Lessa Emanuele Ferreira, Gerhardt Rafael, Arabidian Viviane, da Silva Keli Arruda, da Silveira Junior Nauro, Jaeschke Débora Pez, Cadaval Junior Tito Roberto Sant'Anna, Pinto Luiz Antonio de Almeida
Industrial Technology Laboratory, School of Chemistry and Food, Federal University of Rio Grande - FURG, Italia Avenue, km 08, Carreiros District, 96203-900 Rio Grande, RS, Brazil.
ACS Omega. 2025 Jul 17;10(29):31840-31853. doi: 10.1021/acsomega.5c03164. eCollection 2025 Jul 29.
In response to growing environmental concerns about dye-contaminated wastewater, this study introduces a novel approach to enhance the performance of chitosan-based adsorbents by incorporating carbon nanotubes into film matrices. The chitosan/carbon nanotubes (CN/CNTs) films were prepared via the casting technique using the same amount of chitosan but with varying proportions of CNTs (0.1, 0.3, and 0.5% w w). The resulting films showed uniform thickness, progressive darkening with increasing CNT content, and improved mechanical strength (up to 83.3 MPa) and elongation capacity (up to 29.3%) with higher CNTs concentration. Adsorption studies highlighted the influence of pH on dye removal, with maximum adsorption capacities of 800 mg g for crystal violet (pH 8, CS/CNT 0.5%) and 660 mg g for tartrazine yellow (pH 2, CS/CNT 0.1%). The PSO model provided the best fit for the kinetic data in all conditions studied, with varying from 0.0003 to 0.00053 g mg min. For crystal violet, the Henry model best fit the experimental data with values ranging from 4.34 to 5.85 L g. In contrast, the Freundlich model was the most appropriate for yellow tartrazine, showing values between 8.11 and 20.23 (mg g)-(mg L) . Desorption tests using NaOH solutions demonstrated reusability, with a performance loss of 12% for crystal violet and 6% for yellow tartrazine after four cycles. These findings underscore the potential of CS/CNTs films as sustainable, high-capacity adsorbents for wastewater treatment applications, advancing the design of biopolymer-based composite materials for environmental remediation.
针对对染料污染废水日益增长的环境担忧，本研究引入了一种新方法，通过将碳纳米管掺入薄膜基质来提高壳聚糖基吸附剂的性能。壳聚糖/碳纳米管（CN/CNTs）薄膜采用流延技术制备，使用相同量的壳聚糖，但碳纳米管的比例不同（0.1%、0.3%和0.5%，重量/重量）。所得薄膜厚度均匀，随着碳纳米管含量的增加逐渐变黑，并且随着碳纳米管浓度的提高，机械强度（高达83.3MPa）和伸长能力（高达29.3%）得到改善。吸附研究突出了pH对染料去除的影响，结晶紫（pH 8，CS/CNT 0.5%）的最大吸附容量为800mg/g，柠檬黄（pH 2，CS/CNT 0.1%）的最大吸附容量为660mg/g。在所有研究条件下，PSO模型对动力学数据拟合最佳，k值在0.0003至0.00053g mg-1 min-1之间变化。对于结晶紫，亨利模型最符合实验数据，K值在4.34至5.85L g-1之间。相比之下，弗伦德利希模型最适合柠檬黄，显示n值在8.11至20.23（mg g-1）-1/（mg L-1）-1/n之间。使用NaOH溶液的解吸试验证明了其可重复使用性，经过四个循环后，结晶紫的性能损失为12%，柠檬黄的性能损失为6%。这些发现强调了CS/CNTs薄膜作为用于废水处理应用的可持续、高容量吸附剂的潜力，推动了用于环境修复的生物聚合物基复合材料的设计。
