共搜索到35490条信息,每页显示10条信息,共3549页。用时:0小时0分0秒640毫秒
on the metal-ion-doped TiO2 mainly focus on the crystalloid TiO2 and little attention has been paid to the amorphous TiO2 due to its lack of photocatalytic activity. As amorphous ZnS and CdS are ready... in the occurrence of various regional energy levels in the crystalloid band and meliorate the absorption capability of the visible light[10]. Doping metal ions into amorphous TiO2 can also meliorate......
-based amorphous/ nanocrystalline composites can be obtained by partial crystallization of the amorphous alloys[3-7]. The Al-based amorphous/nanocrystalline alloys containing transition metal (TM=Fe, Co... of rapidly solidified Al87Ni7Cu3Nd3 amorphous alloy prepared by melt spinning method XIAO Yu-de(肖于德)1, 2, LI Min(李 敏)1, ZHONG Jue(钟 掘)2, LI Wen-xian(黎文献)1, MA Zheng-qing(马正青)1 (1. School of Materials......
Performance of positive and negative electrodes in amorphous manganese oxide supercapacitor ZHANG Ying(张 莹)1, LIU Kai-yu(刘开宇)1, 2, ZHANG Wei(张 伟)1, SU Geng(苏 耿)2 1. School... 2007; accepted 10 September 2007 Abstract: Using potassium permanganate and acetic manganese as the reactants, amorphous manganese oxide was prepared with mechanochemical method. XRD was used......
: contaminated soil; giant reed; heavy metal; leaching characteristics 近代工业活动大大加速了重金属的生物地球化学循环进程,导致重金属向环境中释放加快.尤其是矿区,冶炼区及其污染区土壤,农作物中重金属污染对人体健康风险大增[1-3].As,Cd和Pb等造成的环境污染问题在矿冶区比较突出[4-5].开展矿冶区土壤中重金属污染的控制与治理已...主的湖南某冶炼区典型污染土壤,在以芦竹为目标植物的生态修复田间试验基地上,探讨长期田间试验体系中As,Cd,Pb和Zn在土壤-植物-水中的迁移与渗漏特征,考察芦竹修复体系对其地下水中重金属污染的控制效果,评价利用芦竹进行土壤重金属污染修复的可行性. 1 材料与方法 1.1 供试土壤和植物 田间长期定位试验基地为位于湖南某拥有50多年铅锌冶炼历史的大型冶炼企业周边一废水......
关于控制阴极锌Pb含量的探讨辛现军巴彦淖尔紫金有色金属有限公司摘 要:分析了电积锌过程中铅的沉积原理,提出了降低阴极锌铅含量的措施关键词:电解液;铅含量;阴极锌;......
柠檬酸铅Pb(C6H6O7)·H2O热分解特性研究朱新锋1,2,杨家宽2,胡雨辰2,李磊2,汪潇1,2,张伟2,孙晓娟2,郭一飞1,陈松涛11. 河南城建学院市政与环境工程学院2. 华中科技大学环境科学与工程学院摘 要:采用热重与红外联用等技术研究了柠檬酸铅Pb(C6H6O7)·H2O的热分解过程.结果表明:柠檬酸铅在空气中热分解过程可大致分为脱水,热分解及燃烧3个阶段.在热分解初始反应均为结晶水的失去,在200280℃范围内部分有机物产生,而此后主要产物为二氧化碳,最终产物为氧化铅与金属铅.焙烧温度对柠檬酸铅在空气中分解起到关键性的作用.柠檬酸铅前驱物Pb(C6H6O7)·H2O在低温时主要焙烧产物是α-PbO,β-PbO与金属铅,温度较高时焙烧产物为β-PbO.在400450℃范围内延长反应时间可......
Competitive adsorption of Cu(II) and Pb(II) ions from aqueous solutions by Ca-alginate immobilized activated carbon and Saccharomyces cerevisiaeLU Ming(卢明)1, 2, LIU Yun-guo(刘云国)1, 2, HU Xin-jiang(胡新将... metals, the adsorption of Cu(II) and Pb(II) ions from their single and binary systems by Ca-alginate immobilized activated carbon and Saccharomyces cerevisiae (CAS) was investigated. The CAS beads......
Study on Physical Process of Surface Oxidation of Rare Earth-Transition Metal Amorphous Magneto-Optical Thin Films沈德芳,金丽娜,俞祥游,王丽娟摘 要:<正> By using...-transition metal amorphous magneto-optical thin films was studied in this paper.The rare earth elementsoxidize preferentially and rich at the film surface,and the transition metals deplete in oxidation......
. The action of SiO2 in leaching solution was also studied. The results showed that the precipitation and settlement of SiO2(amorphous) adsorbed part of metal ions in solution, which greatly inhibited... The precipitated SiO2(amorphous) absorbed on the mineral surface did not react, which inhibited the leaching of other compounds and absorbed the metal ions dissolved. That was why the leaching rates......
......