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Effect of precipitation pH and coexisting magnesium ion on phosphate adsorption onto hydrous zirconium oxide

Journal of Environmental Sciences 2019年第2期31卷 167-187页

作者： Jianwei Lin Xingxing Wang Yanhui Zhan College of Marine Ecology and Environment Shanghai Ocean University

To understand the effect of precipitation pH and coexisting Mg^(2+) on phosphate adsorption onto zirconium oxide(ZrO_2), ZrO_2 particles precipitated at pH 5.3, 7.1 and 10.5, i.e., ZrO_2(5.3), ZrO_2(7.1)and ZrO_2(10.5), respectively were prepared and characterized, then their adsorption performance and mechanism in the absence and presence of Mg^(2+) were comparatively investigated in this study. The results showed that the Elovich, pseudo-second-order and Langmuir isotherm models correlated with the experimental data well. The adsorption mechanism involved the complexation between phosphate and zirconium. Coexisting Mg^(2+) slightly inhibited the adsorption of phosphate on ZrO_2(5.3), including the adsorption capacity and rate, but coexisting Mg^(2+) greatly increased the adsorption capacity and rate for ZrO_2(7.1)and ZrO_2(10.5). The enhanced adsorption of phosphate on ZrO_2(7.1) and ZrO_2(10.5) in the presence of Mg^(2+) was mainly due to the formation of Mg^(2+)-HPO_4^(2-) ion pair(MgHPO_4~0) in the solution and then the adsorption of MgHPO_4~0 on the adsorbent surface, forming the phosphatebridged ternary complex Zr(OPO_3H)Mg. In the absence of Mg^(2+) , the maximum phosphate adsorption capacity at pH 7 calculated from the Langmuir isotherm model decreased in the order of ZrO 2(7.1)(67.3 mg/g) > ZrO_2(5.3)(53.6 mg/g) ≈ ZrO_2(10.5)(53.1 mg/g), but it followed the order of Zr O2(7.1)(97.0 mg/g) > ZrO_2(10.5)(79.7 mg/g) > ZrO_2(5.3)(51.3 mg/g) in the presence of Mg^(2+) . The results of this work suggest that ZrO_2(7.1) is more suitable for use as an adsorbent for the effective removal of phosphate from municipal wastewater than ZrO_2(5.3) and ZrO_2(10.5),because Mg^(2+) is generally present in this wastewater.

关键词： hydrous zirconium oxide Different precipitation pH values Adsorption Phosphate Magnesium ion Effect

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Geoscience material structures prediction via CALYPSO methodology

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Chinese Physics B 2019年第10期28卷 38-49页

作者： Andreas Hermann Centre for Science at Extreme Conditions and SUPA School of Physics and Astronomy The University of Edinburgh

Many properties of planets such as their interior structure and thermal evolution depend on the high-pressure properties of their constituent materials. This paper reviews how crystal structure prediction methodology can help shed light on the transformations materials undergo at the extreme conditions inside planets. The discussion focuses on three areas:(i) the propensity of iron to form compounds with volatile elements at planetary core conditions(important to understand the chemical makeup of Earth's inner core),(ii) the chemistry of mixtures of planetary ices(relevant for the mantle regions of giant icy planets), and(iii) examples of mantle minerals. In all cases the abilities and current limitations of crystal structure prediction are discussed across a range of example studies.

关键词： crystal structure prediction core materials planetary ices hydrous minerals

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High-Power and Ultralong-Life Aqueous Zinc-Ion Hybrid Capacitors Based on Pseudocapacitive Charge Storage

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Nano-Micro Letters 2019年第4期11卷 650-658页

作者： Liubing Dong Wang Yang Wu Yang Chengyin Wang Yang Li Chengjun Xu Shuwei Wan Fengrong He Feiyu Kang Guoxiu Wang Centre for Clean Energy Technology Faculty of ScienceUniversity of Technology SydneySydneyNSW 2007Australia School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002People’s Republic of China School of Photovoltaic and Renewable Energy Engineering University of New South WalesSydneyNSW 2052Australia Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China HEC Group Pty Ltd CanterburyVIC 3216Australia

Rechargeable aqueous zinc-ion hybrid capacitors and zincion batteries are promising safe energy storage *** this study,amorphous RuO2·H2O for the first time was employed to achieve fast and ultralong-life Zn2+storage based on a pseudocapacitive storage *** the RuO2·H2O||Zn zinc-ion hybrid capacitors with Zn(CF3SO3)2 aqueous electrolyte,the RuO2·H2O cathode can reversibly store Zn2+in a voltage window of 0.4-1.6 V(***/Zn2+),delivering a high discharge capacity of 122 mAh g?*** particular,the zinc-ion hybrid capacitors can be rapidly charged/discharged within 36 s with a very high power density of 16.74 kW kg?1 and a high energy density of 82 Wh kg?***,the zinc-ion hybrid capacitors demonstrate an ultralong cycle life(over 10,000 charge/discharge cycles).The kinetic analysis elucidates that the ultrafast Zn2+storage in the RuO2·H2O cathode originates from redox pseudocapacitive *** work could greatly facilitate the development of high-power and safe electrochemical energy storage.

关键词： Zinc-ion hybrid capacitor hydrous ruthenium oxide Ultralong life Redox pseudocapacitance High power

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Chromite in the Mantle Section of the Oman Ophiolite: Implications for the Tectonic Evolution of the Oman Ophiolite

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Acta Geologica Sinica(English Edition) 2015年第A02期89卷 73-76页

作者： ROLLINSON Hugh ADETUNJI Jacob University of Derby

Chronlite in the Oman ophiolite is located in the mantle section of the ophiolite sequence and forms abundant small poditbnndeposits throughout the length of the ophiolite （Rollinson. 2005）.The Oman ophiolite has an... 详细信息

关键词： RESEARCH Ophiolites hydrous Silicates Chlorite minerals Chromite Earth (Planet) MANTLE

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Thermokinetics on the reaction of formation of Dy[(C_(5)H_(8)NS_(2))_(3)(C_(12)H_(8)N_(2))]

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Science China Chemistry 2005年第Z1期48卷 74-78页

作者： GAO Shengli CHEN Sanping JIAO Baojuan SHUAI Qi SHI Qizhen Department of Chemistry Shaanxi Key Laboratory of Physico-lnorganic Chemistry Northwest University Xi'an 710069China Department of Chemistry Shaanxi Key Laboratory of Physico-lnorganic Chemistry Northwest University Xi'an 710069China Department of Chemistry Shaanxi Key Laboratory of Physico-lnorganic Chemistry Northwest University Xi'an 710069China Department of Chemistry Shaanxi Key Laboratory of Physico-lnorganic Chemistry Northwest University Xi'an 710069China Department of Chemistry Shaanxi Key Laboratory of Physico-lnorganic Chemistry Northwest University Xi'an 710069China

The enthalpy change of formation of the reaction of hydrous dysprosium chloride meter. Thermodynamic parameters (the activation enthalpy, the activation entropy and the activation free energy), rate constant and kinetics parameters (the apparent activation energy, the pre-exponential constant and the reaction order) of the reaction have also been calculated. The enthalpy change of the solid-phase reaction at 298.15 K has been obtained as (53.59 ± 0.29)liquid-phase and solid-phase reaction indicated that the complex could only be synthesized in liquid-phase reaction.

关键词： hydrous dysprosium chloride, ammonium pyrrolidinedithiocarbamate (APDC), 1,10-phenanthroline(o-phen), microcaiorimetry, thermochemistry.

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