文献类型：期刊文献

英文题名：Insight into efficient removal of Cr(VI) by magnetite immobilized with Lysinibacillus sp. JLT12: Mechanism and performance

作者：Zhu, Yuling[1];He, Xiaoyun[1,2];Xu, Jiali[2];Fu, Zheng[1];Wu, Siying[2];Ni, Jian[1];Hu, Baowei[1]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Huancheng West Rd 508, Shaoxing 312000, Peoples R China

年份：2021

卷号：262

外文期刊名：CHEMOSPHERE

收录：SCI-EXPANDED(收录号：WOS:000587290300102)、、WOS

基金：This study has been financially supported by the Natural Science Foundation of China (21876115, 21577093, 31500321).

语种：英文

外文关键词：Magnetite; Immobilization; Cr(VI); Passive layer; Lysinibacillus sp. JLT12

外文摘要：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. (C) 2020 Elsevier Ltd. All rights reserved.