JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Chi Zhang,Wei Xiong,Yi Li,Li Lin,Xinyi Zhou,Xinyan Xiong
Viruses transmitted by water have raised considerable concerns for public health. A novel memory photocatalyst of g-C 3 N 4 /WO 3 /biochar was successfully developed for effective inactivation of human adenoviruses (HAdVs) in water, in which WO 3 as an electron-storage reservoir and biochar as an electron shuttle is employed to synergistically improve photocatalytic activity of g-C 3 N 4 . The tertiary composite exhibited continuous photocatalytic performance for HAdVs inactivation without regrowth in water under light-dark cycles, i.e., ∼3.9-log inactivation under 6-h visible light irradiation and an additional ∼1.1-log inactivation under the following 6-h dark. The enhanced virucidal mechanism was attributed to the heterojunction formation and especially the electron-transfer pathway switching via biochar incorporation, contributing to electron transfer and storage in the light phase and then electron release in the dark phase, along with obviously increased generation of the virus-killing •OH radicals under light-dark cycles.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
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IF 4.383
Jie Zhou,Beibei Zhu
Dimensional regulation and heterostructure building strategy are the significant means to boost the property of semiconductor photocatalysts . Herein, CeO 2 /g-C 3 N 4 (CeCN) composites with 1D/3D structure were synthesized by compounding one-dimensional CeO 2 nanorods and three-dimensional porous carbon nitride materials. Diverse characterization methods, BET, XRD , SEM/TEM, FT-IR, XPS and UV–vis DRS , to name a few, were conducted to reveal the surface area, micro shape, crystal structure, surface functional groups and photoconductive properties of the samples. The photocatalytic properties of catalyst were estimated by photodegradation of ciprofloxacin (CIP) under visible light irradiation. The results suggested that CeO 2 nanorods with 1D structure and g-C 3 N 4 with 3D porous structure are successfully composite into 1D/3D composites without any crystal structure and surface functional groups changed. The optimal CeCN25 exhibited brilliant photodegradation performance with 96.3% degradation efficiency within 100 min under visible light irradiation. The dimension control strategy made the material form porous structure and increases the adsorption performance of the material, while the heterostructure construction strategy formed a space electric field with efficient charge separation and transfer, which prolonged charge life. The combination of two strategies was the crucial factor for the eminent catalytic activity of photocatalysts. This work supplies thinking for the directional design and synthesis of composite catalysts with high photocatalytic activity .
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Jiahao Ren,Siqi Huo,Guobo Huang,Tianle Wang,Jiabing Feng,Wei Chen,Shenwei Xiao,Pingan Song
The ubiquitous application of highly flammable acrylonitrile–butadienestyrene (ABS) resin has brought great fire threat to human and environment. Unfortunately, current flame retardants often improve flame retardancy but reduce mechanical and thermal properties, seriously affecting their practical application. We herein reported novel multifunctional, high-efficiency, phosphorus and nickel co-doped graphitic carbon nitride (Ni-P-C 3 N 4 ) nanoflakes to address the trade-off between flame retardancy and mechanical/thermal properties. The addition of 2.0wt% of Ni-P-C 3 N 4 increased the initial degradation temperature and tensile strength of ABS composite (ABS/Ni-P-CN2) by 15 °C and 24.3% relative to virgin ABS, indicating its positive effect on thermal and mechanical properties. Compared with ABS, ABS/Ni-P-CN2 exhibited a notable increase in time to ignition, along with 32.4% and 33.8% reductions in peak heat release rate (PHRR) and peak smoke production rate (PSPR), demonstrating excellent anti-ignition, flame-retardant and smoke-suppressive performances. The increased fire safety was mainly due to the physical barrier effect of g-C 3 N 4 nanosheets and the catalytic charring effect of P and Ni. This work offers a novel design strategy to create multifunctional flame retardants for fabricating fire-safe polymer composites with superior thermal and mechanical properties, holding great potential in industries.
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Journal of Environmental Sciences
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2022
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IF 6.796
Zongyang Ya,Qiyou Wang,Jingjin Cai,Peng Wang,Xinyu Jiang,Zhiyin Cai,Shanglin Xiang,Tingwei Wang,Dongyu Cai
It remains as a challenge for realizing efficient photo-responsive catalysts towards large-scale degradation of organic pollutants under natural sunlight. This work reports a new pore engineering strategy for creating ultra-porous g-C 3 N 4 micro-tubes with an unprecedentedly high specific surface area of 152.96 m 2 /g. This is mainly associated with releasing internal vapor pressure in the autoclave where the hydrothermal treatment of the urea/melamine mixture is processed. Supported by microscopic observation, porosity measurement and spectroscopic characterization, it is found that releasing the pressure at halfway of hydrothermal process is vital for forming exfoliated rod-like precursors and the de-aggregation of these rods presents substantial benefits on the production of mesopores on g-C 3 N 4 micro-tubes during the calcination of precursors. This offers a large number of reactive sites required by photocatalytic reaction. Coupling these micro-tubes with Ti 3 C 2 T X nanosheets via electrostatic interaction yields a 1D/2D heterojunction with a close interfacial contact. The addition of metallically conductive Ti 3 C 2 T X nanosheets accelerates the separation between electrons and holes, and also enhances the light absorption . All these merits of structural design lead to forming a group of highly efficient catalysts demonstrating an excellent photocatalytic degradation rate of k = 0.0560 min −1 for RhB dyes under 100 mW/cm 2 visible light radiation that micks sunlight outdoors. This laboratory valuation is further supported by an outdoor test that shows a fast degradation rate of 0.0744 min −1 under natural sunlight.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xufei Li,Ting Chen,Yanling Qiu,Zhiliang Zhu,Hua Zhang,Daqiang Yin
The coupling of photocatalysis and peroxymonosulfate (PMS) activation is considered as a promising strategy for the removal of organic pollutants. However, the development of visible-light-excited efficient photocatalysts for PMS activation remains challenging. Herein, a new recyclable dual Z-scheme g-C 3 N 4 /BiVO 4 /CuFe 2 O 4 (CN/BVO/CFO) heterojunction was first fabricated employing a simple hydrothermal approach. The results showed that the photocatalytic degradation behavior of levofloxacin (LEV) by CN/BVO/CFO under visible light illumination was enhanced compared with single BVO, CN, CFO and binary CN/BVO. Moreover, after adding PMS, the removal efficiency of LEV over CN/BVO/CFO/Vis/PMS system reached 96.2% within 60 min, which was 3.5 and 4.3 times higher than that of CN/BVO/CFO/Vis and CN/BVO/CFO/PMS, respectively. Characterization test and mechanism analysis indicated that the improved catalytic activity resulted from the dual Z-scheme heterostructure and the synergistic effect between photocatalysis and PMS activation, making the production of multiple active species. Additionally, CN/BVO/CFO/Vis/PMS system exhibited supreme mineralization ability, low degradation product toxicity and acceptable adaptability to solution pH, coexisting anions and organics. More importantly, the favorable magnetic separation and stability would provide convenience for the potential practical application of CN/BVO/CFO. This research may give a perspective on the design of efficient dual Z-scheme photocatalyst for PMS activation in environmental remediation.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Jiabao Gu,Chaogang Ban,Jiazhi Meng,Qianwen Li,Xuanyu Long,Xiaohan Zhou,Nan Liu,Zequan Li
Rapid recombination of the photogenerated carrier, a limited range of photoexcitation, and unsatisfactory photocatalytic activity are the limiting factors in photocatalytic applications. Accelerating photogenerated carrier transfer and constructing surface active sites have become critical tasks. In this study, a dual Z-scheme UNiMOF/BiVO 4 /S-C 3 N 4 (NBSCN) photocatalyst with a 2D/3D/2D structure was successfully constructed. Under visible-light irradiation, NBSCN outperforms single and binary composites in photocatalytic tetracycline photodegradation and Cr(VI) photoreduction due to the synergistic effect of adsorption and photocatalysis. The maximum photocatalytic efficiency of tetracycline (90.1 %) and Cr(VI) (93.6 %) in 120 min was achieved by NBSCN-20 %. The exceptional photocatalytic activity of NBSCN-20 % can be attributed to the large specific surface area, increased active sites, improved visible-light absorption ranges, and the construction of heterojunctions. The fabricated dual Z-scheme heterojunction at the interface of NBSCN reduces the recombination rate of photogenerated carriers and widens the range of light absorption. NBSCN-20 % exhibits excellent stability in the process of cyclic experiments. On the basis of the results, the feasibility of the dual Z-scheme mechanism is proposed. This work demonstrates that NBSCN-20 % photocatalyst has promising application prospects in removing heavy-metal ions and organic pollutants from aqueous environments.
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MOLECULES
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2022
·Vol. 27
·期 20
·6863
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IF 4.927
Bolin Zhao,Xingzi Zou,Jiahui Liang,Yelin Luo,Xianxi Liang,Yuwei Zhang,Li Niu
Developing excellent strategies to optimize the electrochemiluminescence (ECL) performance of C3N4materials remains a challenge due to the electrode passivation, causing weak and unstable light emission. A strategy of controlling the calcination atmosphere was proposed to improve the ECL performance of C3N4nanotubes. Interestingly, we found that calcination atmosphere played a key role in specific surface area, pore-size and crystallinity of C3N4nanotubes. The C3N4nanotubes prepared in the Air atmosphere (C3N4NT-Air) possess a larger specific surface area, smaller pore-size and better crystallinity, which is crucial to improve ECL properties. Therefore, more C3N4•−excitons could be produced on C3N4NT-Air, reacting with the SO4•−during the electrochemical reaction, which can greatly increase the ECL signal. Furthermore, when C3N4nanotube/K2S2O8system is proposed as a sensing platform, it offers a high sensitivity, and good selectivity for the detection of Cu2+, with a wide linear range of 0.25 nM~1000 nM and a low detection limit of 0.08 nM.Keywords:electrochemiluminescence;C3N4nanotube;Cu2+detection
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Wenyi Ma,Jian Pan,Wanzheng Ren,Long Chen,Lilan Huang,Shanshan Xu,Zhaohui Jiang
Despite membrane separation technology has been extensively implemented in various field, the fouling caused by bacterial and organic dye seriously impair the performance and lifespan of the membrane, the anti-fouling modification of the membrane is still a challenging. In this work, the antibacterial and self-cleaning poly (vinylidene fluoride-chlorotrifluoroethylene) (PVDF-CTFE) mixed matrix membranes were prepared by non-solvent induced phase separation method using self-made graphite carbon nitride nanosheet wrapped copper phosphide (Cu x [email protected] 3 N 4 ) as modification additive. The sequel of the incorporated Cu x [email protected] 3 N 4 nanosheet content on the morphology, pore structure and physicochemical structure of membranes was investigated in terms of pure water flux, anti-fouling and antibacterial properties. The results showed that the addition of Cu x [email protected] 3 N 4 nanosheets not only improved the hydrophilicity and mechanical property of the membranes, but also enabled PVDF-CTFE membrane with the ability of inactivation bacteria and self-cleaning, which significantly enhanced the anti-fouling performance of PVDF-CTFE membrane in complex environment. When the amount of Cu x [email protected] 3 N 4 reached 2 wt%, the mixed matrix membrane possessed outstanding comprehensive performance with the pure water flux of 641.1 L m −2 h −1 , antibacterial rate over 99% and self-cleaning under simulated sunlight, making the mixed matrix membrane a potential choice for wastewater treatment . In conclusion, this study enlightened the fabrication strategy of multifunctional mixed matrix membranes.
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VIBRATIONAL SPECTROSCOPY
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2022
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IF 2.382
Chang Wang,Qingqiang Cui,Tian Yue,Anxin Jiao,Hui Ma,Mengya Zhang,Linqi Zheng,Shuang Li,Guanhua Li,Ming Chen
As for the ultrasensitive diagnosis of biomolecules via surface-enhanced Raman scattering spectroscopy (SERS), the primary requirement is to effectively enhance the activity of nano-substrates. Herein, we report an interesting strategy for further boosting SERS activity by thermal annealing treatment of as-prepared hybrid substrates. Initially, highly dense and monodisperse plasmonic Au nanoparticles (NPs) were loaded on two-dimensional (2D) graphitic carbon nitride (g-C 3 N 4 ) nanosheets . By adopting uric acids (UAs) as probe biomolecules, the g-C 3 N 4 /Au NPs with appropriate ~2.1% Au compositions exhibit much higher Raman signals than that of the hybrids with other Au contents. Besides the enhancement by routinely controlling hybrid components, the further maximizing SERS activity with a ~2.6-fold improvement than the original one can be obtained by thermal annealing of g-C 3 N 4 /Au NPs at 350 ℃ condition. It enables the thermal modified g-C 3 N 4 /Au NPs to be applied for highly sensitive monitoring of UAs in artificial urine. The corresponding detection limit is achieved at the ultralow level of 10 −11 M, which is nearly two orders of magnitude better than that of the unannealed sample. It should be attributed to the stronger synergistic coupling effect by thermal annealing treatment that gives rise to the higher-efficiency photoinduced electron transfer (PIET) between g-C 3 N 4 supports and plasmonic Au NPs. The present work provides a new opportunity for further promoting the SERS activity of prefabricating nano-substrates, holding great potential for practical monitoring of ultra-trace biomolecules in the near future.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Lanxin Xu,Jiali Ma,Dong Chen,Chenjie Gu,Jun Zhou,Tao Jiang
Strapping plasmonic substrate with a reliable ability to anchor molecules and achieve reproducible result provides trustworthy opportunities for flourishing surface-enhanced Raman scattering (SERS) technique. Herein, a facile controllable in-situ anisotropic growth strategy was exploited to anchor gold nanowires (Au NWs) onto two-dimensional g-C 3 N 4 nanosheets (g-C 3 N 4 /Au NWs), facilitating a sensitive and recyclable SERS sensor for gaseous analytes. Benefiting from the attractive enrichment effect of the brush-like surface formed by numerous small Au NWs as well as their rich nanotips-mediated enhancement capability, the hybrid substrate showed an outstanding performance in SERS-based detection of trace 4-Aminothiophenol (4-ATP) molecules, demonstrating a monitoring limitation down to 10 −8 M even in atmosphere. Satisfyingly, under visible light illumination, the efficient green photocatalytic ability derived from the g-C 3 N 4 supporting matrix rendered reusable capability for the substrate, whose SERS signal was kept at a persistent high level throughout 6 cycles. Attributed to the narrow line width of SERS spectrum, the 4-ATP assay under the interference of 2-naphthalenethiol (2-NAT) was acquired in gas phase and the dependable recovery rates from 85.4 to 93.9% were confirmed as well. Thanks to the intriguing features including excellent sensitivity and recyclability, the g-C 3 N 4 /Au NWs substrate proposed here will pave the way toward the potential application of SERS technique in multiplexed gaseous detection.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 23
·18897-18909
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IF 2.779
Pan Yusong,Zheng Wanle,Ou Linjie,Yan Haixian,Huang Run,Pan Chengling
Photo-assisted activation of permonosulfate (PMS) is an effective technology for degradation of organic contaminants. Herein, the cobalt-doped (Co-doped) g-C 3 N 4 photocatalyst was synthesized by the methods of impregnation and calcination. The catalytic activity of Co-doped g-C 3 N 4 catalyst for degradation of RhB in the photo-assisted PMS activation system was obviously higher than that in solo light irradiation or solo PMS-based advanced oxidation processes system. The Co-CN-2 catalyst presents the highest catalytic activity for degradation of RhB in the photo-assisted PMS activation system. 93.5% of RhB was degraded in 10 min by Co-CN-2 catalyst and the kinetic constant of Co-CN-2 catalyst in photo-assisted PMS activation system is 0.267 min −1 , which is 3.71 and 7.36 times to that of Co-CN-2 in solo PMS activation and solo light irradiation system, respectively. The enhanced catalytic activity of Co-CN-2 was mainly attributed to the controllable band structure of g-C 3 N 4 by doping cobalt ions as well as excellent activity of cobalt for PMS activation, and the synergistic interaction between the photo-catalytic and PMS activation plays an important role for degradation of organic pollutants.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Pengwei Jia,Yuanliang Li,Zhanshen Zheng,Yun Liu,Yan Wang,Tong Liu
The improved separation efficiency of photogenerated electrons and holes is an effective way to improve photocatalytic performance. Herein, the high efficiency sheet/fiber g-C 3 N 4 /BaTiO 3 photocatalysts with built-in electric field are successfully synthesized by electrospinning and simple calcination method. Compared with pure g-C 3 N 4 and BaTiO 3 , g-C 3 N 4 /BaTiO 3 heterojunction possesses higher photogenerated electron-hole pairs separation efficiency and larger specific surface area, thus improving the photocatalytic activity of g-C 3 N 4 /BaTiO 3 catalysts. Besides, the ferroelectric polarization produced by external electric field significantly promotes the CO 2 reduction performance of CNBT20 [the component with mass fractions BT / (CN/BT) = 20 %], whose reduction rates of CH 3 OH and CH 3 CH 2 OH are 1.44 and 1.50 times that of unpolarized CNBT20, accompanied with remarkable cyclic stability. The coupling effect of heterojunction and ferroelectric polarization improves the separation efficiency of photoexcited carriers in g-C 3 N 4 /BaTiO 3 significantly, hence providing broad prospects for the combination of traditional semiconductors and ferroelectric materials to improve photocatalytic performance.
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