Galan Johanna, Trilleras Jorge, Zapata Paula A, Arana Victoria A, Grande-Tovar Carlos David
Grupo de Investigación Ciencias, Educación y Tecnología-CETIC, Programa de Química, Universidad del Atlántico, Carrera 30 No 8-49, Puerto Colombia 081008, Colombia.
Grupo de Compuestos Heterociclicos, Programa de Química, Universidad del Atlántico, Carrera 30 No 8-49, Puerto Colombia 081008, Colombia.
Life (Basel). 2021 Jan 25;11(2):85. doi: 10.3390/life11020085.
The use of dyes at an industrial level has become problematic, since the discharge of dye effluents into water disturbs the photosynthetic activity of numerous aquatic organisms by reducing the penetration of light and oxygen, in addition to causing carcinogenic diseases and mutagenic effects in humans, as well as alterations in different ecosystems. Chitosan (CS) is suitable for removing anionic dyes since it has favorable properties, such as acquiring a positive charge and a typical macromolecular structure of polysaccharides. In this study, the optimization of CS beads crosslinked with glutaraldehyde (GA) for the adsorption of reactive blue dye 4 (RB4) in an aqueous solution was carried out. In this sense, the response surface methodology (RSM) was applied to evaluate the concentration of CS, GA, and sodium hydroxide on the swelling degree in the GA-crosslinked CS beads. In the same way, RSM was applied to optimize the adsorption process of the RB4 dye as a function of the initial pH of the solution, initial concentration of the dye, and adsorbent dose. The crosslinking reaction was investigated by scanning electron microscopy (SEM), Fourier transformed infrared spectroscopy (FTIR), and X-ray diffractometry (XRD). The design described for the swelling degree showed an R (coefficient of determination) adjusted of 0.8634 and optimized concentrations (CS 3.3% , GA 1.7% , and NaOH 1.3 M) that were conveniently applied with a concentration of CS at 3.0% to decrease the viscosity and facilitate the formation of the beads. In the RB4 dye adsorption design, an adjusted R (0.8280) with good correlation was observed, where the optimized conditions were: pH = 2, adsorbent dose 0.6 g, and initial concentration of RB4 dye 5 mg/L. The kinetic behavior and the adsorption isotherm allowed us to conclude that the GA-crosslinked CS beads' adsorption mechanism was controlled mainly by chemisorption interactions, demonstrating its applicability in systems that require the removal of contaminants with similar structures to the model presented.
在工业层面上使用染料已成为一个问题，因为将染料废水排放到水中会干扰众多水生生物的光合作用，这是由于它会减少光和氧气的穿透，此外还会导致人类患癌疾病和诱变效应，以及对不同生态系统造成改变。壳聚糖（CS）适用于去除阴离子染料，因为它具有良好的特性，例如能获得正电荷以及具有典型的多糖大分子结构。在本研究中，对用戊二醛（GA）交联的CS珠粒在水溶液中吸附活性蓝染料4（RB4）进行了优化。从这个意义上说，应用响应面方法（RSM）来评估CS、GA和氢氧化钠的浓度对GA交联CS珠粒溶胀度的影响。同样，应用RSM来优化RB4染料的吸附过程，该过程是溶液初始pH值、染料初始浓度和吸附剂剂量的函数。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和X射线衍射法（XRD）对交联反应进行了研究。针对溶胀度所描述设计的调整决定系数R为0.8634，优化浓度（CS 3.3%、GA 1.7%和NaOH 1.3 M）在CS浓度为3.0%时可方便地应用，以降低粘度并促进珠粒的形成。在RB4染料吸附设计中，观察到调整后的R为0.8280，具有良好的相关性，其中优化条件为：pH = 2、吸附剂剂量0.6 g和RB4染料初始浓度5 mg/L。动力学行为和吸附等温线使我们得出结论，GA交联CS珠粒的吸附机制主要受化学吸附相互作用控制，证明了其在需要去除与所呈现模型结构相似污染物的系统中的适用性。
