Department of Earth Resources Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan.
J Hazard Mater. 2013 Nov 15;262:38-47. doi: 10.1016/j.jhazmat.2013.08.027. Epub 2013 Aug 21.
Microbial transformations, a primary pathway for the Mn oxides formation in nature, provide potential for material-oriented researchers to fabricate new materials. Using Mn oxidizing fungus Paraconiothyrium sp. WL-2 as a bio-oxidizer as well as a bio-template, a special lithium ion sieve with microtube morphology was prepared through a solid-state transformation. Varying the calcination temperature from 300 to 700 °C was found to influence sample properties and consequently, the adsorption of Li(+). Lithium manganese oxide microtube (LMO-MTs) calcined at different temperatures as well as their delithiated products (HMO-MTs) were characterized by X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Calcination temperatures affect not only the content but also the crystal structure of LMO spinel, which is important in Li(+) adsorption. The optimized sample was obtained after calcination at 500 °C for 4h, which shows higher Li(+) adsorption capacity than particulate materials.
微生物转化是自然界中 Mn 氧化物形成的主要途径，为面向材料的研究人员提供了制造新材料的潜力。利用 Mn 氧化真菌 Paraconiothyrium sp. WL-2 作为生物氧化剂和生物模板，通过固态转化制备了具有微管形态的特殊锂离子筛。发现改变煅烧温度（300 至 700°C）会影响样品的性质，进而影响 Li(+)的吸附。不同温度下煅烧的锂锰氧化物微管（LMO-MTs）及其脱锂产物（HMO-MTs）通过 X 射线衍射（XRD）、X 射线吸收精细结构（XAFS）光谱、扫描电子显微镜（SEM）和透射电子显微镜（TEM）进行了表征。煅烧温度不仅影响 LMO 尖晶石的含量，而且影响其晶体结构，这对 Li(+)吸附很重要。在 500°C 下煅烧 4 小时后得到了优化的样品，其 Li(+)吸附容量高于颗粒材料。
