Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 4888 Shengbei Rd, Changchun, 130102, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 4888 Shengbei Rd, Changchun, 130102, China.
J Environ Manage. 2020 Feb 15;256:109943. doi: 10.1016/j.jenvman.2019.109943. Epub 2019 Dec 10.
Magnetic graphene oxide-titanate composites (MGO@TNs) were synthesized via growing titanate nanosheets on the graphene oxide sheets with magnetite nanoparticles anchored on. The as-prepared MGO@TNs showed a hierarchical structure and large specific surface area (193.4 m/g), which were suitable for rapid and effective adsorption of Pb(II) from wastewater. Moreover, the loaded magnetite nanoparticles guaranteed the effective magnetic separation of MGO@TNs, avoiding secondary pollution. The adsorption mechanism were illuminated to be ion exchange and surface complexation. Batch adsorption experiments showed the maximum adsorption capacity of MGO@TNs reached 322.7 mg/g for Pb(II) removal. The removal efficiency retained 89.6% after six adsorption-desorption cycles. In addition, the efficiency reached up to 99.8% when applying MGO@TNs for removal of Pb(II) from simulated realistic battery wastewater, ensuring the safe discharge of treated water. The good adsorption performance, recyclability and easy magnetic separation ability made sure that the MGO@TNs has great potential for purification of Pb(II) contaminated wastewater.
磁性氧化石墨烯-钛酸盐复合材料（MGO@TNs）是通过将钛酸盐纳米片生长在负载有磁铁矿纳米粒子的氧化石墨烯片上合成的。所制备的 MGO@TNs 呈现出分级结构和大的比表面积（193.4 m/g），适合于从废水中快速有效地吸附 Pb(II)。此外，负载的磁铁矿纳米粒子保证了 MGO@TNs 的有效磁分离，避免了二次污染。吸附机理被阐明为离子交换和表面络合。批处理吸附实验表明，MGO@TNs 对 Pb(II)的最大吸附容量达到 322.7 mg/g。经过六次吸附-解吸循环后，去除效率保持在 89.6%。此外，当 MGO@TNs 用于去除模拟实际电池废水中的 Pb(II)时，效率达到 99.8%，确保了处理后水的安全排放。良好的吸附性能、可回收性和易于磁分离能力确保了 MGO@TNs 在净化 Pb(II)污染废水中具有巨大的潜力。
