Tenório E Silva Dayane Caroline, da Silva Michael Lopes Mendes, de Farias Paulo Henrique Miranda, Galvão Chesque Cavassano, Costa Elerson Max Dos Santos, Melo Rafael Araújo, Medeiros Eliane Bezerra de Moraes, de Lima Filho Nelson Medeiros
Departamento de Engenharia Química, Centro de Tecnologia e Geociências, Universidade Federal de Pernambuco, Recife, PE, 50740-590, Brazil.
Departamento de Engenharia Química, Centro de Tecnologia e Geociências, Universidade Federal de Pernambuco, Recife, PE, 50740-590, Brazil.
Int J Biol Macromol. 2025 Feb;289:138863. doi: 10.1016/j.ijbiomac.2024.138863. Epub 2024 Dec 16.
In this work, a polymeric blend of polyaniline (PAni) and chitosan (Chi), modified with Sucrose Octaacetate (SOA), was synthesized and characterized using different techniques. The blend was used as an adsorbent to remove Remazol Black (RB) dye from aqueous solutions. The blend was synthesized using the chemical oxidation method with ammonium persulfate as the oxidizing agent. Characterization was carried out using SEM, FT-IR, UV-Vis, BET, TGA, Conductivity, and PZc techniques. The blend structure appeared as clusters, providing a favorable surface area for adsorption. The results showed that SOA improved the conductivity of the blend without altering the structure and oxidative state of PAni. The study investigated the adsorption of RB, considering the influence of adsorbent dosage, initial dye concentration, pH, and temperature. Kinetic and equilibrium studies, thermodynamic analysis, synthetic effluent testing, and adsorbent reuse tests were conducted. The optimal adsorption conditions, within the studied range, were adsorbent dosage of 0.25 g L, dye concentration of 60 mg L, pH range of 2 to 7, and temperature of 30 °C. Equilibrium results indicated that the Langmuir model was the most representative, with a maximum adsorption capacity of q = 285.23 mg g and R = 0.01, indicating favorable adsorption. The kinetic study revealed an equilibrium constant of K = 0.421 L mg and a process order 0.63. The adsorption process followed a pseudo-first-order kinetics, demonstrating rapid adsorption on the adsorbent surface. The adsorption was physical, endothermic, and spontaneous, showing increased randomness with temperature. RB removal from synthetic effluent was effective within the pH range of 2-7, with the dye removal efficiency from the aqueous phase remaining above 74 % for up to 4 cycles of adsorption-desorption. The results support the hypothesis that the PAni-SOA@Chi blend is a promising alternative for removing this dye from the waste.
在本研究中，合成了一种用八乙酸蔗糖酯（SOA）改性的聚苯胺（PAni）和壳聚糖（Chi）的聚合物共混物，并采用不同技术对其进行了表征。该共混物用作吸附剂，用于从水溶液中去除活性黑（RB）染料。该共混物采用化学氧化法合成，以过硫酸铵作为氧化剂。使用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、紫外可见光谱（UV-Vis）、比表面积分析仪（BET）、热重分析仪（TGA）、电导率仪和零电荷点（PZc）技术进行表征。共混物结构呈团簇状，为吸附提供了良好的表面积。结果表明，SOA提高了共混物的电导率，而不改变PAni的结构和氧化态。该研究考察了吸附剂用量、初始染料浓度、pH值和温度对RB吸附的影响。进行了动力学和平衡研究、热力学分析、合成废水测试以及吸附剂重复使用测试。在所研究的范围内，最佳吸附条件为吸附剂用量0.25 g/L、染料浓度60 mg/L、pH值范围2至7以及温度30℃。平衡结果表明，朗缪尔模型最具代表性，最大吸附容量q = 285.23 mg/g，相关系数R = 0.99，表明吸附效果良好。动力学研究表明平衡常数K = 0.421 L/mg，过程级数为0.63。吸附过程遵循准一级动力学，表明在吸附剂表面快速吸附。吸附为物理吸附、吸热且自发进行，表明随温度升高随机性增加。在pH值2 - 7范围内，从合成废水中去除RB是有效的，在高达4个吸附 - 解吸循环中，水相中染料去除效率保持在74%以上。结果支持了PAni - SOA@Chi共混物是从废水中去除这种染料的有前景的替代物这一假设。
