JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Runqing Liu,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
Four new Bi(III) phosphates, K 6 Bi 13 (PO 4 ) 15 , K 5 Bi(P 2 O 7 ) 2 , and A 5 Bi 5 (PO 4 ) 4 (P 2 O 7 ) 2 (A= K, Rb) with the different condensed P-O groups have been successfully synthesized via the solid-state reactions. The single crystals X-ray diffractions show that they crystallize in the different space groups (K 6 Bi 13 (PO 4 ) 15 : C 2; K 5 Bi(P 2 O 7 ) 2 : P 1 ¯ ; K 5 Bi 5 (PO 4 ) 4 (P 2 O 7 ) 2 and Rb 5 Bi 5 (PO 4 ) 4 (P 2 O 7 ) 2 : P 2 1 / c ). The structure of K 6 Bi 13 (PO 4 ) 15 can be described as a three-dimensional (3D) network composed of the Bi-O polyhedra and PO 4 tetrahedra with K atoms filling in the space to balance the residual charges. K 5 Bi(P 2 O 7 ) 2 features 2D [BiP 4 O 14 ] ∞ layers built by the BiO 6 octahedra and P 2 O 7 dimers and the adjacent [BiP 4 O 14 ] ∞ layers are bridged by the K atoms. A 5 Bi 5 (PO 4 ) 4 (P 2 O 7 ) 2 (A = K, Rb) contain two different condensed P-O groups, PO 4 tetrahedra and P 2 O 7 dimers, which are connected by Bi-O polyhedra to construct the complicated 3D framework with K/Rb atoms located in the tunnels. Note that, the compounds that simultaneously contain two different types of P-O groups are still rare in phosphates. Detailed structural comparisons of Bi 3+ -containing phosphates indicate that the Bi/P ratios have a significant effect on the condensed degrees of PO 4 groups. Furthermore, TG-DSC, IR, UV-Vis-NIR diffuse reflectance spectra and SHG test for title compounds have also been reported.
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RSC Advances
·
2021
·Vol. 11
·期 58
·36769-36776
·
IF 3.361
Qing Gao,Yang Zang,Ju Xie,Yongchuan Wu,Huaiguo Xue
In this work, an electrochemical sensor was designed for trace monitoring of bisphenol A (BPA) by decorating a hybrid bilayer molecularly imprinted membrane (MIM) on a multi-walled carbon nanotube-modified glassy carbon electrode. When BPA in the MIM was eluted, a composite molecularly imprinted electrochemical sensor was constructed. Under optimal conditions, the developed sensor showed two linear relationships between ΔIp and BPA concentration in the range of 0.04 μM to 8 μM, as well as good selectivity and stability, and was also applied to detect BPA in water samples with desirable recoveries ranging from 92.0% to 107.0%.
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ACS Omega
·
2021
·
IF 3.512
Xu Chen,Xingyu Ouyang,Jiayi Li,Yi-Lei Zhao
Laccase–mediator systems (LMSs) have been intensively investigated in lignin degradation. Although only natural metabolites are available for fungal lignin degradation, mediator molecules from metabolites have received substantially less attention than artificial organic–synthetic compounds. It remains unclear which metabolites can accelerate laccase-catalyzed reactions and how those natural mediators influence lignin degradation. In this work, we evaluated Trametes versicolor laccase-catalyzed reaction kinetics on a lignin guaiacyl subunit model (guaiacylglycerol-β-guaiacyl ether, G-β-GE) in the presence of a group of lignin syringyl subunit molecules: syringaldehyde, acetosyringone, and methyl syringate. We then compare their performance to a well-known synthetic mediator ABTS, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid). Time-resolved UPLC-TOF-MS revealed that the syringyl mediators were more effective in accelerating the β-O-4 cleavage and Cα-oxidation of G-β-GE than ABTS under laccase-catalysis, despite the syringyl compounds possessing slower individual oxidation rates. In addition, the product profile of polymerization was also promoted dramatically, compared to that of the ABTS/laccase system. The LMS kinetic modeling suggested that mediator–substrate aggregation played a critical role in the laccase–mediator system; in which, the lignin syringyl and guaiacyl subunits likely form a π–π stacking van der Waals complex that can be oxidized faster than the syringyl or guaiacyl monomers by themselves. This syringyl–guaiacyl aggregation hypothesis postulates that the weak interactions in lignin biopolymers are able to accelerate the laccase-catalyzed biodegradation.
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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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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 24
·10959-10970
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IF 3.591
Sethupathi Shanmugasundaram,Hairus Abdullah,Noto Susanto Gultom,Hardy Shuwanto,Dong-Hau Kuo
Hydrogen is an inevitable energy source to replace fossil fuels in the future. Herein, we report Ni-doped ZnIn2(O,S)4/In(OH)3 heterojunction composites with different sulfur contents to support green hydrogen gas evolution. A simple one-step hydrothermal preparation process was carried out by simultaneously adding all chemical precursors during the synthesis of composites. The as-prepared composites were carefully characterized by XRD, FE-SEM, TEM, XPS, DRS, TPC, MS, EIS and CV techniques, which confirmed their performance in the hydrogen evolution reaction (HER) under visible-light illumination. With increasing sulfur content, XRD analysis indicated the gradual formation of Ni-doped ZnIn2(O,S)4 co-existing with the In(OH)3 phase. The highest hydrogen evolution rate of 2100 μmol g−1 h−1 under visible-light illumination was achieved in the presence of the Ni-doped ZnIn2(O,S)4/In(OH)3 composite. Its excellent photocatalytic performance is related to the good separation of photocarriers. XPS analysis suggests the formation of positively and negatively charged defects on catalyst surfaces which attract the photogenerated electrons and holes, respectively, thus leading to an extended photocarrier lifetime. Furthermore, the coupling effect with In(OH)3 provides a more positive conduction band (CB) relative to that of the Ni-doped ZnIn2(O,S)4 phase for facile electron transfer. A plausible HER mechanism based on the experimental data is proposed in this work.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaogong Lv,Chengjun Zhu,Yiming Wang,Lei Wang,Jianming Shi
Kesterite Cu 2 Zn 1- x Cd x Sn(S,Se) 4 (CZCTSSe) alloy thin films were fabricated by the water-based solution approach. The influence of Cd doping on the morphology, phase structure, element valence states, optical, electrical, and device performance were comprehensively examined. Cd was clearly alloyed into the Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber layer to form the CZCTSSe compound. By controlling the relative Cd content, band gap values ( E g ) of the CZCTSSe thin films were engineered between 1.10 eV and 1.21 eV. In addition, doping with Cd led to the enhancement of grain growth as well as improvement of the conductivity and photoelectric property of the absorber layer. In particular, the CZCTSSe ( x = 0.4) absorber layer exhibited a pure phase, larger grain size, compact and uniform topography, suitable band gap, Cu-poor and (Cd+Zn)-rich composition, higher conductivity and better photoelectric response. Power conversion efficiency (PCE) is improved from 4.37% of the CZCTSSe ( x = 0.0) device to 5.16% of CZCTSSe ( x = 0.4) device, and the increases of short-circuit current ( J sc ) achieved to 8.94 mA/cm 2 . The encouraging results suggest that doping of Cd is an effective way to improve CZTSSe film properties and promote device efficiency.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Rui Shi,Zhijuan Zhang,Fang Luo
Due to environmental pollution caused by organic pollutants, there is an urgent need to develop renewable and environmentally friendly energy sources. In this study, N-doped graphene-based CuO/WO 3 /Cu photocatalyst (CuO/WO 3 /Cu@CN) was prepared for degrading organic pollutants by using Cu(salen)PW 12 complex as the precursor and GO as the substrate. The CuO/WO 3 /Cu@CN photocatalyst not only solved the problem that CuO/WO 3 heterojunction easily expands into powder and causes poor recyclability, but also effectively promoted the separation of photoinduced e - and h + and inhibited their recombination. The catalyst can effectively catalyze the decomposition of 4-nitrophenol, and the cycle test confirmed that it has good cycle stability. Under UV–Vis light irradiation, CuO/WO 3 /Cu@CN can effectively degrade four kinds of organic dyes and the mechanism of photocatalytic degradation of organic dyes was deduced. It is worth noting that N-doped graphene regulates the band-gap of the material, leading CuO/WO 3 /Cu@CN to generate hydrogen in the photocatalytic process. This study is expected to provide a promising way for effective degradation of organic pollutants.
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Soft Matter
·
2021
·Vol. 17
·期 9
·2490-2499
·
IF 3.679
Meihua Gao,Na Du,Zhiyin Yao,Ying Li,Nan Chen,Wanguo Hou
Simple single-chain amphiphiles (SCAs) can form vesicular structures in their single-component aqueous solutions, which has attracted great attention, but the understanding of their aggregation behavior is still limited. In this work, the aggregation behavior of 4-dodecylbenzene sulfonic acid (DBSA), a typical simple SCA, in water was investigated. The structure and properties of the aggregates formed were determined. In particular, the effect of wet–dry cycles on the structures of aggregates was examined. The mechanisms of aggregate formation and structural transition were discussed. It was found that the increase of DBSA concentration can drive the occurrence of a micelle-to-vesicle transition, showing a critical micelle concentration and critical vesicle concentration of ∼0.53 and 2.14 mM, respectively. The vesicles formed coexist with micelles in solution, with a unilamellar structure and ∼80 nm size, and exhibit size-selective permeability. In addition, the vesicles show remarkable stability upon long-term storage, exposure to high temperature, and freeze–thaw cycles. The H-bonding interaction between DBSA species and the interdigitated structure of alkyl chains in bilayers play a key role in the formation and stability of DBSA vesicles. Interestingly, it was found that the wet–dry cycle can induce a micelle-to-vesicle transition and an obvious increase in the size of the original vesicles, accompanied by the formation of some multilamellar vesicles. This work provides a better understanding of the aggregation behavior of simple SCAs in their single-component aqueous solutions.
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Experimental and Therapeutic Medicine
·
2021
·Vol. 21
·期 3
·1-1
·
IF 2.447
Qing Lin,Weili Wang,Liping Yang,Xiaohua Duan
Damage to the blood‑brain barrier (BBB) during the process of cerebral ischemic injury is a key factor that affects the treatment of this condition. The present study aimed to assess the potential effects of 4‑methoxybenzyl alcohol (4‑MA) on brain microvascular endothelial cells (bEnd.3) against oxygen‑glucose deprivation/reperfusion (OGD/Rep) using an in vitro model that mimics in vivo ischemia/reperfusion injury. In addition, the present study aimed to explore whether this underlying mechanism was associated with the inhibition of pro‑inflammatory factors and the activation status of the PI3K/Akt signaling pathway. bEnd.3 cells were subjected to OGD/Rep‑induced injury before being treated with 4‑MA, following which cell viability, lactate dehydrogenase (LDH) release and levels of nitric oxidase (NO) were detected by colorimetry, pro‑inflammatory factors including tumor necrosis factor‑α (TNF‑α), interleukin (IL)‑1β and IL‑6, were detected by ELISA. The expression levels of occluding and claudin‑5were evaluated by immunofluorescence staining. The expression levels of AKT, phosphorylated (p)‑Akt, endothelial nitric oxide synthase (eNOS) and p‑eNOS were also measured by western blot analysis. After bEnd.3 cells were subjected to OGD/Rep‑induced injury, cell viability and NO levels were significantly decreased, whilst LDH leakage and inflammatory factor (TNF‑α, IL‑1β and IL‑6) levels were significantly increased. Treatment with 4‑MA significantly ameliorated cell viability, LDH release and the levels of NO and pro‑inflammatory factors TNF‑α, IL‑1β and IL‑6 as a result of OGD/Rep. Furthermore, treatment with 4‑MA upregulated the expression of occludin, claudin‑5, Akt and eNOS, in addition to increasing eNOS and AKT phosphorylation in bEnd.3 cells. These results suggest that 4‑MA can alleviate OGD/Rep‑induced injury in bEnd.3 cells by inhibiting inflammation and by activating the PI3K/AKT signaling pathway as a possible mechanism. Therefore, 4‑MA can serve as a potential candidate for treating OGD/Rep‑induced injury.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yuxin Li,Li Liu,Zeming Wang,Lixiang Zhou,Yeqing Lan,Cheng Chen
4-aminophenylarsonic acid ( p -ASA) is usually employed as feed antibiotics which can kill bacteria, protozoa and spirochetes. When p -ASA is released into the environment by biological metabolism, it could be broken down to produce hypertoxic inorganic arsenic, including arsenite (AsO 3 3- ) and arsenate (AsO 4 3- ). In this study, cobalt and lanthanum composites loaded on rice straw biochar labelled as Co 3 O 4 -La 2 CO 5 @RSBC was obtained. The material was used as an efficient catalyst for peroxymonosulfate (PMS) activation and adsorbent to achieve the simultaneous degradation of p -ASA and adsorption of arsenic. 100% decomposition of p -ASA (50 μmol L -1 ) could be realized within 30 min, coupled with nearly complete removal of inorganic arsenic during 80 min at initial pH = 7. Co 3 O 4 -La 2 CO 5 @RSBC also possessed superior reusability and stability. Even in the third cycle, more than 95% of p -ASA was decomposed and meanwhile 92.5% of inorganic arsenic was removed. No cobalt ions were detected, and the concentration of lanthanum ions in the three cycles ranged from 8.05 to 9.90 mg L -1 , which was much lower than those reported in previous studies. A series of the material characterizations, electron paramagnetic resonance technology and scavenger tests were utilized to unveil the possible catalytic mechanism and the transformation pathways of p -ASA and arsenic. It was confirmed that 1 O 2 , O 2 ∙ - , OH ∙ , and SO 4 ∙ - generated from the PMS activation were responsible for the degradation of p -ASA and the oxidation of As(III) to As(V). Meanwhile, As(V) was rapidly adsorbed by Co 3 O 4 -La 2 CO 5 @RSBC. This study provides us with a novel and efficient approach to control p -ASA pollution in aqueous solution.
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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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