海带吸附Ag(I)的物理化学特性研究  

STUDY ON THE PHYSIC-CHEMICAL PROPERTIES OF BIOSORPTION OF SILVER BY LAMINARIA JAPONICA

作　　者：王琳[1] 李清彪[1] 傅谋兴[1] 刘月英[2] 孙道华[1] 邓旭[1] 

机构地区：[1]厦门大学化学工程与生物工程系,厦门361005 [2]厦门大学生命科学学院,厦门361005

出　　处：《离子交换与吸附》2004年第1期32-39,共8页Ion Exchange and Adsorption

基　　金：国家自然科学基金(20376067);中国石油化工股份有限公司项目

摘　　要：以海带(Laminaria japonica)干粉为吸附剂，研究了海带吸附Ag^+的物理化学特性．结果表明：海带对Ag^+有很强的吸附能力，最大理论吸附量可达273mg/g干重．该吸附在20-40℃范围内是一个不依赖于温度的快速过程；对溶液的pH值有较宽的适应范围：海带浓度在0．5～4．0mg/L范围内，海带对Ag^+的吸附量与海带粉的浓度成反比；起始Ag^+浓度在10-800mg/L的范围内，海带对Ag^+的吸附量与起始Ag^+浓度成正比．吸附等温线符合Langmuir模型．TEM观察结果表明，海带能够将Ag^+还原成Ag°．海带可用于从含Ag^+的强酸废液中回收Ag^+，当废液中Ag^+浓度为121．9mg/L时，其回收率可达98.3％．Biosportion of heavy metals is an effective technology for the treatment of industrial wastewater. In this paper, dried biomass of Laminaria japonica was used as biosorbent for Ag+. The physic-chemical properties of biosorption of silver by Laminaria japonica were studied. The results showed that Laminaria japonica had relatively strong ability of adsorbing Ag+, and its theoretical maximum uptake capacity was 273mg/g dry biomass. Ag+ biosorption by Laminaria japonica was a rapid and temperature (20~40℃) independent process. In the range of pH value from 2 to 6, biosorptive process was unrelated to pH, and even in strong acid solution (pH<1) Laminaria japonica still showed a high efficiency for Ag+ uptake. During the process of biosorption, pH value of solution rose from 5.5 to 6.4, which suggested that ion exchange might be one of the biosorptive mechanisms. Ag+ adsorption followed Langmuir model. The biosorptive capacity (q) of Ag+ decreased with increase of biomass concentration (Cb) (0.5~4.0g/L), and rose with increase of initial Ag+ concentration (Ci) (10~800mg/L). TEM observation indicated that the Ag+ ions could be reduced to Ag0 particles by Laminaria japonica. Moreover, Laminaria japonica could be used to recover Ag+ from strong acid wastewater, and the biosorptive efficiency (E) reached 98.3%. As the Ag+ concentration (Ci) was 121.9mg/L. The result indicated that Laminaria japonica was suitable for the development of effective biosorbent for the removal and recovery of silver from wastewater.

关 键 词：海带 生物吸附 银离子 物理化学特性 废水处理 

分 类 号：X703.5[环境科学与工程—环境工程]