APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Chen Yang,Hongyan Zhang,Haiyang Zhang
A high-performance ammonia (NH 3 ) gas sensor based on Au nanoparticles (AuNPs) modified CdS (Au/CdS) was synthesized by hydrothermal method, and the sensing mechanism of Au/CdS was studied by first-principles based on density functional theory (DFT). Experimental results show that the addition of AuNPs can effectively enhance CdS-based NH 3 gas sensor performance. Au/CdS sensor exhibits high response (16580), short response/recovery time (2.25 s/1.25 s), and low limit detection (500 ppb), good repeatability and stability. Because AuNPs can effectively increase the generation of sulfur vacancies on the surface of CdS, increasing the amount of chemisorbed oxygen and providing more active sites for NH 3 . Furthermore, the good conductivity of AuNPs promotes the separation and transport of carriers on CdS surface, thereby improving the gas sensing performance. DFT calculations indicate that the ionization energy of Au is less than that of Cd, which causes some Cd atoms to lose their coordination with S atoms and increase sulfur vacancies on the surface of CdS. In Au/CdS sensors, sulfur vacancies accelerate the cleavage of NH 3 , and resulting electrons participate in charge transport, thereby enhancing the adsorption energy. This study introduces a new method for fabricating high performance NH 3 sensor based on CdS rich in sulfur vacancies.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yifan Liu,Yuling Lin,Ying Chen,Jianhui Huang,Yuancai Lv,Xiaoxia Ye,Chunxiang Lin,Guifang Yang,Minghua Liu
Here, valonia tannin and sulfhydryl functional groups were added to the cellulose aerogel from waste textiles to form a thiol-modified tannin-immobilized cellulose-based aerogel (TVTCA) with selective adsorption and outstanding reducing properties. This aerogel was then utilized to recycle Au(III) in the water. The resulting 3D TVTCA contained abundant -SH groups and phenolic hydroxyl groups and exhibited stable crystal structure and good thermal properties. TVTCA showed excellent Au (Ⅲ) adsorption performance (598.3 mg/g of maximum adsorption capacity) and strong reductivity (78 %). The adsorption process was conducted using both the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model. In addition, TVTCA displayed excellent anti-interference ability. Even though the coexisting ions concentration was as high as 100 mmol/L, TVTCA still owned a high Au adsorption capacity (178.91–224.14 mg/g) and selectivity factor (29.16–2629.34), which was much higher than valonia tannin-immobilized cellulose-based aerogel (VTCA). Furthermore, the recycling of Au with TVTCA mainly included adsorption and in-situ reduction processes. The mechanisms involved the electrostatic interaction and chelation effects, which were ascribed to the introduced sulfhydryl groups. Meanwhile, the in-situ Au reduction was mainly caused by the studies showing that the high adsorption capacity of TVTCA was owing to the phenolic hydroxyl groups on the introduced valonia tannin. All the findings would provide a new way to achieve the recycling of precious metals from wastewater by using valuable cotton waste.
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AICHE JOURNAL
·
2024
·
IF 3.5
Yifan Yan,Pengjie Hao,Yu Fu,Wangsong Chen,Qiwei Shi,Hua Zhou,Xianggui Kong,Zhenhua Li,Mingfei Shao,Xue Duan
Utilizing sustainable electrocatalysis to upcycle glycerol (GLY; the by-product of biodiesel) to lactic acid (LA; the key monomers for biodegradable polymer) is an efficient way to reduce the cost of biodiesel, which is also consistent with the waste-to-wealth principle. However, current research still suffers from issues of low LA selectivity (<80%), especially at high current density. Herein, we designed a cooperative catalyst by modifying BiO x nanolayers on gold nanoparticles (BiO x /Au), achieving high LA selectivity (82%) at high current density (226 mA cm −2 at 1.05 V vs. RHE), outperforming most of the reported works in the literature. We reveal that BiO x could promote the adsorption of the middle hydroxyl of GLY, which facilitates the formation of DHA and thus enables high LA selectivity. Moreover, the electron-deficient Au in BiO x /Au is responsible for the enhanced current density, which is more beneficial to generate reactive oxygen species (OH*). To further reveal the application potential of this electrocatalytic strategy, we realized that the conversion of crude GLY extracted from cooking oil to LA coupled with H 2 production using a membrane-free flow electrolyzer, demonstrating a sustainable fashion to convert biodiesel waste into high value-added product and H 2 fuel.
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Nano Materials Science
·
2024
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IF 12.6
Mirza Abdullah Rehan,Honghua Liang,Guiqiang Li
The construction of a well-defined and efficient Z-scheme heterostructure with enhanced photogenerated charge carriers and their rapid transfer is vital for realizing efficient photocatalytic hydrogen production, to achieve carbon neutrality. Herein, we study the H 2 evolution reaction by rationally constructing a hybrid Au-anchored UiO-66-NH 2 with localized surface plasmon resonance (LSPR) properties, embedded with ZnIn 2 S 4 /MoS 2 nanosheets. Interestingly, the synergistic effect of excellent heterojunction, tunes additional catalytic active sites, provides effective separation of photogenerated charges at the junction interface and establishes a dedicated microenvironment for the boosted electron transfer. Notably, the optimized hybrid photocatalyst (Au 6 @U6N) 15 /ZIS/MS 5 exhibits highly efficient H 2 generation of 58.2 mmol g −1 h −1 , which is almost 16 and 1.5 folds of the pristine ZIS and MS/U6N/ZIS, correspondingly. It has an apparent quantum efficiency of 19.6% at a wavelength of 420 nm, surpassing several reported MOF-based ZnIn 2 S 4 photocatalytic H 2 evolution activities. Significantly, this research provides insights into the design of interface-engineered plasmonic MOF with layered encapsulated heterostructures that elucidate the role of plasmonic LSPR effect and efficiently regulate the charge transfer with enhanced microchannels, hence boosting the visible-light-driven photocatalytic activity for realizing efficient green energy conversion.
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Advanced Materials Technologies
·
2025
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IF 6.2
Jingwen Liao,Wenya Li,Jingna Zhao,Zehui Zhao,Kai Ren,Wei Cheng,Yongyi Zhang,Xiaohua Zhang,Qingwen Li
Absorption-dominated electromagnetic shielding materials play a critical role in modern high-frequency, sensitive, and complex electronic systems due to their abilities of minimizing secondary interference and electromagnetic pollution. Carbon nanotube (CNT) assembly material is a kind of excellent absorption type shielding material, but the relatively lower electrical conductivity limits its shielding performance. Compositing CNT and metal together can effectively facilitate the merits of both materials. Here, an expansion-based in situ composition strategy is proposed to embed Au particles into CNT network and lead to CNT/Au fiber. The obtained composite fiber has the characteristics of uniform distribution of Au particles, light weight, and also exhibits higher mechanical and electrical performance. The addition of Au particles plays an important role in enhancing the shielding performance (electromagnetic shielding effectiveness up to 85 dB, A/R up to 2.36) of fabrics, demonstrating an obvious absorption-dominated feature. Moreover, the CNT/Au fabric also demonstrates excellent environmental stability.
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MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Zeyu Wu,Linghao Zhao,Yangkun Sun,Yufeng Zhang,Yuerong Wang,Min Zhang,Hongyang Zhang,Fanghong Ning,Ping Hu
Hydrogen peroxide (H 2 O 2 ), a type of reactive oxygen species (ROS) produced by cells, plays a significant role in various physiological processes. Its abnormal concentrations in human body are closely associated with cellular damage as well as a variety of major diseases. Consequently, sensitive and accurate detection of cellular H 2 O 2 concentration is of great significance in evaluating the degree of intracellular oxidative stress in human cells. In this study, a novel heterogeneous nanomaterial, rGO@PDA@MXene-Au@COF, was designed for electrochemical-colorimetric dual-mode detection of intracellular H 2 O 2 , which enhances both peroxidase and electrochemical activities, achieving lower detection limits and broader linear ranges. ESR spectroscopy, EIS resistance analysis and computational simulation were employed to verify the mechanism of the activity enhancement, and the detection conditions were optimized. The methods were subsequently applied to the determination of H 2 O 2 in cells, yielding results of 1.69 × 10 −14 M H 2 O 2 /cell and 1.59 × 10 −14 M H 2 O 2 /cell for electrochemical and colorimetric detection of MCF-7 cells, and 1.67 × 10 −14 M H 2 O 2 /cell and 1.58 × 10 −14 M H 2 O 2 /cell of Hela cells, respectively. These results demonstrated high sensitivity and anti-interference capabilities, enabling quantitative detection of H 2 O 2 in complex cellular environments. Furthermore, the similarity in results between the two methods confirms their mutual accuracy and reliability. This work provided a novel approach for designing multifunctional nanomaterials and detecting H 2 O 2 in cells.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 8
·1-11
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IF 5.3
Bao Mingqiu,Huang Xinyu,Hao Yakai,Chen Huijin,Yue Ruirui,Xu Jingkun,Duan Xuemin
Ractopamine (RAC), illegally used in swine feed to promote lean muscle growth, seriously endangers human health (particularly children’s development), necessitating rapid and accurate monitoring of its residues in pork and derived products. In this work, the well-structured gold/poly(3,4-ethylenedioxythiophene) nanowires (Au/PEDOT NWs) were facilely synthesized via interfacial polymerization, which enabled the uniform loading of Au nanoparticles (Au NPs) on/in cross-linked PEDOT NWs. The component, structure, and morphology of Au/PEDOT NWs were confirmed by series of physical characterization. The Au/PEDOT NWs were used to modify the electrode to fabricate a concise RAC sensing platform, which provides outstanding sensing properties featuring a low detection limit (LOD) of 1.67 μM, wide linear response spanning from 10~200 μM, and a high sensitivity of 1.33 μA μM −1 cm −2 . Furthermore, by comparison with the detecting results of high-performance liquid chromatography (HPLC), this sensing platform achieved satisfactory recoveries for RAC detection in pork samples. The sensor represents a groundbreaking advancement for food safety by enabling rapid, ultrasensitive, and highly selective detection, providing technical support for on-site food safety detection, and promoting the widespread application of electrochemical sensing technique. Graphical
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CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Xiaojun Luo,Yang Fan,Xingju Li,Yunxin Zhang,Jiaxin Chen,Panjie Li
Rising gold demand calls for sustainable extraction methods that go beyond conventional mining-dependent hydrometallurgy and pyrometallurgy approaches, as these traditional methods are plagued by inefficiency, high costs, and significant environmental risks. Adsorption-based methods using materials such as activated carbon or metal-organic frameworks have emerged as alternatives but face limitations in selectivity, stability, and mass transfer efficiency. This study introduces a sulfur- and nitrogen-functionalized 1D covalent organic framework (COF) with a 4-c sql topology, designed to overcome these challenges. Unlike 2D/3D COFs, the 1D structure minimizes interlayer stacking and enhances active site exposure, enabling rapid Au(III) detection (via fluorescence/colorimetric dual sensing) and in situ reduction to Au(0) without external reductants. Leveraging Au–S/N bonds and H-bonding interactions, the material achieved a low detection limit (8.5 × 10 −9 M) and high adsorption efficiency in real-world scenarios, including river water and computer CPU leachates. The 1D COF's unidirectional electron channels and sulfur-rich moieties further improved selectivity and kinetics. This work demonstrates a dual-function platform for gold detection and recovery, offering a sustainable solution to mitigate e-waste hazards while advancing resource circularity. The findings highlight the potential of structurally engineered 1D COFs in precision metal recycling and environmental remediation.
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CHINESE CHEMICAL LETTERS
·
2025
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IF 8.9
Kang Liu,Ziping Wang,Yali Xie,Yongqi Wei,Wengang Liu,Ting Feng,Yong Liu,Haiguang Zhu,Xun Yuan
Solar-driven hydrogen peroxide (H₂O₂) production offers a sustainable alternative to the energy-intensive anthraquinone process, yet conventional photocatalysts suffer from poor selectivity and uncontrollable reaction pathways. Inspired by catechol oxidase enzymes, we design dopamine-grafted lipoic acid-protected gold nanoclusters (DA-LA-Au NCs) that shift photocatalytic active sites from the metal core to redox-active ligands. This ligand-centric architecture leverages dopamine’s reversible catechol/quinone interconversion to gate a biomimetic proton-coupled electron transfer (PCET) pathway, enabling exclusive 2e⁻ oxygen reduction with near-100% H₂O₂ selectivity while completely suppressing superoxide radical (·O₂⁻) generation. Transient absorption spectroscopy and molecular dynamics confirm enhanced electron transfer kinetics and O₂ enrichment at ligand sites. Encapsulation in ZIF-8 stabilizes the system, achieving a record H₂O₂ yield of 1198 μmol/L under visible light without sacrificial agents and a 0.39% solar-to-chemical conversion efficiency, surpassing most reported photocatalysts. This "ligand-as-catalyst" strategy merges enzymatic precision with nanocluster functionality for sustainable oxidant synthesis.
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CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Ming-Xuan Shi,Han-Yue Yang,Xue Xiao,Pu-Jun Jin,Yu Chen
Addressing the dual challenge of water pollution and high energy costs in treatment processes, this study reports an integrated electrochemical system engineered for simultaneous pollutant removal and resource recovery. We designed a bifunctional electrocatalyst, plasmonic Au nanoparticles loaded on MoS 2 nanoflowers (Au@MoS 2 NFs), and implemented it in a novel reactor configuration that couples nitrite reduction (NO 2 RR) with sulfur ion oxidation (SOR). This process design is the key to overcoming the primary economic barrier of traditional electrolysis: by replacing the energy-intensive oxygen evolution reaction (OER) with thermodynamically favorable SOR, we achieve an operational voltage reduction of 1.48 V. Further process optimization was achieved by integrating solar energy, where plasmonic enhancement boosted ammonia yield to 4.9 mg h −1 mg cat −1 (~100 % FE), a 25 % increase that lowers the overall energy input. This work demonstrates an economically attractive engineering solution, transforming a waste stream into valuable ammonia and sulfur with significant energy savings and robust stability under practical, intermittent conditions.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei Zhou,Wenwei Zhang,Xueqin Ma,Haichen Lai,Xingguang Zhang
Metal-zeolites catalysts are of great importance in selective organic conversions. Zeolites possess features of highly-ordered porous network, adjustable acidic properties (Brønsted/Lewis), spatial nanoconfinement effects, unique shape selectivity and the strong (hydrothermal-) stability. The role of zeolite hydroxyl (z-OH) groups, such as bridging ones in Si-O(H)-Al (B acids) and terminal ones in Al-OH and Si-OH (silanols), in catalysis is an interesting topic, particularly when they are not catalytic active sites, while they affect the catalytic performances. This study comprehensively investigated series of Au/USY catalysts in the selective oxidation of benzyl alcohol to benzaldehyde and clarified the dominating contributions of Al-associated z-OH groups to affecting catalytic conversions and selectivity via altering the Si/Al ratio and reducing z-OH groups by amorphous silica species derived from diethoxydimethylsilane under high-temperature calcination. The catalysts were characterized by XRD, BET, TEM, XPS, UV/Vis, FT-IR and in-situ DRIFT to investigate crystal structures, textural properties, morphologies, size distribution, chemical state of gold, acidity, and adsorptive properties. The experimental results proved that zeolites with a higher amount of z-OH groups tuned by Si/Al ratios or by diethoxydimethylsilane silylation exhibited higher catalytic activity because of the adsorption effect. Finally, a possible mechanism was discussed based on the experimental results and literature.
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TALANTA
·
2024
·
IF 5.6
Li Wang,Jianli Sun,Xiaoxuan Wang,Milan Lei,Zengliang Shi,Lei Liu,Chunxiang Xu
Rapid and sensitive detection of multiple biomarkers by lateral flow immunoassay (LFIA) remains challenging for signal amplification for commonly used nanotags. Herein, we report a novel LFIA strip for visual and highly sensitive analysis of two cardiac biomarkers based on functionalized gold nanoparticles @ polystyrene microsphere (Au@PS）microcavity as surface-enhanced Raman scattering (SERS) tags. Antibody-modified Au@PS was designed as a SERS label. The evanescent waves propagating along the surface of the PS microcavity and the localized surface plasmons of the gold nanoparticles were coupled to enhance the light-matter interaction synergistically for Raman signal enhancement. In this strategy, the proposed Au@PS SERS tags-based LFIA was carried out to quantify the content of the heart failure and infarct biomarkers synchronously within 15 min and get the limits of detection of 1 pg/mL and 10 pg/mL for cardiac troponin I (cTnI) and N-terminal natriuretic peptide precursor (NT-proBNP), respectively. The results demonstrated 10–20 folds more sensitivity than that of the standard colloidal gold strip and fluorescent strip for the same biomarkers. This novel quantitative LFIA shows promise as a high-sensitive and visual sensing method for relevant clinical and forensic analysis.
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