摘要
探究嗜酸性细菌对废旧线路板浸出的吸附行为及其动力学模型是生物浸出机制研究的重要基础.本研究通过考察接种不同浓度氧化亚铁硫杆菌(A.ferrooxidans)浸出线路板中铜的吸附行为,探索了菌体在线路板粉末表面的吸附过程,分析了其吸附行为的动力学特性.结果表明,A.ferrooxidans在线路板粉末表面的吸附均于5 h内达到平衡.随着初始菌浓度的增大,吸附速率和吸附的微生物量也随之增大.初始菌体浓度为2.4×105、2.4×107和2.4×109cells·m L-1时对应的最大吸附量分别为1.8701、2.3552和2.9833 mg·g-1,吸附的微生物量占总生物量的比例分别为43.75%、53.97%和55.94%,铜的浸出率分别达到71.20%、88.33%和95.05%.进一步的非线性拟合结果显示,一级动力学模型适用于A.ferrooxidans与线路板粉末的吸附行为,模型拟合度(R2)分别达到0.9321、0.9134和0.9193.
Exploration of the adsorption behavior and kinetics models of leaching of copper from waste printed circuit boards by acidophilic bacteria is the basis of bioleaching mechanism. Under different initial concentrations of A. ferrooxidans,the adsorption behavior of copper leaching from circuit boards by A. ferrooxidans was investigated,the adsorption of Acidithiobacillus ferrooxidans( A. ferrooxidans) onto the surface of circuit boards was estimated and the kinetic characteristics of adsorption behavior was analyzed. The results indicated that the adsorption equilibrium of A. ferrooxidans onto the surface of circuit boards was reached in 5 h. The adsorption rates and attached biomass increased with the increase of the initial concentration of bacteria. With the initial concentrations of 2. 4 × 105,2. 4 × 107 and 2. 4 × 109cells·m L- 1,the individual maximum sorption capacity were 1. 8701,2. 3552 and 2. 9833 mg·g- 1,the percentage of adsorbed biomass of the total reached 43. 75%,53. 97% and 55. 94%,and the leaching efficiency of copper achieved 71.20%,88. 33% and 95. 05%,respectively. Further analysis of nonlinear fitting proved that the pseudo-first order kinetic model was suitable for the description of adsorption behavior between A. ferrooxidans and circuit boards and R-Squared were 0. 9321,0. 9134 and 0. 9193,respectively.
出处
《环境科学学报》
CAS
CSCD
北大核心
2015年第5期1471-1476,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.51178191)
教育部新世纪优秀人才支持计划(No.NCET-11-0166)
广东省科技计划项目(No.2008B030302004)~~
