NUCLEAR TECHNOLOGY
·
2024
·
IF 1.5
Jianwei Zhang,Tuo Li,Bo Tian,Jinfeng Li,Wenze Li,Abdullah,Nan Zhang,Hongtao Zhao
Adsorption is widely regarded as the most promising method for uranium extraction. Among the various materials that have been studied, graphene oxide (GO) has attracted intensive interest because of its large specific surface area and abundant oxygen-containing functional groups. However, the layers tend to aggregate owing to pronounced Van der Waals forces, which reduce the surface area and diminish the likelihood of contact between uranyl ions and adsorption sites. Graphite oxide is an intermediate product of GO, with a simple preparation process and low cost. In this study, graphite oxide nanosheets (GONs) were synthesized using graphite oxide powder as the raw material and the NaOH activation method. GONs possessed a larger specific surface area and more carboxyl groups, which resulted in an excellent uranium adsorption capacity. The maximum adsorption capacity was found to be 578.0 mg·g−1, and the adsorption rate was 90.8% within 30 min. The adsorption process closely resembled the pseudo-second-order model and the Langmuir model. The mechanism of uranium adsorption by GONs was the synergistic coordination of -COOH and -OH with U(VI). This research suggests that the novel uranium adsorbent GONs can be applied to efficiently capture U(VI) from radioactive wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
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2016
·Vol. 230
·期 12
·1711-1718
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IF 1.183
Ning Xiang,Jiguo Huang,Honggang Zhao,Chengjia Liu,Xingjuan Liu
A green and simple chemistry approach was demonstrated to prepare reduced graphene oxide (rGO) using sodium humate (SH) as the reducing agent. Without using toxic and harmful chemicals, this method is environmentally friendly and suitable for the large-scale production of graphene. At first, the improved Hummers method to oxidize graphite for the synthesis of graphene oxide (GO) was applied, and then the as-prepared GO was reduced by SH to form rGO. Characterization was performed using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectrometry (XPS) and Raman spectra. The intensity ratio of the D and G band (I D /I G ) of GO after reduction with SH increases from 0.96 (GO) to 1.11 (rGO), the results obtained from the Raman spectra proved high purity of the final products.
研究领域:
材料科学
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环境化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Feng Xu,Ying Yu,Jian Yan,Qibin Xia,Haihui Wang,Jing Li,Zhong Li
An ultrafast synthesis method is developed for the preparation of composites of graphite oxide and HKUST-1, GrO@HKUST-1. Fast synthesis of GrO@HKUST-1 composites can be quickly achieved at room temperature within 1 min. The synthesized composites were characterized by XRD, SEM, N 2 adsorption, FTIR and TGA. The isotherms of CO 2 and N 2 on the as-synthesized materials were measured and the isosteric heats of CO 2 adsorption were estimated. The CO 2 /N 2 adsorption selectivities were predicted by means of ideal adsorbed solution theory (IAST). Results show that the GrO@HKUST-1 composites have higher BET surface area and pore volume than the parent HKUST-1. The CO 2 adsorption capacity of 2GrO@HKUST-1 (2% of GrO) is up to 9.02 mmol/g at 1 bar and 273 K, giving an increase of 32% in comparison of the parent HKUST-1. The isosteric heat of CO 2 adsorption on 2GrO@HKUST-1 is slightly higher than that of HKUST-1, suggesting the stronger interaction between CO 2 molecules and 2GrO@HKUST-1. The CO 2 /N 2 adsorption selectivity of 2GrO@HKUST-1 is significantly enhanced over pristine HKUST-1. At 1 bar, the CO 2 /N 2 adsorption selectivity of 2GrO@HKUST-1 is up to 186, while that of parent HKUST-1 is only 103. This rapid room temperature synthesis route is promising for new MOF-based composites.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Shuai Sun,Lei Wang,Han Xu
Reduced graphite oxide membrane (RGOM) with different thickness were prepared and used as electric double layer capacitor (EDLC) electrodes with aqueous electrolyte. According to quantum and molecular dynamic simulations, it was difficult for K + and OH − to diffuse into graphene sheets due to dense structure, which made the RGOM electrodes show poor EDLC behaviors. Electrochemical tests showed that controlling the thickness of electrodes and modifying the dense structure could improve the specific capacitance of EDLC. Further studies indicated that during galvanostatic charge/discharge processes, if the EDLC were heated at 70 °C for one cycle and then cooled down to room temperature, the specific capacitance could be increased further. Additionally, according to 10,000 times cycling tests at 5000 mA g −1 , the improved capacitance could be maintained for long time (154–167 F g −1 during test process), indicating that the hot activation could make RGOM electrodes obtain good and stable EDLC performances.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
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IF 4.513
Xiaoman Lei,Xiaolong Li,Zhiqiang Ruan,Tingmei Zhang,Fei Pan,Qiang Li,Dongsheng Xia,Jie Fu
Aiming at synthesizing titanate-based photocatalysts with high adsorption capacity and enhanced photocatalytic activity for dyes treatment, a new type of graphite oxide grafted titanate nanotubes (TNTs@GO) was prepared through a one-step hydrothermal method and characterized by a series of techniques including HRTEM , XRD , FTIR , XPS, etc. At the optimal GO loading (1 wt%), calcination temperature (300 °C) and time (0.5 h), TNTs@GO showed the highest photocatalytic activity for degrading Methylene Blue (MB, a model dye) under UV irradiation . Approximately 97.5% of MB was removed by TNTs@GO with 30-min pre-adsorption and 90-min UV irradiation. Radical scavengers quenching tests and electron paramagnetic resonance (EPR) measurements demonstrated several reactive species, i.e., h + , OH and O 2 - , played the critical roles in the photocatalytic process, and the presence of oxygen vacancy in TNTs@GO reduced the recombination rate of electron-hole pairs, thereby improving the photocatalytic activity. The effects of operational parameters were investigated, including TNTs@GO dosage, initial MB concentration, temperature, initial pH, humic acid and inorganic anions . Moreover, TNTs@GO showed a good reusability and applicability for multi-types of dyes. Therefore, TNTs@GO is a promising photocatalyst for dye wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 15
·2107083
·
IF 32.086
Chuanren Ye,Gang Wang,Hong Yuan,Jieyun Li,Kun Ni,Fei Pan,Minghao Guo,Yanhong Wu,Hengxing Ji,Fan Zhang,Bill Qu,Zhiyong Tang,Yanwu Zhu
Graphite oxide and its exfoliated counterpart, graphene oxide, are important precursors for the large-scale production of graphene-based materials and many relevant applications. The current batch-style preparation of graphite oxide suffers from safety concern, long reaction time, and nonuniform product quality, due to the large volume of reactors and slow energy exchange. Reaction in microchannels can largely enhance the oxidization efficiency of graphite due to the enhanced mass transfer and extremely quick energy exchange, by which the controllable oxidization of graphite is achieved in ≈2 min. Comprehensive characterizations show that the graphene oxide obtained through the microfluidic strategy has features like those prepared in laboratory beakers and industrial reactors, yet with the higher oxidization degree and more epoxy groups. More importantly, the microfluidic preparation allows for on-line monitoring of the oxidization by Raman spectroscopy, ready for the dynamical control of reaction condition and product quality. The capability of continuous preparation is also demonstrated by showing the assembly of fibers and reduction of graphene oxide in microfluidic channels, and the applicability of graphene oxide prepared from the microfluidic strategy for thermally and electrically conductive films.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Dan-Dan Zu,Lei Lu,Xiao-Qin Liu,Dong-Yuan Zhang,Lin-Bing Sun
This paper aims to improve the hydrothermal stability and catalytic activity of metal–organic frameworks (MOFs), which are believed to play an important role in the practical applications of MOFs in catalysis. Our strategy is to incorporate graphite oxide into a typical MOF, namely HKUST-1 (Cu3(BTC)2, BTC = 1,3,5-benzenetricarboxylic acid; HKUST = Hong Kong University of Science and Technology), and the properties of MOF are successfully tailored by use of this strategy. The obtained MOF/graphite oxide composites show enhanced porosity with high surface areas and some meso/macropores. For the composite containing 8.7 wt % of graphite oxide, the surface area reaches 1257 m2 g–1, which is obviously higher than pure HKUST-1 (841 m2 g–1). The pore structure of composites favors the access of reactant molecules to active sites and accelerates mass transfer in channels. Furthermore, the incorporation of graphite oxide creates a more hydrophobic environment surrounding metallic sites, which prevents the coordination bonds from attacking by water molecules and presents better affinity of active sites to organic reactants. Hence, the hydrothermal stability of MOF as well as the catalytic performance with regard to both activity and reaction rate are greatly improved. For the composite incorporating 8.7 wt % of graphite oxide, the conversion of styrene oxide in the ring-opening reaction can reach 74.1% after reaction for only 20 min, which is much higher than pure HKUST-1 (10.7%). More importantly, the catalytic activity can be well recovered without any loss even after six cycles. The excellent hydrothermal stability, catalytic activity, and reusability make our materials highly promising for use as heterogeneous catalysts in practical applications.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Hui Peng,Yaya Lv,Ganggang Wei,Jiezi Zhou,Xiaojie Gao,Kanjun Sun,Guofu Ma,Ziqiang Lei
Although the hydrogel electrolytes for flexible energy-storage device have made great progress, it still remains a huge challenge to assemble a smart supercapacitor with high ionic conductivity and excellent self-healing when suffering physical damage. Herein, a novel self-healing hydrogel electrolyte (B-PVA/KCl/GO) is designed and prepared through graphite oxide (GO) doped into a diol-borate ester bonding cross-linked poly(vinyl alcohol) network. It is found that the moderate amount of GO-doped into hydrogel (2.3 wt% GO , 47.5 mS/cm) is obviously improved ionic conductivity compared with bare B-PVA/KCl hydrogel (32.6 mS/cm). Interestingly, the B-PVA/KCl/GO hydrogel electrolyte exhibits excellent self-healing capability that can repair its original configuration with 5 min when it is cut. Moreover, the activated carbon-based supercapacitor with B-PVA/KCl/GO hydrogel electrolyte delivers high specific capacitance of 156 F g −1 at 0.3 A g −1 and can also restore its capacitive performances via 7 times healing cycles without external stimulus. The presented work provides a new strategy to construct a flexible and self-healing hydrogel to apply for wearable electronics , smart apparels or flexible robots.
研究领域:
材料科学
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能源存储
·
智能设备
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Chang Li,Xi Chen,Liming Shen,Ningzhong Bao
To fully understand the chemical structure of graphene oxide and the oxidation chemistry of sp2 carbon sites, we conducted a practical experiment and density functional theory combined study on the oxidation process of graphite. The nuclear magnetic resonance, thermogravimetric analysis, and X-ray photoelectron spectroscopy results of unhydrolyzed oxidized graphite indicate that the oxidation process involves the intercalating oxidation, where electrically neutral species is the oxidizing agent, and the diffusive-oxidation, where MnO3+ is the oxidizing agent. An intrinsic formation and conversion path of oxygen-containing functional groups is proposed based on the experimental results and further interpreted with the aid of frontier molecular orbital theory and density functional theory. Meanwhile, the two unique features of the oxidation process of graphite, the chemistry stability of oxygen-containing functional groups in the strong oxidizing medium, and the self-regulation of the oxidation process are theoretically reasoned.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Xuejiao Sun,Daofei Lv,Yongwei Chen,Ying Wu,Qihui Wu,Qibin Xia,Zhong Li
Chromium-based MIL-101 and graphite oxide (GO) composite (MIL-101@GO) was synthesized and applied for adsorption performances toward a series of aromatics (benzene, toluene, and ethylbenzene). Desorption activation energies of aromatics on this composite were evaluated based on temperature-programmed desorption (TPD) experiments. The results indicated that the aromatic uptakes on the composite increase with the carbon number at low pressure. In contrast, at high pressure, their adsorption capacities exhibit an opposite trend. The composite possesses high uptakes of the aromatics, which are approximately 1.8–6.0 times higher compared with conventional adsorbents. The desorption activation energies of the aromatics increase with the carbon number of aromatics. Additionally, the adsorption of ethylbenzene on the composite is highly reversible. More importantly, the MIL-101@GO composite exhibits enhanced thermal conductivity up to 0.369 W/mK at 303 K. The MIL-101@GO composite with high adsorption capacity, enhanced thermal conductivity, and efficient recyclability provided a promising candidate for practical applications in field of volatile organic compounds adsorption.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2015
·
IF 1.295
Meiling Wang,Mengzhi Yang,Qian Sun,Yunqiao Gao,Jianwei Zhao
A facile method was developed for the detection of Brilliant Blue FCF (BB FCF) (E133), a synthetic soluble colorant in common beverages. The method is based on a new composite of multi-walled carbon nanotube (MWCNT)-graphite oxide (GO)-room temperature ionic liquids (MWCNT/GO-RTIL) of 1-butyl-3-methylimidazolium hexafluorophosphate with high dispersibility and strong conductivity. Differential pulse stripping voltammetry (DPSV) and the MWCNT/GO-RTIL composite-modified glassy carbon electrode (GCE) were used to determine the BB FCF in this work. Under the optimum experimental conditions, the oxidation current of BB FCF was proportional to its concentration in two linear ranges, from 6.34 μg kg−1 to 7.93 × 102 μg kg−1 and 7.93 × 102 μg kg−1 to 7.93 × 103 μg kg−1.The detection limit was down to 3.01 μg kg−1 at signal-to-noise ratio of 3. Also, this method has been successfully applied in the determination of BB FCF in common beverage samples, including RIO cocktail, Bacardi Breezer and Reinnbow rum dinks. The assay results of BB FCF in drink samples obtained by the proposed method were in a good agreement with the reference values detected by high performance liquid chromatography (HPLC). The proposed method provided a useful tool for the assay of BB FCF in drink samples.
研究领域:
分析化学
·
食品科学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2023
·
IF 5.3
Yue Hua,Jingsen Zhang,Tengda Zhang,Aimin Zhu,Guangqing Xia,Xiuling Zhang,Lanbo Di
Catalytic removal of 4-nitrophenol (4-NP) in wastewater remains a significant challenge due to the poor activity and stability of the catalysts. Herein, low-cost graphite oxide (GO) supported Pd and Ni NPs (PdNi/GO) with enhanced catalytic activity and stability for 4-NP reduction were synthesized by a plasma method in the aqueous solution of Pd(NO 3 ) 2 , Ni(NO 3 ) 2 , and GO. The normalized rate constant k nor over the PdNi/GO with Pd/Ni= 1.8:0.2 for 4-NP reduction was as high as 5480 min −1 ·g −1 ·L, which was comparable with that of Pd/GO, and it was about 50.7 times higher than that of Pd/rGO-H prepared by traditional thermal reduction method. Importantly, after six reaction cycles, it only decreased to 74.8% of the initial value, which was much higher than that of the Pd/GO catalyst (59.8%). The characterization results indicated that plasma synthesized Pd/GO catalyst can keep the oxygen-containing groups (OCGs) on the GO surface , generate abundant defects, and facilitate the adsorption of the 4-NP. Interestingly, the addition of Ni could keep these merits, and the formed PdNi alloyed structure may facilitate the electron transfer between PdNi NPs and GO, contribute to the strong adsorption of 4-NP and the rapid generation of active hydrogen. Consequently, the PdNi/GO catalyst exhibited outstanding catalytic activity and stability for 4-NP reduction. This work provided a fast, facile, environmentally friendly, and easy to scale up plasma method for synthesizing high performance Pd-based catalysts.
研究领域:
环境催化
·
纳米材料
·
物理化学
·
水处理
·
能源与环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）