Nano Research
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2021
·Vol. 14
·期 7
·2363-2371
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IF 8.897
Lv Yan,Yue Lin,Khan Imran Mahmood,Zhou You,Cao Wenbo,Niazi Sobia,Wang Zhouping
Herein, we report the fabrication of Fe 3 O 4 @TiO 2 nanosheet/Ag/g-C 3 N 4 (Fe 3 O 4 @ns-TiO 2 /Ag/g-C 3 N 4 ) composite photocatalysts with well-designed hierarchical yolk-shell structure. To endow the composites with fascinating features, multiple functional components are perfectly integrated into the definite structure. The photodegradation experiments of organic pollutants revealed a significant enhancement in photocatalytic activity of developed composites as compared to P25, which is mainly due to the synergetic interaction of the tailored three-dimensional (3D) yolk-shell porous nanostructure, extended sunlight response range, and retarded the recombination probability of photogenerated electrons-holes. More importantly, the hybrid samples exhibited superior magnetic properties due to the magnetic component. The excellent magnetic recyclability and reusability of the photocatalysts are verified by the magnetic hysteresis loop and cyclic photocatalytic degradation experiments, which is significant for the green and sustainable applications of photocatalysts. Considering its remarkable photocatalytic performance and expectant magnetic recyclability, the composite photocatalysts are expected to be a promising candidate to dispose of future environmental issues.
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高影响因子
JOURNAL OF RARE EARTHS
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2021
·
IF 3.712
Jingzhi Dou,Bei Chen,Guixia Liu,Xiangting Dong,Wensheng Yu,Jinxian Wang,Yunxiao Zhang,Zhanguo Li,Jiang Zhu
Photothermal therapy (PTT) has presented its inherent application value in cancer treatment. Nevertheless, single-functional photothermal materials cannot meet the precise diagnosis and treatment of cancer. Therefore, it is important to design a nanocomposite that has both high therapeutic efficiency and multimodal imaging capabilities. In our work, a new nanostructure of gold nanorods (AuNRs) with silver shells decorated by BaGdF 5 :Yb 3+ ,Er 3+ nanoparticle was synthesized by a simple way. The biostability of AuNRs is increased by coating with silver shells, and the AuNR@Ag nanoparticles can be used as excellent surface enhanced Raman scattering (SERS) probe. Moreover, the modification of BaGdF 5 :Yb 3+ ,Er 3+ nanoparticles provides the possibility of real-time optical imaging of the tumor area. Under the irradiation of NIR laser, the AuNR@Ag/BaGdF 5 :Yb 3+ ,Er 3+ nanocomposites (NCs) have strong upconversion emission and excellent photothermal conversion efficiency. Meanwhile, the NCs show low cytotoxicity and good biocompatibility in MTT cytotoxicity test. Moreover, the NCs are also exceptional contrast agents for CT imaging. For in vitro photothermal therapy test, NCs show excellent killing efficiency on tumor cells. Therefore, the multifaceted research of AuNR@Ag/BaGdF 5 :Yb 3+ ,Er 3+ multifunctional nanomaterials provides a break for high-efficiency tumor photothermal therapy and multimodal imaging.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ping Wei,Shiheng Yin,Tao Zhou,Chao Peng,Xiaolong Xu,Juncai Lu,Minchao Liu,Jianbo Jia,Kun Zhang
The occurrence of pharmaceutical and personal care products (PPCPs) in the ambient environment has raised serious concerns. Herein, a dispersed ZnFe 2 O 4 nanoparticle loaded Ag@Ag 2 CO 3 nanorod hybrid (ZnFe 2 O 4 /Ag@Ag 2 CO 3 ) was facile prepared, and used as a solar light driven photocatalyst for the degradation of tetracycline (TC), a typical PPCPs. The hybrids were characterized by XRD, SEM, EDS, HRTEM, DRS, PL, TRPL, M−H , BET, XPS, ESR and photoelectrochemical testing. The ZnFe 2 O 4 was evenly dispersed on the surface of Ag@Ag 2 CO 3 nanorods of which diameter was about 100 nm. The obtained ZnFe 2 O 4 /Ag@Ag 2 CO 3 composites exhibited high TC degradation efficiency after 150 min Xe light illumination, which was much better than those of pure Ag@Ag 2 CO 3 and ZnFe 2 O 4 . The photodegradation reaction rate constant ( k ) of the optimum ternary photocatalyst (ZnFe 2 O 4 loading 5% wt) increased 4.04 times and 2.48 times than those of pure ZnFe 2 O 4 and Ag 2 CO 3 @Ag, respectively. More importantly, the stability and recovery capacity of the ZnFe 2 O 4 /Ag@Ag 2 CO 3 photocatalyst improved obviously than those of Ag@Ag 2 CO 3 . The reactive oxygen species (ROS) experiment indicated that • OH、h + and • O 2 − involved in the photocatalytic reaction process, and the ROS contributes order was • O 2 − > h + > • OH. The band positions of individual ZnFe 2 O 4 and Ag 2 CO 3 were elucidated via DRUV–Vis spectra and Mott-Schottky plots. Based on the results of ROS experiment and band structure of ZnFe 2 O 4 and Ag 2 CO 3 , it could be inferred that the photocatalytic reaction of ZnFe 2 O 4 /Ag@Ag 2 CO 3 abided by Z-scheme mechanism, that is, Ag acted as the electronic bridge between Ag 2 CO 3 and ZnFe 2 O 4 , and the • OH and • O 2 − were formed on the valence band (VB) of Ag 2 CO 3 and conduction band (CB) of ZnFe 2 O 4 , respectively, and then TC was further oxidized. The sufficient photocatalytic degradation of TC in ambient water revealed that a sunlight-driven ZnFe 2 O 4 /Ag@Ag 2 CO 3 photocatalytic process may be efficiently applied for the remediation of PPCPs contaminated natural waters.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Na Chang,Yan-Ru Chen,Feng Xie,Ya-Pan Liu,Hai-Tao Wang
It is of great importance to fabricate photocatalyst with high photocatalytic activity, and the formation of Z-scheme heterojunction photocatalyst has been proved to be an effective way to restrain the recombination of photo-induced carriers. In this work, Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction is synthesized via a two-step process involving appropriate amount of cationic Ag ion doping into the imidazole ring of ZIF-8 framework and the precipitation of AgCl onto this Ag-doped-ZIF-8. The successful doping of ZIF-8 which decreases the band gap energy, enhances the light harvesting. Besides, the separation efficiency of photo-induced carriers is further improved due to the formation of Z-scheme AgCl/Ag-doped-ZIF-8 heterojunction, which is confirmed by photoelectrochemical experiments. As a result, the as-prepared AgCl/Ag-doped-ZIF-8 photocatalyst possesses excellent photocatalytic activity under visible light illumination. This work will provide a novel perspective for the design and construction of Z-scheme heterojunction for highly efficient photocatalysis.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Qiong Sun,Peng Hou,Songhao Wu,Liyan Yu,Lifeng Dong
A Z-scheme mechanism associated with localized surface plasmon resonance (LSPR) effect is proposed and proved in a ternary Ag-Fe 2 O 3 -TiO 2 composite for photocatalytic reactions. The Ag, Fe 2 O 3 and TiO 2 nanoparticles are prepared to exist in a closely connected Ag-Fe 2 O 3 -TiO 2 heterostructure . Compared to TiO 2 , the addition of Ag-Fe 2 O 3 causes a broad absorption in visible region by LSPR effect of Ag to facilitate electron transfer from TiO 2 to Ag. In addition, electron migration from TiO 2 to Fe 2 O 3 can also be detected, indicating the interface between TiO 2 and Fe 2 O 3 can offer a route with low resistance for charge separation and directional transfer. As a result, photocatalytic activities are greatly improved in Ag-Fe 2 O 3 -TiO 2 , with the highest calculated apparent kinetic constant located at 0.027 min −1 , which is 7.3, 1.9, 1.7 and 1.5 times of Ag-Fe 2 O 3 , TiO 2 , Ag-TiO 2 and Fe 2 O 3 -TiO 2 , respectively. Free radical quenching experiments show that O 2 -∙ and positively charged holes are main oxidative species responsible for the degradation of dyes. Specifically, OH∙ radicals can be hardly found in pure TiO 2 under irradiation but can be extensively produced and participate in the degradation after the addition of Ag-Fe 2 O 3 , which further proves that a Z-scheme route dominates the electron transfer between TiO 2 and Fe 2 O 3 .
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SOLAR ENERGY
·
2021
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IF 5.742
Junye Tong,Shaotong Wang,Gang Wang,Yue Liu,Yuxiang Wang,Liping Chen,Lingling Wang,Daocheng Pan,Xintong Zhang,Yichun Liu
Ion doping strategy is a promising method to enhance the efficiency of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells, however, most of the reported works focus on studying the single ion doping in CZTSSe absorber layers . Here, Li + &Ag + and Li + &Cd 2+ double-ion-doping strategy are applied to improve the microstructure and device performances. We found that the double-ion-doping strategy can obviously increase the grain size, reduce the thickness of fine-grain layers and enhance the device performances. Furthermore, the PCEs of Li + &Ag + and Li + &Cd 2+ doped CZTSSe solar cells are up to 8.87% and 8.39%, respectively. It shows an encouraging improvement of over 43.5% and 35.8% enhancement compared with the traditional method (6.18%), and significantly higher than single ion doping strategy (7.60%, 7.99% and 7.11% for Li + , Ag + , and Cd 2+ doped CZTSSe solar cells). This work provides a new solution to improve the microstructure and device performances of CZTSSe solar cells.
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GREEN CHEMISTRY
·
2020
·Vol. 22
·期 20
·6846-6854
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IF 9.48
Jingpeng Li,Rumin Ma,Yun Lu,Zaixing Wu,Minglei Su,Kexia Jin,Daochun Qin,Rong Zhang,Ruihua Bai,Sheng He,Yuhe Chen,Zehui Jiang
Plant-based natural biotemplates are increasingly gaining popularity for the development of catalytic filters in water treatment owing to their unique features, such as exquisite microstructures, renewable properties, and environmental friendliness. However, the development of catalytic filters, not limited to plant-based filters, to achieve both super-high water flux and excellent treatment efficiency, particularly under gravity-driven conditions, remains challenging. Therefore, herein, an efficient gravity-driven catalytic filter was fabricated using a naturally three-dimensional (3D) porous rattan biotemplate for water treatment. After reducing Ag(NH3)2+ ions via an in situ process that did not involve the addition of reductants or stabilizers, Ag nanoparticles (NPs) were immobilized in the inner microchannel of the porous rattan cane. The intrinsically aligned microchannels in the vascular bundles of rattan (diameter 24–420 μm) acted as reaction compartments for the immobilization and stabilization of Ag NPs. Furthermore, the 3D Ag/rattan filter exhibited excellent gravity-driven catalytic activity (up to 97.2% treatment efficiency for a high water flux of 7471 L m−2 h−1), good recyclability, high water permeability, and stability toward 4-nitrophenol reductions. These excellent properties were attributed to the synergistic effect of the evenly distributed nanosized Ag catalysts and microchannel structures of rattan. Rattan materials are abundantly available and naturally porous, and they can readily serve as cost-effective, nontoxic, biodegradable, and sustainable sources in numerous catalytic applications.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
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IF 2.369
Luxia Yin,Bo Zhang,Jinbing Zhou,Jiacheng Xu,Wanghui Gong,Jianguang Gao,Wensheng Ning,Zekai Zhang,Wei Hua Yu
Ag2O/SiO2–TiO2-n aerogel composites with different molar ratios of Si/Ti, prepared by a sol–gel method followed by the ambient pressure drying technique, were used for the adsorptive removal of thiophenic compounds from model fuels, along with Ag2O/SiO2-50. The physicochemical properties of aerogel composites were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF) spectroscopy, Brunauer–Emmett–Teller (BET) method, Fourier transform infrared (FT-IR) spectroscopy, NH3 temperature-programmed desorption (TPD), and pyridine (Py) FT-IR spectroscopy. The results indicated that doping Ti into Ag2O/SiO2-50 led to a slight decrease in the specific surface area, an obvious increase in the actual content of Ag, and the appearance of weak Lewis acid centers on the surface. The data for equilibrium adsorption of thiophene over Ag2O/SiO2-50 and Ag2O/SiO2–TiO2-50 were well fitted to the Langmuir and Freundlich isotherm equations. The kinetic experimental data of Ag2O/SiO2–TiO2-50 was well fitted by a pseudo-second-order model. For two adsorbents, negative values of ΔG indicated that the adsorption processes were spontaneous. The adsorption process on Ag2O/SiO2–TiO2-50 was more favorable at higher temperatures, which was contrary to that on Ag2O/SiO2-50. The incorporation of Ti into Ag2O/SiO2-50 can improve the adsorptive desulfurization performance owing to the increase in the actual content of Ag species (π-complexation centers), and thiophenic compounds can be adsorbed via Lewis acid–base interaction and S–Ti binding besides π-complexation. Among Ag2O/SiO2–TiO2-n, Ag2O/SiO2–TiO2-50 performed the best.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Gongduan Fan,Zhong Chen,Zhongsen Yan,Banghao Du,Heliang Pang,Dingsheng Tang,Jing Luo,Jiuyang Lin
A novel plasmonic Ag/AgCl@LaFeO 3 (ALFO) photocatalyst was successfully synthesized by a simple in-situ synthesis method with enhanced photocatalytic activity under visible light for harmful algal blooms (HABs) control. The structure, morphology, chemical states, optical and electrochemical properties of the photocatalyst were systematically investigated using a series of characterization methods. Compared with pure LaFeO 3 and Ag/AgCl, ALFO-20% owned a higher light absorption capacity and lower electron–hole recombined rate. Therefore, ALFO-20% had higher photocatalytic activity with a near 100% removal rate of chlorophyll a within 150 min, whose kinetic constant was 15.36 and 9.61 times faster than those of LaFeO 3 and Ag/AgCl. In addition, the changes of zeta potential , cell membrane permeability, cell morphology, organic matter, total soluble protein, photosynthetic system and antioxidant enzyme system in Microcystis aeruginosa ( M. aeruginosa ) were studied to explore the mechanism of M. aeruginosa photocatalytic inactivation. The results showed that ALFO-20% could change the permeability and morphology of the algae cell membrane, as well as destroy the photosynthesis system and antioxidant system of M. aeruginosa . What’s more, ALFO could further degrade the organic matters flowed out after algae rupture and die, reducing the secondary pollution and avoiding the recurrence of HABs. Finally, the species of reactive oxygen species (ROS) (mainly •O 2 - and •OH) produced by ALFO were determined through quenching experiments, and a possible photocatalytic mechanism was proposed. Overall, ALFO can efficiently remove the harmful algae under the visible light, providing a promising method for controlling HABs.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xiao Zhang,Bin Ren,Xi Li,Yanhua Xu,Biming Liu,Peng Yu,Yongjun Sun,Danhua Mei
In this study, graphitic carbon nitride (g-C 3 N 4 ) (CN) was conveniently and environmentally modified into a stable and easily recyclable photocatalyst for the high removal efficiency of dye contaminants in water. Magnetic carrier (CN/Fe 3 O 4 ) and heterojunction photocatalysts (Ag@AgBr/CN/Fe 3 O 4 ) were prepared by ultrasonic and in situ deposition of Fe 3 O 4 and Ag@AgBr nanoparticles on the CN , respectively, and characterized by the surface structure, optical, and electrochemical properties. The effects of different catalysts, silver loading, catalyst dosage, and different aeration conditions on the photocatalytic degradation of RhB were investigated. Results exhibited that the removal rate of RhB by Ag@AgBr/CN/Fe 3 O 4 reached 96% within 150 min when the Ag loading was 5%, the catalyst dosage was 0.4 g/L, and the aeration was air. Furthermore, the degradation rate constant was 17.3 × 10 −3 min −1 , which was 4.3 and 3.4 times higher than that of CN and CN/Fe 3 O 4 , respectively. The stability study demonstrated that Ag@AgBr/CN/Fe 3 O 4 had almost no risk of Ag and Fe leakage and showed high stability. Mechanism study indicated that the construction of Z-scheme heterojunction between Ag@AgBr and CN and trapping electron by Fe 3+ promoted charge transfer and electron–hole pair separation, thus enhancing photocatalytic activity.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Gongduan Fan,Rongsheng Ning,Zhongsen Yan,Jing Luo,Banghao Du,Jiajun Zhan,Lingshan Liu,Jin Zhang
Antibiotic contamination is increasing scrutinized recently. In this work, the Ag−AgCl/WO 3 /g-C 3 N 4 (AWC) nanocomposites were successfully synthesized using a two-step process involving electrostatic self-assembly and in-situ deposition for trimethoprim (TMP) degradation. The as-prepared photocatalysts were investigated and characterized by XRD, FTIR, XPS, TGA, SEM, TEM , UV–vis, PL and EIS. The experimental results indicated that 99.9% of TMP (4 mg/L) was degraded within 60 min when the concentration of AWC was 0.5 g/L. Reactive species scavenging experiments and electron spin resonance (ESR) experiments illustrated that superoxide radical (•O 2 − ) and photogenerated holes (h + ) were the main active species. The functional theory calculation and identification of intermediates via HPLC-MS revealed the possible degradation pathways of TMP. A double photoelectron-transfer mechanism in AWC photocatalyst was proposed. Five cycling photocatalytic tests and reactions under different solution matrix effects further supported that the AWC was a promising photocatalyst for the removal of TMP from the aquatic environment.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yingshuang Song,Yusi Peng,Nguyen Viet Long,Zhengren Huang,Yong Yang
At present, there is an urgent need to develop a highly efficient adsorbent and photocatalyst with photodegradability under visible light for the removal of dye molecules in wastewater. Herein, the multifunctional three-dimensional Ag/g-C 3 N 4 /reduced graphene oxide aerogel (Ag/g-C 3 N 4 /RGOA) has been successfully prepared by a simple “one-pot” hydrothermal method , which exhibits three kinds of improved properties including excellent surfaced-enhanced Raman scattering (SERS) activity, highly efficient adsorption and photocatalytic activity. The composite aerogel presents 3D porous network structure. Importantly, the composite aerogel exhibits excellent adsorption and photocatalytic performance with adsorption rate of 44% and degradation rate of 93%. This is mainly attributed to the synergistic effect of Ag NPs, g-C 3 N 4 and RGO, which promotes the separation of photogenerated electrons and holes. In addition, the 3D porous network structure is conducive to the utilization of visible light and the transfer of photogenerated electrons. Furthermore, Ag/g-C 3 N 4 /RGOA exhibits excellent SERS activity with a detection limit of 1 × 10 −7 M for R6G molecules. The SERS performance has been utilized to monitor the process of adsorption and photodegradation of R6G by the composite aerogel. In this research, the designed multifunctional aerogel may become an attractive material for the detection and removal of dyes in wastewater.
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