Department of Chemical Engineering, MNGPC, Pudhucherry, 605008, India.
Department of Civil Engineering, Pondicherry Engineering College, Pudhucherry, 605014, India.
Environ Sci Pollut Res Int. 2022 Jun;29(28):41909-41922. doi: 10.1007/s11356-021-15185-7. Epub 2021 Jul 17.
In this research work, the biosorption potential of brown algae, Sargassum polycystum, was investigated for the removal of toxic metals, cadmium (Cd) and zinc (Zn), under controlled environmental conditions. The biosorbent prepared from the S. polycystum was characterized by Brunauer-Emmett-Teller (BET), scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR) techniques. The optimal conditions identified using Box-Behnken design (BBD) for Cd removal were pH: 4.65, biosorbent mass: 1.8 g/L and shaking speed: 76 rpm. For zinc, the optimum values were pH: 5.7, biosorbent mass: 1.2 g/L and shaking speed: 125 rpm, respectively. The equilibrium uptake of the metals, Cd and Zn, was evaluated by isotherm models. The Langmuir isotherm proved to be an excellent fit confirming single layer of sorption. The maximum Cd and Zn uptakes achieved were 105.26 mg/g and 116.2 mg/g respectively. The kinetics of Cd and Zn biosorption onto brown algae Sargassum polycystum, follows pseudo-second order. The thermodynamic parameters were determined, and the sorption process was found to be feasible. Desorption studies of Cd and Zn were performed, and the bio sorbent reproduced appreciable efficiency for five successive cycles of sorption-desorption process using HCl.
在这项研究工作中，研究了褐藻马尾藻的生物吸附潜力，以在受控环境条件下去除有毒金属镉（Cd）和锌（Zn）。用比表面积仪（BET）、扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）技术对从 S. polycystum 制备的生物吸附剂进行了表征。使用 Box-Behnken 设计（BBD）确定了去除 Cd 的最佳条件为 pH：4.65、生物吸附剂质量：1.8 g/L 和搅拌速度：76 rpm。对于锌，最佳值分别为 pH：5.7、生物吸附剂质量：1.2 g/L 和搅拌速度：125 rpm。通过等温线模型评估了金属 Cd 和 Zn 的平衡吸附量。Langmuir 等温线被证明是一种很好的拟合，证实了单层吸附。达到的最大 Cd 和 Zn 吸附量分别为 105.26 mg/g 和 116.2 mg/g。Cd 和 Zn 生物吸附到褐藻马尾藻上的动力学遵循伪二级动力学。确定了热力学参数，并且发现吸附过程是可行的。进行了 Cd 和 Zn 的解吸研究，使用 HCl 进行五次吸附-解吸循环后，生物吸附剂表现出相当高的效率。
