APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xianlong Zhang,Dong An,Dexin Feng,Fengbing Liang,Zhen Chen,Weimin Liu,Zhenzhen Yang,Mo Xian
Herein, in situ surfactant-free synthesis of ultrathin BiOCl/g-C 3 N 4 (BOC/CN) nanosheets for enhanced visible-light photodegradation of rhodamine B was described. The formation procedure, microstructural morphology, structure, optical properties , and photocatalytic activity were researched in detail. The results show that ultrathin BOC/CN heterojunctions nanosheets were successfully constructed via one-step surfactant-free solvothermal method by introducing CN into the synthesis system of BOC, and the thickness of BOC/CN nanosheets was ~3.5 nm. The ultrathin 2D/2D BOC/CN heterojunctions significantly enhanced the photodegradation of RhB dye under visible-light irradiation. The best-performing sample BOC/CN-60 had 3.9 and 12.8 times higher photocatalytic efficiency for visible-light RhB removal compared to pure BOC and CN, respectively. The large enhancement in the photodegradation activity should be attributed to the synergistic effect of BOC and CN in BOC/CN nanosheets. The synergism reflects in the widened optical window for effective light absorption , enlarged interfacial area for more efficient electron-hole separation, and a shorter diffusion distance for facilitated charge transfer. A possible visible-light RhB photodegradation mechanism was proposed, based on theoretical analysis and active species trapping experiments.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Hongwei Luo,Yaoyao Zhao,Dongqin He,Qing Ji,Ying Cheng,Daoyong Zhang,Xiangliang Pan
Fe@Fe 2 O 3 core-shell nanowire is a promising heterogeneous Fenton iron catalyst to degrade organic pollutants. So far, the roles of hydroxylamine (HA) in Fe@Fe 2 O 3 /HA system for pollutant degradation still remain unknown. In this study, the HA-facilitated degradation of rhodamine B (RhB) and p-nitrophenol (PNP) by Fe@Fe 2 O 3 was reported and the underlying mechanisms were explored. Results show that addition of HA significantly enhanced degradation of organic pollutants and a higher HA dosage caused a faster degradation rate . The degradation process was completely inhibited by scavengers, indicating the hydroxyl radical (HO ) from bulk solution dominated the reactions. HA in the Fe@Fe 2 O 3 /H 2 O 2 /HA system was highly efficient to promote the generation of HO by accelerating both the Fe 3+ /Fe 2+ cycle and the H 2 O 2 decomposition. Meanwhile, HA itself was rapidly decomposed along with the pollutants degradation. About 50.5% of RhB and 46.4% of PNP were mineralized in the presence of HA. The effective pH value for degradation was expanded from 4.0 to 5.0. The EE/O calculations demonstrate that a higher energy input for PNP was required than that for RhB. This study will shed lights on the reactivity of the Fe@Fe 2 O 3 /HA system and provide an alternative pathway for removal of organic contaminants.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Peng Zhou,Wenshu Li,Jing Zhang,Gucheng Zhang,Xin Cheng,Yang Liu,Xiaowei Huo,Yongli Zhang
Rhodamine B (RhB) removal in a tungsten species-catalyzed Fenton-like system using nanoscale zero valent tungsten (nZVW) was investigated. The nZVW system can effective remove RhB in oxygenated water, and the nZVW/H 2 O 2 system significantly enhances the RhB removal. Mechanism investigation shows that hydroxyl radical (·OH) is the primary reactive oxidant for removing RhB in both systems. The stepwise oxidation of nZVW can release reactive tungsten species and produce H 2 O 2 by electron transfer from W 0 or low valent tungsten species to O 2 , and ·OH was then formed via a Fenton-like reaction between low valent tungsten species and H 2 O 2 . The addition of H 2 O 2 in the nZVW/H 2 O 2 system can increase the RhB removal ratio by accelerating nZVW corrosion and enhancing the Fenton-like reaction. Moreover, higher pH inhibits the RhB removal due to the consumption of reactive tungsten species by OH − , and both higher nZVW and H 2 O 2 dosages can enhance the RhB removal. RhB degradation pathways in the nZVW/H 2 O 2 system are proposed involving N-de-ethylation, chromophore cleavage, ring open, and mineralization. In addition, the present study puts forward a new water treatment technique and contributes to understand the role of tungsten species in advanced oxidation processes.
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 30
·3837-3843
·
IF 2.378
Lili Xu,Hongbo Suo,Jianling Wang,Feixiang Cheng,Houmei Liu,Hongdeng Qiu
A novel magnetic graphene oxide modified with Au nanoparticles (Fe3O4@CS/GO/Au) as an efficient adsorbent was prepared for the detection of rhodamine B (RB) coupled with fluorescence spectrophotometry. The as-prepared Fe3O4@CS/GO/Au was characterized by using a field emission scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS), and vibrating sample magnetometer (VSM). The main parameters, which affect extraction and desorption efficiencies, were systematically investigated and optimized. Under the optimal conditions, good linearities (0.1–6.0 μg L−1) with R2 = 0.9990, LODs (0.03 μg L−1) and LOQs (0.1 μg L−1) were achieved. Compared with chitosan-coated magnetic nanoparticles (Fe3O4@CS) and graphene oxide-modified Fe3O4@CS (Fe3O4@CS/GO), Fe3O4@CS/GO/Au exhibited optimal extraction efficiency. To demonstrate the application potency of Fe3O4@CS/GO/Au, it was successfully applied to isolate and extract RB from tap water, waste water, soft drink and eye shadow and the spiked recoveries were between 94.51% and 101.24% with RSD values from 1.95% to 6.15%. It was confirmed this novel method was an efficient pretreatment and enrichment procedure and could be successfully applied for the extraction and determination of trace RB in complex matrices.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2018
·Vol. 72
·期 9
·2327-2337
·
IF 0.963
Xu Jing,Zhao Lele,Hou Wenlong,Guo Huiyun,Zhang Haiquan
The photocatalytic activity of thin film mainly depended on the morphology of thin film and lifetime of photo-generated charges. Here, we reported the effect of morphology adjusted through solvent vapor treatment (SVT) and different substrates on the photocatalytic activity of iron phthalocyanine (FePc) thin films. The FePc thin films on indium tin oxide (ITO) glass, copper (Cu), and quartz glass were prepared by vacuum evaporation, and their morphologies untreated and treated with solvent vapor such as benzene, petroleum ether, N,N -dimethylformamide for different time intervals; time intervals (0, 24, 36, 48, 72 h) were characterized by ultraviolet–visible spectroscopy, field-emission scanning electron microscopy, and X-ray diffractometer. The effects of thickness and substrate on photocatalytic activity of the FePc thin film were characterized accordingly. SVT could effectively adjust morphology (nanorods and nanosheets) of the FePc thin film and improve its photocatalytic activity for Rhodamine B (RhB) degradation under visible light irradiation. In addition, the thickness (10, 20, and 50 nm) and substrate (ITO, Cu, Quartz glass) of the FePc thin film also affected its photocatalytic activity. The degradation rate of RhB with the optimized FePc thin film on ITO substrate was reached 70.0%. We proposed that the morphology treated by SVT could increase the active sites of the FePc thin film and further improve its photocatalytic activity. The thickness and substrate of the FePc thin film were also discussed.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Ge Ma,Junlin Lu,Qingguo Meng,Haiqin Lv,Lingling Shui,Yongguang Zhang,Mingliang Jin,Zhihong Chen,Mingzhe Yuan,Richard Nötzel,Xin Wang,Chuanyi Wang,Jun-Ming Liu,Guofu Zhou
In this work, a series of efficient visible-light-driven WO 3 /Cu (II) nanofiber photocatalysts, with superior photocatalytic activities for the degradation of dyes and aniline, were prepared by electrospinning and impregnation methods. The impregnation method brought about homogeneous distribution of Cu (II) species on the surface of WO 3 nanofibers. The prepared WO 3 /Cu (II) nanofiber photocatalysts exhibited enhanced visible-light absorption and reduced charge recombination, as compared to pure WO 3 nanofibers, due to the interfacial charge transfer (IFCT) effect between the Cu (II) species and WO 3 . The combined benefits of the grafting Cu (II) species on the surface of WO 3 , in terms of optical, surface, and texture properties, led to a significant improvement in the photocatalytic activity for the degradation of Rhodamine B (Rh B) and aniline under conditions of visible light irradiation. Upon the irradiation with visible light in the presence of WO 3 /Cu (II)-2% photocatalyst, the concentration of Rhodamine B (Rh B) decreased from 10 mg/L to 1.5 mg/L, and that of aniline solution decreased from 5 mg/L to 0.728 mg/L over a period of 3 h. And after running five cycles, the concentration of aniline solution could decrease from 5 mg/L to 0.89 mg/L by WO 3 /Cu (II)-2% photocatalyst.
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2013
·
IF 3.532
Zhengping Dong,Xin Tian,Yuanzhe Chen,Jingran Hou,Yueping Guo,Jian Sun,Jiantai Ma
A novel and simple fluorescent chemosensor based on rhodamine (R-2) is designed and synthesized to detect Hg 2+ . Probe R-2 exhibits high selectivity and sensitivity for sensing Hg 2+ with a detection limit at 10 −8 M level, and displays a significant color change from colorless to pink color in the presence of Hg 2+ . About a 400-fold increase in fluorescence emission intensity is observed upon binding excess Hg 2+ in 50% H 2 O/CH 3 CN HEPES buffer at pH 7.00. The titration results show a 1:1 complex formation between R-2 and Hg 2+ . The reversibility of chemosensor R-2 is verified through its spectral response toward Hg 2+ and I − titration experiments. Using Hg 2+ and I − as chemical inputs and the fluorescence intensity signal as outputs, R-2 can be utilized as an INHIBIT logic gate at molecular level.
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 12
·3085-3093
·
IF 2.41
Huang Haibin,Chen Qinhui,He Junhui,Zheng Longhui,Chen Baoling,Lin Jinhuo
Janus materials with anisotropic chemical structures and physical properties have attracted increasing attention due to their diversified potential applications. In this paper, titanium dioxide/3-(trimethoxysilyl) propylmethacrylate (TiO 2 /MPS) was obtained by swelling assisted with extrusion of PS@TiO 2 . Then, the phenolic resin (PF) was coated on the surface of MPS lobe. Finally, TiO 2 /C Janus composite particles were obtained by sintering at the atmosphere of nitrogen. The middle objects during reactive process and the final product were systematically characterized. Results showed that the Janus porous particles of TiO 2 /C were snowman-like structure, in which the average diameter of the carbon lobe was 178 nm and that of TiO 2 lobe was 226 nm. When used as photocatalysts for Rhodamine B degradation in aqueous solution under UV irradiation, the resulted Janus product exhibited more efficient photocatalytic activity than TiO 2 hollow microspheres.
Schematic illustration of swelling polymerization approach to synthesize TiO 2 /C Janus composite particles and its photocatalytic activity for the degradation of rhodamine B
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 14
·7568-7574
·
IF 7.443
Fang Liao,Xun Song,Siwei Yang,Chenyao Hu,Lin He,Shuai Yan,Guqiao Ding
We demonstrate a new semiconducting polymer dot: the poly(o-phenylenediamine)–Rhodamine B copolymer dot (Pp–RhB dot), which emits in the red wavelength range. The Pp–RhB dots can be used as an ultrasensitive fluorescence probe for NO2−in vivo and show high selectivity and ultrasensitivity (detection limit: 2.0 × 10−11 M) for NO2−. The fluorescence of Pp–RhB dots is decreased (φ = 0.014) as a result of fast photoinduced electron transfer (PET) between the modulator (poly(o-phenylenediamine)) and the transducer (RhB), but the N–NO2 bonding mode prevents PET, causing the fluorescence emission to be enhanced (φ = 0.92). This probe effectively avoids the influence of auto-fluorescence in biological systems and gave positive results when tested in both aqueous solution and living cells.
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2014
·
IF 3.259
Ping Qi,Zhihao Lin,Jiaxu Li,ChengLong Wang,WeiWei Meng,Hong Hong,Xuewu Zhang
In this work, a simple, rapid and sensitive analytical method for the determination of rhodamine B in chili-containing foodstuffs is described. The dye is extracted from samples with methanol and analysed without further cleanup procedure by high-performance liquid chromatography (HPLC) coupled to fluorescence detection (FLD). The influence of matrix fluorescent compounds (capsaicin and dihydrocapsaicin) on the analysis was overcome by the optimisation of mobile-phase composition. The limit of determination (LOD) and limit of quantification (LOQ) were 3.7 and 10 μg/kg, respectively. Validation data show a good repeatability and within-lab reproducibility with relative standard deviations <10%. The overall recoveries are in the range of 98–103% in chili powder and in the range of 87–100% in chili oil depending on the concentration of rhodamine B in foodstuffs. This method is suitable for the routine analysis of rhodamine B due to its sensitivity, simplicity, reasonable time and cost.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2016
·
IF 2.687
Zerong Long,Weiwei Xu,Yi Lu,Hongdeng Qiu
1 A new and facile rhodamine B (RhB)-imprinted polymer nanoshell coating for SiO 2 nanoparticles was readily prepared by a combination of silica gel modification and molecular surface imprinting. The RhB-imprinted polymers (RhB-MIPs) were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and UV–vis spectroscopy; the binding properties and selectivity of these MIPs were investigated in detail. The uniformly imprinted nanoparticles displayed a rather thin shell thickness (23 nm) with highly effective recognition sites, showing homogenous distribution and monolayer adsorption. The maximum MIP adsorption capacity ( Q m ) was as high as 45.2 mg g −1 , with an adsorption equilibrium time of about 15 min at ambient temperature. Dynamic rebinding experiments showed that chemical adsorption is crucial for RhB binding to RhB-MIPs. The adsorption isotherm for RhB-MIPs binding could also be described by the Langmuir equation at different temperatures and pH values. Increasing temperature led to an enhanced Q m , a decreased dissociation constant ( K' d ), and a more negative free energy (Δ G ), indicating that adsorption is favored at higher temperatures. Moreover, the adsorption capacity of RhB was remarkably affected by pH. At pH > 7, the adsorption of RhB was driven by hydrogen bonding interactions, while at pH < 7 electrostatic forces were dominant. Additionally, the MIPs also showed specific recognition of RhB from the standard mixture solution containing five structurally analogs. This method was also successfully employed to determine RhB content in red wine and beverages using three levels of spiking, with recoveries in the range of 91.6–93.1% and relative standard deviations lower than 4.1%.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Ruirui Hao,Guohong Wang,Chuanjia Jiang,Hua Tang,Qingchuan Xu
Semiconductor-based photocatalysis is a promising method for degradation of environmental pollutants, but the activity of most widely used photocatalysts such as titania (TiO 2 ) is still unsatisfactory under visible light. Herein, we synthesized a highly efficient visible-light-responsive heterojunction catalysts based on graphitic carbon nitride (g-C 3 N 4 ) and TiO 2 . The g-C 3 N 4 /TiO 2 heterojunction composites with high specific surface area were prepared via in situ hydrothermal synthesis followed by calcination , using titanium tetrachloride (TiCl 4 ) and melamine as precursors. Interesting, HCl from the hydrolysis of TiCl 4 served as the proton source to acidify the melamine. The g-C 3 N 4 /TiO 2 heterojunction composites exhibited higher photocatalytic performance for decomposition of Rhodamine B (RhB) than pure g-C 3 N 4 or TiO 2 under visible light irradiation. The high activity can be ascribed to the high specific surface area (up to 115.6 m 2 g −1 ) of the g-C 3 N 4 /TiO 2 composites and a synergistic heterojunction structure between TiO 2 and g-C 3 N 4 . Moreover, the photocatalytic performances of the g-C 3 N 4 /TiO 2 composites rely on the content of melamine in the synthesis precursors: with an optimum melamine content (3 g for 0.5 mL of TiCl 4 ), the sample showed the highest photocatalytic performance, which is superior to pure TiO 2 and g-C 3 N 4 by a factor of 18.7 and 3.5, respectively. Active species trapping experiments revealed that superoxide radicals and photogenerated holes played crucial roles in the photocatalytic reactions. The results will provide new ideas for the smart design and development of g-C 3 N 4 -based highly active photocatalysts with ultrahigh specific surface area for environmental and energy applications.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）