纳米fe-ni论文：纳米fe-ni双金属颗粒的制备优化及其去除水中cahs的基础研究

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1、纳米Fe/Ni论文：纳米Fe/Ni双金属颗粒的制备优化及其去除水中CAHs的基础研究【中文摘要】氯代脂肪烃(ChlorinatedAliphaticHydrocarbons-CAHs)作为化工原料和有机溶剂被广泛的应用于化工、制革、医药和电子等行业,使用过程中发生的泄漏、喷射以及工业的直接排放,引起土壤和地下水的CAHs污染。本文旨在研究纳米零价铁和镍组成的双金属体系对CAHs的【英文摘要】Chlorinatedaliphatichydrocarbons(CAHs)aschemicalrawmaterialsandorganicsolvents,arewidelyusedi

2、nchemical,leather,pharmaceuticalandelectronicsindustries.Asaresultoftheleakageorinjetionoccurintheprocessandindustrialdirectemissions,CAHsresultsinthecriticalcontaminationofsoilandgroundwaterenvironments.TheobjectiveofthisstudyistoevaluatetheeffectivenessofremovingCAHsfromgroundwaterwithna

3、no-scaleFe/Ni(iron/nickel)particles.Liquidphasechemicalreductioncoprecipitationmethod,chosen42%polyethyleneglycolasdispersingagentandfreezedryingasthedringtechnique,wasemployedforthepreparationofnano-Fe/Nibimetallicmaterials.TheFe/Niparticles,withaveragesizeof20nm,haveamorphousnano-alloyst

4、ructure.TheresultsofbatchCAHsdegradationexperimentsbynanoFe/NiwithdifferentNicontentshownthat,for1,1,1-TCAandPCE,theoptimumNicontentis11%,whilenanoFe/Niwith6%NicontenthasthebestremovalcapacityforTCE.ThisphenomenonimpliesthatthehighercontentofNimetalcatalystdoesn’tmeanthebetterperformancefo

5、rCAHsremoval.Asthedosageincreases,thenano-Fe/NiparticleswillreduceTCEmorequicklywithhigherremovalrate.When1,1,1-TCAandTCEco-existinthewater,slowerreductionwasobservedwithlowerremovalrateforeachCAH.Ca2+,Mg+,Na+,SO42-,NO3-,Cl-,andmethanolwerefoundhavenegativeeffectson1,1,1-TCAandTCEdegradati

6、on,whiletheeffectofhumicacidsodiumisconstitutedofcompetitiveadsorptionandtransmissionofelectron.TheCAHsremovalkineticsbynanoFe/Niconsistswiththepseudo-firstorderkineticsmodel.【关键词】纳米Fe/Ni降解CAHs地下水修复【英文关键词】nano-Fe/NidegradationCAHsgroundwaterremediation【目录】纳米Fe/Ni双金属颗粒的制备优化及其去除水中CAHs的基础研究摘要

7、5-6Abstract6第1章前言10-121.1课题背景10-111.1.1我国地下水污染现状10-111.2研究意义与目的11-12第2章文献综述12-232.1地下水中CAHs的来源及污染现状12-132.1.1地下水中CAHs的来源122.1.2地下水中CAHs的污染现状12-132.2地下水中CAHs的性质和危害13-152.2.1CAHs的主要性质13-142.2.2地下水中CAHs的危害14-152.3地下水中CAHs的处理方法及其特点15-182.3.1物理法控制CAHs污染及其特点15-162.3