Bio/Polymer Research Laboratory, Department of Chemistry, Jamia Millia Islamia University, New Delhi 110025, India.
School of Interdisciplinary Research, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Sci Total Environ. 2022 Nov 10;846:157154. doi: 10.1016/j.scitotenv.2022.157154. Epub 2022 Jul 5.
This work reports the successful functionalization of l-proline on the surface of superparamagnetic iron oxide nanoparticles (SPION) synthesized via a simple, cost-effective hydrothermal method. Moreover, the chemical attachment of Cu/Cu nanoparticles on the surface of SPION@l-proline was done by an in-situ deposition method. The developed nano-photocatalyst was characterized in detail by XRD, FT-IR, XPS, FE-SEM, TEM, EDX, BET, TGA, and VSM. XRD of SPION@l-proline-Cu reveals peaks of both SPION and copper nanoparticles which confirms the formation of nanophotocatalyst. TGA demonstrates a major weight loss between 250 and 310 °C due to l-proline which ensures the successful immobilization of SPION on the surface of l-proline. The band energy at 932 eV suggests a complete reduction of Cu ion to Cu metal on the surface of SPION@l-proline nanocomposite as confirmed by the XPS technique. Under UV light irradiation, the photocatalytic reduction performance of the developed Cu metal ion-based and Cu nanoparticle-based magnetic nano-photocatalysts was demonstrated and compared for the first time for the photocatalytic reduction of 4-NP, 4-NA, NB, MO, MB, and CR. The results show that Cu-based magnetic nanophotocatalyst has slightly enhanced catalytic activity. Furthermore, solar-driven photocatalytic degradation of CR azo dye by synthesized nano-photocatalyst was also investigated, with a 95 % degradation efficiency in just 40 min. The developed magnetic nano-photocatalyst can easily be separated by using an external magnet due to the superparamagnetic nature of core material (SPION) at room temperature as confirmed from VSM and can be reused for multiple cycles without losing considerable catalytic activity. Because of its high photocatalytic efficiency, cost-effectiveness, good magnetic separation performance, non-toxicity, and strong thermal and chemical stabilities, Cu/Cu-based magnetic nano-photocatalyst has potential application in wastewater treatment.
这项工作报道了通过一种简单、经济有效的水热法成功地将 L-脯氨酸功能化到超顺磁性氧化铁纳米粒子（SPION）的表面上。此外，还通过原位沉积法将 Cu/Cu 纳米粒子化学附着在 SPION@L-脯氨酸的表面上。所开发的纳米光催化剂通过 XRD、FT-IR、XPS、FE-SEM、TEM、EDX、BET、TGA 和 VSM 进行了详细的表征。SPION@L-脯氨酸-Cu 的 XRD 显示出 SPION 和铜纳米粒子的峰，这证实了纳米光催化剂的形成。TGA 表明由于 L-脯氨酸在 250 到 310°C 之间存在主要的重量损失，这确保了 SPION 成功地固定在 L-脯氨酸的表面上。在 XPS 技术的证实下，位于 932 eV 的能带能量表明 SPION@L-脯氨酸纳米复合材料表面上的 Cu 离子完全还原为 Cu 金属。在紫外光照射下，首次展示并比较了开发的基于 Cu 金属离子和 Cu 纳米粒子的磁性纳米光催化剂对 4-NP、4-NA、NB、MO、MB 和 CR 的光催化还原性能。结果表明，基于 Cu 的磁性纳米光催化剂具有略微增强的催化活性。此外，还研究了合成的纳米光催化剂对 CR 偶氮染料的太阳能驱动光催化降解，仅在 40 分钟内就达到了 95%的降解效率。由于核心材料（SPION）的超顺磁性，所开发的磁性纳米光催化剂在室温下可以很容易地通过使用外部磁铁进行分离，并且可以在不失去相当的催化活性的情况下重复使用多次循环。由于其高的光催化效率、成本效益、良好的磁性分离性能、无毒、强热和化学稳定性，Cu/Cu 基磁性纳米光催化剂在废水处理方面具有潜在的应用。
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