APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Feng Zhou,Jiadong Chen,Yun Yang,Xiaofeng Ke,Xue Liu,Lijie Zhang,Jun Li,Huile Jin,Shun Wang,Ying Li,Chenliang Su
Development of Ru-based electrocatalysts for acidic oxygen evolution reaction without a trade-off between activity and durability remains challenging. Herein, we constructed Co 3 O 4 /RuO 2 heterojunctions anchored on carbon (Co 3 O 4 /RuO 2 -C) with a low Ru loading (2.74 wt%), in which strong coupled p-n junctions facilitated electron transfer from RuO 2 to Co 3 O 4 . The Co 3 O 4 /RuO 2 -C demonstrated a low overpotential of 170 mV at 10 mA cm −2 and long-term stability in 0.1 M HClO 4 due to its unique structure. The origin of its high performance in acidic OER was revealed by the combination of in-situ attenuated total reflection infrared and Raman tests. Concretely, oxygen generation for Co 3 O 4 /RuO 2 -C was dominated by the adsorbate evolution mechanism, and the introduction of Co 3 O 4 facilitated the redox of RuO 2 , generating active sites for OER. Theoretical calculations further substantiated that the Co 3 O 4 /RuO 2 heterojunctions possessed lower energy barriers for OER. This work provides a compelling synthesis route for effective and stable electrocatalysts for acidic OER.
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BIOSENSORS & BIOELECTRONICS
·
2023
·
IF 12.6
Caixia Sun,Xue Zhang,Hao Huang,Ya Liu,Xianwei Mo,Yufei Feng,Jiahong Wang,Wenhua Zhou,Paul K. Chu,Xue-Feng Yu,Wenxin Liu
Nanozymes with enzyme-like characteristics have drawn wide interest but the catalytic activity and substrate selectivity of nanozymes still need improvement. Herein, Se-vacancy-rich TiSe 2-x @Au nanocomposites are designed and demonstrated as nanozymes. The TiSe 2-x @Au nanocomposites show excellent peroxidase-like activity and the chromogenic substrate p-phenylenediamine (PPD) can be selectively oxidized to compounds that exhibit an absorption peak at 413 nm that differs from that of self-oxidation or generally oxidized species, suggesting high catalytic activity and strong substrate selectivity. Theoretical calculations reveal that the PPD adsorption geometry at Se vacancies with an adsorption energy of −3.00 eV shows a unique spatial configuration and charge distribution , thereby inhibiting the free reaction and promoting both the activity and selectivity in PPD oxidation . The TiSe 2-x @Au colorimetric system exhibits a wide linear range of 0.015 mM–0.6 mM and a low detection limit of 0.0037 mM in the detection of glucose. The blood glucose detection performance for human serum samples is comparable to that of a commercial glucose meter in the hospital (relative standard deviation < 6%). Our findings demonstrate a new strategy for rapid and accurate detection of blood glucose and our results provide insights into the future design of nanozymes.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ling Sun,Chenghao Yang,Huixin Wang,Xin Jin,Xu Li,Xiangji Liu,Ping Zhu,Chaohong Dong
Imparting flame retardancy to polyester fabrics is still a pressing issue for the textile industry. To this end, a composite coating was developed by phosphite, pentamethyldisiloxane, urea and sodium alginate , and then applied together with calcium chloride to prepare flame-retardant polyester fabrics. The optimized polyester fabrics named PF-HUSC exhibited a rough surface with P, Si, N and Ca element distributions, as observed by scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDX). Flame retardancy evaluations showed that the damaged length of PF-HUSC with a limiting oxygen index (LOI) value of 35.3 ± 0.3 % was reduced from the contrastive 17.6 ± 0.4 cm to 4.6 ± 0.2 cm after vertical burning test. Thermogravimetric (TG) test confirmed that PF-HUSC retained a char residue as high as 35.1 % at 700 °C. Cone calorimetry test displayed that the total heat release (THR) and total smoke production (TSP) values of PF-HUSC were reduced to 3.1 MJ/m 2 and 1.1 m 2 , respectively, as compared to those of pure polyester fabrics. More importantly, PF-HUSC still exhibited higher LOI value than that of pure polyester fabrics after 25 washing cycles. Hence, the coating scheme is considered as a new method to expand the preparation of flame-retardant polyester fabrics.
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MOLECULES
·
2021
·Vol. 26
·期 8
·2208
·
IF 4.412
Muhammad Sajid,Muhammad Rizwan Dilshad,Muhammad Saif Ur Rehman,Dehua Liu,Xuebing Zhao
Furfural is one of the most promising precursor chemicals with an extended range of downstream derivatives. In this work, conversion of xylose to produce furfural was performed by employingp-toluenesulfonic acid (pTSA) as a catalyst in DMSO medium at moderate temperature and atmospheric pressure. The production process was optimized based on kinetic modeling of xylose conversion to furfural alongwith simultaneous formation of humin from xylose and furfural. The synergetic effects of organic acids and Lewis acids were investigated. Results showed that the catalystpTSA-CrCl3·6H2O was a promising combined catalyst due to the high furfural yield (53.10%) at a moderate temperature of 120 °C. Observed kinetic modeling illustrated that the condensation of furfural in the DMSO solvent medium actually could be neglected. The established model was found to be satisfactory and could be well applied for process simulation and optimization with adequate accuracy. The estimated values of activation energies for xylose dehydration, condensation of xylose, and furfural to humin were 81.80, 66.50, and 93.02 kJ/mol, respectively.Keywords:catalysis;chlorides;furfural;kinetics;lewis acid;p-toluenesulfonic acid;xylose
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JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2021
·Vol. 98
·期 6
·673-682
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IF 1.849
Changqing Miao,Yanbo Wang,Zhiying Ma,Yang Luo,Yu Miao,Pingfang Yuan,Jiao Guo,Gairong Chen,Hongbo Liu
In this study, poly( p- phenylenediamine) (PPDA) was synthesized by an enzymatic polymerization method using p- phenylenediamine as the monomer in the water phase. The PPDA structure was characterized by infrared (IR), gel permeation chromatography, and elemental analysis. The antioxidation behavior of the as-synthesized PPDA in biodegradable castor oil was investigated using a rotary oxygen bomb test and pressurized differential scanning calorimetry. A theoretical calculation was conducted to investigate its antioxidation mechanism. PPDA was found to exhibit excellent oxidation resistance in castor oil at 150 °C, which effectively prolonged the oxidation induction time of the oil. The results obtained herein suggest that as with phenolic antioxidants, PPDA with a hindered structure effectively improves the antioxidation performance of the oil by enhancing the stability of nitrogen free radicals.
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CHEMOSPHERE
·
2021
·
IF 7.086
Lin Zhou,Faqin Dong,Wei Zhang,Yuheng Chen,Lei Zhou,Fei Zheng,Zhenzhen Lv,Jingyuan Xue,Dengliang He
The biosorption and biomineralization behavior of U(VI) by Kocuria rosea with uranium resistance higher than other general microorganisms was investigated in this study. The results showed the obvious effects of initial U(VI) concentration, biomass, time, and especially pH, and presented that U(VI) was immobilized to K. rosea by physical and chemical action. The characterization results for the precipitation proved that U–P minerals with U(VI) (H 3 OUO 2 PO 4 ·3H 2 O, H 2 (UO 2 ) 2 (PO 4 ) 2 ·8H 2 O) or U(IV) (CaU(PO 4 ) 2 ) were dominant, and the crystallization level increased with time. In the process, the phosphorous containing groups, amino, hydroxyl and carboxyl groups played important roles in adsorption of U(VI), and the phosphate groups were crucial in immobilization of uranium, showing the importance of groups containing phosphorus in both biosorption and biomineralization processes. Our findings focus on the biosorption and biomineralization mechanism of U(VI) by K. rosea , emphasize the synergy of physical adsorption and chemical immobilization in the process and formation of U(VI)–P and U(IV)–P minerals, and highlight the significance of phosphorus involvement in the reaction.
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MATERIALS & DESIGN
·
2021
·
IF 7.991
Youyou Huang,Jianan Zhang,Yue Zhang,Ling Shi,Xiru Qin,Bing Lu,Yue Ding,Yang Wang,Tingting Chen,Yong Yao
Multi-drug resistance (MDR) in tumor therapy often leads to relatively low efficiency of the current chemotherapeutics, attributing to the overexpression of P-glycoprotein (P-gp) increases the efflux of anticancer drugs out of the cells. To address this obstacle, herein, a photothermal-triggered nitric oxide (NO) gas releasing nanosystem was designed for reversing drug resistance in MDR cells based on mesoporous core–shell structured nanocomposites (MCSN) of Cu 2-x [email protected] 2 . The mesoporous shell provided the modification and encapsulation capacity for the NO donor— S -nitrosothiol (SNO) and doxorubicin (DOX) loading. Besides, the heat generated from the photothermal conversion of Cu 2-x Se could trigger NO gas generation and enhance DOX release in the acid microenvironment of cancer cells. The released NO gas in the cytoplasm could induce mitochondrial dysfunction to block adenosine triphosphate (ATP) synthesis and ATP-dependent drug efflux, thereby overcoming MDR. Therefore, this novel gas/chemo/photothermal triple-combination therapeutic nanoplatform is expected to be a potentially effective strategy against MDR and may reveal new insights for other NO gas-relevant medical applications.
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Nano Energy
·
2021
·
IF 17.881
Liqin Yao,Zhao Zhang,Qi-long Zhang,Zheng Zhou,Hui Yang,Lu Chen
A lot of efforts have been devoted to enhance the outputs of triboelectric nanogenerators (TENGs) via optimizing the friction materials in recent years. Here, the modified organic polystyrene (PS) microspheres embedded Poly[(vinylidene fluoride)-co-trifluoroethylene] P(VDF-TrFE) composites are developed to construct lotus-leaf surface microstructure and enhance the permittivity of P(VDF-TrFE). Besides, owing to the rich positively charged -NH 3 groups of the hexadecyl-trimethyl-ammonium-bromide (CTAB) in the solvent, the surface potential of composites is significantly improved by CTAB modified PS microspheres. Coupling of designed surface microstructure, high permittivity, and enhanced surface potential, the TENG assembled by P(VDF-TrFE) (+) and Polytetrafluoroethylene (PTFE, -) exhibits considerable outputs (the short-circuit current density and peak power density are 47.45 mA/m 2 and 7.88 W/m 2 , respectively), much higher than those of pristine P(VDF-TrFE) and unretouched PS/P(VDF-TrFE). In the applications, 413 LEDs in series can be lighted up directly by the TENG without energy storage. A smart mouse pad is also proposed to work as the self-powered sensor to detect typical mouse motions. This research provides a comprehensive solution to optimize the positive friction material in simple and feasible methods of surface/interface design and surface potential regulation.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 7
·3508-3514
·
IF 3.591
Dongxiu Wang,XiPing Mei,Songbai Wang,Junfen Li,Chuan Dong
N,P-codoped carbon dots (N,P-CDs) are obtained by a one-pot hydrothermal synthesis strategy using L-arginine and phosphoric acid as the raw materials. The resulting N,P-CDs show good water-solubility and perfect luminescence properties with a high fluorescence quantum yield (18.38%). The maximum emission intensity of CDs is obtained at 444 nm with an excitation of 340 nm. Based on the mechanism of inner filter effect (IFE), CDs are used as an efficient and selective fluorescence sensor for the detection of vitamin B12 (VB12). The linear response of CDs towards VB12 is obviously widened in the range of 1.99–98.6 μM and 98.6–176 μM, and the limit of detection (LOD) is 59 nM. This method is well applied to detect VB12 in two types of vitamin pills and blood serums. In addition, it can be used to bioimaging HeLa cells.
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Polish Journal of Chemical Technology
·
2020
·Vol. 22
·期 4
·61-68
·
IF 1.193
Xiaonan Deng,Sihong Ye,Kun Liu,Changfeng Li,Fangzhi Liu,Xiaoming Yan
To collect permeability data and establish its database of fertilizer nutrients and water vapor through different polymer membranes for the development of polymer-coated fertilizer, the permeabilities of N-, P-, and K-nutrient from saturated aqueous of urea, NaH2PO4 and KCl solution and the permeability of water vapor through the membranes of poly lactic acid (PLA), its blends with polystyrene (PS), and its composites with humic acid (HA) particles were determined experimentally at the temperatures of 288, 298, and 308 K, respectively. The effects of the addition of PS and HA particles, temperature, and coating thickness on the permeability of fertilizer nutrient and water vapor were investigated. It was found that the addition of PS and HA increased the permeability for both the fertilizer nutrients and water vapor. The increase in temperature raised the permeability of N-, P-, and K-nutrient while decrease the permeability of water vapor in the range studied.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jia Liu,Lei Zhao,Lin Shi,Ye Yuan,Daan Fu,Zhilan Ye,Qilin Li,Yan Deng,Xingxin Liu,Qiying Lv,Yanni Cheng,Yunruo Xu,Xulin Jiang,Guobin Wang,Lin Wang,Zheng Wang
Cancer chemotherapy is challenged by multidrug resistance (MDR) mainly attributed to overexpressed transmembrane efflux pump P-glycoprotein (P-gp) in cancer cells. Improving drug delivery efficacy while co-delivering P-gp inhibitors to suppress drug efflux is an often-used nanostrategy for combating MDR, which is however challenged by cascaded bio-barriers en route to cancer cells and P-gp inhibitors’ adverse effects. To effectively breach the cascaded bio-barriers while avoiding P-gp inhibitors’ adverse effects, a stealthy, sequentially responsive doxorubicin (DOX) delivery nanosystem (RCMSNs) is fabricated, composed of an extracellular-tumor-acidity-responsive polymer shell (PEG-b-PLLDA), pH/redox dual-responsive mesoporous silica nanoparticle-based carriers (MSNs-SS-Py), and cationic β-cyclodextrin-PEI (CD-PEI) gatekeepers. The PEG-b-PLLDA corona makes RCMSNs stealthy with prolonged blood circulation time. Once tumors are reached, extracellular acidity degrades PEG-b-PLLDA, reversing nanosystem’s surface charges to be positive, which drastically improves RCMSNs’ tumor accumulation, penetration, and cellular internalization. Within cancer cells, CD-PEI gatekeepers detach to allow DOX unloading in response to intracellular acidity and glutathione and functionally act as a P-gp inhibitor, dampening P-gp’s efflux activity by impairing ATP production. Thus, the resultant high-efficacy drug delivery along with reduced P-gp function cooperatively reverses MDR in vitro. Importantly, in preclinical tumor models, DOX@RCMSNs potently suppress MDR tumor growth without eliciting systemic toxicity, demonstrating their potential of clinical translation.
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RSC Advances
·
2021
·Vol. 11
·期 3
·1233-1240
·
IF 3.361
Yong Li Tong,Bao Qian Chi,Dong Li Qi,Weiqiang Zhang
Designing electrode structures with high activity is very significant for energy conversion systems. However, single electrode materials often exhibit poor electronic transportation. To address this issue, we prepared P-Fe2O3 nanowire arrays through a convenient hydrothermal and phosphation method. The as-obtained electrode materials exhibited excellent electrocatalytic performance, which could be attributed to the P element decoration improving the reaction active sites. The as-obtained P-Fe2O3-0.45 nanowire arrays exhibited excellent OER activity with a low overpotential of 270 mV at 10 mA cm−2 (72.1 mV dec−1), excellent HER performance with a low overpotential of 126.4 mV at −10 mA cm−2, a small Tafel slope of 72.5 mV dec−1 and long durability. At the same time, the P-Fe2O3-0.45 nanowire arrays possessed a low cell voltage of 1.56 V at 10 mA cm−2.
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