CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Feifei Wang,Xiaolin Yu,Maofa Ge,Sujun Wu
A series of TiO 2 and γ-Fe 2 O 3 co-doped graphene oxide (GO) nanosheets ( x TiO 2 /γ-Fe 2 O 3 /GO) were prepared by a facile self-assembly method. The characterization results show that the x TiO 2 /γ-Fe 2 O 3 /GO have the advantages of narrow band gap energies (<2.47 eV), and high structure stability. The incorporation of TiO 2 into γ-Fe 2 O 3 /GO composite dramatically enhances the catalytic activity, and the 0.03TiO 2 /γ-Fe 2 O 3 /GO composite exhibits the highest catalytic efficiency (99%) for ciprofloxacin (CIP) degradation (10 mg/L, 50 ml) within 140 min under visible light, which is ~1.5 times higher than that of γ-Fe 2 O 3 /GO composite without TiO 2 . Furthermore, the photo-Fenton like mechanism was proposed by quenching experiment and electrochemistry method. The intermediates of the CIP degradation were analyzed by the assistance of LC-MS technology, which provides insight into the pathway of CIP degradation.
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RSC Advances
·
2019
·Vol. 9
·期 70
·41209-41217
·
IF 3.049
Xiaoxuan Di,Feng Guo,Zihan Zhu,Zhonghao Xu,Ziqi Qian,Qian Zhang
A novel ZnO–GO/CGH composite was prepared using an in situ synthesis process for photodegradation of methylene blue under visible light illumination. The chitin–graphene composite hydrogel (CGH) was used to provide uniform binding of the nano ZnO–GO composite to the hydrogel surface and prevent their agglomeration. GO provides multi-dimensional protons and electron transport channels for ZnO with a flower-like structure, which possessed improved photo-catalytic activity. SEM analysis indicates that the hydrogel has good adsorption properties with rougher surfaces and porous microstructure, which enables it to adsorb the dyes effectively. Under synergetic enhancement of adsorption and photo-catalysis, catalytic activity and nano ZnO–GO/CGH recycling improved greatly. Synthesized nano ZnO–GO/CGH showed high dye removal efficiency of 99%, about 2.2 times that of the pure chitin gel under the same condition. This suggests the potential application of the new photocatalytic composites to remove organic dyes from wastewater.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 20
·18617-18625
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IF 2.195
Meng Zuchao,Li Mao,Liu Xiang,Lei Zigang
A new hydrazine electrochemical sensor was fabricated based on in situ synthesis of Cu 3 (BTC) 2 /GO nanocomposite. Cu 3 (BTC) 2 /GO composite were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectrometry (FT-IR). Meanwhile, the electrochemical behaviors of hydrazine on the Cu 3 (BTC) 2 /GO/GCE were studied by cyclic voltammetry and linear sweep voltammetry. Under the optimized conditions, Cu 3 (BTC) 2 /GO/GCE had enhanced electrocatalytic activity toward hydrazine due to synergic catalytic effect between Cu 3 (BTC) 2 and GO. The electrochemical sensor exhibited a wider linear range (1.0 µM to 5000 µM) and a lower detection limit (0.5 μM) as well as good reproducibility and stability. The proposed sensor has also been used for the determination of hydrazine in tap water with satisfactory results.
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CARBON
·
2022
·
IF 11.307
Jianang Sha,Rongrong Chen,Jing Yu,Qi Liu,Jingyuan Liu,Jiahui Zhu,Peili Liu,Rumin Li,Jun Wang
Marine biological fouling is the undesirable accumulation on the surfaces of submerged objects and causes environmental and economic consequence to ships and marine facilities. However, traditional coatings achieve antifouling by releasing toxic heavy metal antifouling agents, causing ecological problems. And the static antifouling performance of self-polishing antifouling coating is not good. To overcome the shortcoming, a novel antifouling strategy to build a self-renewing multi-level microstructure on the coating surface was developed by dispersing GO-based quaternary polymer brushes in a self-polishing fluoro/silyl acrylate copolymer . Quaternized GO exhibits excellent dispersibility in the silyl-based acrylate copolymer. A dynamic self-renewing surface is realized for the coating via a self-polishing effect that exposes the filler inside the coating at the surface. The multi-level microstructure of the sharp edge of GO and quaternized “spear” structure destroys the cell wall of organisms. And a “water-shield” on amphoteric ion surface on quaternized GO inhibits adhesion of organisms. The antibacterial and anti-algae tests demonstrated the excellent antifouling effect of the coating at only 0.1% (mass) filler content , with anti-algae ratio against Nitzschia closterium ( N. closterium ), Phaeodactylum tricornutum ( P. tricornutum ) and Halamphora sp. of 83.7%, 52.4%, and 65.8%, respectively. The proposed preparation method is simple and potentially applicable to large-scale production for antifouling application.
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Advanced Science
·
2023
·Vol. 10
·期 20
·2207250
·
IF 15.1
Xue Bai,Mengyao She,Yali Ji,Zhe Zhang,Wenhua Xue,Enzhou Liu,Kerou Wan,Ping Liu,Shengyong Zhang,Jianli Li
Photocatalysis is an important technique for synthetic transformations. However, little attention has been paid to light-driven synergistic redox reactions for directed synthesis. Herein, the authors report tunable oxidation of benzyl to phenylcarbinol with the modest yield (47%) in 5 h via singlet oxygen ( 1 O 2 ) and proton-coupled electron transfer (PCET) over the photocatalyst Zn 0.5 Cd 0.5 S (ZCS)/graphene oxide (GO) under exceptionally mild conditions. Theoretical calculations indicate that the presence of S vacancies on the surface of ZCS/GO photocatalyst is crucial for the adsorption and activation of O 2 , successively generating the superoxide radical ( • O 2 − ) and 1 O 2 , attributing to the regulation of local electron density on the surface of ZCS/GO and photogenerated holes (h + ). Meanwhile, accelerated transfer of photogenerated electrons (e − ) to GO caused by the π – π stacking effect is conducive to the subsequent aldehyde hydrogenation to benzyl alcohol rather than non-selective oxidation of aldehyde to carboxylic acid. Anisotropic charge transport driven by the built-in electric field can further promote the separation of e − and h + for multistep reactions. Promisingly, one-pot photocatalytic conversion of p -xylene to 4-methylbenzyl alcohol is beneficial for reducing the harmful effects of aromatics on human health. Furthermore, this study provides novel insights into the design of photocatalysts for cascade reactions.
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ACS Omega
·
2023
·
IF 4.1
Jilai Jia,Weijia Zhu,Xiaoping Du,Zia-ud Din,Fang Xie,Jiaojiao Zhou,Jie Cai
Due to their high toxicity and ongoing bioaccumulation, mercury ions (Hg2+) can cause significant harm to both the environment and human health. Therefore, rapid, accurate, and selective methods for Hg2+ detection are highly desirable. Herein, we present a simple method for depositing platinum nanoparticles (PtNPs) on graphene oxide (GO) to obtain graphene oxide-PtNPs (GO-PtNPs). The fabricated GO-PtNPs exhibit excellent peroxidase-like activity and high stability. Further, the GO-PtNPs nanozymes preferentially reduced Hg2+, thereby inhibiting the catalytic activity. By monitoring the color change in the chromogenic substrate, Hg2+ can be detected within 15 min. With a detection limit of 88.3 pM, the GO-PtNPs system may be employed to detect Hg2+ in a linear range of 0.1 nM to 10 μM. The simplicity and low cost of the proposed approach as well as its applicability to complicated samples demonstrate its capacity for mercury sensing in environmental samples.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xia Zhan,Rui Ge,Teng Huo,Juan Lu,Jiding Li
Graphene oxide (GO) membranes exhibit ultrafast water permeation properties, which have been employed in various membrane-based separations including nanofiltration for dye removal from textile wastewater. However, it’s still a great challenge to achieve precise control over the microstructure of GO membranes and obtain ultrathin GO membranes with exceptional separation efficiency and robust membrane structure. Herein, in-situ confined interfacial polymerization (IP) is proposed for fabricating loose polyamide (PA)@GO hybrid membranes with high permeance and dye rejection as well as robust membrane stability. A new diamine of sulfadiazine (SA) with intrinsic hydrophilic and conjugated sulfonamide groups is employed as cross-linker of GO membranes and monomer of PA in IP process, simultaneously. PA is in-situ synthesized in confined GO interlayer via IP process and intercalated into GO interlayer, which enlarges the interlayer spacing of GO membranes gradiently. The combination of hydrophilic PA nanofiltration layer on GO membrane surface and the PA intercalated GO membrane with varying interlayer spacing creates hierarchical transport channels for water molecules, which contributes to the high water permeance. Moreover, the less reactive SA monomer endows PA@GO selective layer with appropriate negative charge and loose transport channels, which contributes to both of high permeance and dye rejection due to Donnon effect and size exclusion effect. The PA@GO hybrid membrane exhibits high permeance of 75.5 L/(m 2 ·h·bar) with TB dye rejection of 99.8 %, and exhibits low NaCl rejection of 11.6 %. Moreover, PA@GO hybrid membrane shows good fouling resistance and long-term stability as well as stable separation performance under harsh conditions. Both of high permeance and dye rejection of PA@GO hybrid membrane suggests that the integration of PA nanofiltration layer and GO membrane via in-situ confined interfacial polymerization can achieve the delicate control over the interlayer channel structure and the physicochemical properties of the membrane surface of GO membranes, which offers a promising method to break through the trade-off effect between permeability and selectivity of GO membranes.
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Nanomaterials
·
2023
·Vol. 13
·期 20
·2777
·
IF 5.3
Zhenhua Feng,Chengwen Liu,Binbin Tang,Xiaojun Yang,Wenjie Jiang,Peng Wang,Xianjun Tang,Hongshan Wang,Xiangdong Zeng,Guangyong Zeng
Graphene oxide (GO) two-dimensional (2D) membranes with unique layer structures and tunable layer spacing have special advantages and great potential in the field of water treatment. However, GO membranes face the issues of weak anti-swelling ability as well as poor permeability. We prepared GO/Ti3C2TX2D composite membranes with 2D/2D structures by intercalating Ti3C2TXnanosheets with slightly smaller sizes into GO membranes. Ti3C2TXintercalation can effectively expand the layer spacing of GO, thereby substantially enhancing the flux of the composite membrane (2.82 to 6.35 L·m−2·h−1). Moreover, the GO/Ti3C2TXcomposite membrane exhibited a good Mg2+/Li+separation capability. For the simulated brine, the separation factor of M2 was 3.81, and the salt solution flux was as high as 5.26 L·m−2·h−1. Meanwhile, the incorporation of Ti3C2TXnanosheets significantly improved the stability of GO/Ti3C2TXmembranes in different pH environments. This study provides a unique insight into the preparation of highly permeable and ion-selective GO membranes.Keywords:graphene oxide;Ti3C2TXnanosheets;two-dimensional materials membrane;Mg2+/Li+separation
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Zhuo Xiang,Libo Tong,Miaomiao Li,Xiangjun Li,Meng Ju,Wanting Sun,Bing Zhang,Kuaishe Wang
Conventional surface coatings exhibit poor self-healing ability, especially under the acid corrosion conditions, which is regarded as a huge challenge for the effective protection of Mg alloy . In this study, a smart self-healing hybrid coating is facilely fabricated, providing an excellent long-term anti-corrosion performance for Mg alloys within the harsh environments. Mesoporous silica (MS) loaded with corrosion inhibitor benzotriazole (BTA) is grafted onto the surface of graphene oxide (GO), to synthesize GO-based nanomaterials , which can be uniformly dispersed in the epoxy (EP) coating through ring opening reaction and form the covalent bonds . Electrochemical Impedance Spectroscopy (EIS) results show that the modulus of the EP-GO-MS-BTA hybrid coating remains at 2.57 × 10 11 Ω cm 2 after immersion in 3.5 wt% NaCl solution for 15 days. In contrast to previously reported works that achieved the self-healing ability in acidity, the current EP-GO-MS-BTA coating represents an ultra-high self-healing efficiency of 1.2 × 10 8 Ω cm 2 h −1 under acid 3.5 wt% NaCl condition (pH = 3). Due to the labyrinth effect, the impermeability of epoxy coating is enhanced by the ameliorative dispersity of GO sheet. In addition, the as-prepared GO-based nanomaterial can be used to load corrosion inhibitor BTA and possess H + ion-responsive release property, leading to an improved corrosion protection . Combining the dual effects of superior GO dispersion and smart self-healing, it will provide a green and convenient synthetic method for constructing self-healing coatings with the excellent anticorrosion resistance.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yan Huang,Wenfu Lin,Ziruo Zhang,Zhenru Li,Tiansheng Huang,Jie Li,Li-Peng Sun,Bai-Ou Guan
Volatile organic compound (VOC) sensors have recently been developed with sensitive coating layers to improve their performance. However, there are inevitable trade-offs in the performance of the VOC sensors with sensitive layers. It remains challenge to achieve higher sensitivity, faster response time, working at room temperature and better selectivity at the same time for real-world applications. In this work, we demonstrated a novel photothermal-assisted gas sensor using a microfiber long period grating (LPG) modified with zeolitic imidazolate framework-90 (ZIF-90)/graphene oxide (GO) for enhanced VOC acetone sensing. The GO-isolated ZIF-90 exhibited ultralow conductivity and high porosity, which significantly promoted light-to-heat energy conversion by trapping thermal and minimizing heat loss. Besides, the natural porosity and ultrahigh surface area of the ZIF-90 showed superior molecular adsorption making it a good choice for the acetone-sensitive layer. Based on the porous ZIF-90/GO nanohybrid and photothermal effects, the proposed sensor showed improved performance compared without adding laser towards acetone, with the sensitivity of 26.1 pm/ppm and low limit of detection of 760 ppb. Moreover, the proposed photothermal technology enhanced the response time down to 410 ms without sacrificing sensitivity. Thus, our proposed sensor constitutes a promising platform for effective acetone sensing systems that can be used for environmental monitoring and industry.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Jianyu Jiang,Hong Zhang,Lingwei Liu,Zijian Bai,Junwen Che,Yan Wang,Fengyu Quan
We developed a novel functional material that combined porous structures with solidified phase change materials (PCMs). This material, known as a double network Polyethylene Glycol/Graphene Oxide/Polyacrylic Acid phase change aerogel (PGA), was synthesized by the one-step method of solution polymerization . Polyethylene glycol (PEG) was chosen as the PCM, while polyacrylic acid (PAA) and graphene oxide (GO) were used as the first and second networks. The double networks in PGA served to immobilize PEG through hydrogen-bonding interaction and interwining. As a result, the PGA exhibited excellent phase change performance, with a phase change enthalpy of 108.9 J/g and an impressive enthalpy efficiency of 93.1%. The PGA possesses a porosity of 34%, a specific surface area of 53 m 2 /g, an average pore diameter of 0.35 μm. The three-dimensional network skeleton, consisting of PEG, GO, and PAA, leveraged the GO to enhance phase change conductivity, while maintaining thermal insulation through a uniform mesh structure. Moreover, the PGA material demonstrates remarkable thermal stability even after 35 thermal cycles. When used to construct insulated cups, the PGA materials exhibited superior thermal insulation and phase change modulation compared to air laminated glass cups. This highlights its potential application in reducing energy consumption and increasing energy utilization efficiency.
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RSC Advances
·
2023
·Vol. 13
·期 28
·19002-19010
·
IF 3.9
Han Runlin,Wang Chaoyue,Bi Congcong,Wang Hanli
Polyvinylidene fluoride (PVDF) has been widely studied and applied in separation membranes due to its high thermal and chemical stability and mechanical strength. However, PVDF has strong hydrophobicity, resulting in easy contamination of the membrane surface and fast flux attenuation, so it is necessary to modify the membrane surface to improve its separation selectivity and service life. In this paper, PVDF microporous membrane was used as the matrix material and graphene oxide (GO) as the separation layer material. The GO/Mn3O4/PVDF composite membrane was prepared by layer self-assembly of GO nanosheets, and the functional layer spacing was adjusted by nanometer Mn3O4 intercalation. The prepared composite membrane showed high flux and separation selectivity in the filtration of organic compounds. The results showed that the rejection of methylene blue increased from 34% to 99.5%, and the flux decreased from 3000 L m−2 h−1 to 95 L m−2 h−1 when GO nanosheets covered the PVDF supporting membrane. After the introduction of Mn3O4 nanowires in the GO interlayer, the dye rejection reached 99.9% and the flux reached 612 L m−2 h−1. Compared with the unintercalated composite membranes, the flux of the prepared composite membranes showed good stability in the treatment of methylene blue, and the rejection remained unchanged.
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