Permethrin is one of the most important synthetic pyrethroids at the present time. Since it is highly effective, with low toxicity, and leaves almost no residue, it has obvious advantages over many other commonly used...Permethrin is one of the most important synthetic pyrethroids at the present time. Since it is highly effective, with low toxicity, and leaves almost no residue, it has obvious advantages over many other commonly used pesticides. The title Compound Ⅸ is an important intermediate in the synthesis of展开更多
The photocatalyst consisted of titanium dioxide loaded on natural zeolite was prepared by impregnation of tetrabutyl titanate acidic solution followed by calcination. The photocatalytic activity of the catalyst toward...The photocatalyst consisted of titanium dioxide loaded on natural zeolite was prepared by impregnation of tetrabutyl titanate acidic solution followed by calcination. The photocatalytic activity of the catalyst towards dichlorvos has been examined as function of TiO 2 amount, calcination temperature of precursor, pH of sample solution and added amount of H 2O 2. The results indicated that the catalyst prepared by calcination at 200 ℃ showed the highest activity and 89% of Dichlorvos in concentration of 1.0×10 -4 mol/L could be degraded over the catalyst under sunlight illumination for 6 hours.展开更多
采用微波技术对二氯菊酸甲酯在NaOH溶液中水解为二氯菊酸工艺进行了研究。结果表明,微波促进下最佳水解条件为:反应温度90℃,功率100 W,反应时间10 m in,物质的量比n(二氯菊酸甲酯)∶n(C2H5OH)∶n(NaOH)=1∶4∶1.5,重结晶后收率高达99.6...采用微波技术对二氯菊酸甲酯在NaOH溶液中水解为二氯菊酸工艺进行了研究。结果表明,微波促进下最佳水解条件为:反应温度90℃,功率100 W,反应时间10 m in,物质的量比n(二氯菊酸甲酯)∶n(C2H5OH)∶n(NaOH)=1∶4∶1.5,重结晶后收率高达99.6%。与传统条件相比,时间缩短30倍,收率提高24.6%,无水乙醇用量减少60%,NaOH用量减少17%。并用红外光谱和熔点对二氯菊酸进行表征。展开更多
文摘Permethrin is one of the most important synthetic pyrethroids at the present time. Since it is highly effective, with low toxicity, and leaves almost no residue, it has obvious advantages over many other commonly used pesticides. The title Compound Ⅸ is an important intermediate in the synthesis of
文摘The photocatalyst consisted of titanium dioxide loaded on natural zeolite was prepared by impregnation of tetrabutyl titanate acidic solution followed by calcination. The photocatalytic activity of the catalyst towards dichlorvos has been examined as function of TiO 2 amount, calcination temperature of precursor, pH of sample solution and added amount of H 2O 2. The results indicated that the catalyst prepared by calcination at 200 ℃ showed the highest activity and 89% of Dichlorvos in concentration of 1.0×10 -4 mol/L could be degraded over the catalyst under sunlight illumination for 6 hours.
文摘采用微波技术对二氯菊酸甲酯在NaOH溶液中水解为二氯菊酸工艺进行了研究。结果表明,微波促进下最佳水解条件为:反应温度90℃,功率100 W,反应时间10 m in,物质的量比n(二氯菊酸甲酯)∶n(C2H5OH)∶n(NaOH)=1∶4∶1.5,重结晶后收率高达99.6%。与传统条件相比,时间缩短30倍,收率提高24.6%,无水乙醇用量减少60%,NaOH用量减少17%。并用红外光谱和熔点对二氯菊酸进行表征。
