JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Qianyu Xu,Xiaoyu Lin,Li Gan,Gary Owens,Zuliang Chen
While chemical methods are often used to convert graphene oxide (GO) to reduced graphene oxide (RGO), chemical reduction is often environmentally unfriendly due to the high toxicity of many chemical reducing agents. To address this limitation, Bacillus sphaericus was used here for the green reduction of GO to RGO. Successful reduction was confirmed by various advanced characterization techniques including Ultraviolet–Visible (UV–vis), X-ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscope and Energy Dispersive Spectrometer (SEM-EDS). With a new peak attributable to RGO at 261 nm appearing in UV–vis and XRD spectra of the reduced product also developed a new peak at 2θ = 24.6° characteristic of RGO. Successful reduction was also supported by Raman spectroscopy which showed that the ratio of the intensity band (D band: G band) increased from 0.99 to 1.17. FTIR and XPS both confirmed that specific O H (3399 cm −1 ), C O (1734 cm −1 ) and C O C (287 eV) bonds were reduced. Cyclic voltammograms (CVs) showed that the produced RGO exhibited good conductivity (changed from 0.8 to 1.1 mW·cm −2 ). This work developed a green and easy operated method of synthesizing RGO using microorganisms.
研究领域:
材料科学
·
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Shaolin Yang,Simiao Sha,Hui Lu,Jiandong Wu,Jinfu Ma,Dewei Wang,Chunping Hou,Zhilin Sheng
Fabrication of filtration membranes with opposite wettability for the separation of immiscible oil/water mixture has aroused extensive attention owing to the avoidance of oil/water density relationship limitation. Herein, we demonstrate a low-cost, mild and environment-friendly method to prepare underwater superoleophobic graphene oxide (GO) coated fabric through dip-coating of GO nanosheets onto cotton fabric, and the superhydrophilic GO coated fabric can be converted to superhydrophobic reduced graphene oxide (rGO) coated fabric after chemical reduction of the coated GO. The GO and rGO coated fabrics show excellent efficiencies for unidirectional separation of various light oils and heavy oils from water, respectively. Both types of fabrics could maintain their original wettability in harsh environments, and demonstrate high efficiency and recyclability for the separation of oil/water mixtures containing hot water, acid and salt. Furthermore, a T-shaped bidirectional separation device was devised by integrating the two fabrics with opposite wettability, which can realize high-efficient continuous separation of various oil/water mixtures regardless of the oil density.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2016
·Vol. 3
·期 5
·055002
·
IF 0.968
Xiaodong Deng,Xiaonan Liu,Tao Duan,Wenkun Zhu,Zao Yi,Weitang Yao
Bayberry tannin (BT)–reduced graphene oxide (rGO) sponges have been prepared by self–assembly, with bayberry tannin serving as both reductant and surface functionalization agent. The synthetic method is based on the self-assembly of graphene oxide (GO) sheets into porous hydrogel structures. By varying the weight ratio of GO to BT, a series of sorbents with different densities of organic molecules have been obtained and applied to remove Sr2+ from aqueous solutions. Adsorption isotherms (Langmuir and Freundlich) and kinetics (pseudo-first order and pseudo-second order) have been investigated to discuss the sorption performance of rGO/BT sponges. The rGO/BT (w/w 1:1) sponge shows excellent adsorption properties for Sr2+, with maximum capacities of 67.98 mg g−1. The adsorption capacity is much higher than those in classic Sr2+ adsorbents, such as hydrous manganese dioxide, Egyptian soils, Hydroxyapatite nanoparticles, sodium hexa-titanate nanofibers, Graphene oxide, artificially altered phlogopite(Ca–Phl), and PB/Fe3O4/GO. Adsorption mechanisms have been examined using the x-ray photoelectron spectra of sorbents before and after Sr2+ adsorption, and the results indicate that the sorption of Sr2+ on GO and GO/BT 1.0 is largely depended on oxygen functional groups. The results show that the GO/BT sponge is a promising candidate for adsorbing Sr2+ ion.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Mengzhu Xue,Peiyao Li,Chang Li,Yonghao Qi,Zhentong Han,Jiarui Li,Ao Li,Tianjiao Xia
Graphene oxide (GO) is a representative novel carbonaceous nanomaterial, and neonicotinoid insecticides (NEOs) are currently the insecticides with the highest market share in the world. Their widespread application deservedly leads to their release to the environment. Thus, the complex interactions of these two types of organic compounds have attracted extensive attention. In this study, the effects of GO and its derivatives, reduced GO (RGO) and oxidized GO (OGO), on the photolysis of imidacloprid (IMD) (a typical NEO) under ultraviolet (UV) irradiation were systematically investigated. The results showed that the presence of the graphene-based nanomaterials (GNs) largely depressed the photodegradation of IMD, and the inhibition degree followed the order of RGO > GO > OGO. This was because the sp 2 π-conjugated structure in the GNs caused light-shielding effect and attenuated the direct photolysis of IMD, even though the GNs-generated reactive oxygen species (ROS) promoted the indirect photodegradation of IMD to a certain extent. Additionally, the rich O-functionalized GO and OGO altered the photolysis pathway of IMD and induced more toxic intermediate products. These results highlight the implication of carbonaceous nanomaterials on the behavior, fate and potential risk of NEOs in aqueous systems.
研究领域:
环境科学
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纳米技术
·
化学工程
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yunfei Sun,Min Ma,Bo Tang,Sen Li,Li Jiang,Xiaohong Sun,Miaoling Que,Chongben Tao,Zhengtian Wu
The copper-benzene-1,3,5-tricarboxylate (Cu-BTC) attracts increasing attention because of its large BET surface area available for the adsorption of gases. However, low stability in water creates a barrier for its potential applications. In this study, graphene oxide (GO) and reduced graphene oxide (RGO) are adopted to modify the Cu-BTC. The influence of GO and RGO on the resulting BET surface area, pore diameter distribution, morphology and yield of the Cu-BTC are revealed. It is found that the adsorption abilities of the resulting composites for the polar and nonpolar gas molecules are closely related to the presence at surface of the functional groups of the used graphene samples, which provides a potential method to achieve selective adsorption. Furthermore, the preparation processes of the GO/Cu-BTC and RGO/Cu-BTC exert a significant effect on the performances of the resulting product, which is also studied in detail.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2015
·Vol. 34
·期 1
·111-121
·
IF 1.835
Zhao Li-fen,Li Qi,Zhang Ru-liang,Tian Xiu-juan,Liu Lei
The effects of graphene oxide (GO) with polar groups and functionalized GO (fGO) with nonpolar groups on the isothermal crystallization of poly( L -lactide) (PLLA) were compared. Functionalized GO was obtained by grafting octadecylamine and characterized by FTIR, WAXD and TGA. Isothermal crystallization kinetics of PLLA/GO and PLLA/fGO nanocomposites were investigated by combining DSC data and Avrami equation. The results showed that fGO could improve PLLA crystallization rate more obviously than GO. By analyzing the morphology obtained from POM, SEM and TEM, it was found fGO with large layer space dispersed better in PLLA and supplied more nucleation sites than GO. Therefore, for the multilayer graphene, increasing the layer spaces is important to improve its dispersion in polymers, which will cause the crystal kinetics changing of polymers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2013
·
IF 1.977
Xiyao Teng,Manqing Yan,Hong Bi
The surface characteristics of graphene oxide nanosheets (GO) treated respectively with tartaric acid, malic acid and oxalic acid, have been investigated by mainly using optical spectroscopic methods including Fourier transform infrared spectroscopy (FT-IR), Ultraviolet–visible (UV–Vis) absorption and Raman spectroscopy. Additionally, the electrochemical property of the products has also been studied. The data revealed that oxygen-containing groups such as OH, COOH and C O on the GO surface have been almost removed and thus reduced graphene oxide nanosheets (RGN) were obtained. Interestingly, the number of sp 2 domains of RGN increases as treated by tartaric acid < malic acid < oxalic acid whereas the steric hindrance (SH) decreases and the ionization constant (IC) differs among these three acids. Furthermore, the specific capacitances ( C s ) of GO have been greatly promoted from 2.4 F g −1 to 100.8, 112.4, and 147 F g −1 after treated with tartaric, malic and oxalic acids, respectively. This finding agrees well with the spectra result of the tendency of surface conjugated degree alteration. We claim that the difference in both SH and IC among these acids is the main reason for the diverse surface characteristics as well as the improved C s of the RGN.
研究领域:
材料科学
·
表面化学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Hazardous Materials Advances
·
2021
·
IF 0
Luo Li,Yi Li,Chunhu Tan,Tingting Zhang,Xiaoli Xin,Weihua Li,Jiansheng Li,Rui Lu
The mechanism of GO/rGO interaction with trypsin is investigated using multiple methods. UV-Vis reveals that trypsin has a maximum absorption at 278 nm, the absorption intensity increased demonstrating GO/rGO alters the solvent environment of trypsin and exposes the aromatic chromogenic groups. ITC experiments with GO and trypsin provide a negative ΔH of -25.98 KJ mol −1 and the association constant Ka of 4.829 × 10 −4 . The negative ΔS of -23.64 J mol −1 ∙K −1 is further given by the Gibbs–Helmholtz equation. Combining with the ζ potential result, the driving forces for binding include hydrogen bonding, electrostatic interaction forces and van der Waals forces. Fluorescence spectroscopy shows that GO/rGO can significantly quench the fluorescence intensities of trypsin. The equilibrium constant Kd of GO/ rGO-24h / rGO-48h is 4.41±0.07, 5.82±0.53, 7.24±0.25, respectively, which means the reduced content of oxygen-containing groups can weaken the binding forces between GO/rGO and trypsin. CD show that even low concentrations of GO/rGO affect the secondary structure of trypsin, mainly decreasing the α -helix and β -fold content while increasing the β -turn and random coil content of trypsin. Overall, GO/rGO can effectively interact with trypsin, the oxidation degree of GO/rGO can affects the combination of trypsin and further influence on protein conformation and function.
研究领域:
生物化学
·
分子生物学
·
蛋白质科学
✓ 已验证
DOI
RSC Advances
·
2016
·Vol. 6
·期 36
·30184-30193
·
IF 3.289
Yu Liu,Han Zhong,Yu Qin,Yan Zhang,Xinfeng Liu,Tao Zhang
Graphene oxide (GO) and reduced graphene oxide (RGO) are attractive materials due to their potential biomedical applications, especially as drug delivery vehicles because of their huge specific surface area. In the current study, GO and RGO were prepared. In addition, a perylene derivative, phosphorylcholine oligomer grafted perylene (Perylene-PCn), was synthesized following the atom transfer radical polymerization procedure. In order to determine their structures, the products were characterized carefully with Fourier transform infrared spectra, proton nuclear magnetic resonance, X-ray photoelectron spectroscopy, wide angle X-ray diffraction, thermogravimetric analysis, and atomic force microscopy etc. The properties including fluorescence and biocompatibility were also evaluated. Utilizing the π–π stacking interaction of RGO and the perylene moiety, water dispersible RGO/Perylene-PCn composites were fabricated and then investigated as a vehicle for anti-tumor paclitaxel (PTX). The anti-tumor effects of free PTX and PTX@RGO/Perylene-PCn were compared with an in vitro cytotoxicity assay. The results demonstrated that RGO/Perylene-PCn can be used as an anti-tumor agent delivery vehicle for potential oncology applications.
研究领域:
材料科学
·
生物医药工程
·
肿瘤学
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Lihong Sun,Hua Song,Yunzhen Chang,Wenjing Hou,Ying Zhang,Honggang Li,Gaoyi Han
Reduced graphene oxide (rGO) has tremendous importance due to its potential applications in electronics, catalysis and sensors. However, the properties of rGO are often affected by the impurity of manganese ions, and their removal from graphene oxide (GO) is time and labor-consuming due to their strong interaction with oxygen-containing groups of GO. In this paper, we use citric acid , sulfosalicylic acid and tartaric acid as competitive ligands to make manganese ions removal easy. The results show that under the same purifying conditions, the presence of competitive ligands can increase the purifying efficiency, and the lowest content of manganese is only one-third of that in GO without competitive ligands. The hydrogels and films of rGO have been prepared, and their properties such as capacitance and conductivity have also been evaluated. The results show that the microstructure of hydrogels is affected by the added ligands. The hydrogels prepared from GO which is purified in the presence of sulfosalicylic acid exhibit well-defined pore structure and the capacitive performance such as rate capability and the cycling stability is the best. It is proved that adding competitive ligands is an effective approach to remove manganese impurity in GO.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Han Jia,Pan Huang,Yugui Han,Qiuxia Wang,Xin Wei,Wenjian Huang,Jiajun Dai,Jinyong Song,Hui Yan,Dexin Liu
The interfacial activities of graphene oxide (GO) and two kinds of Janus graphene oxide (JGO150 and JGO400), i.e., GO with one side being modified by two different amount of dodecylamine, were evaluated in various oil/water systems. Based on the results of IFT measurement, JGO showed the greater interfacial activity than original GO, especially for JGO400 which greatly reduced the heavy oil/water IFT to 0.12 mN/m. Molecular dynamic simulations were employed to illustrate the interfacial interaction between GO/JGO and oil molecules. Furthermore, the interaction between three kinds of nano-sheet materials and three types of surfactants, including dodecyltrimethylammonium bromide (DTAB), sodium dodecyl sulfate (SDS), and Triton X-100 (TX-100), were systematically investigated in the heavy oil/water system. The JGO400/DTAB system exhibited excellent synergistic effects to dramatically decrease the heavy oil/water IFT to 8 × 10 −3 mN/m, which was responsible for its remarkable ability to improve heavy oil recovery (19.5%) in core flooding tests.
研究领域:
石油工程
·
材料科学
·
分子动力学
✓ 已验证
产品关联
DOI
高影响因子
Biomedical Physics & Engineering Express
·
2019
·Vol. 5
·期 2
·025002
·
IF 0
Orwa Shueibi,Ziyan Zhou,Xianliu Wang,Bingcheng Yi,Xing He,Yanzhong Zhang
Graphene oxide (GO) and reduced graphene oxide (rGO) are two of the most representative graphene derivatives that can be employed to engineer bioactive and/or electroactive scaffolds for neural tissue engineering (NTE). However, a comparison with regard to their chemical structural impact on cytocompatibility has yet to be performed. In this study, GO was prepared using a modified Hummers' method followed by thermal treatment to obtain the rGO. Thereafter, a stable jet electrospinning approach was used to electrospin a viscous mixed solution of polycaprolactone (PCL)/poly(ethylene oxide) (PEO) (mass ratio 4:1) containing a tiny amount of GO and rGO (1% w/w), for the generation of highly-aligned nanoscale fibers of PCL-PEO-GO and PCL-PEO-rGO, respectively. Structural characteristics and physicochemical properties of the GO and/or rGO incorporated PCL-PEO nanofibers were characterized by various analytical techniques including Raman, FTIR, SEM, water drop contact angle, cyclic voltammetry and tensile testing. Finally, biological study in vitro by culturing the fibrous scaffolds with murine Schwann cells for cytocompatibility evaluation demonstrated that comparatively PCL-PEO-GO scaffold could more favorably promote the proliferation of the Schwann cells. However, considering the noted higher electroconductivity, the fibrous PCL-PEO-rGO may be applied to induce stem cell differentiation towards neural lineage. This research could provide a guidance for judicious selection of the GO and rGO incorporated nanofibers to construct electroactive scaffolds for engineering functional neural tissues.
研究领域:
生物医学工程
·
神经组织工程
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）