LANGMUIR
·
2024
·
IF 3.7
Jing Zhang,Changhua Li,Xiaofeng Zhang,Hao Chen,Rui Gou,Chao Zhang,Dan Sun,Yi He
The use of graphene-based materials as anticorrosion coatings to protect metals is always a topic of discussion. In this work, silicon nitride (Si3N4) was aminated to improve its water dispersibility. Then it is attached to the graphene oxide (GO) surface to improve compatibility with epoxy (EP) resin as well as conductivity. The results of Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and zeta potentials test analyses indicated that Si3N4–NH2@GO with a layer-point structure has been successfully prepared. The corrosion resistance of the composite coatings was characterized by electrochemical impedance spectroscopy (EIS) and polarization curve analysis, and the wear resistance of the composite coatings was tested by friction and wear tests. The results showed that 1.0% Si3N4–NH2@GO has excellent corrosion and wear resistance. The use of Si3N4–NH2@GO layer point structures in this study broadens the way for GO applications.
研究领域:
材料科学
·
防腐蚀技术
·
表面工程
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Xiaodi Liu,Haikuan Yuan,Chengcong Wang,Shuai Zhang,Lijuan Zhang,Xijian Liu,Fengjiao Liu,Xueyan Zhu,Sohrab Rohani,Chibun Ching,Jie Lu
In this work, PFSA-g-GO nanocomposites were firstly prepared by perfluorosulfonic acid (PFSA) grafted on graphene oxide (GO) in various mass ratios through an esterification reaction. Then a series of PVDF/PFSA-g-GO ultrafiltration (UF) membranes were constructed by a non-solvent induced phase separation (NIPS) method using the obtained diverse PFSA-g-GO nanocomposites as additives in different dosages. PFSA-g-GO nanocomposites and PVDF/PFSA-g-GO membranes were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), water contact angle, etc. The UF performance was examined using the separation of bovine serum albumin (BSA) and humic acid (HA) as a model system. The results showed that, compared with those of PVDF membrane, the permeability and the antifouling capacity of proposed PVDF/PFSA-g-GO membranes were enhanced. For example, the pure water flux of membrane M4 (PFSA:GO mass ratio of 2.5:1, fraction of PFSA-g-GO in dope solution of 0.5 wt%) was 1.5 times higher than that of PVDF membrane, but in the meantime, the rejection of BSA and HA was up to 93.9% and 79.6%, respectively. In general, the presence of PFSA-g-GO nanocomposites in dope solutions increased the hydrophilicity and decreased the roughness of membrane surfaces, and meanwhile increased the porosity and the pore size of membranes, which was dependent upon the content and the PFSA to GO mass ratio of nanocomposites in membranes.
研究领域:
材料科学
·
环境工程
·
生物技术
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产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 1
·e202403550
·
IF 2
Qiulin Deng,Yuling Zhang,Xuanzhe Liao,Qianru He,Boli Zeng,Hong Luo,Lianjun Shi,Jinlong Jiang,Faqin Dong
Graphical In this study, the ZIF-8/GO composite was successfully prepared by the one-pot method and applied to the highly efficient removal of CR from high-concentration saline wastewater. The maximum removal ratio was up to 98%. Meanwhile, it was revealed that the removal of CR by ZIF-8/GO depended on hydrogen bonding, electrostatic interaction, and π-π stacking. Dye wastewater is high-concentration salt-containing chemical wastewater. It contains numerous toxic pollutants that are difficult to degrade, and its direct discharge without treatment will cause serious environmental problems. Herein, ZIF-8/GO adsorbent was prepared by the one-pot method to purify wastewater containing Congo red dye (CR). ZIF-8/GO possessed an S BET of 70.252 m 2 /g, pore volume of 0.036 cm 3 /g, and pore size of 3.22 nm. Adsorption experiments of ZIF-8/GO were performed based on various parameters, such as pH, concentration, dose, temperature, and salt concentration. The results showed that the adsorption capacity of ZIF-8/GO was better than ZIF-8 and GO for CR, which the adsorption process of 0.1-ZIF-8/GO (10.0 mg) for CR (50 mg/L) reached equilibrium in 60 min at 35 °C under the high-salt parameter (10 g/L NaCl). And the maximum removal ratio was up to 98%. Adsorption data were fitted using the Langmuir, and Freundlich isotherm models and pseudo-first-order, pseudo-second-order kinetics model and liquid film diffusion model, intra-particle diffusion model. The results indicated that the quasi-second-order kinetic model and Freundlich model were more suitable to describe the adsorption process for the removal of CR by ZIF-8/GO. ZIF-8/GO possesses a high removal ratio and it has promising applications in high-concentration salts-containing wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Nannan Geng,Wei Chen,Hang Xu,Tao Lin,Mingmei Ding,Yi Wang,Hui Tao,Kai Hu
In order to remove the humic acid (HA) from the drinking water efficiently, novel quaternary Fe 3 O 4 /TiO 2 –N-GO (FTNG) sonocatalysts with different amounts of Fe 3 O 4 were simply synthesized, and a sono-photocatalytic system was used by combining photocatalysis and ultrasound processes. A series of characterizations were performed to confirm the successful synthesis of FTNG and some of its properties, and the results showed that FTNG with an appropriate amount of Fe 3 O 4 can extend the range of light absorption to over 400nm (UV-vis spectra) and improve the separation efficiency of electrons and holes (Photocurrent responses). Raman spectra indicated the reduction of GO. Sono-photocatalytic performance was investigated under visible light irradiation and the effect of ultrasound was studied. Among all the catalysts, FTNG-0.2 with 0.2 g Fe 3 O 4 , exhibited the best HA removal abilities, about 80% for sono-adsorption and 93% for sono-photocatalysis. The removal efficiency in sono-photocatalytic system was about 42% higher than only adsorption and 26% higher than only photocatalysis. Finally, we proposed the possible reaction mechanisms. First, ultrasound pretreatment had a positive effect on HA removal, and a Fenton-like system was then established with H 2 O 2 produced by cavitation effect. Second, the doping of Fe 3 O 4 , N and GO improved the quantum efficiency. The improvement of visible light catalytic performance is mainly attributed to the doping of N. This work is significant for the field of ultrasonic and catalytic degradation, especially for the removal of humic acid in drinking water.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhiying Li,Zhiwei Li,Ning Zhang,Junjiang Bao,Xiaopeng Zhang,Gaohong He,Cong Chen,Yongchen Song
Ultrathin and defect-free MOF membranes are actively pursued to realize high-performance hydrogen purification and carbon capture, which are of great significance for energy conservation and environmental sustainability. Zeolitic imidazolate framework-67 (ZIF-67) possesses exceptional pore apertures for sieving hydrogen from other larger gases. However, the preferential heterogeneous nucleation and growth of ZIF-67 crystals greatly challenge the synthesis of ZIF-67 membranes. In this work, a tunable-reaction-zone contra-diffusion synthesis is proposed to effectively assemble ZIF-67 nanocrystals into ultrathin GO laminates. The contra-diffusion-match growth of ZIF-67 constructs a compact ZIF-67@GO hybrid structure with superior H 2 /CO 2 separation factor of 140.8 and H 2 permeance of 1.7 × 10 −7 mol m −2 s −1 Pa −1 , transcending the state-of-art upper bounds. The excellent separation performance is attributed to the collaborative effect of the size-sieving and the selective attraction of the ZIF-67@GO hybrid structure. Long-term operation also reveals the superior stability of the ZIF-67@GO hybrid membrane for H 2 /CO 2 separation. The rational-design approach grants a novel way to fabricate ultrathin and defect-free ZIF-67 crystalline membranes for high-performance gas separation.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Cuiling Ai,Sikai Yang,Fan Zhang,Xiangwen Shao,Junge Xu
Ag/AgCl-GO composite was fabricated by deposition–precipitation method and photoplasmic reduction method at room temperature. The resulting products were characterized by XRD, XPS, SEM, TEM, Zeta potential and UV–Vis DRS. The results indicated that the samples were composed of Ag, AgCl and graphene oxide (GO). During the photoreduction, the crystallinity of Ag 0 particles gradually increased with prolonging the time of UV irradiation, then remained stable after 90 min. The addition of GO had little effect on the crystal structure of Ag/AgCl, however, this reduced the particle size and enhances the dispersibility of the composite. After 100 min of visible light irradiation, the degradation efficiency of rhodamine B (RhB) reached 98.43%. Therefore, the Ag/AgCl-GO photocatalyst exhibited significant photocatalytic activity during the degradation of RhB under visible light.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 16
·A3738
·
IF 3.662
Bingbing Hu,Qin Xiang,Yuan Cen,Sha Li,Lijun Liu,Danmei Yu,Changguo Chen
In this work, uniform wrinkle V2O5@GO flexible thin films have been successfully synthesized via a facile drop-casting and annealing process from the composite sol-gel. It is found that VG8 composite thin film with an appropriate mass ratio (8:1) of V2O5 and GO shows an outstanding specific capacitance of 397 F g−1 at a current density of 1 A g−1, high-class rate capability (77%) and good cycling stability with 98% capacitance retention over 2000 cycles at a current density of 5 A g−1, which is much superior than pure V2O5 thin film electrode. A full solid-state symmetric energy storage device is assembled using the VG8 composite thin film, exhibiting high energy density of 17.66 Wh kg−1 at a power density of 249.9 W kg−1, as well as excellent cycling stability (89.3% capacitance retention after 5000 cycles). Impressively, three charged device in series can light up a yellow light emitting diodes (LEDs), demonstrating its potential in futher energy storage applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Fang Cao,Juan Shen
Using polyethylenimine-modified carboxylmethyl konjac glucomannan as a matrix and graphene oxide as nanofillers, a novel porous biocomposite named as PCGt was synthesized by a facile chemical cross-linking method. The structure of prepared PCGt was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and X-ray photoelectron spectroscopy. Batch adsorption experiments was designed to exploit key factors on Pb(II) removal such as the pH, dose, contact time, initial concentration, and temperature. According to the data from pseudo-second-order kinetic and Freundlich isotherm models, the adsorption process was controlled by chemisorption and occurred on heterogeneous surfaces. The maximum adsorption capacity of PCGt on Pb(II) was up to 977 mg g–1 at 303.15 K. In thermodynamic analysis, positive enthalpy change and negative Gibbs free energy change exposed that the adsorption was endothermic and spontaneous at 308.15 K. The recyclability of PCGt was confirmed by leaching and desorption experiments. The adsorption mechanism was proposed that the chemical complexation between Pb(II) with the functional groups on PCGt. All outcomes effectively revealed that the biocomposite PCGt was a good candidate to remove Pb(II) from aqueous solution for the waste disposal industry.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Jiaqi Zhang,Jin Li,Xiangyu Liu
The degradation of organic dyes and other pollutants has always been one of the great challenges facing mankind today. So our work designed and improved a novel composite, by using zinc oxide (ZnO) nanoparticles to modify porous carbon nitride (g-C 3 N 4 ), and then load graphene oxide (Go) nanosheets . These prepared binary and ternary composites with different weight ratios were subjected to a series of tests. The results showed that when the weight ratio of g-C 3 N 4 was 40%, the binary composite ZnO-g-C 3 N 4 transferred its absorption edge to lower energy and had the best photocatalytic performance. Moreover, the addition of Go immensely cut down the recombination of photo-generated carriers and enhanced the absorption in the visible light range. The ZnO-g-C 3 N 4 (40%)-Go (15%) displayed 98% degradation efficiency in 100 min, the rate was about 2.23 times than ZnO-g-C 3 N 4 (40%). XRD , XPS, TEM proved the successful hybridization of the composite, and PL explained the causes for the amendment of photocatalytic efficiency. The conduction band and valence band potential of the material were calculated by VB-XPS, and combined with the free radical capture experiment proved the most effective free radical in this experiment and proved the reaction mechanism of the photocatalytic reaction. Through the photocurrent and EIS the results analyzed the high responsivity of the material and the low photogenerated e − /h + recombination rate. In brief, the interface effect and synergistic effect of the ternary heterojunction greatly enhanced the photocatalytic degradation of toxic dyes.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
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.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 30
·期 2
·351-359
·
IF 2.137
Jinying Du,Yu Tian,Ning Li,Jun Zhang,Wei Zuo
In order to improve the antifouling performance of PVDF membrane, a novel zinc sulfide/graphene oxide/polyvinylidene fluoride (ZnS/GO/PVDF) composite membrane was prepared by immersed phase inversion method. The surface morphology, crystal structure, photocatalytic activity, and antifouling property of the as-prepared membranes were systematically studied. Results showed that the ZnS/GO/PVDF hybrid membranes were successfully fabricated with uniform surface. The hybrid membrane surface possessed higher hydrophilicity with water contact angle decreasing from 77.1° to 62.2°. The permeability of the hybrid membrane was therefore enhanced from 222.9 to 326.1 L/(m 2 hour). Moreover, bovine serum albumin (BSA) retention experiment showed that the hybrid membrane separation was also promoted by 7.2%. The blending of ZnS and GO enhanced the hydrophilic and photocatalytic performances of PVDF membrane, which mitigated the membrane fouling effectively. This novel hybrid membrane could accelerate the practical application of photocatalytic technology in membrane separation process.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
DOI
高影响因子
Crystals
·
2024
·Vol. 14
·期 6
·508
·
IF 2.4
Sumei Li,Jian Ji,Saisai Shan,Sha Chen,Hanbing Li,Qian Xu,Yixuan Liang
Tetrabromobisphenol A (TBBPA) is a kind of widely used brominated flame retardant (BFR), which is proven to be harmful to ecological systems and public health. It is very important to remove TBBPA from the environment. In our study, a magnetic composite named Fe3O4/GO/ZIF-67 was synthesized by a coprecipitation method and applied in the highly efficient adsorption of TBBPA from water. Static adsorption experiments demonstrated that the adsorption capacity could reach 232 mg·g−1within 120 min, which is much higher than those reported in the other literature. The experimental results show that the adsorption of TBBPA on Fe3O4/GO/ZIF-67 followed Langmuir and pseudo-second-order kinetic adsorption models. The main mechanisms for these adsorptions were identified as hydrogen bonds between OH groups in TBBPA and COOHs of Fe3O4/GO/ZIF-67, and π-π stacking between Fe3O4/GO/ZIF-67 and TBBPA. This study provides a method with great promise for the design and synthesis of better adsorbents for the removal of TBBPA from the water environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）