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Jin P, Wan P, Zhang C, Li X, Wang Y, Luo J, Li K. Analyte-perturbed balance between reducibility and fluorescence of Ti 3C 2 MXene quantum dots for label-free, dual-mode detection of silver ions. Anal Chim Acta 2024; 1303:342517. [PMID: 38609276 DOI: 10.1016/j.aca.2024.342517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/05/2024] [Accepted: 03/21/2024] [Indexed: 04/14/2024]
Abstract
BACKGROUND As an emerging and attractive low-dimensional functional materials, Ti3C2 MXene quantum dots (QDs) enlarge the toolbox of fluorescence sensing. However, monochromatic fluorescence, which only provide one single signal, is often beset by challenges such as false-positive readouts and limitations in selectivity. Consequently, to improve the sensing accuracy by means of cross-verified dual-signal authentication, the endeavor to engineer dual-mode nanoprobes based on Ti3C2 QDs, incorporating both the capability of fluorescence and an alternative sensing mechanism, emerges as a compelling avenue. RESULTS Here, based on the alterations in colorimetric and fluorescent signals of Ti3C2 QDs with the addition of Ag+, we propose a dual-mode sensor obviating the necessity for nanoprobe labeling. Owing to the decent reducibility of Ti3C2 QDs, Ag+ is adsorbed and reduced, resulting in the generation of plasmonic Ag nanoparticles (NPs), which simultaneously trigger colorimetric responses of the solution and enhance the fluorescent emission of Ti3C2 QDs. The confluence of colorimetry and fluorometry within this strategy optimally harnesses the modulating role of the acquired Ag NPs on the reducing capability and fluorescence characteristics of Ti3C2 QDs. The equilibrium imparts versatility and promising prospects to this analyte-triggered label-free method, which enables a remarkable specificity and an excellent detecting limit (0.45 μM) for Ag+. SIGNIFICANCE The balance between reducibility and fluorescence of Ti3C2 QDs for dual-mode detection is inventively demonstrated. With the exemplification of a direct influence of both features of the nanoprobe via the introduction of analytes, this study opens the feasibility of the analyte-perturbed felicitous equilibrium, which endows label-free methods with versatility and promising prospects. This design may evoke more biosensing strategies with the function of double-signal mutual verification.
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Affiliation(s)
- Peng Jin
- Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang, 471023, China; State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Pingping Wan
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Chunyan Zhang
- School of Chemical and Environmental Engineering, Hunan Institute of Technology, Hengyang, 421002, China.
| | - Xu Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Yan Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Jianxin Luo
- School of Materials Science and Engineering, Hunan Institute of Technology, Hengyang, 421002, China
| | - Kun Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.
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Yang GQ, Niu Y, Kondratenko VA, Yi X, Liu C, Zhang B, Kondratenko EV, Liu ZW. Controlling Metal-Oxide Reducibility for Efficient C-H Bond Activation in Hydrocarbons. Angew Chem Int Ed Engl 2023; 62:e202310062. [PMID: 37702304 DOI: 10.1002/anie.202310062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 09/07/2023] [Accepted: 09/12/2023] [Indexed: 09/14/2023]
Abstract
Knowing the structure of catalytically active species/phases and providing methods for their purposeful generation are two prerequisites for the design of catalysts with desired performance. Herein, we introduce a simple method for precise preparation of supported/bulk catalysts. It utilizes the ability of metal oxides to dissolve and to simultaneously precipitate during their treatment in an aqueous ammonia solution. Applying this method for a conventional VOx -Al2 O3 catalyst, the concentration of coordinatively unsaturated Al sites was tuned simply by changing the pH value of the solution. These sites affect the strength of V-O-Al bonds of isolated VOx species and thus the reducibility of the latter. This method is also applicable for controlling the reducibility of bulk catalysts as demonstrated for a CeO2 -ZrO2 -Al2 O3 system. The application potential of the developed catalysts was confirmed in the oxidative dehydrogenation of ethylbenzene to styrene with CO2 and in the non-oxidative propane dehydrogenation to propene. Our approach is extendable to the preparation of any metal oxide catalysts dissolvable in an ammonia solution.
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Affiliation(s)
- Guo-Qing Yang
- Key Laboratory of Syngas Conversion of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
- Leibniz-Institut für Katalyse e.V, Albert-Einstein-Strasse 29 a, Rostock, 18059, Germany
| | - Yiming Niu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Vita A Kondratenko
- Leibniz-Institut für Katalyse e.V, Albert-Einstein-Strasse 29 a, Rostock, 18059, Germany
| | - Xianfeng Yi
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Chang Liu
- Key Laboratory of Syngas Conversion of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
| | - Bingsen Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Evgenii V Kondratenko
- Leibniz-Institut für Katalyse e.V, Albert-Einstein-Strasse 29 a, Rostock, 18059, Germany
| | - Zhong-Wen Liu
- Key Laboratory of Syngas Conversion of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China
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Xiong M, Gu S, Gu H, Zhang D, Ma C, Xu Z. New insights into iron/nickel-carbon ternary micro-electrolysis toward 4-nitrochlorobenzene removal: Enhancing reduction and unveiling removal mechanisms. J Colloid Interface Sci 2022; 612:308-22. [PMID: 34998191 DOI: 10.1016/j.jcis.2021.12.116] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 12/07/2021] [Accepted: 12/18/2021] [Indexed: 12/11/2022]
Abstract
The ternary micro-electrolysis material iron/nickel-carbon (Fe/Ni-AC) with enhanced reducibility was constructed by introducing the trace transition metal Ni based on the iron/carbon (Fe/AC) system and used for the removal of 4-nitrochlorobenzene (4-NCB) in solution. The composition and structures of the Fe/Ni-AC were analyzed by various characterizations to estimate its feasibility as reductants for pollutants. The removal efficiency of 4-NCB by Fe/Ni-AC was considerably greater than that of Fe/AC and iron/nickel (Fe/Ni) binary systems. This was mainly due to the enhanced reducibility of 4-NCB by the synergism between anode and double-cathode in the ternary micro-electrolysis system (MES). In the Fe/Ni-AC ternary MES, zero-iron (Fe0) served as anode involved in the formation of galvanic couples with activated carbon (AC) and zero-nickel (Ni0), respectively, where AC and Ni0 functioned as double-cathode, thereby promoting the electron transfer and the corrosion of Fe0. The cathodic and catalytic effects of Ni0 that existed simultaneously could not only facilitate the corrosion of Fe0 but also catalyze H2 to form active hydrogen (H*), which was responsible for 4-NCB transformation. Besides, AC acted as a supporter which could offer the reaction interface for in-situ reduction, and at the same time provide interconnection space for electrons and H2 to transfer from Fe0 to the surface of Ni0. The results suggest that a double-cathode of Ni0 and AC could drive much more electrons, Fe2+ and H*, thus serving as effective reductants for 4-NCB reduction.
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Seo Y, Lee MW, Kim HJ, Choung JW, Jung C, Kim CH, Lee KY. Effect of Ag doping on Pd/Ag-CeO 2 catalysts for CO and C 3H 6 oxidation. J Hazard Mater 2021; 415:125373. [PMID: 33765567 DOI: 10.1016/j.jhazmat.2021.125373] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 01/15/2021] [Accepted: 02/07/2021] [Indexed: 06/12/2023]
Abstract
To achieve high fuel efficiency and low emission in automobiles, it is necessary to develop highly active diesel oxidation catalysts (DOCs). Pd/CeO2 catalysts have been widely used as active catalysts for CO and C3H6 oxidation reactions. Additionally, Ag has been reported to enhance the oxygen storage capacity (OSC) of CeO2, which contributes to the oxidation ability of Pd/CeO2. In this study, Pd/Ag-CeO2 catalysts were used for CO and C3H6 oxidation reactions. When CeO2 was doped with appropriate amounts of Ag, reducibility and CO desorption rate were increased, which confirmed the high OSCs of Ag-doped catalysts. However, Ag particles were formed and the Ce3+/Ce4+ ratio decreased when CeO2 was doped with excess amounts of Ag. In addition, reduced Pd (Pd0), which is an active species for C3H6 oxidation, was formed and maintained even under oxidative reaction conditions. Since the removal of C3H6 is important for the oxidation of CO and C3H6, the catalyst with the highest Pd0 fraction (Pd/0.1Ag-CeO2 and Pd/0.3Ag-CeO2) presented improved catalytic activity. Consequently, the optimal amount of Ag enhanced the OSC of Pd/Ag-CeO2 catalysts and formed active Pd0 species under oxidative conditions, which resulted in the excellent catalytic activity of Pd/Ag-CeO2 for the CO and C3H6 oxidation reaction.
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Affiliation(s)
- Yaeun Seo
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul 02841, South Korea
| | - Min Woo Lee
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul 02841, South Korea
| | - Hyun Jae Kim
- Central Technology R&D Institute, Hyundai Oilbank Co., Ltd, 17-10 Mabok-ro 240beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do 16891, South Korea
| | - Jin Woo Choung
- Energy & Environmental Chemical Systems Lab, Hyundai Motor Group, 37, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-Do 16082, South Korea
| | - ChangHo Jung
- Energy & Environmental Chemical Systems Lab, Hyundai Motor Group, 37, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-Do 16082, South Korea
| | - Chang Hwan Kim
- Energy & Environmental Chemical Systems Lab, Hyundai Motor Group, 37, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-Do 16082, South Korea
| | - Kwan-Young Lee
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul 02841, South Korea; Super Ultra Low Energy and Emission Vehicle (SULEEV) Center, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul 02841, South Korea; Graduate School of Energy and Environment (KU-KIST Green School), Korea University, Seoul 02841, South Korea.
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Lee J, Lee MW, Kim MJ, Lee JH, Lee EJ, Jung C, Choung JW, Kim CH, Lee KY. Effects of La incorporation in catalytic activity of Ag/La-CeO 2 catalysts for soot oxidation. J Hazard Mater 2021; 414:125523. [PMID: 33676254 DOI: 10.1016/j.jhazmat.2021.125523] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 02/21/2021] [Accepted: 02/22/2021] [Indexed: 06/12/2023]
Abstract
Owing to strengthened regulations toward vehicle emissions, the use of diesel particulate filter technology to reduce particulate matter emissions has attracted significant attention. To achieve low temperature oxidation of particulate matter, numerous studies on Ag/CeO2 catalysts for soot oxidation have been reported. Herein, Ag/La-CeO2 catalysts with different La contents are synthesized and compared to analyze the effect of La. Hydrogen temperature programmed reduction analysis confirms that the reducibility increases with an increase in the La content in La-CeO2. X-ray photoelectron spectroscopy and Raman analysis confirm an increase of oxygen vacancies with La doping. Accordingly, the soot oxidation performances estimated by temperature programmed oxidation experiments increase with La doping. However, the catalytic activity of Ag/La-CeO2 exhibits a volcano trend. When an appropriate amount of La is incorporated in Ag/CeO2, peroxide generation and reducibility improve, thereby enhancing the soot oxidation performance. Conversely, the catalytic activities gradually decrease with excess La-doping. Scanning transmission electron microscopy analysis and density functional theory calculations confirm that excess amounts of La induce the sintering of Ag particles, which lead to the degradation of peroxide generation and reducibility of the catalysts. Consequently, an optimal amount of La incorporation on Ag/La-CeO2 results in the best soot oxidation performance.
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Affiliation(s)
- Jaesung Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Woo Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min June Kim
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jae Hwan Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Eun Jun Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - ChangHo Jung
- Energy & Environmental Chemical Systems Lab, 37, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16082, Republic of Korea
| | - Jin Woo Choung
- Energy & Environmental Chemical Systems Lab, 37, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16082, Republic of Korea
| | - Chang Hwan Kim
- Energy & Environmental Chemical Systems Lab, 37, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16082, Republic of Korea
| | - Kwan-Young Lee
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea; Super Ultra Low Energy and Emission Vehicle (SULEEV) Center, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea; KU-KIST Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
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Patel DM, Loewen JM, Braithwaite KA, Milla SS, Richer EJ. Radiographic findings predictive of ir reducibility and surgical resection in ileocolic intussusception. Pediatr Radiol 2020; 50:1249-1254. [PMID: 32519054 DOI: 10.1007/s00247-020-04695-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 03/14/2020] [Accepted: 04/23/2020] [Indexed: 11/24/2022]
Abstract
BACKGROUND Ileocolic intussusception is a common cause of intestinal obstruction in young children. Radiographs may be of limited value in the diagnosis of intussusception and are sometimes utilized primarily to exclude pneumoperitoneum before therapeutic enema reduction. OBJECTIVE The goal of this study was to determine if radiographic findings in ileocolic intussusception can offer prognostic information regarding the outcome of therapeutic air enema and, for those requiring surgical intervention, surgical outcomes and/or complications. MATERIALS AND METHODS A single institution retrospective study was performed including all enemas for intussusception performed during a 5-year period from September 2012 to August 2017. Radiographs obtained before therapeutic enema, including our institution radiographs, outside facility radiographs, or scout images obtained during fluoroscopy or computed tomography (CT), were independently scored by two pediatric radiologists for normal bowel gas pattern, soft-tissue mass, paucity of bowel gas, meniscus sign and bowel obstruction. The reviewers were blinded to enema and surgical outcomes at the time of review. Differences were resolved by consensus. Cases were excluded in which there was no adequate pre-procedure radiograph. In total, 182 cases were reviewed. The medical records were reviewed for enema and surgical outcomes. RESULTS Radiographic findings included normal bowel gas pattern in 13%, soft-tissue mass in 26%, paucity of bowel gas in 65%, meniscus sign in 12% and obstruction in 10% of the cases, with 17.5% of patients having more than one finding. In patients with bowel obstruction on radiographs, there was a statistically significant decrease in success of therapeutic enema (83% vs. 21%, P=0.0001), increase in complicated surgical reductions (47% vs. 4%, P=0.0012), and increase in bowel resection (42% vs. 4%, P=0.003) compared to patients with normal bowel gas pattern. CONCLUSION Radiographs can offer prognostic information regarding the potential for therapeutic enema success, as well as potential surgical outcomes in patients failing enema reduction. Particularly, bowel obstruction significantly decreases the success of therapeutic enema and increases the need for bowel resection.
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Affiliation(s)
- Dhruv M Patel
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA, USA
| | - Jonathan M Loewen
- Department of Radiology, Emory University/Children's Healthcare of Atlanta, 1405 Clifton Rd., Atlanta, GA, 30329, USA
| | - Kiery A Braithwaite
- Department of Radiology, Emory University/Children's Healthcare of Atlanta, 1405 Clifton Rd., Atlanta, GA, 30329, USA
| | - Sarah S Milla
- Department of Radiology, Emory University/Children's Healthcare of Atlanta, 1405 Clifton Rd., Atlanta, GA, 30329, USA
| | - Edward J Richer
- Department of Radiology, Emory University/Children's Healthcare of Atlanta, 1405 Clifton Rd., Atlanta, GA, 30329, USA.
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Afzal M, Ismaeel T, Jamal M. Reducible problem for a class of almost-periodic non-linear Hamiltonian systems. J Inequal Appl 2018; 2018:199. [PMID: 30839579 PMCID: PMC6096923 DOI: 10.1186/s13660-018-1787-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 07/18/2018] [Indexed: 06/09/2023]
Abstract
This paper studies the reducibility of almost-periodic Hamiltonian systems with small perturbation near the equilibrium which is described by the following Hamiltonian system: d x d t = J [ A + ε Q ( t , ε ) ] x + ε g ( t , ε ) + h ( x , t , ε ) . It is proved that, under some non-resonant conditions, non-degeneracy conditions, the suitable hypothesis of analyticity and for the sufficiently small ε, the system can be reduced to a constant coefficients system with an equilibrium by means of an almost-periodic symplectic transformation.
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Affiliation(s)
- Muhammad Afzal
- School of Mathematical Sciences, Ocean University of China, Qingdao, P.R. China
| | - Tariq Ismaeel
- Department of Mathematics, Government College University, Lahore, Pakistan
| | - Muhammad Jamal
- Department of Mathematics and Statistics, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi, Pakistan
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Yu Y, Wang J, Chen J, He X, Wang Y, Song K, Xie Z. Regeneration of commercial selective catalyst reduction catalysts deactivated by Pb and other inorganic elements. J Environ Sci (China) 2016; 47:100-108. [PMID: 27593277 DOI: 10.1016/j.jes.2015.12.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 12/22/2015] [Accepted: 12/22/2015] [Indexed: 06/06/2023]
Abstract
The regeneration of commercial SCR (Selective Catalyst Reduction) catalysts deactivated by Pb and other elements was studied. The deactivated catalyst samples were prepared by chemical impregnation with mixed solution containing K2SO4, Na2SO4, CaSO4, Pb(NO3)2 and NH4H2PO4. A novel method combining Ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) and H2SO4 solution (viz. catalysts treated by dilute EDTA-2Na and H2SO4 solution in sequence) was used to recover the activity of deactivated samples, and the effect was compared with single H2SO4, oxalic acid, acetic acid, EDTA or HNO3 solutions. The surface structure, acidity and reducibility of samples were characterized by N2 adsorption-desorption, inductively coupled plasma optical emission spectrometer (ICP-OES), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF), H2-temperature programmed section (H2-TPR), NH3-temperature programmed desorption (NH3-TPD) and in situ DRIFTS. Impurities caused a decrease of specific surface area and surface reducibility, as well as Brønsted acid sites, and therefore led to severe deactivation of the SCR catalyst. The use of an acid solution alone possibly eliminated the impurities on the deactivated catalyst to some extent, and also increased the specific surface area and Brønsted acid sites and promoted the surface reducibility, thus recovered the activity partially. The combination of EDTA-2Na and H2SO4 could remove most of the impurities and improve the activity significantly. The removal of Pb should be an important factor for regeneration. Due to a high removal rate for Pb and other impurities, the combination of EDTA-2Na and H2SO4 solutions provided the best efficiency.
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Affiliation(s)
- Yanke Yu
- Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jinxiu Wang
- Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jinsheng Chen
- Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Xinjiang He
- Huadian Zouxian Power Co. Ltd, Shandong 273522, China
| | - Yujing Wang
- Huadian Zouxian Power Co. Ltd, Shandong 273522, China
| | - Kai Song
- Huadian Zouxian Power Co. Ltd, Shandong 273522, China
| | - Zongli Xie
- CSIRO Materials Science & Engineering, Private Bag 33, Clayton, VIC, 3168, Australia.
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Moon YW, Kim JG, Han JH, Do KH, Seo JG, Lim HC. Factors correlated with the reducibility of varus deformity in knee osteoarthritis: an analysis using navigation guided TKA. Clin Orthop Surg 2013; 5:36-43. [PMID: 23467320 PMCID: PMC3582869 DOI: 10.4055/cios.2013.5.1.36] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 08/02/2012] [Indexed: 11/30/2022] Open
Abstract
Background We hypothesized that a number of clinical and radiologic parameters could influence the reducibility of varus deformity in total knee arthroplasty. The aim of this study was to identify the factors correlated with reducibility of varus deformity and predict more accurately the amount of medial soft tissue release required in varus deformity total knee arthroplasty. Methods One hundred forty-three knees with preoperative varus alignment and medial osteoarthritis were included in this retrospective study. The total knee arthroplasties were performed using a navigation system (OrthoPilot) by single surgeon. To assess varus deformity, the authors measured preoperative mechanical axis angles and valgus stress angles. Mechanical tibial angles, mechanical femoral angles, femoral osteophyte sizes, and tibial osteophyte sizes were measured. The Ahlbäck grading scale was applied for radiologic parameters, and clinical parameters (age, body mass index, sex, duration of pain, and preoperative range of motion) were documented. Correlations between these factors and preoperative valgus stress angle were analyzed. Results A negative correlation was found between preoperative mechanical axis angle and preoperative valgus stress angle (p < 0.01, r = -0.38), and a positive correlation was found between the preoperative mechanical tibial angle and preoperative valgus stress angle (p = 0.01, r = 0.19). Conclusions The present study shows that preoperative varus deformity and proximal tibial vara (measured by preoperative mechanical axis angle and mechanical tibial angle, respectively) are correlated with reducibility of varus deformity (measured by preoperative valgus stress angle), and clinical parameters (age, range of motion, duration of pain and body mass index) and other radiologic parameters (osteophyte size, severity of osteoarthritis and angulation of distal femoral joint surface) were not significantly correlated with reducibility of varus deformity.
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Affiliation(s)
- Young Wan Moon
- Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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