Surfaces and Interfaces
·
2023
·
IF 6.2
Yijun Wang,Meijuan Ding,Ziyu Li,Mei Li
To facilitate the realize high-value utilization of coal tar pitch, carbon quantum dots (CQDs) were synthesized using ball-milling-assisted H₂O₂ oxidation method with tar pitch as carbon source. Subsequently, Ag₃PO₄/g-C₃N₄/CQDs composites were prepared through the electrostatic self-attraction of CQDs, Ag₃PO₄ and g-C₃N₄. These composites were then employed for the photocatalytic degradation of dyes, including methyl orange (MO), methylene blue (MB) and rhodamine B (RhB). A case study of MO, the degradation rate constant of Ag₃PO₄/g-C₃N₄/CQDs reached 0.02469 min −1 , which was 11 times and 1.6 times higher than that of g-C₃N₄ and Ag₃PO₄. It found that Ag₃PO₄:g-C₃N₄ mass ratio of 1:1 and 5 mg/L CQDs solution loading were optimal. Characterization analysis revealed the specific surface area of the catalyst was increased and optimized band gap structure after the combination of CQDs as the co-catalyst. The possible reaction mechanism was also expounded, Ag₃PO₄/g-C₃N₄/CQDs constructed Z-scheme heterostructure, with CQDs as electron bridge. In addition, the impact of catalyst mass, initial concentration, and pH on the degradation process was studied, as well as the cyclic stability of the catalyst. Based on capture and ESR tests, the main active substances involved in the reaction were in the following order: h + > ·OH > ·O 2 − . These experiments provided a new idea on the application of coal-based CQDs in the field of visible light catalytic degradation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Changwang Yan,Jing Zou,Li He,Wanhui Jin,Qian Yu,Jing Yu,Zhong Zhao,Guangming Cai,Deshan Cheng,Xin Wang
Inorganic photocatalysts with excellent photocatalytic reactivity have significant potential for wastewater treatment . In this study, using sodium copper chlorophyllin (SCC) as a copper source, Cu atoms were incorporated into the center cavities of g-C 3 N 4 nanosheets by hydrothermal-calcination combined processes. Cu atoms doping led to a narrower optic band gap and the dramatic improvement in photocurrent response as well as corresponding declines in the intensity of electrochemical impedance spectroscopy (EIS) and photoluminescence (PL) spectra. Consequently, the photocatalytic property the Cu/g-C 3 N 4 was enhanced dramatically as evidenced by a 53.4% increase in the photocatalytic degradation rate of tetracycline . Superoxide ions and hydroxyl radicals were found to be the main reactive oxygen species (ROS) causing the degradation. The increased photocatalytic capability of Cu/g-C 3 N 4 might be attributed to the increased chance of intersystem crossing in photosensitizing process of Cu/g-C 3 N 4 as well as the lowered adsorption energy required for the adsorption of O 2 to the catalyst. Minor decline in the photocatalytic efficiency of Cu/g-C 3 N 4 was observed while the crystal structure of the Cu/g-C 3 N 4 remained stable after three cycles of tetracycline degradation. These results indicated the good stability of Cu/g-C 3 N 4 and the possibility of recycling the catalyst during the photocatalytic applications.
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Materials Advances
·
2023
·Vol. 4
·期 22
·5585-5593
·
IF 5
Tinglei Wang,Jiayu Xin,Zhen Li,Yong Fan,Yu Wang
Synthesizing highly effective photocatalysts for hydrogen peroxide (H2O2) generation is still a challenge. In this work, the doping of graphite carbon nitride nanosheets with single-atom titanium, using TiCl3 as a precursor, to form single Ti atom-doped graphitic carbon nitride (Ti-SAC/g-C3N4) photocatalysts can efficiently address this challenge. The photocatalytic activity is enhanced by increasing the concentration of titanium to 0.09%, and subsequently decreases with further increases in the concentration of titanium, thus confirming that the concentration of titanium atoms can modulate the performance of the single-atom catalysts. Furthermore, an in-depth investigation indicates that the bottom of the conduction band (CB) and the maximum of the valence band (VB) can be controlled by varying the concentration of titanium atoms. A high bottom of the CB is beneficial to increase the photocatalytic efficiency. Under acidic conditions and utilizing sacrificial agents, the H2O2 production rate of Ti-C3N4-100 can reach 356.45 μmol L−1 h−1 and is 2.44 and 2.13 times higher than that of BCN and g-C3N4, respectively. The electron spin resonance (ESR) spectra suggest that the generation of superoxide radicals is crucial in the photocatalytic process. This work provides a distinctive strategy to realize single titanium atom doping and offers new insights into structure–property relationships.
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CELLULOSE
·
2021
·Vol. 28
·期 9
·5911-5922
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IF 5.044
Zhang Wen,Liu Yang,Song Dengpeng,Guo Heng,Hu Jinbang,Wang Yunli,Xu Weilin
Traditional cotton fiber dyeing requires an abundance of salt, which leads to environmental pollution. Consequently, decreasing or eliminating the use of salt has become the primary focus of current research. In this study, Crocein Orange G was used to dye carboxymethyl cotton. Carboxymethyl cotton has better color shades than raw cotton and it is used along with a mordant in a simultaneous-mordant dyeing process, at a pH of 7, Al 2 (SO 4 ) 3 ·18H 2 O as the mordant. In addition, it was found that the adsorption kinetics of carboxymethyl cotton followed a pseudo-second-order kinetic model. The equilibrium adsorption capacity increased as the temperature increased from 30 to 50 °C, and the maximum equilibrium adsorption was 8.21 mg g −1 at 50 °C. Furthermore, the adsorption isotherm data exhibited good agreement with the Freundlich isotherm. These results will help achieve salt-free dyeing of cotton fabric in the textile industry.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Songtao Zhong,Hui Zhou,Ming Shen,Yufeng Yao,Qiang Gao
It is vital for environment purification to design and prepare an artificial photocatalyst that can effectively separate photogenerated carriers and maintain the redox ability of system. In this paper, a g-C 3 N 4 /BiOI/Bi 2 O 2 CO 3 photocatalyst was rationally designed and successfully prepared via two-step in-situ transforming process. The results of X-ray diffraction, Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, scanning electron microscopy, energy dispersive X-ray analysis, and transmission electron microscopy confirm the successful synthesis of ternary g-C 3 N 4 /BiOI/Bi 2 O 2 CO 3 catalysts. The photocatalytic activities of all catalysts were assessed by the degradation of Rhodamine B (RhB) under simulated sunlight illumination. The g-C 3 N 4 /BiOI/Bi 2 O 2 CO 3 catalysts showed much higher photocatalytic activities than single g-C 3 N 4 , or BiOI and dual g-C 3 N 4 /BiOI. The results of electron spin resonance and active species trapping experiments revealed that h + and • O 2 − were responsible for the photodegradation of RhB, and a possible photogenerated carrier transport mechanism was proposed.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
·
IF 5.162
Shuifang Mao,Xiaoli Liu,Wenshui Xia
In this study, chitosan oligosaccharide (COS) was modified by grafting Linalool (Lin) on its backbone to improve its anti-inflammatory activity. By changing the molar ratios of COS to Lin, three different degrees of substitution COS-g-Lin1-3 were prepared. The degrees of substitution of derivatives were 0.65, 0.80 and 1.14 respectively. The structure of COS-g-Lin1-3 were characterized by UV–vis, FT-IR, 1 H NMR and elemental analysis in order to show the COS-g-Lin1-3 successfully synthesized. Besides, the thermal stability , solubility, pH stability as well as crystallinity were also investigated. The results revealed that the derivatives exhibited higher thermal stability and more remarkable anti-inflammatory property against hyaluronidase and collagenase than that of COS. The good biocompatibility made this novel material a promising and effective compound for anti-inflammatory applications.
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JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Zhitao Wu,Le Gao,Jie Wang,Feigang Zhao,Longlong Fan,Dan Hua,Susilo Japip,Jingran Xiao,Xueji Zhang,Shu-Feng Zhou,Guowu Zhan
In this work, we fabricated a series of composite membranes for nanofiltration by filtration-assisted assembly of graphene oxide (GO, with a thickness of ca. 2 nm) and graphitic carbon nitride (g-C 3 N 4 , with a thickness of ca. 5.2 nm) nanosheets with the assistance of glycine as a molecular linker to enhance their interactions. The effects of g-C 3 N 4 and glycine concentrations on the lamellar spacing of GO and membrane performance were subsequently investigated. Interestingly, experimental and characterization results showed that both g-C 3 N 4 and glycine could increase the interlayer spacing of pristine GO membranes, but the former reduced the dimensions of nanochannels while the latter led to enlarged channels. As compared with pristine GO membranes, the composite membranes resulted in faster water transportation without sacrificing solute retention. With further functionalization by introducing hyperbranched polyethyleneimine (HPEI) coating, we demonstrated that an integrated Gly-GO/g-C 3 N 4 membrane ( ca. 116 nm in thickness) exhibited excellent separation performance for various organic dye solutions under different operational conditions (feed concentration, pH, etc.). Long-term stability experiments showed that this membrane yielded 90%–93% dye rejection with only a slight decline in permeance over a 40 h testing period, indicating acceptable stability. The pure water permeance of the Gly-GO/g-C 3 N 4 membrane reached as high as 207 L h −1 m −2 bar −1 . These results indicate that the covalent modification of small molecules can improve the packing of GO nanosheets and lead to outstanding nanofiltration performance which has great potential applications in the field of water purification and separation.
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TALANTA
·
2019
·
IF 4.916
Zhengjie Hu,Ximing Wang,Jianhua Wang,Xuwei Chen
Metal-organic frameworks (MOFs) have been gaining extensive popularity in the field of sample pretreatment due to their designable structures and easy-modifiable surfaces. Herein, zirconium-based MOFs UiO-66-NH 2 is first coated with graphene oxide (GO) layer to enhance the stability, and then grafted with hydrophilic polyethylene glycol (PEG) via amidation reaction to give a product of hydrophilic MOF-based nanomaterial UiO@GO@PEG. The obtained nanoparticles exhibit typical hydrophilic interaction liquid chromatography (HILIC) behavior towards glycoproteins , making itself powerful adsorbent for the extraction of glycoproteins from complex matrices. Under pH 9.0, an adsorption capacity of 139.6 mg g −1 for glycoprotein immunoglobulin G (IgG) is achieved, and the retained IgG could be recovered by 0.5% (m/v) ammonium hydroxide (NH 4 OH) as stripping reagent with a recovery rate of 82.6%. Moreover, the UiO@GO@PEG shows excellent reusability in IgG isolation. The practicability of UiO@GO@PEG is verified by the selective isolation of IgG from human serum, demonstrating the purity of isolated IgG with SDS-PAGE assay.
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RSC Advances
·
2019
·Vol. 9
·期 67
·39076-39081
·
IF 3.049
Chao Lu,Xi Chen
Supercapacitors with high power density and long cycle life have shown great potential in energy storage supply for modern electronic devices. Among the component parts of supercapacitors, electrode materials with high electrical conductivity, large surface area and porosity are critical to the energy storage performances of devices. Here, we report a porous g-C3N4 covered MOF-derived nanocarbon material with large specific surface area and high nitrogen doping level as an electrode material for supercapacitors. The large surface area provides high capacity for ion accommodation during electrochemical processes, and the high nitrogen doping facilitates electron and ion transport with extra pseudocapacitance. The supercapacitor based on the as-synthesized material delivers a high specific capacity of 106 F g−1 at current density of 1 A g−1 as well as good rate capability. Furthermore, the device presents good cycling stability with capacitance retention of 91% even after 10 000 cycles at 1 A g−1 under 0.8 V. This study presents a new insight into the design of nanocomposite materials with high energy storage capability and will accelerate the practical application of supercapacitors in future.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 1
·667-676
·
IF 2.195
Zhang Qi,Liu Miao,Liu Shujie,Qiao Liang,Hu Xiaoying,Tian Hongwei
BiVO 4 is known for its ability to decompose water under visible light irradiation. However, BiVO 4 overall suffers from rapid recombination of photogenerated carriers, low photochemical conversion efficiency, low specific surface area, poor conductivity, and weak adsorption capacity of dye. These features limited its application in photocatalysis. In this work, ternary Z-scheme g-C 3 N 4 /RGO/BiVO 4 nanocomposites were successfully fabricated by in situ electrostatic adsorption of g-C 3 N 4 sheets on RGO/BiVO 4 surface using hydrothermal and thermal oxidations processes. The ternary Z-scheme g-C 3 N 4 /RGO/BiVO 4 nanocomposites were then tested for photodegradation of Rhodamine B. The introduction of graphene into direct Z-scheme g-C 3 N 4 /BiVO 4 nanocomposites as an electronic accelerator efficiently enhanced the photocatalytic properties. The as-prepared g-C 3 N 4 /RGO/BiVO 4 composites exhibited optimal visible light responses with significantly improved photocatalytic performances toward degradation of Rhodamine B. The degradation efficiency using ternary photocatalyst reached 100% after 20 min of irradiation time. The reaction rate constant was estimated to 1.537, which was almost 29- and 20-folds higher than those of pure g-C 3 N 4 and binary g-C 3 N 4 /BiVO 4 , respectively. The synergistic effect between BiVO 4 , RGO and g-C 3 N 4 yielded g-C 3 N 4 /RGO/BiVO 4 composites with Z-scheme charge transfer mechanism, promoting rapid separation and slow recombination of photogenerated electron–hole pairs with strong photocatalytic activity. Overall, these findings look promising for design of future Z-scheme photocatalysts for environmental degradation of organic dyes.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 17
·6683-6687
·
IF 3.069
Xiaohui Sun,Xianghui An,Sa Zhang,Zhongtao Li,Jing Zhang,Wenting Wu,Mingbo Wu
Modified g-C3N4 sheets (CNS) with a bandgap of 2.61 eV were fabricated through physical vapor deposition (PVD) of g-C3N4. During the PVD process, a series of gaseous derivatives derived from pristine g-C3N4 at 700 °C condense into CNS at low temperature (<400 °C). As a result, CNS still retains a typical semiconductor structure (bandgap of 2.61 eV), while at the same time, CN and O–H defect groups were introduced to its tri-s-triazine-based structure.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Quan-Quan Zhuang,Hao-Hua Deng,Shao-Bin He,Hua-Ping Peng,Zhen Lin,Xing-Hua Xia,Wei Chen
Few-atom gold nanoclusters (AuNCs) have been fabricated and used for various fields owing to their remarkable optical and photophysical features. However, the rational design for the antibody-mediated synthesis of fluorescent AuNCs for direct antigen–antibody reactions remains unexplored. In this work, immunoglobulin G (IgG)-functionalized AuNCs (IgG-AuNCs) were successfully prepared via a facile and fast biomineralization process. The generated IgG-AuNCs can emit intense red fluorescence with a high photoluminescence quantum yield. Besides strong emission, the bioactivity of IgG on the IgG-AuNCs can be retained. Surface plasmon resonance measurements suggested that IgG-AuNCs can bind to goat anti-human IgG with an affinity constant of 6.21 × 10–8 M. A simple detection method was then developed using a dot-blot immunoassay with IgG-AuNCs as fluorescent tags. Experimental results confirmed that the IgG-AuNC-based fluorescent reporters had many advantages such as low nonspecific adsorption and good photostability, offering immense potential for the development of efficient biosensors. This work can be extended to other specific antibodies to produce multifunctional AuNCs and utilized to detect and monitor targeted analytes and biological events of interest.
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