JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Xiaotong Li,Kaimei Fan,Ruimei Yang,Xiuxiu Du,Baohan Qu,Xiangmin Miao,Lihua Lu
Different from fluorescent dyes-doped or carbon materials-based ratiometric tetracycline nanoprobes, herein, a new Ir(III) complex-doped and europium(III) ion (Eu 3+ )-functionalized silicon nanoparticles (Ir(III)@SiNPs-Eu 3+ ) with long luminescent lifetimes was firstly fabricated for selective detection of tetracycline (TC) in complex systems through time-resolved emission spectra (TRES) measurement. In the presence of TC, the red phosphorescence of Eu 3+ is greatly enhanced by adsorption energy transfer emission (AETE) of TC, while the strong green luminescence of Ir(III)@SiNPs is quenched by the inner filtration effect (IFE) of TC. Based on these striking emission changes, Ir(III)@SiNPs-Eu 3+ can sensitively detect TC in the linear range of 0.01–20 μM with a detection limit of 4.9 × 10 –3 μM. Benefitting from the long lifetime of Ir(III)@SiNPs-Eu 3+ , the nanoprobe demonstrates excellent TC detection performance through TRES in high background system of 5 % human serum. Furthermore, the formed Ir(III)@SiNPs-Eu 3+ /TC complex can be used to sensitively recognize Hg 2+ via a ratiometric luminescence mode. Notably, the cytotoxicity of Ir(III)@SiNPs-Eu 3+ is very low and thus the sensitive monitoring the detection of Ir(III)@SiNPs-Eu 3+ to TC and Hg 2+ also works well in porcine renal cells, demonstrating high application potential in real samples.
研究领域:
分析化学
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生物医学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Rongrong Hong,Yunshuo Wu,Yuetan Su,Chu Qin,Haiqiang Wang,Xuanhao Wu,Zhongbiao Wu,Xiaole Weng
Highly efficient catalysts for methane combustion have long been pursued due to the intrinsic inertness of CH 4 . In this work, bimetallic PtIr/TiO 2 catalysts with varying Pt:Ir ratios were synthesized to modulate the electronic structures of the metals, thereby achieving bimetallic synergy to enhance CH 4 combustion activity. Among the series of monometallic and bimetallic catalysts, Pt 0.5 Ir 0.5 /TiO 2 exhibited the highest activity, achieving complete CH 4 conversion (T 100 ) at 370°C after activation during the first reaction cycle. Combined experimental and computational studies elucidated that the incorporation of Ir facilitated electron transfer and the formation of partially oxidized Pt δ+ (0 < δ < 2) species, which were coordinatively unsaturated and more conducive for CH 4 oxidation. The high affinity of Ir for oxygen enabled the Pt δ+ species to be stabilized under CH 4 oxidation reaction conditions, instead of being overoxidized into Pt 2+ species as in the monometallic Pt 1 /TiO 2 catalyst. Simultaneously, Ir species in the bimetallic catalyst were oxidized into Ir δ+ species during the reaction and ultimately formed the Pt δ+ -O-Ir δ+ interface to further elevate the reaction activity. Moreover, the bimetallic catalysts integrated the merits of Ir for CH 4 adsorption and Pt for intermediates conversion, synergistically boosting the reaction activity. This work provides insight into designing effective CH 4 combustion catalysts through fine-tuning the metal electronic structures.
研究领域:
催化化学
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材料科学
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环境化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Rongying Zhu,Renqin Yu,Kun Yin,Shiming Zhang,Joey Chung-Yen Jung,Yufeng Zhao,Menggang Li,Zhonghong Xia,Jiujun Zhang
Developing highly active methanol oxidation electrocatalysts with superior anti-CO poisoning capability remains a grand challenge. Herein, a simple strategy was employed to prepare distinctive PtFeIr jagged nanowires with Ir located at the shell and Pt/Fe located at the core. The Pt 64 Fe 20 Ir 16 jagged nanowire possesses an optimal mass activity of 2.13 A mg Pt -1 and specific activity of 4.25 mA cm −2 , giving the catalyst a great edge over PtFe jagged nanowire (1.63 A mg Pt -1 and 3.75 mA cm −2 ) and Pt/C (0.38 A mg Pt -1 and 0.76 mA cm −2 ). The in-situ Fourier transform infrared (FTIR) spectroscopy and differential electrochemical mass spectrometry (DEMS) unravel the origin of extraordinary CO tolerance in terms of key reaction intermediates in the non-CO pathway. Density functional theory (DFT) calculations add to the body of evidence that the surface Ir incorporation transforms the selectivity from CO pathway to non-CO pathway. Meanwhile, the presence of Ir serves to optimize surface electronic structure with weakened CO binding strength. We believe this work will advance the understanding of methanol oxidation catalytic mechanism and provide some insight into structural design of efficient electrocatalysts.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2022
·
IF 4.132
Ting Yan,Gulinigaer Alimu,Lijun Zhu,Huimin Fan,Linxue Zhang,Zhong Du,Rong Ma,Shuang Chen,Nuernisha Alifu,Xueliang Zhang
High treatment accuracy is the key to efficient cancer treatment. Photodynamic therapy (PDT) and photothermal therapy (PTT) are two kinds of popular, precise treatment methods. The combination of photodynamic and photothermal therapy (PDT/PTT) can greatly enhance the precise therapeutic efficacy. In this work, protoporphyrin IX (PpIX) was selected as the PDT agent (photosensitizer), and new indocyanine green (IR-820) was selected as the PTT agent. Further, the two kinds of theranostic agents were encapsulated by biological-membrane-compatible liposomes to form PpIX-IR-820@Lipo nanoparticles (NPs), a new kind of PDT/PTT agent. The PpIX-IR-820@Lipo NPs exhibited good water solubility, a spherical shape, and high fluorescence peak emission in the near-infrared spectral region (700–900 nm, NIR). The cellular toxicity of PpIX-IR-820@Lipo NPs for human cervical cancer cells (HeLa) and human cervical epithelial cells (H8) was detected by the CCK-8 method, and low cytotoxicity was observed for the PpIX-IR-820@Lipo NPs. Then, the excellent cellular uptake of PpIX-IR-820@Lipo NPs was confirmed by laser scanning confocal microscopy. Moreover, the PDT/PTT property of PpIX-IR-820@Lipo NPs was illustrated via 2′,7′-dichlorofluorescin diacetate (DCFH-DA) and annexin V-fluorescein isothiocyanate (annexin V-FITC), as indicator probes. The PDT/PTT synergistic efficiency of PpIX-IR-820@Lipo NPs on HeLa cells was verified, exhibiting a high efficiency of 70.5%. Thus, the novel theranostic PpIX-IR-820@Lipo NPs can be used as a promising PDT/PTT synergistic theranostic nanoplatform in future cervical cancer treatment.
研究领域:
癌症研究
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纳米技术
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光疗
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生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Chunlei Wang,Qi Yao,Lina Cao,Junjie Li,Si Chen,Junling Lu
Preferential oxidation of CO in H2 (PROX) has been regarded as the most promising on-board approach to remove the trace levels of CO (∼1%) present in hydrogen fuels and thus to protect the Pt electrodes of proton exchange membrane fuel cells (PEMFCs) against CO poisoning. However, development of an active and selective catalyst toward CO oxidation in a broad low-temperature range remains challenging due to the competitive hydrogen oxidation reaction. Here, we report that selective deposition of the FeOx overcoat onto SiO2-supported Ir nanoparticles using the atomic layer deposition (ALD) technique allows precisely tailoring Ir–FeOx interfaces for optimizing catalytic performance in the PROX reaction. Compared to the uncoated Ir/SiO2 sample, FeOx-coated Ir/SiO2 samples exhibited remarkable activity enhancements, where we observed a volcano trend of the improved activity as a function of the numbers of FeOx ALD cycles. The optimized catalytic performance was achieved on a 1.5 nm Ir/SiO2 sample with two cycles of FeOx overcoating, by achieving complete CO conversion in a broad temperature range of 60–180 °C in the PROX reaction, which is the broadest temperature range over Ir-based catalysts reported in the literature so far. We noticed that the activity improvement over these samples was much less pronounced in CO oxidation in the absence of H2, which implies that the formation of hydroxyls on the FeOx overcoat might be attributed to the large activity enhancement in the PROX reaction.
研究领域:
催化化学
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材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yixi Wang,Wenqing Xu,Chaoqun Li,Yang Yang,Zanbu Geng,Tingyu Zhu
Gaseous ammonia (NH 3 ), especially that emitted from selective catalytic reduction with NH 3 (NH 3 –SCR) units in the atmosphere is potentially harmful to both human health and the environment. The noble metal catalytic oxidation technology placed behind the SCR unit has been considered to be a promising method for decreasing NH 3 slip. In this study, we prepared Ir/Al 2 O 3 catalysts using two different crystal structures of Al 2 O 3 (α–Al 2 O 3 or γ–Al 2 O 3 ) as supported by an impregnation method and evaluated the performance of the selective catalytic oxidation of NH 3 (NH 3 –SCO). We found that the Ir/γ–Al 2 O 3 catalyst performed better than the Ir/α–Al 2 O 3 catalysts, with 99% of NH 3 converted at 260 °C. The X–ray absorption fine structure revealed that the active species on the Ir/Al 2 O 3 catalysts are mainly oxidized IrO 2 . High–angle annular dark–field images of aberration–corrected scanning transmission electron microscopy revealed that IrO 2 species over 1 nm in diameter are beneficial for activity. In situ diffuse reflectance for infrared Fourier transform spectroscopy studies suggested that the differences in NH 3 –SCO activity were caused by the activity of reactive oxygen species, and the formation of –NH 2 may be the decisive step of the NH 3 oxidation reaction.
研究领域:
催化
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 9
·4457-4468
·
IF 6.7
Chao Cai,Feng Tian,Junping Ma,Zipei Yu,Mo Yang,Changqing Yi
Precision medicine urges the development of theranostics which can efficiently integrate precise diagnosis and effective therapy. In this study, a facile synthesis of Ir/Gd bimetallic oxide nanotheranostics (termed BSA@Gd2O3/IrO2 NPs) with good biocompatibility was demonstrated using a biomineralization method where bovine serum albumin (BSA) served as a versatile template. BSA@Gd2O3/IrO2 NPs exhibited high longitudinal relaxivity (5.2 mM−1 s−1) and X-ray absorption capability (14.5 Hu mM−1), illustrating them to be a good contrast agent for magnetic resonance (MR) and computed tomography (CT) dual-modal imaging. Moreover, BSA@Gd2O3/IrO2 NPs can act as not only a photothermal conversion agent with ultrahigh efficiency (66.7%) as well as a good photosensitizer, but also an effective catalase to decompose endogenous H2O2 to produce O2, thus relieving hypoxia and enhancing the phototherapeutic effect. Both in vitro and in vivo experiments demonstrated the high effectiveness of BSA@Gd2O3/IrO2 NPs in MR/CT dual-modal imaging and photothermal and photodynamic synergistic tumor treatments. This work sheds new light on the development of versatile nanotheranostic systems using mild and robust biomineralization methods.
研究领域:
生物医学工程
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纳米医学
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肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Yaran Yin,Taotao Fu,Chunying Zhu,Youguang Ma
Densities and viscosities of binary mixtures {[Bmim][BF 4 ] + MDEA}, {MDEA + H 2 O} and ternary mixture {[Bmim][BF 4 ] + MDEA + H 2 O} were measured at T = (293.15–333.15) K. The volumetric and viscometric properties of binary and ternary mixtures, such as excess molar volume ( V E ), viscosity deviation (Δ η ), excess Gibbs energy of activation of viscous flow (Δ G ⁎E ), and Grunberg-Nissan interaction parameter ( G 12 ), were deduced from experimental data. The excess molar volumes and viscosities data were used to calculate the Redlich-Kister and Jouyban-Acree equations coefficients for binary mixtures , and Singh et al. and Jouyban-Acree extended equations coefficients for ternary mixtures. The intermolecular interactions in binary and ternary mixtures were discussed through volumetric and viscometric properties and FT-IR spectroscopic analysis .
研究领域:
物理化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2023
·Vol. 9
·期 42
·
IF 13.6
Xiaobo Zheng,Jiarui Yang,Peng Li,Qishun Wang,Jiabin Wu,Erhuan Zhang,Shenghua Chen,Zechao Zhuang,Weihong Lai,Shixue Dou,Wenping Sun,Dingsheng Wang,Yadong Li
The anode corrosion induced by the harsh acidic and oxidative environment greatly restricts the lifespan of catalysts. Here, we propose an antioxidation strategy to mitigate Ir dissolution by triggering strong electronic interaction via elaborately constructing a heterostructured Ir-Sn pair-site catalyst. The formation of Ir-Sn dual-site at the heterointerface and the resulting strong electronic interactions considerably reduce d-band holes of Ir species during both the synthesis and the oxygen evolution reaction processes and suppress their overoxidation, enabling the catalyst with substantially boosted corrosion resistance. Consequently, the optimized catalyst exhibits a high mass activity of 4.4 A mgIr−1 at an overpotential of 320 mV and outstanding long-term stability. A proton-exchange-membrane water electrolyzer using this catalyst delivers a current density of 2 A cm−2 at 1.711 V and low degradation in an accelerated aging test. Theoretical calculations unravel that the oxygen radicals induced by the π* interaction between Ir 5d-O 2p might be responsible for the boosted activity and durability.
研究领域:
电化学
·
催化
·
材料科学
·
能源存储与转换
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Kai Deng,Zilong Lian,Wenxin Wang,Jiabao Yu,Qiqi Mao,Hongjie Yu,Ziqiang Wang,Liang Wang,Hongjing Wang
Despite the fruitful achievements in the development of high-performance catalysts, most of materials still suffer limited HER kinetics and poor durability in harsh acidic media, especially at high current densities . In this work, a Pd nanoparticles/Ir metallene heterojunction structure (Pd/Ir hetero-metallene) were successfully prepared by a facile co-reduction method. The hydrogen spillover bridging H + adsorption/H 2 desorption process occurring at the Pd/Ir interface results in the rate-determining step change to a Tafel step, which accelerates the HER kinetics. The Pd/Ir hetero-metallene has a relatively low Δ G Hads (-0.19 eV), which allows for rapid adsorption of H + and release of H 2 , thus greatly improving the performance of HER. As a result, the Pd/Ir hetero-metallene exhibits remarkable HER performance with ultra-low overpotentials of only 69 and 133 mV to reach 500 and 1000 mA cm −2 , a small Tafel slope of 21 mV dec −1 , and superb stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 13
·19221-19232
·
IF 4.672
Vi Thuy Thi Phan,Toan Minh Pham,Hau Quoc Pham,Tai Thien Huynh,Thi Hong Tham Nguyen,Van Thi Thanh Ho
Summary Highly stable and cost-effective electrocatalysts are of importance in regulating energy conversion efficiency and commercial feasibility of direct methanol fuel cells (DMFCs). So far, integrating transition metals into Pt-based catalysts to enhance their catalytic performances for methanol electro-oxidation reaction (MOR) at the anode of DMFCs has received significant interest. This study witnessed the first time of depositing Pt 3 Co 1 alloy nanoparticles (NPs) on robust Ti 0.9 Ir 0.1 O 2 supports utilizing a modified reduction method that used NaBH 4 as a reducing agent in the absence of surfactants or stabilizers. This novel combination not only reduces the usage of costly and easily-deactivated Pt but also significantly improves catalytic activity and poisoning tolerance for MOR. Regarding electrocatalytic performance, the onset potential and the mass activity of the Pt 3 Co 1 /Ti 0.9 Ir 0.1 O 2 catalyst are ~0.1 V vs NHE and 316.16 mA/mg Pt , respectively, which are 4.5-fold lower and 1.5-fold higher than the corresponding figures for the commercial Pt/C (E-TEK) catalyst, ~0.45 vs NHE and 206.83 mA/mg Pt , indicating superior catalytic activity and CO-tolerance of the former over the latter. Furthermore, the superior anti-poisoning ability and stability of the Pt 3 Co 1 /Ti 0.9 Ir 0.1 O 2 catalyst are demonstrated by its 2.2-fold higher I f /I b ratio in MOR and lower degradation rate in the 60-min chronoamperometry (CA) and 3000-cycle scanning tests than the Pt/C counterpart. These enhancements could be abscribed to synergistic influence between the Pt-Co alloy NPs and the robust Ti 0.9 Ir 0.1 O 2 support. The addition of Co into the catalyst to promote removal of Pt-poisoning species as well as the use of highly corrosion-resistant Ir-doped TiO 2 as a catalyst support play a decisive role in boosting electrochemical behaviors of the Pt 3 Co 1 / Ti 0.9 Ir 0.1 O 2 catalyst. Generally, the success of this work in synthesizing high-performance Pt 3 Co 1 /Ti 0.9 Ir 0.1 O 2 catalyst could serve as groundwork for further development of TiO 2 -based material supported bimetallic catalysts for applications in the electrochemical catalysis field.
研究领域:
材料科学
·
电化学催化
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Zhen-xing Yang,Wen-yu Xie,Fang-fang Ye,De-hao Li
Electro-catalytic technology is a promising approach for wastewater treatment, owing to its easy operation, minimal generation of secondary pollution, small foot-print and rapid start-up. In this work, the chlorine evolution potential of the Pd-Sn modified ruthenium(Ru)-iridium(Ir) electrode was investigated for the electro-catalytic treatment of high chlorine ammonia-nitrogen wastewater. The effect of reaction conditions on the removal of ammonia-nitrogen, kinetics and apparent activation energy of ammonia-nitrogen removal were studied. The possible denitrification process of high chlorine ammonia-nitrogen wastewater was discussed. The results indicated that the chlorine evolution potential of the Pd-Sn modified Ru-Ir electrode was 1.0956 V(vs. SCE). The electro-catalytic treatment of high chlorine ammonia-nitrogen conformed to zero-order kinetic law, and the apparent activation energy of removal process was 14.089 kJ/mol. With a current was 0.5 A, the removal efficiency of ammonia-nitrogen could achieve 100% at a reaction time of 40 min. Indirect oxidation played an essential role in the electro-catalytic ammonia-nitrogen removal using the Pd-Sn modified Ru-Ir electrode. This paper demonstrated that the electro-catalytic technology was a promising approach for efficiently treating the high chlorine ammonia-nitrogen wastewater.
研究领域:
环境工程
·
废水处理
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）