School of Environmental Science and Engineering, Institute of Environmental Research at Greater Bay, Institute of Clean Energy and Materials, Guangzhou Key Laboratory for Clean Energy and Materials, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, 510006, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
Ecotoxicology. 2021 Sep;30(7):1419-1428. doi: 10.1007/s10646-021-02363-z. Epub 2021 Feb 23.
In this study, two cadmium-tolerant endophytic bacteria (Microbacterium sp. D2-2 and Bacillus sp. C9-3) were employed as biosorbents to remove Cd(II) from aqueous solutions. The influence of initial pH, initial Cd(II) concentration, adsorbent biomass, temperature and contact time on Cd(II) removal were investigated. Results showed that the Langmuir isotherms were found to best fit the equilibrium data, and the maximum biosorption capacities were found to be 222.22 and 163.93 mg/g at a solution pH of 5.0 for Microbacterium sp. D2-2 and Bacillus sp. C9-3, respectively. The biosorption kinetics followed well pseudo-second-order kinetics. Fourier transform infrared spectroscopic analysis suggested that the hydroxyl, carboxyl, carbonyl and amino groups on Microbacterium sp. D2-2 and Bacillus sp. C9-3 biomass were the main binding sites for Cd(II). The results presented in this study showed that Microbacterium sp. D2-2 and Bacillus sp. C9-3 are potential and promising adsorbents for the effective removal of Cd(II) from aqueous solutions.
在这项研究中，我们使用了两种耐镉内生细菌（D2-2 号微杆菌和 C9-3 号芽孢杆菌）作为生物吸附剂，从水溶液中去除 Cd(II)。考察了初始 pH 值、初始 Cd(II)浓度、吸附剂生物量、温度和接触时间对 Cd(II)去除的影响。结果表明，Langmuir 等温线最适合拟合平衡数据，在溶液 pH 值为 5.0 时，D2-2 号微杆菌和 C9-3 号芽孢杆菌的最大生物吸附容量分别为 222.22 和 163.93mg/g。生物吸附动力学较好地遵循拟二级动力学。傅里叶变换红外光谱分析表明，D2-2 号微杆菌和 C9-3 号芽孢杆菌生物量上的羟基、羧基、羰基和氨基是 Cd(II)的主要结合位点。本研究结果表明，D2-2 号微杆菌和 C9-3 号芽孢杆菌是一种很有前途的、有效的从水溶液中去除 Cd(II)的吸附剂。
