JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Jingzhen Wang,Yingnan Wang,Chunshuai Cao,Ying Zhang,Yinqing Zhang,Lingyan Zhu
Perfluorooctanoic acid (PFOA) is highly stable due to the strong C F bond and extremely difficult to be removed by conventional photocatalysts. In this study, Bi doped BiOI 1-x F x solid solutions with hollow microsphere structure were prepared through a facile one-step hydrothermal method. Compared with pure BiOI and BiOF, the band gap of the Bi/BiOI 1-x F x solid solutions was significantly reduced, thus promoting the visible light absorbance. The cavity structure of the BiOI 1-x F x solid solutions enhanced the surface areas and active sites for reaction. The local electromagnetic field dominated by surface plasmon resonance (SPR) effect of Bi metal on the surface favored the separation of the photoinduced charge pairs. As a consequence, Bi/BiOI 0.8 F 0.2 (x = 0.20, the doping amount of fluorine was 20 %) composite displayed the best photocatalytic performance for decomposing PFOA, and 40 mg/L PFOA could be removed within 2 h illumination. The degradation rate constant (k = 0.0375 min −1 ) of PFOA by Bi/BiOI 0.8 F 0.2 was about tenfold of that by pure BiOI and BiOF. Superoxide radical ( · O 2 -) predominated in the degradation of PFOA by Bi/BiOI 0.8 F 0.2 , and the possible degradation pathway of PFOA by Bi/BiOI 0.8 F 0.2 was proposed. This work provides a highly efficient catalyst for the practical application in removal of highly persistent PFOA.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 8
·2000162
·
IF 3.217
Qingxiao Meng,Jianyong Feng,Huiting Huang,Xiaopeng Han,Zhi Zhu,Tao Yu,Zhaosheng Li,Zhigang Zou
Both phase and morphology of perovskite films are very important for high-performance optoelectronic devices. Although a two-step method based on CsBr ethylene glycol monomethylether (EGME) solution can prepare pure-phase CsPbBr 3 films, they have a poor morphology due to excessive Ostwald ripening. Herein, a bi-solvent engineering strategy is demonstrated to simultaneously optimize phase and morphology of CsPbBr 3 films in a two-step solution method, which uses the bi-solvents of EGME and isopropanol (IPA) instead of EGME for CsBr solution at the second step. Optimizing the volume ratio of bi-solvents and immersion time can control the Ostwald ripening effectively and result in pure-phase, compact, and smooth CsPbBr 3 films. Finally, the prepared films are applied to perovskite solar cells (PSCs) with a structure of fluorine-doped tin oxide (FTO)/compact TiO 2 (c-TiO 2 )/CsPbBr 3 /carbon. In comparison with EGME, the champion power conversion efficiency (PCE) of devices from EGME/IPA bi-solvents increases from 3.57% to 7.29% owing mainly to higher coverage, smoother surface, and lower trap density of CsPbBr 3 films from EGME/IPA bi-solvents. This work provides a simple and efficient method for the preparation of high-quality CsPbBr 3 films.
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CRYSTENGCOMM
·
2020
·Vol. 22
·期 8
·1368-1380
·
IF 3.117
Hui Zhou,Kaleemullah Kalware,Ming Shen,Songtao Zhong,Yufeng Yao
A series of BiOCOOH and Bi/BiOCOOH heterojunction micro-/nanostructures with various morphologies have been successfully synthesized by a one-step hydrothermal process with the assistance of formamide. The morphology, structure and composition of the as-obtained samples and the effect of formamide were systematically characterized and investigated. The results reveal that formamide plays multiple roles in the synthesis of the BiOCOOH and Bi/BiOCOOH heterojunctions, which acts as the carbon and alkali source. Moreover, the formic acid abundantly provided by the hydrolysis of formamide serves as the reductant and structure-directing agent. The photocatalytic activities of all the catalysts were evaluated by the degradation of rhodamine B (RhB) and reduction of potassium dichromate (K2Cr2O7) under simulated sunlight irradiation. It is found that the photocatalytic activity is closely related to the morphology and composition of the photocatalyst. The well-defined 3D flower-like BiOCOOH prepared at 20 vol% formamide shows a higher photocatalytic activity than the other BiOCOOH samples, which could be attributed to its hierarchical nanostructure, larger specific surface area and stronger adsorption capacity. Meanwhile, the Bi/BiOCOOH heterojunction obtained at 60 vol% formamide shows the best photocatalytic performance due to the increased light absorbance capacity and more efficient separation and transfer of photogenerated carriers with the existence of in situ deposited metallic Bi. Trapping experiments reveal that h+ and ˙O2− are the main active species in the photodegradation process and a possible photocatalytic mechanism is proposed.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Han Ren,Xuan Liu,Lu Yan,Yuanyuan Cai,Chongyang Liu,Lingxing Zeng,Aihua Liu
The hierarchical porous carbon with high specific surface area was facilely synthesized by calcination of Enteromorpha prolifera (EP), a renewable ocean waste biomass. The resultant carbon exhibited bienzyme mimetic properties including oxidase-like and peroxidase-like activities, which can be regulated by varying carbonized temperature. The reaction mechanism of the oxidase-like activity of EP-based hierarchical porous carbon (EPC) contributes to singlet oxygen and superoxide anions generated during the reaction, while the peroxidase-like activity arises from hydroxyl radicals. Finally, a sensitive colorimetric biosensor for acid phosphatase was explored based on the oxidase-like activity, demonstrating a linear range of 0.5–15 U/L and the limit of detection (LOD) of 0.1 U/L (S/N = 3). A fluorescent biosensor for H 2 O 2 was also developed with the linear range of 0.05–80 μM and a LOD of 0.017 μM (S/N = 3), based on OH produced with the peroxidase-like activity, which react with terephthalic acid to form 2-hydroxyterephthalic acid. Further, incorporated with glucose oxidase, fluorometric sensing of glucose was realized with the linear range of 0.05–10 mM and a LOD of 30 μM. The bi-enzyme mimics also exhibited high reproducibility and stability. Thus, this EPC can be promising candidates for broad applications in sensing, nanomedicine, industrial catalysis and environmental engineering.
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Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 36
·7492-7505
·
IF 6.331
Wendi Ma,Mingjuan Zhou,Wenying Dong,Shanshan Zhao,Yilong Wang,Jihang Yao,Zhewen Liu,Hongshuang Han,Dahui Sun,Mei Zhang
A resveratrol-loaded bi-layered scaffold (RBS) that consists of a resveratrol-loaded poly(lactic-co-glycolic acid) (Res-PLGA) electrospinning nanofiber mat (upper layer) and an alginate di-aldehyde (ADA)–gelatin (GEL) crosslinking hydrogel (ADA–GEL) (lower layer) was fabricated as a wound dressing material. It was made through mimicking the epidermis and dermis of the skin. The RBS exhibited good hemostatic ability and proper swelling ability. Furthermore, HaCaT cells and human embryonic skin fibroblasts (ESFs) were also cultured in the nanofiber layer and hydrogel layer of RBS, and the results indicated that both HaCaT and ESFs could grow well in the materials. The in vivo experiment using a Sprague-Dawley (SD) rat skin wound as a model showed that the RBS could accelerate the wound healing rate compared with the Res-PLGA group and ADA4–GEL6 group. These results indicated that this resveratrol-loaded bi-layered scaffold can be a potential candidate in promoting wound healing.
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Qian Wang,Huanshun Yin,Jia Ding,Yunlei Zhou,Shiyun Ai
5-Formyluracil (5fU) is considered an important epigenetic modification agent involved in gene regulation, cell differentiation, and development. 5fU exists in many cells and tissues but is highly similar to the structure of 5-formylcytosine (5fC) and is less abundant in genome. Therefore, the development of a rapid, sensitive, and highly selective method to detect 5fU is desired. In this study, a photoelectrochemical biosensor based on WS2/Bi/BiOBr nanocomposites, black TiO2 (b-TiO2), and hemin/G-quadruplex was described, which was found to be highly sensitive and selective for 5-formyluracil-2′-deoxyuridine-5′-triphosphate (5fdUTP) detection. WS2/Bi/BiOBr was first employed as a photosensitive material, and 3,4-diaminobenzoic acid (DABA) was adopted as a 5fdUTP recognition and capture reagent, where DABA was captured by polyethylene polyamine through covalent reaction to form a stable amid bond. Then, a benzimidazole bond was formed between DABA and −CHO of 5fdUTP, and 5fdUTP was selectively captured on the electrode. Using b-TiO2 as a cross-linker, a guanine-rich ssDNA sequence was further immobilized on the electrode surface by covalent reaction with the 5fdUTP phosphate group. With the assistance of K+ and hemin, the hemin/G-quadruplex structure was formed on the electrode. The hemin molecules in the structure of hemin/G-quadruplex obviously enhanced the PEC response of the biosensor for detecting 5fdUTP, with a linear range of 0.005–500 nM and a detection limit of 1.53 pM (S/N = 3). In addition, this method exhibits optimistic selectivity. The precision and accuracy of this method were evaluated by studying the content of 5fdUTP in genome DNA of crop tissues with standard addition recovery experiments.
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Processes
·
2021
·Vol. 9
·期 9
·1487
·
IF 2.847
Muhammad Faizan,Kifayat Ullah Khan Niazi,Hasnain Nawaz,Niaz Muhammad,Hao Li,Fei Dai,Ruirui Zhang,Ruixia Liu,Suojiang Zhang
In recent work, deep eutectic solvents (DESs) as ionic liquid analogues have been abundantly used in catalysis. Herein, vanadium phosphorus oxide (VPO) catalysts were synthesized from mono-, bi-, and tri- metallic DES of Nb, Zr, and Mo metal dopants as structure-directing agents and electronic promoters for n-butane selective oxidation towards maleic anhydride. Higher MA selectivity and larger n-butane conversion was successfully obtained using the newly developed catalysts, while oxidation by-product COx(CO, CO2) was minimized. Characterization techniques including FTIR, DSC, XRD, TEM, SEM, EDS, Raman spectroscopy, TGA, XPS, and NH3-TPD were employed to fully characterize the DESs, precursors and catalysts. This work led to an increase of 7.8% in MA mass yield with 16% more n-butane conversion as compared to an unpromoted VPO catalyst. Moreover, the utilization of a low-carbon alkane brought in a green impact on the chemical plant as well as the environment.Keywords:deep eutectic solvent;vanadium phosphorus oxide;n-butane selective oxidation;structure directing agent;electronic promoter
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SOLID STATE SCIENCES
·
2019
·
IF 2.155
Yunfang Huang,Hui Xu,Dan Luo,Yuezhu Zhao,Yu Fang,Yuelin Wei,Leqing Fan,Jihuai Wu
Full-spectrum-responsive Ag/Bi/BiOCl hierarchical micro-flower heterojunction via a facile in-situ solvothermal route. The samples were characterized by XRD , SEM, TEM , XPS , BET and UV–Vis–NIR. The in-situ incorporation of Bi into the semiconductor BiOCl nanosheets with oxygen vacancies could be regulated efficiently by the Ag + additive content. The samples presented a strong optical absorption in the whole region of 200–2400 nm and displayed excellent photocatalytic performance over the full solar spectrum. The presence of metallic Ag, Bi and oxygen vacancies strengthened the light absorption and promoted the charge-carrier separation of BiOCl, resulted in higher photocatalytic activity than that of pure BiOCl and P25 under UV and visible light irradiation. Furthermore, the photocatalytic responsiveness of Ag/Bi/BiOCl was successfully extended to the NIR region. On the basis of the radical species trapping experiments, h + , •O 2 − , and •OH were confirmed to be the mainly active species involved in the degradation of organic pollutants in the NIR region.
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Soft Matter
·
2018
·Vol. 14
·期 43
·8764-8770
·
IF 3.709
Botian Li,Da Xiao,Dongsheng Deng,Haimu Ye,Qiong Zhou,Liming Tang
In this study, a novel self-assembled metal–organic gel was synthesized from ferric nitrate and a di-topic ligand, bis(3-pyridyl)terephthalate. The gel consisted of a three dimensional network of uniform nanofibers. The gelation exhibited high selectivity to Fe(III) based on metal–ligand coordination. The molar ratio of Fe3+ to ligand had a large influence on the assembly process and the morphology of the gel. The metallogel displayed multi-stimuli responsiveness and excellent heat resistance, thus was further applied as a thermo-stable template for the polymerization of N,N′-methylene bisacrylamide to produce the core/shell polymer composite nanowires. Subsequently, the polymer nanotubes were obtained after ammonia post-treatment, comfirming the feasibility of the template synthesis strategy. According to the rheological measurements, the gel-like products of the composite nanowires exhibited better mechanical strength compared to the gel template.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2015
·
IF 1.098
Jun Wang,Manman Wang,Xuzhao Yang,Wenyuan Zou,Xiang Chen
The structure of a room temperature asymmetrical dicationic ionic liquid (ADIL), 1-(pyridinium-1-yl) propane-(1-methylpiperidinium) bi[bis(trifluoromethanesulfonyl)imide] ([PyC 3 Pi][NTf 2 ] 2 ), was studied by the X-ray diffraction method. Meanwhile, thermal analysis of [PyC 3 Pi][NTf 2 ] 2 was also studied using non-isothermal thermogravimetric analysis (TGA). The title crystal belongs to the triclinic with space group P ī and unit-cell parameters a = 0.95217 (8) nm, b = 1.05129 (11) nm, c = 1.70523 (14) nm, α = 89.759 (8)°, β = 80.657 (7)°, γ = 68.007 (9)°, and F (000) = 792. Thermal stability and thermal decomposition kinetics of the title compound were also investigated using TGA under the atmosphere of highly pure nitrogen. Heating curves at different rates were correlated with kinetic equations Friedman and ASTM (also called iso-conversion method). The values of average activation E (kJ·mol − 1 ) and pre-exponential constant lg A are 149.58 kJ·mol − 1 and 8.83, respectively, which were obtained by the two methods. The kinetic model function, activation energy and pre-exponential constant of this reaction using the multivariate non-linear-regression method were f ( α ) = (1 − α )(1 + 4.1870 α ), 151.04 kJ·mol − 1 and 8.81, respectively, which were basically consistent with iso-conversion methods.
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高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Yingtao Ding,Qingxiang Wang,Feng Gao,Fei Gao
In this work, a dumbbell-shaped bi-acetylferrocene ethylenediamine complex, (AFc) 2 -en (AFc = acetylferrocene, en = ethylenediamine) was synthesized and its interaction with double-stranded DNA (dsDNA) was comprehensively studied by electrochemical methods on a gold electrode. The experimental results reveal that the highly electroactive (AFc) 2 -en complex can interact with dsDNA via a specific bis-groove binding mode. The binding constant and binding site size between the two species were determined to be 3.7 × 10 5 L mol −1 and 4.2, respectively. The surface-based studies further show that (AFc) 2 -en presents the stronger electrochemical response on dsDNA modified electrode than on the single-stranded DNA (ssDNA) modified electrode, suggesting that the complex can well distinguish dsDNA from ssDNA. Based on this characteristic, the bi-acetylferrocene complex was utilized as an electrochemical hybridization indicator in a DNA biosensor for the detection of oligonucleotides from CaMV35S promoter gene. The specificity experiments indicate that the biosensor can well discriminate the complementary sequence from the base-mismatched and the non-complementary sequences. The complementary target sequence can be quantified over a wide range from 1.0 × 10 −14 mol L −1 to 1.0 × 10 −6 mol L −1 with a detection limit of 2.0 × 10 −15 mol L −1 .
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NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 11
·8848-8854
·
IF 3.086
Yan Wang,Lei Sun,Bingqing Yu,Shaotong Li,Shian Zhong
A facile one-pot preparation of aminophenylboronic acid (APBA) and poly(ethyleneglycol) (PEG) bi-functionalized silica particles named SiO2@APBA@PEG by the aid of epoxy silanes is described in this work. The as-prepared particles could not only selectively extract the catecholamine through boronate binding but could also effectively resist protein adsorption using PEG brushes; FT-IR spectra and contact angle measurements proved that APBA and PEG groups were successfully introduced into the surface of silica. The maximum adsorption capacities towards dopamine (DA) and levodopa (L-DOPA) were found to be 254.45 and 104.71 μmol g−1, respectively. The as-prepared material was used as a solid phase extraction (SPE) sorbent for the extraction of catecholamine from rat serum. The recoveries of DA and L-DOPA were 95 ± 3.21% and 93 ± 3.57%, meanwhile, proteins were eliminated. The obtained results indicated that the SiO2@APBA@PEG particles were qualified for efficient purification of catecholamine from complex biological samples.
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