Study on adsorption of Cu2+ and Pb2+ by acid modified seedy melon peel
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摘要: 利用酸改性籽瓜皮,使用扫描电子显微镜与红外光谱分析结构特征,并研究酸度、吸附剂质量、时间、浓度对Cu2+与Pb2+吸附性的影响。结果表明:静态吸附符合二级动力学方程及Langmuir吸附等温线,吸附机理是自发的化学吸附过程,Cu2+与Pb2+最大吸附量分别为14.72、41.69 mg/g;最佳吸附条件是:p H4,料液比2.5 g/L,吸附时间200 min。在流动性吸附应用中,对低浓度Cu2+与Pb2+吸附,酸改性籽瓜皮具有较快的吸附速度,吸附率及解吸率均很高,可重复使用,循环次数大于10次。Abstract: Using acid to modify seedy melon peel,the adsorbent structure characteristics was analyzed by scanning electron microscope and infrared spectroscopy. The effect of concentration,adsorbent quality,time and acidity on the adsorption of Cu2+ and Pb2+ was studied. Experimental results showed that the static adsorption accorded with the Pseudo- second- order kinetic and Langmuir adsorption isotherm,adsorption mechanism was spontaneous chemical adsorption process.Maximum adsorption capacity of Cu2+ and Pb2+ was calculated,which was 14.72 mg / g and 41.69 mg / g.The optimum adsorption conditions was found that p H was 4,the ratio of material to liquid ratio was 2.5 g / L,the adsorption time was 200 min.In the application of flowing adsorption,acid modified seedy melon had faster adsorption speed in low concentrations,high adsorption and desorption rate,also it could be reused,cycle number was more than 10 times.
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Keywords:
- seedy melon peel /
- adsorption /
- desorption /
- adsorption isotherm /
- adsorption kinetics
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