Surfaces and Interfaces
·
2026
·
IF 6
Aidi Xie,Wusong Geng,Chun Chen,Yunxia Zhang,Haimin Zhang,Guozhong Wang
A mesoporous SiO 2 -supported Ag catalyst co-modified with B 2 O 3 and amino groups (B/Ag@NH 2 −MS) was synthesized through the grafting of amino group onto silica and subsequent impregnation with 10 wt.% Ag and 5 wt.% B 2 O 3 . Density functional theory (DFT) calculations and Bader charge analysis showed that boron (B) doping triggered extensive electronic changes in the modified support. It implied that B atoms gained a partial positive charge, showing Lewis acidic nature, while nearby Ag atoms had a partial negative charge. This electronic redistribution led to a downward movement of the Ag d -band center and a decrease in the work function, which in turn modulated the binding energies of adsorbates and reduced the desorption barrier of MG. Such dual-site cooperation strengthened the adsorption and polarization of the DMO carbonyl group at the adjacent Ag and B sites, thus promoting the activation of the C = O bond. Moreover, the anti-sintering capacity of Ag nanoparticles could be ascribed to their efficient stabilization mechanism, resulting from the synergistic action of oxygen-bridged B/O/Ag species and –NH 2 functional groups.Consequently, it is noted that the catalyst is able to maintain a conversion of about 99% DMO and a selectivity of about 94% MG, and it was able to maintain a conversion rate of over 96% for >350 h. These observations highlight a dual-site electron synergy strategy for developing very active and long-lasting Ag catalysts for ester hydrogenation.
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高影响因子
MOLECULES
·
2026
·Vol. 31
·期 10
·1737
·
IF 5.1
Juan Xu,Jinju Ma,Lanxiang Liu,Baoshan Tang,Hong Zhang,Wenwen Zhang,Zhengjun Shi
Bamboo is a renewable and fast-growing biomass resource with limited utilization and service life owing to its susceptibility to mold. Conventional nano-modification methods, particularly two-step approaches, are limited by weak interfacial bonding between nanoparticles and the bamboo substrate, complex processing, and an inability to simultaneously enhance antimildew performance and dimensional stability. To address these limitations, we developed a one-step hydrothermal method involving the use of tannic acid (TA) for in situ fabrication of ZnO/TA/Ag composite particles on bamboo surfaces. Process parameters were optimized to 100 °C, 10 h, and a zinc acetate-to-tannic acid molar ratio of 20:1. The modified bamboo was characterized using Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy coupled with energy-dispersive spectroscopy, and thermogravimetric analysis. We demonstrated that ZnO/TA/Ag composite particles were successfully loaded onto the bamboo surface, thus improving the all-around performance of the bamboo simultaneously. Antimildew activity against Aspergillus niger and Penicillium citrinum increased from grade 4 in untreated bamboo to grades 1 and 0, respectively; water absorption decreased by 52.85%, and anti-swelling efficiency reached 30.41%, indicating improved mold resistance and dimensional stability. Thus, our technique could serve as a green and efficient one-step in situ modification strategy for high-performance functionalization of bamboo, making it suitable for applications in humid outdoor and indoor environments.
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PubMed
高影响因子
Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
·
2019
·
IF 2.17
Tehseen Yaseen,Hongbin Pu,Da-Wen Sun
In this study, a surface-enhanced Raman scattering (SERS) approach based on silver-coated gold nanoparticles (Au@Ag NPs) was established for rapid detection of multiple organophosphorus pesticides (triazophos and methyl-parathion) in peach fruit. The Raman enhancement of Au@Ag NPs for detecting organophosphorus pesticides was stronger than those of single Ag and Au NPs. It was revealed that core size of Au NPs was a critical parameter affecting the enhancement of Raman signals by joining two plasma resonance absorptions. The Au@Ag NPs with 26 nm Au core size and 6 nm Ag shell thickness showed significant Raman enhancement, especially by the creation of hot spots through NPs aggregation induced by connection between Au@Ag NPs and target molecules. The detection limits of triazophos and methyl-parathion in peach were 0.001 mg/kg. Good recovery (93.36 to 123.6 %) and high selectivity of the SERS activity allowed excellent precision for the detection of the triazophos and methyl-parathion in peach. Compared to earlier studies, the current approach was rapid, inexpensive and simple without lengthy sample pre-treatment. This study revealed that the proposed method could be employed for the analysis of trace contaminants such as triazophos and methyl-parathion in many food matrices.
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Catalysts
·
2019
·Vol. 9
·期 7
·568
·
IF 3.444
Juan Du,Xinyu Liu,Jiaxin Zhang,Yucun Liu,Enwei Zhu,Guangbo Che,Mingjun Jia
A simple and efficient approach was developed for synthesizing a metal-organic polycatenated compound composed of Ag-triazole complexes and phosphomolybdic acid (PMA) clusters. The hybrid compound, namely {[Ag2(trz)2] [Ag24(trz)18]}[PMo12O40]2(1) (trz = 1,2,4-triazole), showed high catalytic activity, selectivity and recyclability for the epoxidation of olefins with molecular oxygen as the oxidant and isobutyraldehyde as the co-reagent, and could even work well under ambient conditions. The special polycatenane framework, formed by interlocking [Ag24(trz)18]6+nanocages, provides suitable space for filling the PMA clusters. The existence of multi-interactions, including π-π stacking, Ag-Ag interactions, and electrostatic interactions, should play a determinative role in fabricating the catalytically active and stable PMA-based polycatenane catalyst for aerobic epoxidation of olefins.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 47
·21693-21708
·
IF 4.682
Du Jinyan,Xu Na,Wang Chaofeng,Shu Qin,Xu Qidi,Zhang Ping,Zhuo Shujuan,Zhu Changqing
Novel red-emitting B, N, S-co-doped carbon dots (B,N,S-CDs) were prepared via a one-step hydrothermal carbonization. The obtained B,N,S-CDs are found to be responsive to the pH changes, i.e., the fluorescence intensities obviously change with the watershed of pH 7.4, accompanied by a blue-shift of the fluorescence emission wavelengths with the pH from 1 to 13. The surface state and size of the B, N, S-CDs are responsible for the fantastic responses. Furthermore, introduction of Ag + into the B, N, S-CDs resulted in fluorescence quenching and apparent changes of extinction value, thereby the quantitative assay can be successfully realized where a linear range of 0.1–400 and 0–700 μM with a detection limit of 38 and 107 nM is obtained, respectively. The mechanism might be due to static quenching and induced electron/energy transfer (ET) resulted from the formation of non-fluorescent complex. Strikingly, Ag + can be visualized via evident color changes from red to navy blue under UV light and from maroon to dark brown under sunlight, respectively. These findings indicate that the as-obtained B, N, S-CDs possess a great potential as a dual probe of pH and Ag + ions for biosensing. Graphical Abstract The red-emitting fluorescent B, N, S-CDs with a fantastic pH-sensitive feature, as a dual-mode nanosensor via colorimetric and fluorescence outputs, were applied to detect Ag + ions with the LOD of 107 and 38 nM, respectively.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 3
·2210551
·
IF 19.924
Hang Geng,Mengyang Wang,Songfan Wang,Dongxing Kou,Zhengji Zhou,Wenhui Zhou,Yafang Qi,Shengjie Yuan,Litao Han,Yuena Meng,Sixin Wu
Abundant intrinsic defects and defect clusters in Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells lead to severe nonradiative recombination and limited photoelectric performance. Therefore, developing effective method to suppress the detrimental defects is the key to achieve high-efficiency solar cell. Herein, a convenient two-step cooling strategy in selenization process is reported to suppress the Cu Zn and Sn Zn defects and defect clusters synergistically. The results show that rapid cooling during section from selenization temperature to turning temperature can inhibit the volatilization of Sn and restrain the corresponding Sn-related defects, while slow cooling during the subsequent temperature section can reduce the degree of Cu-Zn disorder. Benefitting from the synergistic effect of two-step cooling, a significantly lowered concentration of Sn Zn and Cu Zn defect and their defect clusters [2Cu Zn +Sn Zn ] in absorber is observed, meanwhile, a reduced band tailing effect and promoted carrier collection efficiency of the photovoltaic device is obtained. Finally, a device with improved open-circuit voltage ( V oc ) of 505.5 mV and efficiency of 12.87% is achieved. This study demonstrates the impact of cooling process on defects controlling for the first time and provides a simple and effective new strategy for intrinsic defect control, which may be universal in other inorganic thin film solar cells.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xiao-han Pan,Jian-hua Zu,Jing-jie Diao,Yi Xue,Si-yu Liu
The aim of current work was to explore a new material for the fast, efficient and selective recovery of precious metal silver (Ag(I)) from electroplating effluents to alleviate its high consumption and mitigate its environmental pollution. In this study, the sulfydryl-rich covalent organic framework (COF-SH) was prepared by solvothermal method . Its Ag(I) adsorption performance was evaluated by batch adsorption experiments that the effects of initial Ag(I) concentration, ratio of adsorption dosage to solution volume, adsorption time and reacting temperature were studied. The isothermal data fitted well with the Langmuir model and the maximum adsorption capacity at 298 K was up to 609.89 mg/g. The adsorption rate was very fast almost achieving adsorption equilibrium within 16 min. The adsorption rate and adsorption capacity increased with the increase in reaction temperature. The perfect fitting with pseudo-second-order kinetic model indicated the adsorption process was dominated by chemisorption process. Weber–Morris intraparticle diffusion model divided the adsorption process into three stages and temperature had a positive correlation with the first stage, external surface diffusion . The thermodynamic fitting results suggested that the adsorption process was endothermic, disordered and spontaneous. In terms of application, COF-SH achieved highly selective adsorption of Ag(I) in simulated electroplating wastewater with coexistence of multiple metal ions , especially at high acidity (≥1 M HNO 3 ), and the increase in concentration of competing ions had no affects. In addition, 1 M HNO 3 + 0.3 M thiourea (TU) could be used as desorption agent with 100% Ag(I) desorbed from the adsorbed adsorbent COF-SH-Ag.
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高影响因子
Materials Advances
·
2022
·Vol. 3
·期 11
·4520-4525
·
IF 0
Yongqi Yin,Xiao Liu,Mengqi Wang,Shuang Li,Yan Chen,Ye Sun
Surface-enhanced Raman scattering (SERS) and metal-enhanced fluorescence (MEF) phenomena can significantly increase spectroscopic signals, allowing sophisticated biological detection to be realized. However, integrating SERS and MEF into a single plasmonic platform is still a challenge, since the optimized distance between the analyte and the metal is different for these two detection techniques. Herein, we designed a three-dimensional (3D) electromagnetic field via decorating silver (Ag) nanoparticles on a zinc oxide (ZnO) nanorod arrays to overcome this limitation, and the ultrasensitive detection of Rhodamine 6G dye molecules at extremely low detection limits of 10 fM for SERS and 100 fM for MEF can be realized. The underlying enhancement mechanism investigated via finite-difference time-domain simulations revealed that the 3D electromagnetic field could overcome the quenching effect in MEF to achieve the simultaneous enhancement of the SERS and MEF signals. This work provides a way to apply 3D architecture to realize ultrasensitive SERS-MEF dual-mode detection.
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DOI
POLYMER
·
2022
·
IF 4.432
Baojie Dou,Jianwu Lan,Shiying Lang,Yazhou Wang,Lin Yang,Hongyu Liu,Yafang Wang,Anrong Yao,Shaojian Lin
Development of multifunctional materials for efficient treatment of complex effluents containing water-insoluble oils and water-soluble dyes is highly desired. In this work, a multifunctional Ag/AgCl decorated CO 2 - responsive cotton membrane (Ag/AgCl@PCM) was successfully fabricated for simultaneous or successive removal of oils and dyes (both cationic and anionic dyes). Through achieving protonation and deprotonation in response to the CO 2 , the as-prepared Ag/AgCl@PCM could reversibly switch from superhydrophobic (uncharged) state to superhydrophilic (charged) state. Moreover, the Ag/AgCl endowed the Ag/AgCl@PCM with visible light photocatalytic activity . Based on these ingenious features, the as-prepared Ag/AgCl@PCM could bidirectional separation of various oil/water mixtures with high separation efficiencies (≥97.50%), accompanying with satisfactory fluxes, due to controllable wettability upon CO 2 stimulation. Moreover, the as-prepared Ag/AgCl@PCM exhibited stable oil/water separation property, even under various adverse environmental conditions. Meanwhile, the Ag/AgCl@PCM could eliminate the dyes in wastewater through adsorption for anionic dyes and photocatalysis for cationic dyes. The results presented that MB (anionic dye) could be efficiently removed by the Ag/AgCl@PCM under both static and dynamic states in the presence of CO 2 . The maximum static adsorption capacity of the Ag/AgCl@PCM toward MB reached 2168.47 mg g −1 with a fast adsorption rate (12 min of adsorption equilibrium time). For the removal of cationic dyes, the photo-degradation efficiency of the Ag/AgCl@PCM toward RhB (cationic dye) was up to 94.30% within 6 h. Most importantly, the as-prepared Ag/AgCl@PCM exhibited photo-induced self-cleaning performance due to the existence of Ag/AgCl, which endowed it with excellent recyclability. Additionally, the as-prepared Ag/AgCl@PCM displayed outstanding antibacterial activity . In summary, the Ag/AgCl@PCM could be viewed as a satisfactory material for oil/water separation and dyes removal and exhibits great potential in wastewater remediation.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Dong Li,Ran Tian,Shiyu Kang,Xue-Qiang Chu,Danhua Ge,Xiaojun Chen
Ag nanoparticles (Ag NPs) with high electrocatalytic activity are of great significance for electrochemical sensors. Nanostructures as scaffold can solve aggregation problem of Ag NPs so that to ensure the stability. In this work, Ag NPs immobilized on FeS 2 nanoprisms (Ag/FeS 2 ) were prepared via an in-situ photocatalytic reduction approach. The enlarged electrode effective surface area, enhanced electron transfer and the synergic impact between Ag NPs and FeS 2 lead to an enhanced catalytic activity. The electrochemical detection method exhibited great performance of low detection limit (0.6 μM), wide linear range and high sensitivity (244.4 μA mM −1 cm −2 ) for H 2 O 2 . Moreover, Ag/FeS 2 as a peroxidase mimic can catalyze oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue product (oxTMB) by H 2 O 2 , which achieved effective detection of H 2 O 2 with a 3.0 μM detection limit. A promising way was successfully eatablished to perform the quantitation of H 2 O 2 in serum and beverage.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Hong Zeng,Hongli Yang,Yue Tang,Xiaojuan Niu,Yuangen Wu
A facile and simple colorimetric biosensor was first established for paraquat (PQ) detection based on the aptamer-enhanced oxidation process of 3,3′,5,5′-tetramethylbenzidine (TMB) by Ag + . The study confirmed that the interaction of PQ-15 aptamer with Ag + accelerates the electron transfer from the aptamer-Ag + complex to dissolved oxygen, which enhances the release of superoxide anion radicals (O 2 ̇ − ) and facilitates the catalytic oxidation of the chromogenic substrate. PQ-15 aptamer will preferentially bind to PQ molecules, resulting in no further enhancement of the catalytic activity of Ag + . Molecular docking results revealed that the PQ molecules are attached to the stem-loop region of the PQ-15 aptamer through σ-π conjugation interactions. The proposed method is simple that only contains Ag + and corresponding aptamer. The limit of detection (LOD) of the constructed colorimetric biosensor for PQ detection was determined to be 16.5 μg·L -1 , belowing the maximum residue limit in fruits and vegetables set by the EU. Moreover, the colorimetric biosensor showed excellent selectivity and anti-interference properties, which was validated for detecting PQ residues in several typical agricultural and water samples.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Na Zhang,Shuangshuang Peng,Zhiyu Liu,Ye Li,Ju Huang,Jing Li,Hongri Wan,Shuai Zhou,Zhaojian Gao,Teng Chen
In this paper, Ag NPs-decorated magnetic Fe 3 O 4 @PDA nanocomposites have been successfully prepared. The spherical Fe 3 O 4 nanoparticles with an average size approximately 340 nm were modified by dopamine under mild conditions. Dopamine was self-polymerized surrounding Fe 3 O 4 nanoparticles and transformed into poly dopamine (PDA) layers. The PDA-encapsulated magnetic (Fe 3 O 4 @PDA) nanoparticles could in-situ reduce silver ammonium ions by the catechol groups in PDA layers. The Ag NPs with an average size ranging from 20 nm to 36 nm were densely decorated on the thin PDA shell. The resultant Fe 3 O 4 @PDA-Ag nanocomposites were employed as highly efficient catalysts for the reduction of different organic pollutants in the appearance of sodium borohydride. The Fe 3 O 4 @PDA-Ag nanocomposites also demonstrated extraordinary cycling stability when the catalyst was recycled several times for the reduction of MB. The antimicrobial tests indicated Fe 3 O 4 @PDA-Ag nanocomposites could efficiently prohibit the growth of microorganism, including various bacteria and fungi. The minimal inhibitory concentrations (MIC) for Fe 3 O 4 @PDA-Ag nanocomposites against different bacteria and fungi were also determined. The excellent catalytic activity, magnetic recyclability, and antimicrobial performance make Fe 3 O 4 @PDA-Ag a feasible candidate for the remediation of wastewater which contains multiple water soluble organic pollutants and pathogenic microorganism.
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高影响因子
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