National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China; State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, No. 19, Xinjiekouwai Street, Beijing 100875, China.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, No. 19, Xinjiekouwai Street, Beijing 100875, China.
Sci Total Environ. 2019 Apr 20;662:1003-1011. doi: 10.1016/j.scitotenv.2019.01.312. Epub 2019 Jan 25.
In this study, carbon nanotube (CNT) and reduced graphene oxide (rGO) were studied for their potentials as novel adsorbents for trace concentrations of phosphorus and aluminum in water and wastewater. Static adsorption results demonstrated that CNT and rGO employed in this study removed up to 65.6% of total dissolved Al and 98.9% of P from a natural surface water and a secondary wastewater effluent. Hydrogen-bonding interactions between CNT/rGO and oxyanions were hypothesized to contribute to the adsorption process. Accordingly, acetaminophen (AAP), a pharmaceutical compound known to form hydrogen bonding with CNT, was spiked into the real water as a competitor for P and Al adsorption. Subsequent sorption results showed that the presence of AAP reduced Al and P adsorption by CNT and rGO by 9.3%-18.4% and 11.2%-18.2%, respectively. These results suggest that hydrogen bonding interactions with CNT/rGO influenced the adsorption of P and Al species. In addition, pH effect investigation on Al/P removal further verified the above opinion. Overall, this study provided important evidence and insights into CNT/rGO adsorption of P and Al species from water and wastewater, which expanded our understanding on the ability of carbonaceous nanomaterials for advanced water and wastewater treatment.
在这项研究中，研究了碳纳米管 (CNT) 和还原氧化石墨烯 (rGO) 作为新型吸附剂，用于去除水中和废水中痕量浓度的磷和铝。静态吸附结果表明，本研究中使用的 CNT 和 rGO 可去除天然地表水和二级废水处理厂中高达 65.6%的总溶解 Al 和 98.9%的 P。假设 CNT/rGO 与含氧阴离子之间的氢键相互作用有助于吸附过程。因此，将乙酰氨基酚 (AAP)（一种已知与 CNT 形成氢键的药物化合物）作为 P 和 Al 吸附的竞争物添加到实际水中。随后的吸附结果表明，AAP 的存在使 CNT 和 rGO 对 Al 和 P 的吸附分别减少了 9.3%-18.4%和 11.2%-18.2%。这些结果表明，与 CNT/rGO 的氢键相互作用影响了 P 和 Al 物种的吸附。此外，对 Al/P 去除的 pH 影响的研究进一步验证了上述观点。总体而言，这项研究为 CNT/rGO 从水中和废水中吸附 P 和 Al 物种提供了重要的证据和见解，扩展了我们对碳纳米材料在先进水处理中的能力的理解。
