Preparation of a magnetic reduced-graphene oxide/tea waste composite for high-efficiency sorption of uranium

Abstract

The preparation and application of adsorptive materials with low cost and high-efficiency recovery of uranium from nuclear waste is necessary for the development of sustainable, clean energy resources and to avoid nuclear pollution. In this work, the capacity of tea waste and tea waste hybrids as inexpensive sorbents for uranium removal from water solutions was investigated. Composites of graphene oxide (GO) and tea waste (TW) exhibited a promising adsorption performance for uranium from aqueous solutions. The composites GOTW and magnetic rGO/Fe 3 O 4 /TW show high adsorption capacities ( Q m (TW) = 91.72 mg/g, Q m (GOTW) = 111.61 mg/g and Q m (rGO/Fe3O4/TW) = 104.95 mg/g) and removal rates (~99%) for U(VI). The equilibrium sorption of the adsorbents fitted well to the Langmuir model, and the sorption rate fitted well to a pseudo-second-order kinetic model. The thermodynamic parameters indicated that sorption was spontaneous and favourable. The prepared adsorbents were used for the removal of uranium from real water samples as well. The results revealed that GOTW and rGO/Fe 3 O 4 /TW can be used to remediate nuclear industrial effluent as a potential adsorbent.

Hazardous wastes treatment technologies

“…The abundant O‐H and MnO 2 nanoparticles facilitated U(VI) adsorption by coordination and Lewis acid–base interaction. Yang, Zhu, Li, Zhu, Li, and Huang (2019) studied the adsorption of uranium, U(VI), on magnetic reduced graphene oxide (GO) and tea waste (TW) composite. GOTW and magnetic rGO/Fe 3 O 4 /TW exhibited significant U(VI) adsorption capacity with capability to remove 99% of U(VI).…”

Surface Modification of Tea-Waste-Based Biochar Adsorbent: Synthesis, Characterization, and Batch Adsorption for the Removal of Zidovudine ARV Drug and Phenol

“…However, the methods of modification in previous studies were not in line with green chemistry guidelines. These studies used harsh, toxic, and large quantities of chemicals to synthesize materials such as GO and rGO [18,19]. Furthermore, it is important to note that the current study used methods and chemicals that comply with green chemistry principles.…”

Fabrication of Polyaniline/Graphene Oxide Nanosheet@ Tea Waste Granules Adsorbent for Groundwater Purification

“…The use of tea waste (TW) is recommended as immobilizing support for the GO sheets due to its abundance, ease of handling, and low cost. Moreover, tea waste itself can work as an adsorbent for the removal of Br − due to the presence of functional groups related to its cellulosic or phenolic and flavonoid constituents [ 21 ]. The application of tea waste-based adsorbents is already widely explored for the removal of multiple pollutants.…”

“…Hassan et al [ 22 ] have written a brief review of the application of the TW-based adsorbent. In recent years, TW-based composite adsorbents such as SiO 2 @TW [ 23 ], rGO/Fe 3 O 4 /TW [ 21 ], Polypyrrole/Magnetic/Tea Waste [ 24 ] etc. have been developed for the elimination of diverse pollutants.…”