MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Xiaomin Shuai,Zhiqiang Cai,Yujie Chen,Xinyu Zhao,Qianqian Song,Kaixin Ren,Xingxing Jiang,Tao Sun,Shaoqiang Hu
Here we report the first example of employing p- nitro-octadecyloxy-calix[8]arene (C8A-NO 2 ) as stationary phase for capillary gas chromatographic (GC) separations. The statically coated C8A-NO 2 column provided column efficiencies of 2554 plates/m and showed moderate polarity. Its selectivity and retention behaviour were investigated by a number of mixtures of diverse analytes and their isomers. It was found that the C8A-NO 2 column exhibited high resolving capability for aliphatic and aromatic analytes from apolar to polar nature, especially for positional and structural isomers. Among them, advantageous resolving capability over the commercial polysiloxane DB-1701 and DB-17 columns was obtained for chloroaniline and bromoaniline isomers. In addition, the C8A-NO 2 column was applied for the determination of isomer impurities in commercial reagents of geraniol, cis -decahydronaphthalene, and trans -decahydronaphthalene.
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MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Yanping Wang,Hua Yang,Xiaofeng Sun,Haimin Zhang,Tao Xian
We reported the preparation of new ternary n-BaTiO 3 /Ag/p-AgBr heterostructured photocatalysts and their promising photocatalytic application for the dye degradation. The ternary n-BaTiO 3 /Ag/p-AgBr heterostructured photocatalysts are constructed by coupling n-type BaTiO 3 and p-type AgBr particles onto Ag nanowires. Various methods including XRD, SEM, TEM, XPS, FTIR, UV–vis diffuse reflectance spectroscopy, PL spectroscopy, photocurrent response and EIS were used to characterize the as-prepared photocatalysts. The photodegradation performances of the photocatalysts were assessed by using RhB as the model pollutant and simulated sunlight as the light source. It is demonstrated that the n-BaTiO 3 /Ag/p-AgBr ternary composite photocatalysts exhibit excellent photodegradation performances superior to bare BaTiO 3 and AgBr particles. Particularly, the 20 %BTO/1.2 %Ag/AgBr composite can photocatalyze 99.3 % removal of RhB after 12 min photoreaction, and has a photodegradation activity which is about 3.1 times larger than that of bare AgBr particles. The underlying photodegradation mechanism of the ternary composite photocatalysts was investigated and discussed.
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ACS Applied Nano Materials
·
2019
·
IF 0
Hongxiang Zhang,Chunxia Wu,Canran Zhang,Bisheng Yan,Jiyuan Guo,Gangyi Zhu,Jun Dai
In this paper, we report the dual-wavelength green-light emission from zinc oxide (ZnO)-nanoseed-decorated p-GaN (gallium nitride)/n-ZnO nanorod/CsPbBr3 quantum dots (QDs) light-emitting diodes (LEDs). At the same time, the effect of ZnO nanoseeds on the p-GaN/n-ZnO nanorod/CsPbBr3 QDs LED performance is deeply studied. ZnO nanoseeds were fabricated by magnetron sputtering and the sol–gel method; then ZnO nanorods were obtained on GaN by hydrothermal treatment to form the p-GaN/n-ZnO nanorod heterojunction, and green CsPbBr3 QDs were further deposited on ZnO nanorod arrays to realize LEDs. The results show that magnetron-sputtering ZnO nanoseeds can induce regular vertical ZnO nanorod arrays, and the corresponding device presents a better electroluminescence (EL) performance. The X-ray diffraction, atomic force microscopy, and EL mechanisms indicate that the p-GaN/n-ZnO nanorod with magnetron-sputtering ZnO nanoseeds has a better crystalline interface. Our results indicate that the p-GaN/n-ZnO nanorod/CsPbBr3 QDs heterojunction structure can be served as dual-wavelength LEDs, and magnetron-sputtering ZnO nanoseeds can give rise to a better EL performance.
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CELLULOSE
·
2019
·Vol. 27
·期 3
·1745-1761
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IF 3.917
Wan Caiyan,Liu Mingsheng,Tian Peixiu,Zhang Guangxian,Zhang Fengxiu
Abstract A bio-based P–N synergistic flame retardant ammonium salt of d -Panthenol-tri (methylphosphonic acid) (ADPTMPA) was synthesized using a formaldehyde-free and solvent-free strategy for the highly efficient preparation of durable flame-retardant cotton. The ADPTMPA structure was verified by 1 H NMR, 13 C NMR and 31 P NMR. FT-IR test revealed successful grafting of the flame retardant onto the cotton through P–O–C covalent bonding. The morphologies and structures of pure cotton and treated cotton were characterized by SEM and XRD, and the elemental compositions of cotton samples were analyzed by EDX. Volatile pyrolysis products of treated cotton were analyzed by TG-IR. Flame retardancy and washability of treated cotton were analyzed by limiting oxygen index (LOI) and vertical flammability tests (VFT). The LOIs of 40 wt% ADPTMPA treated cotton before and after 50 laundering cycles was determined as 46.5% and 35.8%, respectively. VFT showed the treated cotton exhibited no smoldering and continuous burning. All carbon lengths of treated cottons were less than 60 mm. The heat release rate and total heat release of treated cotton were decreased by 91.34% and 58.01% compared with pure cotton, respectively. There was 29.42 wt% carbon residual remaining when the treated cotton was exposed to heat flow of 35 kw/m 2 . The treated cotton exhibited excellent flame retardancy and washability. Additionally, the mechanical properties and whiteness of the treated cotton were well-maintained. Graphic abstract
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RSC Advances
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2019
·Vol. 9
·期 70
·40873-40882
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IF 3.049
Lu Diao,Ao Shen,Yunxu Yang,Jin Tao,Ying Hu
Chemotherapeutic drug resistance poses a great challenge in cancer therapy. Drug efflux and anti-apoptotic processes are the two most common mechanisms leading to chemotherapy resistance. In this study, we focused on the applicability of curcumin (CUR) as a sensitizer for chemotherapeutics (doxorubicin [DOX] as the model drug) modified with hyaluronic acid (HA) as an effective therapeutic strategy against multidrug resistance (MDR) in cancer cells. We constructed an HA–CUR/DOX delivery system measuring approximately 180 nm with superior encapsulation efficacy and serum stabilities. In vitro, we found that HA modification could facilitate the efficient delivery of chemotherapeutics through CD44 receptor-mediated targeted delivery. MTT assay results confirmed that the combination of CUR and DOX/paclitaxel (PTX) had a significant synergistic effect and significantly reversed MDR. Further experiments including real-time polymerase chain reaction and western blotting proved that the main mechanisms by which CUR reversed MDR in tumor cells were inhibiting the expression and activity of P-glycoprotein (P-gp) and inducing apoptosis through mitochondrial pathway. Taken together, our new engineered tumor-targeting nanoparticle delivery system may have the potential for overcoming MDR in cancer.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 15
·48569
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IF 2.188
Wenying Shi,Xianhua Zeng,Hongbin Li,Haixia Zhang,Xiaohong Qin,Rong Zhou
In order to obtain the compatible poly( p -phenylene terephthalamide) (PPTA)/polyvinylidene fluoride (PVDF) blend membranes, the casting solution was synthesized via the in situ polycondensation process and flat sheet blend membranes were successfully prepared through the immersion precipitation phase inversion method in our previous study. In this study, the polycondensation solution was directly used as the spinning dope to fabricate PPTA/PVDF hollow fiber in-situ blend membrane by the dry-wet spinning technique. Hollow fiber membranes were employed to remove the dyes including Congo red (CR) and methylene blue (MB) from the dyeing liquor. Effects of operation conditions on dye rejection and membrane water flux were investigated. With the increase of operation pressure, feed concentration and feed temperature, dye rejection rates gradually decreased, but the rejection value of CR and MB still remained above 99.5%. On the contrary, the permeation water flux basically increased. During the continuous dye filtration of 300 min, hollow fiber membrane can maintain high dye rejection rates and stable water flux. The combination method of physical backwashing and chemical cleaning can effectively alleviate membrane fouling and recover membrane water flux. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48569.
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Materials Research Express
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2019
·Vol. 6
·期 11
·115507
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IF 1.449
Qiong Wu,Tiankuo Yao,Minqi Sheng,Jialun Shi,Fan Lv
The high-performance catalytic electrodes are always required in industrial water electrolysis for enhancing the efficiency of energy conversion. In this paper, we utilized a simple electroless deposition method to deposit Co-W-P on carbon cloth (CC), to construct a bifunctional Co-W-P/CC self-supported electrode for electrochemical water splitting in 1.0 M KOH. The Co-W-P on CC is amorphous and displays nodular structure. The molar ratio of Co2+/WO42− in the synthesis process makes remarkable influence on the catalytic activity of Co-W-P/CC. For optimized Co-W-P/CC-3 (Co2+/WO42− molar ratio about 6:1), an overpotential of 150 mV at −10 mA·cm−2 is required with a Tafel slope of 137.3 mV·dec−1 toward hydrogen evolution reaction (HER), and an overpotential of 350 mV at 10 mA·cm−2 is required with a Tafel slope of 113.2 mV·dec−1 toward oxygen evolution reaction (OER). Furthermore, when functioned as a bifunctional electrode for overall water splitting, the electrolyzer of Co-W-P/CC (−)//Co-W-P/CC (+) shows the cell voltage of 1.74 V at 10 mA·cm−2, as well as superior stability with negligible increase of cell voltage (0.05 V) over 20 h. The work provides an efficient and inexpensive electrode material, which can be used to replace the noble metal-based catalysts for electrochemical water splitting.
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Membranes
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2022
·Vol. 13
·期 1
·14
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IF 4.562
Jingjun Peng,Bhaskar Jyoti Deka,Shaodi Wu,Zhongyuan Luo,Jehad A. Kharraz,Wei Jia
Water pollution caused by oil spills or sewage discharges has become a serious ecological environmental issue. Despite the membrane separation technique having a promising application in wastewater purification, the membrane fabrication method and separation robustness have remained unsatisfactory until now. Herein, we developed a novel strategy, spacer-assisted sequential phase conversion, to create a patterned polyvinylidene fluoride@polypropylene (P-PVDF@PP) substrate membrane with a multiscale roughened surface. Based on that surface structure, the underwater oil resistance behavior of the P-PVDF@PP membrane was improved. Moreover, owing to the abundant active sites on the P-PVDF@PP surface, the polydopamine/P-PVDF@PP (PDA/P-PVDF@PP) Janus membrane could be readily fabricated via wet chemical modification, which exhibited excellent switchable oil–water separation performance. Regarding surfactant-stabilized oil-water emulsion, the as-prepared PDA/P-PVDF@PP Janus membrane also had robust separation efficiency (as high as 99% in the n-hexane/water, chloroform/water, and toluene/water emulsion separation cases) and desirable reusability. Finally, the underlying mechanism of emulsion separation in the PDA/P-PVDF@PP Janus membrane was specified. The as-designed PDA/P-PVDF@PP Janus membrane with high-efficiency oil–water separation shows potential application in oily wastewater treatment, and the developed fabrication method has implications for the fabrication of advanced separation membranes.Keywords:emulsion separation;Janus membrane;patterned interface;switchable wettability
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Qingxin Yang,Ying Liu,Fengniu Lu,Junqi Cheng,Siyuan Sun,Zhiqin Yuan,Chao Lu
Background The selective recognition of drugs and its metabolism or decomposition products is significant to drug development and drug resistance research. Fluorescence-based techniques provide satisfying sensitivity by target-triggered chemical reaction. However, the interference from the matrix or additives usually restricts the specific detection. It is highly desirable to explore specific chemical reactions for achieving selective perception of these species. Results We report a specific m -aminophenol (MAP)-dopamine (DA) reaction, which generates highly fluorescent azamonardine-like products. Based on this reaction, fluorometric and indirect detection of p -aminosalicylic acid (typical antituberculosis drug , PAS) can be realized using the DA-based probe with high sensitivity. The acid induces the decarboxylation of PAS and produces MAP, which reacts with DA and generates fluorescent azamonardine-like products. The practical application of the proposed method is validated by the accurate PAS analysis in urine samples and Pasinazid tablets. Interestingly, none of additives in the Pasinazid tablets contribute comparable fluorescence variation. Significance This work discovers a new MAP-DA reaction for the first time, it not only explores sensitive PAS drug detection probe, but also demonstrates the feasibility of the development of novel drug analysis platform by recognizing decomposition product with specific reaction. Thus, new avenues for the exploration of simple and rapid spectrophotometric probes toward various drug analytes with high specify and sensitivity based on this tactic might be possible in analytical and drug-related fields.
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PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Yufa Sun,Hao Xin,Yi Wu,Chen Zhang,Changjie Chen,Xiangdong Zhou
A new type of flame-retardant polyether diols containing phosphorus, nitrogen, and sulfur (SPAE) was first synthesized by using phosphoryl chloride, 2-aminobenzothiazole and ethylene glycol . The SPAE as the soft segment was then utilized to prepare a series of flame-retardant waterborne polyurethanes (SPAE-WPU) through emulsion polymerization . Subsequently, SFR-WPU as a finishing agent was coated on polyamide fabric. When the content of SPAE-WPU was 18 wt%, the coated fabric exhibited a limiting oxygen index (LOI) of 28.2 %, afterflame time of 4.6 s, afterglow time of 0 s and damaged length of 11.2 cm, respectively. After 10 washes, the coated fabric retained its good flame-retardancy and anti-dripping properties. Furthermore, the flame-retardant mechanism of SPAE-WPU was investigated using various spectral analyses, which revealed that the P, N and S elements worked together to create non-combustible gas compounds, release free radicals, and promote dehydration and carbonization , leading to synergistic flame-retardant effects in both gas- and condensed-phase.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Xiaoyan Xu,Qihong Lu,Jiawei Wu,Wei Mo,Lei Zuo,Ning Yang,Weiwei Xia,Xianghua Zeng
To improve CdS photocatalytic activity , both Cu x Cd 1- x S nanorods and Cu 2 S@CdS p-n heterostructures have been prepared with a simple solvothermal method . The results showed that the maximum H 2 generation rate is equal to 10 mmol h −1 g −1 and 12.1 mmol h −1 g −1 for samples 0.3-Cu 2 S@CdS and Cu 0.1 Cd 0.9 S, respectively, which are nearly 9 and 12 times larger than that of CdS (1.2 mmol h −1 g −1 ) without using Pt as the co-catalyst. The measurements of the light absorption revealed that the samples Cu 2 S@CdS p-n heterostructures and Cu x Cd 1- x S nanorods have an increased visible light absorption. Band structure revealed that Cu 2 S@CdS p-n composite is a type-II heterostructure, which facilitates the separation of photoexcited charge carriers . Furthermore, as the Cu-doping CdS introduced a defect level , which induced the increase of carrier density, and the defect energy level in Cu 0.1 Cd 0.9 S and the band energy in CdS form a type-II heterostructure. Due to the appropriate band structure and stronger light absorption, Cu 2 S@CdS p-n heterostructures and Cu + -doping CdS demonstrated an improved photocatalytic activity and stability.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Jianwang He,Zhijin Cheng,Zhuo Liu,Meijuan Yin,Yuchi Zhang,Le Han,Yan Xu
Although metal oxides based gas sensors have been researched extensively in previous works, there are enormous challenges on improving the deficiencies in poor selectivity, sensitivity, humidity resistance and so on. Hence, we developed an epitaxial growth method to prepare dendritic Co 3 O 4 /In 2 O 3 -(1−3) heterostructures of distinct Co/In mass ratios through perfect lattice matching between the two crystal domains at the interface, along with introducing large amounts of oxygen vacancies . As a result, the Co 3 O 4 /In 2 O 3 -2 heterostructure based gas sensor showed enhanced sensing properties towards triethylamine (TEA, 100 ppm) with a high response value of Ra/Rg = 576.1 at an optimal working temperature of 200 °C, which is 93 times higher than that of pristine In 2 O 3 . Moreover, the Co 3 O 4 /In 2 O 3 -2 sensor exhibited excellent gas selectivity, quick recovery time, repeatable cycling, long-term stability, as well as outstanding humidity resistance. The improved TEA gas sensing performance can be attributed to the integration of interfacial synergies in Co 3 O 4 /In 2 O 3 p-n heterostructure and generation of rich oxygen vacancies, exposing more active sites to facilitate the adsorption/desorption of gas molecules. This work provides a feasible pathway to regulate TEA sensing performance of metal oxide semiconductor (MOS) gas sensors by capitalizing on self-sacrificial template strategy and reconstruction of novel metal oxide heterostructure.
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