Journal of Water Process Engineering
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2022
·
IF 7.34
Zhuang He,Yunqiu Zhang,Jiapei Lv,Shuxing Zhou,Jianrui Niu,Zaixing Li,Xinzhong Wang,Thomas Wågberg,Guangzhi Hu
In the present work, a microwave-assisted and secondary roasting preparation process was used to synthesize nanocomposite materials. These materials were modified with amorphous cobalt nanoparticles (Co NPs) on the surface of biochar doped with different nitrogen sources (melamine (Me), 1,10-phenanthroline (Ph), and urea (Ur)). The nanocomposite (Co-N-C(Ur)) with urea as the nitrogen source promoted the generation of mesopores on the surface of carbon materials due to its evaporation during the preparation process thus enhancing the attachment sites of cobalt nanoparticles. The Co-N-C(Ur) had a more significant degradation effect on the primary carcinogen sulfamethazine (SMT) by activating peroxymonosulfate (PMS). The degradation rate of SMT pollutants was 96.6 % within 30 min. The optimal reaction conditions were as follows: catalyst dosage of 0.4 g L −1 , PMS dosage of 0.812 mM, SMT concentration of 10 mg L −1 , and pH of 5.67. Additionally, the Co-N-C(Ur) catalysts possess excellent specific surface area due to the evaporation effect of the calcination process of urea itself compared to other nitrogen source doping. Electrochemical tests revealed that the composites prepared with urea as the nitrogen source had higher PMS-induced current density and lowered material impedance values, which effectively promoted the catalytic performance of SMT degradation. Concurrently, the Co-N-C (Ur) + PMS reaction system exhibited excellent catalytic performance against other antibiotic organic pollutants. Subsequently, through the capture experiments and electron paramagnetic resonance technical analyses, it was determined that the singlet 1 O 2 played a leading role in the reaction system. Finally, a thorough liquid chromatography-mass spectrometry analysis suggested the possible SMT degradation pathways, thereby providing a new strategy for the subsequent heterogeneous catalysts to degrade persistent organic pollutants.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 34
·16341-16351
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IF 3.925
Wanjun Jiang,Shiyu Wu,Guorong Fan,Zongde Wang,Shangxing Chen,Yangping Wen,Peng Wang
The extraordinary properties and unique structure of porous carbon have rapidly turned it into a new favorite in the development and application of high-performance electrocatalytic sensors. Nitrogen, phosphorus co-doped hollow porous carbon microspheres (PRM-HPAs) as an oxidase-like electrocatalytic sensor for baicalin were successfully developed by two-stage activation using both 3-aminophenol and formaldehyde as carbon sources, phosphoric acid as an activator and dopant, and N-dehydroabietoyl-L-alanine as a soft-template. Low-temperature activation in air is the key to obtaining the hollow structure, and increases the content of oxygen-containing groups. High-temperature activation with phosphoric acid in nitrogen significantly increases the micropore content of PRM-HPA, and realizes phosphorus doping. The introduction of a soft-template can effectively prevent the agglomeration of carbon particles, and form uniformly dispersed hollow carbon microspheres. The PRM-HPA with a specific surface area of 1388 m2 g−1, pore volume of 0.69 m3 g−1, and pore size of 17 Å displays excellent electrocatalytic ability, oxidase-like characteristics, and an excellent electrochemical response of about 118-fold enhancement for baicalin in linear ranges of 0.03–7.99 μM with a low limit of detection of 4.3 nM. This work will open a new pathway for the preparation of co-doped hollow porous carbon microspheres and the application of renewable rosin resource.
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Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 17
·2511-2523
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IF 8.683
Yudi Feng,Qiangsheng Sun,Jia Guo,Changchun Wang
High-performance polymers in possession of excellent thermal stabilities and mechanical strength have been explored for many years in high-tech fields. However, a big challenge still remains for balance of the processability and performance. Herein, to address this problem, a new design was attempted to conduct the manufacturing process on amorphous micromolecular precursors, rather than traditional crystals, oligomers or polymers. Firstly, a series of crosslinkable precursors were synthesized from commercial aromatic diamines by simple one-step amidation reaction. These molecular materials showed different glass-forming abilities, which were obviously associated with their molecular structures (size, flexibility and symmetry). Owing to the disordered molecular arrangement, amorphous precursors obtained excellent fluidity when the temperature exceeded the glass transition temperatures (Tg, 52–88 °C), allowing for facile processing at low temperatures. The considerable temperature difference between the Tg and reaction temperature (∼200 °C) led to wide processing windows, at which the viscosities could be adjusted by temperature or shear rate within a wide range from 105 to 100 Pa s (|η*|), showing their broad applicability in diverse traditional processing operations for polymers. All the cured resin films prepared by direct molding and subsequent curing exhibited high thermal decomposition temperatures (Td,5% > 428 °C), high Tg (>234 °C) and robust mechanical strength (storage moduli >1.8 GPa). By taking the advantages of amorphous molecular precursors and BCB crosslinking, the outstanding processability and high performance were well-integrated.
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Journal of Energy Storage
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2022
·
IF 8.907
Hongmei Xie,Juguo Dai,Lili Luo,Long Xia,Xiaohong Wang,Chunying Yang,Yiting Xu,Birong Zeng,Lizong Dai
Energy and environmental issues have been hot topics over the past few decades. As new energy storage conversion equipment, supercapacitor has been hindering due to their low energy density . Constructing asymmetric supercapacitors to boost energy density is considered as an effective approach. In this study, functional modification was combined with in-situ polymerization to prepare the reduced graphene oxide/polyaniline/terpyridine (RGPT) composites to capture metal ions and serve as cathode material of supercapacitor. When Cr 3+ ions are complexed with composite material, the electrochemical property of the resulting material is greatly improved. The RGPT-Cr composites display a high specific capacitance of 1499 F g −1 at 1 A g −1 with outstanding cycling stability in three-electrode systems. Asymmetric supercapacitor (ASC) devices assembled with the RGPT-Cr composites as positive electrodes present a superior energy density up to 117.5 Wh kg −1 at a power density of 915.0 W kg −1 and possess preeminent capacitance retention of 93.2% after 6000 cycles at 20 A g −1 . In addition, the theoretical calculations prove that Cr 3+ helps to enhance the surface-capacitive contribution of whole composites. This strategy has validated the fact that the incorporation of metal coordination bonds boosts the electron transfer efficiency and structural stability of the whole composite.
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JOURNAL OF SEPARATION SCIENCE
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2022
·Vol. 45
·期 14
·2687-2698
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IF 3.614
Hong Pan,Zushan Gan,Haoyun Hu,Cheng Liu,Yipeng Huang,Guihua Ruan
In this study, monodisperse magnetic carbon microspheres were successfully synthesized through the carbonization of phenolic resin encapsulated Fe 3 O 4 core-shell structures. The magnetic carbon microspheres showed high performance in ultrafast extraction and separation of trace triazine herbicides from environmental water samples. Under optimized conditions, both the adsorption and desorption processes could be achieved in 2 min, and the maximum adsorption capacity for simazine and prometryn were 387.6 and 448.5 μg/g. Coupled with high-performance liquid chromatography-ultraviolet detection technology, the detection limit of triazine herbicides was in the range of 0.30–0.41 ng/mL. The mean recoveries ranged from 81.44 to 91.03% with relative standard deviations lower than 7.47%. The excellent magnetic solid-phase extraction performance indicates that magnetic carbon microspheres are promising candidate adsorbents for the fast analysis of environmental contaminants.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Juan Du,Aibing Chen,Senlin Hou,Xueqing Gao
Porous carbon sheets have wide application prospects in many fields, especially in energy storage of supercapacitor due to the features combining both 2D structure and porous architectures. Herein, a self-deposition approach is proposed to obtain N-doped mesoporous carbon nanosheets (N-MCNs), using 3-aminophenol (3-AF) as precursor and Mg(OH) 2 sheet as hard template. This process realizes the direct carbon formation using 3-AF monomer as carbon precursor under the catalysis of hard template avoiding the polymerization and utilization of solvent. The mass ratio of 3-AF to Mg(OH) 2 plays an important role in determining the pore structures and the resulting capacitance behavior. The results show that N-MCNs with a mass ratio of 3-AF and Mg(OH) 2 of 1:1 have good electrochemical behavior for supercapacitors. This N-MCNs based electrode exhibits a high capacitance of 240 F·g −1 at 1 A·g −1 , good rate performance (75.4% retention ratio at 20 A·g −1 ), and high cycling stability with 98.3% initial capacitance retained after 10000 cycles. Symmetric supercapacitors on N-MCNs achieve energy density of 18.2 W·h·kg −1 and power density of 0.4 kW·kg −1 operated within a wide potential range of 0–1.6 V in 1.0 mol·L −1 Na 2 SO 4 solution, exhibiting its potential for electrode materials with high performance.
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MATERIALS & DESIGN
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2022
·
IF 9.417
Wenqi Dong,Xueai Li,Huimin Tang,Kai Shi,Chunsheng Wang,Wanchun Guo,Kesong Tian,Haiyan Wang
The dielectric-magnetic synergistic effect can be achieved by dielectric relaxation and magnetic resonances in composites of carbon materials and magnetic particles. However, there is no direct evidence demonstrating the distribution of electromagnetic energy attenuation in the microstructure of composites. Herein, an amorphous carbon matrix with dispersed Fe/Fe 3 C@graphite-C was fabricated via a facile route. The distribution of the magnetic vector loss and electric vector loss in the hierarchical structures was revealed by numerical simulation. The content and dispersion of magnetic particles as well as the morphology of the amorphous carbon can be tuned. The 3D amorphous carbon matrix with highly dispersed Fe/Fe 3 C@graphite-C nanoparticles provided the strongest absorption of −69.0 dB and an effective response bandwidth (RL ≤ −10 dB) of 7.06 GHz. The numerical simulation revealed that the magnetic vector loss originated only from the core of Fe/Fe 3 C, and the electric vector loss was distributed throughout the structure, especially in the graphite-C shell, the interface between graphite-C and carbon nanoflakes, and the junction of different carbon nanoflakes. This work not only reveals the distribution of electromagnetic loss but also supports the theoretical analysis of the electromagnetic wave attenuation mechanism in composites, which provides direction for the future design of composites.
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FOOD CHEMISTRY
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2023
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IF 8.8
Xiaojuan Niu,Huanhuan He,Hang Ran,Zhen Wu,Yue Tang,Yuangen Wu
Ag 3 PO 4 nanoparticles (NPs) was prepared through a facile coprecipitation method, and was first found to have excellent laccase-mimicking catalytic activity. The study confirms that Fumonisin B1 (FB1) can effectively hinder the production of superoxide anion (O 2 − ) between Ag 3 PO 4 NPs and dissolved oxygen, and further inhibit laccase-mimicking activity of Ag 3 PO 4 NPs. Thus, a novel rapid colorimetric sensor for FB1 analysis in cereal was first established using laccase-mimicking activity as sensing signal. The absorbance variation of sensing solution is directly related to the amount of FB1, and the color change is further combined with smartphone for quantitively analysis of FB1. The limit of detection (LOD) of the sensor is determined as low as 1.73 μg·L −1 , which is far lower than the maximum residue limits (MRLs) of FB1 set by European Commission and US Food and Drug Administration (FDA). The average recovery of 87.8–104.5% for FB1 detection was obtained in cereal.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2023
·
IF 3
Guorong Ma,Pengzheng Luo,Ruiqiang Xu,Rui Ma,Lei Qiu,Chenran Xu,Rang Yang,Yating Li,Zhihao Zhao,Ling Huang,Yanhui Yang,Pei Wang
M. tuberculosis is the most successful intracellular pathogen and remains a major threat to human health. It is crucial to investigate the profile of cytoplasmic proteins from M. tuberculosis for pathogenesis, clinical markers, and protein vaccine development. In this study, six biomimetic affinity chromatography (BiAC) resins with high differences were selected for M. tuberculosis- cytoplasmic protein fractionation. All fractions were identified using liquid chromatography-mass spectrometry (LC-MS/MS) analysis. A total of 1246 M. tuberculosis proteins were detected (p < 0.05), among which 1092 M. tuberculosis proteins were identified in BiAC fractionations and 714 M. tuberculosis proteins in un-fractionations (Table S1.3.1). The majority of 66.8% (831/1246) identifications were distributed in the range of Mw 7.0–70.0 kDa, pI 3.5–8.0, and Gravy values <0.3. Furthermore, 560 M. tuberculosis proteins were detected in both the BiAC fractionations and un-fractionations. Compared with the un-fractionations, the average number of prot_matches, prot_cover, prot_sequence, and emPAI values of these 560 proteins in the BiAC fractionations were increased by 3.791, 1.420, 1.307, and 1.788 times, respectively. Overall, compared with un-fractionations, the confidence and profile of M. tuberculosis cytoplasmic proteins were improved by BiAC fractionations coupled with LC-MS/MS analysis. The strategy of BiAC fractionation can be used as an effective method for pre-separating protein mixtures in proteomic studies.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Zhang-Min Li,Shu-Xian Zhu,Fei-Feng Mao,Yan Zhou,Wenshuai Zhu,Duan-Jian Tao
Currently available aerogels as effective adsorption materials for capture of trace sulfur dioxide (SO 2 ) are unfavorable from the perspective of deep desulfurization technologies. Herein, four phenolic resin-based aerogels with controlled structures varying from spherical (∼1 μm) to nanofiber (∼20 nm) were prepared and characterized using hexadecyl trimethyl ammonium bromide (CATB) as a soft template. It is demonstrated that adjusting the usage amount of CTAB from 0.00 to 0.15 g could effectively regulate SO 2 adsorption capacities of phenolic resin-based aerogels. AG-0.15 nanofiber aerogel exhibited an outstanding SO 2 uptake through a swelling mechanism (10.58 mmol g −1 at 298.2 K, 1.0 bar), and displayed a very high SO 2 /N 2 selectivity (7271 at 298.2 K). Moreover, AG-0.15 nanofiber aerogel also had excellent performance for selective capture of 2000 ppm SO 2 in the mixed SO 2 /N 2 /CO 2 gases through dynamic column breakthrough experiments. Overall, phenolic resin-based nanofiber aerogels are perceived as a promising adsorbent for effective removal of trace SO 2 from flue gas.
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MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-7
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IF 5.833
Xia Chunqiu,Huang Wenying,Kang Xiutang,Chen Pingyun,You Longjie,Guo Liangqia
Mo 5 N 6 nanosheets were synthesized by a nickel-induced growth method and were found to possess peroxidase-like activity in acidic condition and catalase-like activity in weak basic condition. In acidic condition, Mo 5 N 6 nanosheets can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 to form a blue color product (TMB OX ). At the co-existence of 4-aminophenol (4-AP), 4-AP can react with H 2 O 2 and TMB OX , resulting in the decrease of TMB OX and the fading of blue color. Therefore, a facile, sensitive colorimetric method for the quantitative detection of 4-AP was developed. The linear range for 4-AP was 1.0 to 80.0 μmol⋅L ‒1 ( R 2 = 0.999), and the detection limit was 0.56 μmol⋅L ‒1 based on 3 σ / k . Resorcinol, aniline, humic acid, and common ions and anions in surface water did not interfere the determination of 4-AP. This colorimetric method was applied to measure the 4-AP in real water sample from Wulong River in Fujian Province of China. The relative standard deviation for the determination of 4-AP was ranged from 0.03 to 1.88%, and the recoveries from spiked samples were ranged between 99.2 and 107.6%. The determination results were consistent with those obtained by HPLC. Graphical abstract
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NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 10
·4938-4945
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IF 3.159
Wei Shi,Qiang Cheng,Lian Duan,Yang Ding,Zhongduo Xiong,Xiaoxia Li,Aihua Xu
Dioxygen from air is the cleanest and the most abundant oxidative agent; it is of great significance to activate dioxygen to reactive oxygen species for environmental pollutant transformation and degradation. In this work, the simple cobalt(II) ion was found to exhibit high efficiency for p-aminophenol oxidation in bicarbonate aqueous solution with dioxygen as the oxidant at room temperature; simultaneously, the azo dye, Acid Orange 7, can be decolorized by the system. The formed reactive species was carefully studied by electron spin resonance and spin-trapping technologies and radical scavenging measurements. The metal-bound hydroxyl radical, which originated from a Fenton-like reaction between the Co2+–HCO3− complex and the intermediate of H2O2, was suggested as the main reactive species. This study can provide new insight into the mechanism of the molecular oxygen activation by simple metal complexes and their application to the removal or transformation of pollutants under mild reaction conditions.
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