共查询到18条相似文献,搜索用时 531 毫秒
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(I) 引言α-二硝基苯酚学名2, 4-二硝基苯酚〔2,4-C_6H_3OH(NO_2)_2〕,是一种淡黄到黄色的粉状結晶,熔点112.9℃,通常用2,4-二硝基氯化苯經碱性水解而成,工业品主要用于制造硫化染料,4-硝基,2-氨基苯酚和盐酸2,4-二氨基苯酚等。β-二硝基苯酚学名2,6-二硝基苯酚〔2,6-C_6H_3OH(NO_2)_2〕,系黄色至亮黄色結晶,熔点63~64℃,在比色法测定中用为单色pH指示剂,其顔色变化由无色至黄色, 相似文献
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文章建立了水溶肥料中复硝酚钠的高效液相色谱分析方法。使用ODS反相柱和紫外可变波长检测器,以甲醇加水(用H3PO4调至pH=3.0)为流动相,外标法对对硝基酚钠、2,4-二硝基酚钠和邻硝基酚钠进行定量分析。对硝基苯酚钠在37.33~186.66μg/mL线性范围内,线性相关系数r为0.9982,2,4-二硝基苯酚钠在41.07~205.37μg/mL线性范围内,线性相关系数r为0.9974,邻硝基苯酚钠在40.04~200.19μg/mL线性范围内,线性相关系数r为0.9976;方法的偏差为6.0×10-5(对硝基苯酚钠)、3.4×10-5(2,4-二硝基苯酚钠)、1.2×10-5(邻硝基苯酚钠),变异系数分别为0.45%(对硝基苯酚钠)、0.35%(2,4-二硝基苯酚钠)、0.12%(邻硝基苯酚钠);平均回收率为99.78%(对硝基苯酚钠)、99.758%(2,4-二硝基苯酚钠)、99.158%(邻硝基苯酚钠),变异系数分别为0.34%(对硝基苯酚钠)、0.51%(2,4-二硝基苯酚钠)、0.48%(邻硝基苯酚钠)。 相似文献
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以KMnO4和MnSO4·H2O为原料,在常温常压和水热条件下制备新生态MnO2,借助XRD、TEM、低温N2吸附-脱附等手段对材料进行表征,比较不同制备方法对产物结构和吸附性能的影响。结果表明,反应温度和压力对新生态MnO2的形貌和吸附性能有较大影响,常温常压下合成产物均为短棒状,水热合成产物为介孔纤维,对2,4-二硝基苯酚的吸附效果优于常温常压合成产物。新生态MnO2对2,4-二硝基苯酚的等温吸附和吸附动力学分别符合Langmuir等温式(R2>0.99)和准二级吸附动力学方程(R2>0.99),说明2,4-二硝基苯酚在新生态MnO2上为单分子层吸附和化学吸附。溶液pH值能显著影响2,4-二硝基苯酚在新生态MnO2上的吸附,在pH=7时最大吸附量为2.539 mg/g。 相似文献
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在pH值3.03的Britton-Robinson缓冲溶液中,曙红Y与硫酸庆大霉素相互作用而导致溶液吸收光谱发生了变化,用分光光度法对其进行了研究.曙红Y溶液在545 nm处有一强的特征吸收峰,当在其溶液中加入硫酸庆大霉素后,溶液发生褪色反应,545 nm处吸收峰强度降低,吸光度差值与硫酸庆大霉素浓度成正比.最佳条件下,硫酸庆大霉素的浓度在0~2.4 mg·L-1范围内遵守比尔定律,表观摩尔吸光系数ε=6.4×104L·mol-1·cm-1.将该方法应用于硫酸庆大霉素注射液的测定,结果令人满意. 相似文献
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《化学与生物工程》2017,(2)
合成了异鲁米诺衍生物N,N-二丙基异鲁米诺,对其结构和光谱性质进行了表征与研究。结果表明,pH=2~4时,N,N-二丙基异鲁米诺有较强的荧光,且随着pH值的增大荧光强度先增强后减弱,在pH=3时,荧光强度达到最强;pH=5~6时,荧光强度随着pH值的增大逐渐减弱;pH=7~12时,荧光强度基本稳定。在N,N-二丙基异鲁米诺的浓度为0~50μmol·L~(-1)时,荧光强度随浓度的增大而增强,线性拟合的标准曲线方程为y=4.5371+7.9074x,相关系数R2为0.9972。紫外吸收光谱表明,N,N-二丙基异鲁米诺在296nm处有很强的π→π*跃迁和苯环的重叠引起的B带吸收峰,在200~240nm处有羰基与苯环双键共轭引起的较弱的K带吸收峰。 相似文献
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壳聚糖固载环糊精微球的制备及吸附硝基酚 总被引:2,自引:1,他引:1
反相悬浮法制备甲醛保护壳聚糖(CTS)微球,环氧氯丙烷为交联剂β-环糊精反应制得壳聚糖固载环糊精微球。产物用红外光谱、扫描电子显微镜和X射线衍射仪进行表征,并用于吸附2,4-二硝基酚研究。考察了吸附时间、溶液pH值、酚浓度和NaCl含量对吸附的影响。实验结果表明,壳聚糖固载环糊精(CTS-CD)微球具有较好的耐酸碱性能,在pH值为3.6条件下,对2,4-二硝基酚的吸附快速达到平衡,吸附量为325mg/g,吸附符合Freundlich等温方程和二级动力学方程。 相似文献
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Tae Young Kim Seung Jai Kim Sung Young Cho 《Korean Journal of Chemical Engineering》2001,18(5):755-760
The adsorption characteristics of 2,4-dinitrophenol from water onto a granular activated carbon, F-400, were studied at pH
4.3, 7 and 10. Adsorption equilibria of 2,4-dinitrophenol on GAC could be represented by Sips equation. Equilibrium capacity
increased with decreasing pH. The differences in the rates of adsorption are primarily attributable to the differences in
the equilibrium at the various pHs. Intraparticle diffusion was explained by surface diffusion mechanism. An adsorption model
based on the linear driving force approximation (LDFA) was used for simulating the adsorption behavior of 2,4-dinitrophenol
in a fixed bed adsorber.
Presented at the Int’l Symp. on Chem. Eng. (Cheju, Feb. 8-10, 2001), dedicated to Prof. H. S. Chun on the occasion of his
retirement from Korea University. 相似文献
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Nor Azah Yusof Nor Dyana Zakaria Nor Amirah Mohd Maamor Abdul Halim Abdullah Md. Jelas Haron 《International journal of molecular sciences》2013,14(2):3993-4004
Molecularly imprinted polymers (MIPs) were prepared by bulk polymerization in acetonitrile using 2,4-dinitrophenol, acrylamide, ethylene glycol dimethacrylate, and benzoyl peroxide, as the template, functional monomer, cross-linker, and initiator, respectively. The MIP membrane was prepared by hybridization of MIP particles with cellulose acetate (CA) and polystyrene (PS) after being ground and sieved. The prepared MIP membrane was characterized using Fourier transform infrared spectroscopy and scanning electron microscopy. The parameters studied for the removal of 2,4-dinitrophenol included the effect of pH, sorption kinetics, and the selectivity of the MIP membrane. Maximum sorption of 2,4-nitrophenol by the fabricated CA membrane with MIP (CA-MIP) and the PS membrane with MIP (PS-MIP) was observed at pH 7.0 and pH 5.0, respectively. The sorption of 2,4-dinitrophenol by CA-MIP and PS-MIP followed a pseudo–second-order kinetic model. For a selectivity study, 2,4-dichlorophenol, 3-chlorophenol, and phenol were selected as potential interferences. The sorption capability of CA-MIP and PS-MIP towards 2,4-dinitrophenol was observed to be higher than that of 2,4-dichlorophenol, 3-chlorophenol, or phenol. 相似文献
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2%复硝酚钾水剂的高效液相色谱分析 总被引:1,自引:0,他引:1
文章建立了2%复硝酚钾水剂的高效液相色谱分析方法。使用ODS反相柱和可变波长检测器,以甲醇加水(水用0.1%H3PO4调至pH=3)为流动相,外标法对2,4-二硝基酚钾、对硝基酚钾和邻硝基酚钾进行定量分析。结果表明,方法的标准偏差为0.0114(邻硝基酚钾)、0.0158(对硝基酚钾)、0.0011(2,4-二硝基酚钾),变异系数为1.10%(邻硝基酚钾)、1.68%(对硝基酚钾)、0.0011%(2,4-二硝基酚钾),平均回收率为99.19%(邻硝基酚钾)、99.81%(对硝基酚钾)、99.31%(2,4-二硝基酚钾)。 相似文献
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粉末活性炭静态吸附水中硝基酚的试验研究 总被引:1,自引:0,他引:1
研究了常温(20℃)条件下粉末活性炭(PAC)对水中3-硝基酚、4-硝基酚、2,6-二硝基酚和2,4-二硝基酚4种硝基酚的静态吸附规律;并对照研究了未驯化的灭活活性污泥存在时,PAC对硝基酚的吸附性能。结果表明:PAC对4种硝基酚的吸附能力远大于灭活活性污泥;当硝基酚与PAC的质量比值在0.2~1.0时,PAC对4种硝基酚的吸附在60 min内可达到平衡,且均符合Langmiur吸附模型;用Langmiur吸附模型对试验数据进行拟合,得出了PAC对4种硝基酚的饱和吸附容量和吸附系数。 相似文献
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Herein, the Zr-MOF UiO-66-NH2 was synthesized in a facile method. When the as-synthesized UiO-66-NH2 is served as an adsorbent for 2,4,6-trinitrophenol (PA), styphnic acid (TNR), 2,4-dinitrophenol (2,4-DNP), 2,4,6-trinitrotoluene (TNT), and 2,4-dinitrotoluene (2,4-DNT) in water, the absorption capacities are 0.0225, 0.024, 0.0296, 0.0005, and 0.002 g/g, respectively. This suggests that UiO-66-NH2 is an excellent adsorbent for PA, TNR, and 2,4-DNP and is promising material for the removal of PA, TNR, and 2,4-DNP from wastewater. The excellent adsorption performance is attributed to the hydrogen-bond interactions between UiO-66-NH2 and these explosives. 相似文献