Varas Magdalena, Castro-Rojas Jorge, Contreras-Porcia Loretto, Ureta-Zañartu María Soledad, Blanco Elodie, Escalona Néstor, Muñoz Edmundo, Garrido-Ramírez Elizabeth
Escuela de Ciencias Ambientales y Sustentabilidad, Universidad Andres Bello, República 440, Santiago 8370251, Chile.
Departamento de Ecología y Biodiversidad, Facultad Ciencias de la Vida, Universidad Andres Bello, República 440, Santiago 8370251, Chile.
Int J Mol Sci. 2025 Apr 2;26(7):3307. doi: 10.3390/ijms26073307.
The effects of acid and alkali pretreatments on the physicochemical and textural properties of were evaluated to assess its potential for removing recalcitrant organic pollutants from aquatic systems. Untreated (UB), acid-pretreated (APB), and alkali-pretreated (APB) seaweed biomass were characterized using SEM, FTIR-ATR, N adsorption-desorption, and potentiometric titrations. Adsorption isotherms and kinetic studies, using methylene blue (MB) as a model pollutant, were conducted to evaluate removal performance. All biosorbents exhibited Langmuir behavior, with maximum adsorption capacities of 333 mg g (UB), 189 mg g (APB), and 526 mg g (APB). FTIR-ATR and SEM analyses revealed that alkali pretreatment increased the abundance of hydroxyl, carboxylate, and sulfonated functional groups on the seaweed cell walls, along with greater porosity and surface roughness, resulting in enhanced MB adsorption. In contrast, acid pretreatment increased the exposure of carboxylic, amine, and amide functional groups, reducing the electrostatic interactions. The adsorption energy values further supported this, while the intra-particle diffusion model indicated a two-step process involving MB diffusion onto the seaweed surface, followed by diffusion into internal pores. These findings highlight the potential application of -based biosorbents in the treatment of wastewater containing recalcitrant organic pollutants.
评估了酸预处理和碱预处理对[具体物质未给出]理化性质和质地特性的影响，以评估其从水生系统中去除难降解有机污染物的潜力。使用扫描电子显微镜（SEM）、衰减全反射傅里叶变换红外光谱（FTIR-ATR）、氮吸附-解吸和电位滴定对未处理的（UB）、酸预处理的（APB）和碱预处理的海藻生物质进行了表征。以亚甲基蓝（MB）作为模型污染物进行吸附等温线和动力学研究，以评估去除性能。所有生物吸附剂均呈现朗缪尔行为，最大吸附容量分别为333 mg/g（UB）、189 mg/g（APB）和526 mg/g（APB）。FTIR-ATR和SEM分析表明，碱预处理增加了海藻细胞壁上羟基、羧酸盐和磺化官能团的丰度，同时孔隙率和表面粗糙度增加，从而增强了MB的吸附。相比之下，酸预处理增加了羧基、胺基和酰胺官能团的暴露，减少了静电相互作用。吸附能值进一步支持了这一点，而颗粒内扩散模型表明这是一个两步过程，包括MB扩散到海藻表面，然后扩散到内部孔隙中。这些发现突出了基于[具体物质未给出]的生物吸附剂在处理含有难降解有机污染物的废水方面的潜在应用。
