JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Zhouzhou Li,Zheng Li,Feng He,Wen He,Qixu Chen,Hongqing Wang
Recently, how to improve the photocatalytic uranium removal performance of Graphite-phase carbon nitride (GCN) has always been a hot research topic. In this paper, a new strategy based on p-n junction and D-A structure is proposed to improve the photocatalytic performance. And as a result, a novel cyano modified photocatalytic material NC-GCN/Ag 2 O was designed and prepared for the reduction of U(VI). Interestingly, the material shows better adsorption performance for U(VI) in the dark treatment stage, and its removal of U(VI) is close to 70 % under the initial U(VI) concentration of 20 ppm and the solid–liquid ratio of 0.2 g/L. And the adsorption is in accordance with the Langmuir model and Pseudo second order model. After 30 min of illumination, the removal rate of U(VI) can reach 93.2 %, significantly higher than that of GCN (13.6 %) and NC-GCN 10 (37.7 %). It’s worth mentioning that photocatalytic reduction dominated the adsorption-reduction process for U(VI) removal after light exposure. In addition, after four cycles, the removal of U(VI) from the composite material decreased by only 5 % with no change in the crystal structure, i.e., it has good reusability and stability. Meanwhile, there was no significant interference with other ions except for Cu 2+ and V 5+ , which had a weak interference. Finally, a new mechanism for U(Ⅵ) reduction was proposed.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
International Journal of Nanomedicine
·
2023
·
IF 8
Ruojing Qian,Zhaoyu Xu,Xingyu Hu,Suru Liu,Yao Mai,Xinzhi Tan,Xiaofan Su,Mingyan Jiang,Wei Tang,Weidong Tian,Li Xie
Purpose A synergistic antibacterial system employing photocatalytic performance and low-temperature photothermal effect (LT-PTT) with the potential for infectious skin wound healing promotion was developed.Methods Ag/Ag2O was synthesized with a two-step method, and its physicochemical properties were characterized. After its photocatalytic performance and photothermal effect were evaluated under 0.5 W/cm2 808 nm NIR laser irradiation, its antibacterial activities in both planktonic and biofilm forms were then studied in vitro targeting Staphylococcus Aureus (S. aureus), and the biocompatibility was tested with L-929 cell lines afterward. Finally, the animal model of dorsal skin wound infection was established on Sprague-Dawley rats and was used to assess infectious wound healing promotion of Ag/Ag2O in vivo.Results Ag/Ag2O showed boosted photocatalytic performance and local temperature accumulation compared with Ag2O when exposed to 0.5 W/cm2 808 nm NIR irradiation, which therefore endowed Ag/Ag2O with the ability to kill pathogens rapidly and cleavage bacterial biofilm in vitro. Furthermore, after treatment with Ag/Ag2O and 0.5 W/cm2 808 nm NIR irradiation, infectious wounds of rats realized skin tissue regeneration from a histochemical level.Conclusion By exhibiting excellent NIR-triggered photocatalytic sterilization ability enhanced by low-temperature photothermal effect, Ag/Ag2O was promising to be a novel, photo-responsive antibacterial agent.
研究领域:
生物医学工程
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材料科学
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微生物学
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DOI
PubMed
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 28
·13661-13672
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IF 7.233
Wei Jiang,Hongyan Fu,Yingming Zhu,Hairong Yue,Shaojun Yuan,Bin Liang
In this research, a controlling mechanism of particle size on the wettability of Ag2O particles is reported, and an interesting floatable Ag2O photocatalyst with superhydrophobicity and superoleophilicity is prepared based on this mechanism. Stable superhydrophobic and superhydrophilic Ag2O without a low-surface-energy modifier can be obtained only by adjusting its particle size, and its wettability can switch mutually by changing the particle size. The wettability of Ag2O converts from superhydrophilic to hydrophobic when the average particle size is more than 1.08 μm. The operation parameters of the Ag2O crystallization process significantly influence the wettability of the Ag2O particles. The obtained superhydrophobic Ag2O floated on the water surface, and exhibited excellent photodegradation performance with various floating oils. This attractive superhydrophobic Ag2O photocatalyst is promising for practical applications, and provides a strategy for the development of functional photocatalysts and superhydrophobic materials.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
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IF 8.355
Enqi Bu,Ying Chen,Chao Wang,Zhengdong Cheng,Xianglong Luo,Riyang Shu,Jingtao Zhang,Mingzheng Liao,Zhiqiang Jiang,Qingbin Song
Photoreforming of bio-derived liquids is anattractive approach toward sustainable H 2 production. Although a large number of bio-liquids are thermodynamically feasible for photocatalytic hydrogen production, few of them have been involved in this process due to their water insoluble nature. To achieve and promote the efficiency of photoreforming hydrogen production in bio-derived biphasic system, the Pickering interfacial catalysis was established over an amphiphilic Ag 2 O-TiO 2 /SiO 2 catalyst. In this case, the Ag 2 O-TiO 2 /SiO 2 sample was synthesized by means of an electrostatic self-assembly method by surface charge regulation of SiO 2 and the surface hydrophobic modification of Ag 2 O-TiO 2 /SiO 2 particles using a Pickering emulsion method. As shown in the results, the amphiphilic Ag 2 O-TiO 2 /SiO 2 particles were observed to successfully stabilize the bio-octanol/water emulsion. Even the complex structure and surface modification slightly reduce the light absorption efficiency and specific surface area of the catalyst, the hydrogen yield was greatly promoted over Ag 2 O-TiO 2 /SiO 2 compared to that of bare TiO 2 , Ag 2 O-TiO 2 and TiO 2 /SiO 2 . It was also discovered that the cyclic hydrogen production performance can be improved by simple re-emulsification. The effect of bio-octanol concentration for photoreforming was studied by a Langmuir-Hinshelwood-type kinetic model, and the reaction rate constant and bio-octanol adsorption constant were obtained. This study shows that photocatalyst after effective surface amphiphilic modification could provide a prospective approach for the hydrogen production from a bio-derived oil/water biphasic system under solar light.
研究领域:
能源科学
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材料科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Qiang Le,Zhilin Cheng
As the adsorption technique was concerned, the facile, intact and low-cost separation process of adsorbents was desirable to the prospective feasible application. In present work, the nano-Ag 2 O particles were encapsulated in the hollow nanostructure of halloysites (HNTs) with the aid of CTAB-stabilized HNTs micelle by the space confinement method, and then the nano-Ag 2 O@HNTs nanocomposite was assembled in PVP/PAN electrospinning nanofiber membrane (NFM), and finally PVP template was removed through etching method, so as to access the hierarchical-porous structure. The structure and composition of nano-Ag 2 O@HNTs/PAN NFM were resolved by a series of characterizations. The nano-Ag 2 O@HNTs/PAN NFM not only was of abundant multi-pore structure with larger specific surface area of 23.484 m 2 /g and higher pore volume of 0.111 mL/g, but also exhibited excellent mechanical performance, of which the tensile strength and Young's modulus were up to 6.1 MPa and 75.9 MPa, respectively. Thanks to the existence of the exclusive pore structure and nano-Ag 2 O, the nano-Ag 2 O@HNTs/PAN NFM showed better adsorption desulfurization performance in the simulated thiophene (TH) oil, of which the breakthrough and saturated adsorption capacity were as high as 35.269 mg/g and 54.481 mg/g, respectively. Ultimately, the adsorption mechanism of TH molecules on the nano-Ag 2 O@HNTs/PAN NFM could be taken into account the synergistic effect of the porous diffusion , interface adsorption and active site adsorption.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Fujin Sun,Jian He,Pan Wu,Qihui Zeng,Changjun Liu,Wei Jiang
A magnetic aggregation bed photocatalytic reactor (MABPR) was designed and constructed to achieve continuous photodegradation of methyl orange (MO) solution without subsequent photocatalyst separation. A magnetic photocatalyst, CoFe 2 O 4 -Ag 2 O, was scattered and immobilized on aggregated flower-like Fe 3 O 4 structures, which were anchored to the reactor with external magnets at the bottom. Under optimal operating conditions, MO is effectively photodegraded in the MABPR in 60 min with a fluid velocity of 0.01 m/s and a 100 mT magnetic field under natural illuminance (E v ). Magnetic aggregates in the MABPR support the magnetic photocatalyst, increasing their effective irradiation area and also increasing fluid disturbance to enhance mass transfer. Additional energy input for photodegradation and photocatalyst recovery were not required to operate the MABPR; the mass of photocatalyst did not decrease over the course of the experiment. The MABPR proposes a promising design for a usable, cost-effective, low-energy, continuous photoreactor using a magnetic photocatalyst.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
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2017
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IF 0
Ying Bai,Xue Mao,Jun Song,Xia Yin,Jianyong Yu,Bin Ding
Study of high-efficiency and free secondary pollution TiO 2 based photocatalyst has become the one of the most urgent problems in improving the decolorization effect of the waste water from printing and dyeing mill. In this work, a novel self-standing Ag 2 O@YSZ-TiO 2 p-n nanoheterojunction nanofibrous membrane was designed for ultraviolet (UV) photocatalyst by a facile combination of electrospinning technique and precipitation process. Moreover, the UV photocatalytic performance of the flexible AZT p-n nanoheterojuction nanofibrous membranes with a band gap energy of 2.89 eV and good reversibility of 5 cycles, was superior to the commercial catalyst P25 for photocatalytic degradation of methylene blue. Furthermore, the photocatalytic mechanism of the flexible Ag 2 O@YSZ-TiO 2 nanofibrous photocatalyst was proposed by the electron transition in Ag 2 O/TiO 2 p-n nanoheterojunction, which showed a new insight to development of flexible and high-efficiency nanoheterojunction nanocrystalline photocatalytic membranes.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2020
·Vol. 38
·期 2
·2000272
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IF 3.099
Gongduan Fan,Jiuhong Lin,Mingqian Xia,Jing Luo,Banghao Du,Heliang Pang,Zhongsen Yan
Photocatalysis has attracted much attention as an emerging algae removal technology, but the inactivation performance is inevitably affected by the extracellular polymeric substance (EPS) produced by algae. In this study, a photocatalyst (Ag 2 O/g-C 3 N 4 ) with efficient algae inactivation is adopted to investigate the interactions with EPS, and the impact of EPS on photocatalytic algae removal is studied. The results show that EPS can adhere to the surface of Ag 2 O/g-C 3 N 4 by electrostatic force. The interaction with EPS decreases the surface zeta potential of the Ag 2 O/g-C 3 N 4 from 7.71 to −22.3 mV with the increase in EPS concentration, and the maximum ratio of particle size increases from 825 to 1281 nm. In addition, the interaction with EPS inhibits the release of Ag + in Ag 2 O/g-C 3 N 4 by half, thus, the toxicity of metal ions will be alleviated. Meanwhile, EPS can also be degraded by Ag 2 O/g-C 3 N 4 , indicating that EPS can work as a radical scavenger to protect the algae cells. Without the protection of EPS, 97.8% of algae cells are inactivated after 5 h photocatalysis. Therefore, more attention should be given to the interaction between EPS and photocatalyst to promote the design and application of the photocatalytic.
研究领域:
环境科学
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生物学
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DOI
高影响因子
LANGMUIR
·
2025
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IF 3.9
Shuo Yang,Kaiyue Li,Wei Feng,Ping Huang,Keyan Liu,Yuquan Zhuo,Wenhui Li,Ziwen Yang,Donglai Han
As the widespread discharge of antibiotics, pesticides, and dyes exacerbates water pollution, the development of efficient photocatalytic materials has become crucial for addressing this challenge. In this study, a new paradigm of n-p-p ternary heterojunction photocatalyst composed of ZnO nanospindle, Ag2CO3, and Ag2O nanoparticles was synthesized via a hydrothermal and coprecipitation method followed by calcination. By adjusting the calcination time, the phase transition from Ag2CO3 to Ag2O was precisely controlled, leading to enhanced charge separation, transition, and improved light absorption properties. The prepared ZnO/Ag2CO3/Ag2O (Z/AC/A) photocatalyst exhibited outstanding photocatalytic performance for the degradation of typical water pollutants, including 2,4-dichlorophenol (2,4-D), tetracycline (TC), and malachite green (MG) under simulated sunlight irradiation. And the photocatalytic efficiencies reached 90.8, 94.8, and 97.4%, respectively, with the ZnO/Ag2CO3/Ag2O photocatalyst, which was calcined at 195 °C for 12 min, abbreviated as Z/AC/A-3, demonstrating the highest activity. Radical scavenging experiments and electron spin resonance (ESR) tests revealed that superoxide radicals (•O2–) serve as the dominant active species, while holes (h+) and hydroxyl radicals (•OH) play secondary roles in the photocatalytic process. Additionally, the photocatalytic degradation mechanism was confirmed to follow a dual Z-scheme charge transfer pathway, which effectively enhanced the charge separation and photocatalytic performance. The photocatalyst also exhibited excellent structural stability and reusability over five consecutive cycles. These results suggest that the Z/AC/A n-p-p ternary heterojunction holds promising potential for practical photocatalytic applications in environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 5
·3122-3129
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IF 3.708
Jinjuan Xue,Shuaishuai Ma,Yuming Zhou,Zewu Zhang,Xin Wu,Chenguang She
Novel Ag2O/N-doped helical carbon nanotubes (Ag2O/N–HCNTs) were successfully synthesized via a simple coprecipitation method and were well characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). The photocatalytic activities were evaluated in the degradation of methylene blue (MB) aqueous solution. The results showed that Ag2O nanoparticles sized 3–10 nm were highly anchored on the surface and inner tubes of the N–HCNTs support, and significantly enhanced the visible-light photocatalytic activity compared to bare Ag2O. It was attributed to the combined effects, including highly dispersed smaller Ag2O particles and higher charge separation efficiency. The possible mechanism for the photocatalytic activity of Ag2O/N–HCNTs was also tentatively proposed. In particular, the rate of degradation of the as-prepared Ag2O/N–HCNTs was 3.9 times faster than that of using bare Ag2O nanoparticles under visible light irradiation. Furthermore, the Ag2O/N–HCNTs could be easily recycled in visible photocatalytic activity. In addition, the Ag2O/N–HCNTs could also degrade MB dye in different water sources like Changjiang River water and tap water with high efficiency as well as in deionized water and that will greatly promote their application in the area of environmental remediation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
TALANTA
·
2024
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IF 5.6
Tao Gai,Jiaolai Jiang,Shaofei Wang,Ling Zhang,Yiming Ren,Zhen Qin,Qian Wu,Jun Zhang,Junsheng Liao
Uranium is an essential nuclear material in civilian and military areas; however, its extensive application raises concerns about the potential safety issues in the fields of environmental protection and nuclear industry. In this study, we developed an Ag/Ag 2 O–COF (covalent-organic framework) composite SERS substrate to detect uranyl ions (UO 2 2+ ) in environmental aqueous solutions. Herein, the strong SERS effect of uranyl adsorbed in Ag/Ag 2 O composite and the high adsorption efficiency of COF TpPa-1 were combined to realize the trace detection of uranyl ions. This method displayed a linear range of 10 −8 mol L −1 to 10 −6 mol L −1 with the detection limit of 8.9 × 10 −10 mol L −1 for uranyl ions. Furthermore, common metal cations and oxo-ions hardly affected the SERS detection of uranyl, which is helpful for the trace analysis of uranyl in natural water samples. Although the proposed strategy is deployed for uranyl detection, the reusable and high-efficiency system may be expanded to trace detection of other substance with Raman activity.
研究领域:
分析化学
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环境科学
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核科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Junhui Yi,Haoxian Zeng,Hai Lin,Minghao Li,Runkun Xie,Beifang Chen,Runsi Ding,Zhenghui Liu,Dehao Li,Ning Li
Rational design of Z-scheme heterojunction is known to be a good strategy for promoting photogenerated charge efficient separation. In this paper, a direct Z-scheme Ag 2 O/Bi 2 MoO 6 heterostructured microspheres with good interfacial properties were successfully prepared by hydrothermal synthesis-coprecipitation-calcination decomposition. Various techniques such as Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and powder X-ray diffraction (PXRD) were used to reveal the structure, morphology, composition, electrochemical and optical properties of the target product. The catalytic activity of the as-prepared composite was evaluated by visible light degradation of Rhodamine B (RhB) and transient photocurrent. As expected, the results showed that 1:5 Ag 2 O/Bi 2 MoO 6 exhibited the optimal catalytic performance. And the visible degradation efficiency is up to 86% in 90 min, which was 2.69 times higher than that of Bi 2 MoO 6 (32%). And 1:5 Ag 2 O/Bi 2 MoO 6 exhibited the highest photocurrent efficiency (0.8 μA/cm 2 ). Meanwhile, the efficiency of 1:5Ag 2 O/Bi 2 MoO 6 keep 90% after four cycles. The enhanced activity can be attributed to the formation of a good interfacial contact between Ag 2 O and Bi 2 MoO 6 . In addition, hole and superoxide were identified as the main active species. Eventually a possible direct Z-scheme mechanism was proposed to explain enhanced performance. This work may provide a new perspective for the rational design of excellent Bi 2 MoO 6 -based Z-scheme heterojunctions for environmental remediation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）