金属离子和氧化剂对间苯二酚光化学降解的影响

在实验条件下，Mn^2 /Fe^2 /Cu^2 /Zn^2 /Al^3 /La^3 ,KMnO4/K2S2O8/KBrO3/KIO3/KIO4对间苯二酚光化学降解起加速作用，且随浓度增大而增强。KBrO3 Fe^2 ,KIO4 Mn^2 对间苯二酚光化学降解的加速作用更为显著。无光照射时，KMnO4,K2S2O8/KBrO3 Fe^2 ,KIO4 Mn^2 /Fe^2 都能够使间苯二酚立刻发生化学降解，尤其以KMnO4,KIO4 Mn^2 的作用更为显著。     

锂离子电池正极材料LiMnPO_4/C的合成研究

以间苯二酚甲醛树脂作碳源,由固相法合成LiMnPO4/C复合材料.研究不同合成温度和时间对产物形貌、结构以及电化学性能的影响.结果表明,600℃热处理3 h制得的LiMnPO4/C粒径细小且分布均匀,一次颗粒粒径100～300 nm.0.02C下首次放电容量达到121.6 mAh.g-1,充放电循环20次仍可维持在11...     

Chemical Speciation of Antimony(III and V) in Water by Adsorptive Cathodic Stripping Voltammetry Using the 4‐(2‐Thiazolylazo) – Resorcinol

A simple adsorptive cathodic stripping voltammetry method has been developed for antimony (III and V) speciation using 4‐(2‐thiazolylazo) – resorcinol (TAR). The methodology involves controlled preconcentration at pH 5, during which antimony(III) – TAR complex is adsorbed onto a hanging mercury drop electrode followed by measuring the cathodic peak current (I_p,c) at ?0.39 V versus Ag/AgCl electrode. The plot of I_p,c versus antimony(III) concentration was linear in the range 1.35×10^?9–9.53×10^?8 mol L^?1.The LOD and LOQ for Sb(III) were found 4.06×10^?10 and 1.35×10^?9 mol L^?1, respectively. Antimony(V) species after reduction to antimony(III) with Na₂SO₃ were also determined. Analysis of antimony in environment water samples was applied satisfactorily.     

光度检测-低压离子色谱法同时分析水溶液中铜、锌

用吡啶-(2-偶氮-4-)雷琐辛(PAR)作柱后衍生剂,在优化的衍生和色谱条件下,使用可见光检测一低压离子色谱法同时测定了水溶液中铜和锌。在低压阳离子色谱柱上,用酒石酸．柠檬酸作流动相,在520nm处检测,得到线性良好的工作曲线,铜和锌的检出限均为0．05μg／mL。利用该法分析了环境水样中的铜和锌,其标准加入回收率分别为99％～102％,97％～104％。     

PAR基红麻纤维的制备及其对Ni2+、Cu2+、Cd2+的吸附性研究

红麻纤维经环氧基活化后与吡啶(2-偶氮-4)间苯二酚(PAR)接枝反应．制得一种改性红麻纤维,测定了谈纤维对Ni^2 、Cu^2 、Cd^2 的吸附性能．结果表明：在一定条件下，改性纤维对Cu^2 、Cd^2 的吸附性能较好。而对Ni^2 的吸附性能一般．     

2-硝基间苯二酚制备工艺的优化

介绍了2 硝基间苯二酚的应用,研究了制备2 硝基间苯二酚的优化工艺.22.00g间苯二酚与60.00g硫酸发生磺化反应,然后与52.00g混酸(含HNO30.28mol,w(HNO3):w(HAc):w(H2SO4)=1g:0.5g:0.5g)在5～10℃进行硝化反应6h,再用水蒸汽蒸馏出2 硝基间苯二酚14.96g,总收率48.27%.     

The solvent extraction and spectrophotometric determination of vanadium (V) with 4-(2-thiazolylazo)resorcinol and tetrazolium salts

The formation and extraction of ion-associate complexes between the vanadium(V)-4-(2-thiazolylazo)resorcinol (TAR) anionic chelate and the cations of some mono-and ditetrazolium salts {3-(4,5-dimethyl-2-thiazol)-2,5-diphenyl-2H-tetrazolium bromide (Thiazolyl blue, MTT), 3-(2-naphtyl)-2,5-diphenyl-2H-tetrazolium chloride (Tetrazolium violet), 2-(4-iodophenyl)-3-(4-nitrophenyl)-5-phenyl-2H-tetrazolium chloride (Iodonitrotetrazolium chloride), 3,3′-[3,3′-dimetoxy(1,1′-biphenyl)-4,4′-diyl]-bis[2,5-diphenyl-2H-tetrazolium] chloride (Tetrazolium blue chloride) and 3,3′-(3,3′-dimetoxy-4,4′-biphenylene)bis[2-(4-nitrophenyl)-5-phenyl-2H-tetrazolium chloride] (Nitro blue tetrazolium chloride)} have been studied. The optimum extraction conditions have been found. The composition of the V-TAR-monotetrazolium and V-TAR-ditetrazolium complexes extracted into chloroform has been determined to be 1:2:3 and 2:4:3 respectively. The extraction, distribution and association constants, and the recovery factors have been calculated. The relationship between the molecular weight of tetrazolium cations, and the association constants of their complexes has been discussed. The special behavior of the tetrazolium cations, containing-NO₂ groups has been noticed. The effects of foreign ions and reagents on the extraction of vanadium with TAR and the best tetrazolium salt-MTT have been studied. A sensitive, selective, simple and fast method for the determination of vanadium has been developed.      

红麻纤维改性及其对Ni2+、Cu2+、Cd2+的吸附性研究

向天然纤维链上吸附性功能基制得的改性纤维不仅对金属离子的吸附容量,而且能应用于废水处理和环境保护等诸多领域。如果将大量废弃残麻接枝改性为对应吸附材料,并用于治理废水污染,则更具“双废开发,双废利用”价值。我们以信阳盛产的红麻纤维为母体,选取4-(2-吡啶偶氮)间苯二酚为功能基,在相关工作基础上,制备了4-(2-吡啶偶氮)间苯二酚基红麻纤维。同时,测试红麻纤维对Ni^2 、Cu^2 、Cd^2 的吸附性能,探讨了吸附温度、时间及介质酸度等因素对吸附的影响。     

因子分析-导数光度法同时测定苯酚、间苯二酚、对苯二酚混合体系的比较

同时采集多事体系的紫外基谱和一阶导数光谱数据,用因子分析技术地两套数据进行分析对比,结果表明一阶导数光谱数据经因子分析法同时测定混合多酚所得结果明显优于基本光谱数据经因子分析法所得结果,具有明显的消除背景干扰,提高灵敏度等优点。     

SiO_2/间苯二酚杂化溶胶前驱体法制备SiO_2/SiC多孔纤维

本文采用溶胶-凝胶法制备间苯二酚/SiO_2杂化溶胶,拉丝法制取杂化纤维.并采用FT-IR、DSC、TG、XRD和SEM对杂化纤维进行了表征.结果表明,杂化纤维中部分间苯二酚与SiO_2形成共价键结构;杂化纤维呈非晶态.采用不同温度对杂化纤维进行热处理,得到的产物经1300 ℃处理后杂化纤维转变为SiO_2/SiC结晶性多孔纤维.