Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, China.
School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, China.
Environ Sci Pollut Res Int. 2022 Sep;29(41):62514-62536. doi: 10.1007/s11356-022-19725-7. Epub 2022 Apr 11.
The simultaneous biosorption of chromium (VI), copper (II), iron (II), and nickel (II) was investigated by alkaline-modified Chlorella vulgaris and Spirulina platensis in binary systems. The alkaline modified biosorbents were CV-KCl, SP-KCl, CV-Na2CO3, and SP-Na2CO3. The maximum removal efficiency recorded in this study was 99.7% with a biosorbent dosage of 0.3 g within a pH range of 2 to 6. The highest biosorption capacities obtained were 14.1, 13.5, 21.6, and 15.8 mg/g for Cr (VI), Cu (II), Fe (II), and Ni (II), respectively. The pseudo-second-order best described the biosorption rate, while the Langmuir isotherm model best described the biosorption equilibrium interaction. The values for Gibbs free energy (ΔG°) were in the range of 0.5 to 6.5 kJ/mol (Cr-Fe), 1.3 to 8.4 kJ/mol (Cr-Ni), and 3.9 to 11.3 kJ/mol (Cr-Cu) binary systems. This showed that the biosorption processes were characterized by physisorption reactions. The Temkin constant B values were in the range of 0.339 to 1.485 kcal/mol and the biosorption processes were largely exothermic reactions. The values for the Freundlich constant KF were between 1.4 and 10.4 (L/g), which indicated favourable biosorption. The Temkin isotherm model confirmed a strong binding affinity for Fe (II) and Ni (II). The results suggest that potassium chloride and sodium carbonate modification are very suitable for green algae and cyanobacteria for the efficient removal of heavy metals.
用碱性改性的小球藻和螺旋藻在二元体系中研究了铬（VI）、铜（II）、铁（II）和镍（II）的同时生物吸附。碱性改性的生物吸附剂分别为 CV-KCl、SP-KCl、CV-Na2CO3 和 SP-Na2CO3。在本研究中，当生物吸附剂用量为 0.3 g，pH 值范围为 2 至 6 时，记录到的最大去除效率为 99.7%。获得的最高生物吸附容量分别为 14.1、13.5、21.6 和 15.8 mg/g 用于 Cr(VI)、Cu(II)、Fe(II)和 Ni(II)。拟二阶模型最好地描述了生物吸附速率，而 Langmuir 等温线模型最好地描述了生物吸附平衡相互作用。对于 Gibbs 自由能 (ΔG°) 的值在 0.5 到 6.5 kJ/mol（Cr-Fe）、1.3 到 8.4 kJ/mol（Cr-Ni）和 3.9 到 11.3 kJ/mol（Cr-Cu）二元系统的范围内。这表明生物吸附过程的特点是物理吸附反应。Temkin 常数 B 值在 0.339 到 1.485 kcal/mol 的范围内，生物吸附过程是很大程度上的放热反应。Freundlich 常数 KF 的值在 1.4 到 10.4（L/g）之间，表明生物吸附有利。Temkin 等温线模型证实了对 Fe(II)和 Ni(II)具有很强的结合亲和力。结果表明，氯化钾和碳酸钠改性非常适合绿藻和蓝藻用于有效去除重金属。
