Recycling of Reactive Dye Using Semi-Interpenetrating Polymer Network from Sodium Alginate and Isopropyl Acrylamide
Recycling of Reactive Dye Using Semi-Interpenetrating Polymer Network from Sodium Alginate and Isopropyl Acrylamide
复制标题
DOI：
10.1002/app.41436
复制
发表时间：
2014-11
影响因子：
3
通讯作者：
V. Dhanapal;K. Subramanian
中科院分区：
文献类型：
--
作者：
V. Dhanapal;K. Subramanian
通过丙烯酸和异丙基丙烯酰胺（NIPAAm）在海藻酸钠（NaAlg）水溶液中自由基光共聚合成了一系列半互穿聚合物网络（semi-IPN）。对它们的结构（FT-IR）、热稳定性（TG/DTG）、形貌（SEM）、机械性能、活性蓝4（RB 4）染料吸附（624 mg/g）及其染色特性、染料和吸附剂的可重复使用性进行了评估。半互穿网络在空气中的热重图显示了初始热降解的零级动力学，活化能为 68.68 kJ/mol。染料吸附最适合 Langmuir 吸附等温线，动力学遵循伪二阶模型。水和染料扩散动力学遵循非菲克机制。热力学参数吉布斯自由能(DG�)、熵(DS�)和焓(DH�)的变化表明RB 4/semi-IPN体系的吸附是自发的放热过程。 VC 2014 Wiley Journals, Inc. J. Appl。聚合物。科学。 2014, 131, 40968。
A sequence of semi-interpenetrating polymer network (semi-IPN) were synthesized by free radical photo copolymerizing acrylic acid and isopropyl acrylamide (NIPAAm) in aqueous sodium alginate (NaAlg). Their structures (FT-IR), thermal stability (TG/DTG), morphology (SEM), mechanical properties, reactive blue 4 (RB 4) dye adsorption (624 mg/g) and its dying characteris- tics, reusability of dye and adsorbent were evaluated. TG thermograms of semi-IPN in air revealed zero order kinetics for initial step thermal degradation with an activation energy of 68.68 kJ/mol. Dye adsorption showed best fit for Langmuir adsorption isotherm and the kinetics followed pseudo-second-order model. The water and dye diffusion kinetics followed non-Fickian mechanism. The changes in thermodynamic parameters namely Gibbs free energy (DG � ), entropy (DS � ) and enthalpy (DH � ) indicated that the adsorp- tion was spontaneous and exothermic process for RB 4/semi-IPN system. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40968.