Institute of Nanoscience & Nanotechnology, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt.
Environ Sci Pollut Res Int. 2020 Sep;27(26):33020-33031. doi: 10.1007/s11356-020-09341-8. Epub 2020 Jun 11.
Dinitrosalicylic acid-functionalized chitosan, CHN-DNSA, was developed and improved the adsorption property against chromium Cr(VI) and/or Rhodamine B (RHB). Here, the disposal of wastewater bearing Cr(VI) and RHB from a complex system was ascribed to significant differences in physicochemical properties. The constructed CHN-DNSA surface charge is responsible for different interactions enabling simultaneous capture of pollutants. The excellent adsorption potency of Cr(VI) at pH 3.0 was 98.4% within a remarkable 1 h and the adsorption performance was 91.1% for RHB. The ionic strength was affected, reducing the removal % of Cr(VI) to 36.7% whereas 0.1 M NaCl meliorated the removal efficiency from 91.6 to 96.2% for RHB and from 82.3 to 89.1% for a binary system. Also, the exploited elimination process of Cr(VI) and/or RHB obeyed the 2nd model of kinetics and the Freundlich system. Good recovery, superior capacity, and synthetic approach make this protocol promising for wastewater treatment.
制备了一种对六价铬（Cr(VI)）和/或罗丹明 B（RHB）具有吸附性能的二硝水杨酸功能化壳聚糖（CHN-DNSA）。在该体系中，由于废水中 Cr(VI)和 RHB 的物理化学性质存在显著差异，因此采用了不同的处理方法。构建的 CHN-DNSA 表面电荷可以进行不同的相互作用，从而实现同时捕获污染物。在 pH 值为 3.0 时，CHN-DNSA 对 Cr(VI)的吸附能力在 1 小时内达到 98.4%，对 RHB 的吸附性能达到 91.1%。离子强度会影响去除率，将 Cr(VI)的去除率降低至 36.7%，而 0.1 M NaCl 可将 RHB 的去除效率从 91.6%提高至 96.2%，将二元体系的去除效率从 82.3%提高至 89.1%。此外，Cr(VI)和/或 RHB 的去除过程符合二级动力学模型和 Freundlich 体系。该方法具有良好的回收率、高容量和合成方法，有望用于废水处理。
