回收LiCoO2中钴用螯合剂的合成及性能

以对甲基苯硫酚为原料,经过硝化、还原等反应合成4-甲基-2-氨基硫酚,研究了硝基还原成氨基的影响因素.当锌粉与硝基化合物的物质的量比为4:1,乙醇与水的比例为7:3、总体积为15 ml,温度为80℃时,产率为最高值76.2%.用5 ml pco<'2+>=1 194 ms/L的废旧锂离子电池浸出液进行螯合实验,螯合剂用...     

水热法合成4A沸石分子筛的影响因素及其合成机理

采用水热法制备了4A沸石分子筛,研究了煅烧温度、氢氧化钠浓度、凝胶形成时间、晶化时间等因素对4A沸石分子筛的晶型的影响.高岭土煅烧温度小于900℃时得到A型沸石,高于950℃时得囊P型沸石;氢氧化钠浓度小于5 mol/L时以P型沸石为主,大于5 mol/L时出现了一种新的沸石(Na6[A1SiO4]6·4H2O);凝胶形成时间长对X型沸石形成有利;晶化时间大于14 h时,出现的几乎全是P型沸石相,仅有少量的X型沸石相.     

二氢枯茗酸催化脱氢合成对异丙基苯甲酸的新方法

采用5％Pd／C作为转移氢催化剂,原料二氢枯茗酸为氢给予剂,以工业双戊烯作为氢接受剂和溶剂。合成了对异丙基苯甲酸．考察了催化剂用量、反应时间和反应温度对反应的影响,确定了合成对异丙基苯甲酸的最佳反应条件：5％Pd／C用量为原料的5．3％（质量比）、反应时间20min、在回流温度下,对异丙基苯甲酸的收率可达90％．催化剂重复使用5次后活性是原来的89％．     

锆、钛复合掺杂锂钴氧化物正极材料制备及电化学性能研究

以碳酸锂、氧化钴为主要原料,掺入化学计量的超细二氧化锆、超细二氧化钛,按球料比3:1,在转速500r/min经1h行星式球磨后,经900℃固相烧结制备了锂离子电池正极材料LiCo0.9Zr0.03Ti0.07O2,用X射线衍射(XRD)、扫描电镜(SEM)对材料的结构与形貌进行了研究,结果表明Li0.9Zr0.03Ti0.07O2与LiCoO2一样具有六方层状结构.在0.2C倍率下材料的初始放电容量达147mAh/g,2C倍率下初始放电容量达140.5mAh/g,3.6V放电平台比例达89.6%,500次循环后容量衰减7.5%,材料大电流放电性能好、循环寿命长.     

Syntheses and fluorescent properties of complexes of Eu（III） with HTTA, TPPO and benzoic acid

A series of Eu(III) complexes of α-thenoyltrifluoroacetone(HTTA) with trioctylphosphine oxide(TPPO) and benzoic acid(BA) or its two derivatives, p-toluic acid(PTA) and p-methoxybenzoic acid(POA) were synthesized and were characterized with elemental analysis, IR spectroscopy, scanning electronic microscopy and fluorescent spectra. The complexes were revealed to be Eu(BA)(TTA)₂TPPO₂, Eu(PTA)(TTA)₂TPPO₂ and Eu(POA)(TTA)₂TPPO₂. The excitation and absorption spectra of the complex Eu(POA)(TTA)₂TPPO₂ in MeOH solution were investigated in detail. The experimental result showed that relatively cheap materials with sharp red luminescence could be prepared, when benzoic acid or its two derivatives were added in Eu(III) complexes of α-thenoyltrifluoroacetone with trioctylphosphine oxide. The relative fluorescence intensity of the Eu(III) complexes decreased in the following order: Eu(POA)(TTA)₂TPPO₂> Eu(PTA)(TTA)₂TPPO₂>Eu(BA)(TTA)₂TPPO₂.     

4-甲基-2-羟基硫酚的合成及吸附性能研究

以对甲基苯硫酚为原料, 通过硝化、还原、重氮化等一系列反应合成了4-甲基-2-羟基硫酚。考察了重氮化过程中NaNO₂用量、硫酸浓度、反应温度以及水解时硫酸浓度对产率的影响。实验表明, 最佳工艺条件为: NaNO₂与4-甲基-2-氨基硫酚的摩尔比为2.10∶1, 硫酸浓度为3 mol/L, 反应温度为3 ℃, 水解时硫酸浓度为6 mol/L, 此条件下4-甲基-2-羟基硫酚的产率为71.2%。     

Comparative analysis of volatile constituents between herbal pair flos lonicerae-caulis lonicerae and its single herbs

Gas chromatography-mass spectrometry (GC-MS) and the chemometric resolution method (alternative moving window factor analysis, AMWFA) were used for comparative analysis of volatile constituents in herbal pair (HP) flos lonicerae-caulis lonicerae (FL-CL) and its single herbs. The temperature-programmed retention index (PTRI) was also employed for the identification of compounds. In total, 44, 39, and 50 volatile chemical components in volatile oil of FL, CL and HP FL-CL were separately determined qualitatively and quantitatively, accounting for 87.22%, 94.54% and 90.08% total contents of volatile oil of FL, CL and HP FL-CL, respectively. The results show that there are 32 common volatile constituents between HP FL-CL and single herb FL, 33 common volatile constituents between HP FL-CL and single herb CL, and 10 new constituents in the volatile oil of HP FL-CL.     

不同碳量对以Fe~(3+)为铁源合成的LiFePO_4/C电池正极材料性能的影响

用流变相法制备了 LiFePO4/C电池正极材料,利用XRD、SEM和EDS等技术对产物的微观结构和形貌进行了分析,并采用恒流克放电、循环伏安(CV)等测试技术测试了其电化学性能.重点探讨了不同碳量对LiFePO4正极材料晶体结构、形貌和电化学性能的影响.结果表明.制得的复合材料环境友好,具有平稳的3.4 V左右的充放电电压平台,导电性能和大电流充放电性能优良.