褐藻对电镀废水中Au^(2+),Ag^+,Cu^(2+),Ni^(2+)生物吸附-解吸作用

Biosorption and Desorption of Au^(2+),Ag^+,Cu^(2+) and Ni^(2+) from Electroplating Wastewater by Brown Algae Laminaria japonica

研究电镀废水中金属离子Au2+,Ag+,Cu2+,Ni2+在褐藻(Laminaria japonica)上的生物吸附-解吸动力学.研究结果表明,Au2+,Ag+,Cu2+,Ni2+在藻粉上的生物吸附可以分为2个阶段.第1阶段为物理吸附,在10 min内快速达到平衡,其吸附过程可很好地用准二级动力学方程来描述,准二级速率常数(k2)分别为0.110 6,0.381 8,0.458 9,2.691 2 g.(mg.min)-1,平衡时吸附量(qe)分别为2.52,0.54,2.46,8.62 mg.g-1.Au2+,Ag+,Cu2+,Ni2+在藻粉上的生物解吸过程与吸附的过程相似,也可以很好地用准二级动力学方程来描述,其动力学参数(k2)分别为10.650 8,4.926 4,0.655 6,0.031 2 g.(mg.min)-1,吸附量(qe)分别为0.20,0.07,0.84,29.41 mg.g-1.Laminaria japonica可用于处理电镀废水和废水中贵重金属的回收.

The kinetics on biosorption and desorption of metal ions （Au^2＋,Ag^＋,Cu^2＋andNi^2＋ ） by brown algae Laminaria japonica is discussed in this paper. The kinetic experiments showed that the process of equilibrium had two steps, the first step was physical adsorption and reached equilibrium quickly, in less than 10 min The biosorption kinetics followed the pseudo-second order model. The pseudo-second order rate constant （kz） was obtained as 0. 110 6, 0. 381 8, 0. 458 9 and 2. 691 2 g·（mg·min）^-1 for Au^2＋,Ag^＋,Cu^2＋andNi^2＋ , respectively. The balanced sorption capacity （qe） was 2. 52, 0. 54, 2. 46 and 8. 62 mg·g^-1 for Au^2＋,Ag^＋,Cu^2＋andNi^2＋ , respectively. Desorption experiments was similar with sorption. The pseudo-second order rate constant （kz） for Au^2＋,Ag^＋,Cu^2＋andNi^2＋ was found to be 10. 650 8, 4. 926 4, 0. 655 6 and 0. 031 2 g·（mg·min）^-1 , the sorption capacity （qe） was received as 0. 20, 0. 07, 0. 84 and 29. 41 mg·g^-1, respectively. Laminaria japonica can be used as an efficient biosorbent material for the removal and recovery of heavy metal from electroplating wastewater.