In this study, a novel bead form IPN type resin comprising poly (2-Dimethylaminoethyl) methacrylate and carboxymethyl chitosan networks with a high dye adsorption capacity. The adsorbent was synthesized by a combination of serial reactions, including bead formation, cross-linking, and carboxymethylation of chitosan, then the photo-polymerization of DMAEM inside these beads. To assess the simultaneous basic and acidic dye removal efficacy (Safranine T; ST and Indigo carmine; IC) and characteristics, batch adsorption experiments were carried out. The effects of different parameters such as contact time, adsorbent dosage, initial dye concentration (25–400 ppm), and pH on the adsorption process were investigated. Under optimized conditions (adsorbent dosage, 1.5 g/L; pH, 3; initial concentration 250 ppm (125 ppm ST + 125 ppm IC), temperature, 25 °C), adsorption studies showed that the resin has significant high adsorption capacity (q_e = 126 and 130.5 mg/g for ST and IC, respectively). Adsorption isotherm studies showed that Langmuir, Langmuir–Freundlich, Redlich-Peterson, and D-R models fitted the adsorption equilibrium data quite well, while the Freundlich model gave poor fittings. Besides, for all initial dye concentrations in the range of 25–400 ppm in the binary mixture (except 12.5 ppm IC initial concentration), the process is favorable. According to adsorption model calculations, the adsorption takes place with a monolayer coverage, and the main dominant force for the system is weak interactions indicating physical adsorption. Kinetics studies showed that for both dye, the adsorption process could be expressed very well by the PFO model and PSO; however, the PFO model is somewhat better in predicting the experimental q_e values.

在这项研究中，新型的珠状IPN型树脂包含具有高染料吸附能力的聚（2-二甲基氨基乙基）甲基丙烯酸酯和羧甲基壳聚糖网络。吸附剂是通过一系列反应的组合来合成的，包括珠子的形成，交联和壳聚糖的羧甲基化，然后在这些珠子内部进行DMAEM的光聚合。为了评估同时去除碱性和酸性染料的功效（番红T，ST和靛蓝胭脂红； IC）和特性，进行了批量吸附实验。研究了诸如接触时间，吸附剂用量，初始染料浓度（25-400 ppm）和pH对吸附过程的不同参数的影响。在优化条件下（吸附剂量1.5 g / L; pH 3;初始浓度250 ppm（125 ppm ST + 125 ppm IC），温度25°C）， ST和IC分别为_e = 126和130.5 mg / g）。吸附等温线研究表明，Langmuir，Langmuir-Freundlich，Redlich-Peterson和DR模型非常适合吸附平衡数据，而Freundlich模型拟合较差。此外，对于二元混合物中所有初始染料浓度在25-400 ppm范围内（IC初始浓度12.5 ppm除外），该工艺是有利的。根据吸附模型计算，吸附以单层覆盖进行，系统的主要主导力是弱相互作用，表明存在物理吸附。动力学研究表明，对于两种染料，PFO模型和PSO都能很好地表达吸附过程。然而，PFO模式有些更好地预测实验q _Ë 价值观。