Dalal Shimaa R
Botany Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt.
Sci Rep. 2025 Jul 12;15(1):25199. doi: 10.1038/s41598-025-09752-y.
Dyes are toxic, mutagenic, and hazardous to aquatic organisms. Calcium alginate beads derived from Padina pavonica were utilized for crystal violet (CV) bioremoval from water. They were examined using FTIR and SEM before and after CV biosorption, results demonstrated that the characteristics of alginate beads changed after CV biosorption. The bioremoval process of CV varies by environmental parameters including pH, incubation duration, alginate dosage, and initial CV concentration. These environmental factors influence on the CV biosorption process were investigated as one factor at a time. At pH 6, 70 mg/25 mL alginate dosage, and 2 mg L CV concentration after 5 h of incubation, the highest CV bioremoval efficiency was achieved. A correlation existed between the pseudo-second-order kinetic model and the kinetic assessments of the current results, which indicated chemisorption of CV on alginate beads. Moreover, the isotherms calculations revealed that the results were fit with Freundlich model, in which values of Freundlich constant (K), correlation coefficient (R) and n were 1.582, 0.988 and 2.378, respectively, indicating that CV particles are arranged as multilayers on alginate beads surface. Calcium alginate beads derived from Padina pavonica are promising in dye biosorption from aqueous solutions with no hazardous influence on the environment.
染料具有毒性、致突变性，对水生生物有害。利用来源于波状团扇藻的海藻酸钙珠从水中生物去除结晶紫（CV）。在CV生物吸附前后，使用傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）对其进行检测，结果表明CV生物吸附后海藻酸钙珠的特性发生了变化。CV的生物去除过程因环境参数而异，包括pH值、孵育时间、海藻酸盐用量和初始CV浓度。一次研究一个因素，考察这些环境因素对CV生物吸附过程的影响。在pH值为6、海藻酸盐用量为70 mg/25 mL、孵育5小时后CV浓度为2 mg/L时，实现了最高的CV生物去除效率。伪二级动力学模型与当前结果的动力学评估之间存在相关性，这表明CV在海藻酸钙珠上发生了化学吸附。此外，等温线计算表明结果符合弗伦德里希模型，其中弗伦德里希常数（K）、相关系数（R）和n的值分别为1.582、0.988和2.378，表明CV颗粒以多层形式排列在海藻酸钙珠表面。来源于波状团扇藻的海藻酸钙珠在从水溶液中生物吸附染料方面具有前景，且对环境无有害影响。
