多氨基改性蔗渣对水溶液中Pb^(2+)、Zn^(2+)、Cd^(2+)、Cu^(2+)吸附性能的研究

Adsorption Behavior of the Multi-amino-modified Bagasse for Pb(Ⅱ), Zn(Ⅱ),Cd(Ⅱ) and Cu(Ⅱ) in Aqueous Solution

蔗渣经多氨基改性处理后,得到多氨基改性蔗渣吸附剂。考察了多氨基改性蔗渣吸附剂对模拟废水中Pb2+、Zn2+、Cd2+、Cu2+的吸附性能,主要包括吸附时间、溶液pH值和温度对吸附量的影响以及吸附等温式的研究。研究表明,在实验范围内,Pb2+的吸附平衡时间为12h,适宜吸附Pb2+的pH值范围在4～5,Pb2+的最大吸附量为34.96mg/g;Zn2+的吸附平衡时间为20h,适宜吸附Zn2+的pH值在6.2左右,Zn2+的最大吸附容量为2.24mg/g;Cd2+的吸附平衡时间为20h,适宜吸附Cd2+的pH值在5.0左右,Cd2+的最大吸附容量为10.40mg/g;Cu2+的吸附平衡时间为20h;适宜吸附Cu2+的pH值在5.0左右;Cu2+在不同温度下的最大吸附容量为2.60mg/g。多氨基改性蔗渣对Pb2+、Zn2+、Cd2+、Cu2+的吸附均可用Freundlich方程和Langmuir方程描述。

Sugarcane bagasse was modified by multi amino group to prepare for metal adsorbent. The adsorp tion of Pb^2＋ , Zn^2＋ , Cd^2＋ and Cue： from aqueous single metal solutions by the modification was studied. Within the test range, the results showed that, Pb^2＋ , Zn^2＋ , Cd^2＋ and Cu^2＋ were quickly adsorbed by the modification, the ad sorption equilibration time of Pb^2＋ is 12h, and that of Zn^2＋ , Cd^2＋ and Cu^2＋ is 20h, respectively. The besl adsorption pH is in the range of 4-5 forPb^2＋ , about 6.2 for Zn^2＋ , and about5 forCd^2＋ and Cu^2＋. Themaxinmladsorptivecapacity of Pb^2＋ , Zn^2＋ , Cd^2＋ and Cu^2＋ is 34.96mg/g, 2.24mg/g, 10.40mg/g, 2.60mg/g, respectively. Langmuir and Freundlich equations can be used to fit the adsorption isotherm of Pb^2＋ , Zn^2＋ , Cd^2＋ and Cu^2＋ .