The present study evaluates the most suitable conditions for Ni(II) ions biosorption by green alga (Schizomeris leibleinii) using the Response Surface Methodology (RSM). Batch experiments were performed under RSM modeling (R${}^2=0$.9886), considering a number of factors, including pH, Biomass Dose, and Initial Ni(II) Concentration. Considering the presence of rich functional groups on the surface of the green marine alga, an uptake capacity of 50.46 ± 0.04 mg/g and a removal efficiency of 91.74% were obtained. The biosorption process was characterized by thermodynamic, isothermic, and kinetic studies. The results show that the removal process is exothermic, mono-layer, feasible, and controlled by the chemisorption stage. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) were utilized to characterize the biomass, confirming the feasibility of metal ions uptake. Moreover, the desorption stages were performed under optimal conditions with an efficiency of 80.33-71.00%. Schizomeris leibleinii was shown to be sustainable, reusable, and reliable for biosorption.

本研究使用响应表面方法（RSM）评估了绿藻（Schizomeris leibleinii）对Ni（II）离子进行生物吸附的最合适条件。批处理实验是在RSM模型下进行的（R${}^{\mathrm{2个}}=0$（.9886），请考虑许多因素，包括pH值，生物质剂量和初始Ni（II）浓度。考虑到绿色海藻表面上存在丰富的官能团，吸收能力为50.46±0.04 mg / g，去除效率为91.74％。通过热力学，等温和动力学研究来表征生物吸附过程。结果表明，该去除过程是放热的，单层的，可行的，并且受化学吸附阶段的控制。利用傅里叶变换红外光谱（FTIR），扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）表征生物量，证实了吸收金属离子的可行性。而且，解吸步骤在最佳条件下进行，效率为80.33-71.00％。