硫酸改性麻黄废渣对Cu2＋的吸附研究.pdf

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1、环境污染与防治第36卷第8期2014年8月硫酸改性麻黄废渣对Cu2+的吸附研究*时洋马春芳朱彦姝。冯宁川(1．宁夏医科大学药学院，宁夏银川750004；2．宁夏医科大学基础医学院，宁夏银川750004)摘要用硫酸对麻黄废渣进行化学改性，制备改性麻黄废渣，并用于模拟废水中Cuz的吸附。通过扫描电子显微镜、傅里叶红外光谱仪和官能团滴定等方法对改性麻黄废渣进行表征；采用静态吸附实验，考察了溶液pH、吸附剂用量、吸附时间等对吸附效果的影响。结果表明，麻黄废渣改性后，酸性基团数量明显增加，羟基和羧基也均有大幅度的增加，表面比改性前变得粗糙和疏松多L，表面积

2、增大。更有利于对Cu抖的吸附。室温(25℃)下改性麻黄废渣吸附Cu抖的较佳条件为：溶液pH5．0、吸附时间60min、改性麻黄废渣用量4g／L。改性麻黄废渣对Cuz+的吸附可以用准二级动力学方程描述，Cu0。。的饱和吸附量为2．20mmol／g，与改性前(1．49mmol／g)相比有明显提高。改性麻黄废渣吸附一解吸附循环使用5次中，cu抖的平均解吸率达到83左右，麻黄废渣平均再生率达到94以上，经5次循环使用，Cuz吸附率仍可达到99．46，说明改性麻黄废渣具有良好的重复利用性能。关键词麻黄废渣化学改性Cu吸附Studyontheadsorpti

3、onofCu2bychemicallymodifiedephedrawasteSHIYang，MAChunfang，ZHUYanshu。，FENGNingchuan。．(1．SchoolofPharmacy，NingxiaMedicalUniversity，YinchuanNingxia750004；2．SchoolofBasicMedicalScience，NingxiaMedicalUniversity，YinchuanNingxia750004)Abstract：Theephedrawastewaschemicallymodifiedbys

4、ulfuricacidtoadsorbCu。ionsfromsimulatedwastewater．TheobtainedmodifiedephedrawastewascharacterizedbyScanningelectronmicroscope(SEM)，Fourierinfraredspectrometer(FTIR)andfunctionalgrouptitrationmethod．ThestaticadsorptionexperimentswerecarriedouttOinvestigatetheeffectofsolutionpH

5、．adsorbentdosageandcontacttimeonCuremovalefficiency．Resultsshowedthatthenumberofacidicgroupincreasedobviously，SOasthecarboxylandhydroxylgroups．Thesurfaceofmodifiedephedrawastewascoarse，poriferousandoflaxstructure，thesuperficialareawasgreatlyincreased，whichwasbenefitedfortheCu

6、adsorption．TheoptimumconditionsforCuadsorptiononmodifiedephedrawasteatroomtemperatureweresolutionpHof5．0，contacttimeof60min，adsorbentdosageof4g／L．TheCuadsorptiononmodifiedephedrawastecouldbewellfittedbypseudo—secondorderkineticsequation．ThemaximumCuadsorptioncapacityofmodifie

7、dadsorbentwas2．20mmol／g，morethanthatofunmodifiedadsorbent(1．49mmol／g)．Duringthe5cyclesofadsorption-desorptionprocess，theaverageCudesorptionratewas83，theaverageregenerationratewasabove94，CuofrecycledadsorbentcouldreachtO99．46，indicatingtheperfectrecycleperformanceofrood—ifiede

8、phedrawaste．Keywords：ephedrawaste；chemicallymodification；Cu；adsorpti