Wang Junjie, Li Mingyu, Wei Gaoliang
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Key Laboratory of Groundwater Resources and Environment (Ministry of Education), College of New Energy and Environment, Jilin University, Changchun 130021, China.
Polymers (Basel). 2022 Jul 29;14(15):3068. doi: 10.3390/polym14153068.
A sulfophenyl-functionalized reduced graphene oxide (SrGO) membrane is prepared. The SrGO membranes have a high charge density in water and could provide many atomically smooth nanochannels, because of their strong ionized-SO3H groups and low oxygen content. Therefore, the SrGO membranes have an excellent performance in terms of high permeance and high rejection ability. The permeance of SrGO membranes could be up to 118.2 L m−2 h−1 bar−1, which is 7.6 times higher than that of GO membrane (15.5 L m−2 h−1 bar−1). Benefiting from their good electrical conductivity, the SrGO membranes could also function as an electrode and demonstrate a significantly increased rejection toward negatively charged molecules and positively charged heavy metal ions such as Cu2+, Cr3+ and Cd2+, if given an appropriate negative potential. The rejection ratios of these metal ions can be increased from <20% at 0 V to >99% at 2.0 V. This is attributed to the enhanced electrostatic repulsion between the SrGO membrane and the like-charged molecules, and the increased electrostatic adsorption and electrochemical reduction in these heavy metal ions on the membranes. This study is expected to contribute to efficient water treatment and the advance of graphene-based membranes.
制备了一种磺苯基功能化还原氧化石墨烯（SrGO）膜。SrGO膜在水中具有高电荷密度，由于其强电离的-SO3H基团和低氧含量，能够提供许多原子级光滑的纳米通道。因此，SrGO膜在高渗透率和高截留能力方面具有优异的性能。SrGO膜的渗透率可达118.2 L m−2 h−1 bar−1，比GO膜（15.5 L m−2 h−1 bar−1）高7.6倍。得益于其良好的导电性，SrGO膜还可以用作电极，并且如果施加适当的负电位，对带负电荷的分子和带正电荷的重金属离子（如Cu2+、Cr3+和Cd2+）的截留率会显著提高。这些金属离子的截留率可以从0 V时的<20%提高到2.0 V时的>99%。这归因于SrGO膜与带相同电荷分子之间增强的静电排斥作用，以及这些重金属离子在膜上增加的静电吸附和电化学还原作用。这项研究有望为高效水处理和基于石墨烯的膜的发展做出贡献。
