微波促进Fe@MCM-48催化K2S2O8降解甲基橙废水

以正硅酸四乙酯(TEOS)为起始原料,硝酸铁为掺杂剂,十六烷基三甲基溴化铵(CTAB)为结构导向剂,经沉淀法成功制备了Fe掺杂MCM-48分子筛(Fe@MCM-48),并采用SEM、EDS、XRD、BET、FTIR对其进行了表征。研究了微波促进Fe@MCM-48催化K2S2O8降解甲基橙废水的行为,考察了溶液初始pH、微波功率、微波时间、Fe@MCM-48及K2S2O8用量等因素对废水脱色效果的影响。结果表明,微波-K2S2O8-Fe@MCM-48体系能高效快速降解废水中的甲基橙,在50 mL初始pH为7、质量浓度为500 mg/L的甲基橙废水中,微波辐射功率280 W、微波辐射10 min、Fe@MCM-48用量0.06 g、K2S2O8浓度为0.491 mmol/L的较佳处理工艺条件下,色度和及TOC去除率分别为97.6%和43.7%,微波、K2S2O8、Fe@MCM-48体系对甲基橙废水降解效果明显,产生了协同效应。

Degradation of methyl orange wastewater by microwave assisted catalysis of potassium persulfate with Fe@MCM-48

Iron incorporated into MCM-48 molecular sieve (Fe@MCM-48) was successfully synthesized by precipitation method using cetyltrimethylammonium bromide (CTAB) as a structural directing agent,and tetraethylorthosilicate (TEOS) as starting raw materials and ferric nitrate as dopant.And then the samples were characterized by scanning electron microscopy (SEM),energy disperse spectrum (EDS),X-ray diffraction (XRD) patterns,N2 adsorption/desorption measurements(BET) and Fourier transform infrared spectroscopy (FTIR).Catalytic degradation performance of methyl orange (MO) solution in microwave-assisted Fe@MCM-48/K2S2O8 system was studied.The effects of different factors including solution initial pH value,microwave power,radiated time,dose of Fe@MCM-48 and potassium persulfate on the degradation of MO were studied.The results showed that the MO was degraded rapidly and efficiently.For 50 mL solution with initial pH of 7 and MO concentration of 500 mg/L,97.6% of color and 43.7% of TOC were removed,under the better reaction conditions of the microwave radiation power input of 280 W,the microwave radiation time of 10 min,Fe@MCM-48 mass of 0.06 g and K2S2O8concentration of 0.491 mmol/L.Degradation process of MO wastewater by microwave,potassium persulfate and Fe@MCM-48 have excellent results and synergetic effect.