COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Minjing Xu,Shuaishuai Ma,Jin Li,Meng Yuan,Jiamin Gao,Jinjuan Xue,Mingxin Wang
Oily wastewater causes serious pollution to the environment and has aroused widespread concern. Hereby, a novel, sustainable and hydrophobic 3D polydimethylsiloxane modified MoS 2 @biomass-derived carbon composite (PMC) was fabricated by simple hydrothermal carbonization , self-assembly, freeze-drying, and hydrophobic modification methods based on natural renewable resources. With a water contact angle of 147.2°, the PMC exhibits excellent hydrophobic and oleophilic properties and further processes high adsorption capacity for various organic solvents and oils, and the maximum volume adsorption capacity reached up to 98.5% (v v −1 ). Moreover, the PMC can maintain a high oil-absorption capacity even after 10 cycles, showing good recoverability and reusability. In addition, the as-prepared PMC also can be applied in the removal of water-soluble organic pollutant . Benefiting from its facile fabrication and excellent properties, the developed PMC can be a promising candidate for broad environmental applications.
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SURFACE & COATINGS TECHNOLOGY
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2022
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IF 4.865
Rui Fang,Runjia Liu,Zhi-Hui Xie,Liang Wu,Yuejun Ouyang,Mingqi Li
To improve the corrosion protection of a nickel-based coating to the underlying magnesium alloy , a superhydrophobic nickel‑phosphorus/nickel/fluorinated polysiloxane (PFDTMS) triple-layer composite coating was successfully designed and fabricated on AZ31 magnesium alloy . The composite coating consists of an electroless-deposited nickel‑phosphorus (ELNi) bottom layer, an electrochemically deposited nickel (ECNi) nano-cone array middle layer, and a PFDTMS top layer via a dehydration-condensation reaction of silane . The surface morphology , structure, and chemical composition of the coating are identified by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The static water contact angle (WCA) of the composite coating is 153.0 ° ± 4.6 ° , attributed to the synergistic effect between nano-cone-shaped nickel and PFDTMS layer. Compared to the untreated magnesium alloy, the corrosion current density of the coating decreases by four orders of magnitude based on the Tafel curve, and the corresponding impedance modulus at low frequency (| Z | ƒ=0.01 Hz ) increases by almost four orders of magnitude based on the electrochemical impedance spectra (EIS), demonstrating the superior corrosion protection to magnesium alloy. Lastly, the wetting states of the water droplets on the nickel‑phosphorus layer with and without electrodeposition of nickel nano-cone array and silane modification are also discussed in detail.
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CHIRALITY
·
2022
·Vol. 34
·期 3
·537-549
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IF 2.183
Lidi Gao,Xuan Zhao,Shili Qin,Qing Dong,Xingfang Hu,Hongtao Chu
Covalent organic frameworks (COFs) have been recognized as promising solid phases in capillary electrochromatography (CEC). Imine-based COF-coated open-tubular CEC column (COF TpBD-coated OT column) was prepared and characterized by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectra, thermogravimetric analysis (TGA), nitrogen adsorption/desorption (Brunauer–Emmett–Teller [BET]), and scanning electron microscopy (SEM). The results showed that the column efficiency was up to 26,776 plate/m, and the thickness of stationary phase was about 6.00 μm for the column prepared under the optimal conditions. Enantioseparation of 15 kinds of the single chiral compounds (histidine, arginine, lysine, leucine, threonine, methionine, valine, aspartic acid and glutamic acid, fipronil, diclofop, imazamox, quizalofop-p, imazethapyr, and acephate) and 3 kinds of mixed amino acids racemaces (valine, methionine, and glutamic acid) were performed with three methods: capillary electrochromatography with COF TpBD-coated OT column (Method 1), CEC with COF TpBD-coated OT column as the separation channels, and capillary electrophoresis (CE) with HP-β-CD as the chiral mobile phase additive (Method 2) and CE with HP-β-CD as the chiral mobile phase additive (Method 3). Separation efficiency and chiral selectivity of Method 2 was best among the three methods. Under the optimal separation conditions of Method 2, all the enantiomers reached the baseline separation regardless of the single chiral compounds or the mixed amino acids. Relative standard deviation (RSDs) of the mean column efficiency for reproducibility and stability was in the range of 0.46–1.49%. This combination of CEC and CE has great potential for use in chiral separation.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
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IF 5.141
Hao Zhang,Hongjie Zhu,Haitao Zhao,Mingyu Dou,Xingliang Yin,Hua Yang,Dacheng Li,Jianmin Dou
Photocatalytic water splitting to produce hydrogen has gradually become a research hotspot in recent years, and molecular cocatalysts especially cobalt-based complexes as proton reduction cocatalysts have attracted wide attention due to their high activity and selectivity. In this study, CdS nanorods were employed as photosensitizers, and a novel dinuclear cobalt-bis(thiosemicarbazone) complex with definite structure was used as a cocatalyst to improve visible-light-driven hydrogen evolution. Under the optimum conditions, this noble metal-free system exhibited an average hydrogen evolution rate of 1045 μmol·h −1 in 8 h irradiation. This system could work for 24 h with a TON of 16,400, and the average apparent quantum yield of this system is ∼21% at 420 nm. On the basis of photoelectrochemical studies and electrochemical analysis, we proposed a possible mechanism for hydrogen production in this three-component system.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 16
·2110853
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IF 19.924
Simi Sui,Haonan Xie,Ming Liang,Bochao Chen,Chunyang Liu,Enzuo Liu,Biao Chen,Liying Ma,Junwei Sha,Naiqin Zhao
Constructing sodium-ion battery anodes with efficient ion/electron transport and high cycling stability is significantly promising for applications but still remains challenging. Here, “three-in-one” multi-level design is performed to develop a carbon-coated phosphorous-doped MoS 2 anchored on carbon nanotube paper (P-MoS 2 @C/CNTP). The Na + diffusion and electron transport, as well as the structural stability of the whole anode are simultaneously enhanced through the synergistically optimization of P-MoS 2 @C/CNTP at atomic, nanoscopic, and macroscopic levels. Resulted from the multi-level modification, the synergetic mechanism has been demonstrated by electrochemical measurement and theoretical calculation. As a result, the free-standing P-MoS 2 @C/CNTP anode presents a high rate performance (150 mA h g −1 at 5 A g −1 ) and a long cycling life (1 A g −1 , 1200 cycles, 249 mA h g −1 ). This work provides a new approach to the design and fabrication of high-performance conversion-type electrode materials for rechargeable batteries application.
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Small
·
2022
·Vol. 18
·期 43
·2106904
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IF 15.153
Zhong Wu,Yanhui Feng,Zhenbo Qin,Xiaopeng Han,Xuerong Zheng,Yida Deng,Wenbin Hu
Development of efficient non-noble metal catalysts for water splitting is of great significance but challenging due to the sluggish kinetics of the hydrogen evolution reaction (HER) in alkaline medium. Herein, a bimetallic multi-level layered catalytic electrode composed of Ni 3 S 2 nanosheets with secondary Co-NiOOH layer of 3D porous and free-standing cathode in alkaline medium is reported. This integrated synergistic catalytic electrode exhibits excellent HER electrocatalytic performance. The resultant Ni 0.67 Co 0.33 /Ni 3 S 2 @NF electrode displays the highest HER activity with only overpotentials of 87 and 203 mV to afford current densities of 10 and 100 mA·cm −2 , respectively, and its Tafel slope is 80 mV·dec −1 . The chronopotentiometry operated at high current density of 50 mA·cm −2 shows negligible deterioration, indicating better stability of Ni 0.67 Co 0.33 /Ni 3 S 2 @NF electrode than Pt/C (20 wt.%). Such a desirable catalytic performance is attributed to the modification of physical and electronic structure that exposes abundant active sites and improves the intrinsic catalytic activity toward HER, which is also confirmed by electrochemically active surface area and X-ray photoelectron spectroscopy analysis. This work provides a strong support for the rational design of high-performance bimetallic electrodes for industrial water splitting.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Jianfeng Wang,Jun Li
The traditional PP separator is failed to inhibit the polysulfide shuttle effect for the lithium-sulfur ctteries. Besides, it has poor safety porblem when used at high temperatures. Therefore, it is urgent to develop new modified separator to repalce the traditional separator. To deal with these problems, layered hierarchical C@MoS 2 spheres are prepared and modified the traditional separator. Due to the presence of the C@MoS 2 modified separator, the Li-S batteries with C@MoS 2 separator display high specific capacity and superior cycling stability even at high rate of 2C. The high electrochemical performance is attributed to efficient inhibition of shuttle effect by the adsorption and catalytic conversion of polysulfide on the C@MoS 2 separator. This work has a certain reference value for the future large-scale application of lithium-sulfur battery.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Shizong Wang,Jianlong Wang
Cobalt sulfides as persulfate activator have received increasing interest in the field of persulfate-based advanced oxidation process. In this study, Co 9 S 8 anchored in N, S, O heteroatoms co-doped carbon (CoSx@N-S-O-C) composite was prepared with different sulfur precursors (sulfur, thiourea, thiophene and benzyl disulfide), and used to activate peroxymonosulfate (PMS) for sulfamethoxazole (SMX) degradation. The effect of temperature, pH, inorganic ions, humic acids and water components on SMX degradation was investigated. The results showed that sulfur precursor could regulate the catalytic activity of the composite through changing the cobalt speciation and carbon structure. The catalytic activity was highest when the molar ratio of sulfur to cobalt was 5:1 (CoS x @N-S-O-C-5). Sulfate radicals (dominant) and hydroxyl radicals contributed to SMX degradation. The intermediate products during SMX degradation were identified, and the possible pathway of SMX degradation was proposed. Pyridinic N, Co-N, cobalt, S 2− , S 2 2− , C-S-C and C-SO x were active sites for PMS activation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Shaodong Sun,Dong Ren,Man Yang,Jie Cui,Qing Yang,Shuhua Liang
Constructing direct Z-scheme heterostructure is an effective way to promote the separation of photogenerated carriers and optimize the redox ability of the photocatalytic system. This work reports the in-situ synthesis of sea-urchin-like ZnS/SnO 2 Z-scheme heterojunctions via a one-step hydrothermal method . Both experimental results and density functional theory (DFT) calculations indicate that the tight interfaces derived from in-situ precursor dissociation can ensure a fast transfer for photogenerated carriers, meanwhile, the Z-scheme type of heterojunctions can increase the carrier separation efficiency and maintain the high reduction ability of photogenerated electrons. As expected, the photocatalytic hydrogen evolution rate of the as-optimized ZnS/SnO 2 sample can reach 2.17 mmol g −1 h −1 , which is 15.5 times higher than that of the commercial ZnS. This work can offer a novel strategy for designing Z-scheme heterojunction as well as controlling the contact interface for boosted photocatalytic activity .
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Da Chen,Shuaibin Shao,Wei Zhang,Jingbo Zhao,Meiling Lian
The development of functional nanomaterials based on the unique structure and morphology of MXene for biosensing has aroused great interest. In this work, using thiourea as the doping source, a new structure composed of nitrogen and sulfur co-doped on the surface of Ti 3 C 2 nanosheets was synthesized through a simple one-step synthesis method. Fortunately, the obtained nitrogen and sulfur co-doped Ti 3 C 2 nanosheets (NS–Ti 3 C 2 NSs) showed excellent peroxidase-like activity and electrochemical activity. The catalytic mechanism of modified Ti 3 C 2 nanosheets was explored. It is revealed that the catalytic mechanism of NS-Ti 3 C 2 NSs is composed of two important parts: the dissociation and adsorption of H 2 O 2 and the protonation of TMB. In addition, the fabricated NS-Ti 3 C 2 NSs-based electrochemical biosensor is superior to the counterpart from Ti 3 C 2 nanosheets, indicating that the doping of nitrogen and sulfur elements provides more active sites and promotes electron transport efficiency. Combining the unique advantages of colorimetry and electrochemical technology , we have developed a fast, accurate, intuitive and efficient UA detection method for uric acid in the range of 2 μM–400 μM with a detection limit (LOD) of 0.19 μM. The established sensing platform in this study prove the possibility of the doping method for the development of MXene-based biosensors with high sensitivity and high performance, and pave the way for the future development of biosensors for biomedical fields.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 5
·1006-1015
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IF 7.779
Guoqing Zhu,Pan Zheng,Man Wang,Weilin Chen,Chunxia Li
Because of low synthesis cost, facile fabrication, good stability, and controllable catalytic activities, nanozymes have been extensively studied and have been proven effective for cancer therapy. However, the relatively low catalytic activity at room temperature and single function of nanozymes limit their application in cancer treatment. Designing an efficient multifunctional nanozyme for cancer treatment is still urgent. Herein, novel and multifunctional CuCoS nanoparticles (CuCoS NPs) were rationally designed and successfully prepared. The CuCoS NPs not only exhibit an excellent photothermal conversion effect under 808 nm laser irradiation, but also act as a peroxidase and glutathione oxidase and perform H2O2 catalysis and GSH scavenging in tumor microenvironments. After laser irradiation, CuCoS NPs can rapidly increase the temperature through the excellent photothermal effect, and the elevated temperature improves the catalysis of CuCoS nanozymes, resulting in the breaking of the redox balance in cells through catalyzing H2O2 to produce ˙OH and depleting GSH to decrease the consumption of ˙OH, realizing a significant antitumor effect. This work provides a temperature-augmented multifunctional nanozyme for synergistic photothermal and chemodynamic therapy and contributes to the development of multifunctional nanomaterials by rational design.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2022
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IF 5.895
Hang Jia,Xuejun Zeng,Rui Cai,Zhouli Wang,Yahong Yuan,Tianli Yue
The risk of fruit juice contamination caused by microorganisms, especially Alicyclobacillus acidoterrestris, has been reported worldwide. To develop cost-effective control methods, in this work, flower-like magnetic molybdenum disulfide (Fe3O4@MoS2) nanoparticles (NPs) were fabricated by a facile two-step hydrothermal method. After further modifying polyacrylic acid (PAA) on the surface of the NPs, epsilon-polylysine (EPL) was immobilized via N-(3-dimethylaminopropyl)-N-carbodiimide hydrochloride/N-hydroxysuccinimide coupling reaction to obtain the Fe3O4@MoS2@PAA–EPL nanocomposites. Antibacterial results exhibited that the synthesized nanocomposites showed effective antibacterial activity against A. acidoterrestris with a minimum inhibitory concentration of 0.31 mg mL–1. Investigation on the antibacterial mechanism revealed that the presence of nanocomposites caused damage and disruption of the bacterial membrane through dent formation, resulting in the leakage of intracellular protein. Moreover, the activity of dehydrogenase enzymes was inhibited with the treatment of Fe3O4@MoS2@PAA–EPL, causing the reduction of metabolic activity and adenosine triphosphate levels in bacteria. Simultaneously, the presence of nanocomposites improved intracellular reactive oxygen species levels, and this disrupted the antioxidant defense system and caused oxidative damage to bacteria. Furthermore, Fe3O4@MoS2@PAA–EPL nanocomposites were confirmed to possess satisfactory biocompatibility by performing in vitro cytotoxicity and in vivo acute toxicity experiments. The aim of this research was to develop a new pathway for the inhibition of A. acidoterrestris in the juice industry.
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