Department of Chemistry, Presidency University, Bengaluru, Karnataka, 560064, India.
Environ Sci Pollut Res Int. 2021 Mar;28(10):12011-12025. doi: 10.1007/s11356-020-08820-2. Epub 2020 Apr 25.
The present study explored an efficient technoeconomic method for treating intensely colored dyeing effluents from a commercial source. Firstly, the adsorption efficacy of jute fiber (JF) was enhanced through grafting with tannin, a natural polyphenol, via incorporation of active epoxy groups by epichlorohydrin onto fiber surface. The effect of different experimental parameters (e.g., initial pH, adsorbent dose, temperature, and contact time) on extent of color removal was evaluated performing batch studies. A full factorial central composite design (CCD) in response surface methodology (RSM) was applied to optimize the decolorization process for achieving maximum color removal (99.5%) at pH 4.9, adsorbent dose 11.8 g/L, temperature 30 °C, and time of contact 117.8 min. The isotherm and kinetic studies of the process revealed that Langmuir model and pseudo-second-order model provided best fit, yielding high correlation coefficients (R > 0.997). Significant desorption (76%) of the spent adsorbent by 0.1 M NaOH solution suggested that this tannin-modified JF can find a prospective practical application as a novel, inexpensive, and potential bioadsorbent to treat the dyeing effluent.
本研究探索了一种从商业来源处理高浓度染色废水的高效技术经济方法。首先，通过将活性环氧基团通过表氯醇接枝到纤维表面，使黄麻纤维（JF）与单宁（一种天然多酚）接枝，从而增强了吸附效果。通过批次实验评估了不同实验参数（例如初始 pH 值、吸附剂剂量、温度和接触时间）对去除颜色效果的影响。在响应面法（RSM）中应用全因子中心复合设计（CCD）来优化脱色过程，以在 pH 值为 4.9、吸附剂剂量为 11.8 g/L、温度为 30°C 和接触时间为 117.8 min 的条件下实现最大的颜色去除率（99.5%）。该过程的等温线和动力学研究表明，Langmuir 模型和拟二级模型提供了最佳拟合，得到了高相关系数（R>0.997）。通过 0.1 M NaOH 溶液对用过的吸附剂进行了显著的解吸（76%），表明这种经过单宁改性的 JF 可以作为一种新型、廉价且有潜力的生物吸附剂，用于处理染色废水。
