In this study, a modification of exopolysaccharide (EPS) from Spirulina sp. algae biomass with silica (HES) and exopolysaccharide from Spirulina sp. algae biomass with silica coated by magnetite particles (HESM) has been done successfully. A series of experiments with the batch method were conducted to test the ability of HESM adsorption of Pb(II) ions in solution. Identification of functional groups of HESM adsorbents was studied using infrared spectrometer (IR) while surface morphological analysis and composition of the constituent elements of HESM were performed using scanning electron microscope-energy (SEM). Concentration of Pb(II) ion in the adsorption process were analysed by inductively coupled plasma-atomic emission spectrometry (ICP-AES Adsorption of Pb(II) ions with HES and HESM is optimum at pH 7 and concentration at 25 ppm with the adsorption capacity on HES at 3.85 mg g⁻¹ while on HESM at 272.63 mg g⁻¹, contact time of 15 min and it tends to follow second orde pseudo kinetic model and Langmuir adsorption isotherm model.

在这项研究中，对来自螺旋藻的胞外多糖 (EPS) 进行了修饰。含有二氧化硅 (HES) 和来自螺旋藻的胞外多糖的藻类生物质sp. 用磁铁矿颗粒（HESM）包覆二氧化硅的藻类生物质已成功完成。使用批量方法进行了一系列实验，以测试 HESM 对溶液中 Pb(II) 离子的吸附能力。使用红外光谱仪 (IR) 研究了 HESM 吸附剂官能团的鉴定，同时使用扫描电子显微镜-能量 (SEM) 进行了 HESM 组成元素的表面形态分析和组成。通过电感耦合等离子体原子发射光谱法分析吸附过程中 Pb(II) 离子的浓度 (ICP-AES Adsorption of Pb(II) ion with HES and HESM is the best at pH 7 and 25 ppm with the 吸附容量HES 为 3.85 mg g ^-1而 HESM 为 272.63 mg g ^-1，接触时间为 15 分钟，趋于遵循二级假动力学模型和朗缪尔吸附等温线模型。