Results 11 to 20 of about 1,433,687 (138)
, 2017 方解石是自然环境中最常见的矿物之一,具有较强的表面活性,是控制金属离子活动最重要的碳酸盐矿物。一方面,方解石可以通过表面吸附、离子交换及类质同象置换等反应固定Cu~(2+)、Pb~(2+)、Co~(2+)、Cd~(2+)等重金属离子,从而减轻重金属污染;另一方面,方解石在一定条件下会发生溶解,此时,原本固定在方解石中的重金属离子会再次迁移到环境中,对环境造成二次污染。所以 ...
张晓航, 陈繁荣, 吴世军
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Zhejiang Daxue xuebao. Lixue ban, 2011 奥陶系碳酸盐岩储层是塔中地区重要的油气产层.测定塔里木盆地奥陶系热液矿物（方解石、石膏、重晶石等）及围岩的碳氧同位素以及锶同位素，分析结果显示，热液溶蚀围岩后释放的CO2可能是形成方解石中特征氧同位素组成的主控因素；自生碳酸岩矿物的碳同位素组成反映其在成岩期至少有2种碳源，早期形成的碳酸盐岩与二叠纪富13C的碳源相关，成岩早期至晚期的碳酸盐岩的沉淀或重结晶可能与由局部地质事件导致流体在沿裂缝系统运移时混合了有机质降解过程中产生的富12C的CO2有关；87Sr/86Sr值(0.708~0.718 ...
GAOQi-dong(高奇东) +6 more
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Dehydrogenation Thermodynamic and Kinetic Challenges of Mg‐Ni‐Based Alloy Hydrides
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Solid‐state hydrogen storage stands as a pivotal, safe, and efficient solution for the future hydrogen economy. Among diverse hydrogen storage systems, Mg‐Ni‐based alloy hydrides are recognized as cornerstone materials. However, their practical application is hindered by two core challenges: the high thermodynamic stability of the hydride ...
Jinglan He +6 more
wiley +1 more source
Dialectical Geopolitics in the Multipolar Energy Era
World Affairs, Volume 189, Issue 3, Fall 2026.ABSTRACT This paper develops a dialectical geopolitics–geoeconomics framework for interpreting the restructuring of globalization and the emergence of a multipolar energy era. It operationalizes nine dialectical prerequisites as a diagnostic “protocol” for international relations/international political economy (IR/IPE): specify endogenous ...
Dimos Chatzinikolaou
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, 2014 石笋矿物由文石转变为方解石,其碳、氧同位素组成如何变化的认识对于古环境研究具有重要意义。选取江西省神农宫洞石笋SN15进行研究,X衍射分析测试证明其主体部分的矿物组成为文石,部分位置文石转变为方解石。相同层位文石和转变方解石的碳、氧同位素组成分析结果表明,转变方解石与原生文石相比,δ~(13)C值几乎没有变化;而δ~(18)O值明显偏负,且不是系统性偏负,偏负范围为0.2‰~1.4‰。因此,原生文石记录的降水氧同位素组成在矿物转变时受到扰动 ...
蔡演军[1] +3 more
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Hierarchical Structured TiO2/Boron‐Doped Diamond for Efficient Photo‐Electrocatalytic Degradation
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT The discharge of refractory organic dye wastewater poses a significant threat to the ecological environment, necessitating the development of efficient treatment technologies. Herein, a uniform TiO2 array (TiO2‐AR) electrode is fabricated using a combination of magnetron sputtering and a mask plate process with a boron‐doped diamond (BDD ...
Haiming Sun +10 more
wiley +1 more source
Engineering Geometric Active Sites in Cobalt Spinel Oxides for Energy and Environmental Catalysis
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Cobalt‐based spinel oxides (Co3O4 and derivatives) are among the most promising transition metal oxides for electrochemical energy conversion and environmental catalysis due to their abundant active sites, structural tunability, and robust redox flexibility.
Shenning Liu +6 more
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Metal oxide‐based catalysts for oxygen reduction reaction (ORR) have drawn great attention in recent years. However, it remains technically challenging for the precise regulation of the overall performance due to the trade‐off effect among the activity, selectivity, and stability of electrocatalysts. Herein, a balancing strategy to control the
Haoran Ma +7 more
wiley +1 more source
Lessons from an eradication under multiple constraints of an island rat population of record density
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Invasive rats threaten island biodiversity, disrupting ecosystems and endangering native species. Although rat eradication has succeeded on many islands, tropical islands present unique management challenges. Strict regulations and financial constraints on some tropical islands further limit proven eradication methods, complicating rodent ...
Tatiane Micheletti +7 more
wiley +1 more source
Gongye shui chuli水体中的镉、砷等重金属污染严重威胁人类的健康安全，其中镉/砷复合污染去除难度更大。通过水中镉/砷复合污染去除试验，探究机械力活化方解石复合硫酸亚铁去除镉/砷复合污染的性能，发现机械力活化方解石可显著提升水中镉/砷复合污染的去除效果。试验结果表明，活化方解石复合硫酸亚铁在30 min内对溶液中镉、砷离子的去除率可达到99%以上。采用SEM-EDS、XRD、XPS等方法对活化方解石复合硫酸亚铁高效去除水中镉/砷复合污染机理进行研究，结果表明，方解石在机械力活化的作用下改变了自身的结晶度和溶解活性 ...
苗艳晖 +4 more
doaj +2 more sources