INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Aisheng Huang,Bo Feng
Pristine graphene oxide (GO) sheets were pretreated with polyethyleneimine (PEI) to prepare PEI-modified GO (PEI-GO), which was further inserted with ZIF-8 crystals to form a novel PEI-GO@ZIF-8 nanocomposite for CO 2 capture. The good dispersion of PEI and interlayer growth of ZIF-8 within the GO sheets is helpful for high CO 2 adsorption. Therefore, the PEI-GO@ZIF-8 nanocomposite show high surface area and enhanced CO 2 adsorption capacity . The adsorption capacity of the PEI-GO@ZIF-8 nanocomposite was six times higher than that of the pristine GO and ZIF-8. The CO 2 /N 2 adsorption selectivity was significantly improved due to amine groups loading which provide more sites for CO 2 adsorption. The preferential adsorption of CO 2 over N 2 makes PEI-GO@ZIF-8 nanocomposite be a promising candidate in the field of CO 2 capture.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yuchao Shao,Menggang Bao,Weizhong Huo,Rong Ye,Muhammad Ajmal,Wenjing Lu
Acid hydrothermal treatment of biowaste is favorable for producing hydrochar and corresponding hydrothermal solution containing saccharides, furans and aromatic compounds, while the alkaline hydrothermal condition is beneficial for their humification to form hydrothermal humic acid (HHA). Herein, the humification potential of hydrochar, hydrothermal solution, and their mixture under alkaline hydrothermal conditions was compared to further reveal their contribution to HHA. The result showed the main source of HHA was hydrochar, occupying 70 wt% of total HHA yield from their mixture while hydrothermal solution only contributed 17 wt%. Moreover, the HHA that existed in hydrochar (denoted as HHA acid ) was 32 wt% while the hydrochar-derived HHA obtained after alkaline hydrothermal treatment (denoted as HHA alk ) increased to 65 wt%, close to that from commercial coal or lignite. The hydrochar was further separated into four components, i.e. hydrothermal fulvic acid (HFA), stable HHA acid (S-HHA acid ) non-stable HHA acid ( N -HHA acid ) and remaining substance (RS), aiming to reveal the major pathway of the incremental HHA production under alkaline hydrothermal condition. Reactions of RS + HFA, RS + N -HHA acid and self-synthesizing of RS all contributed to the incremental HHA alk yield with the major contribution (75C%) from the first combination (RS + HFA). The pathways of alkaline hydrothermal humification of hydrochar were revealed after analyzing the molecular level structure of HHA alk by UPLC-MS. This in-depth analysis fills the knowledge gap in the mechanism of hydrothermal humification of biowaste.
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Separations
·
2022
·Vol. 9
·期 12
·391
·
IF 3.344
Zhiquan Yang,Chong He,Wenning Liao,Xinyi Zhang,Wanhui Liu,Baosheng Zou
Dye effluent damaged the water environment and human health with its massive discharge. In order to eliminate dye from the water environment, a variety of adsorbents were used to investigate dye removal. Graphene oxide (GO) attracted extensive attention due to its excellent surface property in the degradation of dye wastewater. Modified GO with multifunctional groups helped to improve adsorption performance. 3-Aminopropyltriethoxysilane modified GO (AS-GO) was fabricated for the removal of Orange G (OG) in this study. The results showed that AS-GO had an excellent adsorption ability of OG. During the reaction process, the maximum adsorptive capacity of OG was up to 576.6 mg/g at T = 313 K and pH = 3 with the initial OG concentration of 100 mg/L and the initial adsorbent dose of 2.5 g/L. The adsorption kinetic process of AS-GO conformed to the pseudo-second-order and Langmuir models. The spontaneous and endothermic adsorption of OG occurred in the adsorption process. The main adsorption mechanisms were electrostatic, π–π and hydrogen bonding interactions in the reaction process. After four cycles of AS-GO, it maintained high removal efficiency owing to its remarkable stability. The scheme of GO modified with AS could hinder the agglomeration of GO and provide more active sites, which would further enhance the adsorption properties and expand its application in water purification.Keywords:adsorption;Orange G;graphene oxide;3-aminopropyltriethoxysilane
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Nanomaterials
·
2023
·Vol. 13
·期 4
·667
·
IF 5.3
Violeta Jevtovic,Afaq Ullah Khan,Zainab M. Almarhoon,Kamran Tahir,Salman Latif,Fahad Abdulaziz,Karma Albalawi,Magdi E. A. Zaki,Violeta Rakic
In this work, a manganese selenide/graphene oxide (MnSe/GO)-based composite was prepared for wet-chemical assisted method against organic dye; herein, methylene blue (MB) dye removal from the water was employed as a metal selenide-based photocatalyst. The synthesized MnSe/GO composite was systematically characterized by X-ray diffraction (XRD), Fourier transform electron microscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and UV-visible diffuse reflectance spectroscopy (UV-vis. DRS). The structural characteristic revealed the adequate synthesis of the sample with good crystallinity and purity of the obtained products. The morphological analysis indicates the formation of MnSe nanoflakes composed of tiny particles on their surface. At the same time, the GO nanosheets with high aggregation were formed, which may be due to the van der Waals forces. The bond interaction and compositional analysis studies confirmed and supported the structural findings with high purity. The optical analysis showed the bandgap energies of MnSe and their composites MnSe (1.7 eV), 7% GO-MnSe (2.42 eV), 14% GO-MnSe (2.6 eV), 21% GO-MnSe (3.02 eV), and 28% GO-MnSe (3.24 eV) respectively, which increase the bandgap energy after GO and MnSe recombination. Among different contents, the optimized 21% GO-MnSe composite displayed enhanced photocatalytic properties. For instance, a short time of 90 min was taken compared with other concentrations due to the narrow bandgap of MnSe and the highly conductive charge carrier’s support, making the process to remove MB from water faster. These results show that the selenide-based photocatalyst can be an attractive candidate for future advanced photocatalysis applications.Keywords:manganese selenide;GO;methylene blue;organic dye;catalytic activity
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 27
·41776-41787
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IF 5.19
Huang Jialei,He Jingjing,Xu Keneng,Xiang Yali,Luo Yan
Owing to high treatment efficiency under neutral condition and no extra energy required, copper-mediated activation of persulfate (PS) has been widely used for the degradation of refractory organic pollutants in water. The dispersion stability of copper nanoparticle in water, however, remains a great challenge. Meanwhile, chemical oxidative modification of graphene oxide (GO) can improve the dispersion stability of GO in water. In this paper, cuprous oxide (Cu 2 O) was deposited on the surface of GO. GO/Cu 2 O nano-composites with different mass ratios, i.e., m (GO): m (Cu 2 O) of 1:2, 1:5, 1:10, and 1:25, were prepared. When m (GO): m (Cu 2 O) was 1:2, the amount of GO/Cu 2 O nano-composite was 1.00 g/L and C PDS : C DCF was 15:1, and the catalytic degradation rate of diclofenac (DCF) was up to 90%. Corresponding physicochemical properties of the resulting samples were comprehensively characterized by using SEM, TEM, XRD, Raman, FT-IR, and XPS. DCF degradation by activating peroxydisulfate (PDS) via GO/Cu 2 O nano-composite was also investigated in detail. It is found that the synergistic effect, namely GO adsorption and multivalent copper ion electron transfer, makes GO/Cu 2 O nano-composite reveal higher reactivity. Moreover, GO/Cu 2 O nano-composite possesses good stability in consecutive cycling test. EPR analyses shows that ·OH and SO 4 ·− radicals are involved in DCF degradation. It is indicated that the DCF degradation process contain hydroxylation and the cleavage of C-N bond, which is explored by GC–MS. In our research, well-dispersed GO/Cu 2 O nano-composite with high capacity and good cycling stability was fabricated successfully. Compared with pure Cu 2 O nanoparticle, GO/Cu 2 O nano-composite exhibits the better performance for DCF removal. Graphical abstract A novel well-dispersed cuprous oxide (Cu 2 O) deposited on surface of GO was fabricated with high catalytic performance. Its heterogeneous activation of peroxydisulfate (PDS) for diclofenac (DCF) degradation was investigated. GO/Cu 2 O nano-composite was proved high capacity and good cycling stability. Meanwhile, the possible DCF degradation pathway was explored. Compared with pure Cu 2 O nanoparticle, GO/Cu 2 O nano-composite exhibits better performance for DCF removal.
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Membranes
·
2022
·Vol. 12
·期 8
·803
·
IF 4.562
Na Meng,Pinping Zhao,Wei Zhou,Jie Yan,Die Hu,Yanqing Fang,Jun Lu,Qiang Liu
Graphene oxide (GO) membranes have attracted significant attention in the field of water processing in recent years due to their unique characteristics. However, few reports focus on both membrane stability and the “trade-off” effect. In this study, a series of aliphatic diamines (1, 2-ethylenediamine, 1, 4-butanediamine, and 1, 6-hexamethylenediamine) of covalent crosslinked GO were used to prepare diamine-modified nanofiltration membranes, BPPO/AX-GO, with adjustable layer spacing using the vacuum extraction–filtration method. Moreover, Ax-GO-modified nanofiltration membranes modified with adipose diamine had higher layer spacing, lower mass-transfer resistance, and better stability. When the number of carbon atoms was 5, the best layer spacing was reached, and when the number of carbon atoms was greater than 4, the modified membrane nanosheets more easily accumulated. With the increase in layer spacing, the water flux of the composite film increased to 26.27 L/m2·h·bar. Meanwhile, adipose diamine crosslinking significantly improved the stability of GO films. The interception sequence of different valence salts in the composite membrane was NaCl > Na2SO4> MgSO4, and the rejection rate of bivalent salts was higher than that of monovalent salts. The results can provide some experimental basis and research ideas for overcoming the “trade-off” effect of a lamellar GO membrane.Keywords:graphene oxide;layer-spacing control;nanofiltration membrane;separation of function
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Environmental Science and Ecotechnology
·
2021
·
IF 0
Guanhan Chen,Wenyi Dong,Hongjie Wang,Zilong Zhao,Feng Wang,Feifei Wang,Cesar Nieto-Delgado
Carbamazepine (CBZ), as one of the most frequently detected pharmaceuticals, is of great concern due to its potential impact on the ecosystem and human health. This study provides an effective approach to remove CBZ by using photocatalyst silver phosphate combined with graphene oxide (Ag 3 PO 4 /GO) under visible irradiation. The morphology, composition, and optical properties of Ag 3 PO 4 /GO were characterized employing SEM, XRD, and DRS. Graphene oxide could improve the visible-light utilization and promote electron's charge to enhance the photocatalytic performance of Ag 3 PO 4 /GO. With the optimal reaction condition of 5.86 mW/cm 2 light intensity, 15–25 °C temperature, 5–7 pH, and 0.5 mg/L catalytic dosages, 5 mg/L CBZ could be completely degraded in 30 min, and the apparent rate constant could reach 0.12 min −1 . Additionally, the radical trapping experiments indicated •OH and O 2 ˉ• were the main reactive oxygen species employed to eliminate CBZ. The decay pathways of CBZ had been proposed accordingly, and the main product was the low-molecular products.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2021
·
IF 6.064
Ying Yang,Kai Chen,Liang Huang,Min Li,Taiping Zhang,Mi Zhong,Ping Ning,Junya Wang,Shikun Wen
It has been reported that the addition of graphene oxide (GO) can increase the dispersion and heterogeneous nucleation of layered double hydroxide (LDH), thus providing more active sites, which is more conducive to CO 2 adsorption. Herein, we reported alkali metal nitrates ((Li 0.3 Na 0.18 K 0.52 )NO 3 ) promoted LDH and GO composites (LDH/GO) as adsorbents for CO 2 capture. The influence of mass ratio of LDH to GO, the impregnation ratio of alkali metal nitrates, the calcination and adsorption temperature, as well as the cycling stability were investigated systematically. The results indicated that the CO 2 capture capacity of LDH/GO composite with 30 mol% (Li 0.3 Na 0.18 K 0.52 )NO 3 could reach 4.51 mmol·g −1 , which was 5.86 times higher than LDH/GO1 without loading alkali metal nitrates. Moreover, it had outstanding CO 2 adsorption capacity in the range from 200 °C to 320 °C. In addition, the cyclic adsorption and desorption test manifested that the CO 2 uptake of the material can reach 3.07 mmol·g −1 after 22 cycles. We believe that this study will give a significant contribution to fabrication of LDH based composites as CO 2 adsorbents in future study.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Dan Li,Feigao Xu
ZIF-8@GO-X (X = 0, 2.48%, 4.07%, 7.83%, and 20.03%) composites were prepared using GO and ZIF-8. The composites were used to absorb Cu(Ⅱ) from aqueous solutions. With increasing GO content, the adsorption of the ZIF-8@GO-X composites first increased and then decreased. The Cu(Ⅱ) adsorption of ZIF-8@GO-7.83% reaches a maximum among ZIF-8@GO-X composites (X = 0, 2.48%, 4.07%, 7.83%, and 20.03%). The adsorption kinetics , adsorption isotherm , adsorption thermodynamics, and adsorption mechanism of Cu (II) by ZIF-8@GO-7.83% were studied in this paper. The results showed that the adsorption reached equilibrium at 120 min, and ZIF-8@GO-7.83% approached equilibrium relatively quickly. When the temperature was 45 °C and the Cu(Ⅱ) concentration was 40 mg/L, the maximum adsorption capacity of ZIF-8@GO-7.83% for Cu(Ⅱ) reached 482.29 mg/g. The equilibrium data and kinetics were well described by Langmuir and pseudo-first-order models, respectively. Final experiments with real factory wastewater (initial Cu(Ⅱ) concentration of 670 mg/L) revealed that 0.37 g/L ZIF-8@GO-7.83% can efficiently reduce the Cu(Ⅱ) concentration to below 2 mg/L.
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RSC Advances
·
2021
·Vol. 11
·期 17
·9977-9984
·
IF 3.361
Fuhua Wei,Qinhui Ren,Huan Zhang,Lili Yang,Hongliang Chen,Zhao Liang,Ding Chen
Zirconium-iron metal–organic frameworks (Zr/Fe-MOFs) and Zr/Fe-MOF/graphene oxide (GO) composites were prepared via solvothermal synthesis using ferrous sulfate heptahydrate, zirconium acetate, and 1,3,5-benzenetricarboxylic acid. The MOFs and composites were measured using scanning electron microscopy (SEM), infrared spectrometry (IR), and thermogravimetric analysis (TGA). In this study, we explored the ability of Zr/Fe-MOFs and Zr/Fe-MOF/GO composites to adsorb tetracycline hydrochloride from an aqueous solution. Additionally, we optimized the adsorption performance by varying the ratio of MOFs and MOF composites to tetracycline hydrochloride solution, the concentration of tetracycline hydrochloride solution, and the pH of the solution. The results were investigated and fit to both pseudo-first-order and pseudo-second-order kinetic models. The results of the Freundlich and Langmuir isotherm models indicate that Zr/Fe-MOFs and Zr/Fe-MOF/GO composites have heterogeneous adsorption surfaces and that tetracycline hydrochloride is adsorbed over Zr/Fe-MOFs and Zr/Fe-MOF/GO by multilayer adsorption. Overall, our findings indicate that Zr/Fe-MOFs and Zr/Fe-MOF/GO composites can effectively treat wastewater, providing an inexpensive alternative to other methods.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 14
·18591-18604
·
IF 2.478
Zhang Shengsheng,Huang Fanglin,Zhong Mingqiang,Fan Ping
Dielectric material is an important material for film capacitors. However, the progress of this material is either impeded by its low dielectric constant, high loss tangent, or insufficient flexibility. In this work, PVA/GO film with alternating layer structure was fabricated by Spin-Coating-Assembly (SCA) method. This alternating layer structure not only benefits forming numerous microscale capacitors which improve ε value a lot, but also helps eliminate perpendicular contact of GO and prevents the formation of conductive pathways. Thus, compared with pure PVA, significantly increased dielectric permittivity and a low loss tangent were simultaneously observed for the PVA/GO film. The ratio of dielectric permittivity to loss tangent increased from 68 to 165. These films might be potential flexible dielectric materials for advanced electrical devices such as embedded capacitors.
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Polymers
·
2021
·Vol. 13
·期 11
·1688
·
IF 4.329
Ao Gu,Jian Wu,Liming Shen,Xiaoyan Zhang,Ningzhong Bao
The uniform dispersion of graphene oxide (GO) and strong interfacial bonding are the key factors in achieving the high mechanical strength of GO/polymer composites. It is still challenging to prepare GO/PA66 composites with uniform GO dispersion by the in situ polymerization method. In this paper, we prepare GO/PA66 salt nanocomposite by in situ precipitating PA66 salt with GO in ethanol. The GO/PA66 nanocomposite fibers are then fabricated using the as-prepared GO/PA66 salt by in situ polymerizing and melt spinning. By tuning the GO content, the tensile strength and Young’s modulus of the GO/PA66 fibers are increased from 265 ± 18 to 710 ± 14 MPa (containing 0.3 wt% GO) and from 1.1 ± 0.08 to 3.8 ± 0.19 GPa (containing 0.5 wt% GO), respectively. The remarkable improvements are attributed to the uniform dispersion of GO in the GO/PA66 salt nanocomposite via ionic bonding and hydrogen bonding in the in situ precipitation process, and the covalent interfacial bonding between the GO and PA66 during the in situ polymerization process. This work sheds light on the easy fabrication of high-performance PA66-based nanocomposites.Keywords:Polyamide 66;GO;in situ precipitation;dispersion;mechanical properties
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