College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China.
College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China.
Chemosphere. 2018 Jun;200:380-387. doi: 10.1016/j.chemosphere.2018.02.020. Epub 2018 Feb 21.
Saccharomyces cerevisiae and nanoparticles of iron oxide (FeO) which were linked with chitosan (CS) through epichlorohydrin (ECH) were encapsulated in calcium alginate to prepare a novel type of bionanocomposites. Characterization results showed that the FeO-ECH-CS nanoparticles were quasi-spherical with an average diameter of 30 nm to which chitosan was successfully attached through epichlorohydrin. The saturation magnetization value of the nanoparticles was 21.88 emu/g, and ferrous and ferric irons were simultaneously observed in the magnetic nanoparticles. Data of atrazine removal by yeasts showed that both inactivated and live yeasts could decrease the concentration of atrazine effectively. The inactivated yeasts achieved 20% removal rate, which indicated that adsorption by the yeasts also played a role in the removal. Removal efficiency of atrazine was maximized at 88% under 25 °C, pH of 7 and an initial atrazine concentration of 2 mg/L. When the magnetic bionanocomposite was recycled and reused twice, only 12% and 20% drop in removal efficiency was observed at the first time and the second time severally. So, atrazine could be used by the yeasts as the sole carbon source for growth and multiplication, and both adsorption and biodegradation by the bionanocomposite contributed to atrazine removal.
酵母酿酒酵母和氧化铁（FeO）纳米颗粒通过表氯醇（ECH）与壳聚糖（CS）连接，然后被包封在海藻酸钙中，以制备新型的生物纳米复合材料。表征结果表明，FeO-ECH-CS 纳米颗粒呈准球形，平均直径为 30nm，壳聚糖通过表氯醇成功地附着在其上。纳米颗粒的饱和磁化强度值为 21.88 emu/g，并且在磁性纳米颗粒中同时观察到亚铁和三价铁。莠去津去除率的酵母数据表明，失活和活酵母都可以有效地降低莠去津的浓度。失活的酵母的去除率达到 20%，这表明酵母的吸附也在去除过程中起作用。在 25°C、pH 值为 7 和初始莠去津浓度为 2mg/L 的条件下，去除效率达到 88%。当磁性生物纳米复合材料回收并重复使用两次时，第一次和第二次的去除效率分别仅下降了 12%和 20%。因此，莠去津可以被酵母用作生长和繁殖的唯一碳源，生物纳米复合材料的吸附和生物降解都有助于莠去津的去除。
