Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Hanling Jiang,Yuting Chen,Aijuan Zhou,Xiaobo Gong,Juanying Yang,Jingwen Wang,Yong Liu
The selective oxidation of ammonia nitrogen (NH 4 + -N) to dinitrogen (N 2 ) by persulfates (PS)-based advanced oxidation processes (SR-AOPs) without the input of light or electrons is desired, but presents enormous challenges. In this study, S-doped carbon nanotubes (SCNTs) were prepared via a high-temperature sintering process and used to activate PS for NH 4 + -N oxidation in the presence of magnesium oxide (MgO). Compared with pristine carbon nanotubes (CNTs), SCNTs improved the N 2 selectivity of NH 4 + -N oxidation by SR-AOPs, which was attributed to the lower impedance of SCNTs than that of CNTs, enhancing the direct electron transfer pathway of NH 4 + -N oxidation. In the SCNTs/PS/MgO process, the non-radical pathway dominated the oxidation of NH 4 + -N. When SCNTs/PS/MgO process treated polluted lake water, 84.0% of NH 4 -N removal and 85.8% selectivity towards N 2 were achieved at initial pH of 6, initial NH 4 + -N concentration of 30 mg N/L, SCNTs dosage of 8 g/L, the mass ratios of SCNTs to PS of 1: 1, and reaction time of 60 min, highlighting its potential for practical applications.
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高影响因子
THERMOCHIMICA ACTA
·
2025
·
IF 3.5
Jiajun Guo,Wentao Ji,Yabei Xu,Zhitao Chen,Yang Su,Yan Wang
This paper takes the typical thermally unstable azo compound AIBN as the research object. For the key free radicals in its explosive chain reaction, two inhibitors and two target inhibitory additives were selected. Through a 20-liter spherical test device and gas-phase product analysis, the inhibitory effect of the target inhibitory additives on the explosive chain reaction was derived. The inhibition mechanism was expounded from both physical and chemical inhibition aspects through ARC experiments.The experimental results show that AIBN has very high risk of explosion and severity,. However, the compounding of DW with FAS and KI can effectively inhibit the explosion pressure and achieve complete explosion suppression, while also inhibiting the generation of toxic gases. The ARC studies discovered that FAS and KI can increase the adiabatic temperature of the thermal decomposition process of AIBN and significantly reduce the apparent activation energy of the reaction to achieve the effect of inertia.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Min Ma,Li Chen,Lin Peng,Ying Peng,Jian Bi,Daojiang Gao,Jiangtao Wu
Even if the application of semiconducting metal oxide-based gas sensors has flourished over decades, the basic understanding of how sensing characteristics are regulated remains elusive. In particular, the role of oxygen vacancy in sensing properties of p-type semiconductors has not been well investigated thus far. In this work, pristine and aliovalent ion-doped p-type multiferroic BiFeO 3 sensors were prepared by a sol-gel method, and the effect of doping on the carrier type, oxygen vacancy concentration, and gas sensing properties was studied. The gas response of BiFeO 3 increased 48 % upon 1 % Ca doping and decreased 50 % when 1 % Ti was doped in. This is because Ca-doped BiFeO 3 increases the concentration of carriers (hole) and oxygen vacancies, while Ti-doped BiFeO 3 does the opposite. In addition, the conduction characteristics of BiFeO 3 were transformed from p-type to n-type upon further substitution of Fe 3+ by Ti 4+ . This work proves that aliovalent ion doping can regulate the concentration and type of carriers in materials, as well as the control of gas sensing properties, thus shedding a light on the design of high-performance p-type semiconductors.
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高影响因子
JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·Vol. 75
·期 8
·1046-1053
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IF 0.84
Jing Wang,Liu Shao Min,Long Jun,Lei De An,Gao Feng
Abstract In this paper, we evaluated the use of a silylation reagent N-methyl-N-( tert -butyldimethylsilyl)trifluoroacetamide in the microwave-assisted derivatization method to replace a traditional prolonged heating method for the determination of 12 amino acids. Several parameters, including the kind of extraction solvent, extraction time, microwave power and microwave time, were optimized. The experiment showed that the optimal derivatization time was 3 min with a microwave power of 240 W. The calibration curves were linear with the correlation coefficients ranging from 0.995 to 1.000 in the concentration levels between 0.1–20 μg/mL and the relative standard deviations were between 4.4 and 18%. The limits of detection were 0.1–2.4 μg/mL and the recoveries of those compounds were 62–115%. A comparison of this method to other methods has demonstrated that the proposed method is a rapid and reliable sample-treatment procedure for amino acids determination in real tobacco samples.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Pengwu Xu,Weijun Yang,Deyu Niu,Manman Yu,Mingliang Du,Weifu Dong,Mingqing Chen,Pieter Jan Lemstra,Piming Ma
Bio-based and biocompatible materials such as polyhydroxyalkanoates (PHA) suffer from severe bacterial infection, poor oxygen barrier, low strength and poor heat resistance that restrict their wide applications especially in packaging areas. In this work, high-performance PHA nanocomposites with antibacterial properties are successfully obtained by compounding PHA with tailor-made long alkyl chain quaternary salt (LAQ) functionalized graphene oxide (GO -g- LAQ). The GO -g- LAQ could disperse in the PHA matrix uniformly and improve the interfacial adhesion between GO and PHA due to the hydrophobic nature of LAQ. As a result, PHA/GO -g- LAQ nanocomposites have the antibacterial rate of 99.9% against Gram-negative and Gram-positive bacteria without any leaching. The oxygen barrier is improved which is suggested by a significantly reduced oxygen permeation. This could be due to the condensed crystal structure of PHA and the impermeable property of GO sheets. The tensile strength and storage modulus at room temperature of the PHA films increased by 60% and 140%, respectively at an optimized concentration of GO-g-LAQ. The heat resistant performance of the PHA nanocomposites was simultaneously improved significantly due to the enhanced crystallization capability. Therefore, the well-designed PHA/GO -g- LAQ nanocomposites could be ideal candidates of functional materials for (food-) packaging applications.
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高影响因子
Biomaterials Science
·
2021
·Vol. 9
·期 17
·5824-5840
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IF 6.843
Mengchao Ding,Kai Shao,Lijuan Wu,Yuping Jiang,Bing Cheng,Lili Wang,Jinsheng Shi,Xiaoying Kong
Nitric oxide (NO) gas treatment offers a promising strategy for tumor therapy; however, its practical application is still limited due to its poor efficacy and biotoxicity which were caused by gas leakage during blood delivery. Herein, a nano-platform (CMH-OBN) composed of chlorin e6-melanin-hyaluronic acid nanoparticles (Ce6-MNP-HA, CMH) and oxidized bletilla striata polysaccharide microcapsules (Oxi-BSP) carrying NO donors was prepared for responsive and cascaded release of NO, reactive oxygen species (ROS) and its secondary metabolite reactive nitrogen species (RNS) in tumor sites. Melanin not only endowed CMH with good photothermal properties, but also helped Ce6 to produce a large number of ROS under near-infrared (NIR) irradiation. OBN microcapsules, which were sensitive to ROS, can release NO donors under the stimulation of ROS released by CMH nanoparticles under NIR irradiation and can further release NO in the tumor microenvironment (TME) with high expression of glutathione (GSH). NO could further up-regulate soluble guanylate cyclase-cyclic guanosine monophosphate (sGC-cGMP) signal pathways to relieve hypoxia, thus further enhancing the photodynamic therapy (PDT). Moreover, the cascaded release of ROS and NO could produce RNS with higher lethality, which could sequentially initiate the cellular apoptotic procedure and promote immunotherapy by activating T cells at the tumor sites. More interestingly, the CMH-OBN nano-platform could supply magnetic resonance imaging (MRI) and infrared photothermal imaging guidance for tumor therapy. In conclusion, the development of a CMH-OBN nano-platform provides a satisfactory demonstration by combining NO therapy with photothermal therapy (PTT), PDT and immunotherapy for the treatment of cancer.
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PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 4
·1517
·
IF 3.4
Deqi Zhang,Shenghui Guo,Jiyun Gao,Li Yang,Ye Zhu,Yanjia Ma,Ming Hou
In this paper, with the help of the method of composite materials science, parallel synthesis and high-throughput screening were used to prepare gas sensors with different molar ratios of rare earths and precious metals modified In2O3, which could be used to monitor and warn the early leakage of gasoline and diesel. Through high-throughput screening, it is found that the effect of rare earth metal modification on gas sensitivity improvement is better than other metals, especially 0.5 mol% Gd modified In2O3(Gd0.5In) gas sensor has a high response to 100 ppm gasoline (Ra/Rg= 6.1) and diesel (Ra/Rg= 5) volatiles at 250 °C. Compared with the existing literature, the sensor has low detection concentration and suitable stability. This is mainly due to the alteration of surface chemisorption oxygen caused by the catalysis and modification of rare earth itself.Keywords:high-throughput screening;surface modification;In2O3;gas sensor;fuel volatiles
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xin Dong,Xiaoli Cheng,Xianfa Zhang,Lili Sui,Yingming Xu,Shan Gao,Hui Zhao,Lihua Huo
The coral-shaped Dy 2 O 3 was prepared by a simple and environmentally friendly hydrothermal reaction combined with subsequent calcination. The coral-shaped Dy 2 O 3 was assembled by clusters, which were constructed by nanoparticles, whose sizes are 12.3 ± 3.6 nm. The gas sensors were investigated with nine gases at room temperature, and show a high response and selectivity to NH 3 . Compared with other reported metal oxide-based sensors, Dy 2 O 3 sensor exhibits not only high sensitivity, good selectivity and reproducibility to NH 3 at room temperature, but also two good linear relationships when the concentration of NH 3 is in the range of 0.1–1 ppm and 1–100 ppm. The good gas sensing property is mainly because of the 3D hierarchical structure of coral-like Dy 2 O 3 , which has a large specific surface area. This benefits NH 3 molecules to adsorb/desorb onto/from the surface as well as the electron transfer. In addition, the possible NH 3 -sensing mechanism is discussed in detail.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Zhuoqi Li,Peng Song,Zhongxi Yang,Qi Wang
In situ diffusion growth of CoMoO 4 nanoparticles on the surface of MoO 3 nanobelts was achieved through a facile method. The microstructures, morphologies, and chemical composition of the nanocomposites were investigated based on X-ray diffraction, field-emission electron scanning microscopy, transmission electron microscopy , energy dispersive spectroscopy, and X-ray photoelectron spectra. The characterization results confirmed CoMoO 4 nanoparticles uniformly distributed on the surface of the MoO 3 nanobelts. The trimethylamine sensing properties of pristine MoO 3 and CoMoO 4 /MoO 3 nanocomposites were investigated using a static system. The experimental results revealed that heterojunction structure of CoMoO 4 /MoO 3 nanocomposites displayed low working temperature and enhanced sensing performance. The response of CoMoO 4 /MoO 3 nanocomposites to 100 ppm trimethylamine was ∼104.8 at 220 °C, which was four times higher than that of pure MoO 3 at 280 °C. The reason for the enhanced sensing properties of CoMoO 4 /MoO 3 nanocomposites is attributed mainly to the formation of the p–n junction between the p-type CoMoO 4 nanoparticles and the n-type MoO 3 nanobelts.
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DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2017
·Vol. 218
·期 22
·1700275
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IF 2.5
Jiawei Xu,Chong Zhang,Zexiong Qiu,Zhenyu Lei,Bing Chen,Jia-Xing Jiang,Feng Wang
Two kinds of novel triphenylphosphine-containing microporous organic polymers are designed and synthesized via palladium-catalyzed Sonogashira−Hagihara coupling condensation reaction of triphenylphosphine oxide- and sulfide-based monomers with different arylethynylene linkers. The gas adsorption isotherms reveal that these polymers have strong binding affinity for CO 2 with high CO 2 adsorption capacity, although they have moderate Brunauer−Emmett−Teller surface area ranging from 684 to 883 m 2 g −1 . Among the resulting polymers, triphenylphosphine oxide–tris(4-ethynylphenyl)amine exhibits the highest CO 2 uptake capacity of 2.61 mmol g −1 at 273 K and 1.13 bar with relatively high gas selectivity of 60.2 for CO 2 over N 2 at 273 K.
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高影响因子
Polymers
·
2020
·Vol. 12
·期 3
·719
·
IF 3.426
Zhiqiang Tan,Huimin Su,Yiwen Guo,Huan Liu,Bo Liao,Abid Muhammad Amin,Qingquan Liu
Conjugated microporous polymers (CMPs) have conjugated skeleton and permanent porosity, and exhibit huge potential in developing novel functional materials for resolving the challenging energy and environment issues. Metal-containing CMPs often exhibited unique properties. In the present manuscript, ferrocene-based conjugated microporous polymers (FcCMPs) were designed and synthesized with 1,1′-dibromoferrocene and 5,10,15,20-Tetrakis(4- bromophenyl) porphyrin (FcCMP-1) or Tetra (p-bromophenyl) methane (FcCMP-2) as building units via Yamamoto coupling. FcCMPs were amorphous, and exhibited excellent thermal and physicochemical stability. The BET surface area of FcCMP-1 and FcCMP-2 was 638 m2/g and 422 m2/g, respectively. In comparison with FcCMP-2, FcCMP-1 displayed better gas storage capacity due to higher porosity. FcCMPs were also used as an adsorbent for removal of methyl violet from aqueous solution, and exhibited excellent adsorption properties due to the interaction between electron-rich conjugated structure of the polymers and methyl violet with cationic groups. Moreover, FcCMPs could be extracted and regenerated by an eluent and then re-used for high efficient removal of methyl violet.Keywords:conjugated microporous polymers (CMPs);ferrocene;gas adsorption;dye removal
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PubMed
高影响因子
Gels
·
2022
·Vol. 8
·期 9
·556
·
IF 4.432
Xiao-Xiao Guo,Shi-Chang Hou,Hui-Juan Li,Jun Chen,Abdul Haleem,Wei-Dong He
The macro-porous structure of polymer cryogels provides an appropriate channel for the adsorption and transport of substances, endowing its application in the field of electrochemical sensing. The combination mode of a polymer matrix and electro-active substance, particularly the distribution of an electro-active substance in the matrix, has an important effect on the overall performance of the sensor. In this work, through the simultaneous oxidation coupling polymerization of aniline (ANI) and radical polymerization of acrylamide (AAm) under cryogenic condition, conductive composite cryogels were prepared, aiming for the uniform distribution of PANI in the PAAm matrix. The possibility of simultaneous polymerizations was symmetrically investigated, and the obtained PANI/PAAm cryogels were characterized. Due to the acid-doping of PANI, the electrical conductivity of PANI/PAAm cryogels could be modulated with acidic and basic gases. Thus, the performance of the gas sensor was studied by making conductive PANI/PAAm cryogel sheets as resistive sensor electrodes. We found that the content of PANI, the sheet thickness and the dry/wet state of the cryogel influenced the response sensitivity and rate as well as the recovery properties. The response duration for HCl and NH3gas was shorter than 70 and 120 s, respectively. The cyclic detection of HCl gas and the alternate detection of NH3/HCl were achieved. This gas sensor with advantages, including simple preparation, low cost and high sensitivity, would have great potential for the application to monitor the leakage of acidic and basic gases.Keywords:cryogels;electric conductivity;gas detection;polyaniline;polyacrylamide;simultaneous polymerization
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高影响因子
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