CHEMICAL ENGINEERING RESEARCH & DESIGN
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2016
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IF 2.525
Xinshan Rong,Fengxian Qiu,Zhongtian Jiang,Jian Rong,Jianming Pan,Tao Zhang,Dongya Yang
In current work, a ternary combined ZnO-Ag 2 O/porous g-C 3 N 4 (ZnO-Ag 2 O/pg-C 3 N 4 ) composite photocatalyst was prepared and used for the degradation of ciprofloxacin (CIP) under visible light irradiation. The structure, surface morphology and chemical composition of as-prepared composite photocatalyst are investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) and Brunauer–Emmett–Teller (BET) methods. From the DRS and PL optical property test, the result indicated that ZnO-Ag 2 O/pg-C 3 N 4 presented relative narrow band gap and higher separation rate of photoinduced charge carriers in the ternary combined system, which was favorable for the photocatalytic activity enhancement under visible light irradiation. Compared with ZnO , porous g-C 3 N 4 , Ag 2 O and ZnO-Ag 2 O, the prepared ZnO-Ag 2 O/pg-C 3 N 4 presents the highest degradation efficiency (97.4%) within 48 min. The degradation intermediates of CIP were detected by HPLC/MS during photocatalytic degradation. Furthermore, porous g-C 3 N 4 as a visible-light-driven photocatalyst used as supporter in the combined system not only improves the degradation efficiency, but also speeds up the reaction rate.
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Small
·
2016
·Vol. 12
·期 39
·5477-5487
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IF 8.315
Zhifang Ma,Mengchao Zhang,Xiaodan Jia,Jing Bai,Yudi Ruan,Chao Wang,Xuping Sun,Xiue Jiang
Local hypoxia in tumors, as well as the short lifetime and limited action region of 1 O 2 , are undesirable impediments for photodynamic therapy (PDT), leading to a greatly reduced effectiveness. To overcome these adversities, a mitochondria-targeting, H 2 O 2 -activatable, and O 2 -evolving PDT nanoplatform is developed based on Fe III -doped two-dimensional C 3 N 4 nanofusiform for highly selective and efficient cancer treatment. The ultrahigh surface area of 2D nanosheets enhances the photosensitizer (PS) loading capacity and the doping of Fe III leads to peroxidase mimetics with excellent catalytic performance towards H 2 O 2 in cancer cells to generate O 2 . As such tumor hypoxia can be overcome and the PDT efficacy is improved, whilst at the same time endowing the PDT theranostic agent with an effective T 1 -weighted in vivo magnetic resonance imaging (MRI) ability. Conjugation with a mitochondria-targeting agent could further increase the sensitivity of cancer cells to 1 O 2 by enhanced mitochondria dysfunction. In vitro and in vivo anticancer studies demonstrate an outstanding therapeutic effectiveness of the developed PDT agent, leading to almost complete destruction of mouse cervical tumor. This development offers an attractive theranostic agent for in vivo MRI and synergistic photodynamic therapy toward clinical applications.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2017
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IF 2.625
Shuang Liang,Yuming Zhou,Wenting Wu,Yiwei Zhang,Zhilan Cai,Jie Pan
After applying for many years, antibiotics, such as chlortetracycline (CTC), have been widely detected in aquatic environment. The persistence and toxicity effect of them ungently calling for better solution. In this study, CuO nanosheet-liked structure has been successfully synthesized through a C 3 N 4 templating method with the presence of benzyl alcohol and sodium citrate by assembling small CuO nanoparticles onto the surface of C 3 N 4 nanosheet . Because of the C 3 N 4 -liked structure, narrowing band gap, enhanced visible light absorption and decreased recombination rate of photogenerated electron-hole pairs, the as-prepared CuO nanosheet-liked structure exhibits an enhanced visible-light photocatalytic activity in the degradation of CTC. Furthermore, Pt nanoparticles with a dimension around 10 nm have been loaded onto the surface of CuO nanosheet-liked structure to enhance the visible-light photoactivity of the photocatalyst. For the first time, the CuO-based photocatalyst can be applied in the photocatalytic degradation of CTC and displays an improved performance while comparing to TiO 2 -based photocatalysts. In particular, nearly 50% concentration of CTC in the solution can be degraded with the presence of Pt/CuO-NS-2 in 120 min. With the synergy effect between H 2 O 2 and Pt/CuO-NS-2, the degradation efficiency and ability of CTC has been further improved. Around 80% of CTC in the solution was degraded in 60 min.
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BIOMATERIALS
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2016
·
IF 8.387
Zhenzhen Wang,Kai Dong,Zhen Liu,Yan Zhang,Zhaowei Chen,Hanjun Sun,Jinsong Ren,Xiaogang Qu
As common reactive oxygen species, H 2 O 2 is widely used for bacterial inactivation and wound disinfection . However, the concentrations used are always higher than physiological levels , which frequently result in potential toxicity to healthy tissue and even delay wound healing. Here we report highly efficient nanozyme hybrids that are capable of activating biologically relevant concentrations of H 2 O 2 for defending bacterial infections. The integration of AuNPs with ultrathin graphitic carbon nitride (g-C 3 N 4 ) provides excellent peroxidase-activity, which can catalyze the decomposition of H 2 O 2 to OH radicals much more efficiently, allowing the use of bio-safety levels of H 2 O 2 for the first time. Furthermore, our system not only exhibits striking bactericidal performance against both DR Gram-negative and DR Gram-positive bacteria, but also shows high efficiency in breaking down the existing DR-biofilms and prevented formation of new biofilms in vitro. More importantly, in vivo experiments indicate that our system could significantly prevent bacterial infections and accelerate the healing rate of wounds.
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高影响因子
CARBON
·
2024
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IF 10.5
Yu Zhang,Jingde Luan,Panpan Li,Longde Jiang,Haibin Yan,Wengang Liu,Zheng Yan
Water-based homogeneous pre-assembly and thermal polycondensation were used to prepare carbon-doped oxygen-bridged layer-twisted graphite carbon nitride (g-C 3 N 4 ) heterojunction for highly efficient photocatalytic hydrogen evolution (PHE). Despite the narrow band gap of around 0.91 eV, g-C 3 N 4 heterojunction exhibited an excellent hydrogen evolution rate (563.87 μmolg −1 h −1 ) in 30 % methanol/water solution without precious metal assisting catalysts, 36.85 times higher than g-C 3 N 4 . C doping in heptazine ring and bridging O caused the adjacent layer of g-C 3 N 4 to twist by 11° in three-dimensional space. Noticeably, carbon doping in triazine ring was favorable to the establishment of build-in electric field between adjacent layers owing to the delocalized large π bonds . Bridging oxygen acted as a conversion switch for electron storage and transport of photogenerated charge from innerlayer (unmodified layer) with high Fermi level to outlayer (modified layer) with low Fermi level. This work provided an insightful guidance to novel layer-twisted g–C 3 N 4 –based photocatalysts for efficient H 2 production.
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Surfaces and Interfaces
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2024
·
IF 5.7
Kuo Yang,Yun Yang,Yifan Jiang,Bingjie Ye,Luowei Li,Wenju Liu,Tong Yan,Wei Li,Shixi Liu
s In this study, a flower-shaped Bi 2 S 3 /g-C 3 N 4 heterostructure was synthesized via a hydrothermal method and utilized as a visible-light-driven photocatalyst for the removal of hexavalent chromium (Cr 6+ ) and Rhodamine B (RhB). Employing an interface electronic engineering strategy with heterostructure nanosheets, the thickness of the nanosheets was adjusted by varying the molecular weight of the structure guiding agent, polyethylene glycol (Mn = 400, 2000 or 4000). Under visible light irradiation for 18 and 60 minutes, the removal efficiencies of Cr 6+ and RhB reached 95.0 % and 99.9 %, respectively, with corresponding rate constants being 8.64-fold and 9.67-fold higher than pure Bi 2 S 3 . The enhanced photocatalytic efficiency may be attributed to the intermediate adsorption states and increased active sites enhancing light absorption and charge separation. Furthermore, species capture studies revealed that electrons (e - ) and superoxide radicals (·O 2 - ) played crucial roles in the reduction of chromium (VI), while holes (h + ) were the primary active species involved in RhB degradation. Density-functional theory (DFT) calculation demonstrated charge redistribution and electron accumulation can be more obviously observed at Bi 2 S 3 /g-C 3 N 4 than Bi 2 S 3 , which proved that g-C 3 N 4 doping effectively improved the electrons transfer efficiency over the Bi 2 S 3 /g-C 3 N 4 surface, thereby enhancing the photocatalytic activity.
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Catalysis Science & Technology
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2017
·Vol. 7
·期 18
·4064-4078
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IF 5.773
Qiang Wang,Shiyou Guan,Bing Li
Two-dimensional (2D) graphitic-C3N4 (g-C3N4) was successfully hybridized with one-dimensional (1D) flux-grown Na-modified K2Ti6O13 nanobelts (Na-K2Ti6O13 NBs) for the first time to construct novel 1D/2D Na-K2Ti6O13/g-C3N4 heterostructured photocatalysts using a facile mixing–calcination method. The heterostructured Na-K2Ti6O13/g-C3N4 composites with three-dimensional (3D) hybrid architectures exhibited a remarkably enhanced photocatalytic efficiency for organic pollutant degradation in comparison with pure Na-K2Ti6O13 and g-C3N4 under both simulated sunlight and visible-light irradiation (λ > 420 nm), which could be mainly attributed to the synergistic effects between Na-K2Ti6O13 and g-C3N4 including more efficient interfacial charge transfer, longer lifetimes and the stronger oxidation and reduction ability of photogenerated charge carriers, fundamentally originating from the formation of Na-K2Ti6O13/g-C3N4 heterojunctions based on the well-matched energy-band structures. Moreover, the Na-K2Ti6O13/g-C3N4 hybrids showed good stability and reusability for the photocatalytic degradation of organic pollutants. Finally, the possible mechanisms responsible for the improved simulated sunlight and visible-light photocatalytic performance were also investigated, respectively, based on the results of PL spectra, time-resolved fluorescence decay spectra, radical species trapping experiments, ESR spectra and PL-TA measurements. Overall, this work will not only be beneficial for the design and development of more efficient visible-light-responsive g-C3N4-based composites for solar energy conversion and environmental remediation but will also be influential in optimizing the visible-light photocatalytic activity of wide-band-gap 1D titanate nanomaterials to meet the requirements of practical applications.
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Journal of Water Process Engineering
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2024
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IF 6.3
Huda D. Abdul kader,Saad H. Ammar,Waqar A. Abdulnabi,Zaid H. Jabbar,Haidar Taofeeq,A. Al-Farraji
The development of new and effective photocatalytic heterojunctions for green environmental remediation under visible-illumination has received great attention in recent years. Herein, we assembled BiVO 4 -decorated S-doped g-C 3 N 4 (BVO/SCN) heterojunctions with different BVO:SCN ratios (5 to 30 wt% BVO) to achieve effective photocatalytic heterojunctions for visible-light-prompted degradation of antibiotic TC in a three-phase split-plate airlift photocatalytic reactor, in which successfully reducing charge recombination rate. Obviously, BVO/SCN endorsed greater photodecomposition performance of TC under visible-light (decompose 95.7 % of TC in 60 min), which compared to SCN was approximately 5-times enhancement. The TC mineralization efficiency of BVO/SCN hybrid (84 % within only 60 min) was higher than that of the individual BVO and SCN. The efficient internal self-mixing generated in the airlift photocatalytic reactor greatly contributed to increasing the TC degradation efficiency by improving the mass transfer and the irradiation process of the mixture, in which the degradation efficiency increased from 88 % without airlift to 95.7 % in airlift reactor. On the other hand, the high degradation efficiency was credited to the extended absorbing of visible-light and great separation of photo-prompted carriers through the formation of Z-type heterojunction between BVO and SCN. As recorded by the trapping investigates, the • O 2 − and • OH radicals act as the main reactive-species in the TC photocatalytic degradation process. Moreover, High durability of the developed BVO/BCN heterojunctions was obtained, in which 89.4 % TC degradation was still recorded after five rounds.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Shuai Ma,Minghao Zhang,Fuxiang Song,Wenhao Yang,Liantao Xin,Caifeng Ding
The electrochemical antifouling sensing interface can effectively resist the adsorption of non-specific biomolecules , which provides a powerful means for the sensitive determination of various biomarkers in complex media. Therefore, the development of simple and efficient antifouling coatings is particularly important. Herein, we utilized tris (2-carboxyethyl) phosphine to rapidly reduce disulfide bonds in bovine serum albumin (BSA) to generate amyloid aggregation (PTB), thus forming a macroscopic two-dimensional film through one-step self-assembly. Compared to other antifouling interfaces, PTB has the advantages of simple preparation means, high stability and reproducibility, as well as good antifouling properties. At the same time, a layer of polyaniline (PANI) was electrodeposited on the modified electrode to improve the electron transmission rate, which improves the detection efficiency of the sensor. Furthermore, g-C 3 N 4 was introduced as an internal standard substance to eliminate instrument errors. According to the ratio of electrochemiluminescence (ECL) signals of [Ru(bpy) 3 ] 2+ and g-C 3 N 4 , a ratiometric sensing strategy was designed to improve detection accuracy and sensitivity. Based on this, the proposed biosensor can achieve sensitive detection of CEA with a detection limit as low as 0.43 fg/mL ( S/N = 3), which has important significance for early clinical diagnosis.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Yunfei Xu,Ying Li,Yongjian Wei,Haiou Liang,Tong Xu,Yinghui Sun,Jie Bai
Photothermal synergistic catalysis of Suzuki-Miyaura coupling reaction not only utilizes the solar energy efficiently, but also reduces the energy consumption. It is a green organic synthesis method for constructing C–C bonds, which has a wide application. In this work, we constructed a PdO/g-C 3 N 4 /TiO 2 bilayer tubular structure material with a heterojunction structure by a simple and effective method. The catalyst exhibited efficient photothermal synergistic catalytic performance in Suzuki coupling reaction under visible light irradiation. The influence of the catalyst’s structure, morphology, composition, and photothermal response on the Suzuki coupling reaction were discussed based on a series of characterizations and activity test of the catalyst. The results showed that the PdO/g-C 3 N 4 /TiO 2 catalyst contained an effective g-C 3 N 4 /TiO 2 heterojunction structure. Under visible illumination, the differences in interfacial charge concentration and electron affinity between these two different types of semiconductors lead to charge rearrangement and transfer, which greatly improves the carrier separation efficiency. Meanwhile, palladium metal exhibits excellent electron deposition effects, both as an active metal center for SMC reactions and as an electron acceptor for facilitating photoelectron transfer. Electron-rich palladium atoms play an important role in C–C bond formation reactions, improving catalytic efficiency. The PdO/g-C 3 N 4 /TiO 2 catalyst has excellent catalytic activity and can catalyze the SMC reaction under visible light and at 0 ℃, the yield reached 85.6%, which is comparable to the activity of thermal catalysis for 15 minutes. Furthermore, after five cycles, the PdO/g-C 3 N 4 /TiO 2 catalyst still maintained an 83.1% yield, demonstrating excellent cycle stability. This article offers an effective strategy for preparing heterojunction catalyst with visible light response for photothermal reaction and presents the potential of these catalysts as a way to improve the efficiency and sustainability of Suzuki coupling reactions.
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Small Methods
·
2024
·
IF 10.7
Bin He,Wanting Zhao,Wenjin Li,Chunlei Wei,Jian Sun
The improvement of photocatalytic activity of g-C 3 N 4 is expected for its advanced applications but remains a challenge due to the limitations of current strategies, such as single function, inefficiency, and uneconomical. Herein, a modified g-C 3 N 4 with improved interface properties is constructed through the modulation of the ionic microenvironment affected by ionic liquids (ILs) and exhibits a 2.3-fold enhanced photodegradation efficiency and a 3.5-fold enhanced reaction rate relative to pristine g-C 3 N 4 . It has demonstrated excellent performance in photo-therapy bacterial-infected wounds. Theoretical calculation indicated that the precursor can be regulated by designing the specific ILs microenvironment to form “ILs-Mel” clusters due to the diversity of interaction energy and electrostatic potential. The cluster results in uneven stress on the 2D plane, further inducing the reconstruction of the microstructure. The synergistic effect of cations and anions of ILs on regulating the interface properties of g-C 3 N 4 due to the change of skeleton structure during thermolysis of ILs. The microstructure, surface, and optical-electrical properties can be adjusted by selecting different cations of ILs, and the custom-made band structure and wettability can be obtained by selecting different anions. This work provides a facile strategy to modulate the interface properties of g-C 3 N 4 by building specific a microenvironment of precursor.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Huayu Wang,Yanhua Cao,Changsheng Guo,Ming Ge
Heterogeneous catalyst/persulfate advanced oxidation process has been widely used in antibiotic wastewater treatment . As-designed MIL-88A(Fe)/g-C 3 N 4 composite catalyst firstly activated peroxydisulfate (PDS) to degrade tetracycline (TC) in this work. Activating PDS by MIL-88A(Fe)/g-C 3 N 4 has a higher efficiency and rate toward TC degradation compared with MIL-88A(Fe) and g-C 3 N 4 . After 60 min, the optimal MIL-88A(Fe)/g-C 3 N 4 -5 activated PDS to degrade about 80% of TC in water. The existence of g-C 3 N 4 increases the specific surface area and active Fe 2+ content of MIL-88(Fe), promotes PDS adsorption and utilization, thus showing an excellent catalytic performance for PDS activation. MIL-88A(Fe)/g-C 3 N 4 activated PDS oxidation process synergistically removed TC by free radicals (O 2 •− , •OH and SO 4 •− ) with non-free radicals ( 1 O 2 ), and the effect of some important operating factors on TC removal, the TC degradation pathways and toxicity of TC intermediates were analyzed. Moreover, the MIL-88A(Fe)/g-C 3 N 4 -5 powdered catalyst was designed into a catalytic membrane, which could remove 96% of TC in a short time (<10 min). The cycle tests confirm that powdered MIL-88A(Fe)/g-C 3 N 4 composite catalyst and its catalytic membrane have a good recyclability and stability, demonstrating that this catalyst possesses a practical application potential in the treatment of TC polluted wastewater.
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