JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 29
·期 3
·629-640
·
IF 2.523
Li Dongdong,Hu Xuli,Zhao Hongyuan,Ding Kunjie,Li Fang,Han Shixing,Wang Hongliang,Bai Lianyang,Liu Runqiang
Carbonaceous nanomaterials have exhibited huge practical prospects as conductive sensitizers for the modification of electrodes. In this work, the nanocomposite of graphitized multi-walled carbon nanotubes@Super P Li carbon nanoparticles (GCNTs@SP-Li) was designed via a simple ultrasonication-assisted strategy, and then the GCNTs@SP-Li/GCE sensor based on the synthesized GCNTs@SP-Li nanocomposite decorating glassy carbon electrode (GCE) was successfully applied in the sensitive detection of isoproturon (ISO). For the GCNTs@SP-Li nanocomposite, GCNTs with porous structure presented excellent adsorption property, which contributed to the preconcentration of ISO and facilitated the electrolyte penetration. Additionally, GCNTs possessed good electrical conductivity owing its higher graphitization degree. More importantly, the interconnected dot-line-like structure of GCNTs@SP-Li nanocomposite acted as conductive “highways” to remarkably reduce the electron transport distance, which could significantly accelerate the process of redox reaction. Benefiting from the synergistic effect of GCNTs and SP-Li, the optimized GCNTs@SP-Li/GCE sensor showed a low detection limit of 0.1653 μM in the linear concentration of 0.7–30 μM. Additionally, the proposed sensor exhibited satisfactory recoveries from 97.2 to 101.6% towards the determination of ISO in river water and tap water. This work offers a feasible and cost-effective idea in developing the high-performance ISO electrochemical sensor.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 97
·79342-79347
·
IF 3.84
Xingrong Xiao,Hui Yang,Nuoxin Xu,Liang Hu,Qilong Zhang
Ag@TiO2 core–shell nanoparticles were synthesized as fillers using a simple vapor-thermal method. Based on the nanoparticles, the P(VDF-HFP)/Ag@TiO2 hybrid films were first prepared by embedding Ag@TiO2 nanoparticles in a poly(vinylidene fluoride co-hexafluoropropylene) [P(VDF-HFP)] matrix. Microstructural and thermal analysis confirmed that Ag nanoparticles had been successfully coated by TiO2 shells and that the thickness of the shell layer was about 8–10 nm. The Ag@TiO2 nanoparticles act as nucleation sites to promote crystallization of the polymer matrix without changing its structure. The P(VDF-HFP)/Ag@TiO2 composite exhibited enhanced dielectric properties over a wide frequency range, and the dielectric permittivity of the polymer nanocomposites is enhanced by ∼300% over the P(VDF-HFP) matrix at a low filler loading of 10 vol%. Moreover, P(VDF-HFP)/Ag@TiO2 also exhibit a higher dielectric constant than P(VDF-HFP)/Ag, P(VDF-HFP)/TiO2 and P(VDF-HFP)/Ag/TiO2 blend composites while maintaining a low loss tangent (below 0.03 at 1 kHz) to achieve a duplex polarization effect.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Mohammed Hassan Ibrahim,Zhonghua Xue,Mahgoub Ibrahim Shinger,Hassan Idris Abdu,Lulu Xiong,Duoliang Shan,Xiaoquan Lu
Immoderate intake of nitrite (NO 2 − ) is deleterious human health and may result in causing dangerous diseases. In this study, nitrite detection system was successfully fabricated based on a unique diazo-coupling reaction of p‑Aminobenzoic acid (PABA) and phloroglucinol (1, 3, 5‑trihydroxybenzene). Upon the presence of NO 2 − in an acid medium, p‑Aminobenzoic acid could not only form diazonium ion easily but also couple with p‑Aminobenzoic acid, and results forming yellow water-soluble azo dye that shows maximum absorption at 434 nm. Under the further accurate determination condition, such as acid concentration, amount of reagents and time required, the naked-eye detection of NO 2 − showed excellent selectivity in compared with some anions. Especially, diazotization and coupling reaction proposed here is very fast and control of pH and temperature are unnecessary. Moreover, the color is stable for several days and Beer's law is obeyed over a wide range. Reliable detection can be made in the range of 0.05 to 1 p.p.m. of nitrite ion. Detection limit was calculated to be 0.024 p.p.m. (0.52 μ M) by UV–visible spectroscopy and 0.05 p.p.m. (1.09 μ M) by naked-eye. By using an electrochemical method, IR, SEM, and 1 HNMR, the sensing mechanism can be easily verified. More importantly the proposed method was successfully applied for the determination of nitrite in a real water sample.
研究领域:
分析化学
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环境科学
·
生物医学
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2017
·Vol. 119
·期 12
·1700243
·
IF 2.145
Wenlu Zuo,Xuechao Hu,Yaqiong Yang,Ling Jiang,Lujing Ren,He Huang
p -Anisidine value (AV) is an important and commonly used index to determine the second oxidation statue of edible oils, but it sometimes cannot reflect the concentrations of all the secondary products, such as saturated aldehydes. An improved method for the determination of saturated aliphatic aldehydes (SAA) in docosahexaenoic acid (DHA)-rich oils is developed in this study. This method reduces the aldehyde 2,4-dinitrophenylhydrazone adducts (DNPhydrazones) using 2-picoline borane, which can eliminate the analytical error caused by the isomerism of DNPhydrazone derivatives. The changes of SAA content during the oxidation of DHA-rich oil is subsequently monitored. Acetaldehyde (168.8 µmol kg −1 ) and propionaldehyde (78.5 µmol kg −1 ) are the two main SAAs in fresh oil, and their concentrations increase to 824.8–811.9 µmol kg −1 , respectively, after oxidation for 50 h at 80 °C. Furthermore, a Michael addition reaction is found to significantly reduce the AV of oxidized oils, from 172.5 to 11.7. Moreover, the concentration of SAAs shows no significant difference and could clearly identify the low-quality oil. These results demonstrate that SAA content might be a potential index to identify oxidized oils, which could provide a good supplementary value to the traditional AV index. Practical Applications : The method that has been developed in this study makes it possible to quantify saturated aliphatic aldehydes as markers of oxidation of oils, especially when the panisidine value (AV) cannot correctly assess the levels of secondary products. It could serve as a supplement to the AV index and could be applied to oils, fats, and food products. This work provides quantitative data regarding the amounts of saturated aliphatic aldehydes that can be present in DHA-rich oils during the oxidation process. An improved method for determinig saturated aliphatic aldehydes (SAA) in docosahexaenoic acid (DHA)-rich oils is developed. The changes of SAA content during the oxidation of DHA-rich oil is monitored. Furthermore, a Michael addition reaction is found to significantly reduce the AV of oxidized oils, from 172.5 to 11.7. The concentration of SAAs does not display significant differences and can clearly identify the low-quality oil. These results demonstrate that the SAA content might be a potential index to identify oxidized oils, which could serve as a good supplement to the AV index.
研究领域:
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Yaru Liu,Wenjing Yang,Yi Li,Shuang Wang,Sihui Zhan
Ciprofloxacin (CIP) has been widely detected in aquatic ecosystems due to antibiotics abuse and its refractory, which seriously affected public health and ecological safety. Herein, we devised a photo-electro-Fenton-like (PEF-like) system for efficient removal of CIP. CuBi 2 O 4 /Bi 2 MoO 6 (CBMO) p-n heterojunction composites were successfully fabricated through hydrothermal and solvothermal methods. Significantly, CBMO composite catalysts were not only able to generate ·OH by the Cu + activation of H 2 O 2 during electro-Fenton process, the following synergistic effects in the photo-Fenton process simultaneously promoted the production of more ·OH. The internal electric field (IEF) in the p-n heterojunction was conducive to the directional transfer of photogenerated electrons, thus promoting the spatial separation of photogenerated carriers. Moreover, photogenerated electrons could directly or indirectly activate H 2 O 2 to yield more abundant ·OH, thus improving photoelectric catalytic activity . Consequently, the degradation efficiency of CIP during PEF-like system was 97.4% in 90 min and the mineralization efficiency finally reached 78.5% in 180 min. The prepared CuBi 2 O 4 /Bi 2 MoO 6 ‐40 (CBMO-40) possessed great stability and structural integrity after six consecutive cycles. Furthermore, the CBMO-40 in PEF-like system showed superior performance for the removal of diverse antibiotics, including quinolones, tetracyclines and sulfonamides, which revealed the broad applicability of CBMO-40 for the antibiotics removal in PEF-like system.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yuan-Bin Chen,Siyi Xiong
This article explores the microwave dielectric properties of (La 1-x Nd x ) 2 (Zr 0.96 Ti 0.04 ) 3 (MoO 4 ) 9 (x=0.1,0.3,0.5, and 0.7) ceramics prepared by solid-state reaction. Utilizing the Rietveld refinement technique in XRD, the sample is identified as a trigonal crystal system belonging to the R 3 ¯ c space group. SEM analysis indicates that relative density has a significant impact on the ε r and Q×f of ceramics. The Q×f values of ceramics are closely related to the FWHM of the Raman spectra. At 750℃, (La 0.5 Nd 0.5 ) 2 (Zr 0.96 Ti 0.04 ) 3 (MoO 4 ) 9 ceramic exhibited excellent dielectric properties: ε r = 10.4 (±0.08), Q×f = 149,300 (±3211) GHz, τ f = −34.8 (±0.7) ppm/℃. To gain a deeper understanding of the intrinsic mechanisms governing the microwave dielectric properties of ceramics, analysis based on the P-V-L theory reveals that the La(Nd)-O bond and Mo-O bond contribute significantly to ε r and Q×f, respectively.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Runren Jiang,Donghai Wu,Guanghua Lu,Zhenhua Yan,Jianchao Liu,Ranran Zhou,Matthew Nkoom
Herein, Fe 3 O 4 quantum dots modified BiOCl/BiVO 4 p-n heterojunction was successfully synthesized by a facile strategy. Multiple techniques were carried out to characterize the as-prepared samples. Results show that the photocatalysts possess regular crystal structure and consisted of BiOCl/BiVO 4 nanosheet structure with Fe 3 O 4 QDs on its surface. Particularly, 20% Fe 3 O 4 QDs@BiOCl/BiVO 4 p-n heterojunction shows universal outstanding photocatalytic activity for removing four different broad-spectrum antibiotics under visible light. Meanwhile, the mineralization degree and degradation pathways of antibiotic were further studied by 3D-EEMs and LC-MS/MS. The improved photocatalytic performance for degradation of broad-spectrum antibiotics mainly attributes to the effective charge carrier mobility, large specific surface areas, and strong visible light absorption. The photocatalytic reaction mechanism was also revealed by the electron spin resonance (ESR) technique and the active species trapping experiments. The photocatalyst stays stable crystal structures after four reaction cycles and it can be easily separated from the solution by an external magnetic field both demonstrate that the Fe 3 O 4 QDs@BiOCl/BiVO 4 p-n heterojunction has unlimited potential for practical usage. This work is expected to be widely applicable to the removal of broad-spectrum antibiotics.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 37
·21175-21185
·
IF 3.049
Liuyi Pan,Yulong He,Menglong Niu,Yong Dan,Wenhong Li
Ni–M/SiO2 with different binary metals M (M = Ce, Co, Sn, Fe) prepared by an incipient impregnation method was used in the hydrodeoxygenation (HDO) of low-temperature coal tar distillate, which is rich in phenolic compounds. p-Cresol, as a model compound of the distillate, was used to evaluate the activity and selectivity of BTX products on the series of reduced Ni–M/SiO2 catalysts in a fixed bed reactor. The properties of the catalysts were characterized by N2 adsorption–desorption, ICP-AES, XRD, H2-TPR, and XPS. Benzene and toluene as the direct deoxygenation (DDO) products and cyclohexane and methylcyclohexane as the hydrogenolysis (HYD) products were detected to evaluate the selectivity of the path in the deoxygenation process. In this series of catalysts, the order of reactivity was Ni–Ce > Ni–Sn > Ni–Co > Ni–Fe > monometallic Ni. Meanwhile, the addition of Ce and Co loaded in the Lewis acid sites of the catalyst affected the electron distribution of nickel atom and its atomic arrangement on the surface of the carrier. Compared to monometallic Ni, the DDO path become dominant on Ni–Ce and Ni–Co and the selectivity for BTX products increased from 58.8% to 77.4% and 71.1%, respectively. The binary metal Sn, unlike the former two metals, formed a Ni3Sn crystal form with Ni, which resulted in significant enhancement of the HYD path while obviously increasing the reactivity.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Youwen Zhang,Haoyue Tang,Qi Xiao,Yu Zhang,Xiaolan Zhao,Shitong Yang
Hydroxyapatite (HAP) has been widely used for the preconcentration and stabilization of various heavy metal pollutants in both the water and soil environment. Nonetheless, there still exists a gap between its synthesis conditions, physicochemical properties and removal performances. Under such a research background, three HAP materials were synthesized via a modified co-precipitation approach by varying initial Ca/P molar ratios (i.e., 4/3, 5/3 and 6/3) and used for capturing toxic cadmium (Cd(II)) from an aqueous solution. According to the experimental results, the three synthesized HAP samples were all the Ca-deficient type and the actual Ca/P molar ratio was in the increasing order of HAP4/3 < HAP5/3 < HAP6/3. In particular, the HAP4/3 sample exhibited higher Cd(II) removal performance due to its higher specific surface area (SSA) value and abundant Ca-deficient sites. More than 93% of Cd(II) was removed within an extremely short period of 5 min and a complete removal was achieved at a prolonged contact time of 24 h. The sorption behavior of Cd(II) was independent of ionic strength variation and scarcely influenced by various inorganic electrolyte ions, low molecular weight organic acids (LMWOAs) and competing heavy metal ions . The desorption data of Cd(II)-containing HAP phases, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses pointed to a predominant removal mechanism of lattice incorporation with a minor contribution of inner-sphere surface complexation. The experimental findings demonstrated the significant application potential of Ca-deficient HAP material for the cost-effective treatment of Cd(II)-polluted water systems.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2022
·
IF 6.556
Xiaofang Chen,Min Feng,Xiaoyi Xie,Yi Zhang,Jie Zhang,Xiupei Yang
Single-atom catalysts have attracted enormous research interest in the field of catalysis owing to their remarkable catalytic activity, excellent stability and outstanding atom utilization. Herein, a new single atom based on single Fe atoms on fluorine-doped (Fe–SAs@FNC) ultrathin carbon nanosheets was successfully synthesized by a polymer-assisted heating method. Experimental evidence showed that the resultant Fe–SAs@FNC with Fe–N 4 sites exhibits superior peroxidase-like activity, which oxidizes the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue product in the presence of hydrogen peroxide (H 2 O 2 ). Based on this, an ultrasensitive and highly selective colorimetric detection method for p -phenylenediamine (PPD) in hair dyes and PPD in hair after dyeing was established, which had a wide linear range (0.2–50 μM) and low detection limit (0.07 μM). This method shows satisfactory sensitivity and selectivity.
研究领域:
材料科学
·
分析化学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Zhen He,Yu Zhou,Yuxin Wang,Pingyi Guo,Wensen Jiang,Caizhen Yao,Xin Shu
Several Ni-W-P-TiO 2 nanocomposite coatings were developed by the sol-enhanced electroplating method. The phase and elemental compositions of coatings were determined, and the surface and cross-section morphology were characterized. The mechanical and corrosion performance were systematically tested. The results revealed the addition of 5 ml·L −1 TiO 2 sol caused a compact coating surface, while higher concentrations of TiO 2 reduced the coating thickness and led to the inferior surface microstructure. The comparison in physiochemical properties of prepared coatings confirmed the superior performance of the Ni-W-P-TiO 2 nanocomposite coating at 5 ml·L −1 TiO 2 sol addition. Under this condition, the best mechanical properties were achieved when abrasive wear was the dominating wear-resistance mechanism, and the best corrosion resistance was obtained due to its smooth and compact surface microstructure.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 33
·19169-19177
·
IF 3.119
Biao Zhou,Bo Yang,Muhammad Waqas,Ke Xiao,Caizhen Zhu,Ling Wu
Constructing a 0D/3D p–n heterojunction is a feasible strategy for accelerating photo-induced charge separation and promoting photocatalytic H2 production. In this study, a 0D/3D MoS2/g-C3N4 (0D/3D-MCN) photocatalyst with a p–n heterojunction was prepared via a facile light-assisted deposition procedure, and the 3D spongy-like g-C3N4 (3D-CN) was synthesized through simple thermolysis of NH4Cl and melamine mixture. For comparison, 2D-MoS2 nanosheets were also embedded in 3D-CN by a solution impregnation method to synthesize a 2D/3D-MCN photocatalyst. As a result, the as-prepared 0D/3D-MCN-3.5% composite containing 3.5 wt% 0D-MoS2 QDs exhibited the highest photocatalytic H2 evolution rate of 817.1 μmol h−1 g−1, which was 1.9 and 19.4 times higher than that of 2D/3D-MCN-5% (containing 5 wt% 2D-MoS2 nanosheets) and 3D-CN, respectively. The results of XPS and electrochemical tests confirmed that a p–n heterojunction was formed in the 0D/3D-MCN-3.5% composite, which could accelerate the electron and hole movement in the opposite direction and retard their recombination; however, it was not found in 2D/3D-MCN-5%. This study revealed the relationship among the morphologies of MoS2 using g-C3N4 as a substrate, the formation of a p–n heterojunction, and the H2 evolution activity; and provided further insights into fabricating a 3D g-C3N4-based photocatalyst with a p–n heterojunction for photocatalytic H2 evolution.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）