Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Chun Pei,Ji-Hua Zhu,Leyang Lv
Semiconductor photocatalysts suffer from low photocatalytic quantum efficiency , diminished solar energy utilization, and inadequate photostability, thereby impeding their widespread adoption. Meanwhile, graphene emerges as an ideal substrate material for fabricating high-performance composite photocatalysts owing to its distinctive single-layer sp 2 -hybridized carbon atom arrangement, substantial specific surface area, exceptional electron conductivity, and pronounced transparency. In this study, a graphene-anatase-rutile core-shell structured nanofiber mat architecture is successfully synthesized by sol-gel-assisted coaxial electrospinning with high-temperature thermal treatment. This innovative architecture effectively narrows the bandgap of TiO 2 and synergizes adsorption and catalysis processes to achieve heightened catalytic efficiency and prolonged stability. Photocatalytic assays conducted under visible light irradiation demonstrate the excellent photocatalytic activity and stability of the graphene-titanium dioxide hybrid material during the degradation of phenol . The kinetics and mechanism of the phenol degradation of the nanofiber mat have been explored. Furthermore, the unique mesh-like configuration intrinsic to the nanofiber assembly confers sedimentation and recyclability upon the composite material.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shuang Liu,Nan Zhao,Liyuan Zheng,Richard I. Foster,Wonseok Yang,Zhe Wang,Yuexiang Lu
Photocatalysis has been regarded as one of the effective methods of removing U(VI) from radioactive wastewater in recent years, due to the benefits of being environmentally friendly and efficient. In this work, a Pt cluster modified carbon nitride photocatalyst (Pt-CN) was synthesized in zinc chloride molten salt. The photocatalysts were characterized by XRD, IR, XPS, UV–vis, PL and EIS. The result demonstrated that the doping of Pt makes Pt-CN show higher electronic conductivity and better charge separation and migration, leading to an enhanced photocatalytic activity and faster kinetics compared with bulk graphitic carbon nitride (g-C 3 N 4 ). Moreover, for uranium contained solution photocatalytic treatment, Pt-CN reached 94.6 % removal efficiency after 300 min of illumination with Xe light, and the kinetics improved by a factor of three compared to that of g-C 3 N 4 . Furthermore, the good reusability and photostability of the Pt-CN was confirmed as the removal efficiency remained at 83.7 % even after being recycled and reused five times. The photocatalytic reaction product was characterized as (UO 2 )O 2 ·2 H 2 O, and the mechanism was deduced as uranium species reacting with H 2 O 2 generated by light illumination in an open system. This molten salt one-step synthesis and Pt doping method and the performance of U(VI) extraction in air showed a promising potential for the application of Pt-CN for U(VI) extraction and removal from water.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Bo Chen,He Liu,Jonghee Yang,Mahshid Ahmadi,Qi Chen,Ni Yin,Shitong Zhang,Meiqin Xiao,Haoyue Zhang,Long Xu,Ping Chen
The bandgap and operation stability of metal halide perovskites (MHPs) based light-emitting diodes (PeLEDs) have been compromised by the substantial surface defect densities in the matrix. Today's defect passivation strategies rely on coordination actions of small-molecular and/or polymeric ligands, which effectively enhance the optical properties of materials. However, the non-trivial insulating characteristics of the molecules concurrently sacrifice the operation stability and external quantum efficiency (EQE) of the PeLEDs by augmenting the charge injection barrier at the interface. Herein, a coordinative, charge-polarized organic semiconductor exhibiting thermally activated delayed fluorescence (TADF), namely 9,9-dimethyl-10-(4-(phenyl sulfonyl)phenyl)-9,10-dihydroacridine (SO-DMAc) is coordinated, into the MHPs matrix for deep-red PeLEDs. Owing to the distinctive charge transfer (CT) between the molecule and MHPs with exclusive coordination at the MHP's bottom, SO-DMAc serves as a molecular bridge that significantly augments the hole injection into the PeLEDs. Encouraged by these improvements, efficient and stable deep red PeLEDs offering EQE of 21.8% and respective half lifetimes (T 50 ) of luminance and EQE exceeding 6 and 35 h are demonstrated. It is revealed that the molecular coordination to the MHP surface is pivotal to manifesting the interfacial CT process for favorable energy level tuning.
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ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Hongbo Peng,Hongyan Gu,Zhimin Xu,Guomei Xiong,Peng Gao,Siyao Wang,Xiongchao Li,Fangfang Li
Ultraviolet light (UV)-assisted advanced oxidation processes (AOPs) are commonly used to degrade organic contaminants. However, this reaction system's extensive comprehension of the degradation mechanisms and toxicity assessment remains inadequate. This study focuses on investigating the degradation mechanisms and pathways of bisphenol A (BPA), generation of reactive oxygen species (ROS), and toxicity of degradation intermediates in UV/PDS/ferrous composites (FeOx) systems. The degradation rate of BPA gradually increased from the initial 11.92% to 100% within 120 min. Sulfate radicals (SO4.−), hydroxyl radicals (.OH), superoxide anions (O2.−), and singlet oxygen (1O2) were the primary factors in the photocatalytic degradation of BPA in the UV/PDS/FeOx systems. The main reactions of BPA in this system were deduced to be β-bond cleavage, hydroxyl substitution reaction, hydrogen bond cleavage, and oxidation reaction. A trend of decreasing toxicity for the degradation intermediates of BPA was observed according to the toxicity investigations. The efficient degradation of BPA in UV/PDS/FeOx systems provided theoretical data for AOPs, which will improve the understanding of organic contaminants by FeOx in natural industry wastewater.
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高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Wei Sun,Jiale Lu,Bo Feng,Amin Jv,Yufei Zhang,Jingwen Wang,Renquan Guan,Chunbo Liu
The construction of highly efficient charge transfer channels is crucial for effectively extending the lifetime of photogenerated carriers in heterostructures and enhancing their photocatalytic activity. In this study, ferrocene carboxylic acid (Fc-COOH) was successfully bonded to the surface of amino-modified titanium (Ti) through amide bonding. This modification not only preserved the excellent structure of MIL-125(Ti) but also broadened the light absorption range and effectively prolonged the lifetime of photogenerated charge carriers. The degradation rate of tetracycline by NTFCC-1.0, which exhibited the highest photocatalytic activity, exceeded 90% within 40 min, significantly outperforming the composite sample without amide bond connection. In addition, the mechanism of enhancing photocatalytic activity was further explored, and the toxic side effects of degradation intermediates on the environment were simulated through software. This work presents a novel approach for modifying MOF-based materials.
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ACS Photonics
·
2017
·
IF 6.756
Tanglue Feng,Qingsen Zeng,Siyu Lu,Xianju Yan,Junjun Liu,Songyuan Tao,Mingxi Yang,Bai Yang
In this paper, a unique strategy is proposed to modulate fluorescence color of carbon dots (CDs) under both aqueous solution and solid state for bright multicolor light-emitting diodes (LEDs) applications. We report facile synthesis of dual-peak-emissive CDs with self-quenching-resistant character under solid state through hydrothermal method, and investigate the origins of dual-peak emission for the first time. In addition, based on the unique dual-peak-emissive phenomenon, acid-mediated PL behaviors were realized by changing the pH value of hydrothermal precursors. We realized the color-tunable fluorescence under aqueous solution from blue (B-CDs) to yellow-green (YG-CDs) color and solid state from yellow to orange-red color. The changed PL behaviors are attributed to the more conjugated structure inside CDs due to elevated carbonization degree. Furthermore, the red-shifted fluorescence from aqueous solution to solid state is ascribed to supramolecular cross-linking between adjacent particles. Thus, by manipulating the supramolecular cross-linking degree of YG-CDs in PVA, a series of luminescent blue-shifted CDs/PVA composite phosphors were obtained. Finally, we fabricate the almost full-color and white color LEDs with decent performances, which indicate their potential for solid-state lighting applications.
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ANALYTICAL CHEMISTRY
·
2017
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IF 6.32
Chunxiang Li,Weisen Lu,Ming Zhu,Bo Tang
The performance of the photoelectrochemical (PEC) bioanalysis relies closely on the properties of the used photoactive species. In this study, a visible-light induced PEC active species, [(C6)2Ir(dcbpy)]+PF6– (C6 = coumarin 6, dcbpy = 2,2′-bipyridine-4,4′-dicarboxylic acid) was prepared based on C6 with the stronger absorbance in the visible region. The as-prepared complex was characterized by 1H NMR, UV–visible absorption and cyclic voltammetry. It exhibits intense absorption in visible region at 480 nm with a molar extinction coefficient (ε) of more 40000 M–1 cm–1, which is approximately twice that of Ru(bpy)32+. The PEC behaviors of the iridium(III) complex were investigated through covalently attaching to the ITO electrode. Induced by visible light, a large and stable cathodic photocurrent can be observed when dissolved O2 is served as a sacrificial electron acceptor. Also probable mechanisms of photocurrent generation are deduced. Employing [(C6)2Ir(dcbpy)]+PF6– as signal reporter, the Au NPs-based nanoprobe was constructed and successfully applied to assembly PEC platform based on the Exo III-assisted recycling amplification for bioanalysis. With thrombin as a model analyte, the PEC platform was found to be logarithmically proportional to thrombin concentrations across the range from 20 fM to 10 pM with fine selectivity, indicating excellent PEC properties of the synthesized Ir(III) complex and enormous potential for PEC bioanalysis.
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Frontiers in Plant Science
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2017
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IF 4.291
Ye Shenyi,Shao Qingsong,Xu Mengjie,Li Shuailing,Wu Mei,Tan Xin,Su Liyang
The aim of this study was to investigate the effects of light quality on the morphological traits, leaf anatomical characteristics, antioxidant enzyme (superoxide dismutase, catalase, and peroxidase) activities, photosynthetic pigments content, and bioactive compounds (phenols, flavonoids, and polysaccharides) content in Anoectochilus roxburghii. Plants of A. roxburghii were grown under light filtered through four differently colored films for 8 months. The four treatments were red film (RF), blue film (BF), yellow film (YF), and colorless plastic film (control, CK). Compared with the A. roxburghii plants in CK, those in the BF treatment showed significantly greater stem diameter, fresh weight, leaf area, stomatal frequency, chlorophyll content (Chl a, Chl b, Chl a+b), antioxidant enzyme activities, and active compound (polysaccharides, flavones) content. The plants in the RF treatment showed the greatest plant height and phenolics contents. These results show that growing A. roxburghii plants under blue film is a useful technique to improve quality. This technique is conducive to achieving large-scale sustainable production of high-quality plant materials.
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Small Structures
·
2024
·Vol. 5
·期 3
·2300418
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IF 13.9
Bingkun Wang,Zheng Li,Huijuan Wu,Shan Zhang,Guanglin Zhang,Jinqiu Zhang,Shanshui Lian,Li Zheng,Zhongying Xue,Siwei Yang,Guqiao Ding,Wenwu Xu,Shiwei Tang,Gang Wang
Surface-enhanced Raman scattering (SERS) is a versatile spectroscopic technique, which plays a crucial role in enhancing analytical sensitivity, investigating interfacial reaction mechanisms, enabling biosensing, and fostering efficient catalysis. Currently, the common SERS substrates are primarily metal nanostructures, which entail high manufacturing costs, complex processes, and the metal surface undergo change over time and with environmental conditions. These issues limit the development of SERS technology. In this work, a nitrogen-doped graphene (N-graphene) hydrangea was synthesized on a silicon (Si) substrate using plasma-assisted chemical vapor deposition (PACVD), forming an N-graphene hydrangea/Si hybrid structure as a SERS substrate. This substrate offers the advantages of high stability, ultra-sensitivity, and reusability. The three-dimensional nano-cavity structure of graphene can increase the interaction between light and graphene, resulting in an increased localized electric field. Combining theoretical simulation analysis, the introduction of nitrogen (N) elements adjusts the Fermi level of graphene, promoting efficient charge transfer. In practical scenarios, Di(2-ethylhexyl) phthalate (DEHP), a commonly used plasticizer, has raised concerns due to its potential as an endocrine disruptor and carcinogen. The as-prepared SERS substrate achieves a remarkable detection limit of as low as 10 −8 m for DEHP, providing significant support for environmental conservation and human health.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Xiaolong Rong,Ying Han,Hao Dai,Haixia Jiang,Yingang Xue
Black phosphorus nanosheets (BPNS), a novel two-dimensional nanomaterial, find extensive applications in the field of photocatalysis. With the prohibition of bisphenol A (BPA), the utilization of bisphenol S (BPS), which is more resistant to degradation than BPA, has been steadily increasing. In this study, few-layer BPNS was prepared using an improved liquid-phase exfoliation method, showcasing its commendable specific surface area and notable adsorption capacity. Subsequently, a new type of nanocomposite material, BPNS-Cadmium sulfide (CdS), was hydrothermal synthesized involving BPNS and CdS. We conducted comparative assessments of BPNS, CdS, and their composite materials to identify the most efficient catalysts. Ultimately, we found that the composite material BPNS-CdS exhibited the highest capability for degrading BPS in an alkaline environment, achieving an impressive degradation rate of 86.9%. Notably, the degradation rate remained higher in an acidic environment compared to a neutral one. Through Electron Spin Resoance (ESR) experiments, it is revealed that BPNS-CdS, when exposed to visible light, generates •O 2 − , •OH, and h + as confirmed. Additionally, we tested and validated the carrier separation and migration abilities of BPNS-CdS while also calculating the band gap for each material. Building upon these results, a possible photocatalysis mechanism experiment was proposed. Finally, the degradation products were analyzed using High-Performance Liquid Chromatography-Mass Spectrometry (HPLC-MS) and put forth a plausible pathway for the BPS degradation, and it was found that 4-Phenolsulfonic acid, Ethyl protocatechuate and Isophthalic acid are the main intermediates of BPS. This study contributes to a deeper understanding of the synergy between non-metallic catalysts like BPNS and metal catalysts like CdS. It also offers new insights into the degradation mechanisms and pathways for BPS.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Beijia Yuan,Liang Bao,Huaiwei zhang,Yong-jun Yuan
In this paper, carbon supported Bi 2 O 3 -BiOCl-Bi heterostructures were successfully synthesized via a facile and simple hydrothermal method. A series of structure and morphology testing clearly showed that carbon and metallic Bi were deposited on the surface margin of Bi 2 O 3 -BiOCl, which benefited the rapid transfer of internal photogenerated electrons. Photophysical experiments including electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) indicated that the amount of surface oxygen vacancies (OVs) was significantly increased, which act as reactive active sites and therefore effectively enhance the photocatalytic performance. The photocatalytic N 2 reduction yield of C@Bi 2 O 3 -BiOCl-Bi was remarkably improved to 400 μg·L −1 , which was 3.63 times higher than that of BiOCl. This research demonstrated a feasible strategy to construct advanced photocatalyst by incorporating defect-rich structures and surface engineering.
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JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Xiaowei Deng,Shanshan Cheng,Xu Chen,Meng Wang,Xu Li,Gaoqiang Li,Dongyang Zhu,Mochen Jia,Xinjian Li,Zhifeng Shi
Lead-free perovskite is a non-toxic and environmentally friendly material, which plays an increasingly significant role in photodetection, luminescence, photovoltaics and so on. In this paper, a single-component white light emission is successfully achieved through the co-doping of Sb 3+ , Mn 2+ and Tb 3+ in Cs 2 NaInCl 6 . The photoluminescent mechanism is proved through the spectra measurements and decay dynamics. The addition of Sb 3+ could activate the self-trapped exciton (STE) emission of the matrix (blue light at 450 nm). The efficient energy transfer from STE emission could realize red light emission of Mn 2+ , and green light emission of Tb 3+ . The single-component white light emission is obtained with the Commission Internationale de L'Eclairage of (0.31, 0.35), high color rendering index of 88.1 and correlated color temperature of 6394 K. Finally, the prepared white light emitting diodes demonstrate high performance and excellent stability. This provides a new idea for development of lead-free perovskite white luminescent materials in display and lighting applications.
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