MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Yuan Wang,Bihong Zhang,Yun Tang,Faqiong Zhao,Baizhao Zeng
A molecularly imprinted polymer/ Au nanoparticles-MoS 2 -graphene/GCE sensor was fabricated and used for the electrochemical detection of rutin. The rose-like Au nanoparticles-MoS 2 -graphene composite (AuNPs-MoS 2 -GN) was fabricated by using a one-pot hydrothermal method. Graphene acted as an efficient matrix for the growth of MoS 2 nanoflower (NF), and the edges of the MoS 2 NF subsequently loaded AuNPs. The AuNPs-MoS 2 -GN composite had large specific surface area, good conductivity and high catalysis, and showed excellent electrochemical response to rutin. To improve the selectivity, rutin imprinted chitosan film was electrodeposited on the AuNPs-MoS 2 -GN/GCE. The obtained molecularly imprinted sensor had strong adsorption capacity for rutin. Under the optimized conditions, the sensor showed a low detection limit (i.e. 4 nmol L −1 ) and a wide detection range (i.e. 0.01–45.0 μmol L −1 ). It also displayed high stability and selectivity. When the sensor was applied to the determination of rutin in real samples satisfactory results were achieved.
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高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Jianfei Xiao,Yuan Wang,Tian C. Zhang,Shaojun Yuan
Nitrogen-sulfur codoped porous carbon (NSPC) is a promising advanced material, showing great application potential in greenhouse gas capture and energy storage. Here, a novel NSPC with controllable porous structure was fabricated via pyrolysis and activation of N, -containing polycondensates, which were synthesized by one-pot polycondensation reaction of triglycidyl isocyanurate, glucose and thiourea. The obtained sample NSPC-1-650 showed cross-linked spherical morphology with uniform pore size (2.61 nm), large specific surface areas (1927.46 m 2 ·g −1 ), and the doping of nitrogen (4 wt%) and sulfur (2 wt%), which leaded to a good CO 2 adsorption capability (5.56 mmol·g −1 at 298.15 K, 5 bar) and excellent stability. Additionally, when used as a supercapacitor, the NSPC-1-650 sample showed an ultrahigh specific capacitance (224.3F·g −1 at 1 A·g −1 in 6 M KOH electrolyte), an excellent rate capability, and good stability (retained > 85% capacity after 5000 cycles). Notably, the all solid-state symmetrical NSPC-1-650-based supercapacitors delivered a high energy density (the maximal value = 7.8 Wh·Kg −1 ) and power density (the maximal value = 4500 W·Kg −1 ). These results suggest that NSPC-1-650 be a competitive candidate as a CO 2 adsorbent and supercapacitor.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Bin Fang,Zipeng Xing,Meijun Guo,Yalu Qiu,Yongqian Cui,Zhenzi Li,Yu Wang,Peng Chen,Wei Zhou
A novel P-doping CdS nanorods@NiFe layered double hydroxide (LDH) Z-scheme photocatalyst (P-CdS@NiFe-LDH) is synthesized through hydrothermal and calcination strategies. Phosphorus doping could form a new Fermi level and reduce the intermediate band gap, thereby prolonging the lifetime of photo-generated electron carriers. The well-designed core–shell nanostructure is conducive to the rapid transfer of carriers. The formation of Z-scheme heterojunction can provide a higher redox potential and reduce the photo-corrosion phenomenon of CdS. The prepared 20% wt P-CdS@NiFe-LDH sample exhibits the highest hydrogen generation rate, which is about 39 times higher than that of the pristine CdS sample. In addition, the degradation rate of P-CdS@NiFe-LDH photocatalyst on bisphenol A is about 98% within 160 min irradiation. With the addition of H 2 O 2 , the photocatalytic degradation performance can be improved significantly due to the photo-Fenton reaction. The excellent catalytic performance can be attributed to the synergistic effect of P-doping and Z-scheme heterojunction extending the photoresponse and promoting spatial charge separation. This research provides a new perspective for the design and synthesis of other Z-scheme heterojunction structure photocatalysts.
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高影响因子
ChemNanoMat
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2021
·Vol. 7
·期 6
·641-650
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IF 3.154
Xu Zhang,Hao Xu,Jisheng Yang,Yuxiao Zhu,Chong Lu,Kemin Zhang,Guoming Weng,Jianxin Zou
Graphical Mg anodes, three-dimensional flower-like cobalt sulfide cathodes, all-phenyl complex (APC) and lithium chloride dissolved in tetrahydrofuran (THF) derived APC-0.8 LiCl/THF electrolyte are used for high-performance magnesium lithium dual ion batteries (MLIBs), demonstrating reversible capacities of 507 mAh g −1 at 0.1 A g −1 and 219 mAh g −1 at 0.5 A g −1 over 500 cycles. Li + /Mg 2+ co-conversion mechanism is studied by ex-situ XRD, SEM and HRTEM. Magnesium lithium dual ion batteries (MLIBs) possess the advantages of Mg anodes with low dendrite formation tendency, high volumetric capacity and abundant resources. The fast reaction kinetics of Li + ions for the whole electrochemical redox processes contribute to provide high reversible capacity and long cycle life. In this study, we propose one type of MLIBs coupled with Mg anodes, flower-like cobalt sulfide (CoS) cathodes, all-phenyl complex (APC) and lithium chloride dissolved in tetrahydrofuran (THF) derived APC- x LiCl/THF ( x =0–0.8 mol L −1 ) electrolytes. By virtue of APC-0.8 LiCl/THF electrolyte, the capacity of MLIB increases gradually to a high capacity of 507 mAh g −1 at 0.1 A g −1 and maintains a reversible capacity of 219 mAh g −1 at 0.5 A g −1 after 500 cycles. More significantly, Mg 2+ and Li + ions co-conversion mechanism on the CoS cathodes is demonstrated for MLIBs. The systems studied here may offer insights in the design of MLIBs.
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高影响因子
Journal of Superconductivity and Novel Magnetism
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2021
·Vol. 34
·期 10
·2565-2572
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IF 1.506
Zhao Caiye,Yi Xiaolei,Hou Qiang,Feng Jiajia,Zhang Yufeng,Xu Mingxiang,Shi Zhixiang
In this work, a series of FeS 1- x Te x (0 ≤ x ≤ 0.15) single crystals were successfully synthesized by a hydrothermal method for the first time. According to the measurement of in-plane resistivity, Hall effect, and magnetoresistance (MR), we find that the superconducting transition temperature T c is rapidly suppressed with the increasing Te substitution, and finally the superconductivity disappears when x > 0.05. With the substitution of Te for S, the residual resistivity ρ 0 increases while the residual resistivity ratio (RRR) decreases monotonously. Meanwhile, the MR of FeS 1- x Te x is also reduced by Te doping. All these results reveal that the Te substitution introduces more impurity scattering. In consequence, the non-linear field-dependent of Hall resistivity ρ xy at low temperature region is suppressed and a linear behavior is restored upon Te doping. The negative Hall coefficients R H for all the FeS 1- x Te x samples suggest that the electron-type carrier dominates the electrical conduction. Moreover, the MR of FeS 1- x Te x obviously follows Kohler’s law, indicating the isotropic scattering rates in the Fermi surface.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Dong Guo,Yongqiang Wang,Chen Chen,Jiaqi He,Meilin Zhu,Jie Chen,Conglu Zhang
The synthesis of Vis-light driven catalysts with high photocatalytic performance and efficient activation of persulfate requires new strategies. Herein, a multistage structural tuning graphitic carbon nitride co-modified by Co, S (pg-C 3 N 4 /Co 3 O 4 /CoS) was synthesized for the first time through in-situ template method and microwave sulfurization treatment. A photocatalysis-PMS oxidation coupling system was also proposed. The results showed that the introduction of cobalt could improve the photocatalysis and PMS activation efficiency of the graphitic carbon nitride. Further sulfurization treatment could generate more active sites for PMS activation and increase the interlayer distance of carbon nitride to broaden the absorption range of Vis-light. Density functional theory (DFT) calculations indicated the migration of electrons from carbon nitride to CoS promoted the recycling of Co 3+ /Co 2+ . In the coupling system, BPF 50 mL (30 mg L -1 ) was degraded by 99% in 10 min with 0.1 g L -1 catalyst and 0.32 mmol L -1 PMS. The degradation rate was 4 times faster than that of pure PMS system under visible light. Notably, BPF was effectively mineralized and TOC removal rate reached 90%. The stability and recycling experiments showed that pg-C 3 N 4 /Co 3 O 4 /CoS maintained high catalytic performance under complex matrix and multiple cycles, and could be quickly separated and recovered due to the magnetic Co 3 O 4 . This work will provide a new strategy for the development of multi performance catalytic materials, and the proposed photocatalysis-PMS coupling system has huge potential for the wastewater treatment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Liyuan Duan,Guoqiang Li,Shuting Zhang,Hongyu Wang,Yongle Zhao,Yongfa Zhang
In this study, graphitized carbon nitride photocatalysts were successfully prepared by using the desulfurized waste liquid extracting salt from coking plants. The NO x removal efficiency of g-C 3 N 4 synthesized using ammonium thiocyanate (NH 4 SCN), ammonium thiosulfate ((NH 4 ) 2 S 2 O 3 ) and ammonium sulfate ((NH 4 ) 2 SO 4 ) with different mass ratios were evaluated. The results showed that due to the addition of (NH 4 ) 2 S 2 O 3 and (NH 4 ) 2 SO 4 a large amount of sulfur-containing gas was released during pyrolysis, which significantly increased the specific surface area and pore volume of the photocatalysts. The release of sulfur-containing gas also resulted in the incorporation of sulfur, and due to this doping process the band gap of the photocatalyst was widened to 2.94 eV, thus enhancing its visible light response. C vacancies were formed in the hepazine ring, which increased the electron density around the N–(C) 3 bridge bond and formed an electron trapping center, thus inhibiting the recombination of charge carriers. The photocatalysts had increased O 2 adsorption capacity and increased number of amino groups on their surface. This facilitated the rapid generation and consumption of reactive oxygen species, inhibited the accumulation of NO 2 on the surface, reduced the production of NO 2 , thus improving the NO x removal efficiency of the photocatalysts. The principle of using “waste for waste control” was achieved, and a new method for nitrogen oxide removal was provided.
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JOURNAL OF POWER SOURCES
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2021
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IF 9.127
Xiangxi Wang,Lei Li,Liangge Xu,Zhao Wang,Zhuoyan Wu,Zhiliang Liu,Piaoping Yangs
The oxygen evolution reaction (OER) is vital for water electrolysis which demands low-cost, durable, and efficient electrocatalysts . Recently, 3d transition metal based OER catalysts become very attractive due to their abundant earth reserve and low price. However, these transition metals still suffer from severe dissolution problem and inappropriate adsorption ability to the intermediate species during OER catalysis. Herein, we prepared Mn and Co co-decorated Ni composites nanosheets (MnCo@NiS) via a facile step-by-step electrodeposition way, which showed near-optimal adsorption energy to oxygenated intermediates and much better electrocatalytic OER performance than single metal decorated NiS or non-decorated one, especially requiring a low OER overpotential of only 286 mV at 10 mA cm −2 in an alkaline electrolyte and Tafel slope of 31.5 mV dec −1 . The results indicated Mn and Co co-decoration is very efficient way to change the electron distribution and optimize the adsorption energy of NiS, leading to the high OER performance. In particular, the MnCo@NiS electrode demonstrates a highly impressive stability with not only much less cation dissolution but negligible degradation after 20 h durability test at 50 mA cm −2 .
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 6
·1580-1592
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IF 3.174
Yicheng Dou,Xingyu Shen,Jinte Zou,Runzhe Shi,Tingting Yan,Qiya Sun,Lin Wang
BACKGROUND In this study, sulfur-doped g-C 3 N 4 (SCN) nanosheets were synthesized using thiourea as a precursor, and then used to catalyze the degradation of oxytetracycline (OTC) under visible-light irradiation. OTC was chosen as target contaminant because of it being an important precursor of N -nitrosodimethylamine (NDMA). RESULTS The removal of OTC was influenced by its initial concentration, initial pH, SCN dosage and water matrices. OTC (≤10 mg L −1 ) was almost completely removed in 40 min under the conditions of an initial pH of 7.0 and a SCN dose of 1.0 g L −1 , and its degradation was well described by the pseudo-first-order kinetics model. Water matrices would also influence the degradation of OTC in the system. Electron paramagnetic resonance analysis and trapping experiments confirmed that the function of the radicals for OTC removal followed the order of • O 2 − > • OH > h + . Eight transformation products were determined during the degradation of OTC, it being removed through four pathways: methyl oxidization, demethylation, decarbonylation and secondary alcohol oxidation. SCN was stable in the system, as the removal efficiency of OTC was not significantly reduced even after three recycles. In addition, 55.5% of NDMA formation potential of OTC was reduced after SCN catalytic oxidation. CONCLUSIONS The results imply that the visible-light-driven SCN catalytic oxidation is an effective technology not only for the removal of OTC but also for the reduction of NDMA formation potential. © 2021 Society of Chemical Industry
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 45
·期 4
·6227-6238
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IF 3.741
Xiangxiang Du,Xuejun Shi,Yanling Li,Kesheng Cao
Summary Herein, N, S-co-doped graphene hydrogel (N/SGH) was first prepared by one-pot feasible hydrothermal approach using thiourea as a dopant for both N and S sources. And then, polyaniline (PANI) was grown on the surface of N, S-co-doped graphene hydrogel via simple adsorption of aniline monomer and in situ polymerization process. The N, S-co-doped graphene/polyaniline (N/SGH/PANI) composite hydrogel was fabricated as a free-standing and binder-free electrode material. Due to the co-doped synergistic effect, the N/SGH electrode exhibited enhanced electrochemical performances. The N/SGH electrode displays a specific capacitance of 130.4 F/g at 0.5 A/g. Compared with pure graphene hydrogel (GH), the specific capacitance of N/SGH and N-doped graphene (NGH) electrodes at 0.5 A/g increased by 53% and 20%, respectively. PANI pseudocapacitor material was introduced to further improve its capacitive performance. The resultant N/SGH/PANI composite electrode could achieve a max specific capacitance of 236.5 F/g at 0.5 A/g. In addition, N/SGH/PANI composite electrode showed stable cycle performance with the capacity retention of 95.1% after 1000 cycles performed at 10 A/g. Those provide a fabrication strategy for the design of high-performance supercapacitors electrode materials.
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CHEMOSPHERE
·
2020
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IF 5.778
Chao Chen,Jing Kang,Jimin Shen,Shengxin Zhao,Binyuan Wang,Zhonglin Chen,Qian Chen
Polyacrylonitrile fiber was successfully modified with triazine-based dendrimer via grafting method as a promising adsorbent for removal of mercury species from aqueous media. The prepared adsorbent was characterized by elemental analysis, scanning electron microscope , Fourier transform infrared spectroscopy , porous structure analysis and X-ray photoelectron spectroscopy, providing the evidence of successful fabrication. The adsorption conditions were found via varying pH, dosage, coexisting substances, contact time, temperature and concentration. Adsorption performance, described better by the pseudo-second-order kinetics with intraparticle diffusion as rate controlling step and Langmuir isotherm model, indicated a chemisorption process with the maximum Langmuir adsorption amount of 227.64 mg g −1 for mercury ions. Thermodynamically, adsorption of mercury ions was spontaneous and endothermic. Desorption and regeneration experiments demonstrated that it could be reused in five successive adsorption cycles without significant loss of its original performance. Experimental data and density functional theory calculation disclosed the coordination geometries and chelating mechanism between the adsorbent and mercury ions. The proposed study would provide a new prospect for the purification of mercury in aqueous system by functionalizing commercial polyacrylonitrile fiber with dendrimers.
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PubMed
高影响因子
Energy Technology
·
2020
·Vol. 8
·期 10
·2000544
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IF 3.404
Xuexia Liu,Limin Liu,Weiwei Yan,Yinfeng Wang,Chunfang Huang,Zhijun Wang
Iron-based materials are ideal faradaic electrodes for supercapacitors. However, boosting the specific capacitance and preparation with the simple method of iron-based materials remains a great challenge. Herein, hierarchical Fe 3 O 4 @FeS 2 nanocomposites are constructed through an annealing strategy with monohydrate ferrous sulfate as the precursor. X-ray diffractometry, high-resolution transition electron, and X-ray photoelectron spectroscopy results reveal that the hierarchical Fe 3 O 4 @FeS 2 nanocomposite is successively fabricated. The as-prepared materials exhibit a remarkable specific capacitance of 597.1 F g −1 at a current density of 3 A g −1 as electrode materials of supercapacitors. Inspiringly, specific capacitance is superior to most iron-based electrodes in previous reports. This may be ascribed to the junction at the interface of the different components and the efficient electron transfer of FeS 2 . This work is meaningful for the design and preparation of electrode materials with specific capacitance.
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