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Bicarbonate levels in hemodialysis patients switching from lanthanum carbonate to sucroferric oxyhydroxide

World Journal of Nephrology 2018年第6期7卷 123-128页

作者： Aristeidis Stavroulopoulos Vasiliki Aresti Christoforos Papadopoulos Panagiotis Nennes Polixeni Metaxaki Anastasios Galinas Department of Nephrology IASIO HospitalGeneral Clinic of Kallithea

AIM To examine possible alterations in acid-base parameters in patients switching from lanthanum carbonate(LanC) to sucroferric oxyhydroxide(SFOH). METHODS Fifteen stable hemodialysis patients were switched from LanC to SFOH. Only nine continued on SFOH, three returned to LanC and the other three switched to sevelamer carbonate. The later six patients served as a control group to the SFOH group of nine patients. Blood was sampled on the 3-d and the last 2-d interval of the week prior to switching and six weeks after. Bicarbonate levels(HCO_3^-), pH, pO_2, pCO_2 were measured, and the mean of the two measurements(3-d and 2-d interval) was calculated. RESULTS Comparing pre-switching to post-switching measurementsin the SFOH group, no statistically significant differences were found in any of the parameters studied. The mean pre-switching HCO_3^-was 22.41 ± 1.66 mmol/L and the mean post-switching was 22.62 ± 2.25 mmol/L(P = 0.889). Respectively, the mean pH= 7.38 ± 0.03 vs 7.39 ± 0.03(P = 0.635), mean pCO_2= 38.41 ± 3.29 vs 38.37 ± 3.62 mmHg(P = 0.767), and Phosphate = 1.57 ± 0.27 vs 1.36 ± 0.38 mmol/L(P = 0.214). There were not any significant differences when we performed the same analyses in the control group or between the SFOH group and control group. No correlations were found, either between pre-switching LanC daily dose or between postswitching daily dose of the new binder and the measured *** In our small study, switching from LanC to SFOH did not have any significant effect on blood bicarbonate levels and gas analysis, indicating that there is no need to change hemodialysis prescription regarding these parameters.

关键词： Gas analysis Hemodialysis Lanthanum carbonate Acidosis Bicarbonate Phosphate binder Sucroferric oxyhydroxide

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Multicomponent transition metal oxides and(oxy)hydroxides for oxygen evolution

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Nano Research 2023年第2期16卷 1913-1966页

作者： Jingyi Han Jingqi Guan Institute of Physical Chemistry College of ChemistryJilin UniversityChangchun 130021China

Oxygen evolution reaction(OER)is the core electrode reaction in energy-related technologies,such as electrolytic water,electrocatalytic carbon dioxide reduction,rechargeable metal-air batteries,and renewable fuel *** of well-stocked,cost-effective,and high-performance OER electrocatalysts is the key to the improvement of energy efficiency and the large-scale commercial implementation of these *** transition metal oxides and(oxy)hydroxides are the most promising OER catalysts due to their low cost,adjustable structure,high electrocatalytic activity,and outstanding *** this review,a brief overview about the mechanisms of OER is first offered,accompanied with the theory and calculation ***,the latest advances in the rational design of the related OER electrocatalysts and the modulation of the electronic structure of active sites are comprehensively ***,various strategies(including element doping,defect engineering,and fabrication of binderless catalysts)used to improve the OER performance are detailedly discussed,emphasizing the structure–function ***,the challenges and perspectives on this promising field are proposed.

关键词： oxyhydroxide mixed oxide oxygen evolution reaction single-atom catalyst water splitting

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Ambient Fast Synthesis of Superaerophobic/Superhydrophilic Electrode for Superior Electrocatalytic Water Oxidation

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Energy & Environmental Materials 2023年第6期6卷 356-363页

作者： Jingjun Shen Jing Li Bo Li Yun Zheng Xiaozhi Bao Junpo Guo Yan Guo Chenglong Lai Wen Lei Shuangyin Wang Huaiyu Shao Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacaoSAR 999078China Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Key Laboratory of High Performance Polymer-based Composites of Guangdong ProvinceSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Chem/Bio-Sensing and Chemometrics Provincial Hunan Key Laboratory for Graphene Materials and DevicesCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Developing cost-effective and facile methods to synthesize efficient and stable electrocatalysts for large-scale water splitting is highly desirable but remains a significant *** this study,a facile ambient temperature synthesis of hierarchical nickel-iron(oxy)hydroxides nanosheets on iron foam(FF-FN)with both superhydrophilicity and superaerophobicity is ***,the as-fabricated FF-FN electrode demonstrates extraordinary oxygen evolution reaction(OER)activity with an ultralow overpotential of 195 mV at 10 mA cm^(-2)and a small Tafel slope of 34 mV dec^(-1)in alkaline *** theoretical investigation indicates that the involved lattice oxygen in nickel-iron-based-oxyhydroxide during electrochemical self-reconstruction can significantly reduce the OER reaction overpotential via the dominated lattice oxygen *** rechargeable Zn-air battery assembled by directly using the as-prepared FF-FN as cathode displays remarkable cycling *** is believed that this work affords an economical approach to steer commercial Fe foam into robust electrocatalysts for sustainable energy conversion and storage systems.

关键词： electrocatalysis oxygen evolution reaction oxyhydroxide superaerophobicity superhydrophilicity

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Magnetic field-assisted microbial corrosion construction iron sulfides incorporated nickel-iron hydroxide towards efficient oxygen evolution

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Chinese Journal of Structural Chemistry 2024年第1期43卷 40-46页

作者： Xianzheng Zhang Yana Chen Zhiyong Ye Huilin Hu Ling Lei Feng You Junlong Yao Huan Yang Xueliang Jiang Hubei Key Laboratory of Plasma Chemistry and Advanced Materials School of Materials Science and EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationWuhan Institute of TechnologyNo.206 Guanggu 1st RoadWuhan430205China

Nickel iron(hydroxyl)hydroxide with unique layered structure and controllable composition is widely regarded as typical oxygen evolution reaction(OER)***,developing top-down approaches to realize the facile preparation of transition metal hydroxide catalyst has received wide *** on the natural microorganism corrosion behavior,this work demonstrates the external magnetic field-assisted microbial corrosion strategy to construct advanced transition metal hydroxide OER catalyst,and the prepared biofilm electrode presents superior OER performance in the existence of magnetic field,which needs an overpotential of 287 mV at 100 mA cm^(-2).Experimental and theoretical calculations show the applied magnetic field can accelerate sulfate reducing bacteria(SRB)corrosion and chemical *** additional magnetic field can promote SRB corrosion to produce FeS,which can facilitate the optimization of O intermediate desorption from the NiOOH catalyst during OER process,reducing the reaction energy barrier for O→*** synergistic effect between the nickel-iron oxyhydroxides originated from the accelerated chemical corrosion and FeS produced from the accelerated SRB corrosion interprets the improved OER *** work explores the influence of magnetic field on the construction of advanced OER materials,which can provide an effective magnetic field-assisted corrosion engineering strategy,and promote the development of multidisciplinary fields of physics,biology,and emerging energy conversion technologies.

关键词： Oxygen evolution Electrocatalyst Microorganism corrosion Magnetic field oxyhydroxide

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Synthesis and Fluorescence Quantum Yield of Gd<sub>1-x</sub>Eu<sub>x</sub>OOH Crystals

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Journal of Materials Science and Chemical Engineering 2014年第3期2卷 23-29页

作者： Hiroaki Samata Daisuke Itakura Shungo Imanaka Tadashi C. Ozawa Graduate School of Maritime Sciences Kobe University Kobe Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science Tsukuba Japan

Eu3+-doped gadolinium oxyhydroxide Gd1-xEuxOOH crystals were synthesized by the flux method. The X-ray diffraction data for the crystals were well refined assuming a monoclinic structure with the P21/m space group. Gd1-xEuxOOH (x ≤ 0.2) crystals showed strong red emission, and the highest fluorescence quantum yield (Φf) was 0.27, obtained for x = 0.10. Φf decreased rapidly as the Eu3+ content x increased above 0.2, owing to concentration quenching. Analysis with a percolation model indicated three-dimensional energy transfer between the Eu3+ ions.

关键词： Gadolinium oxyhydroxide Fluorescence Quantum Yield Percolation Model

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Improvement of Fe(Ii)-Adsorption Capacity of Feooh-Coated Brick in Solutions, and Kinetics Aspects

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Journal of Water Resource and Protection 2012年第7期4卷 464-473页

作者： Saint Charles Dehou Joseph Mabingui Ludovic Lesven Michel Wartel Abdel Boughriet Chaire Unesco Sur la gestion de l’eau Laboratoire Hydrosciences Lavoisier Université de Bangui Faculté des Sciences B.P. 908 République Centrafricaine Université de Lille1 Laboratoire Géosystèmes Equipe Chimie Analytique et Marine CNRS UMR 8217 BatC8 59655 Villeneuve d’Ascq cedex France Université Lille Nord de France I.U.T de Béthune Département de Chimie Rue de l’Université B.P.819 62408 Béthune Cedex France

The adsorbent, iron oxy-hydroxide coated brick, was used in the present work for removal of iron(II) from aqueous solutions. The adsorption performances of this composite were significantly improved when brick pellets (as a support material) were pre-treated in a 6 M HCl solution at 90°C for 6 hours, when compared to untreated ones and those pre-washed in a 1M HCl solution at RT for 1 day. This phenomenon was attributed to larger surface areas measured for modified brick by BET, thus enabling a better FeOOH deposition. The ability of this new composite to better adsorb Fe2+ ions from synthetic solutions was evidenced from fixed-bed column experiments: data were compared to those obtained from raw brick and iron oxides - coated sand columns. The adsorption mechanism followed better pseudosecond-order reaction kinetics, suggesting a chemisorption process, and the rate constant increased with a temperature increase, revealing the endothermic nature of Fe(II) adsorption. Furthermore, the equilibrium data fitted the Langmuir isotherm model with a maximum monolayer sorption capacity Qmax = 0.669 mg/g and a Langmuir constant KL = 0.659 L/mg at room temperature. The activation energy (Ea) of Fe(II) adsorption and the changes in entropy (ΔS), enthalpy (ΔH) and free energy (ΔG) of activation were determined, with values suggesting the involvement of an activated chemical adsorption and an associative mechanism.

关键词： Brick Ferrous Ion Iron oxyhydroxide Acid Activation Adsorption Kinetics Activation Energy Water Treatment

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Uranium（V） Compounds Derived from High-Temperature/High-Pressure Hydrothermal Reactions

Uranium（V） Compounds Derived from High-Temperature/High-Pr...

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第十三届固态化学与无机合成学术会议

作者：李光华 (台湾)中央大学

Most uranium minerals can be classified as oxidized species in which U is fully oxidized to U6+, and reduced species, in which U occurs primarily as U4+. Uranyl silicates are an important group of U（VI） minerals in the altered zones of many uranium deposits.[1] One naturally occurring U（IV） silicate exists, namely coffinite（USiO 4）,[2] which is the most important ore mineral for uranium after uraninite（UO2+x）. Numerous synthetic U（VI） silicates and germanates containing organic amines or alkali metals as countercations have also been reported.[3] In contrast to the U（VI） compounds, the chemistry of materials containing U（V） is considerably less developed owing to the tendency of U5+ to either oxidize to U6+ or disproportionate to U4+ and U6+. We have synthesized a U（V） silicate and a germanate by a high-temperature, high-pressure hydrothermal method in gold ampoules contained in a high-pressure reaction vessel at ca. 600 oC and 170 MPa.[4a],[4b] Following the synthesis of the U（V） compounds, a number of mixed-valence uranium silicates and germanates have been synthesized, for example, a mixed-valence U（IV,V） silicate, Cs[2K（UO）2Si4O12,4c] U（IV,VI） germanate, Cs8U（UO2）3（Ge3O9）3·3H2O,[4d] U（V,VI） germanates, A3（U2O4）Ge2O7（A = Rb, Cs）,[4e] and a U（IV,V,VI） silicate, NaI7UIVO2（UVO）2（UV/VIO2）2Si4O16,[4f] in which three oxidation states of uranium co-exist in one compound. In addition, tetravalent-uranium compounds, Cs2USi6O15 and Cs4UGe8O20,[4g],[4h] were also synthesized. All members in the family of uranium silicates and germanates with the oxidation states of uranium from +4 to +6 have been observed. In addition to silicates and germanates, a mixed-valence U（V,VI） oxyhydroxide, Na5[U5O16（OH）2], was synthesized.[5] This mixed-valence compound is a possible intermediate phase of alteration products of uraninite.

关键词： uranium(V) silicate germanate oxyhydroxide hydrothermal

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