Used tea leaves, or tea waste (TW), were crushed into powder and mixed with graphene oxide (GO) in water, followed by adjusting the pH value of the resulting suspension with ammonia to 11, adding FeCl₂·4H₂O under magnetic stirring, filtration and drying to prepare a rGO/Fe₃O₄/TW (with mass ratios of 1:2:1) hybrid material. The structure and crystalline phases of the material were characterized by FTIR and XRD. Isotherms for uranium adsorption were obtained and its kinetics were measured in a conical bottle that was placed in a shaker. The effects of the pH value of the uranium solution, adsorption time and initial concentration on the uranium adsorption were investigated. Results indicate that the hybrid has a much faster adsorption rate than TW with a uranium removal rate up to nearly 100% in 20 min for an initial uranium concentration of 10 mg L⁻¹. The maximum adsorption capacity of the hybrid is 103.84 mg g⁻¹ while that of TW is 97.70 mg g⁻¹. The hybrid with adsorbed uranium can be easily separated from the solution by applying a magnetic field. The isotherms and kinetics of uranium adsorption on the hybrid are best fitted by the Langmuir isotherm model and the pseudo-second-order model, respectively. The hybrid has good reusability with an uranium removal rate of about 85% after 5 cycles.

用过的茶叶或茶渣（TW）粉碎成粉末，与氧化石墨烯（GO）在水中混合，然后用氨将所得悬浮液的pH值调节至11，在磁力作用下加入FeCl ₂ ·4H ₂ O搅拌、过滤和干燥以制备 rGO/Fe ₃ O ₄/TW（质量比为 1:2:1）混合材料。通过FTIR和XRD表征了材料的结构和晶相。获得了铀吸附的等温线，并在放置在振荡器中的锥形瓶中测量了其动力学。考察了铀溶液的pH值、吸附时间和初始浓度对铀吸附的影响。结果表明，对于 10 mg L ^-1的初始铀浓度，混合体具有比 TW 快得多的吸附速率，在 20 分钟内铀去除率高达近 100% 。杂化物的最大吸附容量为 103.84 mg g ^-1而 TW的最大吸附容量为 97.70 mg g ^-1. 通过施加磁场，可以很容易地将吸附有铀的混合物从溶液中分离出来。铀在混合体上的吸附等温线和动力学分别由 Langmuir 等温线模型和伪二级模型拟合得最好。该混合体具有良好的重复使用性，5次循环后铀去除率约为85%。