Department of Chemistry, Dr B R Ambedkar National Institute of Technology, Jalandhar, 144 011, India.
Department of Chemistry, Dr B R Ambedkar National Institute of Technology, Jalandhar, 144 011, India.
J Environ Manage. 2019 Feb 1;231:380-390. doi: 10.1016/j.jenvman.2018.10.038. Epub 2018 Oct 24.
The present research work reveals semi-interpenetrating network (semi-IPN) synthesis using response surface methodology-central composite design (RSM-CCD) based optimization. The maximum swelling of 362.11% was obtained with monomer, crosslinker and initiator concentrations 4.39 mol L, 1.52 mol L and 4.58 mol L, respectively, temperature 70 °C, time 3 h and pH 4.0. The synthesized hydrogel showed 94.16% and 95.62% removal for eosin yellow (EY) and eriochrome black-T (EBT) dyes, respectively. The incorporation of cadmium sulphide nanodots into the hydrogel network enhanced the % dye removal (96.82% EY and 98.73% EBT) along with fluorescent behavior. Various conditions optimized for EY and EBT dye removal with respect to semi-IPN were: 0.4 g adsorbent dose each, dye concentrations 10 mg L and 120 mg L, contact time 24 h each, respectively. Adsorption studies followed langmuir theory for both dyes. Second order and first order kinetics along with intraparticle diffusion of dye molecules were favorable to EY and EBT, respectively. Thermodynamic study reveals exothermic nature of adsorption. Recyclability of the adsorbent is superior as tested by desorption-adsorption tests.
本研究工作揭示了使用响应面法-中心复合设计（RSM-CCD）基于优化的半互穿网络（semi-IPN）合成。在单体、交联剂和引发剂浓度分别为 4.39mol/L、1.52mol/L 和 4.58mol/L、温度为 70°C、时间为 3h 和 pH 值为 4.0 的条件下，得到了最大溶胀度为 362.11%的水凝胶。所合成的水凝胶对曙黄（EY）和铬黑 T（EBT）染料的去除率分别为 94.16%和 95.62%。纳米硫化镉的加入增强了水凝胶网络的荧光性能，同时提高了染料去除率（EY 为 96.82%，EBT 为 98.73%）。针对半互穿网络优化了 EY 和 EBT 染料去除的各种条件为：吸附剂用量各为 0.4g，染料浓度各为 10mg/L 和 120mg/L，接触时间各为 24h。两种染料的吸附研究均符合朗缪尔理论。对于 EY 和 EBT，二级和一级动力学以及染料分子的内扩散都有利于吸附。热力学研究表明吸附是放热的。通过解吸-吸附试验测试，证明了吸附剂的可回收性良好。
