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1、第35卷第11期同济大学学报(自然科学版)Vol.35No.112007年11月JOURNALOFTONGJIUNIVERSITY(NATURALSCIENCE)Nov.2007钢渣吸附去除水溶液中磷的研究赵桂瑜,周琪,谢丽(同济大学污染控制与资源化国家重点实验室,上海200092)摘要:研究了钢渣对水溶液中磷素的等温吸附特征和吸附动力学过程,考察了初始溶液浓度、钢渣粒度和温度对吸附作用的影响,计算了钢渣对磷素的吸附速率.结果表明:钢渣的吸附除磷作用主要是通过化学沉淀和配位体交换4-1两种途径实现的,符合Lan
2、gmuir等温吸附模型,理论饱和吸附量为4.2710mgkg.钢渣对磷素的吸附量受粒度和温度影响不大,但随初始溶液浓度的增大而增大.钢渣粒度越小,吸附速率越高,对吸附作用越有利.温度较高,初始浓度较低的条件下,吸附速率较大.钢渣吸附除磷的吸附动力学过程符合准二级动力学模型,由该模型可以估算出钢渣对水溶液中磷素的平衡吸附量,误差基本在14%之内.关键词:钢渣;吸附;动力学中图分类号:X52文献标识码:A文章编号:0253-374X(2007)11-1510-05AdsorptionofPhos
3、phorusfromAqueousSolutiononSteelConverterSlagsZHAOGuiyu,ZHOUQi,XIELi(StateKeyLaboratoryofPolutionControlandResourceReuse,TongjiUniversity,Shanghai200092,China)Abstract:Thispaperfocusesonastudyofphosphorusadsorptionontosteelconverterslags.Phosphorusadsorptioniso
4、thermanditskineticswereexaminedandeffectsoftemperature,adsorbentparticlesizeandinitialphosphorusconcentrationwereinvestigatedtorevealreactionmechanisms.Phosphorusadsorptionratesofsteelconverterslagsunderdifferentconditionswerecalculatedforcomparison.Resultsshow
5、thatprecipitationreactionsandligandexchangewithelementsofcalciumandironinsteelconverterslagsarethedominatingmechanismsforphosphorusremoval.Langmuirisothermisfoundtofitthedataofphosphorusadsorptionontosteelconverterslagswell,withsaturationadsorptioncapacity4-1of4
6、.2710mgkg.Thecapacityofphosphorusadsorptionimproveswiththeincreaseofinitialphosphorusconcentrationbutisnotaffectedbytemperatureandadsorbentparticlesize.Phosphorusadsorptionrateisobservedtodecreasewithlargerparticlesize,butincreaseunderlowinitialphosphorusconc
7、entrationsandhighertemperature.Thechangeofphosphorusconcentrationwithtimecanbedescribedbythepseudosecondorderkineticswithcorrelationcoefficientof0.98.Accordingly,amountsofphosphorusadsorbedatequilibriumcanbecalculatedwitherrorbelow14%.Keywords:steelconvertersl
8、ags;adsorption;kinetics收稿日期:2006-03-13基金项目:上海市科委国际合作项目(062307038)作者简介:赵桂瑜(1976-),女,山西孝义人,博士生,Email:zgy1411@sina.com第11期赵桂瑜,等:钢渣吸附去除水溶液中磷的研究1511吸附除磷技术具有操作简单、处理成本
