Catalysts
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2019
·Vol. 10
·期 1
·6
·
IF 3.444
Jia Huang,Gang Nie,Yaobin Ding
To develop highly efficient heterogeneous photocatalysts for the activation of dissolved oxygen is very interesting in the field of green degradation of organic pollutants. In the paper, oxygen atom doped g-C3N4(O-g-C3N4) was prepared via a facile chemical oxidation of g-C3N4by peroxymonosulfate. X-ray photoelectron spectroscopy analysis suggests the oxidative treatment of g-C3N4by peroxymonosulfate evidently increased atomic percentage of oxygen on O-g-C3N4surface to 6.9% as compared with 1.8% for g-C3N4. Meanwhile, the doped oxygen atom mainly existed as carbonyl and carboxyl groups. Optical characterization indicates the introduction of oxygen improved the response of O-g-C3N4to visible light, and more obviously, separation of photo-generated h+-e−. 4-chloro-7-nitrobenzo-2-oxa-1,3-diazole (NBD-Cl) probe measurement indicates the formation of O2•−was dramatically enhanced through activation of dioxygen by photo-generated electrons in the O-g-C3N4photocatalytic system. Through high performance liquid chromatography (HPLC) and Liquid chromatography–mass spectrometry (LC-MS) analysis, it was found rhodamine B (RhB) photocatalytic degradation by O-g-C3N4followed step by step N-deethylation reaction pathways induced by the formed O2•−, rather than the non-selective decomposition of the chromophore in RhB by other radicals, such as hydroxyl radicals. This study provides a facile method to develop oxygen atom doped g-C3N4photocatalyst, and also clarifies its photocatalytic activation mechanism of molecular oxygen for N-deethylation reaction of RhB.Keywords:photocatalysis;oxygen doped g-C3N4;activation of dioxygen;superoxide radicals;selective N-deethylation of rhodamine B
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Journal of the Taiwan Institute of Chemical Engineers
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2018
·
IF 3.849
Noor Ahmed Nahyoon,Lifen Liu,Kané Rabé,Sarwan Ahmed Nahyoon,Azmat Hussain Abro,Fenglin Yang
In this study, a novel heterojunction silver phosphate-iron-graphene oxide -titanium phosphate (Ag 3 PO 4 /Fe/GTiP) composite was fabricated by the simple chemical process. The prepared composite was characterized by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV-vis), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and electrochemical impedance spectroscopy (EIS). This catalyst was used as anode material in photocatalytic fuel cell (PFC) with cathode catalyst ZnIn 2 S 4 for efficient degradation of rhodamine B (RhB) with sustainable electricity generation. In PFC the degradation of 90% RhB (10 mg/l) with electricity generation of 0.18 V during 70 min was achieved at pH-3 of 0.05 M Na 2 SO 4 electrolyte. By increasing the RhB concentration up to 100 mg/l the electricity generation was increased up to 0.55 V. Under pure photocatalysis degraded 92.14% RhB (10 mg/l) with Ag 3 PO 4 /Fe/GTiP in 90 min. The discoloration efficiency and electricity generation are influenced by factors such as pH, external resistance, dye concentration, and aeration rate in the PFC. After four cycles of reuse, there was no decrease in PFC performance, which proves its positivity for sustainable energy generation as a greener technology.
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TETRAHEDRON
·
2015
·
IF 2.641
Xiong-Li Liu,Wen-Hui Zhang,Zhen Yao,Xiong-Wei Liu,Li-Jun Peng,Zhi Zhao,Yi Lu,Ying Zhou,Wei-Cheng Yuan
A new methodology was developed for the synthesis of hexahydro-1 H -pyrido[2,3- b ]indol-2-one scaffolds via a sequential Michael addition/amidation/reductive cyclization process. A wide variety of products bearing a hexahydro-1 H -pyrido[2,3- b ]indol-2-one core with varying degrees of substitution around it, which is a key structural skeleton found in a large number of biologically active natural products and pharmaceutical compounds, were obtained smoothly with high efficiency (up to overall yield of 67%). Furthermore, their biological activities have been preliminarily demonstrated by in vitro evaluation against human prostate cancer cells PC-3, human lung cancer cells A549 and human leukemia cells K562 by the MTT-based assays, using the commercially available standard drug Cisplatin as a positive control. These results suggested there is a trend that lipophilic groups improve the potency, and also suggested a carbonyl moiety located in the hexahydro-1 H -pyrido[2,3- b ]indol-2-one scaffolds is beneficial for the activity. The results also demonstrated that most of the compounds showed considerable cytotoxicities to these three cell lines K562, A549 and PC-3, and that hexahydro-1 H -pyrido[2,3- b ]indol-2-one scaffolds may be potential leads for further antitumor activity screenings.
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RSC Advances
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2015
·Vol. 5
·期 130
·107964-107969
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IF 3.84
Xiaolei Zhang,Jingjing Deng,Guoyue Shi,Tianshu Zhou
In this work, we for the first time developed a visual and fluorescent dual probe for hypochlorite (ClO−) based on stimuli-responsive valence-tautomeric infinite coordination polymer (ICP) nanoparticles encapsulated with a fluorescent dye, i.e., rhodamine B (RhB). In the absence of ClO−, the as-formed RhB@{Co(3,5-dbsq)(3,5-dbcat)(bix)} ICP nanoparticles are well dispersed and quite stable in aqueous solution. However, the addition of ClO− into the dispersion of RhB@{Co(3,5-dbsq)(3,5-dbcat)(bix)} destroys the {Co(3,5-dbsq)(3,5-dbcat)(bix)} network structure, resulting in the release of RhB from ICP nanoparticles into the solvent. As a consequence, the color of the dispersion changed from purple to orange-red and, in the meantime, the fluorescence of RhB turns on, which constitutes a new mechanism for colorimetric and fluorescence dual-model sensing of ClO−. With the method demonstrated here, the ClO− in tap water can be easily visualized by the naked eye and detected quantitatively through double channels. This study not only offers a new method for on-the-spot visible detection of ClO− in environmental samples, but also provides a strategy for designing dual mode sensing mechanisms based on the stimulus response of valence-tautomeric ICP nanomaterials.
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ANALYST
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2015
·Vol. 140
·期 5
·1731-1738
·
IF 4.107
Di Chen,Yun-Qing Huang,Xiao-Mei He,Zhi-Guo Shi,Yu-Qi Feng
A rapid analysis method by coupling carbon nanotube film (CNTF) microextraction with desorption corona beam ionization (DCBI) was developed for the determination of Sudan dyes (I–IV) and Rhodamine B in chilli oil samples. Typically, CNTF was immersed into the diluted solution of chilli oil for extraction, which was then placed directly under the visible plasma beam tip of the DCBI source for desorption and ionization. Under optimized conditions, five dyes were simultaneously determined using this method. Results showed that the analytes were enriched by the CNTF through the π–π interactions, and the proposed method could significantly improve the sensitivities of these compounds, compared to the direct analysis by DCBI-MS/MS. The method with a linear range of 0.08–12.8 μg g−1 and good linear relationships (R2 > 0.93) in a multiple reaction monitoring (MRM) mode was developed. Satisfactory reproducibility was achieved. Relative standard deviations (RSDs) were less than 20.0%. The recoveries ranged from 80.0 to 110.0%, and the limits of detection (LODs) were in the range of 1.4–21 ng g−1. Finally, the feasibility of the method was further exhibited by the determination of five illegal dyes in chilli powder. These results demonstrate that the proposed method consumes less time and solvent than conventional HPLC-based methods and avoids the contamination of chromatographic column and ion source from non-volatile oil. With the help of a 72-well shaker, multiple samples could be treated simultaneously, which ensures high throughput for the entire pretreatment process. In conclusion, it provides a rapid and high-throughput approach for the determination of such illicit additions in chilli products.
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PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 27
·期 1
·90-97
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IF 1.757
Tong-Mou Geng,Chang Guo,Yan-Jie Dong,Meng Chen,Yu Wang
A hydrophobic organic monomer GRBE with a polymerizable methacrylester moiety had been synthesized by reaction of rhodamine B-ethanediamine with glycidyl methacrylate. A water-soluble polymeric chemosensor poly(VP-GRBE) had been prepared via copolymerization with a hydrophilic comonomer (vinylpyrrolidone) and GRBE, which was able to sense environmentally poisonous cations in completely aqueous media. The chemosensor was a derivative of rhodamine B, which behaved as a fluorescent and chromogenic sensor toward various heavy cations, particularly Cr 3+ , Fe 3+ , and Hg 2+ . Titration curves of Cr 3+ , Fe 3+ , and Hg 2+ were constructed using rapid, cheap, and widely available technique of fluorescence spectroscopies. The detection limits for Cr 3+ , Fe 3+ , or Hg 2+ ions were found to be 2.20 × 10 −12 , 2.39 × 10 −12 , and 1.11 × 10 −12 mol/l in the same medium, respectively. Moreover, a colorimetric response from the polymeric chemosensor permitted the detection of Cr 3+ , Hg 2+ , or Fe 3+ by “naked eye” because of the development of a pink or brown yellow color when Cr 3+ , Hg 2+ , or Fe 3+ cations interacted with the copolymer in aqueous media. Copyright © 2015 John Wiley & Sons, Ltd.
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POLYMER DEGRADATION AND STABILITY
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2015
·
IF 3.163
Lidong Feng,Xinchao Bian,Gao Li,Zhiming Chen,Xuesi Chen
A series of novel biodegradable polyurethanes (PELU) based on poly(ethylene glycol)- b -polylactide copolymers were prepared by chain extension with isophorone diisocyanate (IPDI). The PELUs were used to toughen polylactide (PLA) by melt blending. The results of DSC and SEM uniformly indicated that the PELUs were partially compatible with PLA and the PLA segments in PELU could effectively improve the compatibility between PLA and PELU. PELU as a plasticizer could significantly improve the toughness of PLA materials and remain their high strength and modulus. When the PELU content was 10–20 wt%, the elongation at break of PLA/PELU-40/ADR (0.4 wt%) and PLA/PELU-50/ADR (0.4 wt%) reached up to 250%–350%. When the PELU content was 20 wt%, the tensile strength and modulus of PLA blends containing PELU-30, PELU-40 and PELU-50 maintained 35–38 MPa and 1300–1500 MPa, respectively. The moisture absorption of the PLA materials enhanced because of blending with PELU containing PEG segments, but the hydrolytic degradation property of PLA materials was little affected by this.
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Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 4
·1672-1678
·
IF 8.262
Ying Chang,Conghui Yuan,Yuntong Li,Cheng Liu,Tong Wu,Birong Zeng,Yiting Xu,Lizong Dai
A valid pathway has been exploited to create a B,N co-doped carbon shell on the surface of TiO2 nanoparticles (TiO2@CNB) as a support of Pt nanoparticles. The shell thickness of TiO2@CNB can be easily controlled by pyrolysis of TiO2@polymer networks. The as-prepared Pt/TiO2@CNB catalyst with a thicker CNB layer of 5.0 ± 0.5 nm shows improved performance for the oxygen reduction reaction (ORR) with high onset (0.65 V) and half-wave potentials (0.56 V), which are significantly higher than those of commercial Pt/C (20 wt%) catalysts. For the methanol oxidation reaction (MOR), the Pt/TiO2@CNB catalyst with a moderate CNB layer of 3.3 ± 0.3 nm thickness demonstrates the highest activity and stability compared with that with a CNB thickness of 2.1 ± 0.3, or 5.0 ± 0.5 nm, even Pt/C. Our findings indicate that the synergy between Pt nanoparticles and the B,N co-doped carbon shell, as well as the shell thickness plays a key role in improving the electrochemical performances of the Pt/TiO2@CNB composite materials.
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高影响因子
Journal of Environmental Chemical Engineering
·
2016
·
IF 0
Fang Wang,Yong Tao Zhang,Yanli Xu,Xing Wang,Sunfeng Li,Hanbiao Yang,Xueting Liu,Fengyu Wei
N-K 2 Ti 4 O 9 /g-C 3 N 4 /UiO-66 ternary composites were successfully synthesized by a solvothermal method, and were characterized by powder X-ray diffraction, UV–vis diffuse reflectance spectroscopy, the valence band X-ray photoelectron spectroscopy, field emission transmission electron microscopy , photoluminescence emission spectra and N 2 adsorption-desorption. Photocatalytic activities of N-K 2 Ti 4 O 9 , g-C 3 N 4 , UiO-66, N-K 2 Ti 4 O 9 /g-C 3 N 4 binary composites and the ternary composites were investigated by the degradation of Rhodamine B (RhB) under visible light irradiation. The results show that the ternary composites exhibit higher photocatalytic activity as compared with the binary composites and the pure materials. The synergistically enhanced photocatalytic activity of the ternary composites is due to coupling direct solid-state Z-scheme N-K 2 Ti 4 O 9 /g-C 3 N 4 heterojunction with high adsorption capacity of UiO-66 for RhB.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 11
·2826-2832
·
IF 5.256
Hang Ao,Hui Feng,Xiaolu Huang,Meizhi Zhao,Zhaosheng Qian
Dynamic covalent B–O bonds are introduced to the design of a reversible fluorescence nanoswitch in response to the external stimulus of pH. This nanoswitch is based on a phenylboronic acid functionalized carbon quantum dot (PBA–CQD) nanoprobe, and constructed with reference to the two facts that the PBA–CQD probe can bind to p-nitrophenol to form a non-fluorescent conjugate via B–O bonds, and that the making and breaking of the B–O bonds between them can be controlled by pH changes. Excellent reversibility of this nanoswitch is illustrated by switching of the pH from 4 to 8. The reaction between the PBA–CQD nanoprobe and the p-nitrophenol resulting in switching off the fluorescence is further utilized to design a general detection strategy for enzyme activity when substrates that can generate p-nitrophenol through enzymatic reactions are chosen. The feasibility of the detection strategy is qualitatively assessed using α-glucosidase and β-galactosidase, and its practicability to quantitatively monitor enzyme activity is also demonstrated by taking α-glucosidase as an example. The detection limit of this method can be as low as 0.33 U L−1, which is much lower than those reported previously and is sufficiently low to be capable of α-glucosidase level detection in practical human samples. This study demonstrates excellent usability of dynamic covalent B–O bonds in the design of reversible switches and in the general detection of enzyme activity, and provides a sensitive, real-time assay for α-glucosidase based on carbon quantum dots.
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Arabian Journal of Chemistry
·
2024
·
IF 5.3
Jie Lian,Wenyu Gong,Jianing Guo,Mingxing Wu
Construction of mesoporous structure and improving the conductivity of carbon counter electrode are feasible paths to enhance the catalytic activity in dye-sensitized solar cells (DSCs) toward the I 3 - /I - redox couple regenerating (IRR). Herein, mesoporous carbon fiber (PCf) has been first synthesized and the DSCs using PCf counter electrode results in a power conversion efficiency (PCE) of 7.12%, significantly surpassing the PCE of 6.01% generated by the DSCs with carbon fiber (Cf) counter electrode without mesoporous structure. Additionally, doping with heteroatoms B or N can further enhance the catalytic performance of PCf. Consequently, B or N doped Cf (BPCf or NPCf) counter electrode-based DSCs achieve high PCE values of 8.43% and 7.96%, respectively, demonstrating PCE improvements of 40.3% and 32.4%. This enhancement in catalytic activity for IRR in DSCs can be first attributed to the increased specific surface area of Cf which can provide more catalytic activated sites. Meanwhile, the enhanced conductivity of PCf by heteroatoms B or N doping is also an important factor for the improved catalytic activity. This work is expected to provide potential path to enhanced the catalytic activity of carbon counter electrode in DSCs toward IRR.
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Environmental Technology & Innovation
·
2024
·
IF 6.7
Kangkang Wang,Yuli Kou,Changyan Guo,Kefu Wang,Jiang Li,Julia Schmidt,Meng Wang,Siqi Liang,Wei Wang,Yi Lu,Jide Wang
The accumulation of microplastics (MPs) in the environment and their role as carriers for ionic organic pollutants are increasingly attracting attention. This study evaluated the adsorption-desorption characteristics of the cationic organic pollutant on virgin and UV-aged non-degradable polystyrene (PS) as well as degradable poly(butylene succinate) (PBS) and poly(butylene adipate-co-terephthalate) (PBAT) MPs. The results showed that aging treatment made the surface of MPs rougher and more porous, causing the adsorption to shift from monolayer to multilayer adsorption. Aging increased the oxygen-containing groups on MPs, significantly enhancing the H bond (HB) donor capabilities of degradable aged PBS and PBAT, thereby improving adsorption by more than 10 times. This significant increase in adsorption is mainly due to the combined effects of strong HB (including ordinary HB (OHB) and charge-assisted HB (CAHB)), electrostatic interactions, and π-π interactions. Notably, the stronger HB enabled aged PBS and PBAT to achieve efficient and stable adsorption of rhodamine B over a wide pH range, with significant desorption hysteresis (HI > 1.80). This indicates that degradable aged MPs can act as carriers for long-distance pollutant transport. The significant total desorption of cationic pollutants from aged PBS and PBAT in simulated animal gastrointestinal fluids confirmed the greater environmental hazards of degradable aged MPs. This work is the first to demonstrate that degradable aged MPs, as unique HB donors, can primarily adsorb ionic organic pollutants through strong HB (CAHB and OHB), which helps assess the environmental fate of biodegradable microplastics and pollutants in aquatic systems.
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