Abd-Rabboh Hisham S M, Kamel Ayman H
Chemistry Department, College of Science, King Khalid University Abha 62223 Saudi Arabia.
Chemistry Department, Faculty of Science, Ain Shams University PO Box 11655 Cairo Egypt
RSC Adv. 2024 Oct 7;14(43):31683-31693. doi: 10.1039/d4ra03720k. eCollection 2024 Oct 1.
To remove organic and inorganic agrochemicals from contaminated soil and water, adsorption has been regarded as a viable remediation approach. For the removal of organic pollutants, such as pesticides, cost-effective adsorbents have garnered a lot of interest. These include waste-derived materials, clay composites, metal-organic frameworks (MOFs), nanocomposites, and biochar-modified materials. In this study, copper ferrite (CuFeO) was prepared, characterized, and modified with aminated reduced graphene oxide (Am-rGO) to form a CuFeO/Am-rGO nanocomposite for the effective removal of imidacloprid (IMD) from water. The Langmuir isotherm model was used to determine the maximum adsorption capacity of the adsorbent (CuFeO/Am-rGO), which was estimated to be 13.1 (±1.5) mg g. At 0.5 mg L IMD, the adsorbents were able to extract up to 97.8% of the IMD from the aqueous solution. The Freundlich model and the pseudo second-order model agreed well with the experimental data, proving that physisorption and chemosorption both played a role in the sorption process. CuFeO/Am-rGO nanocomposite offers high stability and improved reusability due to its improved removal efficiency. After five adsorption-desorption cycles, there was no appreciable reduction in elimination. Additionally, after adsorption tests, IMD can be easily removed after adsorption by an external magnetic field. These showed that Am-rGO had changed the surface of CuFeO to make it easier for IMD to stick to it in aqueous solutions. When used adsorbent is co-processed with ethanol extraction and ultrasound cavitation, it can be regenerated and still work well as an adsorbent. Furthermore, CuFeO/Am-rGO demonstrated its environmental safety and ability to continue absorbing IMD across a variety of diverse matrices. As a result, this study demonstrates that CuFeO/Am-rGO is a long-lasting, easily prepared, and efficient adsorbent for the removal of IMD as one of the neonicotinoids.
为了从受污染的土壤和水中去除有机和无机农用化学品，吸附被视为一种可行的修复方法。对于去除有机污染物，如农药，具有成本效益的吸附剂引起了广泛关注。这些吸附剂包括废物衍生材料、粘土复合材料、金属有机框架（MOF）、纳米复合材料和生物炭改性材料。在本研究中，制备了铜铁氧体（CuFeO），对其进行了表征，并用胺化还原氧化石墨烯（Am-rGO）对其进行改性，以形成用于从水中有效去除吡虫啉（IMD）的CuFeO/Am-rGO纳米复合材料。使用朗缪尔等温线模型确定吸附剂（CuFeO/Am-rGO）的最大吸附容量，估计为13.1（±1.5）mg/g。在0.5mg/L的IMD浓度下，吸附剂能够从水溶液中提取高达97.8%的IMD。弗伦德里希模型和伪二级模型与实验数据吻合良好，证明物理吸附和化学吸附在吸附过程中均起作用。由于其提高的去除效率，CuFeO/Am-rGO纳米复合材料具有高稳定性和更好的可重复使用性。经过五个吸附-解吸循环后，去除率没有明显降低。此外，在吸附试验后，通过外部磁场可以很容易地在吸附后去除IMD。这些结果表明，Am-rGO改变了CuFeO的表面，使其在水溶液中更容易让IMD附着。当使用过的吸附剂与乙醇萃取和超声空化共同处理时，它可以再生并且仍然作为吸附剂表现良好。此外，CuFeO/Am-rGO证明了其环境安全性以及在各种不同基质中持续吸附IMD的能力。因此，本研究表明，CuFeO/Am-rGO是一种持久、易于制备且高效的吸附剂，可用于去除作为新烟碱类之一的IMD。
