Environmental Science-Advances
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2024
·Vol. 3
·期 5
·763-775
·
IF 3.5
Youmei Xu,Yuchao Chen,Mengxia Wang,Yufei Shu,Siyu Cao,Zhongying Wang
Nitrophenol wastewater treatment and extracting and reusing precious metals from electronic wastewater have recently gained considerable attention. In this study, polyaniline-based membranes showcased remarkable gold recovery capability from electronic wastewater, effectively reclaiming 100% of gold on the membrane surface even in the presence of competing metal cations. The prepared Au@PmPD membrane, characterized by its high specific surface area and abundant Au nanoparticles (NPs), demonstrated excellent catalytic activity and stability, maintaining near 100% conversion efficiency in reducing 4-NP to 4-AP in the presence of NaBH4 over extended durations. Compared with the conventional physical mixing method, our in situ formation of the Au@PmPD membrane highlights the superior distribution of Au NPs and active sites for enhanced catalytic efficiency. It eliminates the need for additional steps to load Au NPs onto the membrane, resulting in a more straightforward and efficient process. Overall, this research provides a sustainable approach to repurposing waste into precious resources and offers a promising solution for the efficient treatment of persistent organic pollutants in wastewater, aligning with the principles of a circular economy.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Feng Gao,Yanjiao Wang,Minyue Wang,Chengcheng Wang,Tianwei Wang,Jingguo Wu,Qingbin Ni,Baoliang Sun,Jingyi Sun,Ying Wang
Traumatic brain injury (TBI), serving as a global health problem, is the primary cause of death and disability. However, the lack of a simple, accurate, and rapid method to diagnose and distinguish the injury severity of TBI in the acute phase and further improve the prognosis has been plaguing clinicians. To solve this problem, a highly sensitive surface-enhanced Raman spectroscopy (SERS) sensor, which was based on gold nanorod (AuNR) arrays, has been designed for the quantitative determination of TBI biomarkers. To create this effective SERS sensor, the AuNRs were fabricated via optimizing the particle morphology and, by evaporative self-assembly, optimizing AuNRs were assembled on microsilicon wafers to form AuNR array platforms with an enhancement factor of 1.24 × 106 and a limit of detection reaching 10–2 fg·mL–1. The ideal SERS sensors were further proven to have excellent sensitivity and reliability after being employed to analyze the various levels of S100β and IL-10 both in animal model blood samples and human blood samples. All results revealed that our biosensors can be a promising strategy for point-of-care clinical diagnosis and TBI severity distinction.
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Advanced Optical Materials
·
2025
·
IF 7.2
Mengqi Yang,Yuchen Sun,Xiaonan Wang,Jia Wang,Yongwei Liu,Ailing Zhang,Jinglin Shen,Wei Qi
Light-harvesting is an indispensable process in photosynthesis, and researchers have been exploring various structural scaffolds to create artificial light-harvesting systems. Herein, a light-harvesting system (LHS) is constructed by AuNCs. First, ionic liquid 1-Dodecyl-3-methylammonium bromide (C 12 mimBr) and Ba 2+ are used to co-assembly with 6-aza-2-thiothymine (ATT) modified AuNCs to get ATT-AuNCs/C 12 mimBr/Ba 2+ (M-AuNCs) with network superstructures and improved emission efficiency. This makes M-AuNCs applicable for aqueous LHS. Furthermore, the green-emitting network serves as energy donors, and red-emitting positive dyes (rhodamine B) act as acceptors. An efficient energy transfer process occurs between them with an energy transfer efficiency of 94.1%. Significantly, sequential energy transfer can also be realized with the further addition of deep-red emitting dye (sulforhodamine 101). Notably, the system can only be constructed by M-AuNCs instead of mono-dispersed ATT-AuNCs. Based on this, a FRET-triggered logic gate is established, in which C 12 mimBr and Ba 2+ can be considered as energy switches to turn on/off the logic gate. Therefore, this work not only fabricates an AuNCs-based LHS through sequential energy transfer, but also develops a FRET-triggered logic gate, which has potential application in molecular recognition and information encryption.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ning Wang,Xiaole Qi,Fengyan Xiao
Covalent organic frameworks (COFs), due to their unique structure and morphology, manifest great potential as active substrates to support noble metals for sustainable catalytic applications. However, it is still a challenge for efficient and effective catalysis using these kinds of COFs-based catalysts. Here, black phosphorus (BP) nanosheets modified spherical COFs (SCOFs) were synthesized, followed by the immobilization of Au nanoparticles (Au NPs) to fabricate Au NPs/BP/SCOFs microspheres . The as-prepared Au NPs/BP/SCOFs microspheres were then filled in a column for the continuous catalytic reduction of 4-nitrophenol. A fast and highly efficient flow-through catalysis of 4-nitrophenol with a reduction efficiency of 99 % under the flux of 2500 L m −2 h −1 was obtained. Furthermore, a stable catalytic performance under flow-through process was exhibited with only 0.13 wt% of total Au NPs releasing after testing for 24 h. The strategy for designing COFs-based substrates with enhanced electron transfer and controllable morphology would develop a new route to promote the application of these kinds of COFs-based catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei Du,Zhihua Zhang,Jundi Wang,Nan Song,Xuezhi Duan,Xinggui Zhou
Propylene epoxidation by H 2 and O 2 to propylene oxide (HOPO), as a novel method for PO production, has attracted widespread attention due to its economic and environmental advantages. Acrolein is a notable byproduct arising in HOPO reaction over Au/TS-1 catalyst, and is traditionally thought to be exclusively formed on Au site through propylene oxidation. However, on the intraporous and external surface Au sites of Au-Ti catalysts, the HOPO reaction have been shown to proceed by different mechanisms, yet the effect of active sites distribution on acrolein formation is far from being understood. Herein, we found that the reaction orders in acrolein formation on Au/TS-1 catalyst (H 2 , 0.19; O 2 , 0.44; C 3 H 6 , 0.44) relative to Au/TS-1 with blocked pores (Au/TS-1-B) catalyst (H 2 , −0.36; O 2 , 0.61; C 3 H 6 , 0.52) were quite different, suggesting a variation in the reaction pathway on the catalysts with different Au locations. Moreover, it is found that PO can be converted to acrolein by O 2 on TS-1 zeolite, which is absent on TS-1-B zeolite without micropores. Consequently, acrolein formation on Au/TS-1 catalyst can proceed through two parallel pathways: propylene hydro-oxidation on Au site, and PO conversion by O 2 inside micropores. Furthermore, by designing and preparing the Au/TS-1 catalysts with different structures, the Au locations are closely related to acrolein formation mechanism and kinetic behaviors. This work provides kinetic insights into the acrolein formation pathways in the HOPO reaction on Au/TS-1 catalyst, and is helpful to the rational design and preparation of efficient catalysts with high selectivity.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yuchen Hou,Yongjiao Sun,Yimeng Dong,Bingliang Wang,Zhiyuan Lu,Zihan Wei,Zhaomin Tong,Wendong Zhang,Koichi Suematsu,Jie Hu
A series of Au NPs decorated hierarchical In 2 O 3 /SnIn 4 S 8 microcubes were prepared by in-situ growing SnIn 4 S 8 nanosheets on the surface of In 2 O 3 microcubes and followed by reducing Au NPs on the surface of the hierarchical composite. The gas sensing performance of the sensors based on the as-prepared materials were systematically assessed. And the results showed that coverage of SnIn 4 S 8 and introduction of appropriate amount of Au NPs improved the gas sensing response of In 2 O 3 toward NO 2 at room temperature (RT). In particular, the sensor fabricated with 3 wt% Au NPs decorated In 2 O 3 /SnIn 4 S 8 exhibited excellent selectivity (S NO2 /S other > 12.6), high response (155.65–7 ppm NO 2 ), low theoretical limit of detection (LOD, 21.43 ppb), fast response/recovery time (132/191 s), good anti-interference performance, as well as repeatability and stability. The outstanding sensing performance at RT might be associated with a synergistic effect of heterostructures and the spillover effect of Au NPs, which could enlarge the electron depletion layer and promote the adsorption and dissociation of oxygen and nitrogen dioxide molecules.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yating Zhu,Fan Wang,Jiayin Wang,Kaijia Xu,Yinyin Qian
The negative photoconductivity (NPC) effect is becoming an increasingly significant factor in the development of next-generation optoelectronics. However, research in the field of NPC-dominated optoelectronics remains in its infancy and frequently encounters challenges related to fabrication complexity, slow photoresponse speed, instability, and a limited spectral response range. Herein, a Cs 3 Bi 2 I 9 /Au heterostructure nanocomposite was prepared via a simple self-assembly process utilizing electrostatic interactions with Au nanoparticles (NPs) and lead-free Cs 3 Bi 2 I 9 nanoplates. The Cs 3 Bi 2 I 9 /Au nanocomposite-based photodetectors (PDs) demonstrate a broadband photoresponse (405–1550 nm), enhanced rise/fall times (27.2/40.0 µs), and reduced noise density (4.7 × 10 −13 A/Hz 1/2 at 1 Hz). In contrast to the positive photoconductivity (PPC) effect observed in colloidally synthesized Cs 3 Bi 2 I 9 nanoplate-based PDs, the NPC can be attributed to the decrease in photocurrent under light illumination during the processes of recombination and trapping of photogenerated carriers induced by the incorporation of Au NPs. These findings are expected to provide valuable insights into achieving high-performance NPC-dominated PDs by regulating the dynamics of photogenerated carriers in perovskite heterostructures.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yi-Hu Ke,Xiao-Mei Yu,Xue Wang,Hai Liu,Hong Yuan
Accurately controlling the directional activation of the primary and secondary hydroxyls and preventing the deep oxidation of oxygen-containing functional groups and the degree of C–C cleavage is still a great challenge for the selective oxidation of glycerol to glyceric acid. Hence, a series of bimetallic Au-Pt/M x O y C z catalysts (M = Cu, Co, Ce, Mn, Ni, Zn, Zr) were prepared using MOFs-derived transition metal carbon-based compounds as the support. These catalysts were utilized for glycerol catalytic oxidation to glyceric acid under basic conditions. The experimental date indicated that the type of transition metal makes a big difference on the conversion of glycerol and the selectivity of glyceric acid under the mild condition of 60 ℃. Among them, the Mn-modified carbon-based compound supported Au-Pt/Mn x O y C z catalyst has the best catalytic activity. After reaction for 2 h, the conversion of glycerol could reach 100 %, and the selectivity of glyceric acid could reach 57.3 %. The reason for the best activity of the Au-Pt/Mn x O y C z catalyst is that the particle size of active molecules is small, and the strong metal-support interaction produces more active sites. Specifically, Au-Pt/Mn x O y C z catalyst forms an Au-Pt alloy, and the synergy between alloyed Au-Pt and Mn &+ enhances the acidity of the catalyst, causing it to produce the most acidic sites and promoting the dispersion of metal nanoparticles. The strong basic site of the catalyst can promote Au-Pt electron transfer, which in turn changes the reducing properties of Au-Pt and enriches the oxygen vacancies of the catalyst. Therefore, the synergistic interaction between the acidic sites and strong basic sites promotes the activation of Au-Pt, which in turn promotes the reduction of Mn-based oxides and the activation and migration of oxygen. This work will offer some new recommendations for the development of MOFs-derived transition metal-based catalysts for the catalytic oxidation of bio-polyols under mild conditions.
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Analytical Methods
·
2018
·Vol. 10
·期 11
·1331-1338
·
IF 2.073
Huijuan Wang,Siyu Zhang,Shufang Li,Jianying Qu
Au@Pd core–shell nanoplates were synthesized successfully through the heterogeneous, epitaxial growth of Au on Pd nanoplates. The Pd nanoplates were prepared by reducing H2PdCl4 with PVP, and then served as seeds for the nucleation of Au atoms formed by reducing HAuCl4 with citric acid. Characterization of the as-prepared Au–Pd nanoplates by scanning electron microscopy revealed that a Au shell was formed around the Pd nanoplate. In order to avoid agglomeration, the Au@Pd nanoplates were loaded onto reduced graphene to give a Au@Pd/rGO nanohybrid, which exhibited excellent electrocatalytic activity towards the redox of hydroquinone (HQ) and catechol (CC) simultaneously. The linear detection ranges were 0.01–400.00 μM for HQ and 0.10–400.00 μM for CC, with detection limits of 0.01 μM for HQ and 0.10 μM for CC. Because of the excellent performance, lower detection, wider linear range, and better selectivity, the prepared Au@Pd/rGO nanohybrid has more potential applications and has an expected application in the electrochemical sensing field.
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IONICS
·
2017
·Vol. 24
·期 8
·2465-2472
·
IF 2.062
Sun Junyong,Gan Tian,Zhai Rui,Fu Wanqiu,Zhang Miaomiao
In the current study, a simple, recoverable, and stable sensor was developed based on SiO 2 spheres functionalized with 6-nm Au nanoparticles (SiO 2 @AuNPs). Fabrication procedures and analytical application of this sensor toward quantitative determination of diuron in the presence of interfering compound indole-3-acetic acid were verified by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and differential pulse voltammetry (DPV) methods. It has been observed that diuron oxidation at the surface of sensor occurred at a potential of about 1.09 V which was 210 mV higher than that of indole-3-acetic acid, confirming that this newly prepared sensor appeared to be a good platform for the selective detection of diuron. Moreover, DPV demonstrated a linear relationship from 0.20 to 55 μmol/L and a detection limit of 51.9 nmol/L for diuron. Finally, this sensor was utilized for the determination of diuron in complex vegetable samples.
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JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Zhuo Zong,Kebin Xu,Dongliang Li,Zhenghua Tang,Wei He,Zhen Liu,Xiufang Wang,Yong Tian
Bimetallic core-shell nanostructures have been gaining considerable research attentions recently, mainly thanks to their versatile applications in many fields, including catalysis, electrocatalysis, electronic, sensing and so on. Herein, we demonstrate a peptide templated Au@Pd core-shell structure for both oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER). By employing peptide sequence FlgA3 as surface capping agent, core-shell structure with Pd nanoparticles coated on the surface of Au nanoparticles were prepared. The Au@Pd core-shell structures demonstrated effective electrocatalytic activities toward both ORR and HER, whereas the catalytic activity was optimized by tuning the Pd-to-Au ratio. Among a series of samples tested, we discovered that the Au@Pd 1.0 sample exhibited the best ORR activity, superior to that of Pt/C and Pd/C, while its HER activity was also among the finest, close to that of Pt/C and Pd/C. The Au@Pd 1.0 sample also exhibited remarkable stability beyond Pt/C and Pd/C in both ORR and HER. Such intriguing electrocatalytic performances are attributed to the core-shell structure induced lattice strain. The results offer reliable pathway for designing peptide templated core-shell bimetallic nanostructures as dual or multiple functional electrocatalysts with excellent electrocatalytic activities and longevity.
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Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-11
·
IF 2.833
Zhang Zheng,Chen Yunsheng,Ding Jiayue,Zhang Chunlei,Zhang Amin,He Dannong,Zhang Yixin
Biocompatible 5-aminolevulinic acid/Au nanoparticle-loaded ethosomal vesicle (A/A-ES) is prepared via ultrasonication for synergistic transdermal photodynamic/photothermal therapy (PDT/PTT) of hypertrophic scar (HS). Utilizing ultrasonication, Au nanoparticles (AuNPs) are synthesized and simultaneously loaded in ethosomal vesicles (ES) without any toxic agents, and 5-aminolevulinic acid (ALA) is also loaded in ES with 20% of the entrapment efficiency (EE). The prepared A/A-ES displays strong absorbance in 600-650 nm due to the plasmonic coupling effect between neighboring AuNPs in the same A/A-ES, which can simultaneously stimulate A/A-ES to produce heat and enhance quantum yields of reactive oxygen species (ROS) by using 632 nm laser. In vitro transdermal penetrability study demonstrates that A/A-ES acts as a highly efficient drug carrier to enhance both ALA and AuNPs penetration into HS tissue . Taking human hypertrophic scar fibroblasts (HSF) as therapeutic targets, synergistic PDT/PTT of HS indicates that A/A-ES could enhance quantum yields of ROS by photothermal effect and localized surface plasmon resonance (LSPR) of AuNPs, resulting in a high level of apoptosis or necrosis. In a word, the prepared A/A-ES shows a better synergistic PDT/PTT efficiency for HSF than the individual PDT and PTT, encouraging perspective for treatment of HS.
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