【作者】 刘晓蕾；

【导师】 孙冰； 严志宇；

【作者基本信息】 大连海事大学 ， 环境科学与工程， 2012， 硕士

【摘要】 活性炭具有较大的比表面积和丰富的孔隙结构,对偶氮染料可以进行有效的吸附。微波不仅能够有效的再生活性炭,还能够进行催化氧化,有利于污染物的降解。本文选择甲基橙作为模拟偶氮污染物,对活性炭吸附和微波再生解析的特性进行了研究。对活性炭的质量、吸附时间、溶液pH值、再生功率、微波辐照时间、再生气氛等影响活性炭吸附和再生的因素进行了考察；对活性炭再生前后的孔隙结构进行分析；对甲基橙的降解效果进行了研究,考察是否存在二次污染；进行了流动模拟实验。实验结果表明：(1)活性炭吸附10 mg/L甲基橙模拟废水的最佳工艺条件为活性炭用量2g/mL,吸附时间为45 min,pH值对吸附效果没有明显的影响。(2)微波再生活性炭的最佳工艺条件为微波功率700 W,微波辐照时间60 S；02和N2的通入对再生效果几乎没有影响；进行10次再生循环实验后,活性炭吸附效果下降；再生后活性炭的微孔结构为破坏,再生的孔隙多为大孔,不利于活性炭的吸附。(3)微波再生活性炭时,通过紫外-可见分光光度计和液相色谱对降解蒸汽进行分析,发现甲基橙原有的偶氮和苯环结构被破坏；降解产物中含有一定量的硝酸根离子；证实微波再生活性炭的同时可以有效的降解甲基橙,避免二次污染。(4)采用流动活性炭吸附工艺比搅拌工艺具有更好的实用效果,采用0.1g/mL的活性炭吸附10h,可以达到较理想的吸附效果,循环再生5次后,对甲基橙的去除率仍高于50%。本实验先利用活性炭吸附富集甲基橙,再利用微波对载甲基橙的活性炭进行集中再生,可以达到节能目的；并且微波再生可以有效降解污染物,避免二次污染。这对工业实际应用具有一定的参考价值。更多还原

【Abstract】 Activated carbon has large specific surface area and pore structure,so it can adsorb the azo dyes effectively. Microwave not only can regenerate the activated carbon,but also has catalytic oxidation effection to the degradation of pollutants. In this paper,the characteristics of the absorbtion of activated carbon and regeneration of activated carbon with the microwave have been researched.Methyl orange(MO) has been selected as a simulate wastewater.The influence factors of the adsorption and regeneration processes have been investigated,including the quality of activated carbon, adsorption time, pH value,renewable power, microwave irradiation time and the regenerative atmosphere.Analyze the pore structure of The original carbon and regenerated carbon.Research the degradation of methyl orange and the existence of secondary contamination. The results showed that:(l)Under the optimal conditions applied of 10 mg/L MO solution,20 g/mL activated carbon dose,45 min,the effective adsorption was obtained. The pH had no significant influence of the adsorption effect.(2) The optimum conditions for microwave regeneration of cost activated carbon were microwave power 700 W and microwave irradiation time of 60 s.O2 and N2 led to almost no effect. The adsorption capacity of GAC for MO removal did some decrease after the 10 cycles of adsorption/regeneration. The porous structure of activated carbon after regeneration had been destroyed.Most of the pore sizes after regeneration were macropores.It was not conducive to the adsorption of activated carbon.(3) Analysis the degradation steam using the UV-visible spectrophotometer and liquid chromatography during the microwave regeneration process. It found that the azo and the benzene ring structure of the original methyl orange was destroyed. The degradation products contained a certain amount of nitric acid ions. It could confirm that microwave could regenerate the activated carbon and decomposed the MO to avoid secondary pollution effectively.(4)The flow activated carbon adsorption process had better practical effect than the mixing process.Using the activated carbon of 0.1 g/mL to adsorpt for 10 hours could achieve better adsorption effect. After five times absorbtion/regeneration recycles, the removal rate of MO was still higher than 50%.In this study, methyl orange had been adsorpted using of activated carbon to achieve the enrichment effect firstly.Then regenerated the activated carbon containing methyl orange with the microwave concentratedly. These could save energy.The microwave regeneration could effectively degrade contaminants,and avoid secondary pollution. It provides a certain reference value for industrial applications.更多还原