Fermentation-Basel
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2023
·Vol. 9
·期 2
·133
·
IF 3.7
Peng Cheng,Muhammad Usman,Muhammad Arslan,Huanqing Sun,Li Zhou,Mohamed Gamal El-Din
A Gram-positive exoelectrogenRhodococcus pyridinivoranssp. strain HR-1 was cultivated from leachate-fed microbial fuel cell (MFC) to study the biodegradation effect of pyridine. In the comparison with mixed cultured MFC, HR-1 presented a remarkable electrical capacity with a maximum output of 4.33 W/m3under 30 °C in neutral anolyte with 1 g/L acetate as a substrate. Further, HR-1 demonstrated the environmental resistance as a Gram-positive strain. Microbial metabolism was evident at pH between 5–9 and temperature in the range of 20–40 °C, whereas optimal condition for pyridine degradation was observed at 30 °C. This is the first study reporting the degradation of pyridine in the bio-electrochemical system that achieved a 42% ± 5% degradation rate in a full operation cycle at 2 g/L of the concentration. Considering the nonnegligible internal resistance of HR-1-inoculated MFC, trehalose lipid was also introduced as a bio-surfactant to reduce the charge transfer obstacle between the microbes and the electrodes. The surface morphology illustrated that the strain had a plump shape with a high specific area. Accordingly, bio-surfactant addition promoted the anode biomass (1.2 ± 0.1 mg/cm2to 1.7 ± 0.2 mg/cm2) and achieved a higher degradation rate (68% ± 4%). The feasibility of electrochemical disposal on pyridine and eminent adaptability of strain sp. HR-1 as a Gram-positive exoelectrogen makes MFC a practical approach for real application.Keywords:microbial fuel cells;gram-positive exoelectrogen;pyridine;trehalose lipid;Rhodococcus pyridinivorans
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Guofei Zhang,Xin Yu,Zhenlong Wang,Sirong Li,Yunjiong Zhu,Yude Wang,Xuechun Xiao
Organic fuels are the main factors affecting the morphology, pore structure and catalytic active sites of metal oxides in solution combustion synthesis (SCS). However, due to the diversity of organic fuel structures, the specific role of organic fuel types on SCS is questionable. In this work, we compared the effects of five organic fuels on the thermocatalytic active sites of graded porous MgCo 2 O 4 nanomaterials . MgCo 2 O 4 (CA-MCO) prepared with citric acid as fuel has the largest specific surface area and the richest pore structure with the largest number of active sites. And the porous CA-MCO exhibited the best catalytic properties that the T HTD of AP decreased by 206.06 °C, the activation energy ( E a ) decreased by 104.58 kJ·mol −1 , and the reaction rate ( k ) increased by 2.49 s −1 . A possible catalytic mechanism for the thermal decomposition of AP was also proposed based on TG-MS and Hall effect tests. Finally, CA-MCO was applied to AP/HTPB-based composite solid propellants (CSPs), and the results showed that the introduction of CA-MCO significantly shortened the ignition delay time of the CSPs (From 29 ms to 8 ms), indicating its potential application in the CSPs.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Yazhen Wu,Xiaoxiao Li,Zhengyu Jin,Birte Svensson,Yuxiang Bai
How to improve the solubility of linear dextrins (LD) and retain their characteristic helix amphiphilic cavities with flexible embedding capability, is a question worth exploring without adding new chemical groups. The strategy presented in this study is to attach a highly flexible (α-1 → 6) glucochain at the reducing end of LD by preparing a new type of dextrin, referred to as single-arm linear dextrin (SLD). In the actual synthesis, an (α-1 → 6) linked oligosaccharide of DP ¯ 10.7 (PDI = 1.28) was formed by extension of glucose units onto sucrose (2 M) by using L940W mutant of the glucansucrase GTF180-ΔN firstly. Next using γ-CD as glucosylation donor γ-CGTase extended this (α-1 → 6) glucochain with (α-1 → 4) bonds. SLD is a chimeric glucosaccharide comprising an (α-1 → 4) linked part ( DP ¯ 10.5) attached to the nonreducing end of an (α-1 → 6) glucochain as verified by enzyme fingerprinting and 1 H NMR. Furthermore, SLD was validated to show greatly improved solubility and dispersibility of resveratrol in water, as indicated by a 3.12-fold enhancement over the solubility in the presence of 0.014 M SLD. This study provided a new strategy for solving the solubility problem of LD and opens possibilities for new design of the fine structure of starch-like materials.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2022
·
IF 1.193
Guan-Ting XU,Tian-Sheng ZHAO,Kun ZHANG,Li-Zhen GUO,Yong-Qin HE,Jian-Hua HU,Yi-Jing LIAO,Xi MAI,Na LI
Iron ions (Fe 3+ ) and ascorbic acid (AA) are of great significance to living organisms. Herein, carbon dots (C-dots)-based “off-on” fluorescent probe was designed for Fe 3+ and AA analysis. In presence of Fe 3+ , the fluorescence of C-dots was immediately quenched, and the quenching mechanism was deduced to be inner filter effect (IFE). The fluorescent C-dot probe shows response to Fe 3+ in range of 10–500 µM with a limit of detection (LOD) of 0.9 µM. Interestingly, when AA was introduced to the C-dots-Fe 3+ system, the fluorescence of C-dots was significantly recovered, which could be ascribed to the oxidation-reduction reaction between Fe 3+ and AA. Based “off-on” fluorescent C-dots probe, the linear range of 5–500 µM was obtained with LOD of 0.4 µM. Moreover, the AA-induced fluorescence enhancement can be recognized by smartphone, which greatly extends the application in resource-limited areas.
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ANALYST
·
2022
·Vol. 147
·期 24
·5655-5662
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IF 5.227
Ying Zhou,Ruichun Li,Guomei Zhang,Yan Zhang,Caihong Zhang,Shaomin Shuang
Metal–organic frameworks (MOFs) have emerged as interesting nanomaterials owing to their large surface area, high porosity, tunable pore architecture and easy functionalization. However, an inferior electrical conductivity hinders their application in electrochemical sensing. In this paper, gold–palladium alloy/UiO-66-NH2/graphene (AuPd/UiO-66-NH2/GN) composites were synthesized by loading alloys on the surfaces of MOFs and then attaching them to the graphene surface. The addition of metal nanoparticles and graphene enhanced the electron transfer ability of MOFs. Then, composites were used to modify a glassy carbon electrode (GCE) to construct a sensitive dopamine (DA) electrochemical sensor. The developed sensor manifested two linear relationships in lower concentration ranges and in higher concentration ranges with a 0.21 × 10−6 mol L−1 low detection limit (3σ/k) under optimal conditions. The results certified that the constructed sensor had high selectivity, excellent reproducibility and good stability, and had been used successfully for DA detection in actual human serum samples.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Haotian Ma,Li Guan,Mingjun Chen,You Zhang,Yue Wu,Zhenyang Liu,Dawei Wang,Fenghe Wang,Xu Li
The utilization of biomass is an important approach to supplying sustainable carbon sources for green chemistry, by which the product could be more environmentally friendly and lower toxicity. In this work, the local fruit Mopan persimmons were used to be a carbon source to prepare carbon quantum dots (MP-CQDs) via the hydrothermal method. A series of characteristics were applied to the carbon dots to study the structural and optical properties. The results demonstrated that the MP-CQDs were well synthesized and coated by N, O-related surface functional groups. The PL of MP-CQDs showed an excitation-dependent behavior, whose peak shifted from 446 nm to 545 nm under the excitation wavelength from 350 nm to 450 nm. After a selectivity study on different metal ions, we found that MP-CQDs were sensitive to Fe 3+ ions, and the limit of detection (LOD) was determined as 0.324 μM with the 3σ rule. Further, by mixing MP-CQDs with sugar, we successfully applied MP-CQDs to the anti-counterfeiting field by painting anti-counterfeiting patterns with the combination of commercial fluorescent ink (CFI) and MP-CQDs@sugar ink (MPI). The pattern can present different fluorescent properties under 365 nm, 395 nm, and 450 nm respectively. The results revealed that biomass-derived MP-CQDs were a promising candidate for Fe 3+ ions detection and anti-counterfeiting application.
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MICROCHIMICA ACTA
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2022
·Vol. 189
·期 11
·1-8
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IF 6.408
Li Shuhuai,Wu Yuwei,Pang Chaohai,Ma Xionghui,Wang Mingyue,Luo Jinhui,Zhi Xu,Li Bei
A highly sensitive kanamycin electrochemiluminescence (ECL) switch sensor was constructed. A signal element consisting of ordered mesoporous carbon loaded with indium oxide nanoparticles/carbon quantum dots (OMC/In 2 O 3 /C-dots) was assembled on the surface of a gold electrode. Then, a molecularly imprinted polymer (MIP) was prepared on the modified electrode surface using kanamycin as the template molecule and o -aminophenol as the functional monomer. After kanamycin elution, the prepared sensor retained specific kanamycin recognition sites. OMC/In 2 O 3 effectively amplified the ECL signal of the C-dots, thereby enhancing the detection sensitivity, whereas kanamycin quenched the signal. Therefore, the imprinted sites acted as a switch, providing a new method for detecting kanamycin. Under the optimal experimental conditions, the concentration of kanamycin was proportional to the degree of ECL quenching within a linear range of 5–4500 × 10 −12 mol L −1 at 0.8 V (vs. Ag/AgCl electrode electrode), and the detection limit was 5.8 × 10 −13 mol L −1 . When applied to the detection of kanamycin in actual samples, such as chicken, duck, pork, and milk, the recovery for spiked samples was in the range 92.7–110%. Graphical abstract
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CHEMOSPHERE
·
2022
·
IF 8.943
Zhongbao Ma,Long-Fei Ren,Diwen Ying,Jinping Jia,Jiahui Shao
The separation of hardness ions such as calcium and magnesium from hard water can improve water quality, which is important but technically challenging. Nanofiltration (NF) has attracted much attention because of its efficiency, environmental friendliness and low cost. However, common NF membranes with a singly (either positively or negatively) charged layer have insufficient water softening capacity. In this work, two types of dual-layer Janus charged polyamide NF membranes composed of oppositely charged inner and outer layers were developed for the first time by sequential electrospray polymerization strategy for efficient water softening. The effect of the microstructure of the dually charged barrier layer on the separation performance of divalent salt ions was explored. Detailed mechanistic studies revealed that the microstructure of the outer layer of the barrier layer played a crucial role in the ion separation of the Janus membrane due to its control of the reverse transport of ions. Janus charged polyamide NF membrane with a loose outer layer exhibited better water softening performance (93.6% of hardness removed) compared to the singly charged NF membranes due to the simultaneous dual electrostatic effect and no ion reverse transport confinement. This Janus charged NF membrane also possessed good antifouling performance, mainly due to its negatively charged outer layers. The mechanistic insights gained in this study reveal the huge potential of microstructural design toward high-performance Janus charged NF membranes, and provide important guidance on the future development of high-efficiency water softening NF membranes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
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IF 7.2
Chuanyi Cui,Jiang Li,Yi Wang,Peng Jiang,Weimin Li,Gaokuo Zhong,Xinyao Yang,Zheng Xing,Xin Wang,Ming Ma
Photoanode materials typically exhibit good stability and environmentally and economically properties in solar water splitting cells, while they always suffer from the narrow light absorption range, heavy surface charge combination and sluggish surface reaction kinetics . Herein, we design an efficient and reproducible photoanode by stacking amorphous carbon spheres (CSs) and cobalt-involved carbon nitrides (Co-CNs) on surface of TiO 2 nanorod arrays. CSs work as light sensitizer for broadening the light absorption range of photoanode and promoting the utilization of solar energy, which further improved by Co-CNs partially. In addition, CSs increase the conductivity of photoanode, as a transport channel for improving the charge migration. Co-CNs introduce many active sites on surface of photoanode for facilitated solar water oxidation . The best constructed TiO 2 /CSs/Co-CNs photoanode exhibits an impressive photocurrent density of ∼1.73 mA/cm 2 (at 1.23 V vs RHE). The staking method of various functional materials provides one promising strategy for the modification of catalysts.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Yiyi Chen,Haixi Lu,Honghui Shi,Junli Zhu,Haifeng Wang
A novel improved up-conversion nanoparticles-based immunochromatographic assay (IUCNPs-ICA) was developed for the detection of zearalenone (ZEN). Lu 3+ -doped UCNPs were synthesized using the solvothermal method, and the UCNPs doped with 30 % Lu 3+ displayed optimal optical properties. The IUCNPs-ICA was subsequently developed for the detection of ZEN in cereals under optimized conditions. The detection time and limit of detection (LOD) were 10 min and 0.1 μg/L, respectively. Moreover, a good linear relationship was observed from 0 to 100 μg/L ZEN (r 2 = 0.9946) and high specificity for other mycotoxins. LODs in spiked maize and wheat reached 0.16 μg/kg, and recovery rates were 82.11–100.76 % and 79.64–98.51 %. There was good consistency between the results of IUCNPs-ICA, colloidal gold-ICA, and high-performance liquid chromatography (HPLC) in the detection of natural cereal samples. The collective results support the utility of IUCNPs-ICA as a reliable on-site screening method for ZEN residue analysis in various cereals.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 9
·2603-2610
·
IF 4
Yue Zhang,Pengkun Xia,Hui Fan,Xiaohui Gao,Fangping Ouyang,Wei Chen
A glucose sensor with high sensitivity and low detection limit is vital for human beings’ health. Herein, a CoO nanoneedle array with an unique electronic structure was successfully constructed by a hydrothermal and subsequent high-temperature calcination process. The optimized CoO-400 nanoneedles exhibit a larger electrochemical active surface area, beneficial electronic structure, favorable lattice distortion, and abundant active sites, which effectively promote electrochemical properties toward glucose sensing. The glucose sensor constructed by CoO-400 nanoneedles shows a high sensitivity of 84.23 mA cm−2 mM−1 and low detection limit of 4.4 × 10−7 M, superior to the results from most previous reports. Moreover, outstanding anti-interference ability, superior long-term stability, good repeatability, and satisfactory reproducibility in glucose detection for CoO-400 nanoneedles are also demonstrated.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 98
·期 3
·773-781
·
IF 3.709
Wei Zhang,Zheng Shen,Ling Kong,Wenbo Chen,Minyan Gu,Meng Xia,Wenjie Dong,Yalei Zhang
BACKGROUND The conversion of glucose into 5-hydroxymethylfurfural (5-HMF) involves the isomerization of glucose to fructose catalyzed by Lewis acid and subsequent dehydration of fructose catalyzed by Brönsted acid. In this work, in order to obtain a high yield of 5-HMF, a series of Sn-Al-Beta catalysts containing both Lewis and Brönsted acid sites were prepared by a convenient solid state ion exchange (SSIE) method using partially dealuminated Beta zeolite and tin(II) acetate. RESULTS The obtained bifunctional catalysts were investigated for one-pot production of 5-HMF from glucose in the ionic liquid (IL) [C 4 mim]Cl. Among various catalysts, Sn-Al-Beta- 4 - 8 exhibited the best catalytic performance, giving a 5-HMF yield of 54% under optimal reaction conditions (393 K, 2 h), along with a glucose conversion of 81%. The Sn-Al-Beta- 4-8 catalyst and IL were regenerated by the extraction of 5-HMF, and the reactivity was reserved after five runs of recycling. In addition to glucose, the Sn-Al-Beta- 4-8 /[C 4 mim]Cl system was also proven to have the potential to effectively convert other carbohydrates into 5-HMF. CONCLUSION The results suggested that the catalyst is convenient to prepare and has preferable efficiency and stability in the conversion of carbohydrates into 5-HMF. © 2022 Society of Chemical Industry (SCI).
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