Solano-Reynoso Aydeé M, Quispe-Quispe Ruth Fany, Choque-Quispe Yudith, Taipe-Pardo Fredy, Flores-Ccorisapra Yovana, Yauris-Silvera Celia R, Peralta-Guevara Diego E, Carhuarupay-Molleda Yakov Felipe, Rodriguez-Cardenas Liliana, Choque-Quispe David, Ligarda-Samanez Carlos A
Basic Sciences Department, Universidad Nacional José María Arguedas, Andahuaylas 03701, Peru.
Research Group for the Development of Advanced Materials for Water and Food Treatment, Universidad Nacional José María Arguedas, Andahuaylas 03701, Peru.
Polymers (Basel). 2024 Dec 18;16(24):3515. doi: 10.3390/polym16243515.
The aim of this study was to evaluate the removal of Pb and As from an aqueous solution using corn residue cellulose nanocrystals (NCCs). The corn husk was subjected to alkaline digestion, followed by bleaching and esterification with 3% citric acid to obtain NCCs. A 10 ppm multimetal solution of Pb and As was prepared. The adsorption process was evaluated by adjusting the pH and NCC dosage, optimized through the nonlinear regression of empirical mathematical models. Based on the optimal parameters, the kinetics were evaluated using the PFO and PSO models. The NCCs displayed nanometer-level characteristics with a particle size less than 383.7 nm, a ζ potential in the range of -28-70 mV, pH with an acidic tendency, a porous crystal structure as evaluated through SEM images, and the presence of functional groups with a high chelating capacity, as identified via FTIR. Optimum values of pH 8.0 and 20 mg/L of the NCC dose were found, from which it was observed that the PFO, PSO, and Elovich kinetics showed > 0.974, with an adsorption capacity in the order Pb > As. The adsorbent-formulated NCCs presented a good capacity to remove heavy metals from aqueous media.
本研究的目的是评估利用玉米残渣纤维素纳米晶体（NCCs）从水溶液中去除铅和砷的效果。对玉米 husk 进行碱消化，随后用 3%柠檬酸进行漂白和酯化以获得 NCCs。制备了 10 ppm 的铅和砷多金属溶液。通过调节 pH 和 NCC 用量来评估吸附过程，并通过经验数学模型的非线性回归进行优化。基于最佳参数，使用 PFO 和 PSO 模型评估动力学。NCCs 呈现出纳米级特征，粒径小于 383.7 nm，ζ 电位在 -28 - 70 mV 范围内，pH 呈酸性趋势，通过扫描电子显微镜（SEM）图像评估具有多孔晶体结构，并且通过傅里叶变换红外光谱（FTIR）鉴定存在具有高螯合能力的官能团。发现 pH 为 8.0 和 NCC 剂量为 20 mg/L 的最佳值，从中观察到 PFO、PSO 和 Elovich 动力学显示 > 0.974，吸附容量顺序为 Pb > As。吸附剂配方的 NCCs 具有从水介质中去除重金属的良好能力。
