Materials Chemistry Frontiers
·
2020
·Vol. 4
·期 11
·3216-3225
·
IF 6.788
Majid Basharat,Muhammad Shuaib Khan,Yasir Abbas,Shuangkun Zhang,Hanlin Ma,Zhanpeng Wu,Wei Liu
The utilization of solar energy is an epitome towards water splitting for hydrogen generation and environmental remediation. For efficient use of solar energy, photocatalysts capable of light-harvesting, with appropriate band energetics, that are inexpensive, stable, and scalable, are desired. Herein, a prototypical cyclotriphosphazene (P3N3)-based covalent inorganic–organic hybrid framework (CIOF) is designed with highly crosslinked aggregation that can produce hydrogen fuel from photocatalytic water splitting, as well as the degradation of industrial waste-water pollutant (rhodamine B). The P3N3-CIOF was synthesized by the aggregation, self-assembly, and subsequent polycondensation of hexachlorocyclotriphosphazene, tris(4-hydroxyphenyl)ethane and pyridine, in one-pot under ultrasonication. Morphology and structure of the newly synthesized P3N3-CIOF are characterized through scanning electron microscopy, Fourier transform infrared spectroscopy, solid-state 31P and 13C nuclear magnetic resonance spectroscopy, X-ray photoelectron microscopy, UV-visible absorbance, photoluminescence, and micro-spectrophotometry. The P3N3-CIOF shows selective response to the UV-visible light by emitting bright green (Ex. 365 nm), yellow (Ex. 420 nm), and red (Ex. 546 nm) colors. Moreover, the onset bandgap (2.14 eV) and the potential of the conduction band (−0.26 eV) and valence band (+1.88 eV) straddle the potential range for photocatalytic water splitting and dye degradation. The as-synthesized P3N3-CIOF continuously produced hydrogen fuel (24.5 μmol g−1 h−1) during photocatalytic water splitting for a period of 16 h, using Pt (3 wt%) and triethanolamine as the co-catalyst and holes scavenger, respectively. It also showed photodegradation ability to rhodamine B as a proxy dye to industrial waste-water pollutants. The plausible photocatalytic mechanism is also proposed based on the energetics of the photogenerated excitons, and scavenging experiments. These findings exemplify a critical first step towards photocatalytic hydrogen generation and remediation of organic pollutants through P3N3-CIOF, as well as motivation to engineer new materials based on aggregation-induced phenomena.
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Journal of Water Process Engineering
·
2020
·
IF 3.465
Jing Di,Minzhi Zhu,Ropafadzo Jamakanga,Xikun Gai,Yin Li,Ruiqin Yang
Peroxymonosulfate (PMS) is a strong oxidizing agent that can generate reactive oxygen species (ROSs) to decompose organic pollutants . It can be activated by either chemical catalysis or electrochemical processes, both of which are limited by low catalytic efficiency. In this study, electrochemical oxidation and advanced oxidation of PMS on a NiCo 2 O 4 nanoarray cathode were integrated to decompose Rhodamine B (RhB). The combined method exhibited faster decolourisation rates and increased reaction efficiencies compared to systems using either electrochemistry or PMS alone. The effects of pH, PMS dosage, initial RhB concentration, and current density were investigated. The activation of PMS (2 g·L −1 ) under a current density of 10 mA·cm -2 at neutral pH showed a high decolourisation efficiency of 99.7 % for the RhB solution (100 mg L −1 ) in 60 min. The corresponding total organic carbon (TOC) removal efficiency was 28.9 %. The electrode could be reused for at least four cycles while maintaining its high activity. Furthermore, scavenging experiments were conducted with various radical scavengers to identify the major ROSs. Our mechanistic study suggested that O 2 - and 1 O 2 play key roles in the degradation process. A synergistic effect was promoted by combining electrochemical and chemical processes for PMS activation . The results presented herein provide fundamental insight into advanced oxidation processes with PMS.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Shaoxiong Feng,Weigang Ding,Yan Zhang,Jingwei Wu,Zhiming Zou,Tongfa Wu,Qun Tang
A novel neodymium-based metal-organic framework (Nd-MOF) {[Nd 2 (Hpdc) 3 (H 2 O) 6 ]·3H 2 O} n (H 3 pdc = 1H-pyrazole-3,5-dicarboxylic acid) was synthesized by a simple hydrothermal method and structurally characterized. By dropped onto glassy carbon electrodes (GCE), the prepared Nd-MOF was applied to construct an efficient electrochemical sensor for the rapid and reliable electrochemical detection of Rhodamine B (RhB). This proposed Nd-MOF/GCE sensor exhibited strong accumulation ability and high electrocatalytic activity for RhB. Electrochemical oxidation signal of RhB at the Nd-MOF/GCE was greatly enhanced as compared to that at the bare GCE. The effective factors such as pH of buffer solution , amount of Nd-MOF suspension and accumulation time were optimized for the quantitative detection of RhB. Under optimum conditions, the fabricated sensor showed two wide linear ranges of 0.08–2.0 and 2.0–40 μM with a low detection limit of 3.6 nM, which was ascribed to the advantages of Nd-MOF such as large specific surface area, multiple active sites, strong accumulation ability. Moreover, the developed Nd-MOF/GCE sensor displayed good selectivity and accuracy towards RhB detection in the actual samples. Thus, this simple and efficient approach for RhB detection has good prospective for application in environmental monitoring.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 1
·509-520
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IF 2.064
Tang Chang-cun,Fang Yan-fen,Cao Xin-qiang,Tian Hai-lin,Huang Ying-ping
In this paper, bismuth oxybromide (BiOBr) photocatalysts were synthesized in the presence of tetrabutylammonium bromide (TBAB) at the different volume fractions of ethanol/water and named as BiOBr 0 , BiOBr 20 , BiOBr 50 , BiOBr 80 and BiOBr 100 , respectively. The samples were characterized and applied to the degradation of Rhodamine B (RhB) under visible-light irradiation ( λ ≥ 420 nm). The results indicated that both TBAB and ethanol significantly affected the crystal phase, morphology and surface charge distribution of BiOBr. The exposed (110) faces of BiOBr with Bi 3+ sites contributed to its photocatalytic activity via the enhanced separation of electrons and photogenerated holes as well as the better photo-stability. BiOBr 50 showed the optimal activity for the photodegradation of RhB. Superoxide radical (O ·− 2 ) as the dominant active species was responsible for the degradation of RhB.
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Journal of Materials Chemistry B
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2019
·Vol. 8
·期 5
·1033-1039
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IF 5.047
Xiao-Hui Wang,Xue-Qiao Chen,Hong-Shang Peng,Xiao-Fei Wei,Xiao-Juan Wang,Kun Cheng,Yuan-An Liu,Wei Yang
Photothermal therapy following microscopic temperature detection can avoid overheating effects or insufficient heating, and thus improve therapeutic efficacy. In this study, biocompatible dual-functional nanoparticles (NPs) are constructed from polypyrrole (PPy) and rhodamine B (RB) by a one-step modified polymerization method. The polypyrrole serves as a photothemal agent, and rhodamine B acts as a temperature-sensing probe. The polypyrrole–rhodamine B (PPy–RB) NPs possess a high photothermal effect on irradiation by 808 nm laser, and a competent temperature sensitivity for the real-time temperature monitoring based on the emission intensity response of rhodamine B. After acting on HepG2 cells, the PPy–RB NPs can effectively induce cancer cell death, and the microscopic temperature is monitored by fluorescence feedback from rhodamine B during PTT by laser confocal microscopy. Hence, the proposed approach can supply a facile and promising way for the fabrication of effective theranostic nanoplatforms assisted by self-monitoring of cancer therapeutic processes.
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PubMed
高影响因子
TALANTA
·
2019
·
IF 4.916
Yue Du,Yonghai Song,Juan Hao,Keying Cai,Nan Liu,Li Yang,Li Wang
A novel ratiometric fluorescent sensor for superoxide radical (O 2 •− ) detection was developed based on Schiff base polymer (SBP)/rhodamine-B (SBP/RDB) nanocomposites. The SBP/RDB was investigated by atomic force microscopy , scanning electron microscopy, transmission electron microscopy , X-ray powder diffraction, Fourier transform infrared spectroscopy, N 2 adsorption/desorption isotherms and fluorescence spectroscopy, etc. The results showed the SBP was two-dimensional (2D) crystalline nanosheet with the thickness of 0.5 nm. RDB could be self-assembled on each of 2D SBP surface to form SBP/RDB due to the hydrogen bond between N atoms of SBP and –COOH of RDB as well as π-π interaction. The SBP/RDB exhibited the characteristic fluorescence emission of both SBP at 485 nm and RDB at 585 nm under an excitation of 270 nm. The 2D SBP was not only acted as template to assemble RDB, but also used as reference fluorescence for O 2 •− detection. The SBP/RDB fluorescence probe for O 2 •− detection demonstrated high sensitivity and selectivity with good linear range (11.1 ± 0.76 nM–8.0 ± 0.36 μM) and low detection limit (3.7 ± 0.42 nM). Because of the low cost and simple operation, the work sheds some new light to construct ratiometric fluorescent sensors based on SBP to detect O 2 •− in drinking water and human blood serum for commercial applications.
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PubMed
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 6
·2414-2422
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IF 3.288
Panqi Huang,Jingfei Luan
A highly efficient Ag3PO4/GaOOH composite was innovatively prepared and its photocatalytic performance was evaluated through degrading rhodamine B (RhB) under illumination, in this paper. Characterizations including XRD, SEM-EDS, TEM, FT-IR, XPS, UV-Vis DRS, PL and EPR were performed to analyze the properties of the Ag3PO4/GaOOH composite. The SEM-EDS results indicated that Ag3PO4 particles were dispersed on the surface of GaOOH sticks. The (210) plane of Ag3PO4 particles and the (200) plane of GaOOH sticks were simultaneously observed in the TEM results. UV-Vis DRS analysis indicated that the spectrum of the Ag3PO4/GaOOH composite showed a significant red shift compared to that of pure GaOOH. PL spectra also indicated that the construction of the Ag3PO4/GaOOH composite significantly declined the recombination rate of photogenerated electrons-hole pairs. The photocatalytic degradation experiments showed that the 30 wt% Ag3PO4/GaOOH composite demonstrated excellent performance under illumination. After a reaction time of 60 min, the decolorization rate of RhB was up to 97.83% using the 30 wt% Ag3PO4/GaOOH composite. Further studies confirmed that the 30 wt% Ag3PO4/GaOOH composite had good stability and the contribution of active species during degradation was of the order h+ > ˙O2− > ˙OH. The results of this study would provide a new perspective for improving the applications of wide band gap semiconductors, particularly for light-induced degradation.
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ACS Applied Nano Materials
·
2019
·
IF 0
Xianke Zhang,Li Li,Yuqiang Zeng,Feng Liu,Jujun Yuan,Xiaokang Li,Yi Yu,Xiurong Zhu,Zuzhou Xiong,Huajun Yu,Yingmao Xie
Surface-fluorinated ultrathin anatase TiO2 nanosheets with exposed (001) crystal planes were synthesized via a relatively low temperature solvothermal route. These two-dimensional (2D) TiO2 nanosheets demonstrated higher photocatalytic activity for degrading Rhodamine B (RhB) under simulated sunlight illumination than the corresponding sample with less fluorine ions (F–) content, which indicates the positive effect of F– on the enhanced photocatalytic performance of TiO2 nanosheets. Furthermore, 2D/2D TiO2/g-C3N4 nanosheet heterojunctions were fabricated through a solvent evaporation process. The photocatalysis test showed that TiO2/g-C3N4 exhibited higher photocatalytic performance for degrading RhB under simulated solar light illumination than pure g-C3N4 and TiO2 nanosheets. Based on free radical trapping experiments, superoxide radicals (·O2–) and photoinduced holes (h+) were determined to be the predominant active species for photodegrading RhB. A direct Z-scheme charge transfer mechanism is proposed to understand the enhanced photocatalytic activity in TiO2/g-C3N4 nanosheet heterojunctions.
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CHIRALITY
·
2018
·Vol. 30
·期 11
·1173-1181
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IF 1.833
Jidong Yang,Xuanping Tan,Yanmei Zhao
A novel and simple method for simultaneous determination of chiral carnitine (CA) enantiomers was proposed. In this work, the rhodamine B (RhB) could react with D-CA and L-CA, and new resonance Rayleigh scattering (RRS) peaks were generated. According to the polarization experiments, it could be testified that scattering peak of this system was composed of resonance fluorescence and scattering light. The RRS intensity of the RhB could be enhanced with the addition of D- or L-CA. However, The RRS signal with L-CA had greater degree increased. So a useful assay program for the selective and simultaneous determination of CA enantiomers was built via the RRS signal differences of the two CA enantiomers responding to RhB. The results showing a good linear relationship and high correlation coefficient were obtained, and the detection limit was calculated as 0.086 μg·mL −1 (D-CA) and 0.042 μg·mL −1 (CA). Here, new built RRS method with RhB as chiral probe could be applied to achieve selective analysis through this work. The applicability of the chiral recognition of CA enantiomers mixtures in samples had been demonstrated by its low cost, sensitivity, enantioselectivity, simplicity, and good availability of the materials.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2015
·Vol. 41
·期 12
·10169-10180
·
IF 1.221
Li Changjiang,Xiang Kaiqiang,Liu Yunchang,Zheng Yuchuan,Tian Baozhu,Zhang Jinlong
9-formyl-8-hydroxy-2,3,6,7-tetrahydro-1H, 5H-benzo[ij]-quinolizine rhodamine B hydrazone (FHQRH), a novel colorimetric chemosensor for Cu 2+ , was synthesized by a three-step synthetic route. It was found that FHQRH showed a high selectivity for Cu 2+ ions and excellent anti-interference capability toward other metal ions. The FHQRH solution exhibited a visual color change after the addition of Cu 2+ , owing to the open spirocyclic structure via coordination with Cu 2+ . The complexation coefficient of FHQRH toward Cu 2+ was measured to be 1:1. Furthermore, this Cu 2+ chemosensor has a remarkable low detection limit of 0.45 μM, which is 2 % of the toxic level (20 μM) in drinking water as defined by the US Environment Protection Agency (EPA).
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APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Penghui Shao,Jiayu Tian,Zhiwei Zhao,Wenxin Shi,Shanshan Gao,Fuyi Cui
Visible light photocatalytic activity of amorphous TiO 2 doped with carbon is prepared by a facile sol-gel route for the first time. The most active sample with mesostructure of amorphous phase, high surface area (273 m 2 g −1 ) and large pore volume (0.33 cm 3 g −1 ) is identified by X-ray diffractometer, Raman spectrometer, transmission electron microscope and N 2 adsorption–desorption isotherms. In addition, the most active sample is characterized by Fourier transform-infrared spectrometer, X-ray photoelectron spectrometer, UV–vis diffuse reflectance spectrometer and luminescence spectrometer. The results show that the most active sample with oxygenic groups has a narrower bandgap and lower recombination of electron–hole, due to the carbon doping and phase of amorphous. Effective photodegradation capability and stability of rhodamine B and colorless 4-chlorophenol are verified by photocatalytic tests under visible light irradiation. A possible mechanism of amorphous TiO 2 doped with carbon for visible light photocatalysis is proposed. The findings of this paper will provide new insights to design visible light-induced photocatalyst based on amorphous TiO 2 for organic removal.
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CHEMICAL ENGINEERING JOURNAL
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2013
·
IF 3.473
Fei Ji,Chaolin Li,Xiyu Wei,Jie Yu
Porous Fe 2 O 3 particle was synthesized by the hydrothermal-calcination method and then used to activate peroxymonosulfate (PMS) for Rhodamine B (RhB) decolorization. Several analytical means such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and N 2 physisorption were used to determine the characteristics of the catalyst particles. The results of experiments indicated that the catalyst showed a high activity in decolorization of RhB in the presence of PMS. Several key parameters including initial pH, amounts of catalyst, PMS concentration, and temperature were investigated in order to understand their effect on the decolorization efficiency. Furthermore, the catalyst showed good reusability and stability after three recycles. Finally, the free radicals participating in the process were classified by radical quenching studies, and a rational mechanism was proposed based on the results obtained to understand the catalytic process.
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