中文摘要：

为了探明环丙沙星在潮土中的吸附特性,采用静态吸附试验,研究了环丙沙星在潮土中的吸附动力学、等温吸附特性以及pH值对其吸附过程的影响.结果表明,环丙沙星在潮土中的吸附过程可分为快速吸附和慢速平衡2个阶段.整个吸附过程符合二级反应动力学方程,吸附常数为1.138×10-3～2.849×10-2kg.（min.mg）-1.环丙沙星的吸附等温线能够较好地符合Freundlich方程和Langmuir方程,其中Freundlich方程的拟合效果更佳,吸附容量（lgKf）为2.725.研究发现,在pH值为4～9条件下,环丙沙星的吸附参数对数值lgKd呈随pH的增加先增加后降低的趋势,当pH值为5时,潮土对环丙沙星的吸附效果最好,lgKd为3.11,强酸性和碱性条件均不利于潮土对环丙沙星的吸附.由此推断阳离子吸附可能是潮土对环丙沙星吸附的重要机制之一.

英文摘要：

The kinetic mechanism of NOx reduction with hydrazine hydrate in selective non-catalytic reduction（SNCR） process was studied and verified by the experimental results,the dominant radicals and reactions were confirmed through sensitivity analysis and key parameters in SNCR process have been obtained.The results of numerical simulation based on the proposed mechanism showed that the effective temperatures for SNCR de-NOx process were bimodal distribution with the optimum temperatures being 650℃ and 975℃ respectively and the lower temperature window fell in the range of 597-747℃;while the experimental results proved the bimodal distribution of effective temperature with peak values being 653℃ and 968℃ respectively and the lower temperature window was within the range of 587-707℃ for hydrazine-based SNCR process.Simulation results and experimental results matched well with respect to reaction behaviors versus temperature.Through sensitivity analysis it had been found that the most effective reaction to reduce NO was the decomposition reaction of N2H4 to NH2 and the most helpful radical was NH2.Compared to ammonia the temperature window of hydrazine-based SNCR process on the lower temperature side is more flexible for application.Decreased O2 concentration would move the temperature window to the right side,which was contrary to that of ammonia;while increased n（N2H4）/n（NO） moved the temperature window to the left side and NOx reduction efficiency was also improved.All of these results showed that hydrazine has lower temperature window than those traditional de-NOx reagents and it will be widely used in application of SNCR as a potential reductant for NOx reduction.