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.

在本研究中，采用两种耐镉内生细菌（微杆菌属 D2-2 和芽孢杆菌属 C9-3）作为生物吸附剂从水溶液中去除 Cd(II)。研究了初始 pH、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，发现 Langmuir 等温线最符合平衡数据，并且发现最大生物吸附容量分别为 222.22 和 163.93 毫克/克，在溶液 pH 值为 5.0 时，微杆菌属。D2-2和芽孢杆菌sp. C9-3，分别。生物吸附动力学遵循良好的伪二级动力学。傅里叶变换红外光谱分析表明，微杆菌属的羟基、羧基、羰基和氨基。D2-2 和芽孢杆菌。C9-3 生物量是 Cd(II) 的主要结合位点。本研究中提出的结果表明，微杆菌属。D2-2 和芽孢杆菌。C9-3 是一种潜在且有前景的吸附剂，可有效去除水溶液中的 Cd(II)。