Microwave induced degradation treatment of methyl orange simulated wastewater with expended graphite (EG ) and potassium persulfate is investigated in this paper .The effects of different factors including solution initial pH value ,dose of EG and potassium persulfate ,microwave power and radiated time on the degradation of MO are studied respectively and then the catalysts fresh and after six cycles are characterized by SEM ,EDS ,XRD and FTIR .The results show that the MO can be degraded rapidly and efficiently .For 50 mL solution with initial pH of 1 and MO concentration of 200 mg/L ,the decol-oration rate of the MO is up to 98 .6% ,under the better reaction conditions of EG mass of 0 .1 g ,K2 S2 O8 dosage of 0 .05 g , the microwave radiation power of 259 W and the microwave radiation time of 6 mins .Degradation of MO wastewater using mi-crowave induced EG and potassium persulfate is excellent and synergetic effect can be achieved .In addition ,EG also has good reusable performance and MO decolorization rate remains at 90 .8% after 6 cycles .%研究了微波诱导膨胀石墨－K2S2O8催化氧化降解甲基橙模拟废水工艺，分别考察了溶液初始pH值、EG及K2 S2 O8用量、微波功率、微波时间等因素对废水脱色效果的影响，采用SEM、EDS、XRD、FTIR对新鲜及使用6次后的EG进行了表征。结果表明，微波诱导EG－K2S2O8体系能高效快速地降解废水中的甲基橙，在50 mL初始pH值为1、质量浓度为200 mg／L的甲基橙废水中，EG用量0．1 g、K2 S2 O8为0．05 g、微波辐射功率259 W、微波辐射6 min的处理工艺条件下，脱色率达到了98．6％，微波诱导EG－K2 S2 O8体系对甲基橙废水降解效果明显，产生了协同效应。此外，膨胀石墨还具有良好的重复使用性能，使用6次后甲基橙脱色率仍然保持在90．8％。
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