JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Jinyan Du,Na Xu,Pingchuan Yuan,Qin Shu,Chaofeng Wang,Qidi Xu,Ping Zhang,Shujuan Zhuo,Changqing Zhu
Using ammonium chloride (NH 4 Cl) as a gas template, we conveniently fabricated ultrathin two-dimensional layered silver-embedded graphitic carbon nitride nanosheets (AgCNS) by melamine blowing method with triazine groups of pristine graphite carbon nitride. Compared with bulk g-C 3 N 4 (BCN) and g-C 3 N 4 nanosheets (CNS), the antibacterial activity of the optimized AgCNS-5 at a minimum inhibitory concentration (MIC) of 40 ppm against Escherichia coli ( E. coli ) was significantly enhanced. Under visible-light irradiation, E. coli could be completely killed by 100 µg·mL −1 of AgCNS-5 within 30 min. The mechanism of enhanced antibacterial activity was systematically investigated by ultraviolet-visible diffuse reflectance spectra (UV-vis DRS), photoluminescence spectra (PL), electrochemical impedance spectroscopy (EIS), and photogenerated current densities. Surface plasmonic resonance (SPR) of Ag nanoparticles (NPs) with g-C 3 N 4 was found to lead to an enhancement of visible light absorption and an acceleration of photo-induced electron-hole migration/separation, which is responsible for the enhanced photocatalytic bactericidal performance. Through trapping experiments and electron spin resonance spectroscopy (ESR) techniques, the bactericidal mechanism was revealed that the species of •O 2 − and •OH play important roles in antibacterial process. Considering the facile preparation and excellent performance, AgCNS-5 may be a promising and competitive visible-light-driven candidate toward sterilizing agent.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2022
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IF 1.193
Gul AWIAZ,Xiaoxia WU,Chenguang ZHANG,Ting PAN,Xiawei XU,Jie LIN,Aiguo WU
Surface-enhanced Raman spectroscopy (SERS) technique with high sensitivity and specificity, exhibits huge application potential in tumor cells imaging. In this work, Au@Ag-Au core@double shell bimetallic nanoparticles (Au@Ag-Au NPs) with excellent biocompatibility and good SERS activity were successfully designed and prepared, and Au@Ag-Au NPs showed uniform size and shape. The results of UV-vis spectra revealed that surface plasmon resonance (SPR) peak of Au@Ag-Au NPs generated bathochromic shift compared to that of Au@Ag NPs, inducing high SERS activity under 532 nm illumination. The limit of detection (LOD) for 4-mercaptobenzoic acid (4MBA) molecules adsorbed on Au@Ag-Au NPs was 5 × 10 −9 M, indicating this alloy nanostructure with good SERS detection sensitivity. Moreover, Au@Ag-Au NPs SERS substrate exhibited almost none toxicity from the methyl thiazolyl tetrazolium (MTT) assay results. Au@Ag-Au@4MBA SERS bioprobe was grafted with reductive bovine serum albumin-folic acid (rBSA-FA), which improving SERS bioprobe stability, and providing specific recognition ability for tumor cells. Importantly, SERS imaging results of HepG2 cancer cells targeted with Au@Ag-Au@4MBA@rBSA-FA bioprobes demonstrated Au@Ag-Au NPs-based SERS bioprobe could effectively recognize tumor cells. This work indicated that high-resolution SERS imaging mode would play an important role in tumor imaging for cancer diagnosis.
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COMPOSITES COMMUNICATIONS
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2023
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IF 8
Shan-Jiang Wang,Dan Su,Huan-Li Zhou,Xi Yan,Xiao-Yang Zhang,Tong Zhang
In this work, a flexible Janus composites membrane fabricated by large-scale electrospinning, a rapid plasma etching process, and reproducible surface modification is proposed for stable and efficient solar desalination. The upper hydrophobic plasmonic absorbers are used for effective solar absorption while the bottom hydrophilic polymer layer is for water supply and salt resistant. The heat stability and cycle tests demonstrate their superior performance for steam generation (energy conversion efficiency with 76.06% under 6 sun and stable water output with 7.533 kg m −2 h −1 ). Such Janus membrane provides an alternative way for direct solar desalination, which is achieved by a scalable and cost-effective process.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhentao Song,Limin Wang
In this work, the heterostructure of CoS x /Ag/Ag 2 S/ZnIn 2 S 4 (CAAZ) was synthesized by photodeposition reaction, cation exchange and low temperature solvothermal reaction. The degradation kinetic constants of TC and MO by CAAZ-3 within 60 min were 2.5 and 7.1 times that of pure ZnIn 2 S 4 , respectively, and CAAZ-3 still maintained good catalytic activity after 5 cycles. ZnIn 2 S 4 nanosheet is attached to the surface of CoS x hollow structure, which increases the reactive active site and improves the efficiency of light utilization. Notably, the introduction of Ag/Ag 2 S nanoparticles accelerates the conduction rate of photogenerated charge between the interfaces, which is consistent with the results of photochemical tests. It was found that the synergistic interaction of •O 2 - and h + played an important role in the degradation process of TC molecules. This study focuses on the development of photocatalysts for the efficient degradation of organic pollutants and theoretically demonstrates the importance of optimizing conductive interfaces for improving photocatalytic activity.
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Biosensors-Basel
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2022
·Vol. 12
·期 10
·881
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IF 5.743
Pei Dai,Xianzhi Huang,Yaqian Cui,Lihua Zhu
Tetrabromobisphenol A (TBBPA) was one of the most widely used brominated flame retardants. However, it easily contaminates nature and harms the environment and human health during its production and use. Therefore, it is necessary to strictly control the content of TBBPA in electronics. Surface-enhanced Raman spectroscopy has the advantages of being fast and sensitive, but it is difficult to obtain the SERS spectra of TBBPA because the hydrophobic TBBPA molecule is difficult to approach with the hydrophilic surface of common noble metal SERS substrates. In the present work, a hydrophobic Cu-Ag chip was developed for the SERS detection of TBBPA. The integration of the hydrophobic interaction and the Ag-Br bonding promoted the adsorption of TBBPA on the Cu-Ag chip, allowing for SERS detection. It was observed that both the hydrophobicity and bimetallic composition of the Cu-Ag chip played important roles in the SERS detection of TBBPA. Under the optimized conditions, the low limit of detection of the established SERS method for TBBPA was 0.01 mg L−1, within a linear range of 0.1–10 mg L−1. Combined with ultrasonic-assisted extraction, the substrate could be used for the quantitative determination of TBBPA in electronic products. Compared with the HPLC-UV method used as a national standard, the relative error of the SERS method for quantifying the TBBPA content in a mouse cable and shell was ±3% and ±7.7%, respectively. According to the SERS results, the recovery of TBBPA in the spiked mouse shell was 95.6%.Keywords:tetrabromobisphenol A;surface-enhanced Raman scattering;hydrophobic interaction;bi-metal chips;synergistic coupling
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Mao Shen,Wei Li,Fengzao Chen,Lei Chen,Yuxiang Chen,Suqing Chen,Shibin Ren,Deman Han
Bisphenol A (BPA) is a potential endocrine-disrupting compound with adverse effects on both human health and the environment. Therefore, it is urgent to develop a convenient, sensitive and accurate method for BPA detection. In this paper, a ratiometric electrochemical sensor for BPA detection was developed using Ag@Fe 3 O 4 -rGO composite modified glassy carbon electrode (GCE), with the peak oxidation current of silver nanoparticles (NPs) in the material as the reference signal and the peak oxidation current of BPA as the indicator signal. The Ag@Fe 3 O 4 -rGO composite was prepared by a simple one-step solvothermal method. Due to the chemical functionality and two-dimensional structure, the rGO combined with Ag@Fe 3 O 4 core–shell NPs provides an excellent platform for BPA detection. The morphology, structure and electrochemical performance of Ag@Fe 3 O 4 -rGO composite were characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy and electrochemical techniques. The proposed ratiometric electrochemical BPA sensor shows the linear detection range of 0.1–10.0 µM (R 2 = 0.997), with detection limit of 0.028 μM (S/N = 3), good selectivity, reproducibility and stability. In addition, this proposed ratiometric electrochemical sensor was successfully verified in the detection of BPA in real water samples.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xiangyu Peng,Jiayi Tian,Shuai Zhang,Wei Xiao,Xiaozhen Tian,Yubin Wang,Juanqin Xue,Dashi Lei
Rational design of photoelectrode with high visible light utilization rate and separation efficiency of electron-hole pairs is the key step in photoelectrocatalytic technology. In this work, Z-Scheme photoelectrocatalyst (ZTO/rGO/Ag/AgBr) was synthesized by hydrothermal and photo-reduction process. Comparing with pure Zn 2 SnO 4 (ZTO), adding reduced graphene oxide (rGO) effectively improved electrons transfer efficiency. Notably, the addition of Ag/AgBr not only broaden the visible light response range of ZTO, but also accelerated the separation of photo-generated electron-hole pairs, and constructed all-solid-state Z-Scheme heterojunction . Meanwhile, DFT calculation showed that Ag metal on rGO surface could act as active site for organic dyes degradation . Moreover, the addition of extra bias potential during photoelectrochemical process not only accelerate the migration of carriers, but also inhibit the recombination of photo-generated electron-hole pairs. Methylene blue (MB) could be effectively removed during photoelectrochemical reaction process, which was attributed to hydroxyl radical (•OH) and superoxide radical (•O 2 - ). In this work, Z-Scheme transfer pathway, assisted photoelectrocatalytic technology, is a feasible strategy for improving catalytic performance.
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Journal of Industrial Textiles
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2022
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IF 2.926
Jing Han,Hai-Tao Ren,Ting-Ting Li,Bing-Chiuan Shiu,Yong-Gui Li,Jia-Horng Lin,Ching-Wen Lou
Visible light response PAN@Ag-Ag2O/Sch (PAN@AS, schwertmannite and polyacrylonitrile abbreviated as Sch and PAN) nanofibers with different mass ratios were synthesized by electrospinning technology and pH-induced precipitation reaction. X-Ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy analysis showed that the formation of Ag-Ag2O/Sch heterojunction and Ag-Ag2O nanoparticles were evenly distributed on the surface of Sch. The prepared nanofibers have high oxidative removal performance for As(III) under visible light. In the PAN@AS0.10 system, the total As removal percent can reach 90.96% after 120 min irradiation at pH 4.0. The scavenger experiments confirmed that the main active substances of the PAN@AS0.10 system were h+ and •OH. The high oxidation and removal performance of the PAN@AS0.10 composite for As(III) was attributed to the effective separation of photogenerated electron-hole pairs and high adsorption capacity of Sch for As under acidic conditions. This research provides a new material for the oxidation and removal of pollutants in water [such as As(III)] and also provides a research basis for the preparation of recyclable photocatalysts.
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Environmental Science-Nano
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2022
·Vol. 9
·期 3
·975-987
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IF 9.473
Ying Liu,Yucai Wan,Chuncai Kong,Pan Cheng,Qin Cheng,Qiongzhen Liu,Ke Liu,Ming Xia,Qihao Guo,Dong Wang
Engineering a highly accessible semiconductor with optimized physicochemical structure for efficient photocatalysis under visible light is never-ending. Herein, a facile route was developed to fabricate a caterpillar-like ZnO–C (ZC) hollow nanocomposite by directly pyrolyzing Zn-BTC MOF microrods and nanorods, which have been previously synthesized via a rapid supersonic-assisted aqueous reaction at room temperature. It is demonstrated that the ZC nanorods radically grow on the surface of the hollow nanocomposite directly converted from MOF-microrods at 550 °C and form a caterpillar-like catalyst based on an oriented attachment mechanism. After in situ photo-reduction of AgNO3, the Ag–ZnO–C (AZC550) nanocomposite catalyst possesses ultrahigh photodegradation turnover frequency (TOF) values towards methyl blue (3.00 × 10−3 mol mol−1 min−1), 4-nitrophenol (0.14 × 10−3 mol mol−1 min−1) and amoxicillin (3.43 × 10−3 mol mol−1 min−1), as well as a photo-inactivation activity of 6.25 × 105 cfu mg−1 min−1 towards E. coli, outperforming most state-of-the-art catalysts reported thus far. The ameliorated photocatalytic performance and recyclability can be assigned to the synergistic effects between the Zn–C hierarchical nanoarchitecture and Ag-NPs. This work provides a new approach for the design of efficient solar photocatalysts.
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ACS Applied Nano Materials
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2022
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IF 6.14
Hua Cheng,Siqi Liu,Ruiqi Wang,Wei Zhang,Rui Pan,Zhe Li,Yi Gong,Fangkuo Wang,Rui Hu,Jianjun Ding,Xian Zhang,Chen Lin,Jianying He,Xingyou Tian
The fabrication of thin composite films incorporating metal-based fillers with a delicate structure to achieve high electromagnetic interference shielding effectiveness (EMI SE) at low metal content remains a great challenge. In this work, benefiting from the excellent electrical conductivity of Ag nanoparticles, Ag nanoparticle-coated polystyrene (PS@Ag) microspheres with a large PS core were selected as electrically conductive fillers, and the volume exclusion effect guaranteed the construction of an electrically conductive network with low silver loading. A spontaneous process to construct a segregated laminar structure with a three-dimensional electrically conductive network happened with the assistance of a gravity-driven effect. The flexible thin films with a low amount of silver exhibited outstanding EMI SE per unit thickness (SE/d). To further investigate the effect of the structure on the EMI SE efficiency, it is found that the alternate interfaces play a critical role in enhancing shielding performance by stacking multiple films compared to the bulk films obtained by casting. The EMI SE for an only 0.3 mm triple-piece stacking film with 6.3 wt % Ag loading could reach 55.3 dB compared to 37.2 dB for the triple-thickness casting film. Using the stacking process results in easy accessibility for tailored composites with the desired EMI SE, which supplies a new strategy for the design of shielding materials in the next-generation electronics.
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Catalysts
·
2022
·Vol. 12
·期 5
·479
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IF 4.501
Xiangxiang Li,Shuling Chang,Yanting Wang,Lihong Zhang
The selective and effective conversion of CO2into available chemicals by electrochemical methods was applied as a promising way to mitigate the environment and energy crisis. Metal silver is regarded as an efficient electrocatalyst that can selectively convert CO2into CO at room temperature. In this paper, a series of coral-like porous Ag (CD-Ag) catalysts were fabricated by calcining silver-carbonaceous microsphere (Ag/CM) precursors with different Ag content and the formation mechanism of CD-Ag catalysts was proposed involving the Ag precursor reduction and CM oxidation. In the selective electrocatalytic reduction of CO2to CO, the catalyst 15 CD-Ag showed a stable current density at −6.3 mA/cm2with a Faraday efficiency (FE) of ca. 90% for CO production over 5 h in −0.95 V vs. RHE. The excellent performance of the 15 CD-Ag catalysts is ascribed to the special surface chemical state and the particular nano-coral porous structure with uniformly distributed Ag particles and pore structure, which can enhance the electrochemical active surface areas (ECSA) and provide more active sites and porosity compared with other CD-Ag catalysts and even Ag foil.Keywords:carbon dioxide reduction;silver;carbonaceous microsphere;carbon monoxide;electrochemical
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JOURNAL OF BIOMATERIALS APPLICATIONS
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2022
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IF 2.712
Lumin Li,Xiaofeng Ji,Kai Chen
The rapid development of flexible electronic technology has led to the in-depth study of flexible wearable sensors to achieve accurate sensing under different external stimuli. However, it is still a huge challenge to develop hydrogel-based wearable skin-like sensors with super ductility, high sensitivity, and self-healing properties. Herein, the Ti3C2 type of MXene was synthesized, and the Ag/MXene nanocomplexes were incorporated into polyvinyl alcohol-borax matrix to construct a novel composite hydrogel as the multifunctional nanofillers, which could bring both improved properties and novel functionalities. The Ag/MXene-Poly (vinyl alcohol) (PVA) hydrogel displayed integrated merits of highly strain sensitive (GF = 3.26), self-healing (within 10 min, 91% healing efficiency), and excellent antibacterial activity. The hydrogel could be assembled into a wearable skin-like sensor to monitor human movement, including large deformations (finger, elbow, wrist, and knee bending) and tiny deformations (mouth’s movement and throat vocalization) in real time. Therefore, this work shed a new light on the development of flexible wearable skin-like sensors for the personalized healthcare monitoring, human–machine interfaces, and artificial intelligence.
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