong Chao,Junhong Sun,Shuying Dong,Yuyang Sun
In this study, reduced graphene oxide-based graphitic carbon nitride (rGO/g-C 3 N 4 ) composite was fabricated via thermal polymerization-hydrothermal method and were utilized to activate peroxydisulfate (PDS) under simulated solar light irradiation. The as-synthesized rGO/g-C 3 N 4 was demonstrated to effectively remove methyl orange (MO) in wastewater. Notably, 92.3% of MO (15 mg/L) was removed within 120 min in the presence of 0.2 g/L rGO/g-C 3 N 4 and 0.225 g/L PDS. The influence of activator dosage, PDS concentration and co-existing solution matrix on the removal efficiency was investigated. Free radical capture experiments confirmed that SO 4 ¯ · , photogenerated holes (h + ), O 2 ¯ · and non-radical reaction initiated by rGO played a major role in MO removal. Furthermore, PDS and rGO acted as the electron acceptor and transfer carrier of the photogenerated charges, respectively, resulting in the efficient activation of PDS. The promoting visible light absorption might be ascribed to the defect sites on the surface of rGO/g-C 3 N 4 , which generated from the rGO loading. This study revealed that the as-synthesized rGO/g-C 3 N 4 composite exhibits wide promising application prospects as a photocatalytic activator of PDS for the degradation of azo dyes in textile wastewater.
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ENERGY & FUELS
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2022
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IF 4.654
Fangzhao Pu,Xuecheng Zheng,Xintian Zhao,Xiaojing Zhang,Zhimao Yang,Hong Jin,Chuncai Kong
From the perspective of promotion of metal oxide anodes’ performance, structural design and reinforcement of carbon materials are always concerned as useful methods. In addition, high hope is being placed on the use of graphene as an ideal potential carbon reinforcement material for an abundant energy market, but currently, commercial graphene has poor intrinsic properties, which hamper its development in the energy storage area. Therefore, combining the metal oxide materials with commercial graphene by a rational structure design could be a more hopeful method to realize the productive use of commercial graphene in the energy storage area. In this work, hollow cupric oxide (CuO) decorated on reduced graphene oxide (rGO) is prepared by an effective glycol–water combined rapid oxidation strategy. The well-designed composite yields a high initial capacity of 1491 mAh/g and maintains 960 mAh/g after 500 cycles at 1.0 A/g. The remarkable reversible capacity may be attributed not only to the hollow structure of CuO, but also to the bidirectional synergy between graphene and the small-sized CuO. The galvanostatic intermittent titration technique (GITT) and density functional theory (DFT) calculation are conducted to analyze the relationship between the electrochemical properties and surface states. The GITT test shows that the ion diffusion coefficient is higher when the smaller hollow CuO is decorated on rGO. Additionally, the DFT results indicate that more active electrons appear on the surface of the composite. As a result, the as-prepared hollow and smaller CuO-decorated rGO presents excellent performance in terms of specific capacity and rate capability.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Hafiz Muhammad Adeel Sharif,Muhammad Bilal Asif,Yuwei Wang,Ya-Nan Hou,Bo Yang,Xu Xiao,Changping Li
Iron (Fe)-based catalysts are widely used for taming nitrogen oxides (NO x ) containing flue gas , but the regeneration and long-term reusability remains a concern. The reusability can be acquired by external additives, and resultantly can not only increase the cost but can also add to process complexity as well as secondary pollutants. Herein, a self-sustainable material is designed to regenerate the catalyst for long-term reusability without adding to process complexity. The catalyst is based on reduced graphene-oxide impregnated by Fe 2 O 3 -MnO (rGO@Fe 2 O 3 -MnO; G-F-M) for spontaneous intra electron (e - )-transfer from Mn to Fe. The developed catalyst; G-M-F exhibited 93.7% NO x reduction, which suggests its high catalytic activity . The morphological and structure characterizations confirmed the Fe/Mn loading, contributing to e - -transfer between Mn and Fe due to its conductivity. The synthesized G-F-M showed higher NO x reduction about 2.5 folds, than rGO@Fe 2 O 3 (G-FeO) and rGO@MnO x (G-MnO x ). The performance of G-M-F without and with an electrochemical system was also compared, and the difference was only 5%, which is an evidence of the spontaneous e - transfer between the Mn and Fe-NO x complex. The designed catalyst can be used for a long time without external assistance, and its efficiency was not affected significantly (<3.7%) in the presence of high oxygen contents (8%). The as-prepared G-M-F catalyst has great potential for executing a dual role NOx removal and self-regeneration of catalyst (SRC), promoting a sustainable remediation approach for large-scale applications.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 30
·期 3
·8098-8109
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IF 5.19
Shan Junyue,Wu Xianliang,Li Caifang,Hu Jiwei,Zhang Zhenming,Liu Huijuan,Xia Pinhua,Huang Xianfei
The photocatalytic degradation of antibiotics requires a good separation efficiency of photogenerated electron–hole pairs and a wide visible light absorption range. Current studies have discussed the successful preparation of ferroferric oxide/graphite carbon nitride/reduced graphene oxide (Fe 3 O 4 /g-C 3 N 4 /rGO). The phase structure and morphology of the Fe 3 O 4 /g-C 3 N 4 /rGO composites were characterized by XRD, HR-TEM, SEM, and EDS. The obtained composites were used to degrade tetracycline hydrochloride (TCH) to evaluate its photocatalytic activity. The effects of four variables on the degradation of TCH were analyzed by the response surface method and artificial intelligence (gradient regression tree, random forest, artificial neural network, etc.). The results showed that the graphite carbon nitride in the catalyst maintained its original structure and that the photocatalytic activity was significantly improved. The degradation rate of TCH was 86.7% under the optimal conditions (the Fe 3 O 4 /g-C 3 N 4 /rGO dosage was 0.1 g, pH = 7.0, the initial concentration of TCH was 20 mg/L, and the visible light irradiation time was 60 min). At the same time, the degradation rate of TCH changed little after the material was used five times, which indicates that the stability and recyclability of the Fe 3 O 4 /g-C 3 N 4 /rGO photocatalyst were excellent. Finally, a possible photocatalytic mechanism of the Fe 3 O 4 /g-C 3 N 4 /rGO photocatalyst is proposed in this paper.
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高影响因子
TEXTILE RESEARCH JOURNAL
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2021
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IF 1.82
Wenjun Li,Hui Zhang,Tianyu Chen,Limeng Yang,Cuihong Sheng,Hailiang Wu,Ningtao Mao
The self-cleaning textiles coated with reduced graphene oxide-titanium dioxide (TiO2) nanocomposites have enhanced photocatalytic activities and could have great potential in practical applications. However, it is still problematic regarding how to avoid aggregation of reduced graphene oxide nanosheets in producing reduced graphene oxide-TiO2 nanocomposites. In this research article, we propose a new method to reduce the aggregation of reduced graphene oxide nanosheets in producing cotton fabrics coated with reduced graphene oxide-TiO2 nanocomposites by combining vibration-assisted ball milling and hydrothermal synthesis process. The microstructure and photocatalytic-related properties of the resultant reduced graphene oxide-TiO2 nanocomposites and their coating cotton fabrics were characterized by using a series of techniques including field emission scanning electron microscope (FESEM), atomic force microscope (AFM), X-ray diffraction spectroscopy (XRD), Raman, particle size distribution, Brunauer-Emmett-Teller,(BET), transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS), diffuse reflectance spectra (DRS), ultraviolet photoelectron spectroscope (UPS), and photoluminescence (PL). It was indicated that the aggregation of reduced graphene oxide nanosheets in reduced graphene oxide-TiO2 nanocomposites was successfully avoided via ball milling in the presence of tetrabutyl titanate. After hydrothermal treatment, the resulting reduced graphene oxide-TiO2 nanocomposites were firmly immobilized on cotton fabric. It was demonstrated in the self-cleaning experiments that the resultant self-cleaning cotton fabrics are hydrophilic and could directly decompose color contaminants such as methylene blue, Congo red, and coffee stains under simulated sunlight irradiation due to the photo-degradation reactions of the reduced graphene oxide-TiO2 nanocomposite coating. The reduced graphene oxide-TiO2 nanocomposite-modified cotton fabric also exhibited excellent performance in both robust abrasion resistance and soap-washing resistance. The fabric photocatalytic self-cleaning capability was not found to decrease significantly after being repeatedly used for five times.
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高影响因子
ENERGY & FUELS
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2021
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IF 3.605
Yunfei Yan,Chenghua Zhang,Tao Jia,Haojie Li,Kaiming Shen
Aimed at achieving high efficiency of photocatalytic hydrogen production from ammonia borane (NH3BH3, AB), a reduced graphene oxide (rGO)-modified TiO2 photocatalyst was proposed for hydrogen production. In this study, rGO/TiO2 photocatalysts with different rGO contents were prepared and characterized by XRD, UV–vis DRS, FTIR, Raman, and SEM. The experimental results showed that addition of rGO can reduce the band gap energy of TiO2, and the band gap energy of rGO/TiO2 varies with the content of rGO, and 1% rGO/TiO2 has the lowest band gap energy of 2.96 eV. This indicates that the modification of TiO2 by rGO not only increases the probability of electron transition but also promotes the separation of photoelectron and hole pairs due to the good conductivity of rGO so as to improve the quantum efficiency of photocatalysis. In addition, compared with pure TiO2, rGO/TiO2 shows a certain photocatalytic activity under the condition of light irradiation. Among the rGO/TiO2 photocatalysts with different contents of rGO, 1% rGO/TiO2 shows the best photocatalytic performance of ammonia borane hydrolysis, and the value of turnover frequency is 1088.93 μmol·min–1·g–1. Furthermore, the catalyst 1% rGO/TiO2 shows perfect reusability, and its catalytic activity did not decrease significantly even after five reaction cycles.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Jian Wu,Jinlei Meng,Zhanhong Yang,Hongzhe Chen,Yao Rong,Lie Deng,Zhimin Fu
Aqueous zinc-ion batteries (AZIBs) are expected to be used for large-scale energy storage, due to their environmentally friendly, low cost, abundant global stockpile, high capacity. However, the development of high-performance cathodic materials still faces huge challenges. Herein, cuprous oxide (Cu 2 O) and Cu 2 O/reduced graphene oxide (rGO) are first reported as a cathode for AZIBs respectively. Simultaneously, the Zn//Cu 2 O/rGO battery exhibits significantly enhanced electrochemical performance with a high rate performance and an excellent cycle lifespan (139 mAh g −1 after 500 cycles at 1 A g −1 with 95.9% capacity retention), which is extremely excellent in copper-based zinc-ion battery cathode materials . Moreover, ex-situ XRD and XPS results have revealed a hybrid mechanism involving conversion reactions and classical insertion/extraction reaction. when the Zn//Cu 2 O/rGO battery discharged from the initial state to 0.2 V, part of Cu 2 O will be reduced to Cu 0 with the insertion of zinc ions ; when the Zn//Cu 2 O/rGO battery charged to 1.1 V, Cu 0 is completely oxidized to Cu 2 O with the deintercalation of zinc ions, and only Cu + is existing at this time. The results reveal the energy storage mechanism of the Cu 2 O/rGO electrode, which will provide significant help for the research on copper based cathodic materials and expect to be further explored in other ion-batteries.
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JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Ning Li,Wenyi Wang,Chao Ma,Liuyong Zhu,Xingyu Chen,Bingjie Zhang,Chongli Zhong
Ultrafiltration membranes have shown remarkable potential in the purification of textile printing and dyeing wastewater. However, ultrafiltration membranes have some disadvantages in wastewater treatment , such as membrane fouling and trade-off effect. Hence, a novel polysulfone (PSF)-reduced graphene oxide (rGO)-zinc oxide (ZnO) composite conductive ultrafiltration membrane was prepared via the simple and green method. The combination of conductive ultrafiltration membrane and external electric field could treat dye wastewater. The conductive rGO/ZnO/PSF membranes have high water flux (296 L m −2 h −1 Bar −1 ) and favorable removal rates (>90%) for Congo Red (CR), Methyl Orange (MO), and Methylene Blue (MB). Besides, rGO/ZnO/PSF membrane also showed excellent antifouling ability, which had a flux recovery rate of 93% after filtration of bovine serum albumin (BSA) under applied electric field. Due to the electrocatalytic cleaning, rGO/ZnO/PSF membrane exhibited a 90% flux recovery after filtering the dye. The rGO/ZnO/PSF membrane has good separation efficiency, electrocatalytic stability, and fouling resistance, and can effectively solve the purification of textile printing and dyeing.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Boqiu Luo,Yiran Han,Tingting Yang,Junyou Li,Hao Wang,Wenjing Chen,Xiaoke Li
Strong solar capture and high heat transfer are extremely vital for designing solar-to-heat absorber to improve photo-thermal conversion efficiency in direct absorption solar collectors (DASCs). In this paper, the plasmonic nanofluids containing reduced graphene oxides (rGO) decorated with titanium nitride (TiN) nanoparticles were prepared. Their superior solar-thermal conversion efficiency and heat transfer property was based on the synergy between the Localized Surface Plasmon Resonances (LSPR) effect of TiN and the high thermal conductivity of rGO. The optical properties of plasmonic nanofluids were investigated with the concentration and penetration depth, which indicated that the existence of TiN on graphene could improve the light-capture ability. The results indicated that the TiN@rGO plasmonic nanofluids could be used for DASCs applications, even under the low mass concentrations. Specifically, the maximum photo-thermal conversion efficiency of the plasmonic nanofluids was 66.74% at 40 ppm concentration, which was about 23% higher than that of pure water. And, the experimental results show that the photothermal conversion efficiency will be reduced if the nanofluid concentration is higher than the optimal concentration. This work exhibited the potential application of plasmonic-graphene nanofluids in DASCs.
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高影响因子
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