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北京化工大学硕士学位论文196.1 mg·g‘1303 K和185.2 mg·91308 K,远高于AC.Fe和AC.A1对头孢他啶的吸附量。头孢他啶在吸附过程中主要受颗粒内扩散和液膜扩散两个过程控制。通过吸附等温线及热力学分析,发现吸附过程均为自发的、放热的,且可较好符合Freundlich和Tempkin等温方程。关键词活性炭,改性,PPCPs,头孢类抗生素,吸附摘要ADSORPTION OF CEPHALOSPORINS ONMODIFIED ACTⅣATED CARBONABSTRACTIn recent decades,the antibiotic pollution problem has attractted moreand moreattention.Especially in drinkingwater some antibiotic has beendetected.The presence of antibiotic has caused great threaten to mankind andecological environment.Thus,the research of how to remove the type of waterpollutants is imperative.In this paper,different modification s were selected.Theadsorption capacity of different modified activated carbon were compared.Three kind of modified activated carbon ACCu,AC城and AC-Fe were usedin the subsequent experiments.The structures and properties of three kind of modified activated carbonhave been analyzed first.The results showed that after modification,thesurface of the activated carbons were more rough.The specific surface area ofAC.Cu was reduced less.In addition,the content of CC and benzenefunctional grou_【 “reased.The pecific surface area 4 AC.F wasfUnctionalgrouos were lnc e 1 lae speclIlC ace area oI e. A乙-上.similar as AC-Cu.And the content of benzene and carboxylic oxygencontaining functional groups were reduced.The specific surface area of ACA1reduced a lot.The oxygencontaining functional groups such as carboxyl and北京化工大学硕士学位论文hydroxyl groups were increased in AC-A1.In addition,there werecorresponding metal element in three kinds of activated carbon.The effect of different conditions on the adsorption of ceflazidime bythree kinds of activated carbon were studied.The results showed that as theincreasing of ionic strength,the adsorption capacity of ceftazidime increased alittle.But with the increasing of pH value,the adsorption capacity ofceflazidime decreased sharply.Low temperature Was more conducive for theadsorption.The presence of natural organic matterhumic acidhad littleinfluence on the adsorption of ceflazidime.The adsorption of ceflazidime on three kinds of activated carbon obey thepseudosecond order kinetic model.The maximum adsorption quantity ofceflazidime calculated by pseudo-second order kinetic model were 200.0mg·91298 K,196.1 mg·g’1303 Kand 185.2 mg·91308 K.It Was muchhigher than that of AC-Fe and AC-A1.The uptake of ceflazidime Was mainlycontrolled by liquid film mass transfer and intraparticular mass transfer.According to the adsorption isotherm and thermodynamics analysis,theadsorption process Was spontaneous and exothermic process,and Can bettermeet the Freundlich and Tempkin isothermal equation.KEY WORDS activated carbon, modified,PPCPs, cephalosporinantibiotics,adsorptionV目录目录第一章绪论11.1前言.11.2 PPCPs的危害及研究现状..11.2.1 PPCPs的来源及污染现状21.2.2 PPCPs的危害31.2.3 PPCPs的去除41.3活性炭的研究现状.81.3.1活性炭的吸附机理一81.3.2活性炭的改性方法一91.4研究的意义与内容131.4.1研究的意义131.4.2研究的内容14第二章实验材料与方法.1 52.1引言152.2实验试剂与仪器152.3活性炭改性172.3.1酸碱改性172.3.2氧化改性172.3.3负载金属改性172.4活性炭的表征182.4.1活性炭的表面形态182.4.2比表面积与孔体积的测定182.4.3表面官能团的测定182.4.4表面元素的测定182.5头孢他啶的吸附192.5.1吸附实验192.5.2吸附动力学192.5.3吸附等温线192.5.4头孢他啶浓度测定方法20V北京化工大学硕士学位论文第三章活性炭的改性与表征2 13.1活性炭的改性3.2活性炭的表征3.2.1表面形态分析3.2.2比表面积与孑L径分析3.2.3傅里叶红外光谱分析3.2.4表面元素分析3.3本章小结第四章活性炭对头孢他啶的吸附研究294.1引言294.2活性炭吸附头孢他啶影响因素分析294.2.1平衡时间的确定294.2.2离子强度对吸附效果的影响304.2.3溶液初始pH对吸附效果的影响.3 14.2.4温度和初始浓度对吸附效果的影响334.2.5天然有机物对吸附效果的影响354.3改性活性炭对水中头孢他啶吸附性能的研究374.3.1吸附动力学分析374.3.2吸附等温线464.3.3吸附热力学o一494.4本章小结5l第五章不同头孢类抗生素在活性炭上的吸附535.1引言535.2不同头孢类抗生素的吸附效果比较535.2.1实验方法535.2.2实验结果与讨论535.3吸附动力学及QSPR模型分析585.3.1吸附动力学585.3.2 QSPR模型分析一615.4本章小结63VI12235672222222●●●●●●●●●●●●●●●●●●●●●目录第六章结论与展望.656.1结论.656.2展望66参考文献67致 谢73研究成果及发表的学术论文75作者简介77北京化工大学硕士学位论文目录ContentsChapter I Introduction....11.1 Foreword.....11.2 Hazard and research status ofPPCPs.......11.2.1 Sources and pollution status ofPPCPs一21.2.2 Hazards ofPPCPs.31.2.3 Removal ofPPCPs.....41.3 Research Status ofactivated carbon.....................81.3.1 Adsorption mechanism ofactivated carbon..81.3.2 Modified ofactivated carbon91.4 The purpose and aspect ofthe research....................................................................131.4.1 The purpose ofthe research..131.4.2 The aspect ofthe research.........................14Chapter 2 Materials and s1 52.1 Foreword152.2 Experiment materials and equipment..152.3 Modification ofactivated carbon...172.3.1 Acid and base modification..172.3.2 Oxidative modification172.3.3 Load metal modification172.4 Characterization ofactivated carbon182.4.1 The surface morphology ofactivated carbon.182.4.2 Determination ofBET and pore volume182.4.3 Determination ofsurface functional groups................................................................182.4.4 Determination of surface elements..............................................................................182.5 Adsorption ofceftazidime.192.5.1 Adsorption experiments192.5.2 Adsorption kinetics192.5.3 Adsorption isotherm192.5.4 Measurement ofcettazidime concentration20I一一. 塞些三奎兰堡主兰篁笙茎 。_●-__-_一一Chapter 3 Modification and characterization of activated carbon··213.1 Modification ofactivated carbon..............................................·······.··213.2 Characterization ofactivated carbon223.2.1 The surface morphology analysis..................................................223.2.2 The specific surface area and pore size analysis..........................................233.2.3 Fourier trans infrared spectroscopy analysis.......253.2.4 Surface elemental analysis............................................................263.3 Chapter summary.................................................................27Chapter 4 Adsorption of ceftazidime on activated carbon·294.1 Foreword.........294.2 Influence Factors......294.2.1 Determination ofequilibrium time......................................................294.2.2 Effect ofionic strength..................................................................304.2.3 Effect ofpH.....................................................................................................314.2.4 Effect oftemperature and initial concentratmn..jj.· 一 一 4.2.5 Effect ofNOM....................................................................................................354.3 Study on properties ofadsorption............................................................................374.3.1 Adsorption kinetics analysis.......................................................374.3.2 Adsorption isotherm.464.3.3 Adsorption Thermodynamics.....................................................494.4 Chapter summary........51Chapter 5 Adsorption of different Cephalosporins on activated carbon.535.1 Foreword.........535.2 Comparison between different cephalosporins adsorption..............................535.2.1 Experimental s...........................................................................535.2.2 Results and discussion..................................................................................535.3 Adsorption kinetics and QSPR model.....................................................,..........。........585.3.1 Adsorption kinetics.......................................................................................585.3.2 QSPR model............................................................................615.4 Chapter summary..63X目录Chapter 6 Conclusion and recommendations.656.1 The conclusions...............................................................................................656.2 The recommendations..................................................................................66Reference.67Acknowledgement73rn’ ’· 一1he results and papers..75The introduction of author..77
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