JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Shaoxiong Feng,Weigang Ding,Yan Zhang,Jingwei Wu,Zhiming Zou,Tongfa Wu,Qun Tang
A novel neodymium-based metal-organic framework (Nd-MOF) {[Nd 2 (Hpdc) 3 (H 2 O) 6 ]·3H 2 O} n (H 3 pdc = 1H-pyrazole-3,5-dicarboxylic acid) was synthesized by a simple hydrothermal method and structurally characterized. By dropped onto glassy carbon electrodes (GCE), the prepared Nd-MOF was applied to construct an efficient electrochemical sensor for the rapid and reliable electrochemical detection of Rhodamine B (RhB). This proposed Nd-MOF/GCE sensor exhibited strong accumulation ability and high electrocatalytic activity for RhB. Electrochemical oxidation signal of RhB at the Nd-MOF/GCE was greatly enhanced as compared to that at the bare GCE. The effective factors such as pH of buffer solution , amount of Nd-MOF suspension and accumulation time were optimized for the quantitative detection of RhB. Under optimum conditions, the fabricated sensor showed two wide linear ranges of 0.08–2.0 and 2.0–40 μM with a low detection limit of 3.6 nM, which was ascribed to the advantages of Nd-MOF such as large specific surface area, multiple active sites, strong accumulation ability. Moreover, the developed Nd-MOF/GCE sensor displayed good selectivity and accuracy towards RhB detection in the actual samples. Thus, this simple and efficient approach for RhB detection has good prospective for application in environmental monitoring.
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INORGANIC CHEMISTRY
·
2021
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IF 5.165
Zhenyu Zhao,Zuoyi Xiao,Yaru Xi,Guoxiang Wang,Youchen Zhang,Jiajun Li,Li Wei
Manufacturing heteroatom-doped porous C with controllable N species is an important issue for supercapacitors. Herein, we report a low-cost and simplified strategy for synthesizing B,N-codoped porous C (BNPC) by a freeze-drying chitosan–boric acid aerogel beads and subsequent carbonization treatment. The BNPC samples were studied using various characterization technologies. The introduction of boric acid to chitosan successfully induced the formation of B,N-codoped C with a well-developed 3D interconnected porous structure. The B doping had a significant impact on the distribution of N species in the samples. Moreover, the good wettability of the sample resulting from B doping is favorable for electrolyte diffusion and ion transport. As a consequence, the optimal BNPC sample showed an excellent specific capacitance of 240 F g–1 at 0.5 A g–1 and an outstanding capacitance retention of 95.1% after 10000 cycles at 5 A g–1. An assembled symmetrical supercapacitor displayed an energy density of 11.4 Wh kg–1 at a power density of 250 W kg–1. The proposed work provides a simple and effective method to obtain B,N-codoped C-based materials with high electrochemical performance.
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ANALYTICA CHIMICA ACTA
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2021
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IF 6.558
Qian He,Shengyi Zhuang,Yuxiu Yu,Haojie Li,Yaodong Liu
Quick and visual detection of component contents, such as water, in a mixed solvent is important for many practical applications, and a full range detection is especially preferred. In this work, a carbon dots based ratiometric fluorescent sensor was synthesized by grafting fluorescent group (Rhodamine B, RhB) on carbon dots, and the dual emission peaks exhibited a linear ratiometric response with the change of polarity and hydrogen bond of Solvent Hansen solubility parameters. This responsive behavior is attributed to surface state photoluminescence mechanisms, and has been used for the quantitative detection of water content in ethanol with an excellent linear relationship (R 2 = 0.996), a low detection limit (0.2%), and a full detection range (0–100%). Furthermore, a paper-based ratiometric fluorescence sensing strip is also demonstrated, which exhibits good storage stability and sensitivity. This study suggests that RhB grafted carbon dots could be feasibly and effectively used as ratiometric fluorescent sensors for solvent content detection.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2021
·Vol. 25
·期 5
·1541-1553
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IF 2.647
Zeng Laiyuan,Wei Xuefeng,Miao Juan,Zhang Ruichang,Zhang Jun,Zhou Ming,Lu Weiwei
A Sb-doped SnO 2 anode modified with Ni and B was fabricated by the sol–gel method. The effect of major operation parameters of electrode preparation, such as Ni content, B content, and calcination temperature, on the mineralization degree of phenol was investigated. Response surface methodology was used to optimize the experimental conditions and evaluate the association between various operation parameters. The morphology, crystal structure, and electrocatalytic performance of the prepared SnO 2 –Sb–Ni–B anodes were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), linear sweep voltammetry (LSV), and cyclic voltammetry (CV). The optimized sol–gel preparation ratio of citric acid, ethylene glycol, tin tetrachloride, antimony trichloride, nickel chloride, and boric acid was 650:200:100:6.5:0.5:2, and the calcination temperature of the electrode was 550 °C. The SnO 2 –Sb–Ni–B anode has the highest oxygen evolution potential of 1.63 V (vs. Hg 2 /Hg 2 SO 4 ). The removal degree of phenol reached 58% within 2 h on the SnO 2 –Sb–Ni–B anode. The accelerated lifetime of the selected SnO 2 –Ni–B anode was 720 min, which was carried out in a 3-mol/L sulfuric acid solution with a current density of 500 mA/cm 2 .
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Yuting Zeng,Yan Li,Xiaofeng Tan,Jindi Gong,Ziyu Wang,Yuhao An,Zhenqiang Wang,He Li
Among plentiful porous nanomaterials, noble metal aerogels taken as nanozymes attract broad attention in sensing applications with their distinct enzyme mimic functions. In the catalytic field, the heteroatom doping strategy is a kind of way with great promise in improving the enzyme mimic activity of noble metal aerogels. In this experiment, we find a type of creative materials that were prepared by the fast and simple method. Due to the unique porous structure and synergetic effect from doped atoms, PdRu aerogels co-doped with boron and nitrogen (B, N-PdRu aerogels) were prepared using NH3BH3 as a reductant, which present improved peroxidase mimicking activity. With the existence of H2O2, the oxidation of 3,3′,5,5′-tetramethylbenzidine was catalyzed by B, N-PdRu aerogels fairly efficiently, whose solution would be a blue appearance at optimum absorption wavelength 652 nm. Thus, by the tandem reaction bound to the enzyme glucose oxidase, the B, N-PdRu aerogels can be used for the sensitive determination of glucose. The new method has a good linear detection effect for glucose in the range of 10 μM to 2 mM. The minimum limit of detection can reach as low as 6 μM. This work will contribute to research on the rational design of metal aerogels based on the heteroatomic doping strategy and enhance the corresponding performance for a variety of applications.
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Green Energy & Environment
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2021
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IF 8.207
Dashui Yuan,Zongyuan Li,Xueru Chen,Jing Ding,Hui Wan,Guofeng Guan
Proper interface and band alignment always play essential roles in the separation of photoexcited charge of photocatalysts. In this work, we prepared a homodispersed S-scheme carbon nitride homojunction with local electron structure difference by a facile pre-doping and two-step calcination approach. Boron doping into heptazine created extra acceptor impurity, and phosphorus doping into heptazine created extra donor impurity, which eventually modulated the electronic structure of carbon nitride. As heptazines with different element doping were integrated into carbon nitride by recalcination, B–CN and P–CN formed a homodispersed homojunction and thus produced a rich interface. Meanwhile, caused by Fermi energy levels equilibrium, the band bending constructed an S-scheme homojunction, which stimulated photogenerated electrons to transfer from CB of B–CN to VB of P–CN. The homodispersed S-scheme homojunction structure led to efficient suppression of recombination of photoinduced charge and retained stronger redox charge. Consequently, the photocatalytic performance was dramatically boosted to 2620 μmol g −1 from 60 μmol g −1 of pure CN in 4-h hydrogen evolution from water. This novel method for electron structure engineering helped to provide a new strategy for designing homojunction photocatalysts with excellent photocatalytic performance.
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Journal of Inorganic and Organometallic Polymers and Materials
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2020
·Vol. 30
·期 12
·4847-4857
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IF 1.941
Wang Hui,Zhang Jia-Rui,Wu Xiang-Feng,Wang Chao,Li Yan,Ci Li-Jie,Jia Yun-Ning,Chang Tian-Long,Liu Xu-Tao,Fu Yun-Xuan
Ag 2 WO 4 is a typically noble metal based photocatalyst with highly efficient photocatalytic activity. However, due to photocorrosion, the pristine Ag 2 WO 4 is prone to inactivation during illumination. Constructing composite photocatalyst may be a useful method to promote the stability of Ag 2 WO 4 . In this work, Ag 2 WO 4 /graphitic carbon nitride nanotubes (g-C 3 N 4 NTs) composite photocatalyst was prepared by adopting an in-situ composite strategy. The photocatalytic performance of the samples was discussed by the degradation of rhodamine B under visible light, and the catalytic mechanism was also analyzed. The characterization results show that the photocatalytic efficiency of the as-prepared Ag 2 WO 4 /g-C 3 N 4 NTs composite increases firstly and then decreases along with the increase of the Ag 2 WO 4 content. When the theoretical molar ratio of Ag 2 WO 4 :g-C 3 N 4 NTs reaches 3:2, the photocatalytic degradation efficiency achieves the optimal value, that is 92.4% within 20 min, which obviously exceeds 2.8% of pure Ag 2 WO 4 and 48.9% of pure g-C 3 N 4 NTs. Moreover, the separation and migration efficiency of photoelectron–hole pairs of the composites can be accelerated in comparison with pure samples. In addition, superoxide radicals and hydroxyl radicals play major roles in the photocatalytic degradation process.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Zhu Mengting,Tonni Agustiono Kurniawan,Ram Avtar,Mohd Hafiz Dzarfan Othman,Tong Ouyang,Huang Yujia,Zhang Xueting,Tjandra Setiadi,Iswanto Iswanto
We test the feasibility of TiO 2 (B)@carbon composites as adsorbents, derived from wheat straws, for tetracycline (TC) adsorption from aqueous solutions. Hydrochar (HC), biochar (BC), and hydrochar-derived pyrolysis char (HDPC) are synthesized hydrothermally from the waste and then functionalized with TiO 2 (B), named as ‘Composite-1′, ‘Composite-2′, and ‘Composite-3′, respectively. A higher loading of TiO 2 (B) into the HC was also synthesized for comparison, named as ‘Composite-4′. To compare their physico-chemical changes before and after surface modification, the composites are characterized using FESEM-EDS, XRD , BET, FRTEM, and FTIR. The effects of H 2 O 2 addition on TC removal are investigated. Adsorption kinetics and isotherms of TC removal are studied, while TC adsorption mechanisms are elaborated. We found that the Composite-4 has the highest TC removal (93%) at pH 7, 1 g/L of dose, and 4 h of reaction time at 50 mg/L of TC after adding H 2 O 2 (10 mM). The TC adsorption capacities of the Composite-1 and Composite-4 are 40.65 and 49.26 mg/g, respectively. The TC removal by the Composite-1 follows the pseudo-second order. Overall, this suggests that converting the wheat straw into HC and then functionalizing its surface with TiO 2 (B) as a composite has added values to the waste as an adsorbent for wastewater treatment .
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Journal of Cleaner Production
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2021
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IF 9.297
Yanping Cui,Zhengwei Zhou,Ya Gao,Lidan Lei,Jungang Cao,Ruojie Wu,Lili Liang,Zhaoqiang Huang
Without external O 2 supply and solution pH adjusting, commercial molybdenum sulfide (MoS 2 ) was firstly applied as co-catalyst in intermittent electro-Fenton process for Rhodamine B (RhB) degradation. In this energy saving system, Fe 2+ /Fe 3+ conversion was facilitated and H 2 O 2 activating was accelerated by MoS 2 . Granular activated carbon wrapped with stainless steel mesh (GACSS) was used as cathode, from which, H 2 O 2 and iron sources were in-situ generated. With 0.1 g/L MoS 2 , and 50 mA applied current with 10 min on-10 min off power frequency, RhB degradation rate constant in the MoS 2 intermittent electro-Fenton was approximately 2.4 times as that without MoS 2 system. Quenching experiments, electron spin resonance (ESR) characterization and free radical fluorescence tests demonstrated hydroxyl radicals (·OH) was the dominant reactive species, and the superiority of intermittent electrolysis mode for RhB degradation. During power on, H 2 O 2 was constantly generated on cathode. In electricity interval, Fe 2+ /Fe 3+ conversion was accelerated on the active sites (Mo 4+ ) to activate residual H 2 O 2 and more ·OH was generated to RhB degradation. Additionally, the characterization analysis (XPS, SEM and FT-IR) demonstrated MoS 2 and GACSS cathode exhibited excellent catalytic and chemical stability in recyclability . Low-cost multifunctional cathode with a high efficiency co-catalyst was combined in this energy saving electro-Fenton operating system for RhB degradation.
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Materials Today Energy
·
2021
·
IF 7.311
Y. Su,C. Li,C. Yao,L. Xu,J. Xue,W. Yuan,J. Liu,M. Cheng,S. Hou
The Palladium (Pd) nanoparticles were immobilized on the boron (B), nitrogen (N) doped porous carbon (BNC-50) through replacing cobalt path at room temperature, which was derived from the high-temperature pyrolysis of the modified Zeolitic Imidazolate Frameworks (ZIF) composes coated with 5-boronoisophthalic acid. The Pd nanoparticles could be uniformly dispersed on the BNC-50 supports by replacement reaction to effectively avoid the Pd nanoparticles agglomeration. Meanwhile, the B, N doping can further grapple the palladium nanoparticles with luxuriant activity sites during the loading process. The highly order carbon frameworks also offer more porous paths and interspace to enhance the mass and charge delivery. Therefore, the synthetic catalysis of palladium nanoparticles immobilized on the porous B, N-doped carbon displays excellent activity (Pd/BNC-50) for ethanol oxidation reaction (EOR). The catalytic activities of the Pd/BNC-50 with peak current density (2638.41 mA mg −1 ) are 3.77 times than that of Pd/C in the basic reaction solution.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2021
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IF 5.279
Chuanyu Han,Zhiyin Yu,Yuting Zhang,Zhiyan Wang,Junwei Zhao,Sheng-Xiong Huang,Zhonghua Ma,Ziyue Wen,Chongxi Liu,Wensheng Xiang
In this study, the supernatant extract from fermentation broth of Streptomyces sp. NEAU-H3 showed strong antifungal activity against Fusarium graminearum strain PH-1 in vitro and in vivo. Three known pyranonaphthoquinones were isolated by means of an activity-guided method, and frenolicin B was characterized as the main active ingredient. Frenolicin B displayed strong antifungal activity against F. graminearum strain PH-1 with an EC50 value of 0.51 mg/L, which is lower than that of carbendazim (0.78 mg/L) but higher than that of phenamacril (0.18 mg/L). Frenolicin B could also strongly inhibit the mycelial growth of Fusarium species, including F. graminearum and F. asiaticum, as well as carbendazim-resistant Fusarium strains isolated from field, with EC50 values of 0.25–0.92 mg/L. Results from field experiments showed that the efficacy of frenolicin B in controlling Fusarium head blight at a treatment concentration of 75 g ai/ha was better than those of phenamacril (375 g ai/ha) and carbendazim (600 g ai/ha) or had no significant difference with that of phenamacril (375 g ai/ha) in 2 years. Scanning electron microscope and transmission electron microscope observations revealed that after treating F. graminearum mycelia with frenolicin B, the mycelia appeared aberrant and had an uneven thickness and swelling, the cytoplasm had disintegrated, and some cell contents were lost. Transcriptome analysis suggests that frenolicin B might inhibit the metabolism of nucleotides and energy by affecting genes involved in phosphorus utilization but did not affect the expression of myosin 5, which is the specific target of phenamacril. These findings indicate that frenolicin B may be a potential agrochemical fungicide for controlling Fusarium head blight.
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Biomolecules
·
2020
·Vol. 10
·期 2
·231
·
IF 4.082
Rabia Durrani,Faez Iqbal Khan,Shahid Ali,Yonghua Wang,Bo Yang
Phospholipase B (EC 3.1.1.5) are a distinctive group of enzymes that catalyzes the hydrolysis of fatty acids esterified at thesn-1andsn-2positions forming free fatty acids and lysophospholipids. The structural information and catalytic mechanism of phospholipase B are still not clear. Herein, we reported a putative phospholipase B (TmPLB1) fromTalaromyces marneffeiGD-0079 synthesized by genome mining library. The gene (TmPlb1) was expressed and the TmPLB1 was purified usingE. colishuffle T7 expression system. The putative TmPLB1 was purified by affinity chromatography with a yield of 13.5%. The TmPLB1 showed optimum activity at 35 °C and pH 7.0. The TmPLB1 showed enzymatic activity using Lecithin (soybean > 98% pure), and the hydrolysis of TmPLB1 by31P NMR showed phosphatidylcholine (PC) as a major phospholipid along with lyso-phospholipids (1-LPC and 2-LPC) and some minor phospholipids. The molecular modeling studies indicate that its active site pocket contains Ser125, Asp183 and His215 as the catalytic triad. The structure dynamics and simulations results explained the conformational changes associated with different environmental conditions. This is the first report on biochemical characterization and structure dynamics of TmPLB1 enzyme. The present study could be helpful to utilize TmPLB1 in food industry for the determination of food components containing phosphorus. Additionally, such enzyme could also be useful in Industry for the modifications of phospholipids.Keywords:free fatty acids (FFAs);NMR (nuclear magnetic resonance);phospholipase B;Talaromyces marneffei;affinity chromatography
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