摘要
为了探讨海带粉吸附剂工业运用的可能性,采用海藻酸钙包埋法对海带粉进行固定,在合适的反应条件下对Ni2+、Cu2+、Pb2+三种重金属离子进行吸附.采用二级动力学方程、Langmuir方程和Freundlich方程对吸附过程进行模拟.结果显示二级动力学方程能很好地对固定化海带粉吸附剂吸附Ni2+、Cu2+、Pb2+过程进行拟合,平衡时的吸附量分别达到0.317 4、0.465 9、0.501 5 mg/g,对应的二级动力学常数为0.128、0.116、0.114 g/(mg.min),即三种离子的吸附速率Ni2+>Cu2+>Pb2+;Langmuir方程和Freundlich方程都能较好地模拟Ni2+、Cu2+、Pb2+的吸附过程,根据Lang-muir方程Ni2+、Cu2+、Pb2+的最大吸附量分别达到2.786、13.699、39.063 mg/g,即吸附效果Pb2+>Cu2+>Ni2+,该实验对日后开发海藻生物吸附剂并将其大量制成应用产品有一定的意义.
To probe the industrial application of absorption with laminaria powder, calcmm algmate was used to im mobilize laminaria powder for biosorption of Ni2 ＋ , Pn2 ＋ and Cu2 ＋ under a proper condition. During the simulation, kinetic and isotherm processes were studied with second order kinetic model; Freundlich and Langmuir isotherm model. The results show that the adsorption process followed these there models well. According to second order ki netic model, the adsorption equilibrium of Ni2＋Cu2＋ ,Pb2＋ were 0. 317 4 ,0. 465 9,0. 501 5 mg/g, the corre sponding constants were 0. 128,0.116,0.114 g/（ nag min）, which means that the abosorption rate of 3 biosorp tions were in sequence of Ni2＋ 〉 Cu2＋ 〉 Pb2＋ ; According to Langmuir isotherm model, the maximum biosorption capacity of Ni2＋ , Pb2＋ and Cu2＋ were 2.786, 39. 063 and 13. 699 rag/g, which means that the effects of 3 bio sorptions were in sequence of Pb2 ＋〉 Cu2 ＋ 〉 Ni2＋. These results are meaningful for future development of immobi lized laminaria powder in industrial application.
出处
《应用海洋学学报》
CAS
CSCD
2013年第2期272-277,共6页
Journal of Applied Oceanography
基金
福建省科技计划重点资助项目(2009H0040)
泉州市科技计划重大资助项目(2008ZD3_5)
关键词
海洋化学
固定化海带粉
生物吸附
动力学
热力学
marine chemistry
immobilized laminaria powder
biosorption
kinetics
thermodynamics
