简介：ＭＣＭ选手谈收获李尚志数学模型竞赛，简称ＭＣＭ（ＭａｔｈｅｍａｔｉｃａｌＣｏｎｔｅｓｔｏｆＭｏｄｅｌｉｎｇ的缩写），是应用数学知识以及计算机等技术手段解决实际问题的一项竞赛．我国大学生从１９８９年开始参加美国的ＭＣＭ竞赛．１９９２年开始由我国自己组织...

简介：在碱性条件下,以十六烷基三甲基溴化（CTAB）和正硅酸乙酯（TEOS）为主要原料,采用水热合成法制备出MCM-41分子筛.通过物理浸渍法对MCM-41分子筛进行表面功能化,制备出2-羰基丙酸邻羟基苯甲酰腙修饰MCM-41孔分子筛.研究了修饰分子筛对尾矿废水中镉离子的吸附性能,考察了吸附时间、pH值、温度、分子筛用量等因素对功能化分子筛吸附性能的影响.结果表明：2-羰基丙酸邻羟基苯甲酰腙修饰MCM-41分子筛在吸附时间为30min,pH为8.02,温度为40℃,吸附剂用量为0.08g的条件下吸附性能最佳,最大去除率为95.6%.

简介：ActiveFe-andMn-loadedMCM-41(Fe–Mn/MCM-41),whichwassynthesizedviaahydrothermalreactionfollowedbyimpregnation,isusedintheheterogeneousFentonreactiontodegrademethylorange(MO)inaqueoussolution.ThesynthesizedsampleswerecharacterizedbyX-raydiffraction,scanningelectronmicroscopy,transmissionelectronmicroscopy,N2adsorption–desorptionisothermanalysis,Fouriertransforminfraredspectroscopy,andX-rayphotoelectronspectroscopy.ComparedwithFe/MCM-41andMn/MCM-41,Fe–Mn/MCM-41showedhigheractivityforMOdegradationandmineralization.Effectsofvariousoperatingparameters,suchaspH,Mncontent,andH2O2dosage,onthedegradationprocessweresubsequentlyinvestigated.ResultsofexperimentsontheeffectofradicalscavengersrevealedthatthedegradationofMOcouldbeattributedtooxidationbyHO·.ThesynergyofFeandMnspeciesintheFentonoxidationprocesswasalsoexplained.