School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, PR China.
School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, PR China; School of Civil Engineering, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, PR China.
Chemosphere. 2021 Jan;262:127901. doi: 10.1016/j.chemosphere.2020.127901. Epub 2020 Aug 11.
In this work, Lysinibacillus sp. JLT12 was used to remove the Cr(VI)-induced passive layer on the magnetite. Mechanism study via dynamic kinetics, X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy analyses revealed that Lysinibacillus sp. JLT12 could remove the passive layer (lepidocrocite and goethite) to facilitate the further Cr(VI) reduction by magnetite. For large-scale applications, porous ceramsite (PC) was prepared with magnetite, kaolin, and fallen leaves. Lysinibacillus sp. was then immobilized on the holes in PC. Slow-released nutrients were added to immobilized porous ceramsite (IM-PC) at a ratio of 1.5:10 (g/g) to supply carbon, nitrogen, and phosphorus to Lysinibacillus sp. JLT12 with low secondary pollution. The performance of IM-PC was evaluated via a column experiment. The results indicate that, in the presence of Lysinibacillus, the break-through time and maximum adsorption ability of IM-PC were 11.67 h and 121.47 mg/g, respectively. These values are higher than those of PC. Additionally, break-through curves detected at 5, 10, and 15 days demonstrated that the usage life of IM-PC was significantly longer than that of PC.
在这项工作中，Lysinibacillus sp. JLT12 被用于去除磁铁矿上由 Cr(VI) 诱导的被动层。通过动力学分析、X 射线衍射、拉曼光谱和 X 射线光电子能谱分析的机理研究表明，Lysinibacillus sp. JLT12 可以去除被动层（纤铁矿和针铁矿），从而促进磁铁矿进一步还原 Cr(VI)。为了大规模应用，用磁铁矿、高岭土和落叶制备了多孔陶粒（PC）。然后将Lysinibacillus sp. 固定在 PC 的孔中。将缓慢释放的营养物以 1.5:10（g/g）的比例添加到固定多孔陶粒（IM-PC）中，为 Lysinibacillus sp. JLT12 提供低二次污染的碳、氮和磷。通过柱实验评价了 IM-PC 的性能。结果表明，在Lysinibacillus 的存在下，IM-PC 的穿透时间和最大吸附能力分别为 11.67 h 和 121.47 mg/g。这些值高于 PC 的值。此外，在第 5、10 和 15 天检测到的穿透曲线表明，IM-PC 的使用寿命明显长于 PC。
