硅藻土的锰氧化物改性及其对Zn2的吸附行为研究

硅藻土的锰氧化物改性及其对舻的吸附行为研究土对zn2+的吸附效果已能达到比较较好的效果，随着pH值上升，改性硅藻土对Zr的吸附能力逐渐增强，但当pH>6，pH值对改性硅藻土吸附能力的影响逐渐变小。改性硅藻土对zn”的吸附速率很快，可以认为，30分钟基本上可以达到吸附平衡。4、在相同的PH值下，改性硅藻土对zn”离子的吸附能力都比改性前强，尤其是在pH<7的酸性至弱酸性条件下，改性硅藻土对zn”离子的吸附能力要远优于酸洗土；在相同的实验条件下，包括改性硅藻土用量、溶液初始浓度、pH值和吸附时间，改性硅藻土对溶液中Pb”的去除能力要明显优于对zn“。5、改性硅藻土对Zn'+离子的等温吸附基本上符合Langmuir的单分子层吸附模式，能较好的用Langmuir吸附等温式拟合，改性硅藻土对zn2+离子的最大吸附量为15．04mg／g；而改性硅藻土对Pb2+离子的等温吸附可以很好的用Freundlich吸附等温式描述，随着平衡浓度的提高，Pb”的负载量并不趋向于一定值。两者在等温吸附上的区别可能是由于改性硅藻土对zn”和Pb2+的吸附机理存在一定的差异。关键词：硅藻土；锰氧化物；吸附；Z一2中山大学硕士学位论文StudyofMangeneseOxidesModifiedDiatomiteandItsAdsorptionBehaviorforZn2+Major：Mineralogy,Petrology,MincmlDepositGeologyName：SuYuweiSupervisedbyAssociateProfessorYangZhijun,ProfessorZJaouYongzhangSincethefirstdiscoveryofdiatomiteinGermanin1833，researchershavecarriedthroughplentifuleffectivestudiestothem．Thestudiesindicatethatdiatomitehasmanyuniquephysicalandchemicalproperties,suchaslowdensity,lowdgidity,highlyporousStlllCtare,largesurfacearea,andstrongadsorptivecapability．Baseonthesephysicalandchemicalproperties,pcoplehavedevelopedover500kindsofdiatomaceonsmanufactures,whicharewidelyusedinindustrialproduction．Althoughdiatomitehasbeenwidclyusedinindustries,researchersconsiderthattheevolutivedirectionofinvestigationtodiatomitearestillenlargingitsusagesanddeveiopinghighlytechnicalandcommercioganicproducts．Atthesametime，therearestillconsiderabledivaricationsinthestudyofadsorptivecapab珏ilyandmechanismofdiatomiteanditsmodifiedproducts．Andtherearemanyfacetstobeimproved．Therefore,itisavaluableinvestigationinacademeandapplicationtoseekafterthecapabilityofinorganicmodifieddiatomiteanditsrenovationofaqueousheavymemalpollution．Thesurfjlccofmanganeseoxideshasobviouschemicaladsorptioncapability,withhighadsorptioncapacityforheavymemMions,whichhasvisiblesignificanceinthemigratoryprocessofheavymentalpollution．Hence,thispaperwillmodifydiatomitewithmanganeseoxides，andresearchthemodifiedproductsbymeansofSEM,XRD，andFHRetal,inordertostudytheirsurfac：eappearance，microstructure,andmineralcompos