JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Yang Zhao,Di Wu,Ying Chen,Yang Li,Xiaobin Fan,Fengbao Zhang,Guoliang Zhang,Wenchao Peng
Carbon materials are effective catalysts to activate peroxymonosulfate (PMS) for organic pollutant degradation. Both nitrogen doping and structural defects could enhance their catalytic performance for PMS activation. In this study, nitrogen-doped graphene (NG) is first synthesized by the calcination of graphene oxide (GO) with ammonium nitrate (NH 4 NO 3 ). The obtained NG is then annealed further at a higher temperature under a N 2 atmosphere to remove partially doped N atoms and create new structural defects. The obtained defective nitrogen-doped graphene (D-NG) can activate PMS for bisphenol A (BPA) degradation more effectively. Different annealing temperatures from 850 to 1150 °C are investigated, and D-NG synthesized at 1050 °C exhibits the highest activity. The enhanced catalytic performance is proposed to originate from the synergistic effect between doped N atoms and created structural defects. According to radical quenching, electron paramagnetic resonance (EPR), and electrochemical results, both radical and nonradical pathways are present during PMS activation, and the nonradical pathway plays the dominant role. This study provides a facile method for metal-free catalyst synthesis, which also enriches the synergistic mechanism between doped N and structural defects and thus should have great potential in wastewater remediation.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Jian Zhang,Minxia Kang,Yihong Zhou,Changpo Ma,Feng Ning,Zumin Qiu
In this study, a simple method was introduced to synthesize polyethyleneimine modified magnetic graphite (Fe 3 O 4 @GR-PEI( 50 )), which was used to adsorb humic acid (HA) from aqueous solution. The obtained materials were characterized by field emission scanning electron microscope , X-Ray diffraction, Fourier transform-infrared, and thermogravimetric analysis . The results showed that Fe 3 O 4 @GR-PEI( 50 ) was synthesized successfully and PEI uniformly covered on Fe 3 O 4 @GR-PEI( 50 ) surface. The adsorption performance was evaluated at different concentration, temperature, pH, and cationic concentration. The maximum adsorption capacity of Fe 3 O 4 @GR-PEI( 50 ) was 49.87 mg/g at 293 ± 1 K and it was greatly affected by the solution pH and the additional cations. This is mainly due to the strong electrostatic interactions between the negatively charged HA molecules and the positively charged adsorbents. The adsorption kinetics were examined using pseudo-first-order, pseudo-second-order and intra-particle diffusion model. The equilibrium adsorption data were analyzed by Langmuir and Freundlich models. The results revealed that the pseudo-second-order model and Freundlich isotherm fit the kinetics and equilibrium data, respectively. Furthermore, Fe 3 O 4 @GR-PEI( 50 ) exhibited a good performance of regeneration and reuse, which maintained a high adsorption capacity after six consecutive times of regeneration.
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ENERGY CONVERSION AND MANAGEMENT
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2020
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IF 8.208
Xiaoxiang Li,Jingyi Zhang,Benwei Fu,Chengyi Song,Wen Shang,Peng Tao,Tao Deng
Erythritol (ET) has received increasing research attention for medium-temperature phase change solar-thermal energy storage. However, ET suffers from serious supercooling, low thermal conductivity, poor solar absorption and leakage after melting, which lead to low solar-thermal energy harvesting and releasing efficiency. Herein, we simultaneously overcome these inherent shortcomings by impregnating ET within surface-roughened hydrophilic copper foam, which is prepared by subsequent oxidization of commercial copper foam and thermal reduction under hydrogen, and using stably dispersed crumpled graphene particles as the solar-thermal converter. Such oxidization-reduction-treated copper foam not only provides numerous heterogeneous nucleation sites and lowers the nucleation energy barrier for forming ET crystals during the solidification process, but also facilitates rapid charging and discharging along three-dimensional heat conductive networks, and confines the melted ET. Compared with neat ET, the copper foam-templated composites have reduced the supercooling degree by ~60 °C and improved thermal conductivity by more than 5 times, which in turn lead to a large latent-heat releasing percentage of 85.8% and a high heat-extraction efficiency of 94.2%. We demonstrate that such composites can be used for high-efficiency, medium-temperature, form-stable, direct solar-thermal energy harvesting, and the harvested heat can be readily converted into electricity to power small devices.
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JOURNAL OF SEPARATION SCIENCE
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2020
·Vol. 44
·期 6
·1140-1147
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IF 2.878
Xiangqiong Jiang,Guihua Ruan,Wenjuan Zhang,Yan Zhang,Fuyou Du,Zhengyi Chen
In this work, graphene oxide-hybridized high internal emulsion polymers with crosslinking and open-cell structure was prepared and applied for separation and enrichment of estrogens. The prepared graphene oxide-hybridized high internal emulsion polymer monoliths had hydrophobicity, porosity and stability, which were just obtained by one step in-situ emulsion polymerization of 2-ethylhexyl acrylate, glycidyl methacrylate, and divinylbenzene after doping with graphene oxide. Benefit from the advantages of its unique character, the graphene oxide-hybridized high internal emulsion polymers monolith with low background pressure (85 kPa) and high mechanical strength could be applied for efficient separation for trace estrogens in urine. Under the optimized condition, trace estrogens, including estrone, estradiol, and diethylstilbestrol in urine, were detected by high-performance liquid chromatography, all the sample preparation process were carried out in 15 min, the recovery rate was ranged from 85.0 to 106.0% and the relative standard deviation was less than 4.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Jing Ren,Jianfeng Li,Zhaozan Xu,Yu Liu,Fangqin Cheng
To overcome the limitations of existing hydrophobic membranes for membrane distillation (MD) to treat industrial wastewater with complex contaminants, a composite membrane was developed in this study via incorporating graphene oxide (GO) on commercial polytetrafluoroethylene (PTFE) membrane. The dual-layer GO/PTFE membrane demonstrated asymmetric wettability, which transformed the membrane from in-air hydrophobic and underwater superoleophilic pristine surface to in-air hydrophilic and underwater oleophobic surface. The composite membrane displayed excellent salt rejection (>99.9%) and organic rejection (99.4%) during MD of bio-treated coking wastewater, outperforming the pristine PTFE membrane with apparent fouling and wetting phenomenon. The flux of GO/PTFE membrane reached 20.1 kg/m 2 ·h, which is 44% higher than that of the pristine membrane. These improvements were attributed to the specific morphological and physicochemical characteristics of the composite membrane, such as high water affinity, strongly negative charges on membrane surface, reduced temperature polarization and screening effect to large molecules by the GO layer. This study suggests that GO/PTFE composite membrane has great potential in enhancing the permeate flux and fouling resistance simultaneously, which could be a competitive option for MD to treat challenging wastewaters enriched with salts and hydrophobic organics.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Usman Farooq,Jingguo Zhuang,Xinhai Wang,Shuguang Lyu
The removal of chlorinated hydrocarbons through heterogeneous catalysts from groundwater has become a valuable approach. However, the synthesis of a highly efficient and persistent material especially for trichloroethane (TCA) removal is still immature . In this study, we prepared polydopamine (PDA) embedded Fe/rGO nanocomposite via pH-induced polymerization of dopamine for the degradation of TCA in sodium percarbonate (SPC) system. The experimental outcomes revealed that PDA decorated Fe/rGO not only enhanced the TCA degradation (98%) more economically but also strengthened the stability and recyclability of catalyst compared to bare Fe/rGO. The TEM, XRD, FTIR, XPS and VSM analyses declared the successful preparation of magnetically separable PDA@Fe/rGO nanocomposite. Furthermore, a higher degradation rate of probe compounds in PDA@Fe/rGO/SPC system indicated that PDA decoration improved the formation of active species due to autoxidation of dopamine and reducing capability of PDA. The impact of solution matrix on PDA@Fe/rGO performance elucidated the effect of various species on degradation. The GCMS, TOC analysis and dechlorination experiments validated the formation of non-toxic products and reasonable TOC and chloride ions removal. The PDA@Fe/rGO catalyst can be recycled for six consecutive cycles retaining a 76% along with abundant availability of Fe 2+ and Fe 3+ species validated using XRD and XPS analysis. The enhanced remediation capacity and improved recyclability of PDA@Fe/rGO nanocomposite can serve as a shining star for the practical application of TCA removal in groundwater.
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OPTICAL MATERIALS
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2020
·
IF 2.779
Ya Nan Wang,Jin Li
ZnO-based semiconductor photocatalysts have emerged from many catalysts and become research hotspots as non-toxic, odorless, and readily available raw materials. Ce-doped ZnO and graphene composites with different concentrations (0 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%) were only synthesized by hydrothermal method . The results show that Ce was successfully doped in ZnO by substituting zinc vacancy and compounded with graphene, and distributed uniformly in ZnO lattice. In terms of optical properties , compared with pure ZnO, the absorption of visible light is enhanced, the light response range is widened, the number of electrons that transition back to the ground state is reduced, which indicates that the photocarriers are effectively separated. Compared with the degradation efficiency of pure ZnO (20.28%), ZGCeO series samples showed superior photocatalytic performance, among which ZGCeO2 (2 wt%) samples had the highest photocatalytic activity and catalytic efficiency, and the degradation rate reached 99.12% within 80 min. In this experiment, 2 wt% is the best doping ratio.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Xianrong Deng,Zhuo Zou,Yuhuan Zhang,Jiechang Gao,Taotao Liang,Zhisong Lu,Chang Ming Li
Nitric oxide (NO) is an important bio-regulatory and signaling molecule associated with various physiological and pathophysiological pathways, but its sensitive real-time detection is still very challenging due to the low concentration, large diffusivity and fast decay in biological samples. Here an antimony tetroxide (Sb 2 O 4 ) nanoflowers/reduced graphene oxide (rGO) nanocomposite is synthesized via a facile and eco-friendly solvothermal method to merit-combine highly electroactive Sb 2 O 4 nanoflowers with large surficial rGO component for a strong synergistic effect on oxidation of NO. Results demonstrate that the Sb 2 O 4 /rGO-based sensor has a low detection limit, high sensitivity, excellent selectivity and fast response for NO detection. The real-time detected NO released from living cells showed significant difference between normal and tumor cells. The Sb 2 O 4 nanoflowers/rGO nanocomposite sensor holds a great promise for important applications in biomedical research fields and clinical diagnosis.
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高影响因子
SENSORS
·
2020
·Vol. 20
·期 15
·4146
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IF 3.275
Chuxuan Zhang,Xinqiang Liang,Yuanyuan Lu,Hua Li,Xiangyang Xu
Glyphosate, which has been widely reported to be a toxic pollutant, is often present at trace amounts in the environment. In this study, a novel copper-aluminum metal hydroxide doped graphene nanoprobe (labeled as CuAl–LDH/Gr NC) was first developed to construct a non-enzymatic electrochemical sensor for detection trace glyphosate. The characterization results showed that the synthesized CuAl–LDH had a high-crystallinity flowered structure, abundant metallic bands and an intercalated functional group. After mixed with Gr, the nanocomposites provided a larger surface area and better conductivity. The as-prepared CuAl–LDH/Gr NC dramatically improved the enrichment capability for glyphosate to realize the stripping voltammetry detection. The logarithmic linear detection range of the sensor was found to be 2.96 × 10−9–1.18 × 10−6mol L−1with the detection limit of 1 × 10−9mol L−1with excellent repeatability, good stability and anti-interference ability. Further, the sensor achieved satisfactory recovery rates in spiked surface water, ranging from 97.64% to 108.08%, demonstrating great accuracy and practicality.Keywords:electrochemical detection;glyphosate;layer double hydroxides;sensor
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Longjie Liu,Qianyu Xu,Gary Owens,Zuliang Chen
Antibiotics are an emerging class of persistent contaminants that are now of major environmental concern because they pose potential risks to both environmental and human health. Here reduced graphene oxide composited with bimetallic iron/palladium nanoparticles (rGO@ n Fe/Pd) was synthesized via a green tea extract and used to remove a common antibiotic, rifampicin from aqueous solution. The innate physical rifampicin removal efficiency of the composite (79.9 %) was increased to 85.7 % when combined with Fenton-oxidation. The mechanism and the main factors controlling Fenton-oxidation of rifampicin by rGO@ n Fe/Pd were investigated. Oxidation followed a pseudo-second-order degradation kinetic model with an activation energy of 47.3 kJ mol −1 . rGO@ n Fe/Pd were characterized by Brunauer-Emmett-Teller (BET), fourier transform infrared (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray energy spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-Ray powder diffraction (XRD), and zeta potential. Rifampicin degradation products observed by LC-UV, where subsequently confirmed to be mainly 5,6,9-trihydroxynaphtho [2,1-b] furan-1(2 H)-one, 5,6-dihydroxy-1-oxo-1,2-dihydronaphtho [2,1-b] furan-2-yl formate and ( S )-5,6,9-trihydroxy-2-(3-methoxypropoxy)-2-methylnaphtho [2,1-b] furan-1(2 H)-one by LC–MS. Finally, the practical effectiveness of the composite material for antibiotic removal was demonstrated by the treatment of representative wastewaters, where rifampicin removal efficiencies of 80.4, 77.9 and 70.2 % were observed for river, aquaculture wastewater and domestic wastewater, respectively.
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Energy Storage Materials
·
2020
·
IF 16.28
Chao Li,Banggui Lao,Zhike Li,Huibin Yin,Zhenyu Yang,Hongyu Wang,Deliang Chen,Xiaoli Zhang,Yongjun Xu,Chenghua Sun
Dual-ion batteries (DIBs) offer unique merits for energy storage, such as high energy density and excellent safety, but are usually limited by sluggish kinetics for anions intercalation into graphite cathodes under high voltage range (≥5.4 V). Here, we reported MoS 2 as a novel cathode to store anion owing to larger layered spacing (~ 6.15 Å) than graphite (~ 3.35 Å). Such structure can effectively improve anion intercalation kinetics and achieve excellent stability in a wide voltage window (below 5 V). Complete batteries have been further fabricated, achieving stable cycling performance with promising working voltage and energy density, which exceeds most reported DIBs.
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Materials Express
·
2020
·Vol. 10
·期 10
·1725-1731
·
IF 1.65
Duan Xiaobo,Ding Yanhong,Yu Meng
Multilayer graphene was prepared in this study by microwave burst method. Cu9S5/CoS/graphene and CuS/CoS2/graphene composites were obtained by hydrothermal method to regulate the molecular structure and combination of Cu and Co metal sulfides on graphene
substrate. Graphite oxide was doped by hydrothermal method, and then Cu9S5/CoS/graphene composite was prepared by microwave explosion method. Raman, SEM and TEM were used to characterize the self-made graphene. Results showed that the multilayer graphene had a bag-like
structure which was beneficial to anchor sulfide. Three graphene-based composites were characterized by scanning electron microscopy, X-ray diffraction, energy spectrum analysis and electrochemical properties. Moreover, results showed that CuS/CoS2/graphene had the best electrochemical
performance, and its specific capacity reached 324 F/g when the current density was 1 A · g–1, which was much higher than that of the other two samples. Capacity retention rate, interfacial charge transfer resistance and electrolyte diffusion resistance also have advantages.
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