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丝光改性竹笋皮对亚甲基蓝的吸附研究

DOI: 10.7685/j.issn.1000-2030.2014.04.024, PP. 163-169

Keywords: 丝光改性竹笋皮,吸附,亚甲基蓝,紫外-可见分光光度法

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Abstract:

采用竹笋皮和丝光改性竹笋皮为吸附材料,研究了二者对亚甲基蓝的吸附行为,评价二者对亚甲基蓝的吸附去除性能。采用扫描电镜、红外光谱和比表面积等方法对2种材料的形貌和结构进行表征;采用静态吸附法,以紫外-可见分光光度法为检测手段,探讨了pH值、反应时间、添加量以及亚甲基蓝初始浓度等因素对亚甲基蓝吸附能力的影响;采用Langmuir吸附等温模型对其进行热力学模拟研究,Lagergren准一级动力学方程和Ho准二级动力学方程对其进行动力学模拟研究。结果表明1)与竹笋皮相比,丝光竹笋皮更易形成分子内氢键;表面含有大量紧密排列的孔隙和不规则的沟槽;比表面积为1.516m2?g-1,高于未改性竹笋皮比表面积(1.425m2?g-1)。2)在低酸度时亚甲基蓝基本不被吸附;当pH值从3增至8时,吸附量不断增大;当pH值达到8以后,吸附量达到最大且保持平衡。3)随着溶液中亚甲基蓝初始浓度的增加,到达平衡时丝光改性竹笋皮对亚甲基蓝的饱和吸附量先是急剧增加,然后保持不变。4)当亚甲基蓝质量浓度仅为5mg?L-1时,30min就可达到吸附平衡,当亚甲基蓝质量浓度升至50和100mg?L-1时,则需要60min才可到达吸附平衡。5)对于初始质量浓度为100mg?L-1的亚甲基蓝溶液,100mg的丝光改性竹笋皮即可达到定量吸附。丝光改性竹笋皮对亚甲基蓝的吸附动力学和热力学分别符合准二级吸附模型和Langmuir等温吸附模型。在pH8、反应时间为60min、材料用量为10mg以及亚甲基蓝初始质量浓度为100mg?L-1时丝光改性竹笋皮对亚甲基蓝的最大吸附容量可达25mg?g-1,可有效去除水中亚甲基蓝。

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