Chemistry Department, College of Science, Aljouf University, P.O. Box 2014, Sakaka, Aljouf, Saudi Arabia; Chemistry Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt.
Polymer Research Lab., Chemistry Department, Faculty of Science, Benisuef University, 62514 Benisuef, Egypt.
J Photochem Photobiol B. 2017 Aug;173:170-180. doi: 10.1016/j.jphotobiol.2017.05.044. Epub 2017 Jun 1.
This work provides a very infrequent and unique avenue of a novel bio-based nanografted polymeric composites achieving encouraging results in green management of dye contaminants in wastewater. A chitosan-grafted-polyN-Methylaniline (Ch-g-PNMANI) and chitosan-grafted-polyN-Methylaniline imprinted TiO nanocomposites (Ch-g-PNMANI/TiO) were prepared and efficiently applied in wastewater remediation. The nanocomposites were characterized by FT-IR spectroscopy, X-ray diffraction, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy and Brunauer-Emmett-Teller surface area (BET) measurements. The prepared composites exhibit higher adsorptivity in removing remazol red RB-133 (RR RB-133) dye compared to other adsorbents reported in literature. The effects of TiO loadings, initial dye concentration, contact time, and pH on dye adsorption were investigated. The maximum adsorption of dye was found at low pH values. Furthermore, Ch-g-PNMANI/TiO of the optimum TiO loading has higher adsorption capacity (116.3mg/g) than the pristine Ch-g-PNMANI (108.7mg/g). Moreover, the prepared adsorbents are photoactive under sunlight-irradiation. The study addresses a nanocomposite of considerable adsorption and in the same time has the fastest self-cleaning photoactivity (t=31.5min.) under sunlight irradiation where a plausible photodegradation mechanism was proposed. Interestingly, the presented photoactive adsorbents are still effective in removing dye after five adsorption/sunlight-assisted self-cleaning photoregeneration cycles and therefore, they can be potentially applied to the rapid, "green" and low-cost remediation of RR RB-133 enriched industrial printing and dyeing wastewater.
这项工作提供了一种非常罕见且独特的途径，即用新型生物基纳米接枝聚合物复合材料来实现对废水中染料污染物的绿色管理，从而取得令人鼓舞的结果。制备了壳聚糖接枝聚 N-甲基苯胺（Ch-g-PNMANI）和壳聚糖接枝聚 N-甲基苯胺印迹 TiO2纳米复合材料（Ch-g-PNMANI/TiO2），并将其有效地应用于废水修复。通过傅里叶变换红外光谱、X 射线衍射、透射电子显微镜、紫外-可见漫反射光谱和 Brunauer-Emmett-Teller 比表面积（BET）测量对纳米复合材料进行了表征。与文献中报道的其他吸附剂相比，所制备的复合材料在去除雷马唑红 RB-133（RR RB-133）染料方面表现出更高的吸附能力。研究了 TiO2负载量、初始染料浓度、接触时间和 pH 值对染料吸附的影响。发现染料的最大吸附发生在低 pH 值下。此外，具有最佳 TiO2负载量的 Ch-g-PNMANI/TiO2具有比原始 Ch-g-PNMANI（108.7mg/g）更高的吸附容量（116.3mg/g）。此外，所制备的吸附剂在阳光照射下具有光活性。该研究提出了一种具有相当吸附能力的纳米复合材料，同时具有最快的自清洁光活性（t=31.5min.），在阳光照射下提出了一种合理的光降解机制。有趣的是，在经过五次吸附/阳光辅助自清洁光再生循环后，所提出的光活性吸附剂仍能有效地去除染料，因此它们可潜在应用于 RR RB-133 富集的工业印花和染色废水的快速、“绿色”和低成本修复。
