Analytical Methods
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2020
·Vol. 12
·期 17
·2237-2243
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IF 2.596
Yujiao Tu,Suping Wang,Xiaotian Yuan,Pengfei Song,Yunlin Wei,Kunhao Qin,Qi Zhang,Xiuling Ji
Novel fluorescent nitrogen and phosphorus-doped carbon dots (Aa N,P-CDs) derived from Auricularia auricula were successfully prepared via a simple hydrothermal method. The Aa N,P-CDs showed high selectivity and sensitivity in detection of 4-nitrophenol (4-NP) and Ag(I) and good linear ranges of 4-NP (0–37.5 μM, R2 = 0.9967) and Ag(I) (0–25 μM, R2 = 0.9934). The low detection limits were 198 nM and 74.35 nM, respectively. This showed that static quenching dominated in Ag(I) quenching of the Aa N,P-CD fluorescence, while that of 4-NP was the inner filter effect. The Aa N,P-CDs were successfully used to detect 4-NP and Ag(I) in real water and soil samples. Cell imaging indicated that Aa N,P-CDs showed low biotoxicity and good biocompatibility, which provided a new insight into bioimaging application and environmental pollutant detection.
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SOLID STATE SCIENCES
·
2020
·
IF 2.434
Xiaofang Li,Yuandong Wu,Dajiang Mei,Hagen Poddig,Thomas Doert
Three hexasodium transition metal sulfates, Na 6 M (SO 4 ) 4 ·2H 2 O ( M = Fe, Co, Ni) were obtained by a dissolution and precipitation route and by hydrothermal reactions . The compounds were characterized by single crystal X-ray diffractions, UV/vis and IR spectroscopy , thermal analyses, and magnetization measurements. The title compounds all crystallize in the triclinic space group P 1 ‾ (No. 2) with Z = 1 and lattice parameters : a = 6.0679(8), b = 6.8658(8), c = 10.1508(12) Å, β = 92.557(4)° for Na 6 Fe(SO 4 ) 4 ·2H 2 O; a = 6.0595(5), b = 6.8446(6), c = 10.1149(8), β = 92.548(2)° for Na 6 Co(SO 4 ) 4 ·2H 2 O; a = 6.0490(4), b = 6.8265(5), c = 10.0793(7), β = 92.5470(10)° for Na 6 Ni(SO 4 ) 4 ·2H 2 O, respectively. [M(SO 4 ) 4 ] 6- anions are interconnected by hydrogen bonds to form two-dimensional layers in these structures. The solid-state UV/vis/NIR diffuse reflectance spectroscopy indicates that Na 6 M (SO 4 ) 4 ·2H 2 O ( M = Co, Ni) are insulators. Magnetization experiments show a nearly linear temperature dependence of the inverse susceptibility down to 2 K, which indicates a paramagnetic behavior for all three compounds.
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Journal of Material Cycles and Waste Management
·
2020
·Vol. 22
·期 5
·1648-1661
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IF 1.974
Qian Yi,Han Haoyue,Li Long,Qiao Peng,Chang Guozhang
Red mud-based layered double hydroxides (LRM) was synthesized by a co-precipitation route, and then a hybrid with bis(4-nitrophenyl) phosphate (BNPP)-modified LRM material (BRL) was prepared in this paper. Through X-ray diffraction(XRD), Fourier transform infrared spectra (FTIR), nuclear magnetic resonance spectra (NMR), transmission electron microscope (TEM) and energy dispersive spectrometer (EDS) analysis, the results show that BRL is better dispersed than LRM. Then, thermoplastics polyurethanes (TPU) was used as the base material. TPU/LRM and TPU/BRL composites were prepared by a melt-blending method. Cone calorimeter test (CCT) was used to investigate the effect on flame retardancy and smoke suppression. Specifically, the PHRR values of TPU/LRM and TPU/BRL composites were reduced by 41.6% and 52.5% compared with pure TPU sample. The main factor of improved flame retardancy and smoke suppression can be explained by the catalytic carbonization of LRM or BRL in solid phase and the P-radicals (such as PO · and HPO · ) in gas phase which demonstrated by thermo-gravimetric analyzer test (TGA) and char analysis.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2020
·
IF 4.192
Yu Wang,Xiaoxiao Li,Hangyan Ji,Danni Zheng,Zhengyu Jin,Yuxiang Bai,Birte Svensson
Gelation of starch is a process during short-term retrogradation. However, long-term retrogradation always leads to the quality deterioration of starch-based food. In this work, a new type of modified tapioca starch (MTS) gel with maintained short-term gelation strength and retarded long-term retrogradation was prepared using a novel recombinantly produced and characterized 4-α-glucanotransferase (TuαGT). In the resulting MTS, the exterior chains of the amylopectin part were elongated and the content of amylose was reduced because of the disproportionation activity of TuαGT. The retrogradation analysis demonstrated that the MTS possessed highly weakened long-term retrogradation characteristics as compared to the native starch. Most importantly, the strength of the gel formed by regelatinized MTS is very close to that of gelatinized native tapioca starch when storing below 30 °C. These findings provide a starting point for developing a novel method for the enzymatic modification of the starch-based gels.
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CELLULOSE
·
2019
·Vol. 27
·期 3
·1649-1659
·
IF 3.917
Zhou Zidan,Zhong Linxin,Zhang Lei,Ma Jiliang,Peng Xinwen,Sun Runcang
Hydroxyl-rich waste fibers have been utilized as support to synthesize paper derived monodispersed Ag composites. We utilized the one-step thermal reduction and carbonization method to synthesize a meso-pore carbon frame with mono-dispersed silver nanoparticles (Ag@C). The Ag@C showed excellent catalytic activity in 4-nitrophenol reduction reactions attributing to their well dispersed silver nanoparticles and high surface area. The Ag@C catalyst could be recycled for ten times without significant loss of its catalytic activity. Furthermore, the Ag@C could be used as a Surface-enhanced Raman scattering (SERS) substrate, and the SERS signals strength were shown to be seven times higher than unloaded carbon membrane. The results clearly indicated that the Ag nanoparticle-loaded recycled fibers exhibited SERS activity, rendering it an excellent SERS substrate for practical applications. The efficient utilization of the widely accessible waste fibers from paper-making industry could provide a sustainable feature of this work to reduce manufacturing cost and contribute it to be an environment-friendly bifunctional material.
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ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Sheng Chen,Jiayi Fan,Mengya Lv,Chenfeng Hua,Gaolin Liang,Shusheng Zhang
Hydrogen sulfide (H2S), as the third endogenous gasotransmitter, is closely associated with various physiological and pathological processes, whereas many aspects of its functions remain unclear. Effective tools for the accurate detection of H2S in living organisms are urgently needed. We herein reported an internal standard assisted surface-enhanced Raman scattering (SERS) nanoprobe for ratiometric detection of H2S in vitro and in living cells based on the reduction of nitros with H2S. This nanoprobe consists of an internal standard (4-mercaptobenzonitrile, MPBN) embedded core-molecule-shell Au nanoflower (Au@MPBN@Au) as the high plasmonic active SERS substrate and the 4-nitrothiophenol (4-NTP) molecule immobilized on the surface as the H2S recognition unit. With the addition of H2S, the nitros peak (1329 cm–1) decreased. Meanwhile, three obvious new peaks appeared at 1139, 1387, and 1433 cm–1, which were related to the vibration of the dimerized product 4,4′-dimercaptoazobisbenzene (DMAB) of 4-aminothiophenol (4-ATP). However, the peak intensity at 2223 cm–1 derived from MPBN was not influenced by the outer environment. Thus, the H2S level was able to be determined based on the ratio of two peak intensities (I1139/I2223) with a detection limit as low as 0.24 μM. Notably, we have proved that SERS nanoprobe Au@MPBN@Au@4-NTP could ratiometrically image both the endogenous and exogenous H2S in living cells. We anticipate that Au@MPBN@Au@4-NTP could be applied for the study of H2S-related physiological function in the future.
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Bioengineering & Translational Medicine
·
2022
·Vol. 8
·期 2
·e10414
·
IF 10.684
Peng Luo,Jiarui Fang,Dazhi Yang,Lan Yu,Houqing Chen,Changging Jiang,Rui Guo,Tao Zhu,Shuo Tang
Bone injury caused changes to surrounding tissues, leading to a large number of osteoclasts appeared to clear the damaged bone tissue before bone regeneration. However, overactive osteoclasts will inhibit bone formation. In this study, we prepared methacrylylated gelatin (GelMA)-based hydrogel to co-crosslink with OP3-4 peptide, a receptor activator of NF-κB ligand (RANKL) binding agent, to achieve the slow release of OP3-4 peptide to inhibit the activation of osteoclasts, thus preventing the long-term existence of osteoclasts from affecting bone regeneration, and promoting osteogenic differentiation. Moreover, CXCL9 secreted by osteoblasts will bind to endogenous VEGF and inhibit vascularization, finally hinder bone formation. Thus, anti-CXCL9 antibodies (A-CXCL9) were also loaded in the hydrogel to neutralize excess CXCL9. The hydrogel slow released of OP3-4 cyclic peptide and A-CXCL9 to simultaneously inhibiting osteoclast activation and promoting vascularization, thereby accelerating the healing of femur defect. Further analysis of osteogenic protein expression and signal pathways showed that the hydrogel may be through activating the AKT-RUNX2-ALP pathway and ultimately promote osteogenic differentiation. This dual-acting hydrogel can effectively prevent nonunion caused by low vascularization and provide long-term support for the treatment of bone injury.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
·
IF 5.876
Hongfei Wang,Qiaobo Liao,Kai Xi
Melamine-based covalent organic frameworks are of great concern due to the low cost of melamine but difficult to synthesize in traditional solvothermal methods without the help of structural isomerization , meanwhile having limited application domains because of strong hydrophobicity . Herein, we present a robust synthesis of melamine-based crystalline porous polymer MBCPP and its nano silver-doped composites with one-pot strategy for catalytic reduction of 4-nitrophenol. With silver nanoparticles doping, the porous structure of organic frameworks becomes more regular, and the catalysts present different phase separation and specific catalytic characteristics for equivalent reduction of 4-nitrophenol, revealing the catalytic mechanism of electron transfer explained by slow diffusion inside the catalysts. Moreover, this work displays a creative metal doping strategy for the combination of metal and COFs.
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Journal of Physical Chemistry C
·
2016
·
IF 4.509
Guangfu Liao,Jun Chen,Weiguo Zeng,Chunhan Yu,Changfeng Yi,Zushun Xu
A simple, mild and green route is developed for the preparation of uniform polystyrene-methyl acrylic acid/silver (PSMAA/Ag) nanocomposite spheres with high catalytic activities. In this approach, monodisperse polystyrene-methyl acrylic acid (PSMAA) spheres are used as polymeric matrixes; silver precursor-[Ag(NH3)2]+ ions are then adsorbed onto the surfaces of PSMAA spheres due to the strong electrostatic attraction between carboxyl groups (electronegative) and [Ag(NH3)2]+ ions (electropositive). Meanwhile, [Ag(NH3)2]+ ions are reduced to Ag nanoparticles and simultaneously protected by PVP on the surface of PSMAA spheres. In this way, the PSMAA/Ag nanocomposite spheres with loading Ag nanoparticles on PSMAA spheres are prepared in aqueous media without any toxic reagents used during the preparation process. Ag nanoparticles uniformly distribute on the surfaces of PSMAA spheres with its size ranging from 8 to 24 nm. Moreover, the coverage degree of Ag nanoparticles on PSMAA spheres increases with the increasing of concentration of silver precursor-[Ag(NH3)2]+ ions. In addition, thermal analysis results show that the prepared PSMAA/Ag nanocomposite spheres exhibit improved thermal stabilities and glass translation temperature when compared to the related neat PSMAA spheres. Catalytic studies indicate that the prepared PSMAA/Ag nanocomposite spheres exhibit high catalytic activities and good recyclability for the reduction of 4-nitrophenol, rendering a potential use in the fields of catalytic reduction of 4-nitrophenol to 4-aminophenol.
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INDUSTRIAL CROPS AND PRODUCTS
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2022
·
IF 6.449
Run-Ze Hu,Xiao-Qi Zhang,Xiao-Hui Yao,Jia-Xin Yang,En-Jiang Liu,Tao Chen,Yu-Jie Fu,Wei-Guo Zhao,Dong-Yang Zhang
To remove the pollutants nitrophenol in wastewater, a bio-inspired dynamic filter (CE-Pd-EPI) with in-situ synthesized palladium nanoparticles (PdNPs) was prepared via chemical cross-linking and freeze casting. This bio-inspired filter has a hierarchical dual-porous structure with micron-scale unidirectional channels and nanoscale pores. This hierarchical porous structure facilitates rapid mass transfer of the liquid. Therefore, this filter can completely reduce 4-nitrophenol (4-NP, 2 mM) in 3 min. The rate constant ( k ) and turnover frequency (TOF) are 2.42 min −1 and 13.17 min −1 , respectively, which are better than most reports so far. Moreover, this filter can also instantaneously catalyze the reduction of methylene blue (MB) to colorless. After five cycles, the conversion of 4-NP and MB by the filter still reaches 99.9%, demonstrating its excellent catalytic stability and reusability. In addition, in a continuous fluid catalytic system this filter has a low pressure (only 0.84 kPa) due to its bio-inspired unidirectional channel structure, which is extremely important for continuous industrial application. This bio-inspired dynamic filter has a guiding significance for the removal of organic pollutants in wastewater in industrial applications. Therefore, the bio-inspired dynamic filter described in this study has a great potential in the field of water treatment and environmental protection.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Junjie Cheng,Xinman Tu,Xinding Lv,Li Zhang,Xinjie Yang,Honghu Zeng,Jianping Zou
Current density modulates PMS activation pathways in the electrocatalytic membrane. • Sequential 1 O 2 , ETP, and radical oxidation achieves stepwise 4-CP degradation. • Polymerization-induced membrane fouling is suppressed during degradation. • Complete dechlorination and mineralization of 4-CP are simultaneously achieved. During peroxymonosulfate (PMS)-based advanced oxidation processes, uncontrolled generation of reactive oxygen species (ROS) causes phenolic substances to undergo polymerization reactions, which irreversibly block active sites and foul membrane catalytic systems. To address this, we develop a current-modulated pathway-switching strategy using a nitrogen-doped carbon quantum dots/g-C 3 N 4 nanosheet (NCQDs@CNNS) electrocatalytic membrane for complete dechlorination and mineralization of 4-chlorophenol (4-CP). By simply varying the applied current density (2, 0, and 8 mA cm −2 ), the peroxymonosulfate (PMS) activation pathway can be switched sequentially among singlet oxygen ( 1 O 2 ), direct electron transfer process (ETP), and free radicals (•OH and •SO 4 − ). Guided by theoretical calculations, the oxidation pathways are precisely tailored to the electronic structure of 4-CP and its intermediates, leading to a three-stage sequential degradation process: i) 1 O 2 first cleaves the aromatic ring without generating polymerizable phenoxy radicals; ii) ETP-triggered nucleophilic substitution then selectively dechlorinates the ring-opened intermediate; and iii) free radicals finally mineralize the residual chlorine-free aliphatic acids. This strategy completely avoids membrane fouling caused by polymerization reactions and can achieve a TOC removal efficiency of 99.3% and a dechlorination efficiency of 98.5% within 30 min, with an electrical energy per order (EEO) of 0.0026 kWh m −3 log −1 . This system maintains stable performance over five consecutive experimental cycles, and adapts well to various pH values, coexisting ions, natural organic substances, and actual water body substrates. This work provides a mechanistic strategy for the selective electrochemical regulation of oxidation pathways, which can simultaneously prevent fouling and thoroughly detoxify chlorophenolic wastewater. Download: Download high-res image (191KB) Download: Download full-size image
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JOURNAL OF MEDICINAL CHEMISTRY
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2020
·
IF 6.205
Weikai Guo,Yajing Xing,Qiansen Zhang,Jiuqing Xie,Dongxia Huang,Haijun Gu,Peng He,Miaoran Zhou,Shifen Xu,Xiufeng Pang,Mingyao Liu,Zhengfang Yi,Yihua Chen
The transcriptional repressor B-cell lymphoma 6 (BCL6) is frequently misregulated in diffuse large B-cell lymphoma (DLBCL) and has emerged as an attractive drug target for the treatments of lymphoma. In this article, a series of N-phenyl-4-pyrimidinamine derivatives were designed and synthesized as potent BCL6 inhibitors by optimizing hit compound N4-(3-chloro-4-methoxyphenyl)-N2-isobutyl-5-fluoro-2,4-pyrimidinediamine on the basis of the structure–activity relationship. Among them, compound 14j displayed the most potent activities, which significantly blocked the interaction of BCL6 with its corepressors, reactivated BCL6 target genes in a dose-dependent manner, and had better effects compared with the two positive controls. Further studies indicated that a low dose of 14j could effectively inhibit germinal center formation. More importantly, 14j not only showed potent inhibition of DLBCL cell proliferation in vitro but also strongly suppressed the growth of DLBCL in vivo.
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