Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah, 21589, Saudi Arabia.
Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah, 21589, Saudi Arabia; Center of Excellence for Advanced Materials Research, King Abdulaziz University, P. O. Box 80203, Jeddah, 21589, Saudi Arabia.
Chemosphere. 2022 Mar;291(Pt 3):133010. doi: 10.1016/j.chemosphere.2021.133010. Epub 2021 Nov 20.
In the area of water pollution treatment, the coupling of biopolymers with metal/metal nanoparticles is getting a lot of interest these days. Herein, carboxymethyl cellulose (CMC) beads and chitosan (Cs) coated CMC beads were employed as a support for copper nanoparticles, (Cu/CMC) and (Cu/Cs@CMC), respectively. Following that, a reducing agent (NaBH) was used to convert Cu/CMC and Cu/Cs@CMC beads to zero valent. The developed beads were employed for catalytic reductions of nitrophenol, dyes, and potassium hexacyanoferrate (III) in their mixed solution with NaBH. Cu/Cs@CMC beads were more efficient compared to Cu/CMC beads toward selected pollutants. The reduction rate constants of 4-NP, MO, EY and K[Fe(CN)] by utilizing Cu/Cs@CMC were 3.8 × 10, 4.0 × 10, 1.4 × 10 and 4.48 × 10 min, respectively. Further, the catalytic activity of the Cu/Cs@CMC beads were optimized using 4-NP as a model compound for this study. Cu/Cs@CMC beads were able to use up to three cycles compared to Cu/CMC beads without losing catalytic activity in the reduction of 4-NP, according to the recyclability and reusability study of both beads. The chitosan coating beads Cu/Cs@CMC was simply prepared and have good catalytic activity, recyclable, and more efficient than Cu/CMC beads due to their high strength and stability.
在水污染处理领域，生物聚合物与金属/金属纳米粒子的偶联近年来引起了广泛关注。在此，羧甲基纤维素（CMC）珠和壳聚糖（Cs）包覆的 CMC 珠分别被用作铜纳米粒子（Cu/CMC）和（Cu/Cs@CMC）的载体。随后，使用还原剂（NaBH）将 Cu/CMC 和 Cu/Cs@CMC 珠还原为零价。所开发的珠用于催化还原混合溶液中的硝苯酚、染料和六氰合铁（III）酸钾与 NaBH。与 Cu/CMC 珠相比，Cu/Cs@CMC 珠对选定的污染物更有效。利用 Cu/Cs@CMC 还原 4-NP、MO、EY 和 K[Fe(CN)]的速率常数分别为 3.8×10、4.0×10、1.4×10 和 4.48×10 min。此外，根据两种珠的可循环使用和再使用研究，使用 4-NP 作为模型化合物对 Cu/Cs@CMC 珠的催化活性进行了优化。与 Cu/CMC 珠相比，Cu/Cs@CMC 珠在还原 4-NP 时能够使用多达三个循环，而不会失去催化活性。由于其高强度和稳定性，壳聚糖包覆珠 Cu/Cs@CMC 制备简单，催化活性好，可循环使用，比 Cu/CMC 珠更有效。
