改性花生壳吸附废水中zn2的研究

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1、改性花生壳吸附废水中Zn2+的研究胡文云徐汉江武汉轻工大学化学与环境工程学院摘要：笔者利用甲醛一硫酸（甲醛与硫酸体积比为1:5）混合液对花生壳进行改性，并以此为吸附剂用于吸附废水中的Zn2+。用BT-90粒度仪对花生壳粒径进行了测试，且对花生壳进行丫电子显微镜扫描。考察了花生壳用量、吸附时间、初始浓度、反应温度及pH值对吸附效果的影响。结果表明，花生壳粒径在3971-5000nm之间，平均粒径di为4366nm，通过计算得其比表面积为1.374X106m2/m3;改性花生壳和未改性花生壳表面特征有明显差别，改性花

2、生壳表面有更多活性吸附点，其对Zn2+的吸附效果优于未改性的花生壳。当吸附剂的用量为1.0g/L时，改性花生壳和未改性花生壳对Zn2+的去除率均达到最大值,分别为64.7%和63.7%;当Zn2+初始浓度为10mg/L时，两种吸附剂对Zn2+的去除率均较高，分别为57.9%和56.3%;当pH=7时，花生壳对Zn2+去除率达到最大,为68.4%;当温度为301，花生壳对Z#去除率达到最大，为65.2%。用Langmuir和Freundlich等温吸附模型对实验数据进行线性拟合，表明花生壳对Zn2+的吸附较好地符合

3、Freundlich等温方程，吸附过程AH为负值说明该吸附为放热过程，AG为负值说明该吸附是自发进行的。关键词：花生壳;甲醛一硫酸;锌离了、吸附;吸附等温线。；作者简介：胡文云（1970-），女，副教授，E-mail:295003728@qq.com.收稿曰期:2017-09-18StudiesontheadsorptionofZn2+inwastewaterbymodifiedpeanutshellHUWen-yunXUHan-jiangSchoolofChemicalandEnvironmentalEngin

4、eering，WuhanPolytechnicUniversity:Abstract：Themodifiedpeanutshellbymixedformaldehyde-sulfuricacid(1:5V/V)solutionwasinvestigatedasadsorbenttoadsorbZn2’inwastewater.ThepeanutshellparticlesizewastestedbytheBT-90particlesize.Thepeanutshelldosage,absorbingtime,in

5、itialconcentrationofZn2reactiontemperatureandpHontheabsorbingefficiencywasexploredaswell.Thesizeofpeanutshellisabout3971-5000nmwithaveragediameterof4366nmandthusitsspecificareais1.374X10bnf/m3.Themodifiedpeanutshellhasmoreabsorbingpointsonthesurfacethanthena

6、turaloneandthusitsabsorptionissuperior.Whenthedosageoftheadsorbentis1.0g/L，modifiedpeanutshellandunmodifiedpeanutshellswasonthepeakofremovalrateforZn^whichwere64.7%and63.7%respectively.WhentheinitialconcentrationofZn2’was10mg/L,twokindsofadsorbentfortheremova

7、lofZn2+werehigh,whichwere57.9%and56.3%respectively.WhenpHwas7,peanutshellwasatthemaximumre-movalrateofZn'whichwas68.4%.Whenthetemperaturewasat30degree,peanutshellwasatthemaximumremovalrateofZn^whichwas65.2%.WhenusingLangmuirandFreundlichisothermaladsorptionmo

8、delforlinearfittingoftheexperimentaldata,itfitwellinlinewiththeFreundlichisothermequation.AndAllwasnegativeindicatedthattheadsorptionwasanexothermicprocess,andAGwasnegativeindicatingthatt