Analytical Methods
·
2020
·Vol. 12
·期 17
·2237-2243
·
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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CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Qiang Li,Hongxia Gao,Sen Liu,Juan Lv,Zhiwu Liang
The aim of this project was to develop a thermodynamic model for the vapour-liquid equilibrium of an amine-water-carbon dioxide system and to evaluate the CO 2 capture performance of aqueous EMAB solution. The structurally modified tertiary amine 4-(ethyl-methyl-amino)-2-butanol (EMAB) was chosen because of its molecular structure-activity relationship. Measurements were made of its equilibrium CO 2 solubility, viscosity, dissociation constant, and second-order reaction rate constant, and the heat of absorption was then calculated. Additionally, the novel semi empirical model (Extended C f model) and the novel rigorous thermodynamic model (fugacity-activity model) which take into consideration the association of the partial molar property and the equation of state were developed to predict the equilibrium CO 2 solubility. The models can provide reasonable prediction results with AARDs of 2.3% and 3.68%, respectively. Furthermore, the thermodynamic and dynamic properties of EMAB were analyzed and evaluated by a comprehensive method and compared with some new tertiary amines and traditional commercial amines. The study concludes that EMAB has good CO 2 capture performance and is expected to be one of the most promising alternative amines for post combustion CO 2 capture technology.
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ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2020
·Vol. 42
·期 9
·2881-2894
·
IF 3.472
Ding Na,Wang Lu,Kang Yuan,Luo Kesong,Zeng Diya,Man Yu Bon,Zhang Qiuyun,Zeng Lixuan,Luo Jiwen,Jiang Feng
The transcriptomic response of green microalga Chlorella sorokiniana exposure to environmentally relevant concentration of cadmium(II) (Cd) and 4- n -nonylphenol (4- n -NP) was compared in the present study. Cd and 4- n -NP exposure showed a similar pattern of dys-regulated pathways. The photosystem was affected due to suppression of chlorophyll biosynthesis via down-regulation of Mg-protoporphyrin IX chelatase subunit ChlD (CHLD) and divinyl chlorophyllide a 8-vinyl-reductase (DVR) in Cd group and via down-regulation of DVR in 4- n -NP group. Furthermore, the reactive oxygen species (ROS) could be induced through down-regulation of solanesyl diphosphate synthase 1 (SPS1) and homogentisate phytyltransferase (HPT) in Cd group and via down-regulation of HPT in 4- n -NP group. Additionally, Cd and 4- n -NP would both cause the dys-regulation of carbohydrate metabolism and protein synthesis. On the other hand, there are some different responses or detoxification mechanism of C. sorokiniana to 4- n -NP stress compared to Cd exposure. The increased ROS would cause the DNA damage and protein destruction in Cd exposure group. Simultaneously, the RNA transcription was dys-regulated and a series of changes in gene expressions were observed. This included lipid metabolism, protein modification, and DNA repair, which involved in response of C. sorokiniana to Cd stress or detoxification of Cd. For 4- n -NP exposure, no effect on lipid metabolism and DNA repair was observed. The nucleotide metabolism including pyrimidine metabolism and purine metabolism was significantly up-regulated in the 4- n -NP exposure group, but not in the Cd exposure group. In addition, 4- n -NP would induce the ubiquitin-mediated proteolysis and proteasomal degradation to diminish the misfolded protein caused by ROS and down-regulation of heat shocking protein 40. In sum, the Cd and 4- n -NP could cause the same toxicological effects via the common pathways and possess similar detoxification mechanism. They also showed different responses in nucleotide metabolism, lipid metabolism, and DNA repair.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xingyu Liu,Jinwei Gao,Qianming Wang
The low resistance to moisture will be the main obstacle for the perovskites used in device package and solar cell application. Most of literatures refer to the route that the quantum dots should be incorporated into a wide variety of stabilized hosts. However, the generation of protecting layers requires complicated treatments and decreases solubility or dispersity. Moreover, morphological control of perovskite nanocrystals with the assistance of covering substrate is a big challenge. Self-assembly of colloidal nanocrystals into ordered architectures has caused considerable interests and enabled new ways to manipulate the physicochemical properties for targeted applications. Herein, we describe how inorganic halide perovskites (CsPbBr 3 ) with five different shapes (cubic, dot, sheet, ring and complex-coated) are formed by adjusting the sequence of PbBr 2 , 2-mercapto-3-methyl-4-thiazoleacetic acid (MMTA) and water. Realization of long-term stability and high efficiency requires innovative designs in both internal chemical structure and external interface engineering. PbBr 2 improves the ionic nature of CsPbBr 3 due to its cation supplement strategy. MMTA plays an important role in cross-linking process and the hydrogen bond/coordination interactions can passivate the interfacial surface for optimizing the microstructure. Water is not always detrimental in producing irreversible degradation. The shape evolution from the individual particles into much extended structure leads to the formation of complex-coated- CsPbBr 3 (CC- CsPbBr 3 ). It can retain 40% of its original emission intensity in water for 36 h, whereas the typical cubic CsPbBr 3 exhibits poor performance during water tolerance experiments and has been completely quenched within 12 h. A wide color gamut system with 153% of National Television System Committee (NTSC) space is developed for CC- CsPbBr 3 .
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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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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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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 8
·2692-2700
·
IF 4.052
Hui-Tao Fan,Xue-Guo Liu,Xiao-Jing Xing,Bo Li,Kun Wang,Shu-Ting Chen,Zhou Wu,Dong-Fang Qiu
In this work, using a modified Stöber process, we synthesized ordered mesoporous silica cubic particles (OMS-C) and prepared a nanocatalyst (Ag–OMS-C) based on OMS-C with a high surface area via an in situ auto-reduction strategy. The as-prepared Ag–OMS-C nanocomposites demonstrated open mesopores (3.51 nm), a large specific surface area (540 m2 g−1) and a high pore volume (0.88 cm3 g−1). The catalytic reduction of 4-nitrophenol (4-NP) over the Ag–OMS-C nanocatalyst was almost complete within 150 s without stirring and the rate constant k (30 × 10−3 s−1) is much higher than those of other substrate-supported Ag nanocatalysts. Moreover, the Ag–OMS-C nanocomposites hold a stable catalytic efficiency over five reaction cycles. The results indicate that the Ag–OMS-C nanocatalyst exhibited high catalytic activity and good reusability toward the reduction of 4-NP, which might be attributed to the large specific surface area, the pore structure of the nanocatalyst, as well as the synergistic effect between OMS-C and AgNPs.
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Polymers
·
2019
·Vol. 11
·期 4
·598
·
IF 3.164
Xin Min,Xiaodong Fan
This work reports the preparation of a hydroxyl terminated polystyrene-b-polybutadiene-b-polystyrene triblock copolymer (SBS) with high cis-1, 4 content via a novel nickel catalyst, [η3-Ni(CH2CHCHCH2OOCH3)][BPhF4]. FT-IR,1H-NMR, and13C NMR indicated that the polybutadiene segment of the copolymer contains greater than 90% cis-1, 4 structure, indicating achievement of the objective. Toward the functionalization goal, a hydroxyl group was successfully introduced at the end of the triblock copolymer (HO–SBS–OH). The results of gel permeation chromatography (GPC) revealed that the polymer is indeed a triblock copolymer, with no traces of homopolymer. Differential scanning calorimetry (DSC) showed that HO–SBS–OH synthesized using the novel catalyst had a lower glass transition temperature (Tg) than HO–SBS–OH synthesized with an alkyl lithium catalyst. Therefore, the polymer synthesized via the novel catalyst contains high cis-1,4 content and displays excellent low-temperature mechanical properties.Keywords:hydroxyl terminated polystyrene-b-polybutadiene-b-polystyrene triblock copolymer;high cis-1,4 content;nickel catalyst
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2018
·
IF 2.831
Lan Luo,Congcong Gu,Mingxian Li,Xiangyuan Zheng,Feng Zheng
4-Nitrobenzaldehyde is the synthetic raw material and an important photodegradation product of chloramphenicol . With a structural “alert” of human genotoxic potential and reported mutagenicity, this compound should be controlled in drug substances as a potential genotoxic impurity. However, current analysis methods require complex pre-treatment processes and/or lack sufficient specificity and sensitivity. Nitrophenylhydrazine is a common carbonyl derivatization reagent used to determine the residual aromatic aldehydes in drug samples. In the present study, we report an unexpected advantage of 3-nitrophenylhydrazine hydrochloride as a derivatization reagent in the derivatization high-performance liquid chromatography-ultraviolet detection method to determine 4-nitrobenzaldehyde in chloramphenicol samples. Compared with other nitro-substituted phenylhydrazines , 3-nitrophenylhydrazine hydrochloride can minimize drug matrix and derivatization reagent interferences, since the maximum absorption wavelength of its derivative is significantly red-shifted to 397 nm. The derivatization conditions have been optimized in terms of reaction efficiency, including reaction temperature, time, and diluting solvent, through a design of experiments. As a result, after reaction with 500 μg mL −1 of 3-nitrophenylhydrazine hydrochloride in acetonitrile-water (70:30, v/v) at 60 °C for 30 min, the developed HPLC method could be used to determine 4-nitrobenzaldehyde with a limit of detection of 0.009 μg mL −1 . The method was then validated and applied for the determination of residual 4-nitrobenzaldehyde in chloramphenicol and its eye-drop samples.
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Journal of Cleaner Production
·
2018
·
IF 5.651
Hengjun Gai,Caiyun Zhong,Lin Qiao,Shuo Chen,Meng Xiao,Hongbing Song
Wastewater containing 1-amino-2-naphthol-4-sulfonic acid (ANS) is mainly derived from the dye production process, causing serious environmental problems. In this work, extraction of ANS from wastewater was carried out using trioctylamine (TOA) under condition of methyl isobutyl ketone (MIBK) as a diluent. The effects of diluent type, concentration of TOA, temperature and pH on the distribution coefficient (D) were discussed in detail. The results showed that the value of D = 76 was obtained with TOA (1.41 mol kg −1 ) + MIBK at 25 °C and pH = 1.1. After that, the extraction mechanism was determined by analyzing the chemical bonds of the complex compound using UV–vis, FT-IR and 1 H NMR. The experimental results showed that the extractant could be regenerated by back extraction. Specially the distillation process was simulated using Aspen Plus and the results verified its feasibility in the process of extractant regeneration. The proposed extraction system is conductive to both environment and technology .
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Small
·
2018
·Vol. 14
·期 33
·1801812
·
IF 9.598
Kai Gu,Xueting Pan,Weiwei Wang,Junjie Ma,Yun Sun,Hailong Yang,Heyun Shen,Zhijun Huang,Huiyu Liu
Loading novel metal nanosheets onto nanosheet support can improve their catalytic performance, but the morphological incompatibility makes it difficult to construct a well-contacted interface, which is of particular interest in supported catalysts. Herein, Pd nanosheets (Pd NSs) are supported onto graphitic carbon nitride nanosheets (CNNSs) with intimate face-to-face contact through an in situ growth method. This method overcomes the limitations of the morphological incompatibility and ensures the intimate interfacial contact between Pd NSs and CNNSs. The nitrogen-rich nature of CNNSs endows Pd NSs with abundant anchoring sites, which optimizes the electronic structure and improves the chemical and morphological stability of Pd NSs. The supported Pd NSs demonstrate high dispersion and exhibit largely enhanced activity toward the reduction of 4-nitrophenol. The concentration-normalized rate constant is up to 3052 min −1 g −1 L, which is 5.4 times higher than that obtained by unsupported Pd NSs. No obvious deactivation is observed after six runs of the recycling experiments. It is believed that the supported novel metal nanosheets with the intimately contacted interface may show promising applications in catalysis.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Pan Li,Xuehua Zhang,Chunchao Hou,Yong Chen,Tao He
Fabrication of hybrid system coupling inorganic semiconductor photosensitizer with molecular catalyst provides a promising approach to achieve highly efficient CO 2 reduction into solar fuels, as the semiconductor nanomaterials can meet the prerequisites of visible-light photoresponse and high charge-separation efficiency for achieving high photocatalytic efficiency. In this work, CdS/Bi 2 S 3 heterostructures have been prepared via an ion-exchange reaction and employed as the photosensitizer to couple with tetra(4-carboxyphenyl)porphyrin iron(III) chloride (FeTCPP) molecular catalyst for photoreduction of CO 2 into CO and H 2 under visible-light irradiation. The sulfur vacancy in CdS surface can be reduced by the formation of CdS/Bi 2 S 3 heterostructure. The content of Bi 2 S 3 can be modulated via tailoring the ion-exchange reaction time. The resulting effect on the performace of CO 2 photoreduction has been investigated in detail. Benefiting from the enhanced separation and utilization of charge carriers, CdS/Bi 2 S 3 -0.5 h/FeTCPP hybrid catalyst exhibits 8.2 times CO yield (1.93 mmol/g/h) and 1.7 times H 2 yield (6.08 mmol/g/h) of CdS/FeTCPP hybrid catalyst. More important, the results of energy level alignment, electron spin resonance and photocatalysis indicate that electron-transfer direction can be changed once the CdS/Bi 2 S 3 heterostructure is coupled with FeTCPP. In the CdS/Bi 2 S 3 heterostructure, electrons transfer mainly from the conduction band of CdS to Bi 2 S 3 , while it is mainly from the conduction band of CdS to FeTCPP in the CdS/Bi 2 S 3 /FeTCPP hybrid.
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