(1. 西南科技大學(xué) 固體廢物處理與資源化教育部重點實驗室，綿陽 621010；
2. 西南科技大學(xué) 環(huán)境與資源學(xué)院，綿陽 621010；
3. 林肯大學(xué) 農(nóng)業(yè)與生命科學(xué)系，新西蘭 基督城8006)
摘 要: 探討模擬重金屬Pb2+-Cu2+混合廢水中面包酵母菌的動力學(xué)吸附行為和各離子間的點位競爭吸附過程。選擇面包酵母菌為吸附劑，分別對不同的Pb2+-Cu2+廢水進行動力學(xué)吸附分析和二級動力學(xué)模型計算，同時，也進行SEM/EDS分析。結(jié)果表明：在最初60 min時，酵母菌對Pb2+-Cu2+廢水中離子已有較好的吸附效果，在整個動力學(xué)吸附過程中，酵母菌對廢水中離子的吸附關(guān)系總是存在 ＞ ＞ 。二級動力學(xué)方程計算結(jié)果顯示：在Cu2+競爭脅迫環(huán)境下，增大Cu2+的比例使酵母菌對Pb2+的吸附速率更快，也證明Pb2+在吸附點位競爭過程中的明顯優(yōu)勢，EDS測試結(jié)果也證實這點。SEM分析發(fā)現(xiàn)：酵母菌吸附Cu2+和Pb2+后，菌體出現(xiàn)不規(guī)則變形并遭受一定的破壞，有內(nèi)部物質(zhì)外泄現(xiàn)象。酵母菌對Cu2+和Pb2+都有一個快速吸附過程，相對而言其對Pb2+的吸附更具優(yōu)勢。
關(guān)鍵字: 環(huán)境保護；鉛；銅；廢水；面包酵母菌；生物吸附；動力學(xué)
（1. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education,
Southwest University of Science and Technology, Mianyang 621010, China;
2. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;
3. Agriculture and Life Science Division, Lincoln University, Christchurch 8006, New Zealand）
Abstract:The kinetics biosorption behavior of Baker’s yeast in the simulation heavy metal waste water of Pb2+-Cu2+ was investigated. The autoclaved Baker’s yeast was chosen as a biosorbent, and then the kinetics biosorption process and second-kinetics model were analyzed, respectively. The results show that there is very good biosorption effect at first 60 min. At the same initial concentration for heavy metal ions, there are the relations: ＞ ＞ . The second-kinetics biosorption model’s analysis shows that the biosorption speed to Pb2+ becomes rapid with the initial concentration of Cu2+ increasing, proving that there is obvious advantage to Pb2+ in the biosorption sites competition process. And the analysis results of EDS approve it also. The analysis of SEM shows that the Baker’s yeast cells are broken after the biosorption of Pb2+ and Cu2+ ions. The toxicity of heavy ions to yeast cells makes the cells distort and break. The cytoplasm leaks out from the yeast cells. The biosorption of baker’s yeast to Pb2+ and Cu2+ is a rapid and preferable process, and there is a more obvious advantage for Baker’s yeast to Pb2+ than Cu2+.
Key words: environmental protection; copper; lead; waste water; Baker’s yeast; biosorption; kinetics
