Ma Ming, Deng Hao, Ren Zhenyu, Zhong Xin
School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Nov;29(52):78989-79001. doi: 10.1007/s11356-022-21351-2. Epub 2022 Jun 15.
In recent years, the synthesis and application of green, cost-effective, and sustainable materials for uranium (VI) removal was significant to environmental protection. The ordered mesoporous carbon (CMK-3) supported different mass of hydroxyapatite materials (HAP@CMK-3) were facilely synthesized via hydrothermal method. The resultant materials were characterized by XRD, FT-IR, BET, SEM, TEM mapping, and XPS, and implemented for immobilizing U(VI). Not only the specific surface area of HAP (7.01 m/g) was increased by the loading on CMK-3 (818.37 m/g), but also the adsorption capacity of CMK-3 was increased by HAP modification. Impressively, HAP@CMK-3 exhibited highly adsorption capacity of U(VI) with the increase of HAP deposition and was capable of achieving fast reaction. Therein to, the specific surface area of HAP@CMK-3(2:1) was 253.68 m/g, as well as the adsorption capacity was up to 1072 mg/g (fitted by Langmuir isotherm, at pH=3.0, 298 K) and the adsorption process was completed in 30 min (followed by pseudo-second-order kinetic). The adsorption mechanisms of U(VI) on HAP@CMK-3 involved electrostatic forces, ionic interactions, and chemical complexation. This work offered new avenues to address the limitations of cost and less secondary pollution for the removal of U(IV) from wastewater.
近年来，合成绿色、经济高效且可持续的铀（VI）去除材料对环境保护具有重要意义。通过水热法轻松合成了负载不同质量羟基磷灰石材料（HAP@CMK-3）的有序介孔碳（CMK-3）。通过XRD、FT-IR、BET、SEM、TEM图谱和XPS对所得材料进行了表征，并用于固定U（VI）。HAP负载在CMK-3上后，不仅使HAP的比表面积（7.01 m²/g）增加到CMK-3的比表面积（818.37 m²/g），而且HAP改性还提高了CMK-3的吸附容量。令人印象深刻的是，随着HAP沉积量的增加，HAP@CMK-3对U（VI）表现出高吸附容量，并且能够实现快速反应。其中，HAP@CMK-3（2:1）的比表面积为253.68 m²/g，吸附容量高达1072 mg/g（根据Langmuir等温线拟合，在pH = 3.0、298 K条件下），吸附过程在30分钟内完成（符合准二级动力学）。U（VI）在HAP@CMK-3上的吸附机制涉及静电力、离子相互作用和化学络合。这项工作为解决从废水中去除U（IV）时成本高和二次污染少的局限性提供了新途径。
