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to 5.0,aluminum in the lixivium can be effectively removed in the form of aluminum hydroxide precipitation with removal rate of 97.60%.It shows that hexamethylenetetramine has a good effect on the removing of aluminum ions from the lowconcentration lixivium.Moreover,hexamethylenetetramine in removing aluminum from lixivium has little adverse effect on the RE precipitation process.关键词:......
均匀共沉淀法合成纳米Gd2O3:Eu粉体及其发光特性刘志刚1,2,孙旭东1,李晓东1,连景宝11. 东北大学材料各向异性与织构教育部重点实验室2. 河北理工大学材料学院摘 要:以六次甲基四胺(hexamethylenetetramine,(CH2)6N4,HMT)为沉淀剂,在GdCl3和EuCl3混合溶液中,利用均匀共沉淀法制得了纳米颗粒.结果表明,获得的Gd2O3:Eu纳米颗粒近似为球形,尺寸均匀,平均粒径为100 nm,且每个球形颗粒由平均粒径为20 nm的微晶聚并而成.Gd2O3:Eu荧光粉在波长612 nm的红光发射来自Eu3+的5D0-7F2电偶极跃迁,发光强度随煅烧温度提高而增强,随Eu3+掺杂摩尔分数的提高而增强.Eu3+掺杂摩尔分数超过7%时,发生浓度淬灭,发光强度减弱.
polymeric precursor through copolymerization of lithium and manganese acetates with resorcinol and hexamethylenetetramine and then burning off the organic matrix at appropriate temperatures in air......
碱熔-催化极谱法直接测定矿石中微量铂王君玉1,李志伟1,韩敏1,程祎1(1.河南省郑州市河南省岩石矿物测试中心)摘 要:概述了催化极谱法测定矿石样品中铂的方法,并讨论了有效提高测定铂灵敏度的途径.实验结果表明,铂在硫酸-六次甲基四胺混合溶液中有很好的催化波,且在该底液中测定铂,其抗干扰能力强;铂的质量浓度在0.01 ng/mL~10μg/mL范围内呈线性关系.该方法对标准样品GBW 07291,GBW 07292和GBW 07293进行测试,分析结果令人满意.关键词:催化极谱法； 矿石； 微量铂；......
. Hydrochloric acid and oxalic acid were employed as the leaching and precipitation agents, respectively. Hexamethylenetetramine(HMTA) or tartaric acid was used as the chelating agent during leaching. Both......
by a simple hydrothermal method only through altering the addition amount of NH4F and hexamethylenetetramine(HMT). The phase structure, morphology and luminescence properties of the as-prepared samples were......
-formed, pristine indium tin oxide(ITO) and Si, using Zn(NO3)2$6H2O and hexamethylenetetramine(HMT) as the precursors. X-ray diffraction(XRD) and transmission electron microscopy(TEM) results indicated......
, thioacetamide, and a tiny amount of hexamethylenetetramine(HMTA) as starting materials. The HMTA molecule, which acted as a chelating agent and an oxidant, could not only tune the valence fluctuation of iron......
. Hydrochloric acid and oxalic acid were employed as the leaching and precipitation agents, respectively. Hexamethylenetetramine(HMTA) or tartaric acid was used as the chelating agent during leaching. Both......
by a simple hydrothermal method only through altering the addition amount of NH4F and hexamethylenetetramine(HMT). The phase structure, morphology and luminescence properties of the as-prepared samples were......
