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This paper studies the adsorption of diethyl phthalate (DEP,an environmental hormone) on the surface of nanoscale TiO_2, effects of pH value of solutions, initial concentrations of DEP and additive surfactant on photocatalytic degradation and dynamics of DEP. Under ultra violet illumination, the interaction between DEP and surfactants including DBS (sodium dodecylbenzenesulfon-ate), CTAB (cetyltrimethylammonium bromide), and OP-10 (nonylphenol polyoxyethylene ether) was exploited from the perspective of degradation speed calculated by the data of high pressure liquid chromatography (HPLC) and UV-Vis spectra, respectively. Photocatalytic degradation of DEP followed pseudo first-order reaction kinetics. DEP as substrate degraded fast when its initial concentration was 130 mg/L. TiO_2 had certain adsorption ability of DEP. TiO_2 could adsorb the most DEP at the approximately neutral pH of 6.91. Degradation of DEP was not affected obviously by additives OP-10 and DBS. Degradation rate of DEP was not enhanced greatly in the presence of surfactants, but degradation of DBS was sped up. Degradation rate of DEP was depressed in the presence of additive CTAB. The more CTAB was added, the less DEP was degraded. Degradation rate of CTAB became slow with the increase of initial CTAB concentration. The possible adsorption models among TiO_2, DEP and surfactants were given. 相似文献
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《临沂师范学院学报》2019,(6):21-25
以邻苯二甲酸酐为原料,在浓硫酸催化剂作用下通过浓硝酸、硝酸盐引入硝基。实验研究了反应温度,各种硝酸盐对反应的影响。使用紫外光谱讨论了粗产品中4-硝基邻苯二甲酸的比率。在加入铜盐条件下,3-硝基邻苯二甲酸的产率提高11.4%。 相似文献
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邻苯二甲酸二(2-乙基己基)酯(DEHP)是一种致癌、致畸、致突变的环境激素类物质,在我国水体中普遍存在,且经常超标。采用气相色谱法,分别用μECD检测器、FID检测器对邻苯二甲酸二(2-乙基己基)酯定量测定比较,两中分析方法的标准曲线在0.186mg/L~3.72mg/L线性范围内相关系数r>0.9999,但μECD检测器气相色谱方法的检出量最低,可以达到0.19μg/L(生活饮用水国家标准是8μg/L)。用气质联用仪对南台水厂的DEHP指标进行了定性确认,说明南台水厂确实存在DEHP,其含量在监测期间没有超出国家标准。证明μECD检测器检测DEHP灵敏度高,结果准确、稳定。 相似文献
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利用Discover微波精确有机合成系统,以邻苯二甲酸酐、正己醇为原料,一水合硫酸氢钠为催化剂合成邻苯二甲酸二正己酯。考察了催化剂用量、微波辐射的功率和时间、反应物料配比对苯酐的转化率的影响。当n(正己醇):n(邻苯二甲酸酐)=2.4:1,微波辐射功率120W,辐射时间8min时,转化率达98.6%。 相似文献
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以苯酐和2-乙基己醇为原料,在自制的TiO_2/Al_2O_3复合型催化剂上合成邻苯二甲酸二异辛酯;确定了反应中催化剂的最佳配比及催化剂制备温度。考察了原料配比、催化剂用量、反应温度等工艺条件对酯化反应的影响。结果表明,该催化剂体系具有较好的催化活性,合成的DOP产品色相较好。 相似文献
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碳糊修饰电极测定抗坏血酸的研究及应用 总被引:1,自引:0,他引:1
在1.0 mool/L KCl的介质中,采用邻苯二甲酸二正辛酯修饰碳糊电极测定抗坏血酸(AA),抗坏血酸的浓度在9.1×10-6-3.4×10-3mol/L范围内与峰电流呈线性关系,相关系数r=0.9994,检测限5.7×10-6mol/L,并且探讨了电极过程的特性.测定了市售抗坏血酸片和橙汁中抗坏血酸的含量,结果满意. 相似文献