改性玉米芯吸附水中重金属离子的实验研究

以玉米芯做原料，用酒石酸改性，利用改性玉米芯吸附水中的Cu2＋ 和Pb2＋实验结果表明，实验中改性玉米芯吸附水中的Cu2＋ 和Pb2＋的吸附条件为：pH为5，吸附时间为120min，初始浓度为50mg／L，投加量为0．5g，在此条件下，改性玉米芯对Cu2＋ 和Pb2＋的吸附去除率分别为68％和94％，普通玉米芯对Cu2＋和 Pb2＋的吸附去除率分别为25％和65％。吸附过程更加能够符合准二级动力学方程，吸附规律能够更好地用Freundlieh方程所描述。改性玉米芯对重金属离子有选择吸附的能力，Pb2＋更加容易被吸附。本实验对于重金属的去除具有一定的参考价值。

Experiment on adsorption of heavy metal ions in aqueous solution by modified corncob

Abstract ： The adsorption of Cu2 ＋ and Pb2＋ from aqueous solution was studied by modified corncob which was modified with tartaric acid. The results indicated that the conditions of adsorbing Cu2 ＋ and Pb2 ＋ from aqueous solution are that under the room temperature, the value of pH is 5,adsorption time is 120min, the modified corncob quantity is 0.5g, the initial concentration of water sample is 50mg/L. Under this situation, the ratio of elimination of the modified corncob was 68% and 94% while the common one was 25% and 65% for Cu2＋ and Pb2＋ , respectively. Pseudo -second -order equation was implemented to express the sorption mechanism by modified corncob. The process of adsorption were better fitted to the Freundlich model. Pb2＋ was more easily adsorbed by modified corncob because modified corncob has ca- pacity of choosing heavy metal ions. The study has a certain reference value for the treatment of water which was contaminated by heavy metal ions.