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Selective recovery of Th(Ⅳ) from radioactive rare earth waste residue by utilizing MoS_(2)-modified ion-absorbed type rare earth tailings

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Journal of Rare Earths 2024年第9期42卷 1782-1791,I0005页

作者： xirong chen Xinyu Fu Yun Gao Zhiyuan Zeng Bin Huang Xiaoqi Sun Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China Fujian Research Center for Rare Earth Engineering Technology Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen361021China Fujian College University of Chinese Academy of SciencesFuzhou350002China Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths Ganjiang Innovation AcademyChinese Academy of SciencesGanzhouJiangxi341000China

In the process of extracting ion-absorbed rare earth ore(IREO),the production of radioactive waste is a major environmental *** address this issue,MoS_(2) was used to modify ion-absorbed rare earth tailings(RET) to synthesize a novel MoS_(2)@RET composite material for the effective handling of radioactive waste generated in IREO separation *** composite material was thoroughly characterized using various analytical techniques,including X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),thermogravimetry(TG),Fourier-transform infrared(FTIR),scanning electron microscopy(SEM),Brunaue r-Emmett-Teller(BET) and energy dispersive spectroscopy(EDS).By optimizing the operating parameters,the optimal experimental conditions were determined to be pH=3,contact time=60 min,liquid-solid ratio=6 g/L,and initial concentration=150 mg/*** adsorption data fitted well with the pseudo second-order rate *** thermodynamic parameters concerning the adsorption of Th(Ⅳ) were analyzed and *** isotherm model is a more fitting choice for the adsorption process compared to the Freundlich isotherm ***_(2)@RET was used in the acid leachate of IREO waste residue,achieving the separation of Th and rare earth *** mechanism of Th(Ⅳ) adsorption by MoS_(2)@RET was investigated,revealing that the adsorption process involves electrostatic interactions,chemical bonding,and redox *** above research results indicate that MoS_(2)@RET composite materials have application potential in the sustainable treatment of IREO radioactive waste.

关键词： Rare earths Thorium Radioactive waste residue Adsorption Separation

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FDCA,FDME,2,5-呋喃二甲酸聚酯的工业开发及应用研究进展

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合成树脂及塑料 2024年第5期41卷 68-72页

作者：陈锡荣中国石油化工股份有限公司化工事业部北京100728

具有芳杂环结构的2,5-呋喃二甲酸(FDCA)与精对苯二甲酸(PTA)结构类似,可广泛用于聚酯、聚酰胺、金属有机骨架材料、医药化学品合成、增塑剂等方面,在多个领域成为PTA理想的生物基替代品。目前,市场尚无FDCA,2,5-呋喃二甲酸二甲酯(FDME),... 详细信息

具有芳杂环结构的2,5-呋喃二甲酸(FDCA)与精对苯二甲酸(PTA)结构类似,可广泛用于聚酯、聚酰胺、金属有机骨架材料、医药化学品合成、增塑剂等方面,在多个领域成为PTA理想的生物基替代品。目前,市场尚无FDCA,2,5-呋喃二甲酸二甲酯(FDME),聚2,5-呋喃二甲酸乙二酯(PEF)的工业化产品,FDCA,PEF由于生产成本高、技术难度大,仍处于研究阶段。欧洲、北美等国家在持续推动FDCA,FDME及PEF商业化工作中保持领先,其中,PEF对CO_(2),O_(2),H_(2)O的阻隔性能极好,将在生鲜食品包装领域有着广阔的应用前景。

关键词： 2,5-呋喃二甲酸 2,5-呋喃二甲酸二甲酯聚2,5-呋喃二甲酸乙二酯聚酯发展趋势

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Selective Oxidation of CO in Excess H_2 over Ru/Al_2O_3 Catalysts Modified with Metal Oxide

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Journal of Natural Gas Chemistry 2007年第4期16卷 409-414页

作者： xirong chen Hanbo Zou Shengzhou chen Xinfa Dong Weiming Lin School of Chemical and Energy Engineering South China University of Technology Guangzhou 510651 Guangdong China School of Chemistry and Chemical Engineering Guangzhou University Guangzhou 510006 Guangdong China

The Ru/Al2O3 catalysts modified with metal oxide （K20 and La2O3） were prepared v/a incipient wetness impregnation method from ***2O mixed with nitrate loading on Al2O3 support. The activity of catalysts was evaluated under simulative conditions for the preferential oxidation of CO （CO-PROX） from the hydrogen-rich gas streams produced by reforming gas, and the performances of catalysts were investigated by XRD and TPR. The results showed that the activity temperature of the modified catalysts Ru-K20/Al2O3 and Ru-La2O3/Al2O3 were lowered approximately 30℃ compared with pure Ru/Al2O3, and the activity temperature range was widened. The conversion of CO on Ru-K20/Al2O3 and Ru-La2O3/Al2O3 was above 99% at 140-160℃, suitable to remove CO in a hydrogen-rich gas and the selectivity of Ru-La2O3/Al2O3 was higher than that of Ru-K2O/Al2O3in the active temperature range. Slight methanation reaction was detected at 220℃ and above.

关键词： hydrogen-rich gas ruthenium based catalysts CO removal selective oxidation metal oxide

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La、Co金属共掺杂TiO_(2)光催化材料的降解活性及动力学研究

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材料导报 2024年第S1期38卷 73-76页

作者：谭俊陈喜蓉陈文斌汤昌财聂子旋林刘鹏陈早明江西理工大学化学化工学院江西赣州341000

为提高二氧化钛光催化降解效率,采用水热法合成了稀土La及过渡金属Co共掺杂的TiO_(2)复合光催化剂,并通过扫描电镜(SEM)、X射线衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)等手段对材料进行了表征。以甲基橙和罗丹明B为模型污染物,研... 详细信息

为提高二氧化钛光催化降解效率,采用水热法合成了稀土La及过渡金属Co共掺杂的TiO_(2)复合光催化剂,并通过扫描电镜(SEM)、X射线衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)等手段对材料进行了表征。以甲基橙和罗丹明B为模型污染物,研究La及Co共掺杂TiO_(2)光催化剂上催化降解活性,并对其催化降解动力学进行初步讨论。结果表明:水热法制得复合催化剂的形貌为球形结构,其中TiO_(2)为金红石相晶型,共掺杂后TiO_(2)的晶体结构未发生改变;La、Co共掺TiO_(2)复合材料的降解能力相比纯TiO_(2)有显著提高。当溶液浓度均取5 ppm时,1%(Co+La)/TiO_(2)催化剂上甲基橙溶液降解率为85.45%,1%(Co+La)/TiO_(2)催化剂上罗丹明B溶液降解率为94.56%。反应遵循Langmuir-Hinshelwood模型,具有一级反应动力学特征。

关键词：金属共掺杂二氧化钛光催化降解染料废水反应动力学

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Analysis of temperature inversion in the Zhujiang River Estuaryin July 2015

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Acta Oceanologica Sinica 2019年第4期38卷 167-174页

作者： xirong chen Zhenyu Sun Hongyang Lin Jia Zhu Jianyu Hu State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen University

This study investigates the temperature inversion phenomenon in the Zhujiang(Pearl) River Estuary(ZRE) using hydrological data collected in a summer cruise during July 6–17, 2015. The results suggest that temperature inversion occurred primarily near the salinity front, with an average temperature difference(ΔT) of 0.42°C between the inversion layer and the underlying water. The inversion layer was approximately 4 m thick on average, with an upper boundary at a depth of 1–6 m and a lower boundary at a depth of 3–10 m. Different mechanisms and dynamic processes were responsible for temperature inversion in different parts of the study area.(1) At the salinity front in the west of the ZRE, the measurements collected by CTD(conductivity,temperature, and depth) showed that the low-salinity water mass on the inner side of the front was approximately2°C cooler than the high-salinity water mass on the outer side. Temperature inversion occurred when the cooler low-salinity water overlapped the warmer high-salinity water near the front due to the driving force of the background flow.(2) Inversion layers occurred at the mouth of the Taiping waterway as a result of varying horizontal flow between two different water masses under the effects of tides and runoff.(3) To the southwest of Hong Kong, temperature inversion occurred due to the interaction of upwelling and the salinity front.

关键词： Zhujiang(Pearl)River Estuary temperature inversion summer

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Additive effects of alkaline-earth metals and nickel on the performance of Co/γ-Al_2O_3 in methane catalytic partial oxidation

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Journal of Natural Gas Chemistry 2011年第2期20卷 135-139页

作者： Changlin Yu Weizheng Weng Qing Shu Xiangjie Meng Bin Zhang xirong chen Xiaochun Zhou School of Materials and Chemical Engineering Jiangxi University of Science and Technology Ganzhou 341000 Jiangxi China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry Xiamen University Xiamen 361005 Fujian China

Nano-sized γ-alumina （γ-Al2O3） was first prepared by a precipitation method. Then, active component of cobalt and a series of alkaline- earth metal promoters or nickel （Ni） with different contents were loaded on the γ-Al2O3 support. The catalysts were characterized by N2 adsorption-desorption, X-ray diffraction （XRD） and thermogravimetry analysis （TGA）. The activity and selectivity of the catalysts in catalytic partial oxidation （CPO） of methane have been compared with Co/γ-Al2O3, and it is found that the catalytic activity, selectivity, and stability are enhanced by the addition of alkaline-earth metals and nickel. The optimal loadings of strontium （Sr） and Ni were 6 and 4 wt%, respectively. This finding will be helpful in designing the trimetallic Co-Ni-Sr/γ-Al2O3 catalysts with high performance in CPO of methane

关键词： alkaline-earth metal cobalt-based catalyst γ-alumina catalytic partial oxidation methane

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结构催化剂耦合反应精馏的化工过程强化技术在化工分离工程实验教学中的设计与探索

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广东化工 2024年第17期51卷 243-245,206页

作者：邓涛陈喜蓉朱丽华李金辉江西理工大学化学化工学院江西赣州341000

设计了一个结构催化剂耦合反应精馏技术一步合成乙酸环己酯同时利用精馏过程分离环己烯/环己烷的化工分离工程专业实验。首先,采用浸渍涂敷法合成高效稳定的Nafion-SiO_(2)/SS-fiber结构催化剂。然后,对结构催化剂的物理化学性质进行表... 详细信息

设计了一个结构催化剂耦合反应精馏技术一步合成乙酸环己酯同时利用精馏过程分离环己烯/环己烷的化工分离工程专业实验。首先,采用浸渍涂敷法合成高效稳定的Nafion-SiO_(2)/SS-fiber结构催化剂。然后,对结构催化剂的物理化学性质进行表征。最后,通过单因素实验和响应面优化分析反应精馏工艺参数对催化剂性能的影响。本实验的开展有助于学生理解和掌握精馏章节的相关理论知识和技术工艺,能够帮助学生正确使用精馏装置,理解精馏计算的基本原理。化工过程强化等化工前沿技术融入化工分离工程实验教学将有助于培养学生的科研素养,拓宽学生知识创新视野。

关键词：结构催化剂反应精馏响应面分析化工过程强化化工分离工程

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基于CBI教学理念的混合式教学模式探析——以“商务英语”课程教学为例

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中国电化教育 2019年第12期 129-134页

作者：陈曦蓉闽江学院外国语学院

该文依据内容依托式(CBI)教学理念,探索分析了基于慕课与雨课堂的线上线下混合式教学方式在商务英语课程教学中的应用模式及启示。教学实践表明:基于CBI理念设计与实施的线上线下混合式教学模式,把语言教学建构在商务知识教学之上,促进... 详细信息

该文依据内容依托式(CBI)教学理念,探索分析了基于慕课与雨课堂的线上线下混合式教学方式在商务英语课程教学中的应用模式及启示。教学实践表明:基于CBI理念设计与实施的线上线下混合式教学模式,把语言教学建构在商务知识教学之上,促进了学生在跨文化语境中使用英语进行有效的商务交流,有助于课程教学目标的实现。同时,基于慕课与雨课堂的混合式教学模式是现代信息技术与课堂教学深度融合的课堂革命,它充分发挥了线上和线下两种教学的优势,拓展了教与学的时间和空间,重构传统课堂教学,提高了学生学习积极性和活跃度,通过创新教学方法促进外语教学改革并提升课程教学质量。

关键词： CBI教学理念商务英语混合式教学慕课与雨课堂

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Increased excitatory amino acid transporter 2 levels in basolateral amygdala astrocytes mediate chronic stress–induced anxiety-like behavior

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Neural Regeneration Research 2025年第6期20卷 1721-1734页

作者： xirong Xu Shoumin Xuan Shuai chen Dan Liu Qian Xiao Jie Tu Shenzhen Key Laboratory of Neuroimmunomodulation for Neurological Diseases Shenzhen-Hong Kong Institute of Brain ScienceShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong ProvinceChina CAS Key Laboratory of Brain Connectome and Manipulation Brain Cognition and Brain Disease Institute(BCBDI)Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong ProvinceChina Guangdong Provincial Key Laboratory of Brain Connectome and Behavior the Brain Cognition and Brain Disease Institute(BCBDI)Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong ProvinceChina University of Chinese of Academy of Sciences BeijingChina Faculty of Life and Health Sciences Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong ProvinceChina

The conventional perception of astrocytes as mere supportive cells within the brain has recently been called into question by empirical evidence, which has revealed their active involvement in regulating brain function and encoding behaviors associated with ***, astrocytes in the basolateral amygdala have been found to play a role in the modulation of anxiety-like behaviors triggered by chronic stress. Nevertheless, the precise molecular mechanisms by which basolateral amygdala astrocytes regulate chronic stress–induced anxiety-like behaviors remain to be fully elucidated. In this study, we found that in a mouse model of anxiety triggered by unpredictable chronic mild stress, the expression of excitatory amino acid transporter 2 was upregulated in the basolateral amygdala. Interestingly, our findings indicate that the targeted knockdown of excitatory amino acid transporter 2 specifically within the basolateral amygdala astrocytes was able to rescue the anxiety-like behavior in mice subjected to stress. Furthermore, we found that the overexpression of excitatory amino acid transporter 2 in the basolateral amygdala, whether achieved through intracranial administration of excitatory amino acid transporter 2agonists or through injection of excitatory amino acid transporter 2-overexpressing viruses with GfaABC1D promoters, evoked anxiety-like behavior in mice. Our single-nucleus RNA sequencing analysis further confirmed that chronic stress induced an upregulation of excitatory amino acid transporter 2 specifically in astrocytes in the basolateral amygdala. Moreover, through in vivo calcium signal recordings, we found that the frequency of calcium activity in the basolateral amygdala of mice subjected to chronic stress was higher compared with normal *** knocking down the expression of excitatory amino acid transporter 2 in the basolateral amygdala, the frequency of calcium activity was not significantly increased, and anxiety-like behavior was ob

关键词： anxiety astrocytes basolateral amygdala behavior dihydrokainic acid excitatory amino acid transporter 2 fiber photometry glutamate LDN-212320 transporter

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论毛泽东的主观能动性思想的理论贡献

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江汉论坛 2010年第5期 27-30页

作者：陈喜荣中国人民大学国际关系学院

毛泽东的主观能动性思想是马克思主义认识论与中国革命和实践相结合的创造性发展,这一思想发展了马克思主义哲学,对马克思主义哲学有五大理论贡献。第一,毛泽东第一次明确提出"主观能动性"的科学概念,形成了对主体观念及改造与重建极其... 详细信息

毛泽东的主观能动性思想是马克思主义认识论与中国革命和实践相结合的创造性发展,这一思想发展了马克思主义哲学,对马克思主义哲学有五大理论贡献。第一,毛泽东第一次明确提出"主观能动性"的科学概念,形成了对主体观念及改造与重建极其重视的思想体系。第二,毛泽东第一次提出了在一定时候、一定条件下主观决定客观这一创新论断。第三,毛泽东强调领导和先进知识分子的主观能动性与广大普通群众的主观能动性相结合,这是他关于主观能动性思想的又一突出理论贡献。第四,毛泽东指出"认识世界改造世界"就是"认识矛盾解决矛盾",这一思想极大地丰富了马克思主义实践主体性思想。第五,强调意志的能动性是毛泽东主观能动性思想的显著特点。

关键词：主观客观主观能动性意志

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