SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Yangyang Wang,Shuwen Chen,Ronghao Liu,Lixin Zhang,Wenfeng Xue,Yanzhao Yang
The development of efficient ionic liquids (ILs) for disposable separation and recovery of various precious metals was of great importance, but still faced difficult challenges. A phase change temperature-controlled system composed of IL and HCl solution was developed for the extraction and separation of Au(III), Pd(II) and Pt(IV) from secondary resources. UCST (upper critical solution temperature)-type IL ([1,4,7-TMTA][Tf 2 N]) possessed outstanding selectivity of precious metals and the property of temperature-controlled phase transition. The ability of ILs to form solvated hydrogen bonds was confirmed by quantum-chemical calculation to be correlated with their corresponding UCST. Different experimental parameters were optimized to explore the extraction behavior of IL. It is noteworthy that homogeneous liquid-liquid extraction system (HLLE) constructed by UCST-type IL could significantly enhance the extraction kinetic of Au(III), Pd(II) and Pt(IV) by decreasing phase interface resistance. For Au(III), Pd(II) and Pt(IV), when the system temperatures were higher than 40 °C, 49 °C and 65 °C, the maximum values were 98.5%, 98.3% and 93.2% at the highest efficiency. In addition, the extraction mechanism of anion exchange was revealed by UV–vis, IR, NMR and LC-MS spectrometry. At last, Au(III), Pd(II) and Pt(IV) could be selectively separated from multi-metal solutions where impurity ions coexist by K 2 C 2 O 4 , NH 3 ·H 2 O and CS(NH 2 ) 2 /HCl, respectively. After 5 cycles, the extraction performance of [1,4,7-TMTA][Tf 2 N] maintained. In summary, this paper overcame the obstacle of slow kinetics of solvent extraction technology, and pointed out a way for polymetallic co-extraction and separation in HLLE system.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Manyi Gao,Fenyang Tian,Zhi Guo,Xin Zhang,Zhijun Li,Jing Zhou,Xin Zhou,Yongsheng Yu,Weiwei Yang
The proximity effect of adjacent metal sites has been widely investigated to modulate the electronic structure and catalytic activity of single atoms (SAs) catalysts, but is rarely reported between bicomponent metal nanoparticles (NPs) and SAs. Herein, we report an atom-like Pt@PtSAs co-catalyst on polymeric carbon nitride nanosheets (PCNS), where the mutual-modification effect exists in nucleus-like Pt NPs and diffuse PtSAs with sub-nanometer inter-site distances (Pt@PtSAs) to enhance the catalytic activities. The adjacent Pt NPs and PtSAs act as the modulators to tailor the d-band electronic states of each other through strong electronic metal-support interaction (EMSI) at PtSAs-PCNS-Pt NPs interface, resulting in enhanced intrinsic H 2 evolution activity of Pt@PtSAs sites. The EMSI also accelerates photoexcited electron transfer from PCNS to Pt@PtSAs sites to participate in H 2 evolution reaction. Consequently, the Pt@PtSAs-decorated PCNS exhibits an unexpectedly photocatalytic H 2 evolution rate up to 15.75 mmol g -1 h -1 under visible light, 1.9 times higher than that of PtSAs-decorated PCNS. This work sheds light on the synergistic mechanism among metal NPs and SAs and provides a valuable strategy to design highly efficient photocatalysts.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Yan Xue,Hongyu Li,Tao Wu,Hui Zhao,Yan Gao,Xixi Zhu,Qingyun Liu
Detecting of sulfur ions (S 2- ) in environment is critical to human health. In this work, a fast and convenient colorimetric sensing platform for S 2- was developed. In detail, Pt deposited on sea urchin-like CuCo 2 O 4 nanostructures (Pt/CuCo 2 O 4 ) was synthesized and demonstrated to possess enhanced peroxidase-like performance, similar to the natural horseradish peroxidase (HRP). Pt/CuCo 2 O 4 can catalyze colorless 3, 3, 5, 5-Tetramethylbenzidine (TMB) to be oxidized by H 2 O 2 into a blue product (oxTMB). When the above system encounters sulfur ions (S 2- ), the peroxidase-like activity of Pt/CuCo 2 O 4 is inhibited, accompanied with the color change of reaction solutions. On this basis, a colorimetric sensing platform for S 2- can be established. Kinetic experiments verified Pt/CuCo 2 O 4 possessed a higher affinity with substrate than that of HPR. The excellent peroxidase-like performance of Pt/CuCo 2 O 4 was attributed to two active species including hydroxyl radical (•OH) and superoxide radical (•O 2 - ) in the catalytic process. The linear range of the proposed sensing platform for S 2- was 0.5–10 μM as well as the low limit of detection is 85.9 nM, much lower than the World Health Organization regulations. The sensing platform had been successfully applied to the detection of S 2- in tap water and lake water, which provided a convenient method for detecting S 2- in wastewater.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Lanmei Gao,Houbing Zheng,Yuanlong Hu,Yi Zhong,Linhai Jiang,Yuanzi Wu,Fen Yan,Da Huang,Jianhua Li,Fang Zhang,Zhenyu Lin,Meishui Wang,Zuquan Weng
Bacterial infection of wounds is one of great concern to patients, and rapid and correct detection of bacterial infection is crucial to ensure accurate diagnosis and early intervention. Based on the principle that glucose can only be consumed by live bacteria, a fluorescent biosensor was constructed to detect four kinds of common infectious bacteria (Acinetobacter baumannii, Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus) in skin wounds, taking advantage of magnetic bead-aptamer for recognizing, sorting and enrichment, platinum nanoparticles for signal amplification . The linear detection range of AB, EC, PA and SA were 27– 8 × 10 6 CFU/mL, 10– 2.5 × 10 7 CFU/mL, 34– 2.5 × 10 7 CFU/mL and 10– 1.0 × 10 7 CFU/mL, respectively, and the limits of detection were 27 CFU/mL, 10 CFU/mL, 34 CFU/mL and 2 CFU/mL. Furthermore, all target bacteria in samples containing 8 × 10 8 CFU/mL of other interfering bacteria have been successfully identified and quantified. The proposed method was also successfully applied to the detection of bacterial infection in skin wounds of mouse and human, including the detection of separate bacterial infection as well as a coinfection. The recovery of this method was in the range of 90.161– 109.961%. Thus, this proposed method can be a promising candidate for rapid and convenient evaluation of infectious bacteria in point-of-care settings.
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ANALYTICA CHIMICA ACTA
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2021
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IF 6.558
Yiwei Liu,Xiaopeng Hu,Yide Xia,Faqiong Zhao,Baizhao Zeng
In this work, a novel signal on/off ratiometric electrochemical sensor for the selective detection of chlorpromazine (CPZ) was developed. The sensor was constructed by electrodepositing dual-monomer molecularly imprinted polymer (DMMIP) film on the surface of Pt/Co 3 O 4 nanoparticles modified glassy carbon electrode, using CPZ as template molecule, methylene blue and catechol as functional monomers. The copolymerization of two monomers increased the diversity of functional groups for binding template molecules, and enhanced stability. The quantitative detection of CPZ was performed by differential pulse voltammetry, using the peak current of poly (methylene blue) as reference signal and the peak current of CPZ as indicating signal. The results showed that the developed DMMIP sensor not only possessed high selectivity and sensitivity, but also exhibited satisfactory anti-interference ability. Under the optimum conditions, a linear detection range of 0.005–9 μmol L −1 (R 2 = 0.9962) was obtained, and the limit of detection was 2.6 nmol L −1 . Moreover, the sensor showed good reproducibility and stability toward CPZ detection. It was applied to detect CPZ in serum and pharmaceutical samples, and satisfactory recoveries (ranging from 95.3% to 108.0%) were achieved.
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PubMed
高影响因子
CATALYSIS LETTERS
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2023
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IF 2.8
Su Zheng,Sun Yu,Zhang Qi,Wang Jia,Zhou Wenqi,Zhou Suyin,Zhang Jinlong,Liu Yongdi,Zhou Liang,Lei Juying
Photocatalytic cofactor regeneration often encounters the problem of insufficient stability of reduced nicotinamide adenine dinucleotide hydrogen (NADH) regeneration due to the influence of reactive oxygen species. Here, we obtained Pt-loaded CdS nanorods (CdS NRs) with a one-dimensional (1D) rod-like structure by simple hydrothermal and photo-deposition methods. The yield of NADH improved by 52.54% within 40 min. Superoxide radical (·O 2 − ) had been proven to be the main reactive species that leaded to unwanted oxidation after NADH regeneration. After loading Pt, the formation of Schottky junctions between Pt and CdS NRs promoted the separation and migration of photogenerated carriers, resulting in a tendency of ·O 2 − to shift toward hydroxyl radical (·OH). ·OH produces additional intermediates in the oxidation of NADH compared to ·O 2 − , which inhibits the unwanted oxidation of NADH. Meanwhile, the conduction band position of Pt/CdS shifted positively and the ability to reduce O 2 was weakened, thus the ·O 2 − in the system was reduced, which weakened the oxidation of NADH and significantly improved the stability of NADH regeneration. These studies provide a new reference for applying loaded metal catalysts to the stable regeneration of NADH. Graphical Abstract
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Jie Chen,Guangxing Yang,Dongyan Shen,Qiao Zhang,Zhiting Liu,Feng Peng
Size effect of Pt nanoparticle (NPs) on electrocatalysis should be investigated in a wide size range and a narrow distribution. The surfactants used for size control were detrimental to exploring size effect. However, the largest size of Pt colloidal NPs was limited to ∼5 nm without surfactant, which is insufficient for investigating size effect. In this work, surfactant-free Pt colloidal NPs with a wider size range from 1.8 to 10.0 nm were synthesized by controlling the ratio of NaOH and Pt salts in the ethylene glycol by oil-bath heating. Assisted by the precise control of Pt size, the size effect on the electrooxidation of CO, methanol and ethanol was studied, showing that the optimal size varied from the specific catalytic reaction . The synthesis extended the upper limit of large Pt NPs by surfactant-free method, showing potentials in preparing other precious metal NPs with a wide size range.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2023
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IF 6.1
Xiaobo Zhang,Zhiru Li,Lin Hong,Xiuwen Wang,Jijuan Cao
Fumonisin B1 (FB1), as one of the highest toxicity mycotoxins, poses a serious threat to animal and human health, even at low concentrations. It is significant and challenging to develop a sensitive and reliable analytical device. Herein, a paper-based electrochemical aptasensor was designed utilizing tetrahedral DNA nanostructures (TDNs) to controllably anchor an aptamer (Apt), improving the recognition efficiency of Apt to its target. First, gold nanoparticles (AuNPs)@MXenes were used as a sensing substrate with good conductivity and modified on the electrode for immobilization of complementary DNA–TDNs (cDNA–TDNs). In the absence of FB1, numerous Apt–Au@Pt nanocrystals (NCs) was hybridized with cDNA and assembled on the sensing interface, which accelerated the oxidation of TMB with H2O2 and produced a highly amplified differential pulse voltammetry (DPV) signal. When the target FB1 specifically bound to its Apt, the electrochemical signal was decreased by releasing the Apt–Au@Pt NCs from double-stranded DNA (dsDNA). On account of the strand displacement reaction by FB1 triggering, the aptasensor had a wider dynamic linear range (from 50 fg/mL to 100 ng/mL) with a lower limit of detection (21 fg/mL) under the optimized conditions. More impressively, the designed FB1 aptasensor exhibited satisfactory performance in corn and wheat samples. Therefore, the TDN-engineered sensing platform opens an effective approach for sensitive and accurate analysis of FB1, holding strong potential in food safety and public health.
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PubMed
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APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Hongbo Yu,Shuibo Wang,Lin Zhu,Chunzheng Wu
Pt nanocatalysts exhibits superior activity towards the hydrogenation reaction of halonitrobenzenes (HNBs), but the selectivity to the valuable product haloanilines (HANs) is always poor due to the unavoidable dehalogenation process. In this study, we find that coating a thin Sn layer on Pt nanoparticles (NPs) could improve not only the hydrogenation activity but also the selectivity to HANs. These core–shell structured Pt@Sn NPs with different Sn shell thickness were synthesized by one-pot reduction, and their catalytic performance in the hydrogenation reaction of p -chloronitrobenzene to p -chloroaniline could be effectively regulated by the Pt/Sn ratio. The catalyst with a Pt/Sn ratio of 5/1 achieved the highest p -chloronitrobenzene conversion (96.5 %) and excellent selectivity to p -chloroaniline (97.9 %). The kinetic study and H 2 -TPD analysis indicated that the Sn species on Pt could facilitate the adsorption of p -chloronitrobenzene and the dissociation of H 2 . The designed Pt@Sn core–shell nanocatalysts are applicable to a wide range of hydrogenation reactions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Man Zhao,Yanying Jing,He Xiao,Rong Zhang,Xuemin Yang,Li Zhang,Haishun Wu,Jianfeng Jia
The fabrication of low-Pt loading and cost-efficient electrocatalysts still remains a challenge. In this work, a defective PtPd alloy with ultralow Pt content loaded on graphene (PtPd/G-40) is prepared by electrolytic synthesis method . During electrolysis, the formation of PtPd precursors and the exfoliation of graphite are achieved at the anode and cathode of the cell, respectively. The as-prepared PtPd/G-40 shows excellent electrocatalytic activity and stability toward hydrogen evolution reaction (HER) and ethanol oxidation reaction (EOR). Its mass activity is 29.7 times (at −100 mV) and 1.5 times higher than that of commercial Pt/C for HER and EOR, respectively. The ligand effect generated by formation of PtPd alloy and strain effect caused by abundant defects optimize the electronic structure of active Pt, which enhances its intrinsic activity and reduces the activation energy for HER and EOR. This facile synthetic approach generates a new type of graphene supporting defective metal alloy nanostructures as potential electrocatalysts for advanced energy conversion applications.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Weijia Li,Lingchu Huang,Tong Wang,Xidong Hao,Bin Wang,Qi Lu,Xishuang Liang,Fengmin Liu,Fangmeng Liu,Chenguang Wang,Geyu Lu
The development of high-performance gas sensors for detecting trace amount of CH 3 OH is an essential and a challenging task for safety using fuel cell vehicles (FCVs). In this work, the metal oxides (SnO 2 , In 2 O 3 , CuO) are employed as the catalyst carrier materials in fuel cell type sensors for the first time to replace traditional carbon, with which the Pt/MO x based fuel cell type sensors are fabricated. Among them, Pt/SnO 2 based sensor displays the lowest detection limit because SnO 2 carrier can not only support Pt particles but also provide an appropriate number of electrons for Pt, which is beneficial to reduce the adsorption strength of the intermediates and then improves the catalytic ability. The detection limit is as low as 0.5 ppm, the lowest of the various types of CH 3 OH sensors that work at room temperature. Moreover, the Pt/SnO 2 based fuel cell type sensor displays the characters of high selectivity, good repeatability and robust moisture resistance. To the best of our knowledge, this is the first report employing MO x as the catalyst carrier materials in fuel cell type sensors.
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APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Jie Zhang,Ruiying Wang,Xiaoqin Hu,Zhipeng Sun,Xingchao Wang,Yong Guo,Lili Yang,Mengran Lou,Pengtao Wen
The fabrication of a Pt-based catalyst with high activity and stability for methanol electrooxidation is both of vital importance and challenging for direct methanol fuel cells. Herein, a catalyst support based on Co embedded into N-doped nanotube decorated mesoporous carbon (Co@NCNTs-MC) derived from metal-organic frameworks (MOFs) was synthesized by a pyrolysis method at an appropriate temperature and duration using ZIF-67 as a precursor, and melamine as an additional nitrogen source. The presence of melamine ensures adequate nitrogen content at high temperature, promotes the formation of NCNTs through the help of Co nanoparticles in the pyrolysis process and forms a mesoporous carbon structure. The optimum pyrolysis condition was found to be 800 °C for 4 h. A Pt-based catalyst was synthesized with the as-prepared Co@NCNTs-MC support which was found to significantly improve the dispersion of Pt nanoparticles and enhance the transportation of electrons and mass. Co-N x bonds are shown to provide an abundance of active sites. A Pt/Co@NCNTs-MC800-4 sample is found to show mass activities of 700.3 mA mg −1 Pt for methanol electrooxidation, which is approximately 4.5 times higher than that of 20% Pt/C. This work brings new opportunities to design and prepare promising catalyst supports for direct methanol fuel cells.
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